CN110864274B - Hot water recycling system for flue gas waste heat recovery - Google Patents
Hot water recycling system for flue gas waste heat recovery Download PDFInfo
- Publication number
- CN110864274B CN110864274B CN201911220553.7A CN201911220553A CN110864274B CN 110864274 B CN110864274 B CN 110864274B CN 201911220553 A CN201911220553 A CN 201911220553A CN 110864274 B CN110864274 B CN 110864274B
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- China
- Prior art keywords
- flue gas
- waste heat
- gas waste
- heat recovery
- heat exchanger
- Prior art date
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- 239000002918 waste heat Substances 0.000 title claims abstract description 79
- 238000011084 recovery Methods 0.000 title claims abstract description 77
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000003546 flue gas Substances 0.000 title claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000004064 recycling Methods 0.000 title claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 238000000605 extraction Methods 0.000 claims abstract description 13
- 238000009833 condensation Methods 0.000 claims abstract description 6
- 230000005494 condensation Effects 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 5
- 239000003245 coal Substances 0.000 abstract description 6
- 238000010248 power generation Methods 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
-
- 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
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention provides a hot water recycling system for flue gas waste heat recovery, and belongs to the technical field of thermal power generation energy conservation. Heat exchange with flue gas waste heat recovery the device is connected in parallel with the regulating valve; the gate valve and the booster water pump are additionally arranged, and the regulating valve ensures that the condensate flow entering the flue gas waste heat recovery heat exchanger is stable when the steam extraction condensing steam turbine works under the steam extraction working condition; a bypass valve is arranged at the booster water pump, the booster water pump is not put into operation under the pure condensation working condition of the steam turbine, the bypass valve is opened, the system forms open circulation by depending on the allowance of the condensing water pump of the unit, the electricity consumption of the system can be reduced, and the power supply coal consumption can be reduced; and a heater is additionally arranged behind the flue gas waste heat recovery heat exchanger, so that the flue gas waste heat recovery system can realize multi-mode operation, the load adjustment range is large, and the unit adaptability is good. The invention improves the recovery rate of the waste heat of the discharged smoke, reduces the initial investment of equipment, has flexible adjustment and obvious energy-saving effect, and reduces the implementation difficulty of engineering.
Description
Technical Field
The invention relates to a hot water recycling system for flue gas waste heat recovery, and belongs to the technical field of thermal power generation energy conservation.
Background
The price of coal is a main influencing factor affecting the economic benefit of coal-fired power plants. The flue gas waste heat recovery system can recover the waste heat of the discharged flue gas of the boiler so as to save the coal consumption of power generation, so that the flue gas waste heat recovery system is currently used as standard equipment in new coal-fired power generation units in China, and the old power generation units are gradually energy-saving and improved. The flue gas waste heat recovery system generally utilizes boiler exhaust gas to heat unit condensate (as shown in fig. 1), generally uses condensate from a 7 th or 8 th low-pressure heater 2 of a steam turbine as a heat transfer working medium, and connects a flue gas waste heat recovery heat exchanger 6 between the 7 th or 8 th low-pressure heater 2 of the steam turbine and the 6 th low-pressure heater 1. Extracting steam from a low-pressure cylinder of the steam turbine of the displacement part, realizing saving of coal consumption. The system generally uses a condensate pump as the driving force of working medium, and the driving water pump is not increased. However, for the steam extraction and condensing steam turbine generator unit, if the steam extraction and condensing steam turbine generator unit is operated under the working condition of large steam extraction, the flow of condensed water at the outlet of the 7 th-stage low-pressure heater 2 is far smaller than that of the pure condensation working condition, and if the condensed water is used as a working medium, the waste heat of the discharged smoke can not be fully recovered. If two-stage circulation (as shown in figure 2) is adopted, the flow rate of working medium entering the flue gas waste heat recovery heat exchanger 6 is unchanged, and the recovered heat is exchanged out through the water-water heat exchanger 9, the driving water pump and the water-water heat exchanger 9 are additionally arranged in the system, so that the flue gas waste heat recovery efficiency is reduced, and the initial investment of equipment and the engineering implementation difficulty are increased.
Disclosure of Invention
The invention aims to solve the technical problems of improving the recovery efficiency of exhaust gas waste heat and reducing the initial investment of equipment and the implementation difficulty of engineering.
In order to achieve the purpose of solving the problems, the technical scheme adopted by the invention is to provide a hot water recycling system for flue gas waste heat recovery, wherein a flue gas waste heat recovery heat exchanger is connected in parallel between a 7 th or 8 th low-pressure heater and a 6 th low-pressure heater of a steam turbine; the flue gas waste heat recovery heat exchanger is connected in parallel with the flue gas waste heat recovery heat exchanger and then connected with the regulating valve; a gate valve and two booster water pumps are arranged between the regulating valve and the flue gas waste heat recovery heat exchanger; and the gate valve and the two booster water pumps are connected in parallel and then connected in series with the flue gas waste heat recovery heat exchanger.
Preferably, a manual valve is arranged at the inlet or the outlet of the regulating valve in series.
Preferably, a check valve is arranged at the inlet or the outlet of the gate valve in series.
Preferably, the flue gas waste heat recovery heat exchanger is connected in parallel with a plurality of flue gas waste heat recovery heat exchangers, and the number of the flue gas waste heat recovery heat exchangers connected in parallel is at least one.
Preferably, the flue gas waste heat recovery heat exchangers are connected in series in front of and behind, and the number of the flue gas waste heat recovery heat exchangers connected in series is at least one.
Preferably, an isolation valve is arranged at the inlet or the outlet of the flue gas waste heat recovery heat exchanger in series.
Preferably, a heater or a heating network heater is arranged at the outlet of the flue gas waste heat recovery heat exchanger in series.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, the hot water recycling regulating valve is arranged between the outlet and the inlet of the flue gas waste heat recovery heat exchanger, so that the flow of condensate water entering the flue gas waste heat recovery heat exchanger is ensured to be stable when the steam extraction condensing steam turbine works under the steam extraction working condition; a booster water pump is added and a bypass valve is arranged. The booster water pump is not put into operation under the pure condensation working condition of the steam turbine, the bypass valve is opened, the system forms open circulation by depending on the allowance of the condensing water pump of the unit, and the electricity consumption of the system can be reduced, so that the power supply coal consumption is reduced; working condition of steam turbine when the booster water pump is put into operation, the bypass valve is closed.
The water-water heat exchanger is eliminated, and the initial investment of equipment and the engineering implementation difficulty are reduced; the booster water pump is adjusted from full-working condition continuous operation to operation only under the steam extraction working condition, so that the operation cost is reduced. In addition, after the air heater (or other heaters) is additionally arranged, the flue gas waste heat recovery system can realize pure open operation, open-close operation and pure closed operation, and has wide load adjustment range and good unit adaptability.
Drawings
FIG. 1 is a schematic diagram of the composition and operation of a prior art flue gas waste heat recovery system;
FIG. 2 is a schematic diagram of the composition and operation of a prior art flue gas waste heat recovery system with two-stage circulation;
FIG. 3 is a schematic diagram of the composition and operation of the flue gas waste heat recovery system with hot water recirculation of the present invention;
FIG. 4 is a schematic diagram of the composition and operation of the flue gas waste heat recovery system with manual valve and check valve of the present invention;
FIG. 5 is a schematic diagram of the composition and operation of a flue gas waste heat recovery system with two flue gas waste heat recovery heat exchangers in parallel according to the present invention;
fig. 6 is a schematic diagram of the composition and operation of the flue gas waste heat recovery system with a heater (or other heater) of the present invention.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below;
as shown in fig. 1-6, the invention provides a hot water recycling system for flue gas waste heat recovery, wherein a flue gas waste heat recovery heat exchanger 6 is connected in parallel between a 7 th or 8 th low-pressure heater 2 and a 6 th low-pressure heater 1 of a steam turbine; the flue gas waste heat recovery heat exchanger 6 is connected in parallel with the regulating valve M1; a gate valve M2 and two booster water pumps 3 are arranged between the regulating valve M1 and the flue gas waste heat recovery heat exchanger 6; the gate valve M2 and the two booster water pumps 3 are connected in parallel and then connected in series with the flue gas waste heat recovery heat exchanger 6. The manual valve 4 is arranged at the inlet or the outlet of the regulating valve M1 in series. The gate valve M2 is provided with a check valve 5 in series at the inlet or outlet. The flue gas waste heat recovery heat exchanger 6 is connected in parallel with a plurality of flue gas waste heat recovery heat exchangers, or the flue gas waste heat recovery heat exchanger 6 is connected in series with a plurality of flue gas waste heat recovery heat exchangers. An isolation valve is arranged at the inlet or the outlet of the flue gas waste heat recovery heat exchanger 6 in series; the outlet of the flue gas waste heat recovery heat exchanger 6 is serially provided with a heater 7 of a heater or a heating network.
The regulating valve M1, the gate valve M2 and the booster water pump 3 are added in a conventional flue gas waste heat recovery system. When the steam turbine works in the pure condensation working condition, the regulating valve M1 is completely closed, the gate valve M2 is opened, the booster water pump 3 is not put into operation, and the system operation mode is the same as that of a conventional flue gas waste heat recovery system. When the steam turbine works under the steam extraction working condition, the regulating valve M1 is opened, the gate valve M2 is closed, the booster water pump 3 is put into operation, and at the moment, part of condensed water from the outlet of the flue gas waste heat recovery heat exchanger 6is mixed with the condensed water from the original No. 7 and No. 8 low-pressure heaters 2 and then enters the flue gas waste heat recovery heat exchanger 6; the regulating valve M1 is used to regulate the flow of hot water recirculation. The system can ensure the maximum recovery of the flue gas waste heat under various working conditions.
As shown in fig. 4, the regulating valve M1 may be connected with a manual valve 4 in series at its inlet or outlet for easy maintenance; gate valve M2 may be connected in series with a check valve 5 at its inlet or outlet to prevent working fluid from returning to the pump inlet from the booster pump 3 outlet. As shown in fig. 5, the flue gas waste heat recovery heat exchanger 6 can be arranged as a single unit, and a plurality of units can also be operated in series or in parallel. Correspondingly, the inlet and outlet of each heat exchanger can be provided with an isolation valve. As shown in fig. 6, the system can also be provided with a heater 7 of a heater or a heating network after the flue gas waste heat recovery heat exchanger, so as to realize the pure closed operation of the system.
A hot water recycling regulating valve is arranged between an outlet and an inlet of the flue gas waste heat recovery heat exchanger, so that the flow of condensate water entering the flue gas waste heat recovery heat exchanger is ensured to be stable when the steam extraction condensing steam turbine works under a steam extraction working condition;
A gate valve M2 is provided at the booster water pump 3. The booster water pump is not put into operation under the pure condensation working condition of the steam turbine, the gate valve M2 is opened, the system forms open circulation by depending on the allowance of the condensing water pump of the unit, and the electricity consumption of the system can be reduced, so that the power supply coal consumption is reduced; the booster water pump is put into operation under the steam extraction working condition of the steam turbine, the gate valve M2 is closed.
After the warm air device (or other heaters) is additionally arranged behind the flue gas waste heat recovery heat exchanger, the flue gas waste heat recovery system can realize pure open operation, open-close operation and pure closed operation, the load adjusting range is large, and the unit adaptability is good.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.
Claims (5)
1. The application method of the hot water recycling system for flue gas waste heat recovery is characterized by comprising the following steps of:
The hot water recycling system for flue gas waste heat recovery is characterized in that a flue gas waste heat recovery heat exchanger (6) is connected in parallel between a low-pressure heater (2) of a 7 th stage or an 8 th stage of a steam turbine and a low-pressure heater (1) of a 6 th stage; the flue gas waste heat recovery heat exchanger (6) is connected in parallel with the regulating valve (M1); a gate valve (M2) and two booster water pumps (3) are arranged between the regulating valve (M1) and the flue gas waste heat recovery heat exchanger (6); the gate valve (M2) and the two booster water pumps (3) are connected in parallel and then connected in series with the flue gas waste heat recovery heat exchanger (6); a manual valve (4) is arranged at the inlet or the outlet of the regulating valve (M1) in series; a check valve (5) is arranged at the inlet or the outlet of the gate valve (M2) in series; a hot water recycling regulating valve is arranged between the outlet and the inlet of the flue gas waste heat recovery heat exchanger;
When the steam turbine works under the pure condensation working condition, the regulating valve (M1) is completely closed, the gate valve (M2) is opened, and the booster water pump (3) is not put into operation; when the steam turbine works under the steam extraction working condition, the regulating valve (M1) is opened, the gate valve (M2) is closed, the booster water pump (3) is put into operation, and at the moment, part of condensed water from the outlet of the flue gas waste heat recovery heat exchanger (6) is mixed with condensed water originally from the low-pressure heaters (2) of the 7 th level and the 8 th level and then enters the flue gas waste heat recovery heat exchanger (6); the regulating valve (M1) is used for regulating the flow of hot water recirculation.
2. The method of use according to claim 1, wherein: the flue gas waste heat recovery heat exchanger (6) is connected in parallel with the flue gas waste heat recovery heat exchanger, and the number of the flue gas waste heat recovery heat exchangers connected in parallel is at least one.
3. The method of use according to claim 1, wherein: the flue gas waste heat recovery heat exchangers (6) are connected in series in front of and behind, and the number of the flue gas waste heat recovery heat exchangers connected in series is at least one.
4. The method of use according to claim 1, wherein: and an isolation valve is arranged at the inlet or the outlet of the flue gas waste heat recovery heat exchanger (6) in series.
5. The method of use according to claim 1, wherein: and a heater or a heating network heater (7) is connected in series at the outlet of the flue gas waste heat recovery heat exchanger (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220553.7A CN110864274B (en) | 2019-12-03 | 2019-12-03 | Hot water recycling system for flue gas waste heat recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220553.7A CN110864274B (en) | 2019-12-03 | 2019-12-03 | Hot water recycling system for flue gas waste heat recovery |
Publications (2)
| Publication Number | Publication Date |
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| CN110864274A CN110864274A (en) | 2020-03-06 |
| CN110864274B true CN110864274B (en) | 2024-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911220553.7A Active CN110864274B (en) | 2019-12-03 | 2019-12-03 | Hot water recycling system for flue gas waste heat recovery |
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| CN (1) | CN110864274B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113191083B (en) * | 2021-04-30 | 2022-12-02 | 西安交通大学 | Optimization design method of flue gas waste heat recovery system considering all-working-condition external parameter change |
| CN113522002A (en) * | 2021-07-30 | 2021-10-22 | 西安热工研究院有限公司 | A high-efficiency desulfurization absorption tower capable of recovering waste heat from flue gas |
| CN115200403A (en) * | 2022-07-25 | 2022-10-18 | 深圳市晟世环保能源股份有限公司 | High-temperature flue gas waste heat utilization device for biogas generator set and treatment method |
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| CN106123001A (en) * | 2016-06-24 | 2016-11-16 | 福建龙净环保股份有限公司 | A kind of smoke waste heat utilization system and method |
| CN211739051U (en) * | 2019-12-03 | 2020-10-23 | 石家庄良村热电有限公司 | Hot water recirculation system for flue gas waste heat recovery |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7066396B2 (en) * | 2004-10-08 | 2006-06-27 | Gas Technology Institute | Method and apparatus for enhanced heat recovery from steam generators and water heaters |
| CN201251371Y (en) * | 2008-10-17 | 2009-06-03 | 华润电力投资有限公司 | Flue gas pre-cooling system with highly-effective water and energy conservation |
| WO2013028173A1 (en) * | 2011-08-23 | 2013-02-28 | International Engine Intellectual Property Company, Llc | System and method for protecting an engine from condensation at intake |
| CN104006374B (en) * | 2014-06-17 | 2015-12-30 | 中国电力工程顾问集团西南电力设计院有限公司 | Based on condensation water recovery system and the method for work of coagulation hydroenergy backwater heat exchanger |
| CN106123002A (en) * | 2016-07-06 | 2016-11-16 | 大唐(北京)能源管理有限公司 | A kind of flue gas MGGH system and method using condensation water heat exchange |
| CN206919053U (en) * | 2017-07-22 | 2018-01-23 | 山东金由氟节能环保科技有限公司 | A kind of surplus heat collection device for boiler smoke |
-
2019
- 2019-12-03 CN CN201911220553.7A patent/CN110864274B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106123001A (en) * | 2016-06-24 | 2016-11-16 | 福建龙净环保股份有限公司 | A kind of smoke waste heat utilization system and method |
| CN211739051U (en) * | 2019-12-03 | 2020-10-23 | 石家庄良村热电有限公司 | Hot water recirculation system for flue gas waste heat recovery |
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