DL/T 608-2019 English PDFUS$599.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. DL/T 608-2019: Guide of operation for 300MW～600MW grade steam turbine Status: Valid DL/T 608: Historical versions
Basic dataStandard ID: DL/T 608-2019 (DL/T608-2019)Description (Translated English): Guide of operation for 300MW��600MW grade steam turbine Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: F23 Classification of International Standard: 27.100 Word Count Estimation: 26,230 Date of Issue: 2019 Date of Implementation: 2019-10-01 Issuing agency(ies): National Energy Administration DL/T 608-2019: Guide of operation for 300MW～600MW grade steam turbine---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.Guide of operation for 300MW～600MW grade steam turbine ICS 27.100 F 23 People's Republic of China Electric Power Industry Standard Replace DL/T 608-1996, DL/T 609-1996 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration Table of contentsForeword...IV 1 Scope...1 2 Normative references...1 3 General...1 4 Steam Turbine Startup...1 4.1 Start-up method division...2 4.2 Conditions for startup...2 4.3 Cold start...3 4.4 Warm start...4 4.5 Hot start...5 4.6 Extremely hot start...5 4.7 Requirements during start-up of steam turbine...5 5 Steam Turbine Operation...6 5.1 Normal operation...6 5.2 Special operation...7 6 Outage of Steam Turbine...7 6.1 Normal shutdown...7 6.2 Emergency stop...8 6.3 Outage exception handling...9 6.4 Maintenance after shutdown...9 7 Steam Turbine Test...10 7.1 Test before starting...10 7.2 Test during startup...10 7.3 Tests in operation...11 8 Operation of Main Auxiliary Equipment of Steam Turbine...12 8.1 Condensate pump...12 8.2 Feedwater pump set...12 8.3 Circulating water pump...12 8.4 Condenser...12 8.5 Cooling tower and air cooling island...13 8.6 High and low pressure heaters...13 8.7 Deaerator...14 8.8 Bypass system...14 8.9 Lubricating oil system...14 8.10 EH oil system...14 8.11 Jack shaft oil system...15 9 Steam turbine accident prevention and treatment...15 9.1 Basic requirements for accident handling...15 9.2 Prevention and treatment of typical accidents...15 Appendix A (Normative Appendix) Main protection, monitoring parameters and control devices of steam turbine...24 Appendix B (informative appendix) Demonstration curve diagram of steam turbine startup and shutdown...27ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation". Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This standard replaces DL/T 608-1996 "Operation Guidelines for.200MW Steam Turbine" and DL/T 609-1996 "Operation Guidelines for 300MW Steam Turbine". The main differences in technical content from DL/T 608-1996 and DL/T 609-1996 are. - Increase the scope of use; --Updated normative reference documents; -Revised the division of steam turbine start-up methods and the required conditions; --Updated steam turbine steam, water and oil quality control standards; --Added the conditions and treatment for the emergency shutdown of the steam turbine which destroys the vacuum and the emergency shutdown without destroying the vacuum. - Cancel the forced cooling after the steam turbine stops; --Revised the test items and requirements of steam turbines, and clarified the test items before start-up after A, B, C, and D level overhaul. --The operation of main auxiliary machinery of steam turbines such as condensate pump, low-pressure heater, cooling tower, air cooling island, and lubricating oil pump has been added. -Revised the prevention and treatment of steam turbine accidents. This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the Steam Turbine Guidelines Technical Committee of the Electric Power Industry. Drafting organizations of this standard. Tianjin Datang International Panshan Power Generation Co., Ltd., Guangdong Datang International Chaozhou Power Generation Co., Ltd. The main drafters of this standard. He Shuai, Yang Kaili, Liu Dongming, Qian Jun, Li Dacai, Jin Rifeng, Li Jianyong, Zhang Yanbin, Li Xinpeng. This standard was first issued in.1996, and this is the first revision. The opinions or suggestions in the implementation of this guideline are fed back to the China Electricity Council’s Guideline Management Center (No. 2 Baiguang Road, Beijing) One, 100761). Operation Guidelines for 300MW～600MW Steam Turbines1 ScopeThis standard specifies the principled technologies for the startup, operation, shutdown, testing, accident prevention and handling of 300MW～600MW steam turbines Requirements and methods of operation. This standard applies to 300MW class subcritical, supercritical and 600MW class subcritical, supercritical and ultra-supercritical thermal power steam turbines, 125MW class, 200MW-class thermal power steam turbines can be implemented by reference.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) is applicable to this standard. GB/T 5578 Specification for steam turbines for stationary power generation GB/T 7596 Quality Guidelines for Turbine Oil in Power Plant Operation GB/T 11120 Turbine Oil GB/T 11348.2 Mechanical vibration measures and evaluates machine vibration on rotating shafts GB/T 12145 Water and Vapor Quality of Thermal Power Generating Sets and Steam Power Equipment DL/T 571 Operation and maintenance guidelines for phosphate ester fire-resistant oil used in power plants DL/T 705 Quality guidelines for sealing oil for hydrogen-cooled generators in operation DL/T 711 Steam Turbine Regulation and Control System Test Guide DL/T 834 Guidelines for Preventing Water Ingress and Cold Steam for Steam Turbines in Thermal Power Plants DL/T 863 Steam Turbine Start-up Commissioning Guidelines DL/T 956 Guidelines for anti-corrosion of thermal equipment for shutdown (standby) in thermal power plants DL/T 1052 Energy-saving technical supervision guidelines DL/T 1270 Unit load rejection test guidelines for thermal power generation construction projects3 GeneralIn accordance with the relevant provisions of this standard, combined with the relevant technical documents issued by the manufacturer, when compiling the on-site operating procedures, if the manufacturer has If it is specified, it shall be implemented in accordance with the manufacturer’s provisions; if the manufacturer does not specify it, it shall be in accordance with this standard (including relevant provisions of the cited documents of this standard) The regulations are implemented.4 Turbine start4.1 Startup method division 4.1.1 Divided according to the cylinder steam intake mode at startup. a) High pressure cylinder starts When starting, the main steam directly enters the high-pressure cylinder of the steam turbine for impulse rotation, and the medium-pressure main steam valve and the regulating valve are fully opened, and it does not participate in the speed regulation of the steam turbine. b) Combined start of high and medium pressure cylinders When starting, the steam enters the high and medium pressure cylinder at the same time for impulse rotation, the middle main door is fully opened and the middle adjustment door participates in the adjustment. The pressure of the hot steam is within the normal range. c) Start of medium pressure cylinder When starting, the steam does not pass through the high-pressure cylinder, and the reheated steam directly enters the middle-pressure cylinder of the steam turbine for flushing, and the high-pressure cylinder is usually controlled by a ventilation valve. When the temperature rises to a certain value or the grid is connected to a certain load, it will switch to the high-pressure cylinder for steam intake. 4.1.2 Divide according to the surface temperature of the steam turbine cylinder or rotor before starting. The temperature division should be carried out according to the manufacturer's regulations. DL/T 863 implementation, generally divided into. a) Cold start. the metal temperature is lower than 40% of the metal temperature at full load or the metal temperature is lower than 150℃～180℃; b) Warm start. 40%～80% of the metal temperature when the metal temperature is at full load or the metal temperature is lower than 180℃～350℃; c) Hot start. if the metal temperature is higher than 80% of the metal temperature at full load or the metal temperature is higher than 350℃, it is divided into hot start (350℃～450℃) and extremely hot start (over 450℃). 4.1.3 Divided according to the length of downtime after the last operation. According to GB/T 5578, a typical start-up classification is given, which can be used as a reference. a) Cold start. stop for more than 72h (the metal temperature has dropped below about 40% of its full load temperature, in °C); b) Warm start. stop for 10h～72h (metal temperature is about 40%～80% of its full load temperature, unit ℃); c) Hot start. stop for less than 10h (metal temperature is about 80% of its full load temperature, unit ℃); d) Extremely hot start. within 1h after the unit trips (the metal temperature remains at or close to its full load temperature, in °C). 4.2 Conditions for startup 4.2.1 The system should have the following conditions. a) The steam turbine systems and equipment are in good condition, the valve positions are correct, and the transmission is normal; b) The quality of steam, water and oil is qualified; c) The instrumentation, sound and light alarm, equipment status and parameters of the thermal control device are displayed normally, and the main protection of the unit is normally put into operation; d) The DCS system is working normally. 4.2.2 All the tests before start-up are qualified. 4.2.3 The cranking is operating normally. The continuous cranking time shall be in accordance with the relevant regulations of the manufacturer. Generally, the cranking shall be operated continuously before the cold start. 2～4h, hot start is no less than 4h, if cranking is interrupted, time should be restarted. 4.2.4 The shaft seal steam supply and condenser vacuum system shall meet the following requirements. a) The rotor is in the cranking state and supplies steam to the shaft seal; b) The shaft seal supply and return steam pipes are fully drained and warmed; c) The fan of the shaft seal heater is running to ensure that the shaft seal heater is in a slight negative pressure state; d) The temperature of the high, medium and low pressure shaft seal supply steam should match the metal surface temperature of the rotor shaft seal section and should not exceed the deviation allowed by the manufacturer value; e) For hot start, the shaft seal should be put into operation before vacuuming; f) A proper condenser vacuum should be established and maintained before flushing. 4.2.5 The bypass system shall meet the following requirements. a) Before using the bypass system, confirm that the automatic, interlocking, and protection are normal and in the operating state; b) When the bypass system is used, the steam flow of the control high and medium pressure cylinders should be matched to meet the different working conditions of the high pressure cylinder and the medium and low pressure cylinders. Minimum cooling flow rate. 4.2.6 In one of the following situations (not limited to), it is forbidden to impulse or merge the steam turbine into the power grid. a) The major equipment defect has not been eliminated or the maintenance work ticket that affects the start of the unit has not been terminated; b) Thermal work or electrical protection is not put in; c) Failure of the tachometer; d) The speed control system cannot maintain the steam turbine idling or the dynamic rise speed after load rejection exceeds the overspeed protection action value; e) High and medium pressure main valve, speed control valve, high-pressure cylinder exhaust check valve, and any extraction check valve in the heat recovery system are not closed tightly or jammed Or malfunction; f) The emergency security device does not operate normally; g) Any accidental trip protection of the steam turbine fails. Refer to Appendix A1 for the accident trip protection that steam turbines should generally have; h) Any main control parameter of the steam turbine loses monitoring or any main regulation control device fails. The main monitoring parameters of steam turbine See Appendix A2, the main regulating and control devices generally equipped with steam turbines, see Appendix A3; i) The main engine lubricating oil system, EH oil system, sealing oil system, jack shaft oil system related equipment failure or the failure of the self-starting device; j) The temperature difference between the upper and lower cylinders of the high and medium pressure cylinders exceeds the manufacturer's regulations; k) The shaking value of the large shaft exceeds the manufacturer's specified value or the original value of ±0.02mm; l) The cranking device fails, the cranking does not move or the cranking current exceeds the limit; m) There is a clear metal friction sound or other abnormal sound in the static part of the steam turbine; n) The axial displacement and differential expansion exceed the specified value; o) Unqualified steam, water and oil quality; p) The compressed air system of plant instruments is not working properly; q) DEH, MEH, CCS and other thermal control systems are not working properly; r) The vibration of the unit exceeds the specified value; s) The generators, main transformers, and factory transformers fail to pass the test; t) The operator station is abnormal; u) Insufficient insulation of main equipment and pipelines. 4.3 Cold start 4.3.1 Selection of flushing parameters When the steam turbine is started, the pressure and temperature of the main and reheated steam in front of the main valve shall meet the requirements specified by the manufacturer. The superheat of the main and reheated steam Not lower than 56°C. 4.3.2 Turbine impulse rotation 4.3.2.1 After the steam turbine is impulsive, confirm that the cranking device is normally disconnected. 4.3.2.2 Carry out brake friction test according to the manufacturer's requirements during the impulse rotation process, carefully listen to the internal sound of the steam turbine, confirm the flow part and The oil damper has no friction and the oil return of each bearing is normal. At the same time, it is confirmed that the steam turbine interlocking action is normal, then the speed can be increased. The rate of rise is set according to the manufacturer’s requirements Set, generally 100r/min/min. 4.3.2.3 The warm-up time, warm-up speed, and warm-up temperature shall be carried out according to the start-up curve provided by the manufacturer. See Appendix B for the typical start-up curve. During the warm-up process, pay attention to controlling the temperature of main steam, reheat steam and shaft seal steam. It is strictly forbidden for the turbine expansion difference to exceed the specified value, and the heating shall be evaluated through the cylinder expansion. Machine effect. 4.3.2.4 The parameters such as the differential expansion, vibration, bearing bush temperature, lubricating oil pressure and oil temperature, steam and metal wall temperature, etc. of the unit shall be monitored during the impulse rotation process. When the specified value is exceeded, the brake should be switched on immediately. 4.3.2.5 The steam turbine rushes to 3000 r/min and runs stably. After a comprehensive inspection, the relevant tests shall be carried out according to the manufacturer's requirements. 4.3.3 With load 4.3.3.1 After the grid is connected to the grid, the engine is warmed up with the initial load, and the initial load is applied according to the startup curve provided by the manufacturer and the warm-up time is guaranteed. 4.3.3.2 Strictly control the rate of load increase and the rate of change of main and reheat steam parameters in accordance with the requirements of the startup curve. 4.3.3.3 Increase the load to the specified value, and confirm that the corresponding traps of each part of the unit should be closed. 4.3.3.4 Check and confirm steam turbine vibration, cylinder expansion, differential expansion, axial displacement, bearing metal temperature, exhaust steam temperature, oil temperature and oil pressure, Main monitoring parameters such as steam temperature are in the normal range. 4.3.3.5 The high and low pressure heaters should be started and put into operation in a random group. When the extraction steam pressure of the deaerator is higher than the internal pressure of the deaerator, it can overcome When the static pressure is caused by the height difference, the heating steam source of the deaerator should be switched to the extraction steam in this section. 4.4 Warm start 4.4.1 During the start-up process of the unit, the shaft seal should be put on first and then vacuumed. The impulse parameters are strictly determined in accordance with the start-up curve provided by the manufacturer. 4.4.2 See 4.3 for other startup requirements. 4.5 Hot start 4.5.1 Selection of flushing parameters When the steam turbine is started in a hot state, the impulse parameters are determined according to the cylinder temperature according to the starting curve provided by the manufacturer. 4.5.2 Precautions for flushing, grid connection and loading. a) The main and reheat steam pipes are fully drained; b) The rate of rise is set according to the manufacturer's requirements, generally controlled at 100～300r/min/min; c) After the fixed speed is checked, it should be connected to the grid as soon as possible; d) After connecting to the grid, the load should be carried as soon as possible in accordance with the requirements of the startup curve to ensure that the parameters of the steam turbine body do not exceed the specified values; e) The control main and reheat steam parameters are stable and do not exceed the specified value. 4.5.3 See 4.4 for other startup requirements. 4.6 Extremely hot start 4.6.1 The impulse parameters are determined strictly according to the starting curve provided by the manufacturer, and the load is increased rapidly according to the starting curve after grid connection. Strictly monitor the parameters of the steam turbine body not to exceed the specified values. 4.6.2 See 4.5 for other startup requirements. 4.7 Requirements during the start of steam turbine 4.7.1 If the cranking device cannot be disconnected in time after the steam turbine rotates, it should be switched on and stopped immediately. 4.7.2 Stop the jacking shaft oil pump at the speed of the turbine specified by the manufacturer. 4.7.3 In the event of abnormal vibration of the steam turbine, the speed cannot be increased forcibly. The cause must be investigated and eliminated before the speed can be increased again. 4.7.4 The critical speed should be passed quickly and smoothly, and the speed should not stay within this range. 4.7.5 Keep the steam parameters stable during startup, and control the temperature rise rate of the cylinder metal to be ≤2.5°C/min, and the temperature drop rate to be ≤1.5°C/min. 4.7.6 The change in the expansion value of the monitoring cylinder during startup should be uniform, and the warm-up time should be extended or solutions should be studied when the sliding pin system is stuck. 4.7.7 The outlet oil temperature of the oil cooler should be adjusted and controlled at 38～45℃ after the impulse and during operation (the unit using No. 46 turbine oil should be controlled at 45～50℃), the oil return temperature of each bearing bush is normal; the outlet oil temperature of the fire-resistant oil cooler should be controlled at 40±5℃. 4.7.8 The water spray co......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of DL/T 608-2019_English be delivered?Answer: Upon your order, we will start to translate DL/T 608-2019_English as soon as possible, and keep you informed of the progress. 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