CN111878802B - Heat utilization system of slag cooler and low temperature economizer of circulating fluidized bed heating unit - Google Patents
Heat utilization system of slag cooler and low temperature economizer of circulating fluidized bed heating unit Download PDFInfo
- Publication number
- CN111878802B CN111878802B CN202010874913.1A CN202010874913A CN111878802B CN 111878802 B CN111878802 B CN 111878802B CN 202010874913 A CN202010874913 A CN 202010874913A CN 111878802 B CN111878802 B CN 111878802B
- Authority
- CN
- China
- Prior art keywords
- low
- water
- slag cooler
- water inlet
- pressure heater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002893 slag Substances 0.000 title claims abstract description 148
- 238000010438 heat treatment Methods 0.000 title claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 374
- 238000009833 condensation Methods 0.000 claims description 35
- 230000005494 condensation Effects 0.000 claims description 35
- 230000001105 regulatory effect Effects 0.000 claims description 35
- 239000013049 sediment Substances 0.000 claims 3
- 230000008859 change Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- 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
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
-
- 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
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
-
- 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
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a slag cooler and low-temperature economizer heat utilization system of a circulating fluidized bed heat supply unit, which comprises a slag cooler, a low-temperature economizer, a #3 low-pressure heater, a #2 low-pressure heater and a #1 low-pressure heater, wherein condensed water is heated by the #3 low-pressure heater and then is conveyed to the slag cooler, and the slag cooler and the low-temperature economizer are connected in series through a slag cooler water outlet pipeline; the utility model also comprises a plate heat exchanger for exchanging heat of the urban heat supply network circulating water, the plate heat exchanger is connected in series with the low-temperature economizer through a water outlet pipeline of the low-temperature economizer, a condensed water inlet end and a condensed water outlet end of the plate heat exchanger are connected in parallel with a plate exchange bypass pipeline, and water outlets of the plate exchange bypass pipeline are respectively communicated with water inlet pipelines of the #1 low-pressure heater and the #2 low-pressure heater. By adopting the invention, the heat utilization rate of the slag cooler and the low-temperature economizer can be improved, and the operation efficiency of the low-pressure heater and the thermal efficiency of the power station can be improved.
Description
Technical Field
The invention relates to the technical field of circulating fluidized bed boilers, in particular to a heat utilization system of a slag cooler and a low-temperature economizer of a circulating fluidized bed heating unit.
Background
The circulating fluidized bed heat supply unit has the advantages of wide fuel adaptability, high combustion efficiency, high-efficiency desulfurization, low NOx emission, simple structure, convenient operation and the like, and is widely applied to the electric power field. At present, in the thermal production operation of a circulating fluidized bed boiler, condensate water is generally adopted to absorb heat of a slag cooler and a low-temperature economizer in the boiler system, and the recovered heat is transferred to the condensate water system.
However, the production mode has certain defects, firstly, the heat recovery of the slag cooler and the low-temperature economizer has lower heat efficiency under the pure condensation working condition of the power station; secondly, the reduction of the condensate water through flow of the low-pressure heater leads to the reduction of the condensate extraction amount, so that the operation efficiency of the low-pressure heater of the steam turbine system can be reduced, and the temperature of condensate water to the deaerator outlet water is further reduced, and the thermal efficiency of a power station is influenced. Therefore, the heat recovery system of the slag cooler and the low-temperature economizer of the circulating fluidized bed boiler needs to be redesigned and modified.
Disclosure of Invention
In order to solve the technical problems, the invention provides a slag cooler and low-temperature economizer heat utilization system of a circulating fluidized bed heating unit, which can improve the residual heat utilization rate of the slag cooler and the low-temperature economizer and the operation efficiency of a low-pressure heater and the thermal efficiency of a power station.
In order to achieve the technical purpose, the invention adopts the following technical scheme: the heat utilization system of the slag cooler and the low-temperature economizer of the circulating fluidized bed heat supply unit comprises the slag cooler, the low-temperature economizer and a #3 low-pressure heater, a #2 low-pressure heater and a #1 low-pressure heater which are used for heating condensed water step by step, wherein the condensed water is heated by the #3 low-pressure heater and then is conveyed to the slag cooler, and the slag cooler is connected with the low-temperature economizer in series through a slag cooler water outlet pipeline; the utility model provides a solar energy heat exchanger, including the urban heat supply network circulating water, still contain the plate heat exchanger that is used for exchanging heat with urban heat supply network circulating water, plate heat exchanger heat supply network side is established ties with urban heat supply network circulating line through plate heat exchange network side water inlet manual valve and plate heat exchange network side water outlet manual valve respectively, plate heat exchanger establishes ties with low-temperature economizer through low-temperature economizer water outlet pipe, and plate heat exchanger's condensation water side water inlet end and condensation water side water outlet end connect in parallel have the plate to trade bypass pipeline, are provided with plate to trade condensation water side water inlet electric valve, plate to trade condensation water side water outlet electric valve, plate to trade bypass water inlet electric valve on the plate to trade bypass pipeline respectively, plate to trade bypass pipeline's delivery port and #1 low-pressure heater and #2 low-pressure heater's inlet tube intercommunication respectively.
Further, a slag cooler water outlet manual valve is arranged at the slag cooler water outlet, and the slag cooler water outlet manual valve is respectively connected with a low-temperature economizer water inlet pipeline and a slag cooler backwater to low-adding pipeline, and a slag cooler backwater to low-adding pipeline is provided with a slag cooler backwater to low-adding manual valve and a slag cooler backwater to low-adding electric regulating valve.
Further, a slag cooler water inlet electric regulating valve, a slag cooler water inlet manual valve and a flowmeter are sequentially arranged on the slag cooler water inlet pipeline along the flow direction of condensed water, and a water inlet of the slag cooler water inlet electric regulating valve is communicated with a water outlet of the #3 low-pressure heater.
Further, a slag cooler bypass pipeline is connected between the water inlet of the slag cooler water inlet electric regulating valve and the water inlet of the low-pressure heater water inlet electric valve of the #2 low-pressure heater, and the slag cooler bypass pipeline is provided with the slag cooler bypass electric regulating valve.
Further, a water outlet of the low-temperature economizer is provided with a low-temperature economizer water outlet manual valve which is respectively connected with a plate change condensation water side water inlet electric valve and a plate change bypass water inlet electric valve; the low-temperature economizer water inlet is provided with a low-temperature economizer water inlet manual valve and a low-temperature economizer water inlet electric valve, and the low-temperature economizer water inlet manual valve is respectively communicated with the slag cooler water outlet manual valve and the slag cooler water return to low-adding manual valve on a slag cooler water return to low-adding pipeline.
Further, the plate-change bypass water inlet electric valve is respectively communicated with a water inlet of the plate-change condensation water side water inlet electric valve and a water outlet of the plate-change condensation water side water outlet electric valve.
Further, a low-saving backwater to #1 low-adding manual valve and a low-saving backwater to #1 low-adding electric valve are arranged on a pipeline between the water outlet of the plate-exchanging bypass pipeline and the water inlet of the #1 low-pressure heater; the pipeline between the water outlet of the plate-change bypass pipeline and the water inlet of the #2 low-pressure heater is sequentially provided with a low-saving backwater-to- #2 low-adding manual valve and a #2 low-adding water-inlet manual total valve along the flow direction of condensed water, and the water inlet of the #2 low-adding water-inlet manual total valve is simultaneously connected with the water outlet of the slag cooler backwater-to-low-adding electric valve on the backwater-to-low-adding pipeline.
Further, the water inlet and the water outlet of the #1 low-pressure heater, the #2 low-pressure heater and the #3 low-pressure heater are respectively provided with a low-pressure heater water inlet electric valve and a low-pressure heater water outlet electric valve.
Further, a water inlet of the low-pressure heater water inlet electric valve and a water outlet of the low-pressure heater water outlet electric valve are respectively communicated with a low-pressure heater bypass pipeline, and the low-pressure heater bypass pipeline is provided with the low-pressure heater bypass electric valve.
According to the invention, the following beneficial effects can be achieved:
1. the slag cooler and the low-temperature economizer are arranged in series, and the condensation water can simultaneously recover the heat of the slag cooler and the low-temperature economizer through one-time circulation, so as to improve the temperature of the condensation water.
2. Through establishing ties plate heat exchanger in urban heat supply network water circulation pipeline and low-temperature economizer water outlet pipeline, simultaneously because the interior condensate side pressure of plate trade is higher than urban heat supply network lateral pressure, in the board trade operation process, the heat supply circulating water through the heat supply network side is difficult for leaking and leaks into the plate trade condensate side, condensate and urban heat supply network circulating water do not direct contact, do not interfere each other, not only can guarantee the cleanliness factor of condensate quality, can also further guarantee the safe operation each other.
In urban heat supply season, the circulating water of the urban heat supply network is heated by adopting a high-temperature condensed water heat exchange mode, and the low-temperature condensed water after heat exchange is led to the water inlet pipeline of the low-pressure heater so as to improve the temperature of the circulating water of the urban heat supply network, and meanwhile, the temperature of the water outlet is reduced after the condensed water passes through the plate heat exchanger, so that the water inlet water temperature requirement of the #2 low-pressure heater is met. When the urban heat supply needs full-load operation, the low-saving backwater to #1 low-adding manual valve and the low-saving backwater to #1 low-adding electric valve are closed, and the low-saving backwater to #2 low-adding manual valve and the #2 low-adding water manual main valve are opened, so that cooled condensed water is led into the #2 low-pressure heater, the condensed water flow of the #2 low-pressure heater is increased, and the operation efficiency of the #2 low-pressure heater is further improved; when the heat supply temperature needs to be regulated in urban heat supply, the plate-exchange bypass water inlet electric valve is opened again, and part of high-temperature condensate water enters the plate-exchange bypass through the plate-exchange bypass electric valve by regulating the opening amount of the plate-exchange bypass water inlet electric valve, so that the through flow of water entering the plate-exchange condensate water side is reduced, the temperature of the heat supply network circulating water can be flexibly regulated, the degree of plate-exchange investment is adapted, and the requirement of urban heat supply effect is met.
In urban non-heating season, by opening the plate-change bypass water inlet electric valve, the low-saving backwater to the #1 low-adding manual valve and the low-saving backwater to the #1 low-adding electric valve, closing the plate heat exchanger condensate water side water inlet electric valve, the water outlet electric valve and the low-saving backwater to the #2 low-adding manual valve, the flow direction of condensate water in the water outlet pipeline of the economizer can be quickly and conveniently switched, so that the condensate water timely exits the plate heat exchanger and then enters the plate-change bypass, thereby ensuring the stable operation of the system and further improving the heat efficiency of a power station.
3. The return water of the slag cooler is closed to the low-adding electric regulating valve in urban heat supply season by arranging the return water of the slag cooler to the low-adding electric regulating valve on the return water to low-adding pipeline of the slag cooler, and condensed water in the water outlet pipeline of the slag cooler directly enters the plate heat exchanger after being introduced into the low-temperature economizer, so that the heat exchange efficiency of the plate heat exchanger is ensured, the utilization rate of the heat of the condensed water is improved, and the economic benefit of the condensed water is further improved; in urban non-heating season, the slag cooler backwater is opened to the low-pressure electric regulating valve, a certain opening degree is kept, and the running stability of the low-pressure heater and the low-temperature economizer can be ensured.
4. Because three groups of low-pressure heaters are arranged in series, and the manual valve and the electric valve are connected in the water inlet pipeline of the low-pressure heater in series, the condensed water after plate replacement or bypass of the plate replacement can be sent to the low-pressure heaters of different levels for graded heating, so that the condensed water temperature is improved, and the thermal efficiency of a power station is further improved.
5. By arranging the bypass electric valve of the slag cooler, when the slag cooler or a matched pipeline of the slag cooler fails, the slag cooler can be accurately switched and overhauled, so that the safe operation of the whole unit is ensured.
Drawings
FIG. 1 is a schematic diagram of a system for utilizing heat of a slag cooler and a low-temperature economizer of a circulating fluidized bed heating unit according to the present invention.
In the figure, 1, a condensation water pipeline, 2, #3 low-pressure heaters, 3, #3 low-pressure heater water outlet pipelines, 4, a slag cooler bypass electric regulating valve, 5, a slag cooler water inlet electric regulating valve, 6, a slag cooler water inlet manual valve, 7, a flowmeter, 8, a slag cooler water outlet manual valve, 9, a low-temperature economizer water inlet manual valve, 10, a low-temperature economizer water inlet electric valve, 11, a slag cooler water return to low-adding manual valve, 12, a slag cooler water return to low-adding electric regulating valve, 13, a low-temperature economizer water outlet manual valve, 14, a plate-change condensation water side water inlet electric valve, 15, a plate-change condensation water side water outlet electric valve, 16, a plate-change bypass water inlet electric valve, 17, a low-saving water return to #1 low-adding manual valve, 18, low-saving backwater to #1 low-adding electric valve, 19, low-saving backwater to #2 low-adding manual valve, 20, #2 low-adding water manual total valve, 21, #2 low-pressure heater, 22, urban heat supply network circulating pipeline, 23, low-saving backwater to #2 low-adding water pipeline, 24, low-saving backwater to #1 low-adding water pipeline, 25, #1 low-pressure heater, 26, plate exchange bypass pipeline, 27, plate heat exchange network side water inlet manual valve, 28, plate heat exchange network side water outlet manual valve, 29, low-temperature economizer, 30, slag cooler, 31, plate heat exchanger, 32, slag cooler water outlet pipeline, 33, low-temperature economizer water outlet pipeline, 34, slag cooler backwater to low-adding pipeline.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
As shown in fig. 1, the circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system includes a slag cooler 30, a low-temperature economizer 29, and #3 low-pressure heater 2, #2 low-pressure heater 21, and #1 low-pressure heater 25 that progressively heat condensed water. The condensed water is heated by the #3 low-pressure heater 2 and then is conveyed into the slag cooler 30 to cool the coal slag in the slag cooler, and the slag cooler 30 and the low-temperature economizer 29 are connected in series through the slag cooler water outlet pipeline 32, so that the heat of the slag cooler 30 and the low-temperature economizer 29 can be recovered through one cycle of the condensed water, the temperature of the condensed water is further improved, and the heat recovery and utilization efficiency is improved. In addition, the heat utilization system also comprises a plate heat exchanger 31 for exchanging heat of the urban heat supply network circulating water, the plate heat exchanger 31 is connected with the low-temperature economizer 29 in series through a low-temperature economizer water outlet pipeline 33, and condensed water passing through the slag cooler 30 and the low-temperature economizer 29 can be introduced into the condensed water side of the plate heat exchanger 31. The condensation water side water inlet end and the condensation water side water outlet end of the plate heat exchanger 31 are connected with a plate exchange bypass pipeline 26 in parallel, the condensation water side water inlet end, the condensation water side water outlet end and the plate exchange bypass pipeline 26 of the plate heat exchanger 31 are respectively provided with a plate exchange condensation water side water inlet electric valve 14, a plate exchange condensation water side water outlet electric valve 15 and a plate exchange bypass water inlet electric valve 16, the plate exchange bypass water inlet electric valve 16 is closed when the city heat supply season is full, the plate exchange bypass water inlet electric valve is opened when the city heat supply season is not full, and the water outlet of the plate exchange bypass pipeline 26 is respectively communicated with the water inlet pipelines of the #1 low-pressure heater 25 and the #2 low-pressure heater 21.
More specifically, the plate heat exchanger 31 belongs to a surface heat exchanger, the pressure of the plate heat exchange condensation water side is greater than the pressure of the urban heat supply network side, and the heat supply network side of the plate heat exchanger 31 is connected in series with the urban heat supply network circulation pipeline 22 through the plate heat exchange network side water inlet manual valve 27 and the plate heat exchange network side water outlet manual valve 28, respectively. And the water inlet and outlet of the low-pressure heater 25 of #1, the water inlet and outlet of the low-pressure heater 21 of #2 and the water outlet of the low-pressure heater 2 of #3 are respectively provided with a low-pressure heater water inlet electric valve and a low-pressure heater water outlet electric valve so as to control condensed water to smoothly flow into the low-pressure heater, thereby ensuring the thermal efficiency of the low-pressure heater. The water inlet of the low-pressure heater water inlet electric valve and the water outlet of the low-pressure heater water outlet electric valve are respectively connected with a low-pressure heater bypass pipeline, and the low-pressure heater bypass pipeline is provided with the low-pressure heater bypass electric valve. The low-pressure heater bypass electric valve is in a normally closed state and is opened only when the low-pressure heater fails, so that the loop can be timely and accurately overhauled.
As shown in fig. 1, a water outlet of the slag cooler 30 is provided with a slag cooler water outlet manual valve 8, the slag cooler water outlet manual valve 8 is respectively connected with a water inlet pipeline of the low-temperature economizer 29 and a slag cooler water return-to-low adding pipeline 34, and condensed water directly flows into the water inlet pipeline of the low-temperature economizer 29 through the slag cooler water outlet manual valve 8 without passing through the slag cooler water return-to-low adding pipeline 34 during urban heat supply seasons; in the non-heating season, the water flows through the water inlet pipeline of the low-temperature economizer 29 and the water return of the slag cooler to the low-adding pipeline 34. The slag cooler backwater-to-low adding pipeline 34 is provided with a slag cooler backwater-to-low adding manual valve 11 and a slag cooler backwater-to-low adding electric regulating valve 12. The manual valve 11 for returning the slag cooler to low adding and the electric regulating valve 12 for returning the slag cooler to low adding are closed in urban heat supply seasons, and the manual valve 11 for returning the slag cooler to low adding is fully opened in urban non-heat supply seasons, so that the opening of the electric regulating valve 12 for returning the slag cooler to low adding is kept about 10%. The water inlet pipeline of the slag cooler 30 sequentially flows into the slag cooler water inlet electric regulating valve 5, the slag cooler water inlet manual valve 6 and the flowmeter 7 along the flow direction of condensed water, and then enters the slag cooler. The water inlet of the water inlet electric regulating valve 5 of the slag cooler is communicated with the water outlet of the #3 low-pressure heater 2, so that condensation water preheated by the #3 low-pressure heater 2 can flow into the slag cooler, and meanwhile, the opening of the water inlet electric regulating valve 5 of the slag cooler can be regulated, so that the whole unit can be ensured to run stably. A slag cooler bypass pipeline is connected between a water inlet of the slag cooler water inlet electric valve 5 and a water inlet of the low-pressure heater water inlet electric valve of the #2 low-pressure heater 21, the slag cooler bypass pipeline is provided with a slag cooler bypass electric valve 4, and when the slag cooler normally operates, the slag cooler bypass electric valve 4 is in a normally closed state, and only when the slag cooler 30 or a matched pipeline thereof fails, the slag cooler bypass electric valve 4 is opened, so that a worker can overhaul conveniently.
As shown in fig. 1, a low-temperature economizer water outlet manual valve 13 is arranged at the water outlet of the low-temperature economizer 29, and the low-temperature economizer water outlet manual valve 13 is respectively connected with a plate exchange condensate water side water inlet electric valve 14 and a plate exchange bypass water inlet electric valve 16; the low-temperature economizer 29 is provided with a low-temperature economizer water inlet manual valve 9 and a low-temperature economizer water inlet electric valve 10 at the water inlet, and the low-temperature economizer water inlet manual valve 9 is respectively connected with a slag cooler water outlet manual valve 8 and a slag cooler water return to low-adding manual valve 11 on a slag cooler water return to low-adding pipeline 34. When the condensed water flows out of the slag cooler water outlet electric valve 8 in urban heat supply season, the low-temperature economizer water inlet manual valve 9 and the low-temperature economizer water inlet electric valve 10 are opened, and the condensed water can flow into the low-temperature economizer 29; when the city is not in the heating season, after the condensed water flows out of the slag cooler water outlet electric valve 8, the low-temperature economizer water inlet manual valve 9, the low-temperature economizer water inlet electric valve 10 and the slag cooler water return to the low-adding manual valve 11 are opened, and the condensed water simultaneously flows into the low-temperature economizer 29 and the slag cooler water return to the low-adding pipeline 34.
Preferably, the plate change bypass water inlet electric valve 16 is respectively communicated with a water inlet of the plate change condensation water side water inlet electric valve 14 and a water outlet of the plate change condensation water side water outlet electric valve 15. A low-saving backwater to #1 low-adding manual valve 17 and a low-saving backwater to #1 low-adding electric valve 18 are arranged on a pipeline between the water outlet of the plate-exchanging bypass pipeline 26 and the water inlet of the #1 low-pressure heater 25; the pipeline between the water outlet of the plate exchange bypass pipeline 26 and the water inlet of the #2 low-pressure heater 21 is sequentially provided with a low-saving backwater-to- #2 low-adding manual valve 19 and a #2 low-adding water-inlet manual total valve 20 along the flow direction of condensed water, and the water inlet of the #2 low-adding water-inlet manual total valve 20 is simultaneously connected with the water outlet of the slag cooler backwater-to-low-adding electric regulating valve 12 on the slag cooler backwater-to-low-adding pipeline 34.
According to the operation requirement, the working principle is as follows:
The condensate water flows into the #3 low-pressure heater 2 through the condensate water pipeline 1, the #3 low-pressure heater 2 preheats the condensate water, then flows into the slag cooler 30 through the slag cooler water inlet electric regulating valve 5, the slag cooler water inlet manual valve 6 and the flowmeter 7 in sequence, cools the coal slag in the slag cooler 30, and then flows out into the slag cooler water outlet pipeline 32 through the slag cooler water outlet manual valve 8.
In the heating season, the temperature of low-saving water after plate heat exchange meets the requirement of #2 low water inlet temperature, the slag cooler backwater to the low-adding manual valve 11, the plate heat exchange bypass electric valve 16, the low-temperature economizer backwater to #1 low-adding manual valve 17 and the low-temperature economizer backwater to #1 low-adding electric valve 18 are closed, condensed water can only flow into the low-temperature economizer 29 through the low-temperature economizer water inlet manual valve 9 and the low-temperature economizer water inlet electric valve 10, high-temperature flue gas is cooled, and condensed water subjected to two waste heat recovery flows into the plate heat exchanger 31 through the low-temperature economizer water outlet manual valve 13, the plate heat exchange condensed water side water inlet electric valve 14 and the plate heat exchange condensed water side water outlet electric valve 15, so that the condensed water flows into the plate heat exchanger 31 to exchange heat for the circulating water of a heating network. Meanwhile, the plate heat exchanger 31 belongs to a surface heat exchanger, and the pressure of the plate heat exchange condensate side is larger than that of the urban heat supply network side, so that the heat supply network circulating water is not easy to leak and enter the plate heat exchange condensate side in the normal operation process of the plate heat exchanger, and the condensate and the urban heat supply network circulating water are not in direct contact and are not mutually interfered, and the safe operation between the condensate and the urban heat supply network circulating water can be ensured.
The condensed water after heat exchange enters a plate exchange bypass 26 through a plate exchange condensed water side water outlet electric valve 15, then enters a #2 low-pressure heater 21 for heating after passing through a low-saving backwater to a #2 low-pressure manual valve 19 and a #2 low-pressure water inlet manual total valve 20, then enters a #1 low-pressure heater 25 for heating, and finally, the heated condensed water flows into the next procedure of a steam turbine system.
When the heat supply temperature of the circulating water of the urban heat supply network needs to be regulated, the plate-exchange bypass water inlet electric valve 16 is opened, the opening amount of the plate-exchange bypass water inlet electric valve 16 is regulated, and a part of high-temperature condensed water enters the plate-exchange bypass pipeline 26 through the plate-exchange bypass electric valve 16, so that the through flow of the water entering the side of the plate-exchange condensed water is reduced, the temperature of the circulating water of the heat supply network can be flexibly regulated, the input degree of the plate exchange is adapted, and the requirement of the urban heat supply effect is met.
According to city heat supply season of 2019-2020, when the unit runs at 85% rated load, the condensation water temperature of the water outlet pipeline of the #3 low-pressure heater is about 55 ℃, the condensation water side and return water temperature of the plate heat exchanger is about 81 ℃, the temperature of the water is 55 ℃, and the flow is 322t/h; the temperature of the circulating water side of the urban heat supply network of the plate heat exchanger is 47 ℃ and 72 ℃, the flow is 304t/h, the calculated heat efficiency is nearly 91%, and the annual income is nearly 130 ten thousand yuan.
When the city is in non-heating season, the low-saving water outlet temperature meets the requirement of the water inlet temperature of the #1 low-pressure heater, the slag cooler backwater is opened to the low-adding manual valve 11, the plate-change bypass water inlet electric door 16, the low-saving backwater is opened to the #1 low-adding manual valve 17, the low-saving backwater is opened to the #1 low-adding electric valve 18, the plate-change condensate side water inlet electric valve 14, the plate-change condensate side water outlet electric valve 15 and the low-saving to #2 low-adding manual valve 19 are closed, meanwhile, the slag cooler backwater is opened to the low-adding electric regulating valve 12 by about 10%, and a small part of condensate water flows into the #2 low-adding water main valve 20 through the slag cooler backwater to the low-adding pipeline 34 and then flows into the #2 low-pressure heater for heating; most of the condensed water flows into the low-temperature economizer 29, flows into the plate-change bypass pipeline 26 through the plate-change bypass electric valve 16, flows into the #1 low-pressure heater 25 for heating through the low-pressure return water to the #1 low-pressure manual valve 17 and the low-pressure return water to the #1 low-pressure electric valve 18, and finally flows into the next process of the steam turbine system after heating.
In the normal operation process, the slag cooler bypass electric regulating valve 4 and the low-pressure heater bypass electric valve are in a closed state, and when a pipeline fails, the slag cooler bypass electric regulating valve 4 and the low-pressure heater bypass electric valve are opened so as to ensure timely and effective overhaul of the pipeline.
It should be noted that the above embodiments are only for illustrating the present invention, but the present invention is not limited to the above embodiments, and any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention falls within the protection scope of the present invention.
Claims (9)
1. The utility model provides a circulating fluidized bed heating unit cold sediment ware and low-temperature economizer heat utilization system, contains cold sediment ware (30), low-temperature economizer (29) and with the #3 low-pressure heater (2) of condensate water step by step heating, #2 low-pressure heater (21) and #1 low-pressure heater (25), and condensate water carries to cold sediment ware (30) after #3 low-pressure heater (2) heating, its characterized in that: the slag cooler (30) and the low-temperature economizer (29) are connected in series through a slag cooler water outlet pipeline (32); the urban heat supply system further comprises a plate heat exchanger (31) for exchanging heat of urban heat supply network circulating water, wherein the heat supply network side of the plate heat exchanger (31) is connected with the urban heat supply network circulating pipeline (22) in series through a plate heat exchange network side water inlet manual valve (27) and a plate heat exchange network side water outlet manual valve (28) respectively; the condensation water side of the plate heat exchanger (31) is connected in series with the low-temperature economizer (29) through a low-temperature economizer water outlet pipeline (33), a plate exchange bypass pipeline (26) is connected in parallel with the condensation water side water inlet end and the condensation water side water outlet end of the plate heat exchanger (31), a plate exchange condensation water side water inlet electric valve (14), a plate exchange condensation water side water outlet electric valve (15) and a plate exchange bypass water inlet electric valve (16) are respectively arranged on the condensation water side water inlet end, the condensation water side water outlet end and the plate exchange bypass pipeline (26) of the plate heat exchanger (31), and water outlets of the plate exchange bypass pipeline (26) are respectively communicated with the water inlet pipelines of the #1 low-pressure heater (25) and the #2 low-pressure heater (21).
2. The circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system of claim 1, wherein: the water outlet of the slag cooler (30) is provided with a slag cooler water outlet manual valve (8), the slag cooler water outlet manual valve (8) is respectively connected with a low-temperature economizer (29) water inlet pipeline and a slag cooler water return to low-adding pipeline (34), and the slag cooler water return to low-adding pipeline (34) is provided with a slag cooler water return to low-adding manual valve (11) and a slag cooler water return to low-adding electric regulating valve (12).
3. The circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system of claim 1, wherein: the water inlet of the slag cooler (30) is sequentially provided with a slag cooler water inlet electric regulating valve (5), a slag cooler water inlet manual valve (6) and a flowmeter (7) along the flow direction of condensate water, and the water inlet of the slag cooler water inlet electric regulating valve (5) is communicated with the water outlet of the #3 low-pressure heater (2).
4. The circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system of claim 3, wherein: a slag cooler bypass pipeline is connected between a water inlet of the slag cooler water inlet electric regulating valve (5) and a water inlet of the low-pressure heater water inlet electric valve of the #2 low-pressure heater (21), and the slag cooler bypass pipeline is provided with a slag cooler bypass electric regulating valve (4).
5. The circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system of claim 2, wherein: the water outlet of the low-temperature economizer (29) is provided with a low-temperature economizer water outlet manual valve (13), and the low-temperature economizer water outlet manual valve (13) is respectively connected with a plate-change condensation water side water inlet electric valve (14) and a plate-change bypass water inlet electric valve (16); the low-temperature economizer (29) water inlet is provided with a low-temperature economizer water inlet manual valve (9) and a low-temperature economizer water inlet electric valve (10), and the low-temperature economizer water inlet manual valve (9) is respectively communicated with the slag cooler water outlet manual valve (8) and the slag cooler water return to low-adding manual valve (11) on a slag cooler water return to low-adding pipeline (34).
6. The circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system of claim 1, wherein: the plate exchange bypass water inlet electric valve (16) is respectively communicated with a water inlet of the plate exchange condensation water side water inlet electric valve (14) and a water outlet of the plate exchange condensation water side water outlet electric valve (15).
7. The circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system of claim 1, wherein: a low-saving backwater to #1 low-adding manual valve (17) and a low-saving backwater to #1 low-adding electric valve (18) are arranged on a pipeline between a water outlet of the plate-exchanging bypass pipeline (26) and a water inlet of the #1 low-pressure heater (25); the pipeline between the water outlet of the plate-change bypass pipeline (26) and the water inlet of the #2 low-pressure heater (21) is sequentially provided with a low-saving backwater-to- #2 low-adding manual valve (19) and a #2 low-adding water-inlet manual total valve (20) along the flow direction of condensed water, and the water inlet of the #2 low-adding water-inlet manual total valve (20) is simultaneously connected with the water outlet of the backwater-to-low-adding electric regulating valve (12) of the slag cooler on the backwater-to-low-adding pipeline (34).
8. The circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system of claim 1, wherein: the water inlet and the water outlet of the #1 low-pressure heater (25), the #2 low-pressure heater (21) and the #3 low-pressure heater (2) are respectively provided with a low-pressure heater water inlet electric valve and a low-pressure heater water outlet electric valve.
9. The circulating fluidized bed heating unit slag cooler and low-temperature economizer heat utilization system of claim 8, wherein: the water inlet of the low-pressure heater water inlet electric valve and the water outlet of the low-pressure heater water outlet electric valve are respectively communicated with a low-pressure heater bypass pipeline, and the low-pressure heater bypass pipeline is provided with the low-pressure heater bypass electric valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874913.1A CN111878802B (en) | 2020-08-27 | 2020-08-27 | Heat utilization system of slag cooler and low temperature economizer of circulating fluidized bed heating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874913.1A CN111878802B (en) | 2020-08-27 | 2020-08-27 | Heat utilization system of slag cooler and low temperature economizer of circulating fluidized bed heating unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111878802A CN111878802A (en) | 2020-11-03 |
| CN111878802B true CN111878802B (en) | 2024-11-26 |
Family
ID=73199331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010874913.1A Active CN111878802B (en) | 2020-08-27 | 2020-08-27 | Heat utilization system of slag cooler and low temperature economizer of circulating fluidized bed heating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111878802B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113669716B (en) * | 2021-06-29 | 2024-03-19 | 华能国际电力股份有限公司大连电厂 | Low-temperature economizer and drainage recovery coupling water supply system and method |
| CN114001348B (en) * | 2021-11-24 | 2023-08-25 | 三河发电有限责任公司 | Thermodynamic system |
| CN116379495B (en) * | 2023-03-30 | 2025-08-19 | 烟台500供热有限公司 | System and method for improving heat supply capacity of heat supply unit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212456819U (en) * | 2020-08-27 | 2021-02-02 | 李广建 | Slag cooler and low temperature economizer heat utilization system of circulating fluidized bed heating unit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2037741C1 (en) * | 1991-03-29 | 1995-06-19 | Государственный научно-исследовательский институт им.Г.М.Кржижановского | Boiler |
| CN203836943U (en) * | 2014-05-09 | 2014-09-17 | 邯郸学院 | Low-temperature coal economizer of 300MW circulating fluidized bed boiler |
| CN110836365A (en) * | 2019-12-11 | 2020-02-25 | 中国电力工程顾问集团西北电力设计院有限公司 | Waste heat utilization system and method for circulating fluidized bed boiler of thermal power plant |
-
2020
- 2020-08-27 CN CN202010874913.1A patent/CN111878802B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212456819U (en) * | 2020-08-27 | 2021-02-02 | 李广建 | Slag cooler and low temperature economizer heat utilization system of circulating fluidized bed heating unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111878802A (en) | 2020-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106090880B (en) | A kind of machine stove set heat circulation afterheat recycling system | |
| CN102252339B (en) | System for reducing discharge smoke temperature of power station boiler | |
| CN101737766A (en) | Coal-water boiler exhaust gas residual heat recovery device | |
| CN101900347A (en) | System for high-grade recycling waste heat of smoke discharged from boiler of power station | |
| CN111878802B (en) | Heat utilization system of slag cooler and low temperature economizer of circulating fluidized bed heating unit | |
| CN201764527U (en) | Thermal power plant boiler exhaust heat recovery and utilization system | |
| CN102230615B (en) | Combined type flue gas residual heat comprehensive utilization system | |
| CN202973061U (en) | Power station engine and boiler integrated cold end comprehensive optimization system | |
| CN214370116U (en) | Intelligent diagnosis module based on large air preheater air heater system operation control | |
| CN201606865U (en) | A water-medium boiler exhaust waste heat recovery device | |
| CN112128732B (en) | A coupling improvement system for energy quality of exhausted steam and waste heat of flue gas | |
| CN201163019Y (en) | System connection device for low temperature economizer | |
| CN212456819U (en) | Slag cooler and low temperature economizer heat utilization system of circulating fluidized bed heating unit | |
| CN110864274B (en) | Hot water recycling system for flue gas waste heat recovery | |
| CN217538807U (en) | Condenser circulating water waste heat utilization equipment based on heat pump | |
| CN201779684U (en) | High-grade recycling system for exhaust heat of power station boiler | |
| CN107345656A (en) | A kind of steam raising plant using residual heat from boiler fume | |
| CN102494329B (en) | Boiler flue gas waste heat comprehensive utilization device | |
| CN202109463U (en) | A combined flue gas waste heat comprehensive utilization system | |
| CN210424999U (en) | Flue gas waste heat recovery system with interconnected pipelines | |
| CN206755129U (en) | A kind of steam raising plant using residual heat from boiler fume | |
| CN214745984U (en) | A heating system with a secondary low temperature economizer | |
| CN112856380B (en) | A generalized heat recovery system for boiler and heat recovery method | |
| CN206330139U (en) | A kind of smoke waste heat utilization system | |
| CN212431847U (en) | Flue gas waste heat utilization system for heating cold air by utilizing condensation water thermal cycle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |