CN111780195B - Supercritical unit improved heat supply network drainage system and working method thereof - Google Patents
Supercritical unit improved heat supply network drainage system and working method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 275
- 239000000498 cooling water Substances 0.000 claims abstract description 86
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 53
- 238000010521 absorption reaction Methods 0.000 claims abstract description 52
- 239000002918 waste heat Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims description 71
- 238000001816 cooling Methods 0.000 claims description 23
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 239000013589 supplement Substances 0.000 claims description 22
- 239000008236 heating water Substances 0.000 claims description 16
- 230000001172 regenerating effect Effects 0.000 claims description 7
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000605 extraction Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 4
- 238000009833 condensation Methods 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract description 2
- 238000005498 polishing Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 239000012535 impurity Substances 0.000 description 4
- 239000003657 drainage water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000006244 Medium Thermal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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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
- F24D1/00—Steam central heating systems
- F24D1/02—Steam central heating systems operating with live steam
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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
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
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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
- F24D1/00—Steam central heating systems
- F24D1/08—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
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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
- F24D11/00—Central heating systems using heat accumulated in storage masses
- F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
- F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
- F24D11/0235—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy
- F24D11/025—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy contained in waste 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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses an improved heat supply network drainage system of a supercritical unit and a working method thereof, belonging to the technical field of cogeneration. At present, a system which is reasonable in design, can effectively reduce the temperature of the hydrophobic water of a heat supply network and protect a condensate fine treatment device when a supercritical unit cuts off a low-pressure cylinder does not exist. The system comprises a heat supply network heater, a heat supply network drainage main pipe, a drainage heat exchanger, a heat well, a condensate pump, a condensate fine treatment device and an absorption heat pump, wherein a drainage outlet of the heat supply network heater is connected with a drainage inlet of the drainage heat exchanger through the heat supply network drainage main pipe, a waste heat water outlet of the absorption heat pump is connected with a cooling water inlet of the drainage heat exchanger, a drainage outlet of the drainage heat exchanger is connected with an inlet of the heat well, an outlet of the heat well is connected with an inlet of the condensate pump, and an outlet of the condensate pump is connected with an inlet of the condensate fine treatment device. The system is high in energy utilization efficiency, and can well solve the problem that the temperature of the heat supply network hydrophobic water is too high after the supercritical unit is subjected to novel condensation extraction back transformation.
Description
Technical Field
The invention relates to an improved heat supply network drainage system of a supercritical unit, which is a system capable of reasonably optimizing a heat supply network drainage process and protecting a condensate fine treatment device and belongs to the technical field of cogeneration.
Background
Compared with the traditional subcritical unit, the supercritical thermal power generating unit has higher thermal efficiency, thereby having remarkable energy-saving and environmental-protection significance, and the large and medium thermal power generating units newly built in China are basically of the type. The supercritical unit has no steam pocket, the feed water is continuously finished from heating and evaporation to superheated steam at one time, and the functions of timing pollution discharge and continuous pollution discharge owned by a steam pocket boiler are lacked, so the requirement on the quality of the feed water is strict, and a condensate fine treatment device is usually arranged behind a condensate pump in a system. The condensate fine treatment device is mainly used for effectively treating impurities of condensate, such as metal corrosion products, water supplementing impurities, impurities leaked by a condenser and the like, but the device requires that the inlet water temperature is below 50-60 ℃, and the filter element is damaged due to overhigh temperature, so that the service life of equipment is influenced.
The novel condensing and back-drawing technology is a combined heat and power generation transformation technology, a steam turbine low-pressure cylinder can be safely operated at extremely low flow through the transformed unit, more steam extraction amount can be provided for the traditional heating steam extraction technology, and meanwhile, the steam turbine steam exhaust amount is greatly reduced, so that the condensate water directly discharged into a hot well is greatly reduced. For a supercritical unit, if the drainage of the heat supply network directly goes to a deaerator, impurities mixed in the drainage of the heat supply network cannot be removed; if the drainage of the heat supply network goes to the hot well and is mixed with a small amount of condensed water in the hot well, the mixed condensed water has the danger of overtemperature and is not beneficial to the operation of the condensed water fine treatment device.
The first type of heat pump is also called as a heat-increasing type heat pump, and is an absorption heat pump which can use a high-temperature driving heat source and low-temperature waste heat to produce medium-quality heat, can recover the waste heat to be effectively utilized, and the supplied hot water is widely used in the civil heating industry.
At present, a system which has reasonable structural design and convenient use, can effectively reduce the temperature of the hydrophobic water of a heat supply network and protect a condensate fine treatment device when a supercritical unit cuts off a low-pressure cylinder does not exist.
Disclosure of Invention
The invention aims to integrate the prior art, recover the waste heat of heat supply network drainage, reduce the temperature of the heat supply network drainage, ensure the safe and reliable operation of a condensate fine treatment device and improve the economic benefit of a system, and provides an improved heat supply network drainage system of a supercritical unit. According to the invention, the heat pump is reasonably utilized to recover the drain waste heat of the heat supply network, so that the heat pollution to the environment is reduced, and the economic benefit of the system is improved; secondly, the drainage temperature of a heat supply network is effectively reduced by a two-stage cooling mode of a drainage heat exchanger and a hot well, and the condensate fine treatment device is protected; and a cooling water supply system under an accident working condition is designed, so that the system can be reliably operated. The invention has high energy utilization efficiency and good economic benefit, and can well solve the problem of overhigh temperature of the heat-dissipating water of the heat supply network after the novel condensation extraction back transformation of the supercritical unit.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a hydrophobic system of supercritical unit improved generation heat supply network, includes the heat supply network heater, its characterized in that: the heating system comprises a heating steam main pipe, a heating network drainage main pipe, a drainage heat exchanger, a heat well, a condensate pump, a condensate fine treatment device, a condensate pipeline, a heating network return water main pipe and a heating network water supply main pipe, wherein the heating steam main pipe is connected with a steam inlet of the heat network heater, a drainage outlet of the heat network heater is connected with a drainage inlet of the drainage heat exchanger through the heating network drainage main pipe, a drainage outlet of the drainage heat exchanger is connected with an inlet of the heat well, an outlet of the heat well is connected with an inlet of the condensate pump, an outlet of the condensate pump is connected with an inlet of the condensate fine treatment device, an outlet of the condensate fine treatment device is connected with the condensate pipeline, the heating network return water main pipe is connected with a water side inlet of the heat network heater, and a water side outlet of the heat network heater is connected with the heating network water supply main pipe.
Furthermore, the invention also comprises a heat pump steam regulating valve, an absorption heat pump, a heat pump water draining stop valve, a heat pump water heating valve and a heat pump waste heat water valve, wherein the inlet of the heat pump steam regulating valve is connected to the heating steam main pipe in a side-by-side mode, the outlet of the heat pump steam regulating valve is connected with the steam inlet of the absorption heat pump, the water draining outlet of the absorption heat pump is connected with the inlet of the heat pump water draining stop valve, the outlet of the heat pump water draining stop valve is connected to the heat network water draining main pipe in a side-by-side mode, the inlet of the heat pump water heating valve is connected to the heat network water returning main pipe in a side-by-side mode, the outlet of the heat pump water heating valve is connected with the water heating inlet of the absorption heat pump, the water heating outlet of the absorption heat pump is connected to the heat network water supplying main pipe in a side-by-side mode, the inlet of the heat pump waste heat water heating valve is connected to the heat network water returning main pipe in a side-by-side mode, and the outlet of the heat pump waste heat water heating valve is connected with the waste heat pump waste heat water inlet of the absorption heat pump, and a waste heat water outlet of the absorption heat pump is connected with a cooling water inlet of the hydrophobic heat exchanger, and a cooling water outlet of the hydrophobic heat exchanger is connected to a heat supply network water supply main pipe in a bypassing manner.
Furthermore, the emergency cooling water system also comprises a factory water replenishing tank, an emergency cooling water pump, an emergency cooling water valve and an emergency cooling water return pipeline, wherein an outlet of the factory water replenishing tank is connected with an inlet of the emergency cooling water pump, an outlet of the emergency cooling water pump is connected with an inlet of the emergency cooling water valve, an outlet of the emergency cooling water valve is connected with an emergency cooling water inlet of the hydrophobic heat exchanger, and an emergency cooling water outlet of the hydrophobic heat exchanger is connected with the emergency cooling water return pipeline.
Furthermore, the condensate polishing device is a condensate polishing device used by a supercritical unit.
A working method of an improved heat supply network drainage system of a supercritical unit is characterized by comprising the following steps: using the system described above, the operating steps are as follows:
1) at the initial stage of a heating season, because the requirement on external heat load is not high, the supercritical unit does not cut off a low-pressure cylinder to operate at the moment, heating steam directly enters a heat supply network heater to work, then drain water flows into a heat well through a drain heat exchanger, is mixed with condensed water from a cooling tower in the heat well to be cooled, is sent to a condensed water fine treatment device by a condensed water pump to be treated, then the condensed water is sent to a steam turbine heat recovery system through a condensed water pipeline to be continuously heated, and heat supply network return water enters the heat supply network heater from a heat supply network return water main pipe to absorb heat and is sent to a heat user through a heat supply network water main pipe; at the moment, the heat pump steam regulating valve, the heat pump drainage stop valve, the heat pump heating water valve, the heat pump residual heat water valve and the accident cooling water valve are all closed, and the absorption heat pump and the accident cooling water pump do not work;
2) in the deep cold period of the heating season, the external heat load demand is increased, the supercritical unit needs to cut off the low-pressure cylinder to operate, and the low-pressure cylinder has extremely low exhaust steam flow, so that only a very small amount of condensed water cooled by the cooling tower exists in the hot well; the heat pump steam regulating valve, the heat pump drainage stop valve, the heat pump heating water valve and the heat pump waste heat water valve are all opened, most of heating steam is sent to the heat supply network heater to work, condensed drainage water is sent to the heat supply network drainage main pipe, the other part of heating steam is sent to the absorption heat pump through the heat pump steam regulating valve to be used as a driving heat source, and the condensed heat pump drainage water is also converged into the heat supply network drainage main pipe through the heat pump drainage stop valve; most of the return water of the heat supply network enters a heat supply network heater from a return water main pipe of the heat supply network to absorb heat, and then is sent to a heat user through a water supply main pipe of the heat supply network, the other part of the return water of the heat supply network enters an absorption heat pump through a heat pump water heating valve to be heated, the heated circulating water is converged into the water supply main pipe of the heat supply network, the other part of the return water of the heat supply network enters the absorption heat pump through a heat pump residual heat water valve to be cooled, and the cooled cooling water is sent to a water drainage heat exchanger, the drain water of the heat supply network drain main pipe is sent into a drain heat exchanger for cooling, cooling water is converged into a heat supply network water supply main pipe after heat exchange, the drain water flows into a heat well after temperature reduction, mixing with a small amount of condensed water from the cooling tower in the hot well for cooling, sending the mixture to a condensed water fine treatment device by a condensed water pump for treatment, then the condensed water is sent to a turbine regenerative system through a condensed water pipeline to be heated continuously, at the moment, an accident cooling water valve is closed, and an accident cooling water pump does not work;
3) when an absorption heat pump breaks down in a deep cold period in a heating season, an accident cooling water valve is opened, low-temperature water supplement in a plant water supplement tank is sent to a hydrophobic heat exchanger through an accident cooling water pump to cool hydrophobic water, the water supplement after heat absorption returns to a plant water supplement system through an accident cooling water return pipeline, a heat pump steam regulating valve, a heat pump hydrophobic stop valve, a heat pump heating water valve and a heat pump waste heat water valve can be closed at the moment, the cooled hydrophobic water flows into a hot well, the condensed water is mixed with a small amount of condensed water from a cooling tower in the hot well to be cooled, and then the condensed water is sent to a condensed water fine treatment device by a condensed water pump to be treated, and then the condensed water is sent to a steam turbine heat recovery system through a condensed water pipeline to continue heating.
Furthermore, heating steam enters a heat supply network heater for heating, then drained water enters a drain heat exchanger through a drain main pipe of the heat supply network, flows into a hot well for heat dissipation, is sent to a condensate fine treatment device by a condensate pump for treatment, and is finally sent to a turbine regenerative system through a condensate pipeline to form a drain cooling channel of the heat supply network; heating steam enters an absorption heat pump to work, and then drain water is converged into a heat supply network drain main pipe through a heat pump drain stop valve to form a steam water delivery channel driven by the heat pump; the return water of the heat supply network enters a heat supply network heater to absorb heat and is then sent to a heat user through a heat supply network water supply main pipe to form a heat supply network circulating water channel; the return water of the heat supply network enters the absorption heat pump for heating through the heat pump water heating valve and then flows into the heat supply network water supply mother pipe to form a heat pump water heating channel; the return water of the heat supply network enters an absorption heat pump through a heat pump waste heat water valve to be cooled, the cooled cooling water flows into a hydrophobic heat exchanger to cool the hydrophobic water, and finally the cooled cooling water is converged into a heat supply network water supply main pipe to form a cooling water channel; and the water supplement is discharged from the plant water supplement tank, is sent into the water drainage heat exchanger to cool the water drainage after passing through the accident cooling water pump and the accident cooling water valve, and finally returns to a plant water supplement system to form an accident working condition cooling water channel.
Compared with the prior art, the invention has the following advantages and effects: (1) the heat pump is reasonably utilized to recover the drain waste heat of the heat supply network, so that the heat pollution to the environment is reduced, and the economic benefit of the system is improved; (2) the temperature of the hydrophobic heat exchanger and the hydrophobic well can be effectively reduced by a two-stage cooling mode, and the condensate fine treatment device is protected; (3) the hydrophobic temperature is lower than that of the traditional mode, and the water quality treatment effect can be improved; (4) a cooling water supply system under an accident condition is designed, so that the system can be ensured to operate reliably; (5) the structure design is reasonable, the conception is unique, the operation is stable, and the reliability is good; (6) the energy utilization efficiency is high, and economic benefits is good, can solve supercritical unit well and carry out novel congeal to take out the too high problem of heat supply network drainage temperature behind the back of the body transformation.
Drawings
Fig. 1 is a schematic structural diagram of a drainage system of an improved heat supply network of a supercritical unit in an embodiment of the invention.
In the figure: the system comprises a heat supply network heater 1, a heating steam main pipe 2, a heat supply network drainage main pipe 3, a drainage heat exchanger 4, a heat well 5, a condensate pump 6, a condensate fine treatment device 7, a condensate pipe 8, a heat supply network return water main pipe 9, a heat supply network water supply main pipe 10, a heat pump steam regulating valve 11, an absorption heat pump 12, a heat pump drainage stop valve 13, a heat pump heating water valve 14, a heat pump residual heat water valve 15, a plant water supplement tank 16, an accident cooling water pump 17, an accident cooling water valve 18 and an accident cooling water return pipe 19.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples
Referring to fig. 1, in this embodiment, an improved heat supply network drainage system of a supercritical unit includes a heat supply network heater 1, a heating steam main pipe 2, a heat supply network drainage main pipe 3, a drainage heat exchanger 4, a heat well 5, a condensate pump 6, a condensate polishing device 7, a condensate pipeline 8, a heat supply network return water main pipe 9, a heat supply network water supply main pipe 10, a heat pump steam regulating valve 11, an absorption heat pump 12, a heat pump drainage stop valve 13, a heat pump heating water valve 14, a heat pump residual heat water valve 15, a plant water supply tank 16, an accident cooling water pump 17, an accident cooling water valve 18, and an accident cooling water return pipeline 19, where the condensate polishing device 7 is a condensate polishing device used by the supercritical unit.
In this embodiment, the female pipe of heating steam 2 and the steam inlet of heat supply network heater 1 are connected, the hydrophobic export of heat supply network heater 1 passes through the hydrophobic female pipe of heat supply network 3 and the hydrophobic access connection of hydrophobic heat exchanger 4, the hydrophobic export of hydrophobic heat exchanger 4 and the access connection of hot-well 5, the export of hot-well 5 and the access connection of condensate pump 6, the export of condensate pump 6 and the access connection of condensate polishing device 7, the export of condensate polishing device 7 and condensate pipeline 8 are connected, the female pipe of heat supply network return water 9 and the water side access connection of heat supply network heater 1, the water side export of heat supply network heater 1 and the female pipe of heat supply network water 10 are connected.
In the embodiment, an inlet of a heat pump steam regulating valve 11 is connected to a heating steam main pipe 2 in a bypassing manner, an outlet of the heat pump steam regulating valve 11 is connected to a steam inlet of an absorption heat pump 12, a drain outlet of the absorption heat pump 12 is connected to an inlet of a heat pump drain stop valve 13, an outlet of the heat pump drain stop valve 13 is connected to a heat supply network drain main pipe 3 in a bypassing manner, an inlet of a heat pump heating water valve 14 is connected to a heat supply network return water main pipe 9 in a bypassing manner, an outlet of the heat pump heating water valve 14 is connected to a heating water inlet of the absorption heat pump 12, a heating water outlet of the absorption heat pump 12 is connected to a heat supply network water main pipe 10 in a bypassing manner, an inlet of a heat pump waste heat water valve 15 is connected to the heat supply network return water main pipe 9 in a bypassing manner, an outlet of the heat pump waste heat water valve 15 is connected to a waste heat water inlet of the absorption heat pump 12, a waste heat water outlet of the absorption heat pump 12 is connected to a cooling water inlet of a drain heat exchanger 4, and a cooling water outlet of the drain heat exchanger 4 is connected to the heat supply network return water main pipe 10 in a bypassing manner.
In this embodiment, the outlet of the service water replenishing tank 16 is connected to the inlet of the emergency cooling water pump 17, the outlet of the emergency cooling water pump 17 is connected to the inlet of the emergency cooling water valve 18, the outlet of the emergency cooling water valve 18 is connected to the emergency cooling water inlet of the hydrophobic heat exchanger 4, and the emergency cooling water outlet of the hydrophobic heat exchanger 4 is connected to the emergency cooling water return pipe 19.
The improved heat supply network drainage system of the supercritical unit in the embodiment comprises the following channels: heating steam enters a heat supply network heater 1 for heating, then drained water enters a drain heat exchanger 4 through a heat supply network drain main pipe 3, then flows into a hot well 5 for heat dissipation, is sent to a condensate fine treatment device 7 by a condensate pump 6 for treatment, and finally is sent to a steam turbine heat return system through a condensate pipe 8 to form a heat supply network drain cooling channel; heating steam enters an absorption heat pump 12 to work, and then drained water is converged into a heat supply network drainage main pipe 3 through a heat pump drainage stop valve 13 to form a heat pump driving steam water delivery channel; the return water of the heat supply network enters a heat supply network heater 1 to absorb heat and then is sent to a heat user through a heat supply network water supply main pipe 10 to form a heat supply network circulating water channel; the return water of the heat supply network enters the absorption heat pump 12 for heating through the heat pump heating water valve 14 and then flows into the main water supply pipe 10 of the heat supply network to form a heat pump hot water adding channel; the return water of the heat supply network enters the absorption heat pump 12 through the heat pump waste heat water valve 15 to be cooled, the cooled cooling water flows into the hydrophobic heat exchanger 4 to cool the hydrophobic water, and finally flows into the main water supply pipe 10 of the heat supply network to form a cooling water channel; the water supplement is discharged from a plant water supplement tank 16, passes through an accident cooling water pump 17 and an accident cooling water valve 18, is sent into a hydrophobic heat exchanger 4 to cool the hydrophobic water, and finally returns to a plant water supplement system to form an accident working condition cooling water channel.
In this embodiment, the operation steps of the improved heat supply network drainage system of the supercritical unit are as follows:
1. at the initial stage of a heating season, because the requirement on external heat load is not high, the supercritical unit does not cut off a low-pressure cylinder to operate at the moment, heating steam directly enters a heat supply network heater 1 to work, then drained water flows into a heat well 5 through a drain heat exchanger 4, is mixed with condensed water from a cooling tower in the heat well 5 to be cooled, is sent to a condensed water fine treatment device 7 by a condensed water pump 6 to be treated, then the condensed water is sent to a turbine regenerative system through a condensed water pipeline 8 to be continuously heated, heat supply network backwater enters the heat supply network heater 1 from a heat supply network backwater main pipe 9 to absorb heat, and then is sent to a heat user through a heat supply network water supply main pipe 10; at the moment, the heat pump steam regulating valve 11, the heat pump drainage stop valve 13, the heat pump heating water valve 14, the heat pump waste heat water valve 15 and the accident cooling water valve 18 are all closed, and the absorption heat pump 12 and the accident cooling water pump 17 do not work;
2. in the deep cold period of the heating season, the external heat load demand is increased, the supercritical unit needs to cut off the low-pressure cylinder to operate, and the low-pressure cylinder has extremely low exhaust steam flow, so that only a very small amount of condensed water cooled by the cooling tower exists in the hot well 5; the heat pump steam regulating valve 11, the heat pump drainage stop valve 13, the heat pump heating water valve 14 and the heat pump waste heat water valve 15 are all opened, most of heating steam is sent to the heat supply network heater 1 to work, condensed drainage is sent to the heat supply network drainage main pipe 3, the other small part of heating steam is sent to the absorption heat pump 12 through the heat pump steam regulating valve 11 to be used as a driving heat source, and the condensed heat pump drainage is also converged into the heat supply network drainage main pipe 3 through the heat pump drainage stop valve 13; most of the return water of the heat supply network enters a heat supply network heater 1 from a heat supply network return water main pipe 9 to absorb heat, then the return water is sent to a heat user through a heat supply network water supply main pipe 10, another part of the return water of the heat supply network enters an absorption heat pump 12 through a heat pump heating water valve 14 to be heated, the heated circulating water is converged into the heat supply network water supply main pipe 10, another part of the return water of the heat supply network enters the absorption heat pump 12 through a heat pump waste heat water valve 15 to be cooled, the cooled cooling water is sent to a hydrophobic heat exchanger 4, the hydrophobic main pipe 3 of the heat supply network is sent to a hydrophobic heat exchanger 4 to be cooled, the cooling water is converged into the heat supply network water supply main pipe 10 after heat exchange, the cooled water flows into a heat well 5, is mixed with a small amount of condensed water from a cooling tower in the heat well 5 to be cooled, and then is sent to a condensed water fine processing device 7 by a condensed water pump, at this time, the emergency cooling water valve 18 is closed, and the emergency cooling water pump 17 does not work;
3. when the absorption heat pump 12 breaks down in a deep cold period in a heating season, the accident cooling water valve 18 is opened, low-temperature water supplement in the plant water supplement tank 16 is sent to the hydrophobic heat exchanger 4 through the accident cooling water pump 17 to cool and cool the hydrophobic water, the water supplement after heat absorption returns to a plant water supplement system through the accident cooling water return pipeline 19, at the moment, the heat pump steam regulating valve 11, the heat pump water drain stop valve 13, the heat pump water heating valve 14 and the heat pump residual heat water valve 15 can be closed, the cooled hydrophobic water flows into the hot well 5, the temperature of the cooled hydrophobic water is reduced by mixing with a small amount of condensed water from the cooling tower in the hot well 5, the condensed water is sent to the condensed water fine treatment device 7 by the condensed water pump 6 to be treated, and then the condensed water is sent to the turbine regenerative system through the condensed water pipeline 8 to be continuously heated.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (2)
1. A working method of an improved heat supply network drainage system of a supercritical unit comprises a heat supply network heater (1), and is characterized in that: the heating system further comprises a heating steam main pipe (2), a heat supply network drainage main pipe (3), a drainage heat exchanger (4), a heat well (5), a condensate pump (6), a condensate water fine treatment device (7), a condensate water pipeline (8), a heat supply network return water main pipe (9) and a heat supply network water supply main pipe (10), wherein the heating steam main pipe (2) is connected with a steam inlet of a heat supply network heater (1), a drainage outlet of the heat supply network heater (1) is connected with a drainage inlet of the drainage heat exchanger (4) through the heat supply network drainage main pipe (3), a drainage outlet of the drainage heat exchanger (4) is connected with an inlet of the heat well (5), an outlet of the heat well (5) is connected with an inlet of the condensate water pump (6), an outlet of the condensate water pump (6) is connected with an inlet of the condensate water fine treatment device (7), and an outlet of the condensate water fine treatment device (7) is connected with the condensate water pipeline (8), the heat supply network backwater main pipe (9) is connected with a water side inlet of the heat supply network heater (1), and a water side outlet of the heat supply network heater (1) is connected with a heat supply network water supply main pipe (10);
the system also comprises a heat pump steam regulating valve (11), an absorption heat pump (12), a heat pump water draining stop valve (13), a heat pump water heating valve (14) and a heat pump waste heat water valve (15), wherein the inlet of the heat pump steam regulating valve (11) is connected to the heating steam main pipe (2) in a side-by-side mode, the outlet of the heat pump steam regulating valve (11) is connected with the steam inlet of the absorption heat pump (12), the water draining outlet of the absorption heat pump (12) is connected with the inlet of the heat pump water draining stop valve (13), the outlet of the heat pump water draining stop valve (13) is connected to the heat network water draining main pipe (3) in a side-by-side mode, the inlet of the heat pump water heating valve (14) is connected to the heat network water returning main pipe (9) in a side-by-side mode, the outlet of the heat pump water heating valve (14) is connected with the water heating inlet of the absorption heat pump (12), and the water heating outlet of the absorption heat pump (12) is connected to the heat network water supplying pipe (10) in a side-by-side mode, an inlet of the heat pump waste heat water valve (15) is connected to a heat supply network water return main pipe (9) in a bypassing manner, an outlet of the heat pump waste heat water valve (15) is connected with a waste heat water inlet of the absorption heat pump (12), a waste heat water outlet of the absorption heat pump (12) is connected with a cooling water inlet of the hydrophobic heat exchanger (4), and a cooling water outlet of the hydrophobic heat exchanger (4) is connected to a heat supply network water supply main pipe (10) in a bypassing manner;
the system further comprises a plant water replenishing tank (16), an accident cooling water pump (17), an accident cooling water valve (18) and an accident cooling water return pipeline (19), wherein an outlet of the plant water replenishing tank (16) is connected with an inlet of the accident cooling water pump (17), an outlet of the accident cooling water pump (17) is connected with an inlet of the accident cooling water valve (18), an outlet of the accident cooling water valve (18) is connected with an accident cooling water inlet of the hydrophobic heat exchanger (4), and an accident cooling water outlet of the hydrophobic heat exchanger (4) is connected with the accident cooling water return pipeline (19);
the condensate fine treatment device (7) is used for a supercritical unit;
the working method comprises the following steps:
1) at the initial stage of a heating season, because the requirement on external heat load is not high, at the moment, a low-pressure cylinder of a supercritical unit is not cut off to operate, heating steam directly enters a heat supply network heater (1) to work, then drain water flows into a heat well (5) through a water drainage heat exchanger (4), is mixed with condensed water from a cooling tower in the heat well (5) to be cooled, and then is sent to a condensed water fine treatment device (7) by a condensed water pump (6) to be treated, then the condensed water is sent to a steam turbine regenerative system through a condensed water pipeline (8) to be heated continuously, return water of the heat supply network enters the heat supply network heater (1) from a return water main pipe (9) of the heat supply network to absorb heat, and then is sent to a heat user through a water supply main pipe (10) of the heat supply network; at the moment, the heat pump steam regulating valve (11), the heat pump drainage stop valve (13), the heat pump heating water valve (14), the heat pump waste heat water valve (15) and the accident cooling water valve (18) are all closed, and the absorption heat pump (12) and the accident cooling water pump (17) do not work;
2) in the deep cold period of the heating season, the external heat load demand is increased, the supercritical unit cuts off the low-pressure cylinder to operate, and the exhaust steam flow of the low-pressure cylinder is extremely low, so that only a very small amount of condensed water cooled by the cooling tower is in the hot well (5); the heat pump steam regulating valve (11), the heat pump drainage stop valve (13), the heat pump heating water valve (14) and the heat pump waste heat water valve (15) are all opened, most of heating steam is sent to the heat supply network heater (1) to work, condensed drainage is sent to the heat supply network drainage main pipe (3), a small part of heating steam is sent to the absorption heat pump (12) through the heat pump steam regulating valve (11) to be used as a driving heat source, and condensed heat pump drainage is also collected into the heat supply network drainage main pipe (3) through the heat pump drainage stop valve (13); most of return water of a heat supply network enters a heat supply network heater (1) from a heat supply network return water main pipe (9) to absorb heat, then the return water is sent to a heat user through a heat supply network water supply main pipe (10), another part of return water of the heat supply network enters an absorption heat pump (12) through a heat pump water heating valve (14) to be heated, circulating water after being heated converges into the heat supply network water supply main pipe (10), another part of return water of the heat supply network enters the absorption heat pump (12) through a heat pump residual heat water valve (15) to be cooled, cooled cooling water is sent into a hydrophobic heat exchanger (4), hydrophobic water sent into the hydrophobic heat exchanger (4) from a heat supply network hydrophobic main pipe (3) is cooled, the cooling water after being heat exchanged converges into the heat supply network water main pipe (10), the cooled hydrophobic water flows into a heat well (5), is mixed with a small amount of condensed water from a cooling tower in the heat well (5) to be cooled, and then the condensed water is sent to a condensed water fine processing device (7) by a condensed water pump (6) to be processed, then the condensed water is sent to a turbine regenerative system through a condensed water pipeline (8) to be heated continuously, at the moment, an accident cooling water valve (18) is closed, and an accident cooling water pump (17) does not work;
3) when the absorption heat pump (12) breaks down in the deep cold period of the heating season, the accident cooling water valve (18) is opened, low-temperature water supplement in the plant water supplement tank (16) is sent to the hydrophobic heat exchanger (4) through the accident cooling water pump (17) to cool and cool the hydrophobic water, the water supplement after heat absorption returns to a plant water supplement system through the accident cooling water return pipeline (19), at the moment, the heat pump steam regulating valve (11), the heat pump hydrophobic stop valve (13), the heat pump heating water valve (14) and the heat pump waste heat water valve (15) can be closed, the hydrophobic water after cooling flows into the hot well (5), mixing with a small amount of condensed water from a cooling tower in a hot well (5) for cooling, sending the mixture to a condensed water fine treatment device (7) by a condensed water pump (6) for treatment, then the condensed water is sent to a turbine regenerative system for continuous heating through a condensed water pipeline (8).
2. The working method of the improved heat supply network drainage system of the supercritical unit as set forth in claim 1, characterized in that: heating steam enters a heat supply network heater (1) for heating, then drained water enters a drain heat exchanger (4) through a heat supply network drain main pipe (3), flows into a hot well (5) for heat dissipation, is sent to a condensate fine treatment device (7) for treatment by a condensate pump (6), and is sent to a steam turbine heat recovery system through a condensate pipeline (8) to form a heat supply network drain cooling channel; heating steam enters an absorption heat pump (12) to work, and then drained water is converged into a heat supply network drainage main pipe (3) through a heat pump drainage stop valve (13) to form a heat pump driving steam water delivery channel; the return water of the heat supply network enters a heat supply network heater (1) to absorb heat, and then is sent to a heat user through a heat supply network water supply main pipe (10) to form a heat supply network circulating water channel; the return water of the heat supply network enters an absorption heat pump (12) for heating through a heat pump water heating valve (14) and then flows into a heat supply network water supply main pipe (10) to form a heat pump hot water adding channel; the return water of the heat supply network enters an absorption heat pump (12) through a heat pump waste heat water valve (15) for cooling, the cooled cooling water flows into a hydrophobic heat exchanger (4) for cooling hydrophobic water, and finally flows into a heat supply network water supply main pipe (10) to form a cooling water channel; the water supplement is discharged from a plant water supplement tank (16), and is sent into a hydrophobic heat exchanger (4) to cool the hydrophobic water after passing through an accident cooling water pump (17) and an accident cooling water valve (18), and finally returns to a plant water supplement system to form an accident working condition cooling water channel.
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