英文版dlt5054-1996火力发电厂汽水管道设计技术规定

英文版dlt5054-1996火力发电厂汽水管道设计技术规定内容摘要：

ystem. The pipeline at the condensate booster pump outlet side of the twostage pump system shall adopt the sum of the pump lifts of two pumps (condensate pump and condensate booster pump) when the outlet is shut down. (10) Heater39。 s drainage pipe It shall be times of the extraction pressure under the steam turbine39。 s maximal design capacity operating condition and shall be no lower than . When the drainage static pressure inside the pipeline triggers the pressure lifting and makes it larger than 3% of the extraction pressure, the influence of the static pressure shall be taken into account. (11) Boiler water blowdown pipeline Before the boiler blowdown valve or when the pipeline after the blowdown valve is equipped with valve or closure plate that can elevate the pipe internal pressure, the design pressure for the periodic blowdown pipeline shall be no smaller than the sum of the undermost setpressure of all the safety valves on the steam drum and the water column static pressure from the steam drum39。 s maximum water level to the pipe coupling points。 as for the continuous blowdown pipeline, the design pressure shall be no lower than the undermost setpressure of all the safety valves on the steam drum. If the pipe internal pressure will not go up after the boiler blow down valve, the design pressure of the blowdown line (periodic blowdown or continuous blowdown) shall be selected from Table . Table : The piping design pressure after the boiler blowdown valve [MPa (g)] Boiler pressure ~ ~ ~ ≥ Piping design pressure (12) Feedwater recirculation line When the unit system is taken, the last stop valve entering the deaerator and the previous pipeline shall take the design pressure of corresponding high pressure feed water pipe。 for 11 pipeline after the stop valve, the constant voltage deoxidizing system shall take the rated pressure of the deaerator。 for the sliding pressure operation of deaerator, the design pressure shall be times of the deaerator39。 s heatup extraction pressure at the maximal design capacity operating condition of the steam turbine. When the pipingmain scheme system is adopted, the restriction orifice and its previous pipeline shall adopt the design pressure of corresponding high pressure feed water pipe。 for pipeline after the restriction orifice, when no valve is installed or valve on the media double outlets cannot be closed at the same time, the deaerator39。 s rated pressure shall be adopted. (13)Exhaust pipe after the safety valve It shall be determined according to the hydraulic calculation result of the blowdown pipe. Design temperature It refers to the maximal working temperature of the media inside the pipe. The design temperature for the main pipe shall be selected according to the following specifications: (1) Main steam line It shall take the steam39。 s rated working temperature at the outlet of the boiler superheater plus the allowable temperature deviation during the boiler39。 s normal operation. Suggested temperature deviation is 5℃ . (2) Reheat steam pipeline High temperature reheat pipe shall take the steam rated working temperature at the boiler reheater outlet plus the allowable temperature deviation during the boiler39。 s normal operation. Suggested temperature deviation is 5℃ . Lowtemperature reheat pipe shall adopt the high pressure cylinder steam exhaust parameter under the steam turbine39。 s maximal design capacity operating condition。 get the isentropic corresponding temperature under the piping design pressure. If the manufacturer has special requirements, the design temperature shall take the maximal possible working temperature. (3) Steam turbine39。 s extraction line Nonregulated extraction line take the extraction steam parameter under the steam turbine39。 s maximal design capacity operating condition and calculate the corresponding temperature by constant entropy under the design pressure of the pipeline。 12 Regulated extraction line takes the maximal working temperature of the exhaust gas. (4) Blowdown line of the backpressure steam turbine Steam exhaust39。 s maximal working temperature shall be taken. (5) Steam pipe after temperature reducing device The steam39。 s maximal working temperature at the temperature reducing device outlet shall be taken. (6) Aerated water pipeline connected to the monopipe boiler starting vessel The maximal possible working temperature that the pipeline can have during all segregator operation conditions shall be taken. (7) High pressure feed water pipeline The maximal working temperature of the high pressure feed water after using the high pressure heater. (8) Low voltage feedwater piping For the constant voltage deaerator system, the corresponding saturation temperature of the deaerator39。 s rated pressure shall be taken. As for the sliding pressure deaerator system, times of the corresponding saturation temperature of the heated extraction pressure at the steam turbine39。 s maximal design capacity operating condition shall be taken. (9) Condensate pipe Maximal working temperature of the condensation water after the low pressure heater shall be taken. (10) Drainage pipe of the heater The corresponding saturation temperature according to the heater extraction line39。 s design pressure shall be taken. (11) Boiler water blowdown pipe Pipeline before the boiler blowdown valve or after the blowdown valve installed with valve or closure plate, when the valve or closure plate can elevate the pipe internal 13 pressure, the design temperature of the blowdown line (periodic blowdown or continuous blowdown) shall take the corresponding saturation temperature according to the undermost setpressure for all steam drums‘ safety valves. If the pipe internal pressure does not rise after the boiler blowdown valve, t。