CN114837757A - Thermal power plant high-pressure feed water bypass frequency modulation system with steam ejector and working method - Google Patents
Thermal power plant high-pressure feed water bypass frequency modulation system with steam ejector and working method Download PDFInfo
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- CN114837757A CN114837757A CN202210590706.2A CN202210590706A CN114837757A CN 114837757 A CN114837757 A CN 114837757A CN 202210590706 A CN202210590706 A CN 202210590706A CN 114837757 A CN114837757 A CN 114837757A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/24—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing liquids, e.g. containing solids, or liquids and elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Water Supply & Treatment (AREA)
- Fluid Mechanics (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention discloses a high-feed water bypass frequency modulation system of a thermal power plant with a steam ejector and a working method. Meanwhile, the characteristics of the steam ejector are combined, the feed water temperature of the boiler is adjusted, the heat of low-pressure steam is effectively utilized in a gradient mode, the utilization rate of energy is improved, and the stable operation of the high-pressure bypass boiler is guaranteed.
Description
Technical Field
The invention belongs to the field of frequency modulation systems, and particularly relates to a high-feed water bypass frequency modulation system provided with a steam ejector and used for a thermal power plant and a working method.
Background
With the grid connection of new energy, the installed capacities of wind power and photoelectricity are increasing day by day, and due to the fact that energy supply of the new energy is unstable, a power grid makes relevant detailed rules for a thermal power generating unit to participate in primary frequency modulation, and corresponding requirements for the thermal power generating unit to participate in adjusting the speed and the adjusting precision are provided. If the frequency modulation is carried out by using the boiler heat accumulation, the load response time scale is larger, but the energy storage capacity in the steam turbine is limited.
Electric energy is easy to transmit but cannot be stored in large quantity at present because the characteristic of the electric energy requires that the generating capacity of a power plant needs to be changed correspondingly along with the change of external electric loads. The large-scale grid connection of new energy, but the energy supply is unstable, and the fluctuation change of the new energy cannot be effectively predicted at present. Therefore, frequency fluctuation at the power grid side is easily caused, and the power grid has higher and higher requirements on the primary frequency modulation capability of the thermal power generating unit. The reaction time of the thermal power unit turbine participating in peak shaving frequency modulation to load regulation is short. The rapid variable load capacity of the steam turbine can be effectively improved by using the frequency modulation means of ultrahigh pressure throttle regulation. The frequency modulation mode of the high-pressure feed water bypass easily causes the temperature fluctuation of the feed water of the boiler, and influences the stable operation of the boiler.
Disclosure of Invention
The invention aims to overcome the defects and provides a high-feed-water bypass frequency modulation system and a working method for a thermal power plant, which are provided with a steam ejector.
In order to achieve the purpose, the thermal power plant high-pressure water supply bypass frequency modulation system provided with the steam ejector comprises a boiler, wherein the boiler is connected with a high-pressure cylinder, the high-pressure cylinder is connected with a low-pressure cylinder, the steam extraction of the low-pressure cylinder is respectively connected with a low-pressure steam storage tank and a high-pressure steam storage tank through pipelines, the steam outlet of the high-pressure cylinder is connected with a small steam turbine through a pipeline, the small steam turbine drives a small steam turbine water supply pump to rotate, the small steam turbine water supply pump is connected with the water inlet of a high-pressure regenerative heater, the water outlet of the high-pressure regenerative heater is finally connected with the boiler, the steam extraction of the high-pressure cylinder is connected with the pipe side of the high-pressure regenerative heater through a pipeline, the low-pressure steam storage tank and the high-pressure steam storage tank are both connected with the steam ejector, the steam ejector is connected with the heat source side inlet of a steam ejector heat exchanger of the high-pressure water supply bypass, the heat source side outlet of the steam ejector heat exchanger is connected with a deaerator, the deaerator is connected with the small steam turbine water supply pump, the steam ejector heat exchanger is connected with a small steam turbine feed pump and a boiler.
And a low-pressure steam storage tank steam extraction valve is arranged on a connecting pipeline between the low-pressure steam storage tank and the low-pressure steam storage tank, and a steam ejector low-pressure valve is arranged on a connecting pipeline between the low-pressure steam storage tank and the steam ejector.
And a high-pressure steam storage tank steam extraction valve is arranged on a connecting pipeline between the low-pressure cylinder and the high-pressure steam storage tank, and a steam ejector high-pressure valve is arranged on a connecting pipeline between the high-pressure steam storage tank steam extraction valve and the steam ejector.
And a small turbine inlet regulating valve is arranged on a connecting pipeline between the high-pressure cylinder and the small turbine.
The low-pressure cylinder is connected with the condenser, the steam exhaust pipeline of the small turbine of the condenser and the condensate pump are connected with the deaerator, and the deaerator is connected with the water feed pump of the small turbine.
The high-pressure feed water bypass comprises an electric feed water pump, the upper stream of the electric feed water pump is connected with a deaerator, the lower stream of the electric feed water pump is connected with a cold source side inlet of the steam ejector heat exchanger, and a cold source side outlet of the steam ejector heat exchanger is connected with a boiler.
And a high-pressure bypass regulating valve is arranged on a connecting pipeline of the electric water feeding pump and the steam ejector heat exchanger.
A working method of a high-feed water bypass frequency modulation system of a thermal power plant with a steam ejector comprises the following steps:
when the unit operates, pumping steam of the low-pressure cylinder is sent into the low-pressure steam storage tank and the high-pressure steam storage tank;
in the load reducing process of the unit, the steam flow entering the small steam turbine by the high-pressure cylinder is increased, the flow of a water feed pump of the small steam turbine is increased, the steam flow entering the small steam turbine is increased, the inlet water flow of the high-pressure regenerative heater is increased, the heat exchange temperature rise of the tube side of the high-pressure regenerative heater is reduced, the outlet temperature of the tube side of the high-pressure regenerative heater is reduced, the shell side pressure of the high-pressure regenerative heater is reduced, the pressure difference between the upper side and the lower side of a steam extraction pipeline between the high-pressure cylinder and the high-pressure regenerative heater is increased, the steam extraction flow of the high-pressure regenerative heater is increased, the steam flow entering the steam turbine for doing work is reduced, and the output power of the steam turbine is reduced; the steam extraction amount of the high-pressure regenerative heater is increased, the heat obtained at the water supply outlet of the high-pressure regenerative heater is increased, the flow of a high-pressure water supply bypass is reduced, the steam sent into the steam ejector is reduced, and the heat absorbed by the bypass water supply from the heat pump is reduced;
in the unit load-increasing process, the steam flow of the small steam turbine is reduced, the steam flow of the high-pressure cylinder entering the small steam turbine is reduced, the flow of the small steam turbine water supply pump is reduced, the steam flow entering the small steam turbine is reduced, the inlet water flow of the high-pressure regenerative heater is reduced, the heat exchange temperature rise of the high-pressure regenerative heater tube side is increased, the temperature of the outlet of the high-pressure regenerative heater tube side is increased, the pressure of the high-pressure regenerative heater shell side is increased, the pressure difference between the high-pressure cylinder and the high-pressure regenerative heater between the upper side and the lower side of a steam extraction pipeline is reduced, the steam extraction flow of the high-pressure regenerative heater is reduced, the steam flow entering the steam turbine for acting is increased, and therefore the output power of the steam turbine is increased; the steam extraction amount of the high-pressure regenerative heater is reduced, the heat obtained at the water supply outlet of the high-pressure regenerative heater is reduced, the flow of the high-pressure regenerative heater water supply bypass is increased, the steam sent into the steam ejector is increased, and the heat absorbed by the bypass water supply from the heat pump is increased.
In the load reducing process of the unit, the opening degree of an inlet adjusting valve of the small steam turbine is increased, and the opening degrees of a low-pressure valve of the steam ejector and a high-pressure valve of the steam ejector are reduced.
In the load-increasing process of the unit, the opening degree of the regulating valve at the inlet of the small steam turbine is reduced, and the opening degrees of the low-pressure valve of the steam ejector and the high-pressure valve of the steam ejector are increased.
Compared with the prior art, the invention combines the steam ejector with the water feeding bypass, and achieves the purpose of reducing or increasing the power of the unit by adjusting the steam inlet quantity of the small steam turbine and reducing or increasing the steam quantity when the unit participates in primary frequency modulation. Meanwhile, the characteristics of the steam ejector are combined, the feed water temperature of the boiler is adjusted, the heat of low-pressure steam is effectively utilized in a gradient mode, the utilization rate of energy is improved, and the stable operation of the high-pressure bypass boiler is guaranteed.
Drawings
FIG. 1 is a system diagram of the present invention;
wherein, 1 is boiler, 2 is high pressure cylinder, 3 is low pressure cylinder, 4 is condenser, 5 is condensate pump, 6 is small steam turbine, 7 is small steam turbine inlet governing valve, 8 is deaerator, 9 is small steam turbine feed pump, 10 is high pressure backheat heater, 11 is electronic feed pump, 12 is high and adds the bypass governing valve, 13 is steam ejector heat exchanger, 14 is steam ejector, 15 is low pressure steam storage tank, 16 is steam ejector low pressure valve, 17 is high pressure steam storage tank, 18 is steam ejector high pressure valve, 19 is low pressure steam storage tank extraction valve, 20 is high pressure steam storage tank extraction valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, a high pressure feed water bypass frequency modulation system of a thermal power plant configured with a steam ejector comprises a boiler 1, wherein the boiler 1 is connected with a high pressure cylinder 2, the high pressure cylinder 2 is connected with a low pressure cylinder 3, the steam extraction of the low pressure cylinder 3 is respectively connected with a low pressure steam storage tank 15 and a high pressure steam storage tank 17 through pipelines, the steam outlet of the high pressure cylinder 2 is connected with a small steam turbine 6 through a pipeline, the small steam turbine 6 drives a small steam turbine feed water pump 9 to rotate, the small steam turbine feed water pump 9 is connected with the water inlet of a high pressure regenerative heater 10, the water outlet of the high pressure regenerative heater 10 is finally connected with the boiler 1, the steam extraction of the high pressure cylinder 2 is connected with the pipe side of the high pressure regenerative heater 10 through a pipeline, the low pressure steam storage tank 15 and the high pressure steam storage tank 17 are both connected with the steam ejector 14, the steam ejector 14 is connected with the heat source side inlet of a steam ejector heat exchanger 13 of the high pressure feed water bypass, the heat source side outlet of the steam ejector heat exchanger 13 is connected with a deaerator 8, the deaerator 8 is connected with the small turbine feed pump 9, and the steam ejector heat exchanger 13 is connected with the small turbine feed pump 9 and the boiler 1. The low pressure cylinder 3 is connected with the condenser 4, the condenser 4 is connected with the steam exhaust pipeline of the small turbine 6 and the condensate pump 5, the condensate pump 5 is connected with the deaerator 8, and the deaerator 8 is connected with the water feed pump 9 of the small turbine.
A low-pressure steam storage tank steam extraction valve 19 is arranged on a connecting pipeline between the low-pressure steam storage tank 3 and the low-pressure steam storage tank 15, and a steam ejector low-pressure valve 16 is arranged on a connecting pipeline between the low-pressure steam storage tank 15 and the steam ejector 14. A high-pressure steam storage tank steam extraction valve 20 is arranged on a connecting pipeline between the low-pressure cylinder 3 and the high-pressure steam storage tank 17, and a steam ejector high-pressure valve 18 is arranged on a connecting pipeline between the high-pressure steam storage tank steam extraction valve 20 and the steam ejector 14. And a small turbine inlet adjusting valve 7 is arranged on a connecting pipeline between the high-pressure cylinder 2 and the small turbine 6.
The high-pressure feed water bypass comprises an electric feed water pump 11, the upper stream of the electric feed water pump 11 is connected with a deaerator 8, the lower stream of the electric feed water pump is connected with a cold source side inlet of a steam ejector heat exchanger 13, and a cold source side outlet of the steam ejector heat exchanger 13 is connected with a boiler 1. A high pressure bypass regulating valve 12 is arranged on a connecting pipeline of the electric water feeding pump 11 and the steam ejector heat exchanger 13.
A working method of a high-feed water bypass frequency modulation system of a thermal power plant with a steam ejector comprises the following steps:
when the unit is operated, pumping steam of the low pressure cylinder 3 is sent into the low pressure steam storage tank 15 and the high pressure steam storage tank 17;
in the load reducing process of the unit, the opening of the small steam turbine inlet regulating valve 7 is increased, the steam flow of the high-pressure cylinder 2 entering the small steam turbine 6 is increased, the flow of the small steam turbine feed water pump 9 is increased, the steam flow entering the small steam turbine 6 is increased, the inlet water flow of the high-pressure regenerative heater 10 is increased, the heat exchange temperature rise of the pipe side of the high-pressure regenerative heater 10 is reduced, the temperature of the outlet of the pipe side of the high-pressure regenerative heater 10 is reduced, the shell side pressure of the high-pressure regenerative heater 10 is reduced, the pressure difference between the upper side and the lower side of a steam extraction pipeline between the high-pressure cylinder 2 and the high-pressure regenerative heater 10 is increased, the steam extraction steam flow of the high-pressure regenerative heater 10 is increased, the steam flow entering the steam turbine for doing work is reduced, and the output power of the steam turbine is reduced; the steam extraction amount of the high-pressure regenerative heater 10 is increased, the heat obtained at the water supply outlet of the high-pressure regenerative heater 10 is increased, the flow of a high-pressure water supply bypass is reduced, the opening degrees of a low-pressure valve 16 of the steam ejector and a high-pressure valve 18 of the steam ejector are reduced, the steam fed into the steam ejector 14 is reduced, and the heat absorbed by bypass water supply from a heat pump is reduced;
in the process of the load increase of the unit, the opening of the small steam turbine inlet regulating valve 7 is reduced, the steam quantity of the small steam turbine 6 is reduced, the steam quantity of the high-pressure cylinder 2 entering the small steam turbine 6 is reduced, the flow of the small steam turbine feed water pump 9 is reduced, the steam quantity entering the small steam turbine is reduced, the inlet water flow of the high-pressure regenerative heater 10 is reduced, the heat exchange temperature rise of the tube side of the high-pressure regenerative heater 10 is increased, the temperature of the outlet of the tube side of the high-pressure regenerative heater 10 is increased, the shell side pressure of the high-pressure regenerative heater 10 is increased, the pressure difference between the high-pressure cylinder 2 and the high-pressure regenerative heater 10 on the upper side and the lower side of a steam extraction pipeline is reduced, the steam extraction quantity of the high-pressure regenerative heater 10 is reduced, the steam quantity entering the steam turbine for doing work is increased, and therefore the output power of the steam turbine is increased; the steam extraction amount of the high-pressure regenerative heater 10 is reduced, the heat obtained at the water supply outlet of the high-pressure regenerative heater 10 is reduced, the high-pressure feed bypass regulating valve 12 is opened, and the water is supplied by the electric water supply pump 11 of the high-pressure feed bypass. Because the steam extraction amount is reduced, in order to improve the water supply temperature after the steam extraction amount and the steam ejector high-pressure valve are mixed, the opening degrees of the low-pressure valve 16 of the steam ejector and the high-pressure valve 18 of the steam ejector are increased, the high-pressure water supply bypass is heated by the steam ejector heat exchanger 13 and then is mixed with the water discharged by the high-pressure heater, the heat absorbed by the bypass water supply from the heat pump is increased, and the water supply temperature of the boiler is stabilized.
The steam ejector is applied to the thermal power generating unit, and the steam storage tank is configured to participate in frequency modulation, so that the frequency modulation participating capability of the thermal power generating unit is improved.
Claims (10)
1. The utility model provides a high pressure feed water bypass frequency modulation system of thermal power plant who disposes steam ejector, a serial communication port, including boiler (1), boiler (1) is connected high pressure jar (2), low pressure jar (3) is connected in high pressure jar (2), the extraction steam of low pressure jar (3) is respectively through tube coupling low pressure steam storage tank (15) and high pressure steam storage tank (17), the steam outlet of high pressure jar (2) is through tube coupling little steam turbine (6), little steam turbine (6) drive little steam turbine feed pump (9), the water inlet of high pressure backheat heater (10) is connected to little steam turbine feed pump (9), boiler (1) is connected to the delivery port of high pressure backheat heater (10), the extraction steam of high pressure jar (2) passes through the tube side of tube coupling high pressure backheat heater (10) of tube coupling, steam ejector (14) are all connected to low pressure steam storage tank (15) and high pressure steam storage tank (17), steam ejector (14) are connected the heat source side of high pressure feed water bypass steam ejector heat exchanger (13) that adds water bypass The inlet and the outlet of the heat source side of the steam ejector heat exchanger (13) are connected with a deaerator (8), the deaerator (8) is connected with a small turbine water-feeding pump (9), and the steam ejector heat exchanger (13) is connected with the small turbine water-feeding pump (9) and the boiler (1).
2. The high-feed-water bypass frequency modulation system of the thermal power plant with the steam ejector as claimed in claim 1, wherein a low-pressure steam storage tank steam extraction valve (19) is arranged on a connecting pipeline between the low-pressure steam cylinder (3) and the low-pressure steam storage tank (15), and a steam ejector low-pressure valve (16) is arranged on a connecting pipeline between the low-pressure steam storage tank (15) and the steam ejector (14).
3. The high-feed water bypass frequency modulation system of the thermal power plant with the steam ejector as claimed in claim 1, wherein a high-pressure steam storage tank steam extraction valve (20) is arranged on a connecting pipeline between the low-pressure cylinder (3) and the high-pressure steam storage tank (17), and a steam ejector high-pressure valve (18) is arranged on a connecting pipeline between the high-pressure steam storage tank steam extraction valve (20) and the steam ejector (14).
4. The high-feed water bypass frequency modulation system of the thermal power plant with the steam ejector as claimed in claim 1, wherein a small turbine inlet adjusting valve (7) is arranged on a connecting pipeline between the high-pressure cylinder (2) and the small turbine (6).
5. The high-feed water bypass frequency modulation system provided with the steam ejector and used in the thermal power plant is characterized in that the low-pressure cylinder (3) is connected with a condenser (4), the condenser (4) is connected with a steam exhaust pipeline of a small turbine (6) and a condensate pump (5), the condensate pump (5) is connected with a deaerator (8), and the deaerator (8) is connected with a water feed pump (9) of the small turbine.
6. The thermal power plant high-feed water bypass frequency modulation system provided with the steam ejector as claimed in claim 1, wherein the high-feed water bypass comprises an electric feed water pump (11), the upstream of the electric feed water pump (11) is connected with a deaerator (8), the downstream of the electric feed water pump is connected with a cold source side inlet of the steam ejector heat exchanger (13), and a cold source side outlet of the steam ejector heat exchanger (13) is connected with the boiler (1).
7. The high-feed water bypass frequency modulation system of the thermal power plant with the steam ejector as claimed in claim 6, wherein a high-feed bypass adjusting valve (12) is arranged on a connecting pipeline between the electric feed water pump (11) and the steam ejector heat exchanger (13).
8. The operating method of the thermal power plant high-feed water bypass frequency modulation system with the steam ejector as claimed in claim 1, is characterized by comprising the following steps:
when the unit is operated, pumping steam of the low-pressure cylinder (3) is sent into a low-pressure steam storage tank (15) and a high-pressure steam storage tank (17);
in the load reducing process of the unit, the steam flow entering a small steam turbine (6) from a high-pressure cylinder (2) is increased, the flow of a water feeding pump (9) of the small steam turbine is increased, the steam flow entering the small steam turbine (6) is increased, the water flow at the inlet of a high-pressure regenerative heater (10) is increased, the heat exchange temperature rise at the tube side of the high-pressure regenerative heater (10) is reduced, the temperature at the outlet of the tube side of the high-pressure regenerative heater (10) is reduced, the pressure at the shell side of the high-pressure regenerative heater (10) is reduced, the pressure difference between the upper side and the lower side of a steam extraction pipeline between the high-pressure cylinder (2) and the high-pressure regenerative heater (10) is increased, the steam extraction quantity of the high-pressure regenerative heater (10) is increased, the steam flow entering the steam turbine for applying work is reduced, and the output power of the steam turbine is reduced; the steam extraction amount of the high-pressure regenerative heater (10) is increased, the heat obtained at the water supply outlet of the high-pressure regenerative heater (10) is increased, the flow of a high-pressure water supply bypass is reduced, the steam fed into the steam ejector (14) is reduced, and the heat absorbed by bypass water from the heat pump is reduced;
in the load increasing process of the unit, the steam flow of the steam turbine (6) is reduced, the steam flow of the high-pressure cylinder (2) entering the small steam turbine (6) is reduced, the flow of a water feeding pump (9) of the small steam turbine is reduced, the steam flow entering the small steam turbine is reduced, the inlet water flow of the high-pressure regenerative heater (10) is reduced, the heat exchange temperature rise of the pipe side of the high-pressure regenerative heater (10) is increased, the outlet temperature of the pipe side of the high-pressure regenerative heater (10) is increased, the pressure of the shell side of the high-pressure regenerative heater (10) is increased, the pressure difference between the high-pressure cylinder (2) and the high-pressure regenerative heater (10) on the upper side and the lower side of a steam extraction pipeline is reduced, the steam extraction amount of the high-pressure regenerative heater (10) is reduced, the steam flow entering the steam turbine for doing work is increased, and therefore the output power of the steam turbine is increased; the steam extraction amount of the high-pressure regenerative heater (10) is reduced, the heat obtained at the water supply outlet of the high-pressure regenerative heater (10) is reduced, the flow of the high-pressure water supply bypass is increased, the steam sent into the steam ejector (14) is increased, and the heat absorbed by the bypass water from the heat pump is increased.
9. The working method of the high-feed-water bypass frequency modulation system of the thermal power plant with the steam ejector is characterized in that in the load reduction process of the unit, the opening degree of the small steam turbine inlet adjusting valve (7) is increased, and the opening degrees of the steam ejector low-pressure valve (16) and the steam ejector high-pressure valve (18) are reduced.
10. The working method of the high-feed-water bypass frequency modulation system of the thermal power plant with the steam ejector is characterized in that the opening degree of the small steam turbine inlet adjusting valve (7) is reduced, and the opening degrees of the steam ejector low-pressure valve (16) and the steam ejector high-pressure valve (18) are increased in the unit load-up process.
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| CN202210590706.2A CN114837757B (en) | 2022-05-27 | 2022-05-27 | High-water-adding bypass frequency modulation system of thermal power plant provided with steam ejector and working method |
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| CN202210590706.2A CN114837757B (en) | 2022-05-27 | 2022-05-27 | High-water-adding bypass frequency modulation system of thermal power plant provided with steam ejector and working method |
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| CN114837757A true CN114837757A (en) | 2022-08-02 |
| CN114837757B CN114837757B (en) | 2023-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115506863A (en) * | 2022-10-24 | 2022-12-23 | 西安热工研究院有限公司 | Double-bypass high-low position arrangement frequency decoupling control thermodynamic system |
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