CN111120013A - Reliable steam supply system under unavailable working condition of steam turbine generator unit - Google Patents
Reliable steam supply system under unavailable working condition of steam turbine generator unit Download PDFInfo
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- CN111120013A CN111120013A CN201911283925.0A CN201911283925A CN111120013A CN 111120013 A CN111120013 A CN 111120013A CN 201911283925 A CN201911283925 A CN 201911283925A CN 111120013 A CN111120013 A CN 111120013A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 177
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 230000001105 regulatory effect Effects 0.000 claims abstract description 41
- 238000003303 reheating Methods 0.000 claims abstract description 12
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 32
- 230000009467 reduction Effects 0.000 claims description 23
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 239000008400 supply water Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 230000002209 hydrophobic effect Effects 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- 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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
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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
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Control Of Turbines (AREA)
Abstract
The invention provides a reliable steam supply system under the condition that a steam turbine generator unit cannot work, which comprises a heat supply network condensed water return pipeline, wherein the heat supply network condensed water return pipeline is used for supplying water with high-pressure desalted water to a deaerator, heating and deaerating the water in the deaerator, then conveying the water to a boiler through a water supply pump and a high-pressure heater in sequence, heating the deaerated water at a constant pressure in the boiler to absorb heat and vaporize the water into saturated steam, continuously absorbing heat in a superheater to form superheated steam, allowing the superheated steam to enter a cold re-steam pipeline after passing through a high-pressure bypass pneumatic regulating valve, then heating the superheated steam in a boiler reheater, allowing the heated reheated steam to pass through a hot reheat steam pipeline to supply steam; the return water of the heat supply network is sent to a deaerator through a return water booster pump of the heat supply network; when the reliable steam supply system under the condition that the steam turbine generator unit is unavailable normally operates, the water source of the deaerator is returned water of a heat supply network; a heating steam supply pipeline is added on the hot reheating steam pipeline and passes through a temperature and pressure reducing and heat supplying network.
Description
Technical Field
The invention belongs to the field of a steam turbine generator unit, and particularly relates to a reliable steam supply system under the condition that the steam turbine generator unit cannot work.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The thermal power plant converts the chemical energy of the fuel into high-grade heat energy for generating electricity, and simultaneously uses the low-grade heat energy which has done work in the steam turbine for supplying heat to the outside, thereby achieving the purpose of 'using the heat to the full extent'. Along with the development of economy and society, the demand of urban construction and industrial production on heat energy is increasing, and urban central heating is rapidly developed. Once the steam turbine generator unit of the thermal power plant breaks down, the whole centralized heating system is paralyzed, great inconvenience is brought to enterprise production and people's life in a hot area, and meanwhile, great economic loss is caused to power generation enterprises.
The steam source for heating the heat supply network is generally extracted from the last stage of a medium pressure cylinder, the working process is that a condensate pump conveys condensed water of a heat well to a deaerator, the condensed water is conveyed to a boiler by a boiler feed pump after being deaerated and heated in the deaerator, the water is subjected to constant pressure heat absorption and vaporization in the boiler to form saturated steam, the saturated steam is continuously subjected to heat absorption in a superheater to form superheated steam, the superheated steam enters a high pressure cylinder of a steam turbine through a superheated steam pipeline to be subjected to adiabatic expansion to be used as the steam which is used for completing work and enters a reheater to be heated, the heated reheated steam enters a medium pressure cylinder of the steam turbine to be used as the work continuously, a part of the steam which is used for completing the work is discharged to a low pressure cylinder of the steam turbine to be used for continuously applying the work and. Meanwhile, the steam turbine applies work to drive the generator to convert mechanical energy into electric energy.
The inventor finds that when the steam turbine generator unit fails and cannot normally operate, a steam source for heating cannot be provided by exhausting air through the steam turbine, so that great influence is brought to urban heating and normal operation of an industrial park, and influence is brought to normal life of people; and meanwhile, the economic benefit of power generation enterprises is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a reliable steam supply system under the condition that a steam turbine generator unit is unavailable, which ensures the stable operation of a heating system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a reliable steam supply system under the unavailable operating mode of a steam turbine generator unit comprises:
the hot net condensed water return pipeline is used for conveying high-pressure desalted water to a deaerator, heating and deaerating the deaerator, and then conveying the deaerated water to a boiler through a water feeding pump and a high-pressure heater in sequence, the deaerated water is heated and evaporated to saturated steam at a constant pressure in the boiler, the saturated steam is continuously absorbed in a superheater to form superheated steam, the superheated steam enters a cold re-steam pipeline after passing through a high-pressure bypass pneumatic regulating valve and then enters a boiler reheater for heating, and the heated reheated steam enters a hot net steam supply main pipe after being supplied with steam, subjected to temperature reduction and pressure reduction through a hot re-heated steam pipeline; the return water of the heat supply network is sent to a deaerator through a return water booster pump of the heat supply network; when the reliable steam supply system under the condition that the steam turbine generator unit is unavailable normally operates, the water source of the deaerator is returned water of a heat supply network; a heating steam supply pipeline is added on the hot reheating steam pipeline and passes through a temperature and pressure reducing and heat supplying network.
As an implementation mode, a pneumatic check valve for supplying steam from hot reheat steam to a heat supply network, a hydraulic regulating valve for reducing the temperature and pressure of the hot reheat steam to the heat supply network and an electric isolating valve for supplying steam from the hot reheat steam to the heat supply network are sequentially connected in series on the heating steam supply pipeline.
As an implementation mode, the return water of the heat supply network also provides desuperheating water for heating steam supply through a heating steam supply return water pipeline; and the heating steam supply water return pipeline is sequentially provided with a heat supply network water return to heat supply network temperature reduction pressure reducer temperature reduction water electric isolation valve and a heat supply network water return to heat supply network temperature reduction pressure reducer temperature reduction water pneumatic regulating valve.
In one embodiment, a steam discharge line is added to the hot reheat steam line to prevent overpressure in the hot reheat steam line.
In one embodiment, the steam discharge pipeline is communicated with the atmosphere, and a hot reheat steam exhaust-to-atmosphere electric isolation valve and a hot reheat steam exhaust-to-atmosphere pneumatic adjusting valve are arranged on the steam discharge pipeline.
As an embodiment, reliable steam supply system under the unavailable operating mode of turbo generator set still includes the external hydrophobic flash tank system of condenser, the external hydrophobic flash tank system of condenser includes external hydrophobic flash tank, external hydrophobic flash tank links to each other respectively with drain pipe and drainage pipe, drain pipe is used for receiving system drainage and conveys to external hydrophobic flash tank, and external hydrophobic flash tank output is linked together with condenser and unit water drainage tank, guarantees that turbo generator set is unavailable when, and turbo generator set's drainage system can normal operating.
As an implementation mode, a heat supply network water return pipeline is additionally arranged on the heat supply network condensed water return pipeline, the heat supply network condensed water return pipeline is connected with the heat supply network water return pipeline in parallel, the heat supply network water return pipeline is used for conveying heat supply network return water to a deaerator pipeline, therefore, when a turbo generator set and a condenser are unavailable, the deaerator is guaranteed to supply water reliably, and hot reheat steam is delivered to heating steam supply desuperheating water.
In one embodiment, the superheater is further connected with the reheater through a high-pressure cylinder, and a pipeline communicated between the superheater and the high-pressure cylinder is further provided with superheated steam to a high-pressure cylinder electric isolation valve to isolate the superheated steam from entering the steam turbine.
In one embodiment, the hot reheat steam pipeline is provided with an intermediate pressure cylinder, and an electric isolation valve for isolating hot reheat steam from the intermediate pressure cylinder is arranged between the intermediate pressure cylinder and the reheater, so as to isolate the hot reheat steam from entering the steam turbine.
As an implementation mode, a heating steam source of a deaerator is sent to an auxiliary steam header, the input end of the auxiliary steam header is connected with an auxiliary steam supply system pipeline and a hot reheating steam pipeline through a reheating cold section, the input end of the auxiliary steam header is also connected with an auxiliary steam supply pipeline of a machine or a starting furnace, and the output end of the auxiliary steam header is respectively connected with a deaerator heating pipeline and an auxiliary steam supply boiler user air supply pipeline; a cold-to-auxiliary steam supply electric isolation valve and a cold-to-auxiliary steam supply electric regulating valve are arranged on the pipeline of the reheating cold section auxiliary steam supply system; when the unit is in a normal operation stage, the auxiliary steam source is cooled to the auxiliary steam supply electric isolating valve and cooled to the auxiliary steam supply electric regulating valve to assist the steam header to supply steam.
The invention has the beneficial effects that:
(1) when the steam turbine generator unit fails and cannot normally operate and needs to be shut down for maintenance, a gas source for heating cannot be provided, the invention provides a reliable steam supply system under the condition that the steam turbine generator unit cannot be used, the stable operation of a heating system is ensured, and the influence on enterprise production and people life in a hot area is reduced; meanwhile, precious time is provided for the overhaul work of the unit, and the economic benefit of a power generation enterprise is guaranteed.
(2) The hot reheating steam pipeline is additionally provided with a heating steam supply pipeline, and the stability of a heating steam source is ensured through a heating network after temperature and pressure reduction.
(3) According to the invention, a steam discharge pipeline is added in the hot reheat steam pipeline, so that overpressure of the reheater pipeline is prevented.
(4) The invention adds a set of external drainage flash tank system of the condenser, and ensures that the drainage system of the turbine generator set can normally operate when the turbine generator set is unavailable.
(5) According to the invention, one path of backwater is added to the deaerator pipeline in the heat supply network condensed water backwater system, so that the deaerator can supply water reliably when a turbo generator set and a condenser are unavailable, and hot reheat steam is heated to heating steam supply desuperheating water.
(6) According to the invention, an electric isolation valve is added before the superheated steam enters the high-pressure cylinder, and an electric isolation valve is added before the hot reheat steam enters the intermediate-pressure cylinder, so that the superheated steam and the hot reheat steam are isolated from entering the steam turbine.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a reliable steam supply system in a condition that a steam turbine generator unit is unavailable according to an embodiment of the present invention.
Wherein, 1, an electric isolating valve for supplying water to a high-side desuperheating water; 2. a pneumatic regulating valve for supplying water to a high-side desuperheating water; 3. a high pressure bypass pneumatic regulator valve; 4. superheated steam to a high pressure cylinder electric isolation valve; 5. a high pressure cylinder; 6. a high pressure cylinder exhaust check valve; 7. hot reheat steam to intermediate pressure cylinder electric isolation valves; 8. an intermediate pressure cylinder; 9. pumping air from the intermediate pressure cylinder to a pneumatic check valve of a heat supply network; 10. the intermediate pressure cylinder pumps air to the hydraulic regulating valve of the heat supply network; 11. the intermediate pressure cylinder exhausts air to the electric isolating valve of the heat supply network; 12. hot reheat steam to a heat supply network steam supply pneumatic check valve; 13. the hot reheat steam is sent to a hydraulic control valve of a temperature and pressure reducing device of a heat supply network; 14. the hot reheat steam is supplied to a heat supply network for steam supply and an electric isolation valve; 15. the heat supply network returns water to heat and supplies the water to the pneumatic regulating valve of the temperature-reducing water of the temperature-reducing pressure reducer of the heat supply network; 16. the heat supply network returns water to heat and then supplies the electric isolation valve for the temperature-reducing water of the temperature-reducing pressure reducer of the heat supply network; 17. the middle pressure cylinder exhausts to the low pressure cylinder hydraulic butterfly valve; 18. a low pressure bypass pneumatic regulator valve; 19. the condensed water enters a low-pressure bypass temperature-reducing water pneumatic regulating valve; 20. the condensed water enters a low-pressure bypass temperature-reducing water electric isolation valve; 21. a low pressure cylinder; 22. a condenser; 23. a condensate pump; 24. fine processing; 25. a low pressure heater; 26. the condensed water is sent to a water feeding check valve of a deaerator; 27. a deaerator; 28. a feed pump; 29. a high pressure heater; 30. a boiler; 31. cooling the steam to an auxiliary steam supply electric isolating valve; 32. cooling and then supplying the air to an auxiliary steam supply pneumatic regulating valve; 33. an external drainage flash tank; 34. the desalted water is conveyed to a drain flash tank arranged outside the condenser to reduce the temperature of the water and the pneumatic regulating valve; 35. the desalted water is sent to a drain flash tank arranged outside the condenser to reduce the temperature of the water and gas electric power supply valve; 36. a drain pump of an external drain flash tank; 37. the drain pump is connected with a pneumatic regulating valve for pressure water drainage of the unit; 38. a drain pump to a condenser pneumatic control valve; 39. a bypass electric valve of a return water booster pump of the heat supply network; 40. a return water booster pump of the heat supply network; 41. a heat supply network water return and supplement check valve; 42. the electric isolating valve is used for supplying water from high-pressure desalted water to a heat supply network; 43. a pneumatic regulating valve for supplying water from high-pressure desalted water to a heat supply network backwater; 44. returning water from the heat supply network to the electric isolation valve of the deaerator; 45. returning water from the heat supply network to a deaerator pneumatic regulating valve; 46. the heat supply network returns water to the electric isolating valve of the condenser; 47. returning water from the heat supply network to a pneumatic regulating valve of a condenser; 48. a generator; 49. the hot reheat steam is exhausted to an atmospheric electric isolation valve; 50. exhausting the hot reheat steam to an atmospheric pneumatic regulating valve; 51. and (4) high-pressure desalted water is delivered to a heat supply network water return and supplement check valve.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As shown in fig. 1, the reliable steam supply system of the steam turbine generator unit in the unavailable condition of the embodiment includes:
the heat supply network condensed water return pipeline is used for conveying high-pressure desalted water to the deaerator 27, heating and deaerating the deaerator 27, conveying the deaerator 27 to the boiler 30 through the water feed pump 28 and the high-pressure heater 29 in sequence, carrying out constant-pressure heat absorption and vaporization on the deaerated water in the boiler to obtain saturated steam, continuously absorbing heat in the superheater to form superheated steam, allowing the superheated steam to pass through the high-pressure bypass pneumatic regulating valve, then entering the cold reheat steam pipeline, then entering the boiler reheater for heating, allowing the reheated steam after heating to pass through the hot reheat steam pipeline for steam supply, temperature reduction and pressure reduction, and then entering the heat supply network steam supply main pipe; the return water of the heat supply network is sent to a deaerator through a return water booster pump 40 of the heat supply network; when the reliable steam supply system under the condition that the steam turbine generator unit is unavailable normally operates, the water source of the deaerator is returned water of a heat supply network; a heating steam supply pipeline is added on the hot reheating steam pipeline and passes through a temperature and pressure reducing and heat supplying network.
A heat supply network backwater water replenishing check valve 41 is also arranged on a pipeline communicated between the backwater booster pump 40 and the deaerator 27.
Wherein, a bypass electric valve 39 of the heat supply network backwater booster pump is also arranged on the parallel pipeline of the heat supply network backwater booster pump 40. And a pipeline communicated between the condenser in the return water pipeline of the heat supply network and the condenser in the return water pipeline of the condensed water of the heat supply network is connected with a heat supply network return water to condenser electric isolating valve 46 and a heat supply network return water to condenser pneumatic regulating valve 47.
In this embodiment, a high-pressure desalted water replenishing pipeline is additionally arranged on the heat supply network condensed water return pipeline, and the high-pressure desalted water replenishing pipeline is provided with a high-pressure desalted water to heat supply network return water replenishing electric isolating valve 42, a high-pressure desalted water to heat supply network return water pneumatic replenishing valve 43 and a high-pressure desalted water to heat supply network return water replenishing check valve 51. And water is conveyed to the deaerator by opening the high-pressure desalted water-to-heat-supply-network backwater water-supplementing electric isolating valve and the regulating valve at the starting stage of the unit.
Specifically, in the return pipeline of the condensed water of the heat supply network, the condensed water output by the condenser 22 is sequentially transmitted to the deaerator 27 through the condensed water pump 23, the fine treatment 24 and the low-pressure heater 25, and a pipeline connecting the low-pressure heater 25 and the deaerator 27 is further provided with a condensed water-to-deaerator water-feeding check valve 26.
As an embodiment, a pneumatic check valve 12 for supplying steam to the heat supply network by hot reheat steam, a hydraulic regulating valve 13 for reducing the temperature and pressure of the heat supply network by hot reheat steam and an electric isolation valve 14 for supplying steam to the heat supply network by hot reheat steam are sequentially connected in series on the heating steam supply pipeline.
As an implementation mode, the return water of the heat supply network also provides desuperheating water for heating steam supply through a heating steam supply return water pipeline; and a heating steam supply water return pipeline is sequentially provided with a heat supply network water return-to-heat resupply heat supply network temperature reduction pressure reducer temperature reduction water electric isolation valve 16 and a heat supply network water return-to-heat resupply heat supply network temperature reduction pressure reducer temperature reduction water pneumatic regulating valve 15.
In one embodiment, a steam discharge line is added to the hot reheat steam line to prevent overpressure in the hot reheat steam line.
In one embodiment, the steam discharge pipeline is communicated with the atmosphere, and a hot reheat steam exhaust-to-atmosphere electric isolation valve 49 and a hot reheat steam exhaust-to-atmosphere pneumatic adjusting valve 50 are arranged on the steam discharge pipeline.
Specifically, hot reheat steam entering a boiler reheater for heating enters a hot reheat steam pipeline, the hot reheat steam pipeline is divided into four paths, one path is connected to a heat supply network steam supply main pipe through a temperature and pressure reducing device, the other path enters a condenser through a low-pressure bypass valve, the other path enters a steam turbine intermediate pressure cylinder for acting, and the other path is exhausted to the atmosphere through the superheated reheat steam and then is exhausted to the atmosphere air regulating valve to be exhausted to the atmosphere.
Specifically, hot reheat steam to intermediate cylinder electric isolation valve 7 closes isolation intermediate cylinder 8. The low pressure bypass pneumatic regulator valve 18 keeps the isolation condenser 22 closed. Wherein, a hydraulic butterfly valve 17 for exhausting the air from the intermediate pressure cylinder to the low pressure cylinder is arranged on a pipeline for connecting the intermediate pressure cylinder 8 and the low pressure cylinder 21; the condenser 22 is connected with a condensed water pipeline, the condensed water pipeline is used for receiving condensed water, and a condensed water to low-pressure bypass temperature-reducing water pneumatic regulating valve 19 and a condensed water to low-pressure bypass temperature-reducing water electric isolating valve 20 are arranged on the condensed water to low-pressure bypass pneumatic regulating valve 18 temperature-reducing water pipeline.
And opening the intermediate pressure cylinder to pump air to the heat supply network pneumatic check valve 9, the intermediate pressure cylinder to pump air to the heat supply network hydraulic control valve 10 and the intermediate pressure cylinder to pump air to the heat supply network electric isolation valve 11, and simultaneously opening the heat supply network return water to heat supply network temperature reduction pressure reducer temperature reduction water pneumatic control valve 15 and the heat supply network return water to heat supply network temperature reduction pressure reducer temperature reduction water electric isolation valve 16 to provide a steam source with required pressure and temperature for the heat supply network. The exhaust of hot reheat steam to the atmospheric electric isolation valve 49 is opened, the exhaust of hot reheat steam to the atmospheric pneumatic regulating valve 50 is automatically started, and when a certain design value is reached, the valve is automatically opened to prevent the overpressure of a reheater.
As an embodiment, reliable steam supply system under the unavailable operating mode of turbo generator set still includes the external hydrophobic flash tank system of condenser, the external hydrophobic flash tank system of condenser includes external hydrophobic flash tank 33, external hydrophobic flash tank 33 links to each other respectively with drain pipe and drainage pipe, drain pipe is used for receiving system drainage and conveys to external hydrophobic flash tank, and external hydrophobic flash tank output is linked together with condenser and unit water drainage tank, guarantees that turbo generator set is unavailable when turbo generator set's drainage system can normal operating.
A pneumatic regulating valve 34 for reducing the temperature of the desalted water to the external drainage flash tank of the condenser and a pneumatic power supply valve 35 for reducing the temperature of the desalted water to the external drainage flash tank of the condenser are arranged on the drainage pipeline; the drainage in the external drainage flash tank 33 is conveyed to a condenser and a unit drainage tank through an external drainage flash tank drainage pump 36; and when the condenser is available, the water is conveyed to the condenser, and when the condenser is unavailable, the water is conveyed to a unit drainage tank at a starting stage. A drain pump-to-unit pressure drain pneumatic regulating valve 37 is arranged on the drainage pipeline, and a drain pump-to-condenser pneumatic regulating valve 38 is arranged on the heat supply network condensed water return pipeline.
As an implementation mode, a heat supply network water return pipeline is added on the heat supply network condensed water return pipeline, so that the heat supply network condensed water return pipeline and the heat supply network water return pipeline are connected in parallel, the heat supply network water return pipeline is used for conveying heat supply network return water to a deaerator pipeline, therefore, when the turbo-generator 48 and the condenser 22 are not available, reliable water supply of the deaerator is ensured, and temperature reducing water is provided for heating and steam supply of hot reheat steam.
Wherein, a heat supply network backwater to deaerator electric isolating valve 44 and a heat supply network backwater to deaerator pneumatic regulating valve 45 are arranged on the heat supply network backwater pipeline;
in this embodiment, return water to the oxygen-eliminating device pipeline all the way, including heat supply network return water booster pump, heat supply network return water to the electronic isolating valve of oxygen-eliminating device and pneumatic governing valve. When the heating system normally operates, the return water of the heat supply network is conveyed to the deaerator through the return water booster pump of the heat supply network.
In one embodiment, the superheater is further connected with the reheater through a high-pressure cylinder 5, and a pipeline communicated between the superheater and the high-pressure cylinder 5 is further provided with superheated steam to a high-pressure cylinder electric isolation valve 4 to isolate the superheated steam from entering the high-pressure cylinder 5. And a high-pressure cylinder exhaust check valve 6 is also arranged on a pipeline connecting the high-pressure cylinder 5 and the reheater.
Specifically, the heated and deoxygenated feed water passes through a high-pressure heater by a feed water pump and then is conveyed to a boiler for constant-pressure heat absorption. Superheated steam which is continuously absorbed and formed in the superheater passes through a hot steam pipeline, and a superheated steam electric isolating door is additionally arranged before the superheated steam enters the high-pressure cylinder to isolate the high-pressure cylinder of the steam turbine. The superheated steam passes through a high-pressure bypass pneumatic regulating valve 3, a water supply high-side temperature-reducing water electric isolating valve 1 and a water supply high-side temperature-reducing water pneumatic regulating valve 2 to automatically control the superheated steam pressure and temperature to a designed value. The superheated steam enters the cold reheat steam pipeline after passing through the high-pressure bypass pneumatic control valve 3.
In one embodiment, the hot reheat steam pipeline is provided with an intermediate pressure cylinder 8, and a hot reheat steam to intermediate pressure cylinder electric isolation valve 7 is arranged between the intermediate pressure cylinder 8 and the reheater to isolate the hot reheat steam from entering the steam turbine.
In this embodiment, the deaerator interface includes condensate to deaerator moisturizing pipeline, heat supply network return water and high pressure demineralized water moisturizing pipeline, the water feed pump entry. The heating steam source of the deaerator is sent to an auxiliary steam header, the input end of the auxiliary steam header is connected with a hot reheating steam pipeline through a reheating cold section auxiliary steam supply system pipeline, the input end of the auxiliary steam header is also connected with a machine-in or starting furnace auxiliary steam supply pipeline, and the output end of the auxiliary steam header is respectively connected with a deaerator heating pipeline and an auxiliary steam boiler user air supply pipeline; a cold-to-auxiliary steam supply electric isolation valve 31 and a cold-to-auxiliary steam supply electric regulating valve 32 are arranged on a pipeline of the reheating cold section auxiliary steam supply system; when the unit is in a normal operation stage, the auxiliary steam source is cooled to the auxiliary steam supply electric isolating valve and cooled to the auxiliary steam supply electric regulating valve to assist the steam header to supply steam.
At the initial starting stage of the unit, the drainage of systems such as a superheated steam pipeline, a hot reheat steam pipeline, a cold reheat steam pipeline, an auxiliary steam system, a heat supply network steam supply pipeline and the like is drained to a drainage flash tank arranged outside a condenser. The hydrophobic flash tank desuperheating water is from demineralized water. When the condenser is unavailable, the drain is conveyed to the unit water discharge tank through the pneumatic pressure water discharge regulating valve of the unit from the drain pump to the unit through the drain pump. When the condenser is available, the drain pump conveys the drain to the condenser pneumatic regulating valve through the drain pump.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a reliable steam supply system under turbo generator set unavailable operating mode which characterized in that includes:
the hot net condensed water return pipeline is used for conveying high-pressure desalted water to a deaerator, heating and deaerating the deaerator, and then conveying the deaerated water to a boiler through a water feeding pump and a high-pressure heater in sequence, the deaerated water is heated and evaporated to saturated steam at a constant pressure in the boiler, the saturated steam is continuously absorbed in a superheater to form superheated steam, the superheated steam enters a cold re-steam pipeline after passing through a high-pressure bypass pneumatic regulating valve and then enters a boiler reheater for heating, and the heated reheated steam enters a hot net steam supply main pipe after being supplied with steam, subjected to temperature reduction and pressure reduction through a hot re-heated steam pipeline; the return water of the heat supply network is sent to a deaerator through a return water booster pump of the heat supply network; when the reliable steam supply system under the condition that the steam turbine generator unit is unavailable normally operates, the water source of the deaerator is returned water of a heat supply network; a heating steam supply pipeline is added on the hot reheating steam pipeline and passes through a temperature and pressure reducing and heat supplying network.
2. The reliable steam supply system of claim 1 under the unavailable condition of the steam turbine generator unit, wherein a pneumatic check valve for supplying steam from hot reheat steam to a heat supply network, a hydraulic regulating valve for reducing the temperature and pressure of hot reheat steam to the heat supply network and an electric isolating valve for supplying steam from hot reheat steam to the heat supply network are connected in series on the heating steam supply pipeline in sequence.
3. The reliable steam supply system under the condition that the steam turbine generator unit cannot work according to claim 2, wherein the return water of the heat supply network also provides temperature-reducing water for heating steam supply through a heating steam supply return water pipeline; and the heating steam supply water return pipeline is sequentially provided with a heat supply network water return to heat supply network temperature reduction pressure reducer temperature reduction water electric isolation valve and a heat supply network water return to heat supply network temperature reduction pressure reducer temperature reduction water pneumatic regulating valve.
4. The steam turbine generator unit reliable steam supply system under unavailable conditions of claim 1, wherein a steam discharge pipeline is added to the hot reheat steam pipeline to prevent overpressure in the hot reheat steam pipeline.
5. The reliable steam supply system under the condition that the steam turbine generator unit is unavailable according to claim 1, wherein the steam discharge pipeline is communicated with the atmosphere, and a hot reheat steam exhaust-to-atmosphere electric isolation valve and a hot reheat steam exhaust-to-atmosphere pneumatic adjusting valve are arranged on the steam discharge pipeline.
6. The system of claim 1, further comprising an external drain flash tank system of the condenser, wherein the external drain flash tank system of the condenser comprises an external drain flash tank, the external drain flash tank system of the condenser is connected to a drain pipeline and a drain pipeline respectively, the drain pipeline is used for receiving drain water of the system and transmitting the drain water to the external drain flash tank, and an output end of the external drain flash tank is connected to the condenser and a unit drain tank, so that the drain system of the turbo generator set can operate normally when the turbo generator set is unavailable.
7. The system of claim 1, wherein a return line of the heat supply network is added to the return line of the condensed water of the heat supply network, such that the return line of the condensed water of the heat supply network is connected in parallel with the return line of the heat supply network, and the return water of the heat supply network is delivered to the deaerator line by using the return line of the heat supply network, thereby ensuring reliable water supply to the deaerator when the turbo generator unit and the condenser are not available, and providing temperature-reduced water for the hot reheat steam to the heating steam supply.
8. The system of claim 1, wherein the superheater is further connected to the reheater via a high pressure cylinder, and a pipeline connecting the superheater and the high pressure cylinder is provided with an electric isolation valve for isolating superheated steam from the turbine.
9. The steam turbine generator unit reliable steam supply system under the unavailable working condition as claimed in claim 1, wherein the hot reheat steam pipeline is provided with an intermediate pressure cylinder, an electric isolation valve of the hot reheat steam to the intermediate pressure cylinder is arranged between the intermediate pressure cylinder and the reheater, and the isolation hot reheat steam enters the steam turbine.
10. The reliable steam supply system under the condition of unavailable steam for the steam turbine generator unit as claimed in claim 1, wherein a heating steam source of the deaerator is supplied to an auxiliary steam header, the input end of the auxiliary steam header is connected with a hot reheat steam pipeline through a reheat cooling section auxiliary steam supply system pipeline, the input end of the auxiliary steam header is further connected with an auxiliary steam supply pipeline of a temporary machine or a starting furnace, and the output end of the auxiliary steam header is respectively connected with a heating pipeline of the deaerator and an auxiliary steam supply boiler user air supply pipeline; a cold-to-auxiliary steam supply electric isolation valve and a cold-to-auxiliary steam supply electric regulating valve are arranged on the pipeline of the reheating cold section auxiliary steam supply system; when the unit is in a normal operation stage, the auxiliary steam source is cooled to the auxiliary steam supply electric isolating valve and cooled to the auxiliary steam supply electric regulating valve to assist the steam header to supply steam.
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| CN112303611A (en) * | 2020-10-30 | 2021-02-02 | 西安热工研究院有限公司 | Direct current furnace high energy water recovery system |
| CN113587175A (en) * | 2021-06-08 | 2021-11-02 | 华能国际电力江苏能源开发有限公司南通电厂 | Heat supply system and heat supply method under unit deep peak regulation state |
| CN113586176A (en) * | 2021-08-27 | 2021-11-02 | 西安热工研究院有限公司 | System for switching cylinders of intermediate pressure cylinder of steam turbine of thermal power plant and operation method |
| CN113606001A (en) * | 2021-07-29 | 2021-11-05 | 中国能源建设集团华东电力试验研究院有限公司 | 600MW supercritical unit bypass system and bypass temperature control method thereof |
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| CN112303611A (en) * | 2020-10-30 | 2021-02-02 | 西安热工研究院有限公司 | Direct current furnace high energy water recovery system |
| CN113587175A (en) * | 2021-06-08 | 2021-11-02 | 华能国际电力江苏能源开发有限公司南通电厂 | Heat supply system and heat supply method under unit deep peak regulation state |
| CN113587175B (en) * | 2021-06-08 | 2023-09-29 | 华能国际电力江苏能源开发有限公司南通电厂 | Heat supply system and heat supply method in deep peak regulation state of unit |
| CN113606001A (en) * | 2021-07-29 | 2021-11-05 | 中国能源建设集团华东电力试验研究院有限公司 | 600MW supercritical unit bypass system and bypass temperature control method thereof |
| CN113586176A (en) * | 2021-08-27 | 2021-11-02 | 西安热工研究院有限公司 | System for switching cylinders of intermediate pressure cylinder of steam turbine of thermal power plant and operation method |
| CN114151145A (en) * | 2021-11-29 | 2022-03-08 | 山东钢铁集团日照有限公司 | Method and system for enabling steam generator and emergency condenser to synchronously operate |
| CN114151145B (en) * | 2021-11-29 | 2023-11-24 | 山东钢铁集团日照有限公司 | Method and system for enabling steam generator and accident condenser to synchronously operate |
| CN113958940A (en) * | 2021-11-30 | 2022-01-21 | 西安热工研究院有限公司 | Maintenance system and method for high-energy water recovery of supercritical unit |
| CN113958940B (en) * | 2021-11-30 | 2024-01-23 | 西安热工研究院有限公司 | Maintenance system and method for high-energy water recovery of supercritical unit |
| CN114941552A (en) * | 2022-05-13 | 2022-08-26 | 华电电力科学研究院有限公司 | Shutdown non-shutdown heat supply rapid switching control method based on large supercritical reheating type double-extraction back pressure unit |
| CN114941552B (en) * | 2022-05-13 | 2023-05-23 | 华电电力科学研究院有限公司 | Large supercritical reheating type double-pumping back pressure unit-based rapid switching control method for heat supply without stopping furnace when shutdown |
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