CN213630645U - System for preparing domestic hot water by recycling low-temperature flue gas waste heat - Google Patents
System for preparing domestic hot water by recycling low-temperature flue gas waste heat Download PDFInfo
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- CN213630645U CN213630645U CN202022395377.5U CN202022395377U CN213630645U CN 213630645 U CN213630645 U CN 213630645U CN 202022395377 U CN202022395377 U CN 202022395377U CN 213630645 U CN213630645 U CN 213630645U
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- water
- flue gas
- storage tank
- heat exchange
- domestic hot
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 181
- 239000003546 flue gas Substances 0.000 title claims abstract description 87
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000002918 waste heat Substances 0.000 title claims abstract description 25
- 238000004064 recycling Methods 0.000 title description 3
- 239000008236 heating water Substances 0.000 claims abstract description 19
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 7
- 238000002360 preparation method Methods 0.000 abstract description 6
- 239000003517 fume Substances 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 description 8
- 239000000779 smoke Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 5
- 238000004134 energy conservation Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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Classifications
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/18—Domestic hot-water supply systems using recuperated or waste heat
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The utility model provides a system for through retrieving low temperature flue gas waste heat preparation life hot water relates to waste heat utilization equipment technical field, has solved low temperature fume emission and has caused the problem of pollution. The system comprises a boiler, a first flue gas valve, a flue gas heat exchanger, a second flue gas valve, a circulating water pump, a heating water tank, a heat exchange water storage tank and an electric valve, wherein a pipeline for exhausting gas of the boiler is connected with the flue gas heat exchanger, and the upstream and the downstream of the flue gas heat exchanger are respectively provided with the first flue gas valve and the second flue gas valve; a water outlet pipe of the circulating water pump is connected with a water inlet pipe of the flue gas heat exchanger, a water outlet pipe of the flue gas heat exchanger is connected with a heat exchange water storage tank, the heat exchange water storage tank is connected with a heating water tank, and a water inlet pipe of the circulating water pump is communicated with the heating water tank; the heat exchange water storage tank is also communicated with the steam pipeline and is also respectively connected with a water supply pipe and a water replenishing pipe. The system repeatedly utilizes the low-temperature hot flue gas of the boiler, heats water in the domestic hot water circulating pipeline, is controlled by the multiple valves, and is safe and reliable.
Description
Technical Field
The utility model belongs to the technical field of waste heat utilization equipment technique and specifically relates to a system of flue gas utilization and preparation of life hot water.
Background
At present, under the guidance of energy conservation and emission reduction and low-carbon economy development, waste heat recovery and utilization of flue gas are paid more and more attention, the general exhaust temperature of industrial flue gas is higher, the flue gas recovery can be used for producing steam, and specifically, a waste heat recovery system of equipment such as a converter and a heating furnace is utilized to generate saturated steam to drive a special saturated steam turbo generator unit to generate power. However, the civil boiler generally has lower exhaust gas temperature, the flue gas of the steam boiler can be supplied with water for preheating, and the hot water boiler can utilize the waste heat of the flue gas to return water for heating, thereby realizing the reutilization of the boiler. After the flue gas is utilized, the exhaust gas temperature of the boiler flue gas is still above 60 ℃, most of heat of the flue gas at the temperature is not utilized, the temperature of the flue gas is too low, the content of condensed water in the flue gas is high, the exhaust gas generates white smoke, the temperature of the flue gas at the temperature is too low, the heat energy in the low-temperature flue gas cannot be recovered by the existing recycling mode, and in order to further recover the waste heat in the flue gas and simultaneously avoid the generation of the white smoke, the requirements of energy conservation and environmental protection are met, and the waste heat recovery mode of the flue gas needs to be further improved.
SUMMERY OF THE UTILITY MODEL
In order to recycle the heat energy that contains in the low temperature flue gas that the boiler discharged, further reduce the temperature of fume emission, the utility model provides a system for preparing life hot water through retrieving low temperature flue gas waste heat, specific technical scheme as follows.
A system for preparing domestic hot water by recovering low-temperature flue gas waste heat comprises a boiler, a first flue gas valve, a flue gas heat exchanger, a second flue gas valve, a circulating water pump, a heating water tank and a heat exchange water storage tank, wherein a flue gas pipeline exhausted by the boiler is connected with the flue gas heat exchanger, and the upstream and the downstream of the flue gas heat exchanger are respectively provided with the first flue gas valve and the second flue gas valve; the water outlet pipe of the circulating water pump is connected with the water inlet pipe of the flue gas heat exchanger, the water outlet pipe of the flue gas heat exchanger is connected with the heat exchange water storage tank, the heat exchange water storage tank is connected with the heating water tank, and the water inlet pipe of the circulating water pump is communicated with the heating water tank; the heat exchange water storage tank is also communicated with a steam pipeline, and the water supply pipe and the water replenishing pipe are respectively connected with the heat exchange water storage tank.
Preferably, a first electric valve is arranged on the connecting water pipe between the heating water tank and the heat exchange water storage tank.
Preferably, a domestic hot water circulating pump is arranged on a water supply pipe connected with the heat exchange water storage tank, a water outlet pipe of the domestic hot water circulating pump is connected with the domestic water unit, and a water return pipe of the domestic water unit is communicated with the water replenishing pipe.
It is also preferable that the water replenishing pipe is provided with a second electric valve.
Still preferably, be provided with the level gauge in the heat transfer storage water tank, the level gauge with the linkage of second motorised valve sets up.
It is also preferred that the flue gas temperature at the second flue gas valve position is less than 30 ℃.
Further preferably, the steam pipeline is provided with a third electric valve.
Further preferably, a temperature sensor is arranged in the heat exchange water storage tank, and the temperature sensor and the third electric valve are arranged in a linkage manner.
The utility model provides a pair of system's hot water of life is prepared through retrieving low temperature flue gas waste heat beneficial effect is: heating the primary side heating backwater by using a flue gas heat exchanger, and reducing the emission temperature of the flue gas; the temperature of the domestic water is further regulated in the heat exchange water storage tank, and the water temperature and the water level in the water storage tank can be further regulated and controlled by arranging the plurality of electric valves, so that energy conservation and emission reduction are realized, the operation is stable, and the safe and efficient hot water preparation is realized.
Drawings
FIG. 1 is a schematic diagram of a system for preparing domestic hot water by recovering waste heat of low-temperature flue gas;
FIG. 2 is a piping connection diagram of a system for preparing domestic hot water by recovering waste heat of low-temperature flue gas;
in the figure: 1-boiler, 2-first flue gas valve, 3-flue gas heat exchanger, 4-second flue gas valve, 5-circulating water pump, 6-heating water tank, 7-heat exchange water storage tank, 8-first electric valve, 9-second electric valve, 10-third electric valve, and 11-domestic hot water circulating water pump.
Detailed Description
With reference to fig. 1 and fig. 2, a specific embodiment of a system for preparing domestic hot water by recovering low-temperature flue gas waste heat according to the present invention will be described.
The utility model provides a system for through retrieving low temperature flue gas waste heat preparation life hot water specifically includes boiler 1, first flue gas valve 2, gas heater 3, second flue gas valve 4, circulating water pump 5, heating water tank 6, heat transfer storage water tank 7 and motorised valve, and each constitutional part of this system mutually supports, maintains the stability of temperature in the heat transfer storage water tank jointly, controls rivers circulation through the circulating water pump to continuously carry out the heat exchange, adjust the temperature, preparation life hot water.
The flue gas pipeline of boiler 1 exhaust links to each other with gas heater 3, specifically links to each other through the pipeline of discharging fume, is provided with first flue gas valve 2 and second flue gas valve 4 respectively in gas heater 3's upper reaches and low reaches to effectual control is discharged fume, can also discharge fume according to the temperature monitoring control to the flue gas. A water outlet pipe of the circulating water pump 5 is connected with a water inlet pipe of the flue gas heat exchanger, a water outlet pipe of the flue gas heat exchanger 3 is connected with a heat exchange water storage tank 7, the heat exchange water storage tank 7 is connected with a heating water tank 6, and a water inlet pipe of the circulating water pump 5 is communicated with the heating water tank; the circulation of the primary side heating water supply is realized by utilizing the circulating water pump. The heat exchange water storage tank 7 is also communicated with a steam pipeline, so that domestic water in the heat exchange water storage tank 7 can be directly heated, and the water supply pipe and the water replenishing pipe are respectively connected with the heat exchange water storage tank 7, so that circulation of one side of the domestic water is realized.
A first electric valve 8 is arranged on a connecting water pipe between the heating water tank 6 and the heat exchange water storage tank 7, so that the automatic control of the primary side heating backwater circulation is realized.
A domestic hot water circulating water pump is arranged on a water supply pipe connected with the heat exchange water storage tank 7, so that circulation of one side of domestic water is guaranteed, a water outlet pipe of the domestic hot water circulating water pump is connected with a domestic water unit, a water return pipe of the domestic water unit is communicated with a water replenishing pipe, and the domestic water unit can be used at the use end of user products such as heating plates, water heaters and heat exchangers. The water supplementing pipe is provided with a second electric valve 9 for controlling the water level in the domestic water tank. A liquid level meter is arranged in the heat exchange water storage tank, the liquid level meter and the second electric valve 9 are arranged in a linkage mode, and the linkage control is utilized to maintain the water level in the heat exchange water storage tank of the domestic hot water to be stable.
The steam pipeline is provided with a third electric valve 10 for controlling the steam pipeline to heat the heat exchange water storage device. A temperature sensor is arranged in the heat exchange water storage tank 7 and is in linkage with the third electric valve 10, and the stability of water temperature in the heat exchange water storage tank is guaranteed through the linkage control.
The smoke temperature of the second smoke valve 4 is lower than 30 ℃, the smoke temperature of the boiler 1 is reduced to be lower than 30 ℃, the smoke is discharged through a chimney, and the phenomenon of white smoke cannot occur in the smoke discharged at the temperature.
When the system is in operation, flue gas in the boiler, which is generally 60 ℃, enters a flue gas heat exchanger, and primary side heating backwater is heated to 45 ℃ from 25 ℃. And the primary side circulating water pump sends return water in the primary side heating water tank to the flue gas heat exchanger to be heated to 45 ℃, the primary side heating water supply pipe sends water at 45 ℃ to the heat exchange water storage tank, tap water is heated to 40 ℃, and domestic hot water is pumped to a domestic water unit of a user through domestic hot water circulating water for use. When the boiler flue gas can not satisfy the domestic hot water demand, open steam conduit, heat the water in the heat transfer water storage tank, supply the domestic hot water user to use. In addition, the liquid level meter and the second electric valve are arranged in a linkage manner, and when the water level in the heat exchange water storage tank is lower than the set water level, the second electric valve is automatically opened, so that water is supplemented, and the water level in the water tank is ensured; temperature sensor and third motorised valve coordinated control, when the temperature of water in the heat transfer water storage tank is less than the settlement temperature, open the third motorised valve to guarantee the temperature of water.
The system utilizes the flue gas heat exchanger to heat the primary side heating backwater and reduce the emission temperature of the flue gas; the temperature of domestic water is further regulated in the heat exchange water storage tank, and the water temperature and the water level in the water storage tank can be further regulated and controlled by arranging the plurality of electric valves, so that energy conservation and emission reduction are realized, the operation is stable, and the safe and efficient hot water preparation is realized; in addition, the system also has the advantages of simple operation, low labor cost and maintenance cost and the like.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (8)
1. A system for preparing domestic hot water by recovering low-temperature flue gas waste heat is characterized by comprising a boiler, a first flue gas valve, a flue gas heat exchanger, a second flue gas valve, a circulating water pump, a heating water tank and a heat exchange water storage tank, wherein a flue gas pipeline exhausted by the boiler is connected with the flue gas heat exchanger, and the upstream and downstream of the flue gas heat exchanger are respectively provided with the first flue gas valve and the second flue gas valve; the water outlet pipe of the circulating water pump is connected with the water inlet pipe of the flue gas heat exchanger, the water outlet pipe of the flue gas heat exchanger is connected with the heat exchange water storage tank, the heat exchange water storage tank is connected with the heating water tank, and the water inlet pipe of the circulating water pump is communicated with the heating water tank; the heat exchange water storage tank is also communicated with a steam pipeline, and the water supply pipe and the water replenishing pipe are respectively connected with the heat exchange water storage tank.
2. The system for preparing domestic hot water by recovering the waste heat of low-temperature flue gas as claimed in claim 1, wherein a first electric valve is arranged on the connecting water pipe between the heating water tank and the heat exchange water storage tank.
3. The system for preparing domestic hot water by recovering the waste heat of low-temperature flue gas as claimed in claim 1, wherein a domestic hot water circulating water pump is provided on a water supply pipe connected to the heat exchange water storage tank, a water outlet pipe of the domestic hot water circulating water pump is connected to the domestic water unit, and a water return pipe of the domestic water unit is communicated with the water replenishing pipe.
4. The system for preparing domestic hot water by recovering the waste heat of low-temperature flue gas as claimed in claim 1, wherein the water supplementing pipe is provided with a second electric valve.
5. The system for preparing domestic hot water by recovering the waste heat of the low-temperature flue gas as claimed in claim 4, wherein a liquid level meter is arranged in the heat exchange water storage tank, and the liquid level meter and the second electric valve are arranged in a linkage manner.
6. The system for preparing domestic hot water by recovering waste heat of low-temperature flue gas according to claim 1, wherein the flue gas temperature at the position of the second flue gas valve is less than 30 ℃.
7. The system for preparing domestic hot water by recovering the waste heat of low-temperature flue gas as claimed in claim 1, wherein a third electric valve is arranged on the steam pipeline.
8. The system for preparing domestic hot water by recovering the waste heat of low-temperature flue gas as claimed in claim 7, wherein a temperature sensor is arranged in the heat exchange water storage tank, and the temperature sensor and the third electric valve are arranged in a linkage manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022395377.5U CN213630645U (en) | 2020-10-26 | 2020-10-26 | System for preparing domestic hot water by recycling low-temperature flue gas waste heat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022395377.5U CN213630645U (en) | 2020-10-26 | 2020-10-26 | System for preparing domestic hot water by recycling low-temperature flue gas waste heat |
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| Publication Number | Publication Date |
|---|---|
| CN213630645U true CN213630645U (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022395377.5U Active CN213630645U (en) | 2020-10-26 | 2020-10-26 | System for preparing domestic hot water by recycling low-temperature flue gas waste heat |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118776332A (en) * | 2024-07-26 | 2024-10-15 | 冀东水泥璧山有限责任公司 | A cement kiln bypass flue gas waste heat recovery system |
-
2020
- 2020-10-26 CN CN202022395377.5U patent/CN213630645U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118776332A (en) * | 2024-07-26 | 2024-10-15 | 冀东水泥璧山有限责任公司 | A cement kiln bypass flue gas waste heat recovery system |
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