HG/T 20591-1997 Technical regulations for design of chemical steam condensate system
Some standard content:
Industry Standard of the People's Republic of China
HG/T20591-97
Design of Chemical Steam Condensate System
Technology·Regulations
Issued on September 14, 1997
1998-01-01
Ministry of Chemical Industry of the People's Republic of China
-Implementation
Document of the Ministry of Chemical Industry
Hua Jian Fa (1997) No. 598
Notice on the Issuance of Four Industry Standards Including the "Standard Series of Mufflers for Common Equipment in Chemical Plants" To all chemical industry departments (bureaus, head offices) of provinces, autonomous regions, municipalities directly under the Central Government, and cities with independent planning status, and all relevant units:
The four standards including the "Standard Series of Mufflers for Common Equipment in Chemical Plants" compiled by the relevant design and technology center stations of the Ministry of Chemical Industry have been reviewed and approved as recommended industry standards and will be implemented from January 1, 1998. The standard name, number, organization unit and editor-in-chief unit are detailed in the attached table.
The four standards are managed by their respective organizations and published and distributed by the Engineering Construction Standards Editing Center of the Ministry of Chemical Industry. Ministry of Chemical Industry
September 14, 1997
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Standard Name
Commonly Used in Chemical Plants
Standard Number
Equipment Muffler HG/T21616-
Standard Series
Chemical Mechanization
Transportation Process Design
Content and Depth Gauge
Modified Polypropylene
Organizing Unit Chief Editor
Ministry of Chemical Industry Environmental Protection Design Technology Center of Jilin Chemical Industry Company
Design Institute| |tt||Ministry of Chemical Industry Powder Ministry of Chemical Industry Powder
Body transport equipment Body transport equipment Replaces CL
Design technology in design technology 131A2-84
Ministry of Chemical Industry Equipment
Box and plate frame
HG/T21615-97 Equipment design technology
Type filter press system
Chemical steam condensation
Shanghai Chemical Industry
Design Institute
Technical Center Station
Ministry of Chemical Industry Heat Treatment Plant Jilin Chemical
Water Treatment Plant Design Institute
m Replaces CD
100A16-87||tt ||Industry Standard of the People's Republic of China
Technical Regulations for Design of Chemical Steam Condensate System HG/T20591--97
Editor: Design Institute of Jilin Chemical Industry Corporation Approval Department: Ministry of Chemical Industry Implementation Date: January 1, 1998 Engineering Construction Standard Editing Center of Ministry of Chemical Industry
General Regulations
3 System Type
Chapter
3.1 Open Condensate Recovery System
3.2 Closed Condensate Recovery System**
4 System Design
4.1 Basis for Design
4.2 Principles for Design
5 Selection and Calculation of Main Equipment in the System
5.1 Selection and calculation of steam trap
5.2 Selection of condensate tank
5.3 Selection and calculation of secondary evaporation tank
Hydraulic calculation of condensate pipe
6.1 Primary side of hydraulic calculation of condensate pipe
6.2 Hydraulic calculation formula of condensate pipe
7 System control and condensate quality monitoring - Appendix A Condensate recovery data table
Appendix B Explanation of terms used in this regulation
Explanation of clauses
1.0.1 This regulation is formulated to implement the national energy-saving policy, reduce the total energy consumption of the steam system, improve the design level of the steam condensate system, and make the system safe and reliable, flexible in operation, advanced in technology, and economically reasonable.
1.0.2 This regulation mainly stipulates the type of chemical steam condensate system, the system formulation, the selection and calculation of the main equipment in the system, the system control and the condensate quality monitoring.
1.0.3 These regulations apply to the design of steam condensate systems for new construction, renovation and expansion of chemical projects.
1.0.4 If there is any conflict between these regulations and national standards, the national standards shall prevail. 1.0.5 Reference standards
Economic and Energy Document No. 19847483
State Council Document No. 19827102
HG/T20521
"Technical Management Requirements for Condensate Recovery and Steam Trap in Steam Heating Systems"
"Interim Regulations on Energy Saving in Heating Systems" "State Council Directive on Saving Coal for Industrial Boilers (Energy Saving Directive No. 4)"
"Design Regulations for Chemical Steam Systems"
"Design Code for Urban Heating Networks"
2 General Provisions
2.0.1 In principle, the condensate generated by the steam heating system should be recycled. However, if the condensate below 100kg/h is difficult to recycle and is not economical, it may not be recycled temporarily, but measures should be taken to fully utilize it on site. 2.0.2 Condensate generated by steam heating system should be recycled. However, condensate heated with highly corrosive substances should not be recycled. Condensate heated with oil tanks and toxic substances is strictly prohibited from being recycled when there is domestic steam; it is also not suitable to be recycled when there is no domestic steam. 2.0.3 Steam heating system steam equipment should adopt steam indirect heating to improve the condensate recovery rate. For indirect heating production equipment, the condensate recovery rate should not be less than 80%.
2.0.4 When designing new or improving existing condensate systems, the waste heat of secondary steam and condensate should be fully utilized to reduce corrosion and environmental pollution. 2.0.5 For condensate that may be contaminated, if it has recycling value after technical and economic comparison, water quality monitoring and purification equipment should be installed to purify and recycle it. If it cannot be recycled, its heat energy should also be recovered.
2.0.6 The recovered condensate meets the requirements of GB1576 "Low-pressure boiler water quality standard" or GB12145 "Water and steam quality standard for thermal power generating units and steam power equipment", and is suitable for use in boilers of all levels. If the above standards are not met, water quality treatment must be carried out, and it can be used in boilers only after it meets the standards. If it is still unqualified after treatment, it does not need to be treated and can be used for other purposes. 2
3 System type
3.1 Open condensate recovery system
Condensate recovery system in which condensate is in direct contact with the atmosphere: 3.1.1 Open back pressure condensate recovery system
Condensate recovery system using the back pressure of the steam trap as power. 3.1.2 Open gravity condensate recovery system
Open condensate recovery system using the available condensate level energy as power. 3.1.3 Open pressurized condensate recovery system
Open condensate recovery system using water pumps or other equipment for forced recovery. 3.2 Closed condensate recovery system
Condensate recovery system in which condensate is not in direct contact with the atmosphere: 3.2.1 Closed back pressure condensate recovery system
Condensate recovery system using the back pressure of the steam trap as the power. 3.2.2 Closed full pipe condensate recovery system
Condensate recovery system using a combination of gravity and back pressure. 3.2.3 Closed pressurized condensate recovery system
Closed condensate recovery system using water pumps or other equipment for forced recovery. 3
4. 11
System design
4.1 Basis for design
Condensate recovery quantity, temperature, pressure, quality, etc., see Appendix A for details. Full steam balance, plant general plan, topographic map, regional map, vertical map. 4.1.23
4.2 Principles of formulation
4.2.1 The selection of the system should be determined after comparing technical and economic plans based on the topography of the plant area, user distribution, characteristics of steam-using equipment, steam supply pressure and temperature, secondary steam and condensate utilization methods, and condensate return volume. 4.2.2 The formulation of the condensate recovery system should be carried out simultaneously with the formulation of the steam system. 4.2.3 The open condensate recovery system has large heat loss, easy corrosion of pipelines, and affects the environment, so it is not suitable for use. If it is adopted, effective measures should be taken to reduce equipment and pipeline corrosion. 4.2.3.1 The open back pressure condensate recovery system is simple and reliable, and is suitable for steam-using equipment with a steam pressure of 0.1~~0.3MPa and a small amount of secondary steam or the situation where the secondary steam cannot be recovered.
4.2.3.2 The open gravity condensate recovery system is suitable for small steam heating systems with low condensate tanks and trench laying. 4.2.4 New or expanded condensate recovery systems should adopt closed condensate recovery systems.
4.2.4.1 The closed back pressure condensate recovery system is simple, and the waste heat is easy to use in a centralized manner. The condensate pipeline can be laid overhead or underground according to the situation. When using the back pressure method to recover condensate, the following requirements should be met: (1) The diameter of the condensate pipeline should be calculated according to the steam-water mixing state: 4
Ww.bzsosD.com (2) The pressure of the condensate after the steam trap should be greater than the resistance of the condensate system; (3) When condensate with a large pressure difference merges, measures should be taken to ensure that it can all return to the condensate tank.
4.2.4.2 The closed full pipe condensate recovery system makes full use of the secondary steam, eliminates the interference caused by different pressures between users, and works stably, but there are more equipment and it is suitable for the situation where the secondary steam can be used on site.
When using the closed full pipe condensate recovery system, hydraulic calculations and hydraulic pressure diagrams should be performed to determine the height of the secondary evaporation tank and the pressure of the secondary steam, and to ensure that the condensate of all users can return to the condensate tank.
4.2.5 The pressurized condensate recovery system is suitable for situations with large terrain undulations, scattered users, and long distances from the condensate station. However, the system investment and operating costs are high, and it is suitable for large-scale plants with large condensate volumes.
4.2.5.1 The location of the condensate pump station should be determined based on the distribution of users throughout the plant. When the condensate recovery volume is greater than 3000kg/h, a separate condensate pump station can be established. 4.2.5.2 When a condensate system has several condensate pump stations, the selection of condensate pumps should meet the requirements of parallel operation. 4.2.5.3 Two pumps should be set up in the condensate pump station, one of which is a standby. The flow rate of each condensate pump should meet the maximum condensate recovery volume per hour, and its head should be greater than the pressure loss of the condensate pipeline system, the lifting height from the pump station to the condensate tank, and the pressure of the condensate tank.
4.2.5.4 The condensate pump should be equipped with an automatic start and stop device. 4.2.6 When a steam trap booster (condensate automatic pump) is used as a booster pump, a steam trap should be installed on the condensate pipeline of each steam-using equipment. When the steam trap booster has both the functions of a steam trap and a booster pump, its installation position should be close to the steam-using equipment, and its upper water tank should be lower than the lowest point of the system.
4.2.7 For the two types of condensate that are easily polluted and not easily polluted, it is advisable to recycle them in separate systems.
5 Selection and calculation of main equipment in the system
5.1 Selection and calculation of steam traps
5.1.1 Selection principles of steam traps
5.1.1.1 The most suitable steam trap type should be selected according to its use conditions, installation location, and technical performance of the steam trap. 5.1.1.2 In the steam heating system of chemical enterprises, all steam-using points that produce condensate must be equipped with steam traps or other drainage facilities at their condensate outlets, and stop valves are not allowed to be used instead.
5.1.1.3 Steam traps or drainage facilities should be installed at the following points of steam pipelines or steam heating equipment.
(1) The end or lowest point of saturated steam pipes, the end or lowest point of steam tracing pipes.
(2) Before the pressure reducing valve and regulating valve of the steam system. (3) Dead ends where steam does not flow frequently, with the ear as the lowest point of the pipeline. (4) The lower part of steam cylinders (steam distribution pipes) and steam heating equipment. (5) The lowest point of the steam inlet pipe of equipment that is often in hot standby mode. (6) The lower part of the expansion tank and the lower part of the wave crest of the corrugated compensator. (7) Any place where frequent drainage is required.
(8) Start-up drain devices should be installed at the corresponding locations of the superheated steam network. 5.1.1.4 Steam traps should be selected as high-quality energy-saving steam traps that meet national standards. Their service life should be greater than or equal to 8000 hours and the steam leakage rate should be less than or equal to 0.3%. 5.1.1.5 Each steam-using equipment should be equipped with a separate steam trap. Equipment with different steam pressures are not allowed to share a steam trap.
5.1.1.6 When the amount of condensed water exceeds the maximum discharge capacity of a single steam trap, 6 steam traps of the same type can be selected and used in parallel.
5.1.1.7 All steam traps should be equipped with filters. If there is no filter, a filter should be installed in front of the valve.
5.1.1.8 When a steam trap failure may cause an accident in the steam system or chemical plant, a steam trap of the same type can be connected in parallel or a bypass valve can be installed as a backup. 5.1.1.9 The steam trap device should be equipped with a monitoring device. 5.1.1.10 Anti-freeze measures should be taken for steam traps installed outdoors in cold areas. 5.1.1.11 Select different types of steam traps and determine their specifications and quantity based on the condensate discharge volume of the trap, the actual working pressure difference between the inlet and outlet of the trap, and the maximum working back pressure of the steam trap.
(1) The nominal pressure and working temperature of the steam trap should be greater than or equal to the maximum working pressure and maximum working temperature of the steam pipeline and steam-using equipment. (2) Steam traps must be distinguished by type and selected according to their working performance, conditions and condensate discharge volume. The nominal diameter of the steam trap shall not be used as the basis for selection. (3) In the condensate recovery system, if the working back pressure is used to recover condensate, a steam trap with a higher back pressure rate (such as a mechanical steam trap) should be selected. (4) When it is required that condensate should not be accumulated in the steam-using equipment, a steam trap that can continuously discharge saturated condensate (such as a float-type steam trap) should be selected. (5) In the condensate recovery system, when the steam-using equipment requires both the discharge of saturated condensate and the timely discharge of non-condensable gases, a steam trap that can discharge saturated condensate and a steam trap connected in parallel with an exhaust device should be used, or a steam trap that has both drainage and exhaust functions (such as a thermostatic steam trap) should be used. (6) When the working pressure of the steam-using equipment fluctuates frequently, a steam trap that does not require adjustment of the working pressure should be selected.
5.1.2 Calculation of steam trap selection
5.1.2.1 Steam trap condensate discharge Gt=mG.
Gt—Steam trap condensate discharge, t/h; ww.bzsoso:com(5.1.2.1)3 Steam traps or drainage facilities should be installed at the following points of steam pipelines or steam heating equipment.
(1) The end or lowest point of the saturated steam pipe, the end or lowest point of the steam tracing pipe.
(2) Before the pressure reducing valve and regulating valve of the steam system. (3) Dead end where steam does not flow frequently, the ear is the lowest point of the pipeline. (4) The lower part of the steam cylinder (steam distribution pipe) and steam heating equipment. (5) The lowest point of the steam inlet pipe of the equipment that is often in hot standby state. (6) The lower part of the expansion tank and the lower part of the wave crest of the corrugated compensator. (7) Any place where frequent drainage is required.
(8) Start-up drain devices should be installed at the corresponding locations of the superheated steam pipeline network. 5.1.1.4 Steam traps should be selected as high-quality energy-saving steam traps that meet national standards. Their service life should be greater than or equal to 8000 hours and the steam leakage rate should be less than or equal to 0.3%. 5.1.1.5 Each steam-using equipment should be equipped with a separate steam trap. Equipment with different steam pressures are not allowed to share a steam trap.
5.1.1.6 When the condensate volume exceeds the maximum discharge volume of a single trap, 6
same type of traps can be selected for parallel use
5.1.1.7 Traps should all be equipped with filters. If not equipped with filters, filters should be installed in front of the valves.
5.1.1.8 When a steam trap failure may cause an accident in the steam system or chemical plant, a steam trap of the same type can be connected in parallel or a bypass valve can be installed as a backup. 5.1.1.9 Steam traps should be equipped with monitoring devices. 5.1.1.10 Antifreeze measures should be taken for outdoor installation of traps in cold regions. 5.1.1.11 According to the condensate discharge volume of the trap and the actual working pressure difference between the inlet and outlet of the trap, as well as the maximum working back pressure of the trap, select different types of steam traps and determine their specifications and quantities.
(1) The nominal pressure and operating temperature of the steam trap should be greater than or equal to the maximum operating pressure and maximum operating temperature of the steam pipeline and steam-using equipment. (2) Steam traps must be distinguished by type and selected according to their working performance, conditions and condensate discharge volume. The nominal diameter of the steam trap shall not be used as the basis for selection. (3) In the condensate recovery system, if the working back pressure is used to recover condensate, a steam trap with a higher back pressure rate (such as a mechanical steam trap) should be selected. (4) When it is required that condensate should not accumulate in the steam-using equipment, a steam trap that can continuously discharge saturated condensate (such as a float-type steam drain valve) should be selected. (5) In the condensate recovery system, when the steam-using equipment requires both the discharge of saturated condensate and the timely discharge of non-condensable gases, a steam trap that can discharge saturated condensate in parallel with an exhaust device should be used, or a steam trap that has both drainage and exhaust functions (such as a thermostatic steam trap) should be used. (6) When the working pressure of steam equipment fluctuates frequently, a steam trap that does not require adjustment of the working pressure should be selected.
5.1.2 Calculation of steam trap selection
5.1.2.1 Condensate discharge of steam trap Gt=mG.
Gt—Condensate discharge of steam trap, t/h; ww.bzsoso:com(5.1.2.1)3 Steam traps or drainage facilities should be installed at the following points of steam pipelines or steam heating equipment.
(1) The end or lowest point of the saturated steam pipe, the end or lowest point of the steam tracing pipe. bzxZ.net
(2) Before the pressure reducing valve and regulating valve of the steam system. (3) Dead end where steam does not flow frequently, the ear is the lowest point of the pipeline. (4) The lower part of the steam cylinder (steam distribution pipe) and steam heating equipment. (5) The lowest point of the steam inlet pipe of the equipment that is often in hot standby state. (6) The lower part of the expansion tank and the lower part of the wave crest of the corrugated compensator. (7) Any place where frequent drainage is required.
(8) Start-up drain devices should be installed at the corresponding locations of the superheated steam pipeline network. 5.1.1.4 Steam traps should be selected as high-quality energy-saving steam traps that meet national standards. Their service life should be greater than or equal to 8000 hours and the steam leakage rate should be less than or equal to 0.3%. 5.1.1.5 Each steam-using equipment should be equipped with a separate steam trap. Equipment with different steam pressures are not allowed to share a steam trap.
5.1.1.6 When the condensate volume exceeds the maximum discharge volume of a single trap, 6
same type of traps can be selected for parallel use
5.1.1.7 Traps should all be equipped with filters. If not equipped with filters, filters should be installed in front of the valves.
5.1.1.8 When a steam trap failure may cause an accident in the steam system or chemical plant, a steam trap of the same type can be connected in parallel or a bypass valve can be installed as a backup. 5.1.1.9 Steam traps should be equipped with monitoring devices. 5.1.1.10 Antifreeze measures should be taken for outdoor installation of traps in cold regions. 5.1.1.11 According to the condensate discharge volume of the trap and the actual working pressure difference between the inlet and outlet of the trap, as well as the maximum working back pressure of the trap, select different types of steam traps and determine their specifications and quantities.
(1) The nominal pressure and operating temperature of the steam trap should be greater than or equal to the maximum operating pressure and maximum operating temperature of the steam pipeline and steam-using equipment. (2) Steam traps must be distinguished by type and selected according to their working performance, conditions and condensate discharge volume. The nominal diameter of the steam trap shall not be used as the basis for selection. (3) In the condensate recovery system, if the working back pressure is used to recover condensate, a steam trap with a higher back pressure rate (such as a mechanical steam trap) should be selected. (4) When it is required that condensate should not accumulate in the steam-using equipment, a steam trap that can continuously discharge saturated condensate (such as a float-type steam drain valve) should be selected. (5) In the condensate recovery system, when the steam-using equipment requires both the discharge of saturated condensate and the timely discharge of non-condensable gases, a steam trap that can discharge saturated condensate in parallel with an exhaust device should be used, or a steam trap that has both drainage and exhaust functions (such as a thermostatic steam trap) should be used. (6) When the working pressure of steam equipment fluctuates frequently, a steam trap that does not require adjustment of the working pressure should be selected.
5.1.2 Calculation of steam trap selection
5.1.2.1 Condensate discharge of steam trap Gt=mG.
Gt—Condensate discharge of steam trap, t/h; ww.bzsoso:com(5.1.2.1)
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