CN111879168A - Air cooling coupling operation system arrangement of steam-electric double-drive feed pump of thermal power plant and control method thereof - Google Patents
Air cooling coupling operation system arrangement of steam-electric double-drive feed pump of thermal power plant and control method thereof Download PDFInfo
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- CN111879168A CN111879168A CN202010837396.0A CN202010837396A CN111879168A CN 111879168 A CN111879168 A CN 111879168A CN 202010837396 A CN202010837396 A CN 202010837396A CN 111879168 A CN111879168 A CN 111879168A
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- 238000001816 cooling Methods 0.000 title claims abstract description 133
- 230000008878 coupling Effects 0.000 title claims abstract description 21
- 238000010168 coupling process Methods 0.000 title claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
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- 230000006978 adaptation Effects 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 8
- 238000005507 spraying Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
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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
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/04—Auxiliary systems, arrangements, or devices for feeding, collecting, and storing cooling water or other cooling liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F25/00—Component parts of trickle coolers
- F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
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Abstract
The invention relates to an air cooling coupling operation system arrangement of a steam-electricity-carrying double-drive water feeding pump of a thermal power plant and a control method thereof, wherein the water feeding pump is connected with a small steam turbine and a motor; the main steam turbine is sequentially connected with the steam exhaust device and the direct air cooling system through a first dead steam main pipeline; the first main dead steam pipeline is additionally provided with a first branch pipeline connected with the compound indirect cooling system, and a third valve is arranged on the first main dead steam pipeline; the small steam turbine is connected with the steam exhaust device through a second dead steam main pipeline; a second valve is arranged on the second main dead steam pipeline, and a second branch pipeline is also additionally arranged and connected with the compound indirect cooling system; the second branch pipeline is provided with a first valve, and the inflow end of the second branch pipeline is positioned at the upstream of the second valve; the invention can adapt to the influence of environmental temperature change and steam-electricity double-drive switching on the backpressure of the unit, and realizes the adaptation of the cold end to the working condition change of the side of the steam turbine and the environmental temperature change by adopting the coupling arrangement and operation mode of direct air cooling and indirect air cooling, thereby realizing the purposes of low backpressure, energy saving, manufacturing reduction and efficiency improvement all year round.
Description
Technical Field
The invention relates to an arrangement scheme of an air cooling coupling operation system of a steam-electric double-drive feed pump in a thermal power plant, which is mainly applied to a steam turbine steam exhaust and cooling system of the thermal power plant.
Background
In a traditional thermal power plant operation system, a steam-driven or electric or steam-electric double-drive mode is generally selected for driving a feed pump; the cooling system adopts direct air cooling or indirect air cooling. At present, the driving mode of the feed water pump is not much considered to adapt to the ambient temperature, and the coupling operation between the feed water pump and the cooling system is rarely mentioned. Meanwhile, the cooling system generally adopts an indirect air cooling system or a direct air cooling system, the cold end configuration is generally considered according to the maximum steam discharge amount, and the consideration on the running condition of the machine side is not much. Therefore, in the existing system, air cooling configuration redundancy is easy to occur in non-hot seasons, and summer backpressure is easy to be higher in hot seasons, so that the output of the unit is reduced.
Meanwhile, with the increase of the unit capacity and parameters, the requirement of the air cooling unit on low back pressure is stronger, so that the air cooling scale is larger, and the investment of a cold end is huge. And because of the requirement of the flexibility of the power plant, the unit is required to adapt to more complex operating conditions to meet the change requirement of the load.
Therefore, how to solve the above technical problems becomes a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The technical problem solved by the invention is to provide an air cooling coupling operation system arrangement of a steam-electricity double-drive water feeding pump in a thermal power plant, namely, a scheme which is suitable for a power plant adopting a steam-electricity double-drive water feeding pump unit to adopt air cooling operation is provided so as to adapt to the influence of environmental temperature change and steam-electricity double-drive switching on unit backpressure, and the cold end is adapted to the working condition change of a steam engine side and the environmental temperature change by adopting direct air cooling and indirect air cooling coupling arrangement and operation modes, so that the purposes of low back pressure all year around, energy conservation, reduction, manufacturing efficiency and improvement are realized.
The technical means adopted by the invention are as follows.
An air cooling coupling operation system arrangement of a steam-electric double-drive water feeding pump in a thermal power plant comprises a main steam turbine and the water feeding pump, and is characterized in that the water feeding pump is driven by steam-electric double power and is connected with a small steam turbine and a motor; the main steam turbine is sequentially connected with a steam exhaust device and a direct air cooling system through a first dead steam main pipeline; a first branch pipeline is additionally arranged on a first dead steam main pipeline between the steam exhaust device and the direct air cooling system and connected with the compound indirect cooling system, and a third valve DF-03 is arranged on the first branch pipeline; the small steam turbine is connected with the steam exhaust device through a second main exhaust steam pipeline; a second valve DF-02 is arranged on the second main exhaust steam pipeline and is used for opening and closing the exhaust steam communication between the second main exhaust steam pipeline and the steam exhaust device; the second main dead steam pipeline is additionally provided with a second branch pipeline connected with the combined indirect cooling system; and a first valve DF-01 is arranged on the second branch pipeline and used for opening and closing the circulation of the second branch pipeline, and the inflow end of the second branch pipeline is positioned at the upstream of the second valve DF-02.
Furthermore, the combined indirect cooling system comprises a condenser, wherein a circulating pipeline is arranged at one end of the condenser, and a circulating water pump, a finned tube air cooler and an evaporative air cooler are sequentially arranged on the circulating pipeline.
Furthermore, the feed water pump, the small steam turbine and the motor are connected in series, and the small steam turbine and the motor are arranged on the same side.
Further, the outflow end of the second branch conduit is communicated with the first branch conduit to form a junction, and the third valve DF-03 is disposed upstream of the junction.
Further, the direct air cooling system is a direct air cooling radiator.
A control method of an air cooling coupling operation system of a steam-electric double-drive feed pump of a thermal power plant comprises the air cooling coupling operation system arrangement, and the control method of the air cooling coupling operation system arrangement according to different working conditions comprises the following steps: the working condition I is as follows: in summer, the working condition of an electric pump is adopted; the feed pump is driven by the motor, the first valve DF-01 and the second valve DF-02 are closed, the third valve DF-03 is opened, and dead steam discharged by the main steam turbine is respectively borne by the direct air cooling system and the compound indirect cooling system.
Working conditions are as follows: adopting a steam pump working condition in summer; the water supply pump is driven by the small turbine, the first valve DF-01 is closed at the moment, the second valve DF-02 and the third valve DF-03 are opened, and the exhaust steam of the main turbine and the small turbine is shared by the direct air cooling system and the combined indirect cooling system.
Working conditions are as follows: the working condition of a steam pump is adopted in cold seasons; in the working condition, a feed water pump is driven by a small steam turbine to operate, and steam exhaust at a steam side is a main steam turbine and the small steam turbine; the control method of the working condition comprises the following steps: 1) closing a second valve DF-02 and a third valve DF-03, and opening a first valve DF-01 to ensure that the exhaust steam of the main turbine is independently borne by a direct air cooling system and the exhaust steam of the small turbine is independently borne by a combined indirect cooling system; or, 2) closing the first valve DF-01 and the third valve DF-03, and opening the second valve DF-02 to ensure that the exhaust steam of the main turbine and the small turbine is only born by a direct air cooling system; or, 3) closing the first valve DF-01, and opening the second valve DF-02 and the third valve DF-03, so that the exhaust steam of the main turbine and the small turbine is jointly born by a direct air cooling system and a combined indirect cooling system.
The advantageous effects produced by the present invention are as follows.
1. The water-feeding pump adopts the vapour electricity to drive and arranges, and the cold junction adopts the air cooling system, and the air cooling adopts direct air cooling and the indirect air cooling of combined type to arrange in parallel, and this arrangement scheme can realize the optimal operation of cold junction according to ambient temperature variation and water-feeding pump drive mode's change.
2. The direct air cooling and the compound indirect air cooling are arranged in parallel, and the steam discharge amount of the two cooling systems is freely distributed through the change of the condensation side pressure, so that the integral steam discharge back pressure is controlled.
3. The combined type indirect air cooling system is characterized in that the mechanical ventilation indirect air cooling and evaporative cooler series arrangement mode is adopted, the condenser is additionally arranged to be connected with the direct air cooling system in parallel, and the spray water quantity of the evaporative cooler is used for controlling the return water temperature of circulating water, so that the condensation temperature of the steam side of the condenser is controlled, the steam distribution quantity of the combined type cooling system is further controlled, and the influences of the switching of a water feeding pump turbine and the ambient temperature on the cooling system can be effectively adjusted.
4. The combined type indirect air cooling system can be switched as required by additionally arranging the bypass system, the independent operation of the water feeding pump steam turbine and the combined type indirect air cooling system can be realized, the full-system coupling operation can also be adopted, and the flexible multi-combination operation mode is realized so as to adapt to different working condition requirements.
Drawings
Fig. 1 is a flow chart of an arrangement of an air cooling coupling operation system applied to a steam-electric double-drive feed pump of a thermal power plant.
Description of the figure numbers:
10. a main turbine; 20. a generator; 30. a steam exhaust device; 40. a feed pump; 401. a small steam turbine; 402. an electric motor; 50. a direct air-cooling radiator; 60. a condenser; 601. a finned tube air cooler; 602. an evaporative air cooler; 70. and (4) nodes.
Detailed Description
The important improvements of the invention are: in a thermal power plant, the steam side and cold side systems of the whole unit form a circulating system for determining the output of the unit. The steam side is composed of a main steam turbine, a water feeding pump, a small steam turbine (namely a water feeding pump steam turbine) and a coaxial water feeding pump motor, and the steam-electricity double-drive arrangement of the water feeding pump is mainly used for adapting to the air cooling capacity unilaterally so as to reduce the back pressure and the plant power consumption rate of the unit. The cold end system is a direct air cooling and combined indirect air cooling parallel system arrangement, the steam quantity is freely distributed through pressure, the condensing pressure of the combined indirect air cooling condenser is realized through the series arrangement of mechanical ventilation indirect air cooling and an evaporative cooler, the steam quantity distribution of the condensing side is improved through the reduction of the circulating water temperature, and therefore the steam discharge quantity born by the direct air cooling is reduced, and the unit operation backpressure is reduced.
The steam-electricity dual-drive of the water feeding pump is mainly characterized in that the electric pump is hopefully adopted in summer, so that the whole steam discharge quantity of the unit is reduced, and the back pressure in summer can be reduced as much as possible by the fixed direct air cooling system; and in non-summer time, a steam pump is adopted, so that the plant power consumption rate is reduced as much as possible, and the scale and the capacity of direct air cooling are fully utilized. In order to enable the system to meet the high-performance requirements of large capacity, low back pressure requirement, energy conservation, manufacturing reduction and the like of the current unit, the invention provides the air cooling coupling operation system arrangement of the steam-electric double-drive feed pump of the thermal power plant, flexibly meets the requirements of the steam side and the cold end, converts rigidity adjustment into flexible control, enables the system to adapt to the change of the steam side all the year round, meets the requirements of the cold end, and has better energy conservation and manufacturing reduction effects.
The present invention will be further described with reference to the following embodiments and various operating conditions.
Referring to fig. 1, the air-cooling coupled operation system arrangement of the electrified steam-electricity double-drive feed pump of the thermal power plant mainly comprises a main turbine 10 and a feed pump 40, wherein the main turbine 10 is connected with a generator 20, and the main point is that the feed pump 40 is driven by steam-electricity double power and is connected with a small steam turbine 401 and a motor 402; further, the feed water pump 40, the small steam turbine 401 and the electric motor 402 are connected in series, and the small steam turbine 401 and the electric motor 402 are arranged on the same side.
The main steam turbine 10 is sequentially connected with a steam exhaust device 30 and a direct air cooling system through a first steam exhaust main pipeline, and the direct air cooling system is a direct air cooling radiator 50. And a first branch pipeline is additionally arranged on a first steam exhaust main pipeline between the steam exhaust device 30 and the direct air cooling system, and the first branch pipeline is connected with the combined indirect cooling system, so that a parallel relation is formed between the direct air cooling system and the combined indirect cooling system. And a third valve DF-03 is arranged on the first branch pipeline and used for opening and closing the exhaust steam circulation between the first branch pipeline and the first exhaust steam main pipeline.
The small steam turbine 401 is connected with the steam exhaust device 30 through a second main exhaust steam pipeline; a second valve DF-02 is arranged on the second main exhaust steam pipeline and is used for opening and closing the exhaust steam communication between the second main exhaust steam pipeline and the steam exhaust device 30; a second branch pipeline is additionally arranged on the second main dead steam pipeline and is connected with the combined indirect cooling system; and a first valve DF-01 is arranged on the second branch pipeline and used for opening and closing the circulation of the second branch pipeline, and the inflow end of the second branch pipeline is positioned at the upstream of the second valve DF-02.
Further, the outflow end of the second branch conduit communicates with the first branch conduit to form a junction 70, and the third valve DF-03 is disposed upstream of the junction 70. The upstream and the downstream of the invention take the flowing direction of the dead steam as the reference.
Furthermore, the combined indirect cooling system comprises a condenser 60, wherein a circulation pipeline is further arranged at one end of the condenser 60, and a circulation water pump, a finned tube air cooler 601 and an evaporative air cooler 602 are sequentially arranged on the circulation pipeline.
In the embodiment of the present invention, the system layout according to different working conditions includes, but is not limited to, the following modes.
The working condition I is as follows: the working condition of the electric pump is adopted in high temperature seasons in summer. In the working condition, the ambient temperature is very high in summer, the backpressure of the unit faces raised pressure, and the unit is usually in an electricity utilization peak in summer, so that the water feeding pump preferentially adopts a motor 402 driving mode. At this time, the small steam turbine 401 stops operating, and the steam exhaust from the steam side is only the main steam turbine 10; therefore, the first valve DF-01 and the second valve DF-02 are closed, and the third valve DF-03 is opened, so that the dead steam discharged from the main turbine 10 is respectively taken by the direct air cooling system and the combined indirect cooling system.
According to the requirement of back pressure, when the back pressure needs to be further reduced, the water spraying amount of the evaporative air cooler 602 can be increased or dropped, the temperature of circulating water of the combined indirect cooling system is reduced by increasing the water spraying amount of the evaporative air cooler, the temperature of condensed water at the condenser 60 side is further reduced, the steam discharging amount distributed to the combined indirect cooling system is increased, the steam discharging amount discharged into the direct air cooling system is reduced, and the temperature of condensed water of the direct air cooling radiator is reduced; when the pressures of the exhaust steam distribution pipes of the combined indirect cooling system and the direct air cooling system are equal, the exhaust steam distribution ratio of the main turbine 10 is kept unchanged, so that the exhaust steam distribution ratio can be determined by switching the spray system of the evaporative air cooler 602 in the combined indirect cooling system, the cold end capacity is adjusted, and the unit back pressure is affected. Through the coupling operation of the direct air cooling system and the combined indirect cooling system, the back pressure of the unit is effectively controlled, and the high-temperature capacity of the unit is greatly improved.
Working conditions are as follows: the working condition of the steam pump is adopted in summer. The working condition is that the environmental temperature is higher in summer, the backpressure of the unit faces to the raised pressure due to the large exhaust steam quantity, and the unit is often in the peak of power utilization in summer. In the working condition, the small steam turbine 401 operates, the motor 402 stops operating, and steam exhaust on the steam side is the main steam turbine 10 and the small steam turbine 401. Therefore, the first valve DF-01 is closed, the second valve DF-02 and the third valve DF-03 are opened, and the exhaust steam of the main turbine 10 and the small turbine 401 is shared by the direct air cooling system and the compound indirect cooling system.
According to the requirement of back pressure, when the back pressure needs to be further reduced, the water spraying amount of the evaporative air cooler can be input or increased, the circulating water temperature of the combined indirect cooling system is reduced by increasing the water spraying amount of the evaporative air cooler, the temperature of the condensed water at the side of the condenser 60 is further reduced, the steam discharging amount distributed to the combined indirect cooling system is increased, the steam discharging amount discharged into the direct air cooling system is reduced, and the temperature of the condensed water of the direct air cooling radiator 50 is reduced; when the pressures of the exhaust steam distribution pipes of the combined indirect cooling system and the direct air cooling system are equal, the exhaust steam distribution proportion of the main steam turbine and the small steam turbine is kept unchanged, so that the exhaust steam distribution proportion can be determined by switching the spraying system of the evaporative air cooler 602 of the combined indirect cooling system, the cold end capacity is adjusted, and the unit backpressure is influenced. Through the coupling operation of the direct air cooling system and the combined indirect cooling system, the backpressure of the unit is effectively controlled, and the capacity that the unit is at the maximum exhaust steam amount and at the lower backpressure is improved.
Working conditions are as follows: the working condition of the steam pump is adopted in cold seasons. The cold season ambient temperature of this operating mode is lower, and the cold junction is in comparatively abundant stage. In this condition, the small turbine 401 is running, the motor 402 is off, and the steam side is exhausted from the main turbine 10 and the small turbine 401. The operating mode includes the following control methods.
1) The mode of closing the second valve DF-02 and the third valve DF-03 and opening the first valve DF-01 can be adopted, so that the exhaust steam of the main turbine 10 is independently born by the direct air-cooled radiator 50, and the exhaust steam of the small turbine 401 is independently born by the combined indirect cooling system. The two systems are relatively independent, and the adjustment is more flexible.
2) Or the first valve DF-01 and the third valve DF-03 can be closed, and the second valve DF-02 can be opened, so that the exhaust steam of the main turbine 10 and the small turbine 401 is born by the direct air-cooling radiator 50, and the combined indirect cooling system stops running.
3) Or the mode of closing the first valve DF-01 and opening the second valve DF-02 and the third valve DF-03 can be adopted, so that the exhaust steam of the main turbine 10 and the small turbine 401 is jointly born by the direct air cooling system and the compound indirect cooling system. Furthermore, when the temperature is lower in winter, the evaporative air cooler 602 in the combined indirect cooling system stops operating, and the direct air-cooling radiator 50, the finned tube air cooler 601 and the condenser 60 are operated to take on the cooling task.
The invention combines the combination form of the machine side and the cold end system from the actual engineering to realize the multi-working condition and the possibility of multi-scheme measures, the rigidity adjustment is softer, the requirements of the future machine set development are more met, and the aims of saving energy, reducing construction and improving efficiency are fulfilled. Meanwhile, the scheme provides abundant and feasible control operation modes, and provides more choices for flexible operation, energy conservation and construction reduction of the unit.
Claims (6)
1. An air cooling coupling operation system arrangement of a steam-electric double-drive water feeding pump in a thermal power plant comprises a main steam turbine (10) and a water feeding pump (40), and is characterized in that the water feeding pump (40) is driven by steam and electricity and is connected with a small steam turbine (401) and a motor (402);
the main steam turbine (10) is sequentially connected with a steam exhaust device (30) and a direct air cooling system through a first main exhaust steam pipeline; a first branch pipeline is additionally arranged on a first dead steam main pipeline between the steam exhaust device (30) and the direct air cooling system and connected with the compound indirect cooling system, and a third valve DF-03 is arranged on the first branch pipeline;
the small steam turbine (401) is connected with the steam exhaust device (30) through a second main exhaust steam pipeline; a second valve DF-02 is arranged on the second main exhaust steam pipeline and is used for opening and closing the exhaust steam communication between the second main exhaust steam pipeline and the steam exhaust device (30);
the second main dead steam pipeline is additionally provided with a second branch pipeline connected with the combined indirect cooling system; and a first valve DF-01 is arranged on the second branch pipeline and used for opening and closing the circulation of the second branch pipeline, and the inflow end of the second branch pipeline is positioned at the upstream of the second valve DF-02.
2. The air-cooling coupled operation system arrangement of the electrified double-drive feed pump of the thermal power plant as claimed in claim 1, wherein the combined indirect cooling system comprises a condenser (60), one end of the condenser (60) is provided with a circulation pipeline, and the circulation pipeline is sequentially provided with a circulation water pump, a finned tube air cooler (601) and an evaporative air cooler (602).
3. An air-cooling coupled operation system arrangement of a charged steam and electricity double-drive feed water pump of a thermal power plant as claimed in claim 1, characterized in that the feed water pump (40), the small steam turbine (401) and the electric motor (402) are connected in series, and the small steam turbine (401) and the electric motor (402) are arranged on the same side.
4. An air-cooling coupled operation system arrangement of a charged steam dual-drive feed pump of a thermal power plant as set forth in claim 1, wherein an outflow end of said second branch conduit communicates with said first branch conduit to form a junction (70), and said third valve DF-03 is disposed upstream of said junction (70).
5. The air-cooling coupled operation system arrangement of the electrified double-drive feed water pump of the thermal power plant as claimed in claim 1, wherein the direct air-cooling system is a direct air-cooling radiator (50).
6. A control method of an air-cooling coupling operation system of a steam-electric double-drive feed water pump of a thermal power plant is characterized by comprising the air-cooling coupling operation system arrangement according to any one of claims 1 to 5, wherein the control method of the air-cooling coupling operation system arrangement according to different working conditions comprises the following steps:
the working condition I is as follows: in summer, the working condition of an electric pump is adopted; the feed pump (40) is driven by the motor (402), the first valve DF-01 and the second valve DF-02 are closed at the moment, the third valve DF-03 is opened, and dead steam discharged by the main steam turbine (10) is respectively born by the direct air cooling system and the compound indirect cooling system;
working conditions are as follows: adopting a steam pump working condition in summer; the water feeding pump (40) is driven by the small turbine (401), the first valve DF-01 is closed at the moment, the second valve DF-02 and the third valve DF-03 are opened, and the exhaust steam of the main turbine (10) and the small turbine (401) is shared by a direct air cooling system and a compound indirect cooling system;
working conditions are as follows: the working condition of a steam pump is adopted in cold seasons; in the working condition, a feed water pump (40) is driven by a small steam turbine (401) to operate, and steam exhaust at a steam side is a main steam turbine (10) and the small steam turbine (401); the control method of the working condition comprises the following steps:
1) closing a second valve DF-02 and a third valve DF-03, and opening a first valve DF-01 to ensure that the exhaust steam of the main turbine (10) is independently born by a direct air cooling system and the exhaust steam of the small turbine (401) is independently born by a combined indirect cooling system; or,
2) closing a first valve DF-01 and a third valve DF-03, and opening a second valve DF-02 to ensure that the exhaust steam of the main turbine (10) and the small turbine (401) is only born by a direct air cooling system; or,
3) and closing the first valve DF-01, and opening the second valve DF-02 and the third valve DF-03 to ensure that the exhaust steam of the main turbine (10) and the small turbine (401) is jointly born by a direct air cooling system and a compound indirect cooling system.
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|---|---|---|---|
| CN202010837396.0A CN111879168B (en) | 2020-08-19 | 2020-08-19 | Air cooling coupling operation system arrangement with steam-electricity double-drive water supply pump for thermal power plant and control method of air cooling coupling operation system arrangement |
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| CN202010837396.0A CN111879168B (en) | 2020-08-19 | 2020-08-19 | Air cooling coupling operation system arrangement with steam-electricity double-drive water supply pump for thermal power plant and control method of air cooling coupling operation system arrangement |
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| CN113090539A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Air cooling unit primary frequency modulation electric water supply system based on double-fed system |
| CN113090542A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Steam-electricity double-drive water pump system of indirect air cooling unit based on double-feed system |
| CN113090544A (en) * | 2021-04-08 | 2021-07-09 | 西安热工研究院有限公司 | Direct air cooling unit vapour electricity double-drive feed pump system based on double-fed system |
| CN113586179A (en) * | 2021-08-31 | 2021-11-02 | 西安热工研究院有限公司 | System and method for reusing wind-water complementary cooling and steam pump steam exhaust cold source of direct air cooling unit |
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| CN113863999A (en) * | 2021-09-18 | 2021-12-31 | 西安热工研究院有限公司 | Cold source sharing system and method for dry-wet combined cooling and steam-electricity double-drive induced draft fan of direct air cooling unit |
| CN113863998A (en) * | 2021-09-18 | 2021-12-31 | 西安热工研究院有限公司 | Cold source sharing system and method for dry-wet combined cooling and fan power center of direct air cooling unit |
| CN114000927A (en) * | 2021-09-18 | 2022-02-01 | 杭州中能汽轮动力有限公司 | Waste heat heating control method for steam turbine generator unit and steam turbine generator unit |
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| CN114000927B (en) * | 2021-09-18 | 2023-08-22 | 杭州中能汽轮动力有限公司 | Waste heat heating control method of steam turbine generator unit and steam turbine generator unit |
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