CN111255536A - FCB operation method of gas-steam unit power plant - Google Patents
FCB operation method of gas-steam unit power plant Download PDFInfo
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- CN111255536A CN111255536A CN202010076069.8A CN202010076069A CN111255536A CN 111255536 A CN111255536 A CN 111255536A CN 202010076069 A CN202010076069 A CN 202010076069A CN 111255536 A CN111255536 A CN 111255536A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
- F01K23/101—Regulating means specially adapted therefor
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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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
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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
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/10—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating characterised by the engine exhaust pressure
- F01K7/12—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating characterised by the engine exhaust pressure of condensing type
- F01K7/14—Control means specially adapted therefor
Abstract
The invention relates to the technical field of power generation, and discloses an FCB operation method of a gas-steam unit power plant, which can instantly throw off all external power supply loads and an external power grid to be separated and enter island operation when an external power grid fault occurs in a power plant unit, so that the steam unit enters an idle running state, a gas turbine is not stopped, self power utilization of the power plant is maintained, the power plant unit does not need to be stopped when the power grid fault occurs, starting of a power generating unit is reduced, and fuel and station service power consumed when the power plant unit is started are saved; and open the main pipe system of start-up boiler pre-heating auxiliary steam after island operation a period of time, can prevent that island operation duration overlength from leading to the auxiliary steam system can't satisfy the needs that the unit started, make the auxiliary steam system can provide steam for exhaust-heat boiler and steam turbine pressure boost, warm pipe, pressure and the temperature needs of warm-up fast when being incorporated into the power networks again, shorten and start the duration, reduce and start fuel consumption.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to an FCB operation method of a gas-steam unit power plant.
Background
In recent years, with the rapid development of national economy, the demand of society for electric power is increasing. The power grid becomes huge day by day, and the safety of the power grid is also tested seriously. The large-area power failure accidents occur in various countries around the world, including power-developed countries such as the United states, Canada, Britain, Russia, Italy and the like, and the large-area power failure is also caused by the power grid icing accident occurring in the south of 2008 in China. These accidents result in partial collapse or isolated operation of the grid and a total power outage at the power plant. When a power grid accident occurs to a power plant unit, unit parameters are changed violently, and unit equipment is out of control due to loss of service power, so that equipment damage caused by the accident is easily caused. Meanwhile, the power plant can be started only when the power grid is passively waited for to be recovered under the condition that a power supply is not started, the recovery time of the power grid is prolonged, part of the power plants adopt black-start equipment, but the common black-start unit is large in investment and high in maintenance cost. Therefore, in the state of a power grid accident, how to improve the self-healing capability of the power grid, quickly recover the power supply of the power grid, and ensure the service power supply of a power plant is particularly important for a power system, so that the realization of the FCB function brings more and more importance to the power grid and the power plant.
FASTCUTBACK, a fast de-rated power of a unit, referred to as FCB for short, means that when the unit operates above a certain load (e.g., 35% ECR), all external power supply loads are instantly thrown away due to internal or external (power grid) faults and grid disconnection, but under the condition that no boiler or combustion engine trips occur, the fast de-rated power maintains the automatic control function of 'generator disconnection with service power'. According to the planning of urban base-preserving power supplies by power grid companies in various regions, most of gas-electricity projects require the unit FCB function, when the power grid fails, the power is quickly reduced to maintain the operation of the unit with the service power of the power grid when the unit is disconnected with the power grid, and the power grid can be quickly supplied when the power grid is recovered and started.
For a split-shaft or single-shaft gas-steam combined cycle unit with a 3S clutch, FCB is easy to realize, and can be realized only by stopping a steam turbine and carrying service power by low-load operation of a combustion engine under the working condition. For the combined cycle unit without the 3S clutch, the FCB working condition means that the plant power consumption is low, so that only the gas turbine can run and the steam turbine idles, the unit is not provided with a bypass chimney, a steam-water pipeline between the waste heat boiler and the steam turbine is short, the pressure drop and the temperature drop are small, and the heat efficiency is high; a100% steam bypass system needs to be configured, the loading speed of the gas turbine cannot be as high as that of a simple circulation loading speed, and the no-load and low-load operation time is correspondingly prolonged according to the pressure and temperature requirements of boosting, warming and warming of the waste heat boiler and the steam turbine, so that the whole starting process of the unit is prolonged, and the starting fuel consumption is increased. An existing gas-steam combined cycle unit is generally provided with a main steam and reheat steam system, a condensate system, an auxiliary steam system, a condenser vacuumizing system, an open cooling water system, a circulating cooling water system, a drainage water system, a compressed air system, a steam turbine body shaft seal system, main engine lubricating oil, control oil, a sealing oil system and the like.
Disclosure of Invention
The invention aims to provide an FCB operation method of a gas-steam unit power plant, which can maintain low output operation of a unit and shorten the time for re-grid connection starting of the unit.
In order to achieve the above object, the present invention provides an FCB operation method of a gas-steam unit power plant, characterized by comprising the steps of:
s1: setting a gas unit and a steam unit according to the FCB operation requirement;
s2: when a fault occurs, the control device issues a cutter cutting instruction to enter an FCB running state;
s3: after the gas-steam unit receives the FCB starting signal, rapidly load shedding enters an island operation state;
s4: when the island operates for a period of time, starting a boiler to an auxiliary steam main pipe to pre-warm an auxiliary steam main pipe system;
s5: and when the grid fault is eliminated, the unit is re-connected to the grid and transmits power to the grid.
Preferably, in step S4, after the islanding operation is performed, when the low-pressure main steam parameters, such as the low-pressure main steam flow, the low-pressure main steam pressure, or the low-pressure main steam temperature, of the exhaust-heat boiler cannot meet the requirement of the low-pressure cylinder cooling steam parameter, the DCS opens the gate valve of the auxiliary steam supply main pipe of the start boiler and the stop valve of the auxiliary steam main pipe supply unit in a linkage manner, opens the auxiliary steam supply low-pressure cylinder cooling pipeline in a linkage manner, gradually closes the cold steam supply main pipe and the auxiliary steam supply main pipe, and supplies the low-pressure cylinder cooling steam and the shaft seal steam by the start boiler.
Preferably, step S3 includes:
(1) the gas turbine starts a quick load shedding action to rapidly shed the load to the service load;
(2) the bypass valve of the combustion chamber is fully opened;
(3) main and reheat steam systems: the high, medium and low pressure main steam valves are closed quickly, and after 20s, the low pressure main steam regulating valve is reset to the cooling steam inlet opening; meanwhile, the high, medium and low pressure bypass valves are opened and discharged to the condenser quickly; opening the high-exhaust ventilation valve and each drain valve;
(4) condensate system: the condensate pump standby pump is started in a linkage manner, the bypass valve of the steam turbine is opened to reduce the temperature, the steam exhaust water spraying temperature reduction valve of the low-pressure cylinder is opened, and the water curtain water spraying valve of the condenser is opened;
(5) the system comprises a condenser vacuumizing system, an open cooling water system, a circulating cooling water system, a drainage water system, a compressed air system, a steam turbine body shaft seal system, main engine lubricating oil, control oil, sealing oil systems and the like, and the normal operation is maintained.
Preferably, step S4 further includes:
(6) an auxiliary steam system: and (5) quickly opening the valve, then opening the auxiliary steam supply regulating valve to a normal opening, and interlocking and opening the auxiliary steam supply electric valve to the shaft seal system and the auxiliary steam supply low-pressure cylinder cooling pipe electric valve.
As the preferred scheme, the TCS is used for realizing the maintenance of the cooling steam inlet opening degree of the low-pressure main steam control valve; and the DCS is linked to open the low-pressure cylinder steam-exhaust water-spraying temperature-reducing valve and adjust the opening of the low-pressure cylinder steam-exhaust water-spraying adjusting valve.
As the preferred scheme, when the exhaust temperature of the low-pressure cylinder is too high, the bypass electric valve of the exhaust water spray regulating valve of the low-pressure cylinder is opened in a linkage manner.
Preferably, when the exhaust temperature of the low-pressure cylinder is higher than 120 degrees, the bypass electric valve of the exhaust water spray regulating valve of the low-pressure cylinder is opened in a linkage manner.
Preferably, in step S2, the fault includes the generator outlet switch being in the on-position when the main transformer high-side switch of the switchgear is tripped.
Preferably, in step S4, when the islanding operation exceeds 2h, the start-up boiler is opened to the auxiliary steam main to pre-warm the auxiliary steam main system.
Compared with the prior art, the FCB operation method of the gas-steam combined cycle unit has the beneficial effects that:
1. the invention can instantly throw off all external power supply loads and the external power grid are disconnected to enter island operation when the external power grid of the power plant unit has a fault, so that the steam unit enters an idle running state, and the gas turbine is not stopped, thereby maintaining the self-power consumption of the power plant, avoiding the stop of the power plant unit when the power grid has an accident, reducing the start of the power plant unit and saving the fuel and the station service power consumed when the power plant unit is started; and open the main pipe system of start-up boiler pre-heating auxiliary steam after island operation a period of time, can prevent that island operation duration overlength from leading to the auxiliary steam system can't satisfy the needs that the unit started, make the auxiliary steam system can provide steam for exhaust-heat boiler and steam turbine pressure boost, warm pipe, pressure and the temperature needs of warm-up fast when being incorporated into the power networks again, shorten and start the duration, reduce and start fuel consumption.
2. According to the invention, by monitoring the low-pressure main steam parameter value of the waste heat boiler, when the low-pressure main steam parameter value is low, the low-pressure cylinder cooling steam and the shaft seal steam are provided by the starting boiler through the auxiliary steam system, so that the whole starting process of the unit can be shortened. The steam unit carries out load shedding by closing steam inlet and steam exhaust. Wherein, open cold again to assist vapour and supply vapour governing valve and assist vapour and supply low pressure cylinder cooling tube motorised valve, let in cold steam at the low pressure cylinder, reduce the blast loss that the turbine friction heats. The bypass electric valve of the low-pressure cylinder steam-discharging water-spraying temperature-reducing valve, the low-pressure cylinder steam-discharging water-spraying regulating valve and the low-pressure cylinder steam-discharging water-spraying regulating valve is opened to control the steam-discharging temperature of the low-pressure cylinder, so that the trip and the shutdown are prevented.
Drawings
FIG. 1 is a schematic view of a gas-steam unit system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of an auxiliary steam system according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, a FCB operation method of a gas-steam unit power plant applied to a gas-steam unit according to a preferred embodiment of the present invention includes the steps of:
s1: setting a gas unit and a steam unit according to the FCB operation requirement;
s2: when a fault occurs, the control device issues a cutter cutting instruction to enter an FCB running state;
s3: after the gas-steam unit receives the FCB starting signal, rapidly load shedding enters an island operation state;
s4: when the island operates for a period of time, starting a boiler to an auxiliary steam main pipe to pre-warm an auxiliary steam main pipe system;
s5: and when the grid fault is eliminated, the unit is re-connected to the grid and transmits power to the grid.
According to the embodiment, when an external power grid fault occurs, a power plant unit instantly throws off all external power supply loads to be disconnected with the external power grid and enters island operation, so that the steam unit enters an idle running state, and the gas turbine is not stopped, so that the self-power utilization of the power plant is maintained, the power plant unit does not need to be stopped when the power grid fault occurs, the starting of the power plant unit is reduced, and fuel and station service power consumed when the power plant unit is started are saved; and open the main pipe system of start-up boiler pre-heating auxiliary steam after island operation a period of time, can prevent that island operation duration overlength from leading to the auxiliary steam system can't satisfy the needs that the unit started, make the auxiliary steam system can provide steam for exhaust-heat boiler and steam turbine pressure boost, warm pipe, pressure and the temperature needs of warm-up fast when being incorporated into the power networks again, shorten and start the duration, reduce and start fuel consumption.
Further, in step S4, after the islanding operation is performed, when the low-pressure main steam parameters such as the low-pressure main steam flow rate, the low-pressure main steam pressure, or the low-pressure main steam temperature of the exhaust-heat boiler cannot meet the requirement of the low-pressure cylinder cooling steam parameter, the DCS opens the gate valve of the auxiliary steam main supply pipe of the start boiler, the stop valve of the auxiliary steam main supply unit, and the DCS opens the auxiliary steam main supply low-pressure cylinder cooling pipeline in a linkage manner, gradually closes the cold auxiliary steam supply pipeline, the start boiler supplies the low-pressure cylinder cooling steam and the shaft seal steam, by monitoring the low-pressure main steam parameter value of the exhaust-heat boiler, when the low-pressure main steam parameter value is low, the start boiler supplies the low-pressure cylinder cooling steam and the shaft seal steam through the auxiliary steam system, so that the exhaust-heat boiler maintains a certain temperature, and maintains the low-pressure cylinder cooling steam, after the re-grid connection condition is achieved, the whole starting process of the unit can be shortened.
The present embodiment includes the following steps in the fast load dump of step S3:
(1) the gas turbine starts a quick load shedding action to rapidly shed a load to an auxiliary power load, the openness of a main fuel pressure control valve and a main fuel flow control valve of the embodiment is reduced, the openness of an on-duty fuel pressure control valve and an on-duty fuel flow control valve is increased, and the flame stability is maintained;
(2) the combustor bypass valve is fully closed to fully open;
(3) main and reheat steam systems: the high, medium and low pressure main steam valves are closed quickly, and after 20s, the low pressure main steam regulating valve is reset to the cooling steam inlet opening; meanwhile, the high, medium and low pressure bypass valves are opened and discharged to the condenser quickly; opening the high-exhaust ventilation valve and each drain valve;
(4) condensate system: the condensate pump standby pump is started in a linkage manner, the bypass valve of the steam turbine is opened to reduce the temperature, the steam exhaust water spraying temperature reduction valve of the low-pressure cylinder is opened, and the water curtain water spraying valve of the condenser is opened;
(5) a condenser vacuumizing system, an open cooling water system, a circulating cooling water system, a drainage water system, a compressed air system, a steam turbine body shaft seal system, main engine lubricating oil, control oil, sealing oil system and the like maintain normal operation;
(6) an auxiliary steam system: and (3) quickly opening the cooling and then opening the auxiliary steam supply regulating valve to a normal opening, interlocking and opening an auxiliary steam supply electric valve to the shaft seal system and an auxiliary steam supply low-pressure cylinder cooling pipe electric valve, and introducing cold steam into the low-pressure cylinder to reduce blast loss caused by friction heating of the steam turbine.
In the embodiment, the low-pressure main steam control valve is reset to the cooling steam inlet opening, and the TCS is used for maintaining the cooling steam inlet opening of the low-pressure main steam control valve; the DCS is used for opening the low-pressure cylinder steam-exhaust water-spraying temperature-reducing valve in a linkage manner and adjusting the opening degree of the low-pressure cylinder steam-exhaust water-spraying adjusting valve; the exhaust temperature of the low-pressure cylinder is controlled to prevent the trip and the shutdown. And when the exhaust temperature of the low-pressure cylinder is overhigh, the bypass electric valve of the exhaust water spray regulating valve of the low-pressure cylinder is opened in a linkage manner. In the embodiment, when the exhaust temperature of the low-pressure cylinder is higher than 120 degrees, the bypass electric valve of the exhaust water spray regulating valve of the low-pressure cylinder is opened in a linkage manner.
In step S2, the fault includes that when the main-transformer high-voltage side switch of the unit is tripped and the generator outlet switch is in the on-state, the FCB operation state is triggered to enter when the main-transformer high-voltage side switch of the unit is tripped and the generator outlet switch is in the on-state. And in step S4, when the island operation time exceeds 2h, the starting boiler is opened to the auxiliary steam main pipe to pre-warm the auxiliary steam main pipe system. Meanwhile, when the FCB operates, the exhaust temperature of a high-pressure cylinder of the DCS system, the internal metal temperature of a steam turbine in the TCS system, the exhaust pressure and the temperature of a low-pressure cylinder are closely monitored, the condition that the exhaust temperature of the high-pressure cylinder, the internal metal temperature of the steam turbine in the system, the exhaust pressure and the temperature of the low-pressure cylinder are higher than set values determined according to the condition of a unit for ensuring safe and normal operation of the unit is avoided, and the trip stop is prevented.
To sum up, the embodiment of the present invention provides an FCB operation method for a gas-steam combined cycle unit, which enables a power plant unit to instantly throw off all external power supply loads to be disconnected from an external power grid and enter an island operation when an external power grid fault occurs, enables the steam unit to enter an idle state, and enables a gas turbine not to stop, thereby maintaining self power consumption of the power plant, avoiding a stop during a power grid accident, reducing the start-up of the power plant, and saving fuel and station service power consumed when the unit is started; and open the main pipe system of start-up boiler pre-heating auxiliary steam after island operation a period of time, can prevent that island operation duration overlength from leading to the auxiliary steam system can't satisfy the needs that the unit started, make the auxiliary steam system can provide steam for exhaust-heat boiler and steam turbine pressure boost, warm pipe, pressure and the temperature needs of warm-up fast when being incorporated into the power networks again, shorten and start the duration, reduce and start fuel consumption.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A FCB operation method of a gas-steam unit power plant is characterized by comprising the following steps:
s1: setting a gas unit and a steam unit according to the FCB operation requirement;
s2: when a fault occurs, the control device issues a cutter cutting instruction to enter an FCB running state;
s3: after the gas-steam unit receives the FCB starting signal, rapidly load shedding enters an island operation state;
s4: when the island operates for a period of time, starting a boiler to an auxiliary steam main pipe to pre-warm an auxiliary steam main pipe system;
s5: and when the grid fault is eliminated, the unit is re-connected to the grid and transmits power to the grid.
2. The FCB operation method of the gas-steam unit power plant of claim 1, wherein in step S4, when a low-pressure main steam parameter such as a low-pressure main steam flow rate, a low-pressure main steam pressure, or a low-pressure main steam temperature of the exhaust-heat boiler fails to meet a low-pressure cylinder cooling steam parameter requirement after entering an island operation, a gate valve of an auxiliary steam supply main pipe of the start-up boiler and a stop valve of the auxiliary steam supply main pipe unit are opened by DCS linkage, an auxiliary steam supply low-pressure cylinder cooling pipeline is opened by DCS linkage, cold steam is gradually closed to the auxiliary steam supply main pipe, and low-pressure cylinder cooling steam and shaft seal steam are provided by the start-up boiler.
3. The FCB operation method of a gas-steam unit plant according to claim 1, wherein in step S3, it comprises:
(1) the gas turbine starts a quick load shedding action to rapidly shed the load to the service load;
(2) the bypass valve of the combustion chamber is fully opened;
(3) main and reheat steam systems: the high, medium and low pressure main steam valves are closed quickly, and after 20s, the low pressure main steam regulating valve is reset to the cooling steam inlet opening; meanwhile, the high, medium and low pressure bypass valves are opened and discharged to the condenser quickly; opening the high-exhaust ventilation valve and each drain valve;
(4) condensate system: the condensate pump standby pump is started in a linkage manner, the bypass valve of the steam turbine is opened to reduce the temperature, the steam exhaust water spraying temperature reduction valve of the low-pressure cylinder is opened, and the water curtain water spraying valve of the condenser is opened;
(5) the system comprises a condenser vacuumizing system, an open cooling water system, a circulating cooling water system, a drainage water system, a compressed air system, a steam turbine body shaft seal system, main engine lubricating oil, control oil, sealing oil systems and the like, and the normal operation is maintained.
4. The FCB operation method of a gas-steam unit plant according to claim 3, further comprising, in step S4:
(6) an auxiliary steam system: and (5) quickly opening the valve, then opening the auxiliary steam supply regulating valve to a normal opening, and interlocking and opening the auxiliary steam supply electric valve to the shaft seal system and the auxiliary steam supply low-pressure cylinder cooling pipe electric valve.
5. The FCB operation method of a gas-steam unit power plant of claim 3, wherein maintaining a cooling admission opening by the TCS is implemented as a low pressure main steam damper; and the DCS is linked to open the low-pressure cylinder steam-exhaust water-spraying temperature-reducing valve and adjust the opening of the low-pressure cylinder steam-exhaust water-spraying adjusting valve.
6. The FCB operating method of a gas-steam unit power plant of claim 5, wherein when the low-pressure cylinder exhaust steam temperature is too high, a bypass electric valve of the low-pressure cylinder exhaust steam spray water regulating valve is opened in a linkage manner.
7. The FCB operating method of a gas-steam unit power plant of claim 6, wherein the bypass electric valve of the low pressure cylinder steam exhaust water injection regulating valve is opened in a linkage manner when the low pressure cylinder steam exhaust temperature is higher than 120 °.
8. The FCB operation method of a gas-steam unit plant of claim 1, wherein in step S2, the fault comprises tripping a main unit main transformer high-voltage side switch but the generator outlet switch is in a closed position.
9. The FCB operation method of a gas-steam unit plant according to claim 1, wherein in step S4, when the islanding operation exceeds 2h, the start-up boiler is opened to the auxiliary steam main to pre-warm the auxiliary steam main system.
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| CN112865175A (en) * | 2021-01-08 | 2021-05-28 | 西安热工研究院有限公司 | FCB operation method of garbage power plant |
| CN112984613A (en) * | 2021-03-02 | 2021-06-18 | 华能山东石岛湾核电有限公司 | Maintenance method for nuclear power plant heating system during shutdown period |
| CN114060110A (en) * | 2021-11-16 | 2022-02-18 | 西安热工研究院有限公司 | Bypass heating heat cascade utilization system and method capable of supplying black start power supply |
| CN114592936A (en) * | 2022-03-18 | 2022-06-07 | 中国能源建设集团广东省电力设计研究院有限公司 | Cooling steam supply method and device based on gas-steam combined cycle unit |
| CN114719191A (en) * | 2022-03-23 | 2022-07-08 | 华北电力科学研究院有限责任公司 | Pipeline pre-warming method, system and controller |
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| CN114592936A (en) * | 2022-03-18 | 2022-06-07 | 中国能源建设集团广东省电力设计研究院有限公司 | Cooling steam supply method and device based on gas-steam combined cycle unit |
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