Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T7250-94
Drying Technology
Published on July 18, 1994
Implementation on July 1, 1995
Ministry of Machinery Industry of the People's Republic of China
Subject Content and Scope of Application
2 General Terms
3 Drying Process
4 Technical and Economic Indicators
5 Drying Equipment
Appendix A Chinese Name Index (Reference)
English Name Index (Reference)
Appendix B Yellow
Mechanical Industry Standard of the People's Republic of China
Drying Technology Terminology
1 Subject Content and Scope of Application
This standard specifies the relevant terms related to drying technology. This standard applies to the production, scientific research, teaching and application of drying technology and drying equipment. 2 General terms
2.1 Drying
It refers to the process of vaporizing and removing the condensate (water or other solvent) contained in the material. In industrial production, it refers to the process of removing the condensate contained in certain raw materials or finished products processed with these raw materials. 2.2 Heat-drying
JB/T 7250-94
The process of using heat energy to heat the material, vaporize and remove the moisture in the material, so as to reduce the moisture in the material. 2.3 Materials
The material before, during and after drying is the material defined in this standard, which can be solid or liquid (juice or animal form).
2.3.1 Fresh material (original material) Material to be dried is the material prepared for the drying process.
2.3.2 Dried material (dried finished product) Dried material The material after drying.
2.3.2.1 Content of dry matter Content of dry matter The quotient obtained by dividing the mass of dry matter by the mass of fresh matter. The determination method should be given when stating the content of dry matter. Absolute dry material 2.3.3
Material that does not contain condensed fractions, the mass of which is the difference between the mass of the material and the mass of the contained visible fractions. 2.3.3.1 The content of absolute dry material The quotient obtained by dividing the mass of absolute dry material by the total mass of the material. The determination method should be given when stating the content of absolute dry material. 2.3.4 Loss of drying (loss of dry material) The part of the material lost during the drying or freezing process (for example, loss caused by fly ash, abrasion, and deposition). 2.3.5 Fly ash lift off (particles) The small particulate material that falls off and is removed from the material during the coal or freezing process. 2.3.65
Desorption of material The phenomenon that the material releases water into the atmosphere.
Desorption isotherm of material2.3.7
At constant temperature, when the material releases moisture into the atmosphere, the curve representing the relationship between different relative humidity of the atmosphere and the material balance moisture2.3.8 Moisture absorption of material
moiston of material
Approved by the Ministry of Machinery Industry on 1994-07-18
Implemented on 1995-07-01
The phenomenon that the material absorbs moisture in the atmosphere. JB/T 7250-94
Adsorption isotherm of material2.3.9:
At constant temperature, when the material absorbs moisture from the atmosphere, the curve representing the relationship between different relative humidity of the atmosphere and the material balance moisture. Hygroscopic hysteresis of material2.3.10
At constant temperature, the phenomenon that the adsorption isotherm and desorption isotherm of the material have significant differences. Thermal capacity of material2.3.11
The amount of heat required or released to raise or lower the temperature of 1 kg of material by 1°C, kJ/(kg·°C). 2.3.12 Volumetric thermal capacity of materialThe product of the thermal capacity of a material and its bulk density, kJ/(m,C). Coefficient of heat conductivity of material2.3.13
When the temperature difference between the upper and lower layers of a 1 m thick material layer is 1°C, the amount of heat that passes through an area of 1 m\ of the material layer within 1 hour, kJ/(m.hC)
Coefficient of temperature conductivity of material2.3.14
The ratio of the thermal conductivity of a material to its volumetric heat capacity, m*/h. 2.3.15
Thermal stability of meterial material The ability of the main components of the material to remain unchanged during the heating process. 2.3.16 Permissible heated temperature of material The highest temperature at which the material is heated without damaging the properties of the material. 2.3.17 Encosure of dried matter The dried material that surrounds the ice nucleus (see 2.4.3) and contains bound water (see 2.4.2) during the freeze-drying process. 2.4 Moisture; humidity
The moisture or solvent in this part of the material (i.e., wet material) that exists as free solvent and/or chemical solvent. The moisture in the material is expressed as moisture content or humidity.
2.4.1 Free moisture
The moisture that can be removed by heat of sublimation and evaporation. For moisture, it is a general term for free water and capillary water. 2.4.1.1 Free water
Water existing in the fine brain of material particles. 2.4.1.2 Capillary water capillary water water existing in the capillaries of material particles. coarse capillary water 2.4.1.3
Water existing in the capillary when the diameter is greater than 10-1cm. microcapillary water microcapillary water 2.4.1.4
Water existing in the capillary when the diameter is less than 10-cm. bound moisture 2.4.2
Moisture that requires additional energy to remove in addition to the heat of sublimation and evaporation, such as: product water, structural water, adsorbed water, etc. Water of crystallization (crystal water) 2.4.2.1
The water in the composition of crystal hydrate exists in the crystal lattice in the form of molecules. It belongs to chemically bound water. In the chemical formula, it is attached to other components in the form of whole molecules. When this water decomposes, the material structure must be severely destroyed. Therefore, the dehydration process of crystal water is generally not regarded as a drying process.
Physical chemistry combined water physical chemistry combine water 2.4.2.2
adsorbed water
Water adsorbed by the molecular force field on the internal and external surfaces of the material: permeable water
JB/T7250-94
During the combination with the material, due to the difference in the concentration of the dissolved substances on the internal and external surfaces of the material tissue wall, the water diffuses through the wall membrane to form condensation.
c.Bound water structured water
Water that exists in the cells of the material and is firmly bound to the hydrocolloids such as starch and protein. 2.4.3 Ice core
The water that is mainly surrounded by the shell of the dry material (see 2.3.17) in the solid aggregate state. 2.4.4 Moisture content moisture content
The quotient obtained by dividing the wet content by the material amount.
The determination method should be given when stating the moisture content. 2.4.4.1 Wet base moisture content (w) wet base moisture content The concentration expression method based on the wet material, that is: the mass of the visible part in the visible material (W) × 100% =
The total mass of the wet material (g)
2.4.4.2 Dry base moisture content w
dry base moisture content
Concentration expression based on absolute dry material, i.e.; the mass of moisture in wet material (W) × 100%
Total mass of wet material (g)
initial moisture content2.4.4.3
The moisture content of fresh material (original material). Final moisture contentfinal residual moisture2.4.4.4
The moisture content of the material coming out of the dryer.
Range of material moisture released2.4.4.5
The difference in moisture content before and after drying.
2.4.4.6 Moisture equilibrium of materialMoisture equilibrium of materialAfter mixing materials with different moisture contents, after a certain period of time, the moisture content of the material tends to equilibrium. 2.4.5 Degree of moisture; degree of humidity The quotient of the moisture content of the material (see 2.4.4.3) divided by the absolute dry material content (see 2.3.3). The determination method must be given when explaining the degree of mixing. 2.5 Desiccant (drying medium) Drying medium is a substance that can remove moisture from wet materials. Air is mostly used as a desiccant (drying medium) in drying operations. 2.5.1 Chemical desiccant The process of removing moisture through chemical reactions, such as aluminum oxide, concentrated sulfuric acid, phosphorus pentoxide, etc. Physical desiccant
Substances that can absorb moisture or form a constant boiling mixture with moisture without chemical reactions, such as silicic acid (used to remove moisture from the air) and benzene (used to remove moisture from alcohol). 2.6 Dry air
Air that does not contain water vapor.
Wet air moistair
Air containing water vapor
2.8Cooling gas coolinggas
Gas used to cool materials.
2.9Exhaustair
Gas discharged after the drying medium and the material have exchanged moisture and heat. 3
2.10Calorific value calorificvalue
JB/T725094
In fuel chemistry, it refers to the heat released when a unit weight (or volume) of fuel is completely burned. In food chemistry, it refers to the heat released when 1g of food is oxidized in the body. Calorific capacity offuel2.11
The heat released when 1kg of olefin is completely burned.
2.11.1 High calorific capacity of coal High calorific capacity of coal The maximum calorific capacity of 1 kg of coal after combustionbzxz.net
2.11.2 Low calorific capacity of coal Low calorific capacity of coal After coal is burned, the actual heat released is based on the latent heat of vaporization of water vapor generated by it. Heat balance calculation 2.12
Calculation of heat balance based on the law of conservation of energy. 2.13
Standard coal standard coal
Coal that can release 29308 kJ of low calorific value per gram (see 2.11.2). 2.14 Flue gas fluegas
Gases generated after fuel is burned in the stove. 2.15 Material temperature during drying process
Material heating temperature temperature of heated material 2.15.1
The temperature reached by the material after absorbing heat during the drying process. 2.15.2
Temperature of material before entering the dryer.
Temperature of material after drying leaving drying section. 2.15.3
Temperature of material when leaving the drying section.
2.15.4Drying temperaturetemperatureof thematerialbeingdricdTemperature of thematerialbeingdricdTemperature of thematerialbeingdricd during the drying process measured at a specified position. The measuring method and measuring position shall be given, and the upper limit temperature of the drying material shall be noted. 2.15.5Temperature curveTemperature curve of the material temperature and time during the drying process. 2.16Drying process
A function of the area-dependent dehumidification rate, which depends on: a.
The humidity of the material:
b. The time interval since the start of drying.
Drying timedrying time
The time it takes to dry the material from a certain initial moisture content to a specified final moisture content. Length of slay (in the drying chamber) 2.16.2
The time the material stays in the dryer.
Cycle time
The time the material stays in the continuous working dryer. Heatup time of material2.16.4
The time the drying medium is in contact with the material.
Tempering
The process of storing the dried material for a period of time to allow heat and moisture exchange between particles or within the material to make its humidity uniform. Meterial drying curve
Material drying curve
The curve of the change of material moisture content with drying time. 4
2.16.7 Cooling
The process of cooling the material after drying.
JB/T7250-94
2.16.7.1 Counterflow cooling counterflow cooling (see 2.8) Cooling in the opposite direction of the material flow. Crossflow cooling (crossflow cooling) crosslow cooling 2.16.7.2
Cooling in the direction of perpendicularity of the cooling gas to the material flow. 2.17 Drying conditions and drying principles
2.17.1 Drying conditions drying condition The general term for various parameters in the drying process. 2.17.2 Heating temperature heating temperature The temperature of the heater.
2.17.3 Material layer resistance material obstruction Pressure loss when the airflow passes through the material layer. 2.17.4Material thicknessThe shortest distance that the explosive medium passes through the material to become waste gas. Thickness of the material2.17.5
The thickness of the material during the drying process or the height of the pile of granular materials in freeze drying. 2.17.6Mass transfer
Abbreviation for material transfer. The mass migration process of a material system due to uneven concentration. 2.17.7Mass transfer coefficientA proportional coefficient in the mass transfer process equation, based on the mass transfer efficiency being proportional to the mass transfer driving force of the mass transfer area, kg·mol/(hm*.atm).
2.17.8Heat transfer
Abbreviation for heat transfer, the heat transfer process within the material system, where heat is transferred from a high temperature area to a low temperature area. Heat transfer coefficient (total heat transfer coefficient) heat transfer coefficient 2.17.9
is a proportional coefficient in the heat transfer process equation, which represents the value of the heat transfer intensity between the fluids on both sides of the solid wall, kJ/(m*.hc).
Heat conduction (heat conduction) heat conduction 2.17.10
A basic form of heat conduction The process of transferring heat energy from the high temperature part of an object to the low temperature part through the mutual collision of molecules, atoms or electrons in the material.
Heat exchange (heat exchange) heat exchange
The process of transferring heat energy from a hot fluid to a cold fluid indirectly (for example, through a partition) or directly. 2.17.12
Thermal radiation heat radiation
A basic form of heat conduction. An object radiates energy outward due to its own temperature. Its heat energy does not rely on any medium and propagates in space in the form of electromagnetic waves,
2.17.13 Convection heat transfer heatconvection is a basic way of heat transfer. The process of transferring heat from one place to another in a liquid or gas is referred to as convection. 2.17.14 Sublimation sublimation
The phenomenon that a solid (crystalline) substance directly changes into a gaseous state without passing through a liquid state. 2.17.14.1 Sublimation heat sublimation heat The heat required for a unit mass of solid to directly change into a gas. 2.17.14.2 Sublimation surface surface of sublimation The surface where free moisture in a solid state sublimates (i.e., the surface of ice nuclei, see 2.4.3). In advanced drying technology, it is also the interface between ice nuclei and the outer shell of the dry material. 2.17.15 Fluidization fluidzed
The state in which solid particles are suspended by contacting with a fluid (gas or liquid) The state in which the solid particles are not carried away by the fluid.
2.17.15.1 Fluidized bed (boiling bed) fluidzed-bed A layer of solid particles in a state like boiling liquid. 2.17.16 Spouted-bed
A bed where gas passes through a nozzle at a high speed to produce an artificial full flow phenomenon in the granular material. It can make the granular material move upward like a fountain, and after reaching a certain height, it will fall due to the gravity of the material itself, and then be carried upward by the air flow again in the shape of a fountain. It can be designed as an intermittent or continuous type. 3 Drying process
3.1 Drying types and methods 3.1.1 Mechanical drying The process of removing moisture by pressing, sedimentation, filtration, centrifugal separation and other mechanical methods. 3.1.2 Physical and chemical drying The process of directly using hygroscopic chemicals (such as sulfuric acid, anhydrous calcium oxide, etc.) as desiccant to absorb moisture. 3.1.3 Thermophysics drying The process of removing mixed particles by using the physical principle of phase change of moisture during heating or cooling. Intermittent drying Batehdrying
Drying of materials with intermittent loading and unloading.
3.1.5 Continuous drying Continuous drying Materials are continuously transferred from the inlet to the outlet of the dryer. 3.1.6 Direct heating drying Diect-heat drying Drying of materials directly heated by drying medium, Indirect heating drying Indiect-heat drying 3.1.7
Drying of materials indirectly heated by partitions. 3.1.8 Contact drying Contact drying
Drying of materials heated by conduction (materials in contact with heated surfaces). 3.1.9 Vapor drying Vapor phase drying Send fresh materials into the vacuum dryer, and after evacuation, introduce appropriate vapor (such as organic vapor, kerosene) to condense on the materials, and dry the materials with increased momentum through the condensation heat released by them. 3.1.10 Radiation drying Drying by radiation Drying of materials by heating them in the form of radiation, such as infrared drying. Dielectric drying/microwave drying Microwave drying 3.1.113
Drying of materials by direct heating in an alternating current electric field. Infrared drying Infrared drying
Drying of materials by heating them with infrared rays. High-frequency drying 3.1.13
Drying of materials in an alternating current electric field with a frequency of 1 to 10 MHz. 3.1.14 Solar drying, solar drying Drying of materials by heating them with solar energy,
3.1.15 Low temperature drying Low temperature drying 6
JB/T7250-94
Drying of materials by removing moisture from drying media below 45°C. 3.1.16 Convection drying Convection drying Drying of materials by heating them in the form of convection.
3.1.17 Static drying staticdrying
The material is placed in a grid and dried on a tunnel or belt with a relatively unchanged contact surface. Dynamic drying dynamicdrying
The material is dried with continuous or periodic movement. During the drying process, mechanical devices (such as blade-type dryers) or movable contact surfaces (such as dynamic dryers, simple dryers) are used to stir the material to shorten the drying time. Natural ventilating drying 3.1.19
Drying by natural convection of air to remove moisture. 3.1.20 Mechanical ventilating drying mechanicalventilating drying air is forced into the material to remove moisture. Airflow drying: pneumatic drying 3.1.21
Add the mixed mud, block, powder and granular materials into the dry coal pipe by appropriate feeding method, and be divided into micro-particles in the high-speed hot air flow. The wet materials are dehumidified during the air flow transportation process to obtain powder or granular dry materials. Fixed-bed drying: fixed-bed drying: fixed-bed drying: fixed-bed drying: During the drying process, the materials are in a static state. 3.1,23 Moving bed drying: movable bed drying: During the drying process, the materials are in a moving state. 3.1.24 Fluidized bed drying (boiled bed drying): fluidized bed drying (boiled bed drying): a drying method using a fluidized bed (boiling bed). 3.1.25 Spouted bed drying: spouted bed drying: a drying method using a spouted bed. 3.1.26 Concurrent flow drying: Drying in which the material flow direction is consistent with the flow direction of the drying medium in the dryer. Counterflow drying: Drying in which the material flow direction is opposite to the flow direction of the drying medium in the dryer. 3.1.28 Crossflow drying: Drying in which the material flow direction is perpendicular to the flow direction of the drying medium in the dryer. Rapid drying: Quick drying: Drying 3.1.29: Drying in which the material is in contact with the drying medium for only a few minutes or tens of minutes. 3.1.30 Prevailing pressure drying: A drying operation classified according to the operating pressure. 3.1.31 Vacuum drying: A thermal drying process under vacuum.
3.1.32 Vacuum freezing drying: A drying method that freezes water-containing materials below freezing point, converts water into ice, and then converts ice into steam under a relatively high vacuum to remove moisture. Vacuum freeze drying is carried out in the medium vacuum to high vacuum range. 3.1.33 Heat pump evaporation: A type of evaporation operation that uses the absolute compression effect of the compressor or the jet compression effect to increase the saturation temperature of the secondary vapor produced by the evaporator and send it back to the original evaporator for use as heating vapor. 3.1.34 Spray drying: Spray drying: Use an atomizer to disperse the raw material liquid (which can be a solution, emulsion or suspension, or a molten liquid or paste) into droplets, 715.1 Fluidized bed (boiling bed) fluidized-bed A layer of solid particles in a state like boiling liquid. 2.17.16 Spouted-bed
A bed in which gas passes through a nozzle at a high speed to produce an artificial full flow phenomenon in the granular material. It can make the granular material move upward like a fountain, and after reaching a certain height, it will fall due to the gravity of the material itself, and then be carried upward by the air flow again in the shape of a fountain. It can be designed as an intermittent or continuous type. 3 Drying process
3.1 Drying types and methods3.1.1 Mechanical drying The process of removing moisture by pressing, sedimentation, filtration, centrifugal separation machinery and other methods. 3.1.2 Physical and chemical drying The process of directly using hygroscopic chemicals (such as sulfuric acid, anhydrous calcium oxide, etc.) as desiccant to absorb moisture. 3.1.3 Thermophysics drying The process of removing mixed particles by using the physical principle of phase change of moisture during heating or cooling. Intermittent drying Batehdrying
Drying of materials with intermittent loading and unloading.
3.1.5 Continuous drying Continuous drying Materials are continuously transferred from the inlet to the outlet of the dryer. 3.1.6 Direct heating drying Diect-heat drying Drying of materials directly heated by drying medium, Indirect heating drying Indiect-heat drying 3.1.7
Drying of materials indirectly heated by partitions. 3.1.8 Contact drying Contact drying
Drying of materials heated by conduction (materials in contact with heated surfaces). 3.1.9 Vapor drying Vapor phase drying Send fresh materials into the vacuum dryer, and after evacuation, introduce appropriate vapor (such as organic vapor, kerosene) to condense on the materials, and dry the materials with increased momentum through the condensation heat released by them. 3.1.10 Radiation drying Drying by radiation Drying of materials by heating them in the form of radiation, such as infrared drying. Dielectric drying/microwave drying Microwave drying 3.1.113
Drying of materials by direct heating in an alternating current electric field. Infrared drying Infrared drying
Drying of materials by heating them with infrared rays. High-frequency drying 3.1.13
Drying of materials in an alternating current electric field with a frequency of 1 to 10 MHz. 3.1.14 Solar drying, solar drying Drying of materials by heating them with solar energy,
3.1.15 Low temperature drying Low temperature drying 6
JB/T7250-94
Drying of materials by removing moisture from drying media below 45°C. 3.1.16 Convection drying Convection drying Drying of materials by heating them in the form of convection.
3.1.17 Static drying staticdrying
The material is placed in a grid and dried on a tunnel or belt with a relatively unchanged contact surface. Dynamic drying dynamicdrying
The material is dried with continuous or periodic movement. During the drying process, mechanical devices (such as blade dryers) or movable contact surfaces (such as dynamic dryers, simple dryers) are used to stir the material to shorten the drying time. Natural ventilating drying natural ventilating drying 3.1.19
Drying by natural convection of air to remove moisture. 3.1.20 Mechanical ventilating drying mechanicalventilating drying air is forced into the material to remove moisture. Airflow drying: pneumatic drying 3.1.21
Add the mixed mud, block, powder and granular materials into the dry coal pipe by appropriate feeding method, and be divided into micro-particles in the high-speed hot air flow. The wet materials are dehumidified during the air flow transportation process to obtain powder or granular dry materials. Fixed-bed drying: fixed-bed drying: fixed-bed drying: fixed-bed drying: During the drying process, the materials are in a static state. 3.1, 23 Moving bed drying: movable bed drying: During the drying process, the materials are in a moving state. 3.1.24 Fluidized bed drying (boiled bed drying): fluidized bed drying (boiled bed drying): a drying method using a fluidized bed (boiling bed). 3.1.25 Spouted bed drying: spouted bed drying: a drying method using a spouted bed. 3.1.26 Concurrent flow drying: Drying in which the flow direction of the material is the same as that of the drying medium in the dryer. Counterflow drying: Drying in which the flow direction of the material is opposite to that of the drying medium in the dryer. 3.1.28 Crossflow drying: Drying in which the flow direction of the material is perpendicular to that of the drying medium in the dryer. Rapid drying: Quick drying: Drying 3.1.29: Drying in which the material is in contact with the drying medium for only a few minutes or tens of minutes. 3.1.30 Prevailing pressure drying: A drying operation classified according to the operating pressure. 3.1.31 Vacuum drying: A thermal drying process under vacuum.
3.1.32 Vacuum freezing drying: A drying method that freezes water-containing materials below freezing point, converts water into ice, and then converts ice into steam under a relatively high vacuum to remove moisture. Vacuum freeze drying is carried out in the medium vacuum to high vacuum range. 3.1.33 Heat pump evaporation: A type of evaporation operation that uses the absolute compression effect of the compressor or the jet compression effect to increase the saturation temperature of the secondary vapor produced by the evaporator and send it back to the original evaporator for use as heating vapor. 3.1.34 Spray drying: Spray drying: Use an atomizer to disperse the raw material liquid (which can be a solution, emulsion or suspension, or a molten liquid or paste) into droplets, 715.1 Fluidized bed (boiling bed) fluidized-bed A layer of solid particles in a state like boiling liquid. 2.17.16 Spouted-bed
A bed in which gas passes through a nozzle at a high speed to produce an artificial full flow phenomenon in the granular material. It can make the granular material move upward like a fountain, and after reaching a certain height, it will fall due to the gravity of the material itself, and then be carried upward by the air flow again in the shape of a fountain. It can be designed as an intermittent or continuous type. 3 Drying process
3.1 Drying types and methods3.1.1 Mechanical drying The process of removing moisture by pressing, sedimentation, filtration, centrifugal separation machinery and other methods. 3.1.2 Physical and chemical drying The process of directly using hygroscopic chemicals (such as sulfuric acid, anhydrous calcium oxide, etc.) as desiccant to absorb moisture. 3.1.3 Thermophysics drying The process of removing mixed particles by using the physical principle of phase change of moisture during heating or cooling. Intermittent drying Batehdrying
Drying of materials with intermittent loading and unloading.
3.1.5 Continuous drying Continuous drying Materials are continuously transferred from the inlet to the outlet of the dryer. 3.1.6 Direct heating drying Diect-heat drying Drying of materials directly heated by drying medium, Indirect heating drying Indiect-heat drying 3.1.7
Drying of materials indirectly heated by partitions. 3.1.8 Contact drying Contact drying
Drying of materials heated by conduction (materials in contact with heated surfaces). 3.1.9 Vapor drying Vapor phase drying Send fresh materials into the vacuum dryer, and after evacuation, introduce appropriate vapor (such as organic vapor, kerosene) to condense on the materials, and dry the materials with increased momentum through the condensation heat released by them. 3.1.10 Radiation drying Drying by radiation Drying of materials by heating them in the form of radiation, such as infrared drying. Dielectric drying/microwave drying Microwave drying 3.1.113
Drying of materials by direct heating in an alternating current electric field. Infrared drying Infrared drying
Drying of materials by heating them with infrared rays. High-frequency drying 3.1.13
Drying of materials in an alternating current electric field with a frequency of 1 to 10 MHz. 3.1.14 Solar drying, solar drying Drying of materials by heating them with solar energy,
3.1.15 Low temperature drying Low temperature drying 6
JB/T7250-94
Drying of materials by removing moisture from drying media below 45°C. 3.1.16 Convection drying Convection drying Drying of materials by heating them in the form of convection.
3.1.17 Static drying staticdrying
The material is placed in a grid and dried on a tunnel or belt with a relatively unchanged contact surface. Dynamic drying dynamicdrying
The material is dried with continuous or periodic movement. During the drying process, mechanical devices (such as blade dryers) or movable contact surfaces (such as dynamic dryers, simple dryers) are used to stir the material to shorten the drying time. Natural ventilating drying natural ventilating drying 3.1.19
Drying by natural convection of air to remove moisture. 3.1.20 Mechanical ventilating drying mechanicalventilating drying air is forced into the material to remove moisture. Airflow drying: pneumatic drying 3.1.21
Add the mixed mud, block, powder and granular materials into the dry coal pipe by appropriate feeding method, and be divided into micro-particles in the high-speed hot air flow. The wet materials are dehumidified during the air flow transportation process to obtain powder or granular dry materials. Fixed-bed drying: fixed-bed drying: fixed-bed drying: fixed-bed drying: During the drying process, the materials are in a static state. 3.1, 23 Moving bed drying: movable bed drying: During the drying process, the materials are in a moving state. 3.1.24 Fluidized bed drying (boiled bed drying): fluidized bed drying (boiled bed drying): a drying method using a fluidized bed (boiling bed). 3.1.25 Spouted bed drying: spouted bed drying: a drying method using a spouted bed. 3.1.26 Concurrent flow drying: Drying in which the material flow direction is consistent with the flow direction of the drying medium in the dryer. Counterflow drying: Drying in which the material flow direction is opposite to the flow direction of the drying medium in the dryer. 3.1.28 Crossflow drying: Drying in which the material flow direction is perpendicular to the flow direction of the drying medium in the dryer. Rapid drying: Quick drying: Drying 3.1.29: Drying in which the material is in contact with the drying medium for only a few minutes or tens of minutes. 3.1.30 Prevailing pressure drying: A drying operation classified according to the operating pressure. 3.1.31 Vacuum drying: A thermal drying process under vacuum.
3.1.32 Vacuum freezing drying: A drying method that freezes water-containing materials below freezing point, converts water into ice, and then converts ice into steam under a relatively high vacuum to remove moisture. Vacuum freeze drying is carried out in the medium vacuum to high vacuum range. 3.1.33 Heat pump evaporation: A type of evaporation operation that uses the absolute compression effect of the compressor or the jet compression effect to increase the saturation temperature of the secondary vapor produced by the evaporator and send it back to the original evaporator for use as heating vapor. 3.1.34 Spray drying: Spray drying: Use an atomizer to disperse the raw material liquid (which can be a solution, emulsion or suspension, or a molten liquid or paste) into droplets, 710 Radiation drying drying by radiation Drying of materials by heating them in the form of radiation, such as infrared drying. Dielectric drying/microwave drying microwave drying 3.1.113
Drying of materials by direct heating in an alternating current electric field. Infrared drying infrared drying
Drying of materials by heating them with infrared rays. High-frequency drying high-frequency drying 3.1.13
Drying of materials in an alternating current electric field with a frequency of 1 to 10 MHz. 3.1.14 Solar drying, solar drying using solar energy to heat the drying of materials,
3.1.15 Low temperature drying low temperature drying 6
JB/T7250-94
Drying of materials by removing moisture from drying media below 45°C. 3.1.16 Convection drying convection drying Drying of materials by heating them in the form of convection.
3.1.17 Static drying staticdrying
The material is placed in a grid and dried on a tunnel or belt with a relatively unchanged contact surface. Dynamic drying dynamicdrying
The material is dried with continuous or periodic movement. During the drying process, mechanical devices (such as blade-type dryers) or movable contact surfaces (such as dynamic dryers, simple dryers) are used to stir the material to shorten the drying time. Natural ventilating drying 3.1.19
Drying by natural convection of air to remove moisture. 3.1.20 Mechanical ventilating drying mechanicalventilating drying air is forced into the material to remove moisture. Airflow drying: pneumatic drying 3.1.21
Add the mixed mud, block, powder and granular materials into the dry coal pipe by appropriate feeding method, and be divided into micro-particles in the high-speed hot air flow. The wet materials are dehumidified during the air flow transportation process to obtain powder or granular dry materials. Fixed-bed drying: fixed-bed drying: fixed-bed drying: fixed-bed drying: During the drying process, the materials are in a static state. 3.1,23 Moving bed drying: movable bed drying: During the drying process, the materials are in a moving state. 3.1.24 Fluidized bed drying (boiled bed drying): fluidized bed drying (boiled bed drying): a drying method using a fluidized bed (boiling bed). 3.1.25 Spouted bed drying: spouted bed drying: a drying method using a spouted bed. 3.1.26 Concurrent flow drying: Drying in which the material flow direction is consistent with the flow direction of the drying medium in the dryer. Counterflow drying: Drying in which the material flow direction is opposite to the flow direction of the drying medium in the dryer. 3.1.28 Crossflow drying: Drying in which the material flow direction is perpendicular to the flow direction of the drying medium in the dryer. Rapid drying: Quick drying: Drying 3.1.29: Drying in which the material is in contact with the drying medium for only a few minutes or tens of minutes. 3.1.30 Prevailing pressure drying: A drying operation classified according to the operating pressure. 3.1.31 Vacuum drying: A thermal drying process under vacuum.
3.1.32 Vacuum freezing drying: A drying method that freezes water-containing materials below freezing point, converts water into ice, and then converts ice into steam under a relatively high vacuum to remove moisture. Vacuum freeze drying is carried out in the medium vacuum to high vacuum range. 3.1.33 Heat pump evaporation: A type of evaporation operation that uses the absolute compression effect of the compressor or the jet compression effect to increase the saturation temperature of the secondary vapor produced by the evaporator and send it back to the original evaporator for use as heating vapor. 3.1.34 Spray drying: Spray drying: Use an atomizer to disperse the raw material liquid (which can be a solution, emulsion or suspension, or a molten liquid or paste) into droplets, 710 Radiation drying drying by radiation Drying of materials by heating them in the form of radiation, such as infrared drying. Dielectric drying/microwave drying microwave drying 3.1.113
Drying of materials by direct heating in an alternating current electric field. Infrared drying infrared drying
Drying of materials by heating them with infrared rays. High-frequency drying high-frequency drying 3.1.13
Drying of materials in an alternating current electric field with a frequency of 1 to 10 MHz. 3.1.14 Solar drying, solar drying using solar energy to heat the drying of materials,
3.1.15 Low temperature drying low temperature drying 6
JB/T7250-94
Drying of materials by removing moisture from drying media below 45°C. 3.1.16 Convection drying convection drying Drying of materials by heating them in the form of convection.
3.1.17 Static drying staticdrying
The material is placed in a grid and dried on a tunnel or belt with a relatively unchanged contact surface. Dynamic drying dynamicdrying
The material is dried with continuous or periodic movement. During the drying process, mechanical devices (such as blade-type dryers) or movable contact surfaces (such as dynamic dryers, simple dryers) are used to stir the material to shorten the drying time. Natural ventilating drying 3.1.19
Drying by natural convection of air to remove moisture. 3.1.20 Mechanical ventilating drying mechanicalventilating drying air is forced into the material to remove moisture. Airflow drying: pneumatic drying 3.1.21
Add the mixed mud, block, powder and granular materials into the dry coal pipe by appropriate feeding method, and be divided into micro-particles in the high-speed hot air flow. The wet materials are dehumidified during the air flow transportation process to obtain powder or granular dry materials. Fixed-bed drying: fixed-bed drying: fixed-bed drying: fixed-bed drying: During the drying process, the materials are in a static state. 3.1,23 Moving bed drying: movable bed drying: During the drying process, the materials are in a moving state. 3.1.24 Fluidized bed drying (boiled bed drying): fluidized bed drying (boiled bed drying): a drying method using a fluidized bed (boiling bed). 3.1.25 Spouted bed drying: spouted bed drying: a drying method using a spouted bed. 3.1.26 Concurrent flow drying: Drying in which the flow direction of the material is the same as that of the drying medium in the dryer. Counterflow drying: Drying in which the flow direction of the material is opposite to that of the drying medium in the dryer. 3.1.28 Crossflow drying: Drying in which the flow direction of the material is perpendicular to that of the drying medium in the dryer. Rapid drying: Quick drying: Drying 3.1.29: Drying in which the material is in contact with the drying medium for only a few minutes or tens of minutes. 3.1.30 Prevailing pressure drying: A drying operation classified according to the operating pressure. 3.1.31 Vacuum drying: A thermal drying process under vacuum.
3.1.32 Vacuum freezing drying: A drying method that freezes water-containing materials below freezing point, converts water into ice, and then converts ice into steam under a relatively high vacuum to remove moisture. Vacuum freeze drying is carried out in the medium vacuum to high vacuum range. 3.1.33 Heat pump evaporation: A type of evaporation operation that uses the absolute compression effect of the compressor or the jet compression effect to increase the saturation temperature of the secondary vapor produced by the evaporator and send it back to the original evaporator for use as heating vapor. 3.1.34 Spray drying: Spray drying: Use an atomizer to disperse the raw material liquid (which can be a solution, emulsion or suspension, or a molten liquid or paste) into droplets, 733 Heat pump evaporation heat pump evaporation is a type of evaporation operation, which uses the absolute compression effect of the compressor or the jet compression effect to increase the saturation temperature of the secondary vapor produced by the evaporator and send it back to the original evaporator for use as heating vapor. 3.1.34 Spray drying spray drying
Use an atomizer to disperse the raw material liquid (which can be a solution, emulsion or suspension, or a molten liquid or paste) into droplets,33 Heat pump evaporation heat pump evaporation is a type of evaporation operation, which uses the absolute compression effect of the compressor or the jet compression effect to increase the saturation temperature of the secondary vapor produced by the evaporator and send it back to the original evaporator for use as heating vapor. 3.1.34 Spray drying spray drying
Use an atomizer to disperse the raw material liquid (which can be a solution, emulsion or suspension, or a molten liquid or paste) into droplets,
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