GB/T 50655-2011 English PDFUS$1699.00 · In stock
Delivery: <= 10 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 50655-2011: Code for design of steam system in chemical plant Status: Valid
Basic dataStandard ID: GB/T 50655-2011 (GB/T50655-2011)Description (Translated English): Code for design of steam system in chemical plant Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: P72 Word Count Estimation: 77,746 Date of Issue: 2011-02-18 Date of Implementation: 2012-03-01 Quoted Standard: GB/T 12145; GB/T 1576; GB/T 2589-2008; GB 50049; " Steam Boiler Safety Technology Supervision" Regulation (derived from): Bulletin of the Ministry of Housing and Urban No. 934 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This standard applies to chemical pure steam heating systems, stand-alone capacity of 100MW and below thermoelectric (power) cogeneration steam system construction, reconstruction and expansion of the steam system design. GB/T 50655-2011: Code for design of steam system in chemical plant---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 In order to implement the "Energy Conservation Law of the People's Republic of China", implement the national energy industry policy, reduce the total energy consumption of the steam system, improve the design level of the steam system, and ensure the safety and reliability of the system, flexible operation, advanced technology and reasonable economy, this specification is formulated. 1.0.2 This code is applicable to the design of the steam system of the pure heat supply steam system of the chemical plant, and the steam system of the heat and power (power) cogeneration steam system with a unit capacity of 100MW or less. 1.0.3 The design of the steam system in chemical plants shall not only comply with this specification, but also comply with the current relevant national standards. 2 terms 2.0.1 steam system steam system In the production process of chemical plants, it is responsible for steam production, transportation, recovery and utilization of condensed water and process waste heat, providing thermal power, various devices and equipment connected in the form of steam or thermal energy, and with the help of a unified, Coordinated, balanced system. 2.0.2 steam users without used steam return Steam taken from the system cannot be returned to the user of the system in the form of steam after use. 2.0.3 steam users with used steam return The steam taken from the system can still return to the steam user in the form of steam after the parameters are changed after use. 2.0.4 heat users heat users The general term for gas consumers and gas users. 2.0.5 steam sources Fuel boilers, waste heat boilers, flash expansion vessels and other steam generating equipment, including external steam. 2.0.6 fuel-fired boilers Refers to boilers that burn gas, liquid, and solid fuels to generate steam. 2.0.7 heat recovery steam generators Use the heat generated in the industrial production process, gas turbine (power generation or work) exhaust heat, waste gas and waste combustion and other equipment to generate steam. 2.0.8 start-up boilers Boilers that provide steam for start-up of process units. 2.0.9 by-produced steam The steam produced by the industrial production process or the steam produced by the waste heat boiler. 2.0.10 Process residual heat process residual heat The abundant heat generated during the production process of the process unit. 2.0.11 heat consumption for power supply The system uses steam as power to directly drive steam turbines or reciprocating machines and other equipment to output heat energy consumed per kilowatt hour (kJ/kW·h). 2.0.12 heat consumption for electricity generation In the system, the steam turbine drives the generator to generate electric energy, and the heat energy (kJ/kW·h) consumed per kilowatt-hour electric energy (kW·h) output on the generator terminal. 2.0.13 heat consumption for heat supply The amount of fuel consumed by the heating system to provide 1GJ of heat is converted into standard coal. 2.0.14 annual utilization ratio The ratio of the annual utilization hours of equipment to the total statistical hours of the year. 3 Basic Regulations3.0.1 The system design should be based on various production conditions of process equipment, etc., to achieve safe operation, energy saving, environmental protection, flexible control, and convenient maintenance. 3.0.2 System parameters and grades should be based on design conditions such as process steam load, parameters, steam engine pumps and by-product steam, implement the principle of energy cascade utilization, combine the requirements of various working conditions in chemical production, and take into account the power equipment parameters. Determined after technical and economic comparison. 3.0.3 The steam turbine type, number, parameters and capacity of the driving machine pump shall be determined according to the requirements of steam balance, and its steam consumption shall be calculated. 3.0.4 The parameters and capacities of the steam boilers and start-up (auxiliary) boilers to be used in the system shall be selected and determined according to the steam balance calculation. 3.0.5 Utilization of waste heat According to the economical and reasonable demand of the steam system of the chemical plant, the way and means of waste heat utilization in the process equipment shall be determined. 3.0.6 The recovery and utilization of system steam condensate should be determined according to the needs and possibilities of the steam system of the chemical plant.4 System type and scale4.1 System type 4.1.1 When cogeneration of heat and electricity (power) cannot be implemented, a pure heating system should be used. 4.1.2 In the heating system of cogeneration of heat and power (work), the heating steam should be mainly supplied by the extraction and exhaust steam of the steam turbine generator set and (or) the steam turbine driving the process machine pump. 4.1.3 For the heating system including gas turbine, the gas turbine drives the generator or drives the compressor, and the exhaust gas of the gas turbine should be used for steam generated by the waste heat boiler to enter the system or be used as combustion air for the process heating furnace. 4.2 System Scale 4.2.1 The system is classified by capacity. 1 The total steam load of the steam system is less than or equal to 60t/h, and it should be a small system; 2 The total steam load of the steam system is 61t/h～200t/h, which should be a medium-sized system; 3 If the total steam load of the steam system is greater than.200t/h, it should be a large system. 4.2.2 Classified according to the nominal pressure grade of the highest-level main pipe in the system, it should meet the following requirements. 1 The steam pressure is less than 2.5MPa, it should be a low pressure system; 2 The steam pressure is 2.5MPa ~ 6.4MPa, which should be a medium pressure system; 3 The steam pressure is 6.5MPa～13.7MPa, which should be a high-pressure system; 4 If the steam pressure is greater than 13.7MPa, it should be an ultra-high pressure system.5 system composition5.0.1 The main components of the system shall include boiler room or thermal power station, auxiliary boiler or start-up boiler, waste heat, waste gas recovery, steam superheating device, steam transmission, distribution and balancing facilities, steam heat users, industrial steam turbine, heating steam turbine, water supply water removal Oxygen and condensate recovery systems, gas turbines, etc. 5.0.2 Steam consumers shall include the following categories. 1 The reaction steam used in the production process; 2 Steam for vacuum injection or material atomization; 3 Isolation and fire-fighting steam; 4 steam for direct heating; 5 steam for indirect heating; 6 Condensed steam from steam turbine exhaust; 7 Heating and domestic steam; 8 Steam supplied to the outside of the system; 9 insulation and heat tracing of materials; 10 steam reciprocating machine; 11 Pipe network loss. 5.0.3 Gas users shall include the following categories. 1.Back pressure or extraction back pressure steam turbine; 2 The steam extraction part of the steam extraction condensing steam turbine; 3 steam accumulator; 4 other gas users. 5.0.4 Steam generating equipment shall include the following types. 1 Fuel boilers shall include industrial boilers, utility boilers, start-up boilers, auxiliary boilers and steam superheating furnaces; 2 waste heat boiler; 3 Flash expansion vessel. 5.0.5 External steam should be steam from outside the steam system. 5.0.6 The water supply system shall include the following. 1 Make-up water and feed water heating; 2 Make-up water and condensed water deoxidize, and add medicine to water. 5.0.7 Condensate water, drainage recovery system and steam water quality monitoring facilities shall include the following contents. 1 Recovery, flash evaporation and cooling of condensed water; 2 Flash evaporation, recovery, cooling and discharge of boiler blowdown water; 3 Soda quality monitoring and sampling; 4 Hydrophobic. 5.0.8 System balancing facilities should include the following. 1 steam distributor; 2 pressure relief device; 3 desuperheating device; 4 temperature and pressure reduction device; 5 recirculation device, safety device; 6 Vent the unit. 5.0.9 The gas turbine and its exhaust gas utilization system shall include the following methods. 1 The gas turbine exhaust gas enters the process heating furnace; 2 Exhaust gas from the gas turbine enters the waste heat boiler.6 System design and steam balance diagram6.1 Proposed Basis 6.1.1 The system design should obtain the relevant documents that have been approved by the project. 6.1.2 The implemented external conditions of the system design shall meet the following requirements. 1 Information on fuel, transportation, water source, electricity, geology, meteorology, chemicals, safety and sanitation, energy conservation and environmental protection requirements; 2 The load conditions of the system shall include the following. 1) Process steam load and parameters can be filled in according to Table A.0.1 of this specification; 2) The characteristic data of the steam engine pump can be filled in according to Table A.0.2 of this specification; 3) By-product steam data can be filled in according to Table A.0.3 of this specification; 4) Annual utilization coefficient of steam consumption and steam-using equipment; 5) The original steam source; 6) Process waste heat data can be filled in according to Table A.0.4 of this specification; 7) Condensed water recovery data can be filled in according to Table A.0.5 of this specification; 8) Agreement on steam load and condensed water recovery with external cooperation. 6.1.3 The system design should obtain the characteristic data and charts of the main thermal equipment in the system. 6.2 System Design 6.2.1 The system should be equipped with steam boilers with the same parameters and capacity, and the parameters of the waste heat boiler should match the system parameters. 6.2.2 In addition to waste heat boilers and start-up boilers, the steam boilers installed in the system should generate steam with the highest pressure level in the system. 6.2.3 When supplying steam to continuous production process equipment, the steam source should not be equipped with a single coal-fired boiler, and the maintenance furnace should be installed according to the steam demand. 6.2.4 The pressure reduction and temperature reduction devices should be uniformly installed between the steam main pipes of various pressure levels in the system. The steam temperature at the outlet of the desuperheater should have an appropriate degree of superheat, and the temperature measuring point for adjustment should be set at a position greater than or equal to 10m behind the water spray point. Requirements for steam quality after desuperheating. There should be a spare set of decompression and temperature reduction devices or pressure reducing valves that are in frequent operation. 6.2.5 Condensed water from steam consumers should be fully recovered, and cascade flash evaporation should be carried out according to the pressure level for multiple uses. 6.2.6 For thermal deaerators, the upper limit of the inlet water temperature shall be 15°C to 25°C lower than the saturation temperature at the operating pressure of the deaerator. 6.2.7 The first-stage deaerator should be an atmospheric deaerator. The exhaust pipe of the deaerator should be equipped with a steam-water separator. 6.2.8 The system design should make full use of the waste heat at the middle and low temperatures to heat the deaerator make-up water and/or boiler feed water. 6.2.9 Steam supply, water supply and condensate water pipelines should adopt a single main pipe system. 6.2.10 Safety discharge devices shall be installed on the main steam pipes of each pressure level in the system. 6.2.11 The decompression and desuperheating device shall adopt hot standby. 6.3 Design of pure heating system 6.3.1 The load conditions of major steam consumers shall be obtained, and their reliability shall be verified. 6.3.2 System steam parameters should be determined according to process steam load and parameters, combined with steam parameters of steam source equipment and process waste heat conditions. 6.4 Design of cogeneration system of heat and power (power) 6.4.1 The system design should reasonably determine the steam parameters of the system according to the steam load and parameter requirements of each user in the system and the single machine power of the maximum capacity pump, combined with the steam parameters of the steam source equipment and the process waste heat conditions. 6.4.2 When determining the parameters of new steam, it is advisable to adopt new steam with higher parameters. 6.4.3 Each pressure level of the system shall be determined according to the process requirements and according to the adjustment range of the steam extraction and exhaust pressure of the steam turbine and the pipeline loss to the steam user. The number of pressure levels of the system should be reduced, the system with fresh steam pressure of medium pressure should not exceed three levels, and the system with new steam pressure of high pressure should not exceed level four. 6.4.4 Except for the main pipe with the highest pressure level, the steam volume required for the balance of the steam main pipes at other levels of the system should make full use of the by-product steam generated by the waste heat of the process equipment, and the insufficient part should be supplied or supplemented by the extraction and exhaust steam of the steam turbine. 6.4.5 The design of normal capacity and maximum capacity of the system shall meet the following requirements. 1 When determining the normal capacity of the system, the steam intake of the steam turbine can be calculated according to 100% to 105% of the designed shaft power of the pump of the driven machine, and the process steam load should be calculated according to the normal consumption proposed by the process; 2 When determining the maximum capacity of the system, the steam intake of the steam turbine can be calculated as 110% of the rated steam intake of the driven steam turbine, and the process steam load should be calculated according to the maximum consumption proposed by the process. 6.4.6 The selection of steam turbine drive shall meet the following requirements. 1 For the pumps with special requirements such as fire protection, explosion protection, speed regulation or high-speed direct connection, it is advisable to use steam turbine drive, and the drive of other pumps should be based on steam balance to determine whether to use steam turbine drive; 2 When the low-pressure steam user has a stable and continuous heat load of more than 4000 hours throughout the year, the back-pressure steam turbine can be used for steam supply; 3 In the case of a spare pump, it is advisable to use steam as the main pump and electric as backup; 2 60% to 75% of the heat used for heating and living in winter (the upper limit is taken in severe cold areas); 3 When the pump driven by the steam turbine is out of service, the standby pump driven by the electric motor is running, and the pump load should not be included; 4 Temporary steam consumption loads such as fire protection and blowing shall not be included. 7.0.2 The steam turbine parameters, type, shaft power and extraction and exhaust steam capacity shall meet the system's needs for power and steam load balance, and shall meet the following requirements. 1 Under normal working conditions, the steam turbine should be operated near the highest efficiency point of its operating diagram; 2 The steam turbine should not be used as the driving machine for perennial backup; 3 It is advisable to select industrial steam turbine drive pump. 7.0.3 The total capacity of the decompression and temperature reduction devices between the steam main pipes of each pressure level should be equal to the maximum steam supply volume of the steam main pipes of this pressure level. 7.0.4 The total capacity of the deaerator should be selected according to the maximum water consumption, and the design capacity should be determined according to 120% of the maximum consumption. The deaerator set in the system may not be set as a backup. 7.0.5 The effective total capacity of the deaeration water tank shall be set according to the following requirements. 1.The deoxygenated water below 35t/h should take the maximum water supply of 20min to 30min; 2 The deoxygenated water above 60t/h should take the maximum water supply of 10min to 20min. 7.0.6 The total capacity and number of feed water pumps shall ensure that when any continuously running feed water pump is out of service, the rest of the feed water pumps can supply the feed water required by all boilers in the connected system at the rated evaporation capacity, plus 110% of the water supply required by other users in the system. 7.0.7 The gas turbine system with simple cycle should not be used in the system. 7.0.8 The combined cycle gas turbine unit should be balanced and selected in combination with the chemical production unit and steam system, and the existing fixed gas turbine should be selected.8 System Control8.1 System control classification and requirements 8.1.1 Steam system controls can be classified as follows. 1 Control of the steam system of a single chemical plant; 2 Plant-wide steam system control for multiple units. 8.1.2 The control requirements of the steam system shall be determined according to factors such as the type of the steam system, safe production, energy saving, cost accounting, and various operating conditions. 8.2 Pressure control in the system 8.2.1 For the steam system, the corresponding pressure control system shall be designed according to the pressure regulation requirements of the main equipment or main devices in the system. 8.2.2 In order to ensure the stability of the steam main pipe pressure, the pressure adjustment and control design of the steam main pipe of each pressure level shall be based on the steam source entering the steam main pipe of each pressure level and whether there is a steam turbine (including the type used), starting and stopping, emergency treatment of large fluctuations in steam heat load during accidents, and other specific combination content, etc., shall be determined after optimization and shall meet the following requirements. 1 The following facilities should be installed on the parent pipe. 1) The pressure tracking adjustment of the adjustable main steam source entering the steam main pipe of each pressure level; 2) Vent regulating valve (both automatic control and remote control); 3) Spare decompression and temperature reduction devices between steam main pipes of various pressure levels. 2 A safety valve must be installed on the main pipe. 3 When there is only a low-pressure steam main pipe in the steam system, it is not necessary to set the vent regulating valve. 8.2.3 In a steam system with steam headers of multiple pressure levels, the pressure of the steam header with the highest pressure level should be automatically adjusted and controlled according to the pressure of the headers. 1 Fuel filling quantity of steam source equipment with external fuel; 2 The discharge volume of the vent regulating valve;......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 50655-2011_English be delivered?Answer: Upon your order, we will start to translate GB/T 50655-2011_English as soon as possible, and keep you informed of the progress. The lead time is typically 6 ~ 10 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 50655-2011_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 50655-2011_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay. |
