CN112082397B - Power plant condenser vacuumizing system based on adjustable steam ejector and control method - Google Patents
Power plant condenser vacuumizing system based on adjustable steam ejector and control method Download PDFInfo
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- CN112082397B CN112082397B CN202010874149.8A CN202010874149A CN112082397B CN 112082397 B CN112082397 B CN 112082397B CN 202010874149 A CN202010874149 A CN 202010874149A CN 112082397 B CN112082397 B CN 112082397B
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- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000000605 extraction Methods 0.000 claims description 43
- 230000001105 regulatory effect Effects 0.000 claims description 41
- 238000001816 cooling Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
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- Jet Pumps And Other Pumps (AREA)
Abstract
The invention relates to a power plant condenser vacuumizing system based on an adjustable steam ejector and a control method thereof, comprising a steam turbine, a condenser, more than two stages of steam ejectors and a condenser which are sequentially connected in series through a conveying pipeline, wherein the condenser of each stage is connected behind the steam ejector of the stage, a conveying switch valve I is arranged on the conveying pipeline between the condenser and the steam ejector of the stage, and the condenser is vacuumized through at least one water ring vacuum pump; the delivery pipeline between the delivery switch valve I and the primary steam ejector is connected in parallel with an adjustable steam ejector and an adjustable condenser which are sequentially connected in series through a delivery bypass. The problems of high power consumption, inconvenient maintenance and high power steam consumption of the existing steam ejector vacuum system of the water ring vacuum pump are solved, and the effects of energy conservation and consumption reduction are further achieved.
Description
Technical Field
The invention relates to the technical field of maintenance systems of power plant condenser vacuum, in particular to a power plant condenser vacuumizing system based on an adjustable steam ejector and a control method.
Background
The vacuum system of the steam turbine condenser of the power plant is one of important auxiliary machines for power plant production, the cold source loss can be effectively reduced by maintaining high-level vacuum, the heat cycle efficiency and the economy of the power plant are improved, and the vacuum system has very important significance for energy conservation and consumption reduction.
At present, the common condenser vacuumizing equipment of a power plant is a water ring type vacuum pump, so that the vacuum of the condenser can be quickly established when a unit is started, and the vacuum of the condenser can be well maintained when the unit is operated. However, the water ring vacuum pump system has the following disadvantages: the operation of the vacuum pump is influenced by the working fluid, cavitation is easy to occur, noise is high, and overhaul workload is high; the water ring vacuum pump consumes a part of plant power when maintaining vacuum, which is unfavorable for the economical efficiency of power plant production. The steam ejector vacuum system can effectively solve the problem of a water ring vacuum pump in a vacuum maintenance stage, is also widely applied to various power plants at present, and plays a certain role in reducing the power consumption of the plants and the economic and stable operation of the units. The vacuum system of the steam injector commonly used at the present stage is mainly roughly regulated, so that the waste of power steam is caused.
The three-stage switchable steam injection vacuumizing system with low steam consumption disclosed by the publication No. CN106643204A is used for freely switching among the operation modes of the primary injection system, the secondary injection system and the three-stage injection system according to the environmental conditions and the actual operation conditions of the unit by the three-stage switchable steam injection vacuumizing system so as to adapt to the actual working conditions of the unit. Three-stage switchable operation modes are realized through an air extraction pipeline communicated with the first ejector, an air extraction bypass pipeline communicated with the air extraction pipeline and the first condenser, a first exhaust pipeline communicated with the second condenser, air extraction pipelines, each switch valve on the air extraction bypass pipeline and the first exhaust pipeline, and a switch valve on a communication pipeline for introducing power steam into each ejector, so that the valves are numerous, the whole operation system is suitable for actual working conditions, and the switching between each ejector and the condenser is frequent, so that the overall control and stable operation of the system are not facilitated.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a power plant condenser vacuumizing system and a control method based on an adjustable steam injector, which solve the problems of high power consumption of a water ring vacuum pump, inconvenient maintenance and high power steam consumption of the existing steam injector vacuum system, further play a role in saving energy and reducing consumption, and are convenient to control and stable in operation.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
as one aspect of the invention, a power plant condenser vacuumizing system based on an adjustable steam ejector comprises a steam turbine, a condenser, more than two stages of steam ejectors and a condenser which are sequentially connected in series through a conveying pipeline, wherein the condenser of each stage is connected behind the stage of steam ejector, a conveying switch valve I is arranged on the conveying pipeline between the condenser and the stage of steam ejector, and the condenser is vacuumized through at least one water ring vacuum pump;
The conveying pipeline between the first conveying switch valve and the first-stage steam ejector is connected in parallel with an adjustable steam ejector and an adjustable condenser which are sequentially connected in series through a conveying bypass, a first conveying bypass, the injection port of which is communicated with the conveying pipeline, and a third conveying bypass, the exhaust port of which is communicated with the conveying pipeline, are respectively provided with a first bypass switch valve and a third bypass switch valve, and a second conveying switch valve is arranged on the conveying pipeline between the first conveying bypass and the third conveying bypass;
The adjustable steam ejector and each stage of steam ejector are respectively communicated with a main steam pipeline through an auxiliary steam pipeline, the main steam pipeline is communicated with an auxiliary steam header steam extraction port of the steam turbine, a steam switch valve is arranged on the main steam pipeline between the auxiliary steam header steam extraction port of the steam turbine and each auxiliary steam pipeline, power steam output from the auxiliary steam header steam extraction port of the steam turbine flows through the steam switch valve and then is input into each steam ejector through each auxiliary steam pipeline in parallel through the main steam pipeline, and an electric regulating valve II is arranged on the auxiliary steam pipeline between the adjustable steam ejector and the main steam pipeline.
In one embodiment, an electric regulating valve I is arranged on a main steam pipeline between an auxiliary gas header steam extraction port and each auxiliary steam pipeline of the steam turbine and behind a steam switch valve.
In one embodiment, the condenser is followed by a three-stage steam ejector and a condenser in series, wherein the two-stage condenser and the three-stage condenser are of an integrated structure.
In one embodiment, the water ring vacuum pump is communicated with one of the air extraction outlets of the condenser through an air extraction pipeline, and an air extraction switch valve is arranged on the air extraction pipeline.
One embodiment of the system further comprises a control module, wherein the condenser is provided with a signal collector for collecting back pressure of the condenser, exhaust steam quantity of the steam turbine, cooling circulating water temperature and cooling circulating water quantity entering the condenser, a temperature sensor and a pressure transmitter are arranged in front of the adjustable steam injector, and data collected by the signal collector of the condenser, the temperature sensor of the adjustable steam injector and the pressure transmitter are transmitted to the control module, and the control module controls opening and closing of each switch valve and opening and closing of each electric regulating valve according to a preset program.
In one embodiment, a second bypass switch valve is installed on a second conveying bypass, wherein the second conveying bypass is communicated with the air inlet of the adjustable condenser, and the second conveying bypass is communicated with the air inlet of the adjustable condenser.
As another aspect of the present invention, a control method of a power plant condenser vacuum pumping system based on an adjustable steam injector, based on the above power plant condenser vacuum pumping system based on an adjustable steam injector, includes the following steps:
Closing a steam switch valve and a conveying switch valve I, opening an air extraction switch valve, and establishing and maintaining vacuum for air extraction of the condenser by a water ring vacuum pump, wherein the actual vacuum value is P 01;
after the water ring vacuum pump establishes vacuum, the steam switch valve and the conveying switch valve I are opened, the air extraction switch valve is closed, at the moment, the electric regulating valve II, the bypass switch valve I, the bypass switch valve II and the bypass switch valve III are in a closed state, the conveying switch valve II is in an open state, the control module calculates a target vacuum value P 0 of the condenser according to collected data, and the actual vacuum value P 01 is compared with the target vacuum value P 0:
If P 0>P01, the control module sends a command to the actuating mechanism of the first electric regulating valve, and gradually increases the opening of the first electric regulating valve to increase the power steam flow until the target vacuum value is reached; if the opening of the first electric regulating valve reaches the maximum, the vacuum value of the condenser still cannot reach the target vacuum value, at the moment, the second electric regulating valve, the first bypass switching valve, the second bypass switching valve and the third bypass switching valve are opened, the second conveying switching valve is closed, and the adjustable steam injector is put into operation;
If P 0<P01, the control module sends a command to the actuating mechanism of the first electric regulating valve, the opening of the first electric regulating valve is reduced, and the power steam flow is reduced until the target vacuum value is reached.
Further, the target vacuum value P 0 is calculated by the following formula:
P0＝P Atmospheric air -Ps(1)
PS＝f(Dc,Dw,tw)(2)
Wherein P s is condenser back pressure, kPa;
P 0 is the vacuum value of the condenser, KPa;
D c is the exhaust steam amount of the steam turbine, kg/s
D w is the cooling circulating water quantity entering the condenser, kg/s;
t w is the temperature of cooling circulating water entering the condenser, and the temperature is lower than the temperature;
Further, if P 0>P01, after the adjustable steam injector is put into operation, the target vacuum value cannot be reached, and the control module increases the extraction amount by increasing the opening of the electric control valve two until the target vacuum value is reached.
Further, if the load of the unit changes, the control module adjusts the opening degree of the electric regulating valve I according to the collected turbine exhaust steam quantity D c, the condenser actual vacuum value P 01, the circulating water quantity D W entering the condenser and the cooling circulating water temperature t w, if the electric regulating valve II, the bypass switch valve I, the bypass switch valve II and the bypass switch valve III are required to be opened, the conveying switch valve II is closed, the adjustable steam injector is put into operation, and the opening degree of the electric regulating valve II is adjusted until the target vacuum value under the new working condition of the unit is reached.
The invention has the following beneficial effects:
The invention reduces the power consumption when the water ring vacuum pump system maintains vacuum; maintenance work is reduced; the range of the adaptation working condition is wide, the energy is saved, the three fixed steam ejectors work under the working condition of higher injection efficiency all the time by adjusting the inlet steam quantity of the adjustable steam ejectors, and the auxiliary steam consumption is reduced. And the system is convenient to control and stable in operation.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Reference numerals illustrate:
1-a steam turbine; 2-a condenser; 3-an air extraction switch valve; 4-a first water ring vacuum pump; 5-a second water ring vacuum pump; 6-a first conveying switch valve; 7-a steam switch valve; 8-stage steam ejector; 9-an adjustable steam ejector; 10-a secondary steam ejector; 11-three stage steam injector; 12-an electric regulating valve II; 13-bypass switch valve one; 14-an electric regulating valve I; 15-a control module; 16-a bypass switch valve III; 17-a bypass switch valve II; 18-an adjustable condenser; 19-a first stage condenser; a 20-second stage condenser; 21-a three-stage condenser; 101-a conveying pipeline; 102-an air extraction pipeline; 103-conveying bypass one; 104-conveying a second bypass; 105-a conveying bypass III; 106-auxiliary steam pipeline; 107-main steam line; 108-a hydrophobic pipeline.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and specific examples:
Referring to fig. 1, a power plant condenser vacuumizing system based on adjustable steam ejectors comprises a steam turbine 1, a condenser 2, a primary steam ejector 8, a primary condenser 19, a secondary steam ejector 10, a secondary condenser 20, a tertiary steam ejector 11 and a tertiary condenser 21 which are sequentially connected in series through a conveying pipeline 101, wherein the secondary condenser 20 and the tertiary condenser 21 are of an integrated structure, and a conveying switch valve I6 is arranged on the conveying pipeline 101 between the condenser 2 and the primary steam ejector 8. The low-pressure steam of the condenser 2 is mixed with the power steam transmitted from the steam turbine 1 through each steam ejector sequentially from an air extraction outlet of the condenser 2, condensed through each condenser, and discharged to the outside through an air outlet of the three-stage condenser 21.
Specifically, an air exhaust outlet of the condenser 2 is communicated with an injection port of the primary steam injector 8 through the first conveying switch valve 6, a mixed steam outlet of the primary steam injector 8 is communicated with an air inlet of the primary condenser 19, an air exhaust port of the primary condenser 19 is communicated with an injection port of the secondary steam injector 10, a mixed steam outlet of the secondary steam injector 10 is communicated with an air inlet of the secondary condenser 20, an air exhaust port of the secondary condenser 20 is communicated with an injection port of the tertiary steam injector 11, a mixed steam outlet of the tertiary steam injector 11 is communicated with an air inlet of the tertiary condenser 21, and uncondensed gas is discharged to the outside through an air exhaust port of the tertiary condenser 21.
The condenser 2 is evacuated by at least one water ring vacuum pump. The water ring vacuum pump is communicated with the other air extraction outlet of the condenser 2 through an air extraction pipeline 102, and an air extraction switch valve 3 is installed on the air extraction pipeline 102. And the outlet of the water ring vacuum pump is communicated with the outside. In this embodiment, two water ring vacuum pumps are provided, namely, a first water ring vacuum pump 4 and a second water ring vacuum pump 5, and the first water ring vacuum pump 4 and the second water ring vacuum pump 5 are respectively connected in parallel through a branch pipeline and then are communicated with another air extraction outlet of the condenser 2 through an air extraction pipeline 102.
The delivery pipeline 101 between the delivery switch valve I6 and the primary steam ejector 8 is connected with the adjustable steam ejector 9 and the adjustable condenser 18 which are sequentially connected in series in parallel through a delivery bypass. A first bypass switch valve 13 is installed on a first conveying bypass 103, the injection port of the adjustable steam injector 9 is communicated with the conveying pipeline 101, a second bypass switch valve 17 is installed on a second conveying bypass 104, the mixed steam outlet of the adjustable steam injector 9 is communicated with the air inlet of the adjustable condenser 18, and a third bypass switch valve 16 is installed on a third conveying bypass 105, the air outlet of the adjustable condenser 18 is communicated with the conveying pipeline 101. A second delivery switch valve 21 is installed on the delivery pipe 101 between the first delivery bypass 103 and the third delivery bypass 105.
The adjustable steam injector 9, the primary steam injector 8, the secondary steam injector 10 and the tertiary steam injector 11 are respectively communicated with a main steam pipeline 107 through an auxiliary steam pipeline 106, and the main steam pipeline 107 is communicated with an auxiliary gas header steam extraction port of the steam turbine 1. The main steam pipeline 107 between the auxiliary gas header steam extraction port and each auxiliary steam pipeline 106 of the steam turbine 1 is sequentially provided with a steam switch valve 7 and an electric regulating valve I14, and power steam output from the auxiliary gas header steam extraction port of the steam turbine 1 flows through the steam switch valve 7 and the electric regulating valve I14 and then is input into each steam injector through each auxiliary steam pipeline 106 connected in parallel through the main steam pipeline 107. An electric regulating valve II 12 is arranged on a secondary steam pipeline 106 between the adjustable steam ejector 9 and the main steam pipeline 107.
The water outlets of the adjustable condenser 18, the primary condenser 19, the secondary condenser 20 and the tertiary condenser 21 are respectively communicated with the heat well of the condenser 2 through a drain pipeline 108.
A control module 15 is also included. The condenser 2 is provided with a signal collector for collecting back pressure of the condenser 2, exhaust steam quantity of the steam turbine 1, cooling circulating water temperature entering the condenser 2 and cooling circulating water quantity. A temperature sensor and a pressure transmitter are arranged in front of the adjustable steam injector 9. The data collected by the signal collector of the condenser 2, the temperature sensor of the adjustable steam injector 9 and the pressure transmitter are transmitted to the control module 15, and the control module 15 controls the opening and closing of each switch valve and the opening and closing of each electric regulating valve and the opening degree according to a preset program.
The working flow of the power plant condenser vacuumizing system based on the adjustable steam injector is as follows:
Closing a steam switch valve 7 and a conveying switch valve I6, opening an air extraction switch valve 3, and enabling the water ring vacuum pump to extract air from the condenser 2 and establish and maintain vacuum, wherein the actual vacuum value is P 01;
under the working condition, the cooling circulating water quantity and the cooling circulating water temperature entering the condenser are certain values, and then the target vacuum value is:
P0＝P Atmospheric air -Ps (1)
PS＝f(Dc,Dw,tw)(2)
Wherein P s is condenser back pressure, kPa;
P 0 is the vacuum value of the condenser, KPa;
d c is the exhaust steam quantity of the steam turbine 1, kg/s
D w is the cooling circulating water quantity entering the condenser 2, kg/s;
t w is the temperature of cooling circulating water entering the condenser 2, and the temperature is lower than the temperature.
After the water ring vacuum pump establishes vacuum, the steam switch valve 7 and the conveying switch valve I6 are opened, the air extraction switch valve 3 is closed, at the moment, the electric regulating valve II 12, the bypass switch valve I13, the bypass switch valve II 17 and the bypass switch valve III 16 are in a closed state, the conveying switch valve II 21 is in an open state, the control module 15 automatically collects the temperature of cooling circulating water entering the condenser 2 and the cooling circulating water entering the condenser 2, a target vacuum value P 0 of the condenser 2 is calculated, and the sizes of the actual vacuum value P 01 and the target vacuum value P 0 are compared:
If P 0>P01, the control module 15 sends a command to the actuating mechanism of the first electric regulating valve 14, and gradually increases the opening of the first electric regulating valve 14, so that the power steam flow is increased until the target vacuum value is reached, and the safe and stable operation of the unit is ensured.
If the opening of the electric regulating valve I14 is maximum, the vacuum value of the condenser 2 still cannot reach the target vacuum value P 0, at the moment, the bypass switch valve I13, the bypass switch valve II 17 and the bypass switch valve III 16 are opened, the conveying switch valve II 21 is closed, the adjustable steam injector 9 is put into operation, and the control module 15 increases the extraction quantity by increasing the opening of the electric regulating valve II 12 so as to reach the target vacuum value.
If P 0<P01, the control module 15 sends a command to the actuating mechanism of the first electric regulating valve 14, reduces the opening of the first electric regulating valve 14, and reduces the power steam flow until reaching the target vacuum value, so as to achieve the effects of energy saving and efficiency improvement.
If the unit load changes, the control module 15 adjusts the opening degree of the electric regulating valve I14 according to the collected steam turbine 1 exhaust quantity D c, the condenser 2 actual vacuum value P 01, the cooling circulating water quantity D W entering the condenser and the circulating water temperature t w, if the electric regulating valve II 12, the bypass switch valve I13, the bypass switch valve II 17 and the bypass switch valve III 16 are required to be opened, the conveying switch valve II 21 is closed, the adjustable steam injector 9 is put into operation, and the opening degree of the electric regulating valve II 12 is adjusted until the target vacuum value under the new working condition of the unit is reached.
The foregoing description is only specific embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (6)
1. Power plant condenser vacuum pumping system based on adjustable steam ejector, its characterized in that: the device comprises a steam turbine (1), a condenser (2), more than two stages of steam ejectors and condensers which are sequentially connected in series through a conveying pipeline (101), wherein the condensers of each stage are connected behind the steam ejectors of the stage, a conveying switch valve I (6) is arranged on the conveying pipeline (101) between the condenser (2) and the first-stage steam ejectors (8), and the condenser (2) is vacuumized through at least one water ring vacuum pump;
A conveying pipeline (101) between the conveying switch valve I (6) and the primary steam ejector (8) is connected in parallel with an adjustable steam ejector (9) and an adjustable condenser (18) which are sequentially connected in series through a conveying bypass, a conveying bypass I (103) communicated with the conveying pipeline (101) at the injection port of the adjustable steam ejector (9) and a conveying bypass III (105) communicated with the conveying pipeline (101) at the exhaust port of the adjustable condenser (18) are respectively provided with a bypass switch valve I (13) and a bypass switch valve III (16), and a conveying switch valve II (21) is arranged on the conveying pipeline (101) between the conveying bypass I (103) and the conveying bypass III (105);
The adjustable steam ejector (9) and each stage of steam ejectors are respectively communicated with a main steam pipeline (107) through an auxiliary steam pipeline (106), the main steam pipeline (107) is communicated with auxiliary gas header steam extraction ports of the steam turbine (1), a steam switch valve (7) is arranged on the main steam pipeline (107) between the auxiliary gas header steam extraction ports of the steam turbine (1) and each auxiliary steam pipeline (106), and power steam output from the auxiliary gas header steam extraction ports of the steam turbine (1) flows through the steam switch valve (7) and is then input into each steam ejector through each auxiliary steam pipeline (106) connected in parallel by the main steam pipeline (107), and an electric control valve II (12) is arranged on the auxiliary steam pipeline (106) between the adjustable steam ejector (9) and the main steam pipeline (107);
An electric regulating valve I (14) is arranged behind the steam switch valve 7 on a main steam pipeline (107) between an auxiliary gas header steam extraction port and each auxiliary steam pipeline (106) of the steam turbine (1); the three-stage steam ejector and the condenser are connected in series behind the condenser (2), wherein the two-stage condenser (20) and the three-stage condenser are of an integrated structure; the water ring vacuum pump is communicated with one air extraction outlet of the condenser (2) through an air extraction pipeline (102), and an air extraction switch valve (3) is arranged on the air extraction pipeline (102); still include a control module (15), install signal acquisition ware on condenser (2) for gather condenser (2) backpressure, steam turbine (1) exhaust steam volume, get into cooling circulation water temperature and the cooling circulation water volume of condenser (2), install temperature sensor and pressure transmitter before adjustable steam injector (9), the data transmission to control module (15) that signal acquisition ware of condenser (2) and temperature sensor and the pressure transmitter of adjustable steam injector (9) gathered, control module (15) are according to the switching of preset program control each ooff valve and the switching and the size of aperture of each electric control valve.
2. The adjustable steam ejector-based power plant condenser evacuation system of claim 1, wherein: and a second bypass switch valve (17) is arranged on a second conveying bypass (104) of the mixed steam outlet of the adjustable steam ejector (9) communicated with the air inlet of the adjustable condenser (18).
3. The control method of the power plant condenser vacuumizing system based on the adjustable steam injector is based on the power plant condenser vacuumizing system of the adjustable steam injector as claimed in claim 2, and is characterized by comprising the following steps:
Closing a steam switch valve (7) and a conveying switch valve I (6), opening an air extraction switch valve (3), and establishing and maintaining vacuum for the condenser (2) by the water ring vacuum pump, wherein the actual vacuum value is P 01;
After the water ring vacuum pump establishes vacuum, a steam switch valve (7) and a conveying switch valve I (6) are opened, an air extraction switch valve (3) is closed, at the moment, an electric regulating valve II (12), a bypass switch valve I (13), a bypass switch valve II (17) and a bypass switch valve III (16) are in a closed state, a conveying switch valve II (21) is in an open state, a control module (15) calculates a target vacuum value P 0 of the condenser (2) according to collected data, and the sizes of an actual vacuum value P 01 and the target vacuum value P 0 are compared:
If P 0>P01, the control module (15) sends a command to the actuating mechanism of the first electric regulating valve (14), and gradually increases the opening of the first electric regulating valve (14) to increase the power steam flow until the target vacuum value is reached; if the opening of the electric regulating valve I (14) is maximum, the vacuum value of the condenser (2) still cannot reach the target vacuum value, at the moment, the electric regulating valve II (12), the bypass switch valve I (13), the bypass switch valve II (17) and the bypass switch valve III (16) are opened, the conveying switch valve II (21) is closed, and the adjustable steam injector (9) is put into operation;
if P 0<P01, the control module (15) sends a command to the actuating mechanism of the first electric regulating valve (14), the opening degree of the first electric regulating valve is reduced, and the power steam flow is reduced until the target vacuum value is reached.
4. A control method of a power plant condenser vacuumizing system based on an adjustable steam injector as claimed in claim 3, wherein:
The target vacuum value P 0 is calculated by the following formula:
P0＝P Atmospheric air -Ps (1)
PS＝f(Dc,Dw,tw) (2)
Wherein P s is condenser back pressure, kPa;
P 0 is the vacuum value of the condenser, KPa;
D c is the exhaust steam amount of the steam turbine, kg/s
D w is the cooling circulating water quantity entering the condenser, kg/s;
t w is the temperature of cooling circulating water entering the condenser, and the temperature is lower than the temperature.
5. A control method of a power plant condenser vacuumizing system based on an adjustable steam injector as claimed in claim 3, wherein: if P 0>P01 is not available, the control module (15) increases the extraction amount by increasing the opening of the second electric control valve (12) until the target vacuum value is reached.
6. The control method for a power plant condenser vacuumizing system based on adjustable steam ejectors according to claim 4, wherein: if the unit load changes, the control module (15) adjusts the opening degree of the electric regulating valve I (14) according to the collected steam turbine (1) exhaust steam quantity D c, the condenser (2) actual vacuum value P 01, the circulating water quantity D W entering the condenser (2) and the cooling circulating water temperature t w, if the electric regulating valve II (12), the bypass switch valve I (13), the bypass switch valve II (17) and the bypass switch valve III (16) are required to be opened, the conveying switch valve II (21) is closed, the adjustable steam injector (9) is put into operation, and the opening degree of the electric regulating valve II (12) is adjusted until the target vacuum value under the new working condition of the unit is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874149.8A CN112082397B (en) | 2020-08-26 | 2020-08-26 | Power plant condenser vacuumizing system based on adjustable steam ejector and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874149.8A CN112082397B (en) | 2020-08-26 | 2020-08-26 | Power plant condenser vacuumizing system based on adjustable steam ejector and control method |
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| CN112082397A CN112082397A (en) | 2020-12-15 |
| CN112082397B true CN112082397B (en) | 2024-07-05 |
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| CN212482164U (en) * | 2020-08-26 | 2021-02-05 | 普瑞森能源科技（北京）股份有限公司 | Power plant condenser vacuum pumping system based on adjustable steam ejector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5374270B2 (en) * | 2009-07-30 | 2013-12-25 | 川崎重工業株式会社 | Condenser vacuum adjustment device, vacuum adjustment method, and steam turbine plant |
| CN203772055U (en) * | 2014-04-11 | 2014-08-13 | 张曙光 | Power plant condenser steam injection vacuum-pumping system with pressure control |
| CN203772052U (en) * | 2014-04-11 | 2014-08-13 | 张曙光 | Multistage steam ejector vacuum-pumping system of double backpressure condensers |
| CN106643204B (en) * | 2017-01-05 | 2018-08-24 | 陆明 | Vapor injection vacuum pumping system can be switched in the three-level of low steam consumption |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212482164U (en) * | 2020-08-26 | 2021-02-05 | 普瑞森能源科技（北京）股份有限公司 | Power plant condenser vacuum pumping system based on adjustable steam ejector |
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