CN210740372U - Large-scale generating set high back pressure steam-driven feed pump control system - Google Patents
Large-scale generating set high back pressure steam-driven feed pump control system Download PDFInfo
- Publication number
- CN210740372U CN210740372U CN201921379178.6U CN201921379178U CN210740372U CN 210740372 U CN210740372 U CN 210740372U CN 201921379178 U CN201921379178 U CN 201921379178U CN 210740372 U CN210740372 U CN 210740372U
- Authority
- CN
- China
- Prior art keywords
- steam
- pump
- pressure
- water
- measuring device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The utility model belongs to the technical field of power generation engineering and control thereof, in particular to a high-back-pressure steam-driven feed pump control system of a large-scale generator set, which comprises a high-back-pressure steam-driven feed pump set, an electric feed pump set, a condenser, a low-pressure heater, a steam header, a deaerator, a condensate pump, a vacuum pump, a monitoring system, a pressure measuring device, a temperature measuring device, a flow measuring device, a pipeline and a valve; the utility model discloses reduce equipment quantity, improved equipment operating efficiency to the acting capacity of the steam turbine exhaust of make full use of drive steam-driven feed-water pump emits latent heat of vaporization with the steam extraction condensation, improves the flexibility of energy utilization efficiency and equipment control.
Description
Technical Field
The utility model relates to a power generation engineering and control technology field, concretely relates to large-scale generating set high back pressure steam-operated feed pump control system.
Background
The large condensing steam turbine generator set mostly adopts a boiler water supply mode of 2 steam feed pumps and 1 electric feed pump, a single steam feed pump running generator set can carry 50% of rated load, two steam feed pump running generator sets can carry 100% of rated load, and the corresponding electric feed pump unit can carry 30% or 50% of rated load. The boiler in the form has multiple water supply modes and devices, large overhauling and maintaining workload and large occupied plant area; the steam turbine driving the steam feed water pump has small capacity and low efficiency, and the exhaust steam is directly discharged into the condenser, so that the condenser is required to have large capacity and high corresponding investment.
Disclosure of Invention
In order to solve the problem, the utility model provides a large-scale generating set high back pressure steam-operated feed pump control system has reduced equipment quantity, has improved equipment operating efficiency to the latent heat of vaporization is emitted with the steam extraction condensation to make full use of the acting ability of the steam turbine exhaust of drive steam-operated feed pump, improves the flexibility of energy efficiency and equipment control. The specific technical scheme is as follows:
a large-scale generating set high back pressure steam-operated feed pump control system, including boiler, high pressure cylinder, intermediate pressure cylinder, low pressure cylinder I, low pressure cylinder II, generator, also include high back pressure steam-operated feed pump group, electronic feed pump group, condenser, low-pressure heater, steam header, deaerator, condensate pump, vacuum pump, monitoring system, pressure measuring apparatus, temperature measuring apparatus, flow measuring apparatus and pipeline, valve;
the high-back-pressure steam-driven water feed pump set comprises a high-back-pressure steam-driven water feed pump steam turbine, a steam-driven water feed pump and a first front pump; the high-backpressure steam-driven water-feeding pump steam turbine and the steam-driven water-feeding pump are coaxial and are rigidly connected through a coupler; the first pre-pump is used for increasing the water supply pressure and preventing the impeller of the steam-driven water supply pump from being damaged by cavitation caused by vaporization of high-temperature water supply entering the steam-driven water supply pump; the outlet of the steam feed pump is connected with a check valve of the steam feed pump, and the check valve is used for preventing the steam feed pump from being damaged due to water backflow; the high-back-pressure steam-driven water-feeding pump steam turbine is connected with the low-pressure heater through a steam-pump steam turbine steam-exhaust steam-inlet low-pressure-adding check valve and a steam-pump steam turbine steam-exhaust steam-inlet low-pressure-adding regulating valve in sequence; the high-back-pressure steam-driven water-feeding pump steam turbine is connected with the low-pressure cylinder II through a steam-pump steam turbine steam-exhaust steam-inlet low-pressure cylinder check valve and a steam-pump steam turbine steam-exhaust steam-inlet low-pressure cylinder regulating valve in sequence;
the electric water feed pump set comprises a variable frequency motor, an electric water feed pump and a second front pump; the variable frequency motor and the second pre-pump are respectively connected with the electric water feeding pump, the second pre-pump boosts the pressure of the feed water and then injects the boosted feed water into the electric water feeding pump, and the second pre-pump is used for boosting the pressure of the feed water and preventing the cavitation damage of an impeller of the electric water feeding pump caused by the vaporization of the high-temperature feed water entering the electric water feeding pump; an outlet of the electric feed pump is provided with an electric feed pump check valve for preventing the electric feed pump from being damaged due to water backflow;
the steam feed pump check valve and the electric feed pump check valve are respectively connected with the boiler through the high-pressure heater and the boiler water level regulating valve in sequence;
the high-pressure cylinder is connected with the steam header through a high-pressure cylinder steam exhaust check valve, a boiler reheater cold section pipe steam extraction check valve and a header regulating valve in sequence;
the intermediate pressure cylinder is connected with the steam header through an intermediate pressure cylinder steam exhaust pipe steam extraction check valve and an intermediate pressure cylinder steam exhaust steam extraction regulating valve in sequence;
the steam header is connected with the high-back-pressure steam-driven feed pump steam turbine sequentially through a main steam valve of the steam-driven feed pump steam turbine and a steam-driven feed pump steam turbine regulating valve; the steam supply source of the steam header has two paths, one path is from the extraction steam of the cold section of the boiler reheater, and the other path is from the extraction steam of the intermediate pressure cylinder; a steam source of the steam header is used as a power steam source of a high-back-pressure steam-driven water-feeding pump steam turbine;
the steam header is connected with the condenser through a drain pipeline and a drain regulating valve; the boiler is connected with the condenser through a low-pressure bypass valve; the low-pressure cylinder I and the low-pressure cylinder II are respectively connected with a condenser; the vacuum pump is connected with the condenser and used for pumping out non-condensed gas in a steam chamber of the condenser so as to improve the vacuum of the condenser; the desalting water tank is connected with the condenser sequentially through a condensed water replenishing stop valve and a condensed water replenishing valve;
the condenser is connected with the low-pressure heater through the condensate pump and the condensate pump check valve in sequence; the condensate pump pumps out condensate water in the condenser and sends the condensate water into the low-pressure heater, the condensate water enters the low-pressure heater and is heated, and the latent heat of vaporization of the exhaust steam condensation of the high-back-pressure steam-driven water-feeding pump steam turbine is fully absorbed; the condensate pump check valve is used for preventing the condensate pump from being damaged due to water backflow;
the heater is connected with the deaerator through a deaerator water level regulating valve; the steam-driven water feeding pump is connected with the deaerator through a steam-driven water pump recirculation regulating valve; the electric water feed pump is connected with the deaerator through the electric water feed pump recirculation regulating valve; the deaerator is connected with the second front pump and the first front pump through a feed pump inlet stop valve;
the pressure measuring device comprises a cold section steam pressure measuring device, an intermediate pressure cylinder steam exhaust pressure measuring device, a header pressure measuring device, a steam pump outlet pressure measuring device, an electric water feeding pump outlet pressure measuring device and a water feeding main pipe pressure measuring device;
the temperature measuring device comprises a cold section steam temperature measuring device, an intermediate pressure cylinder exhaust steam temperature measuring device and a header temperature measuring device;
the cold-section steam pressure measuring device and the cold-section steam temperature measuring device are respectively arranged at a connecting pipeline between the high-pressure cylinder steam exhaust check valve and the boiler reheater cold-section pipe steam extraction check valve; the intermediate pressure cylinder exhaust steam pressure measuring device and the intermediate pressure cylinder exhaust steam temperature measuring device are respectively arranged at a connecting pipeline between the intermediate pressure cylinder and the steam exhaust pipe steam extraction check valve of the pressure cylinder; the header pressure measuring device and the header temperature measuring device are respectively arranged at the steam header and are respectively used for measuring the pressure and the temperature of steam in the steam header; the steam pump outlet pressure measuring device is arranged at the outlet of the steam feed water pump; the outlet pressure measuring device of the electric feed pump is arranged at the outlet of the electric feed pump; the pressure measuring device of the water supply main pipe is arranged on a pipeline connecting the check valve of the steam feed pump and the check valve of the electric feed pump with the high-pressure heater;
the flow measuring device comprises a condensate pump water outlet flow measuring device, a steam feed pump water inlet flow measuring device and an electric feed pump water inlet flow measuring device; the condensed water pump water outlet flow measuring device is arranged on a pipeline connecting the condensed water pump and the condensed water pump check valve; the device for measuring the inflow water flow of the steam-driven feed pump is arranged on a pipeline connecting the first pre-pump and the steam-driven feed pump; the device for measuring the inflow water flow of the electric feed pump is arranged on a pipeline connecting the second pre-pump and the electric feed pump;
the pressure measuring device, the temperature measuring device and the flow measuring device are respectively connected with the monitoring system.
Preferably, the steam header further comprises an overpressure safety valve, the overpressure safety valve is connected with the steam header, the overpressure safety valve serves as an overpressure protection device of the steam header, and when the overpressure safety value is exceeded, the overpressure safety valve depressurizes empty exhaust steam to prevent overpressure damage of the steam header.
Preferably, the low-pressure heater is a tubular heat exchanger, the inner side of the heat exchange tube is provided with condensed water, the outer side of the heat exchange tube is provided with steam exhausted by a high-back-pressure steam feed water pump turbine driving a steam feed water pump and steam extracted by a low-pressure cylinder I and a low-pressure cylinder II, and the exhausted steam enters the low-pressure heater to be condensed and then flows into the condenser.
Preferably, the intermediate pressure cylinder is connected with the deaerator sequentially through the intermediate pressure cylinder steam exhaust port steam extraction and oxygen removal device check valve and the intermediate pressure cylinder steam exhaust port steam extraction and oxygen removal device regulating valve.
Preferably, the system further comprises a condensate pump recirculation regulating valve; and the condensate pump recirculation regulating valve is respectively connected with the condenser and the condensate pump check valve.
Preferably, the temperature measuring means comprises a type E thermocouple.
Preferably, the pressure measuring device comprises an EJA series pressure transmitter.
Preferably, the flow measuring device comprises a throttle orifice plate and an EJA series flow differential pressure transmitter.
The utility model has the advantages that: the utility model solves the problems of the traditional boiler water supply mode, such as more equipment, large workload of overhaul and maintenance, and occupied plant area; the steam turbines driving the steam feed water pumps are large in number, so that the single turbine is small in capacity and low in efficiency, exhaust steam of the steam turbines is directly exhausted into the condenser, the condenser is required to be large in capacity, corresponding investment is high, and the like. The utility model discloses only adopt single steam pump steam turbine, its capacious efficiency is high, the equipment quantity has been reduced, the heat load of condenser has been alleviateed, the high back pressure steam feed pump steam turbine steam extraction of drive steam feed pump gets into big steam turbine, big steam turbine steam extraction flow has been increased, the blast air overtemperature damage that big steam turbine probably caused because of through-flow steam flow is few has been reduced, and make full use of's high back pressure steam feed pump steam turbine exhaust's the acting capacity and the latent heat of vaporization that the steam extraction condensation emits, the flexibility of energy efficiency and equipment control is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
wherein, 1-intermediate pressure cylinder exhaust steam pressure measuring device, 2-intermediate pressure cylinder exhaust steam temperature measuring device, 3-intermediate pressure cylinder exhaust steam pipe steam extraction check valve, 4-intermediate pressure cylinder exhaust steam extraction regulating valve, 5-boiler reheater cold section pipe steam extraction check valve, 6-header regulating valve, 7-desalted water tank, 8-overpressure safety valve, 9-steam header, 10-header pressure measuring device, 11-header temperature measuring device, 12-hydrophobic regulating valve, 13-low pressure bypass valve, 14-condensed water replenishing stop valve, 15-condensed water replenishing valve, 16-vacuum pump, 17-condenser, 18-condensed water pump, 19-condensed water pump outlet water flow measuring device, 20-condensed water pump check valve, 21-condensed water pump recirculation regulating valve, 22-steam-driven feed-water pump turbine main steam valve, 23-steam-driven feed-water pump turbine regulating valve, 24-high back pressure steam-driven feed-water pump turbine, 25-steam-driven pump turbine steam exhaust inlet low-pressure adding check valve, 26-steam-driven pump turbine steam exhaust inlet low-pressure adding regulating valve, 27-low pressure heater, 28-steam-driven pump turbine steam exhaust inlet low-pressure cylinder regulating valve, 29-steam-driven pump turbine steam exhaust inlet low-pressure cylinder check valve, 30-first front pump, 31-steam-driven feed-water pump water inlet flow measuring device, 32-steam-driven feed pump, 33-steam-driven pump outlet pressure measuring device, 34-steam-driven feed-water pump check valve, 35-feed-water pump inlet stop valve, 36-second front pump, 37-electric feed-water pump water inlet flow measuring device, 38-electric feed-water pump, 39-electric feed-water pump outlet pressure measuring device, 40-electric feed pump check valve, 41-water supply main pipe pressure measuring device, 42-intermediate pressure cylinder steam exhaust port steam extraction and oxygen removal device check valve, 43-intermediate pressure cylinder steam exhaust port steam extraction and oxygen removal device regulating valve, 44-oxygen removal device, 45-variable frequency motor, 46-electric feed pump recirculation regulating valve, 47-steam driven water pump recirculation regulating valve, 48-oxygen removal device water level regulating valve, 49-high pressure heater, 50-boiler water level regulating valve, 51-boiler reheater cold section pipe steam extraction and oxygen removal device regulating valve, 52-boiler reheater cold section pipe steam extraction and oxygen removal device check valve, 53-high pressure cylinder steam extraction check valve, 54-high pressure bypass valve, 55-boiler, 56-high pressure regulating valve, 57-intermediate pressure regulating valve, 58-cold section steam pressure measuring device, 59-cold section steam temperature measuring device.
Detailed Description
For a better understanding of the present invention, the following further description is made in conjunction with the accompanying drawings and the specific embodiments:
as shown in fig. 1, a high-back-pressure steam-driven feed pump control system for a large-scale generator set comprises a boiler 55, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder I, a low-pressure cylinder II, a generator, a high-back-pressure steam-driven feed pump set, an electric feed pump set, a condenser 17, a low-pressure heater 27, a steam header 9, a deaerator 44, a condensate pump 18, a vacuum pump 16, a monitoring system, a pressure measuring device, a temperature measuring device, a flow measuring device, a pipeline and a valve;
the high back pressure steam-driven water feed pump set comprises a high back pressure steam-driven water feed pump turbine 24, a steam-driven water feed pump 32 and a first front pump 30; the high back pressure steam-driven feed water pump turbine 24 and the steam-driven feed water pump 32 are coaxial and are rigidly connected through a coupler; the first pre-pump 30 is used for increasing the feed water pressure and preventing the impeller of the steam feed water pump 32 from cavitation damage caused by vaporization of high-temperature feed water entering the steam feed water pump 32; the outlet of the steam feed pump 32 is connected with a steam feed pump check valve 34 for preventing the steam feed pump 32 from being damaged due to water backflow; the high-back-pressure steam-driven water-feeding pump turbine 24 is connected with the low-pressure heater 27 through a steam-pump turbine steam-exhaust steam-inlet low-pressure-adding check valve 25 and a steam-pump turbine steam-exhaust steam-inlet low-pressure-adding regulating valve 26 in sequence; the high-back-pressure steam-driven water-feeding pump turbine 24 is connected with the low-pressure cylinder II through a steam-pump turbine steam-exhaust steam-inlet low-pressure cylinder check valve 29 and a steam-pump turbine steam-exhaust steam-inlet low-pressure cylinder regulating valve 28 in sequence;
the electric water feed pump group comprises a variable frequency motor 45, an electric water feed pump 38 and a second front pump 36; the variable frequency motor 45 and the second pre-pump 36 are respectively connected with the electric feed pump 38, the second pre-pump 36 boosts the feed water and injects the boosted feed water into the electric feed pump 38, and the second pre-pump 36 is used for boosting the feed water pressure and preventing the impeller cavitation damage of the electric feed pump 38 caused by the vaporization of the high-temperature feed water entering the electric feed pump 38; an outlet of the electric feed pump 38 is provided with an electric feed pump check valve 40 for preventing the electric feed pump 38 from being damaged due to water backflow;
the steam feed pump check valve 34 and the electric feed pump check valve 40 are respectively connected with a boiler 55 through a high-pressure heater 49 and a boiler water level regulating valve 50 in sequence;
the high-pressure cylinder is connected with the steam header 9 through a high-pressure cylinder steam exhaust check valve 53, a boiler reheater cold section pipe steam extraction check valve 5 and a header regulating valve 6 in sequence;
the intermediate pressure cylinder is connected with the steam header 9 through an intermediate pressure cylinder steam exhaust pipe steam extraction check valve 3 and an intermediate pressure cylinder steam exhaust steam extraction regulating valve 4 in sequence;
the steam header 9 is connected with a high-back-pressure steam feed pump turbine 24 through a steam feed pump turbine main steam valve 22 and a steam feed pump turbine regulating valve 23 in sequence; the steam supply source of the steam header 9 has two paths, one path is from the extraction of steam at the cold section of the boiler reheater, and the other path is from the extraction of steam discharged by the intermediate pressure cylinder; the steam source of the steam header 9 is used as a power steam source of a high-back-pressure steam-driven water-feeding pump steam turbine 24;
the steam header 9 is connected with a condenser 17 through a drain pipeline and a drain regulating valve 12; the boiler 55 is connected with the condenser 17 through a low-pressure bypass valve 13; the low-pressure cylinder I and the low-pressure cylinder II are respectively connected with a condenser 17; the vacuum pump 16 is connected with the condenser 17 and is used for pumping out non-condensed water in a steam chamber of the condenser 17 and improving the vacuum of the condenser 17; the desalting water tank 7 is connected with a condenser 17 sequentially through a condensed water replenishing stop valve 14 and a condensed water replenishing valve 15;
the condenser 17 is connected with the low-pressure heater 27 through the condensate pump 18 and the condensate pump check valve 20 in sequence; the condensate pump 18 pumps out the condensate in the condenser 17 and sends the condensate into the low-pressure heater 27, the condensate enters the low-pressure heater 27 and is heated, and the latent heat of vaporization of the exhaust steam of the high-back-pressure steam-driven water-feeding pump turbine 24 is fully absorbed; the condensate pump check valve 20 is used for preventing the condensate pump 18 from being damaged due to water backflow;
the heater 27 is connected with the deaerator 44 through a deaerator water level regulating valve 48; the steam-driven water feed pump 32 is connected with the deaerator 44 through a steam-driven water pump recirculation regulating valve 47; the electric feed pump 38 is connected with the deaerator 44 through an electric feed pump recirculation regulating valve; the deaerator 44 is connected with the second pre-pump 36 and the first pre-pump 30 through the feed pump inlet stop valve 35;
the main steam pipe of the boiler is connected with the high-pressure cylinder through a high-pressure regulating valve 56; the high-pressure cylinder is connected with the cold section of the boiler reheater through a high-pressure cylinder steam exhaust check valve 53; the high-pressure cylinder is connected with the deaerator 44 sequentially through a high-pressure cylinder steam exhaust check valve 53, a boiler reheater cold section pipe steam extraction and oxygen removal device check valve 52 and a boiler reheater cold section pipe steam extraction and oxygen removal device regulating valve 51;
the hot section of the boiler reheater is connected with an intermediate pressure cylinder through an intermediate pressure regulating valve 57; the low pressure cylinder II is connected with a generator;
the high-pressure bypass valve 54 is respectively connected with the main steam pipe and the cold section of the boiler reheater;
the pressure measuring device comprises a cold section steam pressure measuring device 58, an intermediate pressure cylinder steam exhaust pressure measuring device 1, a header pressure measuring device 10, a steam pump outlet pressure measuring device 33, an electric water feeding pump outlet pressure measuring device 39 and a water feeding main pipe pressure measuring device 41;
the temperature measuring device comprises a cold section steam temperature measuring device 59, an intermediate pressure cylinder exhaust steam temperature measuring device 2 and a header temperature measuring device 11;
the cold-section steam pressure measuring device 58 and the cold-section steam temperature measuring device 59 are respectively arranged at the connecting pipeline between the high-pressure cylinder steam exhaust check valve 53 and the boiler reheater cold-section pipe steam extraction check valve 5; the intermediate pressure cylinder exhaust steam pressure measuring device 1 and the intermediate pressure cylinder exhaust steam temperature measuring device 2 are respectively arranged at the connecting pipeline between the intermediate pressure cylinder and the steam cylinder exhaust pipe steam extraction check valve 3; the header pressure measuring device 10 and the header temperature measuring device 11 are respectively arranged at the steam header 9 and are respectively used for measuring the pressure and the temperature of the steam in the steam header 9; the steam pump outlet pressure measuring device 33 is arranged at the outlet of the steam feed water pump 32; the electric feed water pump outlet pressure measuring device 39 is arranged at the outlet of the electric feed water pump 38; the water supply main pipe pressure measuring device 41 is arranged on a pipeline connecting the steam feed pump check valve 34, the electric feed pump check valve 40 and the high-pressure heater 49;
the flow measuring device comprises a condensate pump outlet water flow measuring device 19, a steam feed pump inlet water flow measuring device 31 and an electric feed pump inlet water flow measuring device 37; the condensed water pump water outlet flow measuring device 19 is arranged on a pipeline connecting the condensed water pump 18 and the condensed water pump check valve 20; the inflow water flow measuring device 31 of the steam feed pump is arranged on a pipeline connecting the first pre-pump 30 and the steam feed pump 30; the inflow water measuring device 37 of the electric feed pump is arranged on a pipeline connecting the second pre-pump 36 and the electric feed pump 38;
the pressure measuring device, the temperature measuring device and the flow measuring device are respectively connected with the monitoring system. The monitoring system adopts an OVATION decentralized control system.
The high-back-pressure steam-driven feed water pump control system of the large generator set further comprises an overpressure safety valve 8, the overpressure safety valve 8 is connected with the steam header 9, the overpressure safety valve 8 serves as an overpressure protection device of the steam header 9, and when the overpressure safety valve 8 exceeds a pressure safety value, the pressure of air exhaust steam is reduced so as to prevent the steam header 9 from being damaged by overpressure.
The low-pressure heater 27 is a tubular heat exchanger, condensed water is arranged on the inner side of the heat exchange tube, the steam is exhausted by the high-back-pressure steam feed water pump turbine 24 for driving the steam feed water pump 32 and the steam is extracted by the low-pressure cylinder I and the low-pressure cylinder II, and the exhausted steam enters the low-pressure heater 27 to be condensed and then flows into the condenser 17.
The intermediate pressure cylinder is connected with the deaerator 44 through the intermediate pressure cylinder steam exhaust port steam extraction steam inlet deaerator check valve 42 and the intermediate pressure cylinder steam exhaust port steam extraction steam inlet deaerator regulating valve 43 in sequence.
The high back pressure steam-driven feed pump control system of the large generator set also comprises a condensate pump recirculation regulating valve 21; and the condensate pump recirculation regulating valve 21 is respectively connected with the condenser 17 and the condensate pump check valve 20.
Wherein the temperature measuring device comprises an E-type thermocouple. The pressure measuring device comprises an EJA series pressure transmitter. The flow measuring device comprises a throttling orifice plate and an EJA series flow differential pressure transmitter. The condensate pump 18 adopts an NLT350-400 multiplied by 6 type cylindrical bag type vertical multistage centrifugal pump; the vacuum pump 16 adopts a 2BW 4353-OMK 4-Z type liquid ring vacuum pump; the high-pressure regulating valve 56 and the medium-pressure regulating valve 57 adopt hydraulic actuating mechanisms; the condensate pump recirculation regulating valve 21, the electric feed pump recirculation regulating valve 46 and the steam-driven water pump recirculation regulating valve 47 adopt steam-driven regulating valves; the high-pressure bypass valve 54 and the low-pressure bypass valve 13 adopt hydraulic actuating mechanisms, and other regulating valves adopt electric regulating valves; the stop valve is a corrugated pipe stop valve; the check valve adopts a stainless steel horizontal check valve.
Taking engineering application of a 300 MW-grade subcritical, single intermediate reheating and two-cylinder two-exhaust-gas unit as an example, the model of a steam turbine is N300-16.7-537/537-8 (high-middle-pressure combined cylinder), and basic parameters of the steam turbine of the generator set are shown in Table 1. A steam-driven feed water pump, which meets the 100% maximum continuous evaporation water supply requirement (100% BMCR) of the boiler; an electric feed pump, which meets the requirement of 50% of the maximum continuous evaporation water supply (1 × 50% BMCR) of a boiler.
TABLE 1 basic parameters of steam turbine of generator set
TABLE 2 basic parameters of electric feed pump set
TABLE 3 basic parameters of the steam feed pump group
The utility model discloses a work flow includes following step:
step 1: and (3) water injection operation and inspection of the system:
when the generator set is in a stop state to be started, the condensed water replenishing stop valve 14 is opened, the condensed water replenishing valve 15 is opened to convey the desalted water of the desalted water tank 7 to the condenser 17, the condensed water pump 18 is started after the water level of the condenser 17 is normal, the deaerator water level regulating valve 48 is connected to supply water to the deaerator 44, and after the deaerator 44 is normal in water level, the deaerator water level regulating valve 48 is switched to an automatic state to automatically track the water level of the deaerator 44, so that automatic water replenishing is carried out in real time, and the water level of the deaerator 44 is ensured to; meanwhile, the condensate pump recirculation regulating valve 21 tracks the flow signal of the condensate pump outlet flow measuring device 19, and the outlet flow of the condensate pump is lower than the minimum flow value QCoagulation and circulationWhen the flow rate is not less than 130 t/h, the recirculation regulating valve 21 of the condensate pump is opened, and the outlet flow rate of the condensate pump is greater than the minimum flow rate value QCoagulation and circulationWhen +10=140 t/h, the condensate pump recirculation regulating valve 21 is closed;
the electric feed pump 38 is started by opening the feed pump inlet stop valve 35, the boiler water level adjusting valve 50 is opened in a linked mode to supply water to the boiler 55, after the water level of the boiler 55 is normal, the boiler water level adjusting valve 50 is switched into an automatic state, the water level of the boiler 55 is automatically tracked, automatic water supplement is carried out in real time, and the water level of the boiler 55 is guaranteed to be kept at a set water level; at the same time, the recirculation regulating valve 46 of the electric feed pump tracks the flow signal of the inflow measuring device 37 of the electric feed pump, and the inflow of the electric feed pump 38 is lower than the minimum flow value QPump circulation =148 t/h, opening the recirculation regulating valve 46 of the electric feed pump, and ensuring that the water inflow quantity of the electric feed pump is higher than the minimum flow value QPump circulationWhen 10=158 t/h, the electric motor is turned offA feed pump recirculation regulating valve 46;
after the system is injected with water and runs, the leakage of pipelines and valves is checked, and after no abnormity occurs, the boiler 55 is ignited to heat the feed water; the condenser 17 starts circulating water to run, and a vacuum pump 16 is started; after the pressure of steam generated by the boiler 55 is increased, the steam flows through the high-pressure bypass valve 54 and the low-pressure bypass valve 13, is subjected to pressure reduction and temperature reduction, enters the condenser 17 to be condensed into water, and then is conveyed to the boiler 55 through the condensate pump 18, the low-pressure heater 27, the deaerator 44 and the motor-driven feed water pump 38 in sequence, and the steam and the water are circulated in a thermal system of the generating set to gradually increase the temperature and the pressure of main steam and reheated steam; when the pressure rise of the steam at the cold section of the boiler reheater meets the heating water supply condition, the steam extraction of the cold section pipe of the boiler reheater is opened and enters the deaerator regulating valve 51, and the steam at the cold section of the boiler reheater pushes the steam extraction of the cold section pipe of the boiler reheater away, enters the deaerator check valve 52 and then enters the deaerator 44;
step 2: the generator set and the steam feed pump are started to operate:
the pressure signal P reaching the cold stage steam pressure measuring device 58 with the gradual rise of the temperature and the pressure of the boiler steamCold stageTemperature signal T of cold stage steam temperature measuring device 59 of =1.5 MPaCold stageWhen the temperature is not less than 350 ℃, steam is supplied to the steam header 9 by opening the cold section header regulating valve 6, the steam in the steam header 9 is heated and pressurized by opening the drain valve 12, and the temperature gradually reaches P through the signal monitoring of the header pressure measuring device 10 and the header temperature measuring device 11Couplet=0.8 MPa、TCouplet=320 ℃; after the turbo generator set has the starting and grid-connection conditions, the high-pressure regulating valve 56 and the medium-pressure regulating valve 57 are opened to rush the high-back-pressure steam-driven water-feeding pump turbine 24, and the rotating speed of the high-back-pressure steam-driven water-feeding pump turbine 24 reaches the rated rotating speed r0Grid-connected power generation is carried out when the speed is not less than 3000 r/min, and the load of a unit is gradually increased to 30% of rated load (90 MW); opening the steam pump turbine exhaust steam inlet low pressure cylinder regulating valve 28, fully opening the main steam valve 22 of the steam feed water pump turbine, opening the steam feed water pump turbine regulating valve 23, turning the high back pressure steam feed water pump turbine 24, the high back pressure steam feed water pump turbine 24 exhaust steam pushes the steam pump turbine exhaust steam inlet low pressure cylinder check valve 29 to enter the low pressure cylinder, opening the steam pump recirculation regulating valve 47, and simultaneously the steam feed water pump re-circulationThe circulation regulating valve 47 tracks the flow signal of the inflow water flow measuring device 31 of the steam feed water pump, and the outflow water flow of the steam feed water pump is lower than the minimum flow value QSteam pump circulation =At 240 t/h, the recirculation regulating valve 47 of the steam feed pump is opened, and the water inlet flow of the steam feed pump is larger than the minimum flow value QSteam pump circulationWhen 10=250 t/h, the steam feed pump recirculation regulating valve 47 is closed; when the measured value of the steam pump outlet pressure measuring device 33 reaches the measured value of the water supply main pipe pressure measuring device 41, the rotating speed of the electric water supply pump 38 is gradually reduced, when the measured value of the electric water supply pump outlet pressure measuring device 39 is lower than the measured value of the steam water supply pump outlet pressure measuring device 33, the electric water supply pump 38 is turned to supply water to the boiler 55 through the steam water supply pump 32, and the electric water supply pump 38 is withdrawn from operation and is in a standby state at any time; the steam-driven water-feeding pump 32 discharges steam and enters the low-pressure cylinder to do work and generate power, and the last-stage blade of the low-pressure cylinder of the large steam turbine is cooled; the steam discharged by the steam feed water pump 32 is conveyed to the low-pressure heater 27 according to the requirement to heat the condensed water, and the energy carried by the discharged steam is fully utilized; after the steam feed pump 32 supplies water to the boiler 55, the high back pressure steam feed pump set can gradually increase the load until the full load operation; the exhaust steam pressure measuring device 1 of the intermediate pressure cylinder displays that the exhaust steam pressure of the intermediate pressure cylinder reaches PMiddle row settingWhen the pressure is not less than 0.8 MPa, the steam exhaust and extraction regulating valve 4 of the intermediate pressure cylinder is opened, the steam source of the steam header 9 is supplied with steam by the cold section of the boiler reheater to the steam exhaust of the intermediate pressure cylinder, and the steam source of the cold section of the boiler reheater is used as a hot standby steam source and can supply steam to the steam header 9 at any time; the exhaust steam temperature measuring device 2 of the intermediate pressure cylinder measures and displays the exhaust steam supply temperature of the intermediate pressure cylinder; when the steam exhaust parameters of the intermediate pressure cylinder have heating conditions for supplying water to the deaerator 44, opening the steam exhaust port of the intermediate pressure cylinder to extract steam into the deaerator regulating valve 43, and pushing the steam exhaust port of the intermediate pressure cylinder to extract steam into the deaerator check valve 42 to enter the deaerator 44 to heat the supplying water;
and step 3: disconnecting the generator set and stopping the steam feed pump:
the steam turbine generator set gradually reduces the load operation, the rotating speed of the high back pressure steam feed pump turbine 24 is reduced along with the reduction of the water supply to the boiler 55, the steam feed pump recirculation regulating valve 47 tracks the water inlet flow of the steam feed pump 32, and the steam feed pump 3 is still ensured2 inflow is not lower than the minimum flow value QSteam pump circulation =240 t/h; when the load of the steam turbine generator unit is gradually reduced to cause that the steam exhausted by the intermediate pressure cylinder cannot meet the steam source requirement of the steam turbine 24 of the high-back-pressure steam-driven water-feeding pump, the steam source of the steam header 9 supplies steam to the cold section of the boiler reheater by the steam exhausted by the intermediate pressure cylinder; when the load of the steam turbine generator unit reaches a solution value, the steam turbine generator unit is disconnected from the power grid, and the steam turbine generator enters a barring operation after the rotating speed of the steam turbine generator is reduced; after the steam turbine generator unit is disconnected from the power grid, the low-pressure cylinder does not enter steam any more, and the steam pump turbine exhaust steam inlet low-pressure addition regulating valve 26 is opened to enable the exhaust steam of the high-back-pressure steam-driven water-feeding pump turbine 24 to push away the steam pump turbine exhaust steam inlet low-pressure addition check valve 25 and enter the low-pressure addition device 27; at this time, the electric feed pump 38 is started to operate, and the operation of the steam feed pump 32 is stopped after the electric feed pump 38 operates normally.
The present invention is not limited to the above-described embodiments, but only to the preferred embodiments of the present invention, and the present invention is not limited thereto, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. The utility model provides a large-scale generating set high back pressure steam-operated feed pump control system, includes boiler (55), high pressure jar, intermediate pressure jar, low pressure jar I, low pressure jar II, generator, its characterized in that: the system also comprises a high-back-pressure steam-driven water feed pump set, an electric water feed pump set, a condenser (17), a low-pressure heater (27), a steam header (9), a deaerator (44), a condensate pump (18), a vacuum pump (16), a monitoring system, a pressure measuring device, a temperature measuring device, a flow measuring device, a pipeline and a valve;
the high-back-pressure steam-driven water feed pump set comprises a high-back-pressure steam-driven water feed pump turbine (24), a steam-driven water feed pump (32) and a first front pump (30); the high back pressure steam-driven feed water pump turbine (24) and the steam-driven feed water pump (32) are coaxial and are rigidly connected through a coupler; the first pre-pump (30) is used for increasing the feed water pressure and preventing the impeller of the steam feed pump (32) from cavitation damage caused by the vaporization of high-temperature feed water entering the steam feed pump (32); the outlet of the steam-driven feed water pump (32) is connected with a check valve (34) of the steam-driven feed water pump, and the check valve is used for preventing the steam-driven feed water pump (32) from being damaged due to water backflow; the high-back-pressure steam-driven water-feeding pump turbine (24) is connected with the low-pressure heater (27) through a steam-pump turbine steam-exhaust steam-inlet low-pressure-addition check valve (25) and a steam-pump turbine steam-exhaust steam-inlet low-pressure-addition regulating valve (26) in sequence; the high-back-pressure steam-driven water-feeding pump turbine (24) is connected with the low-pressure cylinder II through a steam-pump turbine steam-exhaust steam-inlet low-pressure cylinder check valve (29) and a steam-pump turbine steam-exhaust steam-inlet low-pressure cylinder regulating valve (28) in sequence;
the electric water feed pump group comprises a variable frequency motor (45), an electric water feed pump (38) and a second pre-pump (36); the variable frequency motor (45) and the second front pump (36) are respectively connected with the electric water feeding pump (38), the second front pump (36) boosts the pressure of the feed water and then injects the boosted feed water into the electric water feeding pump (38), and the second front pump (36) is used for increasing the pressure of the feed water and preventing the cavitation damage of an impeller of the electric water feeding pump (38) caused by the vaporization of the high-temperature feed water entering the electric water feeding pump (38); an outlet of the electric feed pump (38) is provided with an electric feed pump check valve (40) for preventing the electric feed pump (38) from being damaged due to water backflow;
the steam feed pump check valve (34) and the electric feed pump check valve (40) are respectively connected with a boiler (55) through a high-pressure heater (49) and a boiler water level regulating valve (50) in sequence;
the high-pressure cylinder is connected with the steam header (9) sequentially through a high-pressure cylinder steam exhaust check valve (53), a boiler reheater cold section pipe steam extraction check valve (5) and a header regulating valve (6);
the intermediate pressure cylinder is connected with the steam header (9) through an intermediate pressure cylinder steam exhaust pipe steam extraction check valve (3) and an intermediate pressure cylinder steam exhaust steam extraction regulating valve (4) in sequence;
the steam header (9) is connected with a high-back-pressure steam-driven feed water pump steam turbine (24) through a steam-driven feed water pump steam turbine main steam valve (22) and a steam-driven feed water pump steam turbine regulating valve (23) in sequence; the steam supply source of the steam header (9) has two paths, one path is from the extraction steam of the cold section of the boiler reheater, and the other path is from the extraction steam of the intermediate pressure cylinder; a steam source of the steam header (9) is used as a power steam source of a high-back-pressure steam-driven water-feeding pump steam turbine (24);
the steam header (9) is connected with a condenser (17) through a drain pipeline and a drain regulating valve (12); the boiler (55) is connected with the condenser (17) through a low-pressure bypass valve (13); the low-pressure cylinder I and the low-pressure cylinder II are respectively connected with a condenser (17); the vacuum pump (16) is connected with the condenser (17) and is used for pumping out non-condensed gas in a steam chamber of the condenser (17) and improving the vacuum of the condenser (17); the desalting water tank (7) is connected with a condenser (17) sequentially through a condensed water replenishing stop valve (14) and a condensed water replenishing valve (15);
the condenser (17) is connected with the low-pressure heater (27) through the condensate pump (18) and the condensate pump check valve (20) in sequence; the condensate pump (18) pumps out the condensate in the condenser (17) and sends the condensate into the low-pressure heater (27), the condensate enters the low-pressure heater (27) and is heated, and the latent heat of vaporization of the exhaust steam of the high-back-pressure steam-driven water-feeding pump turbine (24) is fully absorbed; the condensate pump check valve (20) is used for preventing the condensate pump (18) from being damaged due to water backflow;
the heater (27) is connected with the deaerator (44) through a deaerator water level regulating valve (48); the steam-driven water feeding pump (32) is connected with the deaerator (44) through a steam-driven water pump recirculation regulating valve (47); the electric water feeding pump (38) is connected with the deaerator (44) through a recirculation regulating valve of the electric water feeding pump; the deaerator (44) is connected with the second front pump (36) and the first front pump (30) through a feed pump inlet stop valve (35);
the pressure measuring device comprises a cold section steam pressure measuring device (58), an intermediate pressure cylinder steam exhaust pressure measuring device (1), a header pressure measuring device (10), a steam pump outlet pressure measuring device (33), an electric water supply pump outlet pressure measuring device (39) and a water supply main pipe pressure measuring device (41);
the temperature measuring device comprises a cold section steam temperature measuring device (59), an intermediate pressure cylinder exhaust steam temperature measuring device (2) and a header temperature measuring device (11);
the cold-section steam pressure measuring device (58) and the cold-section steam temperature measuring device (59) are respectively arranged at a connecting pipeline between the high-pressure cylinder steam exhaust check valve (53) and the boiler reheater cold-section pipe steam extraction check valve (5); the device for measuring the exhaust steam pressure of the intermediate pressure cylinder (1) and the exhaust steam temperature of the intermediate pressure cylinder (2) are respectively arranged at a connecting pipeline between the intermediate pressure cylinder and the exhaust steam pipe exhaust steam check valve (3) of the pressure cylinder; the header pressure measuring device (10) and the header temperature measuring device (11) are respectively arranged at the steam header (9) and are respectively used for measuring the pressure and the temperature of steam in the steam header (9); the steam pump outlet pressure measuring device (33) is arranged at the outlet of the steam feed water pump (32); the outlet pressure measuring device (39) of the electric feed water pump is arranged at the outlet of the electric feed water pump (38); the pressure measuring device (41) of the water supply main pipe is arranged on a pipeline which is connected with the check valve (34) of the steam feed pump, the check valve (40) of the electric feed pump and the high-pressure heater (49);
the flow measuring device comprises a condensate pump outlet water flow measuring device (19), a steam feed pump inlet water flow measuring device (31) and an electric feed pump inlet water flow measuring device (37); the condensate pump outlet water flow measuring device (19) is arranged on a pipeline connecting the condensate pump (18) and the condensate pump check valve (20); the device (31) for measuring the inflow water flow of the steam feed pump is arranged on a pipeline connecting the first pre-pump (30) and the steam feed pump (32); the electric feed water pump inflow water flow measuring device (37) is arranged on a pipeline connecting the second pre-pump (36) and the electric feed water pump (38);
the pressure measuring device, the temperature measuring device and the flow measuring device are respectively connected with the monitoring system.
2. The large generator set high back pressure steam-driven feed water pump control system of claim 1, characterized in that: still include overpressure safety valve (8), overpressure safety valve (8) are connected with steam header (9), overpressure safety valve (8) are as the overpressure protection device of steam header (9), and overpressure safety valve (8) are discharged the steam step-down to the air when exceeding the pressure safety value and are prevented steam header (9) superpressure damage.
3. The large generator set high back pressure steam-driven feed water pump control system of claim 1, characterized in that: the low-pressure heater (27) is a tubular heat exchanger, condensed water is arranged on the inner side of the heat exchange tube, the steam is exhausted by a high-back-pressure steam feed pump turbine (24) for driving a steam feed pump (32) and extracted steam of a low-pressure cylinder I and a low-pressure cylinder II, and the exhausted steam enters the low-pressure heater (27) to be condensed and then flows into a condenser (17).
4. The large generator set high back pressure steam-driven feed water pump control system of claim 1, characterized in that: the intermediate pressure cylinder is connected with the deaerator (44) through the intermediate pressure cylinder steam exhaust port steam extraction steam inlet deaerator check valve (42) and the intermediate pressure cylinder steam exhaust port steam extraction steam inlet deaerator regulating valve (43) in sequence.
5. The large generator set high back pressure steam-driven feed water pump control system of claim 1, characterized in that: the system also comprises a condensate pump recirculation regulating valve (21); and the condensate pump recirculation regulating valve (21) is respectively connected with the condenser (17) and the condensate pump check valve (20).
6. The large generator set high back pressure steam-driven feed water pump control system of claim 1, characterized in that: the temperature measuring device comprises a type E thermocouple.
7. The large generator set high back pressure steam-driven feed water pump control system of claim 1, characterized in that: the pressure measuring device comprises an EJA series pressure transmitter.
8. The large generator set high back pressure steam-driven feed water pump control system of claim 1, characterized in that: the flow measuring device comprises a throttling orifice plate and an EJA series flow differential pressure transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921379178.6U CN210740372U (en) | 2019-08-23 | 2019-08-23 | Large-scale generating set high back pressure steam-driven feed pump control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921379178.6U CN210740372U (en) | 2019-08-23 | 2019-08-23 | Large-scale generating set high back pressure steam-driven feed pump control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210740372U true CN210740372U (en) | 2020-06-12 |
Family
ID=71004583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921379178.6U Active CN210740372U (en) | 2019-08-23 | 2019-08-23 | Large-scale generating set high back pressure steam-driven feed pump control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210740372U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855295A (en) * | 2020-12-31 | 2021-05-28 | 大唐郓城发电有限公司 | Backheating type driving small steam turbine system |
-
2019
- 2019-08-23 CN CN201921379178.6U patent/CN210740372U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855295A (en) * | 2020-12-31 | 2021-05-28 | 大唐郓城发电有限公司 | Backheating type driving small steam turbine system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110454769B (en) | Control system and control method for high-backpressure steam-driven feed pump of large generator set | |
| CN110500148B (en) | High-back-pressure heat supply and monitoring method and system for large steam turbine generator unit | |
| CN103382860A (en) | Control method for steam turbine power generation and heat supply system | |
| JP4898854B2 (en) | Power plant | |
| JPH03206305A (en) | Composite cycle power plant and operating method thereof | |
| CN112856363B (en) | System and method for improving heat supply steam parameters of deep peak shaving heat supply unit | |
| CN204693371U (en) | One directly reclaims turbine discharge waste heat and heat-setting water system | |
| CN113389606A (en) | Direct heat supply system and method for steam exhaust and extraction of steam of intermediate pressure cylinder of steam turbine of nuclear power unit | |
| CN206037003U (en) | Secondary reheating unit EC BEST steam turbine steam exhaust heating deoxidization boiler feed water's thermodynamic system | |
| CN210740372U (en) | Large-scale generating set high back pressure steam-driven feed pump control system | |
| CN204691833U (en) | A kind of circulating water afterheat utilized device | |
| CN210768938U (en) | High back pressure heat supply and monitoring system of large-scale turbo generator set | |
| CN215259733U (en) | Dry-wet state undisturbed switching system suitable for supercritical unit under deep peak regulation state | |
| CN112983575B (en) | High-flow steam extraction and heat supply steam turbine system | |
| CN211058873U (en) | High-pressure cylinder backflow heating system of cold-state steam turbine | |
| CN104594964A (en) | Novel single-shaft natural gas combined cycle heat supply unit system | |
| CN113864849A (en) | Dry-wet state undisturbed switching system and control method suitable for supercritical unit under deep peak regulation state | |
| CN106382620A (en) | Low-pressure water supply system for steam extraction and backheating of power station unit | |
| CN112344311A (en) | Industrial steam supply deep thermoelectric decoupling system and use method | |
| CN205955783U (en) | Draw gas low -pressure system of heating boiler feedwater of power station steam turbine | |
| CN219387970U (en) | System for improving economic and flexible operation of circulating water pump of steam power network | |
| CN210861030U (en) | Heating power device for waste incineration power plant | |
| CN215672380U (en) | System for recovering exhaust waste heat of steam turbine for heat supply | |
| CN111485963A (en) | Energy-saving efficient low-emission steam turbine power generation device | |
| CN214891122U (en) | Boiler steam turbine set starting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |