Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6759-1993
QX Series Endothermic Gas Generator
Published on August 21, 1993
Ministry of Machinery Industry of the People's Republic of China
Implemented on October 1, 1993
Mechanical Industry Standard of the People's Republic of China
QX Series Endothermic Gas Generator
Subject Content and Scope of Application
JB/T 67591993
Replaces JB/DQ5073-82
This standard specifies the requirements for QX series endothermic gas generators (hereinafter referred to as generators), including specifications, technical performance, ordering and supply, etc.
This standard applies to endothermic gas generators designed according to the requirements of Articles 4.1, 5.1 and 5.2, and mainly used for alkane gases as raw materials.
Cited standards
GB10067.1
GB10067.4
GB10066.1
GB10066.4
ZBK60001
JB2841
3Terms
Basic technical conditions for electric heating equipment
General part
Basic technical conditions for electric heating equipment
Question about connected resistance furnace
Test methods for electric heating equipment
General part||tt| |Test methods for electric heating equipment
Indirect resistance furnace
Safety of electric heating equipmentPart 1
General part
Safety of electric heating equipmentPart 4
Special requirements for resistance furnaces
Product model compilation method for electric heating equipment
Basic technical conditions for control gas generators shall be in accordance with the provisions of Chapter 3 of JB2841
4 Product classification
4.1 Varieties and specifications
4.1.1 Generators are divided into two varieties according to the heating method, as shown in Table 1. Table 1
Variety code
4.1.2 Generators of each variety are divided into multiple specifications according to the gas production rate. Unless otherwise agreed upon by the supply and demand parties, the gas production rate of the generator shall comply with the following provisions: Minimum specification: 10m/h
Heating method
Electric heating
Gas heating
Other specifications: First increase by 10m/h, and then increase by 20m/h after reaching 40m/h. 4.1.3 Each generator manufacturer can choose from the varieties and specifications specified in Articles 4.1.1 and 4.1.2, and formulate their own enterprise product standards for generators.
4.2 Model
The model of the generator shall be compiled in accordance with ZBK60001, in which the "main parameter" is the "rated gas production rate" (m/h). 4.3 Main parameters
Approved by the Ministry of Machinery Industry on August 21, 1993
Implemented on October 1, 1993
JB/T 6759-1993
The main parameters of each type of generator shall comply with the provisions of Article 4.2 of JB2841. 5 Technical requirements
5.1 General requirements
The generator shall comply with the relevant provisions of Chapter 5 of JB2841 and GB5959.4. When there is a discrepancy between this standard and the provisions of these standards, this standard shall prevail.
5.2 Supplementary requirements for design and manufacturing
5.2.1 Overall design
The generator usually consists of the following five parts:. Gas generation part: It consists of a heating chamber, a reaction tank with a catalyst, a cooler, etc. b. Raw gas-air mixing system: It generally consists of a solenoid valve, a pressure reducing valve, a flow meter, a zero pressure valve, a proportioning mixer, a pressure gauge, a pressure gauge, etc. c. Gas production rate control part: It generally consists of a booster pump, a circulation valve, a relief valve, a three-way valve, a flow meter, a pressure gauge, etc. d. Safety part: It generally consists of a melter, an explosion-proof device, etc. Temperature, dew point or CO, measurement and control system: It consists of a control cabinet, a temperature instrument, a dew point or a gas analyzer, etc. e. The design of the generator should be able to select the required raw gas-air mixing ratio. During the operation of the generator, the selected mixing ratio should be able to be automatically adjusted within a certain range. 5.2.1.1 QX type generator QX type generator adopts electric heating. Unless otherwise specified (see Article 9.2), the power supply of the generator should be a three-phase power supply of 380V and 50Hz. Its heating chamber is composed of shell, furnace village, electric heating elements, etc. 5.2.1.2QXQ type generator
QXQ type generator adopts gas heating. The type, calorific value and supply pressure of the gas used shall be specified in the enterprise production standard or agreed upon by the supply and demand parties (see Article 9.2). Its heating chamber is composed of shell, furnace lining, gas combustion device, etc. 5.2.2 Shell and base
The shell and base of the generator shall be welded with steel plate and steel section respectively to form an integral structure with sufficient strength and rigidity. 5.2.3 Reactor and catalyst
The materials of the reaction shall be made of heat-resistant alloys that can meet its working conditions and service life. The design and manufacture of the reactor shall ensure that it has sufficient strength at its working temperature and does not produce deformation and leakage that hinders normal operation within the specified service life.
The catalyst shall have sufficient strength and suitable shape to prevent it from pulverizing and compacting in the reactor, and shall provide sufficient surface area required for gas production reaction. The catalyst should have sufficient catalytic activity and high anti-poisoning ability to accelerate the reaction and ensure normal gas production rate. 5.2.4 Furnace lining
The material and structure of the furnace lining should meet the performance requirements of the generator (see Table 5.3). 5.2.5 Heating system
5.2.5.1 The design of the electric heating parts of the QX type generator should meet the heating requirements of the generator to reach the rated temperature. The heating element is made of electric heating alloy, and its installation should ensure that no displacement and deformation that affects the working performance occurs under normal working conditions. 5.2.5.2 The gas heating system of the QXQ type generator should be a complete set. When the generator is working at the maximum gas production rate, the combustion temperature shall not be lower than 1050°℃. Each gas combustion device shall be equipped with its own flame control device. If a combustion blower is used in the design, the system should be equipped with an air filter, various pressure gauges, and control equipment with a gas regulator and a proportion mixer. 5.2.6 Raw gas-air mixing system
The system should be able to adjust and stabilize the mixing ratio of raw gas and air and make them mix evenly. 5.2.7 Cooler
When the generator is working at the maximum gas production rate, the cooler should be able to rapidly cool the produced gas to below 300℃ to avoid the precipitation of carbon black due to the decomposition of CO.
JB/T6759-1993
5.2.8 The recommended working parameters of the three regulators, zero pressure valve, circulation valve and relief valve, are shown in Table 2. Table 2
Regulator
Zero pressure valve
Circulation valve
Relief valve
Primary pressure
3000~5000
5000~9900
5000~9900
Secondary pressure
Signal pressure
35005000
4300~5900
Not less than the flow rate of raw gas at rated gas production rateMore than 35% of the flow rate of mixed gas at rated gas production rateMore than 35% of the flow rate of mixed gas at rated gas production rateThe structure of the zero pressure valve should enable the air and raw gas to be mixed at the same pressure to ensure a stable mixing ratio. The circulation valve should be connected in parallel with the booster pump. When the gas production amount becomes smaller, part of the mixed gas forms an internal circulation with the booster pump through the circulation valve to ensure the normal operation of the booster pump.
When the circulation valve is opened and the booster forms an internal circulation, if the gas production volume continues to decrease, part of the mixed gas should be discharged through the venting to ensure that the booster pump can work normally. 5.2.9 Flame arrester and explosion proof device
When the system pipeline flashes back, the flame arrester should absorb the heat of the gas, extinguish the flame, and ensure the safety and integrity of the generating device. The explosion proof device should relieve the pressure when the reaction tank is over-pressurized. 5.2.10 Measurement, control and recording
The measurement, control and recording of the generating device shall comply with the provisions of Articles 5.2.7.1, 5.2.7.2, 5.2.7.4, 5.2.7.5, 5.2.7.6 and 5.2.7.12 of GB10067.4.
The accuracy of the temperature instrument shall not be less than Class 0.5. When otherwise specified or required (see Article 9.2), it can also be Class 1. The accuracy of flow meter and pressure gauge should not be less than 2.Level 5.
The generator shall be equipped with instruments and corresponding sensor elements for indicating, controlling and recording the gas composition. The type and technical performance of the instruments used shall be specified in the enterprise product standards or agreed upon by the supply and demand parties (see Article 9.2). 5.2.11 Other safety devices
The generator shall be equipped with an upper and lower limit alarm system for furnace temperature, and the circuit of the system shall be independent. When the temperature of the heating chamber of the generator reaches the upper and lower limit control points of the furnace temperature, the system shall issue an alarm signal. In the event of a power supply, gas supply or combustion failure, an alarm signal shall be issued or the gas source shall be shut down. When the pressure of the raw gas inlet (before the pressure reducing valve) is lower than 0.05MPa, an alarm signal shall be issued or the gas source shall be cut off to stop the gas supply to ensure safety and gas production quality.
A normally closed electric valve with a normally open auxiliary contact shall be installed on the gas pipeline connected to the mixing system. When the booster pump is started, the electric valve shall be opened, and when the electric valve fails, the auxiliary contact shall stop the booster pump. 5.2.12 After cold adjustment, the generating device shall meet the following requirements: a. The pipeline system shall be free of blockage and leakage; b. The mixer, zero pressure valve, circulation valve and relief valve shall work in coordination to match the pressure of the air and raw gas circuits, ensuring that the air and raw gas are mixed in strict proportion and sent to the reaction tank; c. The mixing ratio of air and raw gas shall be adjusted arbitrarily within the range specified by the enterprise product standards, and the pressure difference between the two gas circuits shall not be greater than c.
±30Pa (±3mmH,0); |tt||After meeting the above requirements, when the total outlet pressure of gas production changes, as the pressure increases, the circulation valve starts to act from a certain pressure signal (e.g. 3500Pa). When the pressure increases to a certain value (e.g. 4300Pa), the circulation volume should reach 1/3 of the mixed gas volume at the rated gas production rate. When the pressure continues to increase, the relief valve starts to act. When the pressure increases to a certain value (e.g. 5000Pa), the relief volume should reach 1/3 of the mixed gas volume at the rated gas production rate:
JB/T 6759—1993
When the circulation valve is working, as the circulation volume increases, the air flow rate and the raw gas flow rate should decrease proportionally accordingly. The difference between the percentage decrease of air and raw gas flow should not be greater than 2% (for example, if the air flow decreases by 30%, the raw gas flow should decrease within the range of 28% to 32%).
r. When the circulation valve is in effect, the zero-pressure valve should still ensure that the pressure difference between air and raw gas is no more than 30Pa. 5.3 Performance requirements
The performance of the generator shall comply with the requirements of Article 5.3 and the following articles of JB2841. 5.3.1 Rated temperature
The rated temperature shall be specified in the enterprise product standard. When operating at the rated temperature, the generator shall meet the requirements of Articles 5.3.2 to 5.3.4. 5.3.2 Rated gas production rate
The rated gas production rate of the generator shall comply with the provisions of the enterprise product standard. 5.3.3 Gas outlet pressure
The recommended gas outlet pressure values of the generator at different gas production rates are as follows: 3500±100Pa at rated gas production rate;
3200±100Pas at maximum gas production rate
5000±100Pa at minimum gas production rate.
5.3.4 Gas composition
The reference value of the gas composition of the generator is as follows: co
5.3.5 Furnace temperature stability
The furnace temperature stability of the generator should not exceed ±5℃. 5.3.6 Surface temperature rise
20%~25%
30%~41%
Remaining part
+8~-6℃ (or HO1%~0.4%)
When the generator is in rated working condition, the surface temperature rise of the furnace shell and the furnace top plate shall not exceed 60C and 100℃ respectively. 5.3.7 Gas production energy consumption
When the generator is in rated working condition, its gas production energy consumption shall be specified in its enterprise product standards. 5.3.8 Gas dew point or CO. control accuracy
The gas dew point control accuracy of the generator shall not exceed ±1℃, or CO, the control accuracy shall not exceed ±0.02%. 5.3.9 Others
Other aspects of the performance of the generator shall comply with Article 5.2 of this standard, as well as the corresponding provisions in the enterprise product standards and supply contracts. 5.4 Complete set requirements
5.4.1 The complete set supply scope of the generating device specified by the supplier shall be listed in the enterprise product standards, which shall mainly include the following items: a.
Generator (including cooler, heating chamber, reaction tank, base, pipeline system, etc.); temperature control cabinet;
thermocouple;
compensation wire:
gas control cabinet (including dew point meter or infrared gas analyzer, etc.); spare parts,
g. "Product manual", including necessary drawings. JB/T6759—1993
Necessary supplements may be made to the above items in the enterprise product standards, and the specific contents of each item shall be listed, including model, specification and quantity.
If the purchaser has different requirements for the items supplied by the supplier, it can be proposed in accordance with Article 9.2. 5.4.2 When the purchaser requires the provision of the following accessories or devices, it can be proposed in accordance with Article 9.2, and the necessary technical requirements shall be agreed upon by the supply and demand parties. 8. Other measuring instruments not specified in this standard; b.
Ostwald analyzer or gas chromatograph;
c. Liquid storage tank.
6 Test method
The test method of the generator shall be carried out in accordance with the corresponding provisions of Chapter 6 of JB2841 and the following supplementary provisions. If necessary, it shall be supplemented in the enterprise product standard.
When the generator is cold-adjusted and the gas production rate and gas production outlet pressure are measured, compressed air can be used to replace the raw gas to be sent into the reaction tank. The amount of air sent into the raw gas line shall be converted according to the following formula: Q air =
Wherein, P——air density, P=1.29kg/m, P——raw gas density, kg/m\,
Q—air flow, m/h;
Q——raw gas flow, m/h.
When the generator is undergoing type testing, the raw gas used, for example: the alkane content of propane and butane liquefied petroleum gas should be greater than 80%, and the total sulfide content should be less than 0.015% (weight ratio). Cold adjustment of pipelines and regulating systems:
When the generator is cold, feed the raw gas (compressed air can be used instead) and air to adjust the regulators and valves in each gas system according to the specified mixing ratio, so that the operation of the generator meets the requirements of Article 5.2.12. 7
Inspection rules
The inspection rules for the generator should be carried out in accordance with Chapter 7 and the following articles of JB2841. 7.1
The factory inspection items of the generator should include the following: a.
General inspection;
Safety inspection (including inspection of explosion-proof device); durability test of label writing;
Inspection of furnace lining quality;
Inspection of water and gas system;
Inspection of reaction tank size and manufacturing quality; Inspection of manufacturing quality of heating parts (applicable to QX type generator); Measurement of cold DC resistance of metal heating elements (applicable to QX type generator); Inspection of short circuit of heating elements to furnace shell (applicable to QX type generator); Measurement of insulation resistance (applicable to QX type generator of oven before leaving the factory); Insulation withstand voltage test (applicable to QX type generator); Cold adjustment of pipeline and regulating system;
Calibration of temperature instrument;
JB/T 6759—1993
Cold inspection of the operation or action of the return engine! Inspection of the alarm system Inspection of accessories, including model, specification, and factory certificate: Scope of supply, including inspection of the integrity of factory technical documents: Packaging and packaging, The test items of the generator should include the following items: 72
Full factory inspection items (under type inspection conditions): b
Measurement of rated power (applicable to QX type generators) Measurement of rated acceleration: Measurement of furnace stability: Measurement of raw gas inlet and outlet pressures Measurement of maximum gas production rate and raw gas consumption as well as maximum and minimum gas production rate: Measurement of gas outlet pressure: Measurement of gas components: Measurement of gas dew point or CO, control accuracy: Gas dew point to CO, adjustment range Quantity: Wet volume of gas production energy consumption:
The amount of water consumption per liter,
Marking, packaging, transportation and storage
The marking, packaging, transportation and storage of the generator shall comply with the provisions of Chapter B of JB2841. The following items shall be marked on the nameplate of the generator: Product weight and name:
Rated gas production, m/h
Power supply voltage: V (applicable to QX generators) Power supply frequency, H (applicable to QX generators) Number of phases (applicable to QX generators): Rated power (applicable to QX generators): Heating element connection (applicable to three-phase QX generators): Rated temperature. Ct
Gas feed consumption, m+/h or kg/h) (applicable to QxQ generators): Generator weight!
Product number:
Date of creation,
Name of manufacturer (country name should be indicated for export products) 9. Ordering and supply
The ordering and supply of generators shall be in accordance with the provisions of Chapter 9. of JB2841. The type of raw gas used shall be stated in the ordering documents (methane, 9.1
methane, butane, etc.).
Specifically, 2. If the purchaser has the following special requirements, it may propose them to the supplier: Different requirements for unit power, voltage, power supply, etc. (see Article 5.1.1.1 of GB10067.1 and Article 5.2.11 of this standard
JB/T6759-1993 Different requirements for the use environment (see Article 5.1.2 of GB10067.1) Item 5.1.5.1 of GB10067.1); different requirements for painting (see item 5.2.7 of GB10067.1); special requirements for packaging (see item 8.2.5 of GB10067.1); different requirements for power supply (see item 5.2.2 of GB10067.4); different requirements for the length of thermocouple lead wires or compensation wires (see item 5.2.7.1 of GB10067.4); different requirements for temperature instrument types, etc. (see item 5.2.10 of this standard and item 5.2.7.6 of GB10067.4); requiring the control cabinet (station) to have a vibration absorption device (see item 5.2.7.12 of GB10067.4); different requirements for the type of gas Requirements on type, calorific value and supply pressure (see Article 5.2.1.2); requirements on instruments used for gas control (see Article 5.2.10); different requirements on the supply items specified by the supplier (see Article 5.4.1); requirements for the provision of other measuring instruments not specified in this standard (see Article 5.4.2, item a); requirements for the provision of Ostwald analyzer or gas chromatograph (see Article 5.4.2, item b); requirements for the provision of liquid storage tanks (see Article 5.4.2, item c). The supplier should try its best to meet the special requirements of the purchaser, but the special requirements items that can actually be selected by the purchaser shall be determined by the supplier in accordance with their respective conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the rest shall be agreed upon by the supply and demand parties when placing an order. Enterprise product standard
Generator The enterprise product standards of the generators shall be formulated in accordance with the provisions of Article 1.3.3 of GB10067.1 and meet the requirements of this standard.
For generators with design differences from the requirements of Articles 4.1, 5.1 and 5.2, their enterprise product standards shall be formulated in reference to this standard, and their technical performance shall meet the requirements of Article 5.3 of this standard unless otherwise specified or otherwise agreed upon by the supply and demand parties. Before Chapter 1 of the enterprise product standard of the generator, it shall be stated: "This standard is formulated in accordance with (or with reference to) JB6759--93 "QX Series Endothermic Gas Generator".
Additional Notes:
This standard is proposed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard is under the jurisdiction of the Xi'an Electric Furnace Research Institute of the Ministry of Machinery Industry. This standard is drafted by the Xi'an Electric Furnace Research Institute. The main drafters of this standard are Cao Wenxiu and Kou Jun. From the date of implementation of this standard, JB/DQ5073-82 "QX Series Endothermic Gas Generator" will be invalid. 7
People's Republic of China
Mechanical Industry Standard
QX Series Endothermic Gas Generator
JB/T 67591993
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Number of words xXX,XXX
Printing sheets X/X
Format 880×1230
Edition X, XX, 19XX
Printing X, XX, 19XX
Printing number 1XXX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_689/82, item c). The supplier shall try to meet the special requirements of the demander, but the special requirements that the demander can choose shall be determined by the supplier according to their own conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the other parts shall be agreed upon by the supplier and the demander when placing an order. Enterprise product standards
The enterprise product standards of the generator shall be formulated in accordance with the provisions of Article 1.3.3 of GB10067.1 and in accordance with this standard, and shall meet the requirements of this standard.
For generators that differ in design from the requirements of Articles 4.1, 5.1 and 5.2, their enterprise product standards shall be formulated in accordance with this standard, and their technical performance shall meet the requirements of Article 5.3 of this standard unless otherwise specified or otherwise agreed upon by the supplier and the demander. Before Chapter 1 of the enterprise product standards of the generator, it shall be stated: "This standard is formulated in accordance with (or with reference to) JB6759--93 "QX Series Endothermic Gas Generator".
Additional notes:
This standard is proposed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard is under the jurisdiction of Xi'an Electric Furnace Research Institute of the Ministry of Machinery Industry. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafters of this standard are Cao Wenxiu and Kou Jun. From the date of implementation of this standard, JB/DQ5073-82 "QX Series Endothermic Gas Generator" will be invalid. 7
People's Republic of China
Mechanical Industry Standard
QX Series Endothermic Gas Generator
JB/T 67591993
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Number of words xXX,XXX
Printing sheets X/X
Format 880×1230
Edition X, XX, 19XX
Printing X, XX, 19XX
Printing number 1XXX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_689/82, item c). The supplier shall try to meet the special requirements of the demander, but the special requirements that the demander can choose shall be determined by the supplier according to their own conditions with reference to this standard. Some of them can be listed in the enterprise product standards, and the other parts shall be agreed upon by the supplier and the demander when placing an order. Enterprise product standards
The enterprise product standards of the generator shall be formulated in accordance with the provisions of Article 1.3.3 of GB10067.1 and in accordance with this standard, and shall meet the requirements of this standard.
For generators that differ in design from the requirements of Articles 4.1, 5.1 and 5.2, their enterprise product standards shall be formulated in accordance with this standard, and their technical performance shall meet the requirements of Article 5.3 of this standard unless otherwise specified or otherwise agreed upon by the supplier and the demander. Before Chapter 1 of the enterprise product standards of the generator, it shall be stated: "This standard is formulated in accordance with (or with reference to) JB6759--93 "QX Series Endothermic Gas Generator".
Additional notes:
This standard is proposed by the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard is under the jurisdiction of Xi'an Electric Furnace Research Institute of the Ministry of Machinery Industry. This standard was drafted by Xi'an Electric Furnace Research Institute. The main drafters of this standard are Cao Wenxiu and Kou Jun. From the date of implementation of this standard, JB/DQ5073-82 "QX Series Endothermic Gas Generator" will be invalid. 7
People's Republic of China
Mechanical Industry Standard
QX Series Endothermic Gas Generator
JB/T 67591993
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Number of words xXX,XXX
Printing sheets X/X
Format 880×1230
Edition X, XX, 19XX
Printing X, XX, 19XX
Printing number 1XXXwwW.bzxz.Net
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://www.JB.ac.cn661_689/8
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