CN107120637A - A kind of throttle type is fixed, the switching system and method for Variable Speed Feedwater Pumps - Google Patents

A kind of throttle type is fixed, the switching system and method for Variable Speed Feedwater Pumps Download PDF

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Publication number
CN107120637A
CN107120637A CN201710389465.4A CN201710389465A CN107120637A CN 107120637 A CN107120637 A CN 107120637A CN 201710389465 A CN201710389465 A CN 201710389465A CN 107120637 A CN107120637 A CN 107120637A
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CN
China
Prior art keywords
feedwater
pressure
valve
pump
variable speed
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Pending
Application number
CN201710389465.4A
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Chinese (zh)
Inventor
郑扬帆
黄元平
陆培宇
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Guangdong Zhongshan Guangdong Power Plant Co Ltd
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Guangdong Zhongshan Guangdong Power Plant Co Ltd
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Application filed by Guangdong Zhongshan Guangdong Power Plant Co Ltd filed Critical Guangdong Zhongshan Guangdong Power Plant Co Ltd
Priority to CN201710389465.4A priority Critical patent/CN107120637A/en
Publication of CN107120637A publication Critical patent/CN107120637A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/02—Arrangements of feed-water pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/12—Cooling of plants
    • F02C7/14—Cooling of plants of fluids in the plant, e.g. lubricant or fuel
    • F02C7/141—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/12—Cooling of plants
    • F02C7/16—Cooling of plants characterised by cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems
    • F22D5/32—Automatic feed-control systems influencing the speed or delivery pressure of the feed pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

A kind of throttle type is fixed, the switching system and method for Variable Speed Feedwater Pumps, including low-pressure boiler gas bag, high-pressure boiler gas bag, constant speed feed pump, pressure balance regulating valve first pressure sensor, second pressure sensor, I/O interface modules, controller and DCS system, it is characterised in that：The outlet of the low-pressure boiler gas bag is connected with entrance of water-supplying pump stop valve, the other end of entrance of water-supplying pump stop valve is connected with the entrance of constant speed feed pump, the outlet of the constant speed feed pump is attached with feedwater pump discharge minimum discharge triple valve, and the feedwater pump discharge minimum discharge triple valve another two interface is connected with feedwater pump discharge minimum discharge non-return valve, feedwater pump discharge shutoff valve respectively.The present invention is switched over having effective and safe between Variable Speed Feedwater Pumps and constant speed feed pump, has ensured the pressure match problem in handoff procedure, improves the performance driving economy and operation safety of the overall unit of power plant.

Description

A kind of throttle type is fixed, the switching system and method for Variable Speed Feedwater Pumps
Technical field
The present invention relates to water pump switching device technical field, more particularly to a kind of throttle type is fixed, Variable Speed Feedwater Pumps are cut Change system and method.
Background technology
In combined-cycle power plant, the pressure and flow and unit load of boiler-steam dome feedwater are directly proportional relations, I.e. unit load increase when, the feed pressure and flow of boiler gas bag are consequently increased, when unit load is low, and furnace gas bag is given Water pressure and flow are also decreased, and the feed pressure perseverance that combustion engine aerial cooler needs is high level, such boiler gas bag Unmatched situation occurs in the feed pressure and flow of feed pressure and flow and combustion engine aerial cooler.According to high-power Variable Speed Feedwater Pumps be that combustion engine aerial cooler and boiler gas bag provide feedwater, but the speed adjustable range that Variable Speed Feedwater Pumps allow is narrow Narrow, when particularly unit is in low load condition operation, boiler-steam dome pressure is low, and drum feedwater flow restriction control loss is big, feedwater The energy-saving effect of pump speed changer is restricted, and unit operation is less economical, meanwhile, feed-regulating valve is chronically at small guide vane state Operation, accelerates the valve element degree of wear, reduces system reliability, threatens unit safety operation.At present, it is many using two feedwater Pump is improved between feedwater, but two pumps in mutual handoff procedure, it is also possible to feed pressure mismatch case occur, occur impact or Combustion engine aerial cooler feedwater interruption situation, causes the accidents such as pipeline strenuous vibration, unit tripping, it is therefore desirable to solve feed pump Security and reliability problem in handoff procedure.
The content of the invention
Present invention aim to address the problems of the prior art, there is provided a kind of throttle type is fixed, Variable Speed Feedwater Pumps switchings System and method, carries out handoff-security, it is ensured that stable operation of unit between constant speed feed pump and Variable Speed Feedwater Pumps.
The technical scheme is that：A kind of throttle type is fixed, the switching system and method for Variable Speed Feedwater Pumps, including low pressure cooker Furnace gas bag, high-pressure boiler gas bag, entrance of water-supplying pump stop valve, constant speed feed pump, feedwater pump discharge minimum discharge triple valve, feedwater Pump discharge minimum discharge non-return valve, feedwater pump discharge minimum discharge stop valve, feedwater pump discharge shutoff valve, feedwater water supplying pump check Valve, pressure balance regulating valve, the parallel stop valve that feeds water, the parallel non-return valve that feeds water, first pressure sensor, second pressure sensing Device, I/O interface modules, controller and DCS system, it is characterised in that：The entrance of water-supplying pump stop valve and low-pressure boiler gas bag Outlet be connected, the other end of entrance of water-supplying pump stop valve is connected with the entrance of constant speed feed pump, the constant speed feed pump Outlet is attached with feedwater pump discharge minimum discharge triple valve, the feedwater pump discharge minimum discharge triple valve another two interface It is connected respectively with feedwater pump discharge minimum discharge non-return valve, feedwater pump discharge shutoff valve, the feedwater pump discharge minimum discharge The reverse interface of non-return valve is connected with feedwater pump discharge minimum discharge stop valve, and the stop valve connection of feedwater pump discharge minimum discharge is another One end is connected with the entrance of low-pressure boiler gas bag；The forward interface of the feedwater pump discharge shutoff valve and feedwater water supplying pump non-return valve Connection, the other end of feedwater water supplying pump non-return valve is connected with being connected the pressure balance regulating valve of actuator, pressure balance regulation The other end of valve is connected with the inlet duct of combustion engine aerial cooler, the inlet duct of the combustion engine aerial cooler also with to The reverse interface of the parallel non-return valve of water is connected, and the other end for the parallel non-return valve that feeds water is connected with the parallel stop valve that feeds water, and gives The outlet connection of the parallel stop valve other end of water and Variable Speed Feedwater Pumps, the outlet of Variable Speed Feedwater Pumps also goes out with Variable Speed Feedwater Pumps successively Mouth minimum discharge non-return valve, Variable Speed Feedwater Pumps outlet minimum discharge stop valve, the entrance of high-pressure boiler gas bag are attached, high pressure Boiler gas bag is then connected to the entrance of Variable Speed Feedwater Pumps after being connected with Variable Speed Feedwater Pumps inlet stop valve, the Variable Speed Feedwater Pumps It is provided with outlet conduit at second pressure sensor, the inlet duct of the combustion engine aerial cooler and is additionally provided with first pressure Sensor；The entrance of water-supplying pump stop valve, constant speed feed pump, feedwater pump discharge shutoff valve, actuator, the parallel cut-off of feedwater Valve, first pressure sensor and second pressure sensor carry out circuit with I/O interface modules and are connected, the I/O interface modules It is connected with controller, controller and DCS system are attached.
Unit has just started or during in low load condition, and constant speed feed pump is in running status, and combustion engine aerial cooler enters Mouth pipeline pressure is high, and as unit load rises, controller receives second pressure sensor at high-pressure boiler drum feed pipe Pressure signal value and combustion engine aerial cooler inlet duct at first pressure sensor pressure signal value, when this pressure at two When force signal value is close, controller starts the changeover program for being fed water and being fed water to Variable Speed Feedwater Pumps from constant speed feed pump；Unit is from height During load reduction to underload or shutdown, constant speed feed pump is in halted state, and the feedwater of combustion engine aerial cooler is given by speed change Water pump is provided.As unit load is reduced, the Variable Speed Feedwater Pumps rotating speed of high-pressure high-flow declines, boiler-steam dome feed pressure Reduction, when controller detects combustion engine aerial cooler inlet line pressure and drops to certain value, startup is given by Variable Speed Feedwater Pumps The changeover program that water feeds water to constant speed feed pump.
Further, the constant speed feed pump is the feed pump of high-lift low discharge, and the rated pressure of constant speed feed pump is not The demand pressure fed water less than combustion engine aerial cooler, the metered flow of constant speed feed pump is not less than the feedwater of combustion engine aerial cooler Demand volume.
Further, the feedwater pump discharge shutoff valve is electronic automatic valve, is controlled by the controller and is turned on and off.
Further, the pressure balance regulating valve is automatic valve pneumatically or electrically, and valve opening is by actuator control System.
Beneficial effects of the present invention are：Determined using a kind of throttle type of the present invention, the mutual cutting system of speed-variable pump can be brought Following beneficial effect：
1st, when unit load is low, the rotating speed of high-lift big flow speed-variable pump can be reduced, feedwater pump power is effectively reduced, reduces Restriction loss, reduces station service power consumption rate, improves unit operation economy under underload.
2nd, when unit load is high, stop the operation of the constant speed feed pump of high-lift low discharge, reduce feedwater pump operation number Amount, improves the rate of load condensate of high-lift big flow Variable Speed Feedwater Pumps, improves feedwater the way, reduces station service power consumption rate, improves high The performance driving economy of overall unit under load.
3rd, can be by the water supply source safety of combustion engine aerial cooler when unit load changes from low to high or from high to low Reliably mutually switch between high-lift low discharge constant speed pump and high-lift big flow speed-variable pump, it is ensured that ensure in handoff procedure Unit safety operation.
4th, to maintain boiler-steam dome feed-regulating valve aperture to be in middle or high value, the valve element degree of wear is low, makes system It is more reliable.
5th, it can realize that high reliability automatically switches, the risk in reduction handoff procedure.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Wherein, 1- controllers, 2-I/O interface modules, 3- first pressures sensor, 4- combustion engine aerial cooler, 5- feedwater Parallel non-return valve, the parallel stop valve of 6- feedwater, 7- high-pressure boilers gas bag, 8- Variable Speed Feedwater Pumps, 9- second pressures sensor, 10- Pressure balance regulating valve, 11- feedwater water supplying pumps non-return valve, 12- feedwater pump discharge shutoff valve, 13- feedwater pump discharge minimum discharges Non-return valve, 14- feedwater pump discharge minimum discharges stop valve, 15- low-pressure boilers gas bag, 16- feedwater pump discharge minimum discharge threeways Valve, 17- constant speed feed pump, 18- entrance of water-supplying pump stop valve, 19-DCS systems, 20- actuators, the outlet of 21- Variable Speed Feedwater Pumps are most Low discharge non-return valve, 22- Variable Speed Feedwater Pumps outlet minimum discharge stop valve, 23- Variable Speed Feedwater Pumps inlet stop valves.
Embodiment
The embodiment to the present invention is described further below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of throttle type is fixed, the switching system of Variable Speed Feedwater Pumps, including low-pressure boiler gas bag 15, pressure cooker furnace gas Bag 7, entrance of water-supplying pump stop valve 18, constant speed feed pump 17, feedwater pump discharge minimum discharge triple valve 16, feedwater pump discharge are minimum Flow non-return valve 13, feedwater pump discharge minimum discharge stop valve 14, feedwater pump discharge shutoff valve 12, feedwater water supplying pump non-return valve 11st, pressure balance regulating valve 10, the parallel stop valve 6 that feeds water, the parallel non-return valve 5 of feedwater, first pressure sensor 3, second pressure Sensor 9, I/O interface modules 2, controller 1 and DCS system 20, it is characterised in that：The entrance of water-supplying pump stop valve 18 with it is low The outlet of pressure boiler gas bag 15 is connected, and the other end of entrance of water-supplying pump stop valve 18 is connected with the entrance of constant speed feed pump 17, The outlet of the constant speed feed pump 17 is attached with feedwater pump discharge minimum discharge triple valve 16, and the feedwater pump discharge is minimum The another two interface of flow triple valve 16 is connected with feedwater pump discharge minimum discharge non-return valve 13, feedwater pump discharge shutoff valve 12 respectively Connect, the reverse interface of the feedwater pump discharge minimum discharge non-return valve 13 is connected with feedwater pump discharge minimum discharge stop valve 14, Feedwater pump discharge minimum discharge stop valve 14 connects the other end and is connected with the entrance of low-pressure boiler gas bag 15；The feedwater pump discharge Stop valve 12 is connected with the forward interface for the water supplying pump non-return valve 11 that feeds water, and the other end of feedwater water supplying pump non-return valve 11 is held with being connected The pressure balance regulating valve 10 of row device 20 is connected, the other end of pressure balance regulating valve 10 and entering for combustion engine aerial cooler 4 Mouthful pipeline is connected, and the reverse interface of the inlet duct of the combustion engine aerial cooler 4 also with the parallel non-return valve 5 that feeds water is connected Connect, the other end for the parallel non-return valve 5 that feeds water is connected with the parallel stop valve 6 that feeds water, feed water the parallel other end of stop valve 6 and speed change The outlet connection of feed pump 8, the outlet of Variable Speed Feedwater Pumps 8 also exports minimum discharge non-return valve 21 with Variable Speed Feedwater Pumps successively, become Speed feedwater pump discharge minimum discharge stop valve 22, the entrance of high-pressure boiler gas bag 7 are attached, high-pressure boiler gas bag 7 and speed change Entrance of water-supplying pump stop valve 23 is then connected to after connecting at the entrance of Variable Speed Feedwater Pumps 8, the outlet conduit of the Variable Speed Feedwater Pumps 8 It is provided with second pressure sensor 9, the inlet duct of the combustion engine aerial cooler 4 and is additionally provided with first pressure sensor 3； The entrance of water-supplying pump stop valve 18, constant speed feed pump 17, feedwater pump discharge shutoff valve 12, actuator 20, the parallel cut-off of feedwater Valve 6, first pressure sensor 3 and second pressure sensor 9 carry out circuit with I/O interface modules 2 and are connected, the I/O interfaces Module 2 is connected with controller 1, controller 1 is attached with DCS system 19.
Unit has just started or during in low load condition, and constant speed feed pump 17 is in running status, combustion engine aerial cooler 4 Inlet line pressure is high, as unit load rises, and controller 1 receives second pressure at the feed pipe of high-pressure boiler drum 7 and passed The pressure signal value of sensor and the pressure signal value of first pressure sensor at the inlet duct of combustion engine aerial cooler 4, when this two When the pressure signal value at place is close, controller 1 starts the switching journey for being fed water and being fed water to Variable Speed Feedwater Pumps 8 from constant speed feed pump 17 Sequence；Unit from high load capacity be reduced to underload or shutdown when, constant speed feed pump 17 be in halted state, combustion engine aerial cooler 4 Feedwater provided by Variable Speed Feedwater Pumps 8.As unit load is reduced, the rotating speed of Variable Speed Feedwater Pumps 8 of high-pressure high-flow declines, pot The reduction of stove drum feed pressure, when controller 1 detects the inlet line pressure of combustion engine aerial cooler 4 and drops to certain value, Start the changeover program for being fed water and being fed water to constant speed feed pump 17 from Variable Speed Feedwater Pumps 8.
A kind of throttle type is fixed, the switching method of Variable Speed Feedwater Pumps, the constant speed feed pump 17 feed water to Variable Speed Feedwater Pumps 8 to The transfer process of water, comprises the following steps：
The detection Variable Speed Feedwater Pumps 8 of S11 controllers 1 outlet pressure sensor 11, combustion engine aerial cooler inlet pressure transducer 12 Pressure parameter, slowly turned down while sending signal control pressure balance regulating valve 10；
Pressure at the inlet duct of S12 combustion engine aerial cooler 4 is with slow turn down of the pressure balance regulating valve 10 of throttle type Reduction, when controller detects the pressure at the inlet duct of combustion engine aerial cooler 4, that is to say that first pressure sensor 3 is obtained Pressure value, no longer turned down and when reducing with the slow of pressure balance regulating valve 10 of throttle type, illustrate combustion engine aerial cooler Feedwater start simultaneously provided by the Variable Speed Feedwater Pumps 8 of original constant speed feed pump 17 and high-lift big flow, now, DCS systems Unite 19 recording status a11；
S13 when controller 1 detect the speed change of pressure and high-lift big flow at the inlet duct of combustion engine aerial cooler 4 to When pressure is close at the outlet conduit of water pump 8, be first pressure sensor obtain pressure value obtained with second pressure sensor When the pressure value taken is close, illustrate that the feedwater of combustion engine aerial cooler switches to high-lift big flow via constant speed feed pump 17 Speed-variable pump is provided, now, the recording status a of DCS system 1912；
S14 DCS systems 19 send signal to controller 1, and constant speed feed pump 17 is stopped transport, after stoppage in transit, and constant speed feed pump 17 is in Stand-by state, system completes to switch to the whole program of speed-variable pump feedwater by constant speed pump.
A kind of throttle type is fixed, the switching method of Variable Speed Feedwater Pumps, the Variable Speed Feedwater Pumps 8 feed water to constant speed feed pump 17 to The transfer process of water, comprises the following steps：
S21 DCS systems 19 send signal to controller 1, and controller control turns down pressure balance regulating valve 10 to compared with small guide vane After value, start constant speed feed pump 17；
The pressure value of the second pressure sensor 9 in the monitoring Variable Speed Feedwater Pumps 8 of S22 controllers 1 exit, combustion engine aerial cooler The pressure value of the first pressure sensor 12 of porch, controls to cause the aperture of pressure balance regulating valve 10 to delay while sending signal Slow increase；
S23 is when the aperture of pressure balance regulating valve 10 reaches certain value, the first pressure at combustion engine aerial cooler inlet duct The pressure value of sensor start with pressure balance regulating valve 10 aperture increase and raise, illustrate combustion engine aerial cooler to Water, which starts to switch to constant speed feed pump 17 by Variable Speed Feedwater Pumps 8, to be provided, now, the recording status a of DCS system 1921；
S24 further opens the aperture of pressure balance regulating valve 10 completely, and first at combustion engine aerial cooler inlet duct When the pressure value of pressure sensor is more than the pressure value of the second pressure sensor at the outlet conduit of Variable Speed Feedwater Pumps 8, illustrate combustion The feedwater of machine aerial cooler switches to constant speed feed pump 17 by Variable Speed Feedwater Pumps 8 completely and provided, now, system record shape State a22, system complete by Variable Speed Feedwater Pumps be switched to constant speed feed pump feedwater switch operating.
Further, the constant speed feed pump 17 is the feed pump of high-lift low discharge, the specified pressure of constant speed feed pump 17 Power is not less than the demand pressure of the feedwater of combustion engine aerial cooler 4, and it is cold that the metered flow of constant speed feed pump 17 is not less than combustion engine air But the demand volume that device 4 feeds water.
Further, the feedwater pump discharge shutoff valve 12 is electronic automatic valve, and the controlled control of device 1 is opened or closed Close.
Further, the pressure balance regulating valve 10 is automatic valve pneumatically or electrically, and valve opening is by actuator Control.
Described above is only presently preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention Within god and principle, any modification, equivalent substitution and improvements done etc., according to and our identical spirit and principle should This is considered as the present invention all should be within protection scope of the present invention.

Claims (5)

1. a kind of throttle type is fixed, the switching system of Variable Speed Feedwater Pumps, including low-pressure boiler gas bag, high-pressure boiler gas bag, feed pump Inlet stop valve, constant speed feed pump, feedwater pump discharge minimum discharge triple valve, feedwater pump discharge minimum discharge non-return valve, feedwater Pump discharge minimum discharge stop valve, feedwater pump discharge shutoff valve, feedwater water supplying pump non-return valve, pressure balance regulating valve, feedwater are simultaneously Row stop valve, the parallel non-return valve of feedwater, first pressure sensor, second pressure sensor, I/O interface modules, controller and DCS System, it is characterised in that：The entrance of water-supplying pump stop valve is connected with the outlet of low-pressure boiler gas bag, entrance of water-supplying pump cut-off The other end of valve is connected with the entrance of constant speed feed pump, outlet and the feedwater pump discharge minimum discharge threeway of the constant speed feed pump Valve is attached, the feedwater pump discharge minimum discharge triple valve another two interface respectively with feedwater pump discharge minimum discharge check Valve, feedwater pump discharge shutoff valve are connected, reverse interface and the feedwater pump discharge of the feedwater pump discharge minimum discharge non-return valve Minimum discharge stop valve is connected, and the entrance of the feedwater pump discharge minimum discharge stop valve connection other end and low-pressure boiler gas bag connects Connect；The feedwater pump discharge shutoff valve is connected with the forward interface for the water supplying pump non-return valve that feeds water, the another of water supplying pump non-return valve of feeding water One end is connected with being connected the pressure balance regulating valve of actuator, the other end and the combustion engine aerial cooler of pressure balance regulating valve Inlet duct be connected, the reverse interface of the inlet duct of the combustion engine aerial cooler also with the parallel non-return valve that feeds water is connected Connect, the other end for the parallel non-return valve that feeds water is connected with the parallel stop valve that feeds water, the parallel stop valve other end that feeds water is given with speed change Also fed water successively with Variable Speed Feedwater Pumps outlet minimum discharge non-return valve, speed change the outlet connection of water pump, the outlet of Variable Speed Feedwater Pumps Pump discharge minimum discharge stop valve, the entrance of high-pressure boiler gas bag are attached, high-pressure boiler gas bag and Variable Speed Feedwater Pumps entrance It is then connected to after stop valve connection at the entrance of Variable Speed Feedwater Pumps, the outlet conduit of the Variable Speed Feedwater Pumps and is provided with second pressure First pressure sensor is additionally provided with sensor, the inlet duct of the combustion engine aerial cooler；The entrance of water-supplying pump is cut Only valve, constant speed feed pump, feedwater pump discharge shutoff valve, actuator, the parallel stop valve that feeds water, first pressure sensor and second are pressed Force snesor carries out circuit with I/O interface modules and is connected, and the I/O interface modules are connected with controller, controller and DCS systems System is attached.
2. throttle type according to claim 1 is fixed, the switching system of Variable Speed Feedwater Pumps, it is characterised in that：The constant speed is given Water pump is the feed pump of high-lift low discharge, and the rated pressure of constant speed feed pump is not less than the demand of combustion engine aerial cooler feedwater Pressure, the metered flow of constant speed feed pump is not less than the demand volume of combustion engine aerial cooler feedwater.
3. throttle type according to claim 1 is fixed, the switching system of Variable Speed Feedwater Pumps, it is characterised in that：The feed pump Outlet shutoff valve is electronic automatic valve, and is controlled by the controller and is turned on and off.
4. throttle type according to claim 1 is fixed, the switching system of Variable Speed Feedwater Pumps, it is characterised in that：The pressure is put down The regulating valve that weighs is automatic valve pneumatically or electrically, and its valve opening is by actuator control.
5. a kind of throttle type is fixed, the switching method of Variable Speed Feedwater Pumps, it is characterised in that：
The constant speed feed pump feeds water the method fed water to Variable Speed Feedwater Pumps, comprises the following steps：
S11 controllers detection Variable Speed Feedwater Pumps outlet pressure sensor, the pressure of combustion engine aerial cooler inlet pressure transducer Parameter, is slowly turned down while sending signal control pressure balance regulating valve；
S12 controllers persistently detect the pressure at combustion engine aerial cooler inlet duct, that is to say that first pressure sensor is obtained Pressure value, until pressure at combustion engine aerial cooler inlet duct is no longer turned down and subtracted with the slow of pressure balance regulating valve It is small, now, DCS system recording status a11；
S13 controllers are detected and pressed at the inlet duct of combustion engine aerial cooler at the outlet conduit of pressure and Variable Speed Feedwater Pumps When power is close, when being the pressure value and the close pressure value of second pressure sensor acquisition that first pressure sensor is obtained, this When, DCS system recording status a12；
S14 DCS systems read state a12Backward controller sends signal, constant speed is fed water pump shutdown, and make constant speed feed pump In stand-by state, system completes to switch to the whole program of speed-variable pump feedwater by constant speed pump；
Transfer process between the Variable Speed Feedwater Pumps feedwater and the feedwater of constant speed feed pump, comprises the following steps：
S21 DCS systems send signal to controller, and controller control pressure balance regulating valve is turned down to after compared with small guide vane value, opened Dynamic constant speed feed pump；
The pressure value of the second pressure sensor in S22 monitoring control devices Variable Speed Feedwater Pumps exit, combustion engine aerial cooler entrance The pressure value of the first pressure sensor at place, while the aperture for sending signal control pressure balance regulating valve slowly increases；
The pressure value that S23 controllers start to read the first pressure sensor at combustion engine aerial cooler inlet duct starts When being raised with the aperture increase of pressure balance regulating valve, now, DCS system recording status a21；
S24 controllers continue control pressure balance adjustment valve opening and opened completely, when controller reads combustion engine aerial cooler The pressure value of first pressure sensor at inlet duct is more than the second pressure sensor at Variable Speed Feedwater Pumps outlet conduit During pressure value, now, system recording status a22, system complete by Variable Speed Feedwater Pumps be switched to constant speed feed pump feedwater switching work Make.
CN201710389465.4A 2017-05-27 2017-05-27 A kind of throttle type is fixed, the switching system and method for Variable Speed Feedwater Pumps Pending CN107120637A (en)

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CN112483425A (en) * 2020-12-11 2021-03-12 中国电力工程顾问集团西北电力设计院有限公司 Constant-speed water supply pump pressure regulating device and operation method

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