CN218672242U - Vacuum integrated heat exchange device for flue gas heat exchange in flue - Google Patents
Vacuum integrated heat exchange device for flue gas heat exchange in flue Download PDFInfo
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- CN218672242U CN218672242U CN202223170930.0U CN202223170930U CN218672242U CN 218672242 U CN218672242 U CN 218672242U CN 202223170930 U CN202223170930 U CN 202223170930U CN 218672242 U CN218672242 U CN 218672242U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model provides a vacuum integration heat transfer device for flue gas heat transfer in flue, include: the device comprises a flue, a vacuum heat exchanger, a vacuum pump, a heat exchange medium pump, an input pipeline and an output pipeline; the vacuum heat exchanger is arranged in the flue; the vacuum heat exchanger extends out of the flue and is connected with a vacuum pipeline, and the output end of the vacuum pipeline is communicated with the input end of a vacuum pump and is used for forming vacuum in the vacuum heat exchanger; the vacuum heat exchanger is provided with a heat exchange medium inlet and a heat exchange medium outlet; the input pipeline is provided with a heat exchange medium pump, and the output end of the input pipeline is communicated with the heat exchange medium inlet; a compressor and a liquefier are sequentially arranged on the output pipeline; the input end of the output pipeline is communicated with the heat exchange medium outlet, and the output end of the output pipeline is communicated with the input pipeline and/or the external heat demand end. The utility model discloses effectively optimize the heat exchanger structure, can improve heat exchange efficiency by a wide margin, reduce the cooling water quantity, environmental protection and economic benefits are showing.
Description
Technical Field
The utility model relates to a flue gas heat transfer field in the flue, in particular to vacuum integration heat transfer device for flue gas heat transfer in the flue.
Background
The smoke exhaust loss is the most important heat loss in the operation of the boiler, generally about 5-12 percent, accounting for 60-70 percent of the heat loss of the boiler, and the main factor influencing the heat loss of the smoke exhaust is the smoke exhaust temperature, generally, the smoke exhaust temperature is increased by 0.6-1 percent every time the smoke exhaust temperature is increased by 10 ℃, and correspondingly, the coal consumption is increased by 1.2-2.4 percent. In order to reduce the temperature of the exhaust gas, reduce the loss of the exhaust gas and improve the operation economy of the power plant, a heat exchanger can be additionally arranged on a flue.
In the existing device for recovering the waste heat of the boiler flue gas, which is announced by authorization on 9 th of 2021, 4 th and 9 th, CN214581819U, the device is disclosed to communicate a flue with a heat exchanger so as to transfer the heat of a boiler body to the heat exchanger, water in a water tank is injected into the heat exchanger through a circulating water pump, the water is converted into hot water through the heat exchanger and is injected back into the water tank, the hot water injected back into the water tank is fully mixed with cold water and then enters the boiler body for heating, so that the gas required by combustion of the boiler body can be saved, the efficiency of recovering the waste heat of the boiler flue gas is improved, the emission of harmful gas is reduced, and the environmental pollution is reduced; on the other hand, the problem that the quality safety of the water tank cannot be ensured due to overhigh water temperature can be prevented. The heat exchanger has the disadvantages of low gas-liquid heat exchange efficiency, high circulating water consumption, high investment cost and the like. Therefore, how to effectively optimize the structure of the heat exchanger, improve the heat exchange efficiency and reduce the energy consumption is an important research direction in the field of energy conservation and environmental protection.
SUMMERY OF THE UTILITY MODEL
The technical purpose of the utility model is to provide a vacuum integration heat transfer device for flue gas heat transfer in flue makes it effectively optimize the heat exchanger structure, can improve heat exchange efficiency by a wide margin, reduces the cooling water quantity, environmental protection and economic benefits are showing etc. technical characterstic.
In order to solve the above problem, the technical scheme of the utility model is that:
a vacuum integrated heat exchange device for flue gas heat exchange in a flue comprises: the device comprises a flue, a vacuum heat exchanger, a vacuum pump, a heat exchange medium pump, an input pipeline and an output pipeline;
the vacuum heat exchanger is arranged in the flue;
the vacuum heat exchanger extends out of the flue and is connected with a vacuum pipeline, and the output end of the vacuum pipeline is communicated with the input end of the vacuum pump and is used for forming vacuum in the vacuum heat exchanger;
the vacuum heat exchanger is provided with a heat exchange medium inlet and a heat exchange medium outlet;
the input pipeline is provided with the heat exchange medium pump, the input end of the input pipeline is communicated with an external heat exchange medium supply end, and the output end of the input pipeline is communicated with the heat exchange medium inlet;
a compressor and a liquefier are sequentially arranged on the output pipeline; the input end of the output pipeline is communicated with the heat exchange medium outlet, and the output end of the output pipeline is communicated with the input pipeline and/or the external heat demand end;
the heat exchange medium liquid is input into the vacuum heat exchanger through the input pipeline by the heat exchange medium pump, under the vacuum condition, the low-temperature heat exchange medium liquid absorbs heat in the high-temperature flue gas environment in the flue and evaporates into low-temperature heat exchange medium steam, the low-temperature heat exchange medium steam is compressed into high-temperature heat exchange medium steam through the compressor on the output pipeline, and the high-temperature heat exchange medium steam is liquefied into medium-temperature heat exchange medium liquid at the liquefier and then is converged into the input pipeline and/or an external heat utilization demand end.
Preferably, the flue is provided with a flue inlet at one side of the heat exchange medium inlet, and the flue is provided with a flue outlet at one side of the heat exchange medium outlet.
Preferably, a heat exchange medium valve is arranged on the input pipeline, and the heat exchange medium valve is located between the heat exchange medium pump and the heat exchange medium inlet and used for controlling the flow rate of the heat exchange medium liquid pumped into the heat exchange medium inlet.
Preferably, the input pipeline communicated with the output end of the output pipeline is positioned between the heat exchange medium pump and the heat exchange medium valve.
Preferably, the bottom of the flue is provided with a liquid dredging port for discharging condensate generated by the flue gas.
Preferably, a pressure gauge is connected to the vacuum heat exchanger for detecting the vacuum degree in the vacuum heat exchanger.
Preferably, an exhaust port is arranged at the output end of the vacuum pump and used for exhausting air pumped by the vacuum pump.
Preferably, the vacuum heat exchanger is a tube heat exchanger or a plate heat exchanger.
Preferably, the material of the vacuum heat exchanger is stainless steel.
Preferably, the heat exchange medium is water.
The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:
(1) The utility model discloses to the inefficiency scheduling problem of flue gas heat transfer in the flue, utilize the characteristic that heat transfer medium boiling point reduced under the vacuum condition, adopt vacuum heat exchanger cooperation vacuum pump, with its inside evacuation, when heat transfer medium liquid gets into vacuum heat exchanger inside, can evaporate and absorb a large amount of heats from around to reduce the temperature of vacuum heat exchanger wall and flue gas, reached the technological effect that promotes the efficiency of flue gas heat transfer in the flue by a wide margin.
(2) The utility model discloses to the higher technical problem of flue gas heat transfer cost in the flue, the evaporation latent heat value that adopts heat transfer medium is far greater than heat transfer medium's specific heat value's technical scheme, reached under the same heat load condition, heat transfer medium's quantity reduces by a wide margin, meets the high temperature flue gas heat absorption evaporation in the flue under the vacuum condition and be low temperature heat transfer medium steam, low temperature heat transfer medium steam compresses for high temperature heat transfer medium steam through the compressor on the output pipeline to after liquefier department liquefaction is medium temperature heat transfer medium liquid, can converge the input pipeline forms the circulation, and flue gas heat transfer cost also reduces by a wide margin in making the flue, and the economic benefits who brings is very obvious.
Drawings
FIG. 1 is a schematic structural view of a vacuum integrated heat exchange device for heat exchange of flue gas in a flue.
Description of reference numerals: 1: a flue inlet; 2: a flue; 3: a vacuum heat exchanger; 4: a lyophobic port; 5: a vacuum pump; 6: an exhaust port; 7: a compressor; 8: a liquefier; 9: a heat exchange medium pump; 10: a heat exchange medium valve; 11: a pressure gauge; 12: a flue outlet; 13: and an external heat demand end.
Detailed Description
The following description will be made in detail with reference to the accompanying drawings and specific embodiments for a vacuum integrated heat exchange device for flue gas heat exchange in a flue, which is provided by the present invention. The advantages and features of the present invention will become more fully apparent from the following description and appended claims.
Example 1
Referring to fig. 1, this embodiment provides a vacuum integrated heat exchange device for flue gas heat transfer in the flue, includes: the device comprises a flue 2, a vacuum heat exchanger 3, a vacuum pump 5, a heat exchange medium pump 9, an input pipeline and an output pipeline;
the vacuum heat exchanger 3 is arranged in the flue 2;
the vacuum heat exchanger 3 extends out of the flue 2 and is connected with a vacuum pipeline, the output end of the vacuum pipeline is communicated with the input end of the vacuum pump 5 and is used for forming vacuum in the vacuum heat exchanger 3, the boiling point of a heat exchange medium can be reduced in a vacuum environment, and the heat exchange medium can be evaporated when entering the vacuum heat exchanger 3 so as to absorb a large amount of heat;
the vacuum heat exchanger 3 is provided with a heat exchange medium inlet and a heat exchange medium outlet;
the input pipeline is provided with a heat exchange medium pump 9, the input end of the input pipeline is communicated with the external heat exchange medium supply end, the output end of the input pipeline is communicated with a heat exchange medium inlet, and the heat exchange medium pump 9 provides heat exchange medium liquid for the vacuum heat exchanger 3;
a compressor 7 and a liquefier 8 are sequentially arranged on the output pipeline; the input end of the output pipeline is communicated with the heat exchange medium outlet, and the output end of the output pipeline is communicated with the input pipeline and/or the external heat demand end;
the heat exchange medium liquid is input into the vacuum heat exchanger 3 through the input pipeline by the heat exchange medium pump 9, under the vacuum condition, the low-temperature heat exchange medium liquid absorbs heat in the high-temperature smoke environment in the flue 2 and evaporates into low-temperature heat exchange medium steam, the low-temperature heat exchange medium steam is compressed into high-temperature heat exchange medium steam through the compressor 7 on the output pipeline, and after being liquefied into medium-temperature heat exchange medium liquid at the liquefier 8, the low-temperature heat exchange medium steam can be converged into the input pipeline between the heat exchange medium pump 9 and the heat exchange medium inlet to realize circulation, and can also be converged into the external heat demand end 13 to realize heat source supply.
This embodiment adopts heat transfer medium pump 9 to provide heat transfer medium liquid for vacuum heat exchanger 3, heat transfer medium liquid boiling point reduces under vacuum environment, high temperature flue gas in flue 2 is through vacuum heat exchanger 3, make the evaporation of heat transfer medium liquid in the vacuum heat exchanger 3 become low temperature heat transfer medium steam, low temperature heat transfer medium steam compresses into high temperature heat transfer medium steam through compressor 7 on the output pipeline, and liquefy the technical scheme into medium temperature heat transfer medium liquid in liquefier 8 department, flue gas heat exchange efficiency is high in the flue 2 has been reached, and is with low costs, energy-concerving and environment-protective technical effect.
The present embodiment will now be described in detail:
referring to fig. 1, in this embodiment, a flue 2 inlet is disposed on one side of the heat exchange medium inlet of the flue 2, a flue 2 outlet is disposed on one side of the heat exchange medium outlet of the flue 2, and flue gas is discharged from the flue 2 outlet through the vacuum heat exchanger 3 from the flue 2 inlet, so that efficient heat exchange is realized.
In this embodiment, the input pipeline is provided with a heat exchange medium valve 10, and the heat exchange medium valve 10 is located between the heat exchange medium pump 9 and the heat exchange medium inlet, and is used for controlling the flow rate of the heat exchange medium liquid pumped into the heat exchange medium inlet.
In this embodiment, an input pipeline communicated with an output end of the output pipeline is located between the heat exchange medium pump 9 and the heat exchange medium valve 10, and is used for mixing the medium-temperature heat exchange medium liquid in the output pipeline with the medium-temperature heat exchange medium liquid in the input pipeline to realize circulation.
In the embodiment, the bottom of the flue 2 is provided with a liquid dredging port 4 for discharging condensate generated by the flue gas.
In the present embodiment, a pressure gauge 11 is connected to the vacuum heat exchanger 3 for detecting the degree of vacuum in the vacuum heat exchanger 3.
In this embodiment, the output end of the vacuum pump 5 is provided with an exhaust port 6 for exhausting the air pumped by the vacuum pump 5.
In the present embodiment, the vacuum heat exchanger 3 is a tube heat exchanger or a plate heat exchanger, but in other embodiments, other types of heat exchanger forms may also be applied to the present embodiment, and are not limited herein. The vacuum heat exchanger 3 may be made of stainless steel, which is resistant to high temperature and corrosion.
In this embodiment, the heat exchange medium is water.
Application example
The vacuum integrated heat exchange device for flue gas heat exchange in the flue of the above embodiment is described as an application example below:
the vacuum degree inside the vacuum heat exchanger 3 was reduced to-96.8 kPa by the vacuum pump 5, at which time the boiling point of the heat exchange medium liquid was 30 ℃ and the inlet temperature of the heat exchange medium was set to 33 ℃. The flow of the flue gas is set to 600kg/s, the temperature of the flue gas inlet is set to 100 ℃, the temperature drop of the flue gas is set to 20 ℃, namely the temperature of the flue gas is reduced to 80 ℃, and the heat load generated by the temperature reduction of the flue gas is calculated to be 12480kW. At 33 ℃, the latent heat of evaporation of the heat exchange medium liquid is 2423kJ/kg, and the specific heat of the heat exchange medium liquid is 4.178 kJ/(kg. DEG C).
(1) By adopting a traditional heat exchanger, the inlet temperature of the heat exchange medium is 33 ℃, the temperature rise of the heat exchange medium liquid is set to be 15 ℃, namely the outlet temperature of the heat exchange medium is 48 ℃, and the amount of the heat exchange medium liquid required at the moment is calculated to be 199kg/s =716.4t/h.
(2) The required amount of heat exchange medium liquid was calculated to be 5kg/s =18t/h. Compared with the traditional heat exchanger, the liquid consumption of the heat exchange medium is reduced by 40 times, the reduction amount is 698.4t/h, the annual running time of the unit is calculated according to 5500h, the consumption of cooling water can be reduced by 3,841 and 200t/h in 1 year, and the energy-saving benefit is very obvious.
In the specific heat exchange process, the vacuum pump 5 extracts air in the vacuum heat exchanger 3 and discharges the air from the exhaust port 6, the pressure gauge 11 checks the vacuum degree in the vacuum heat exchanger 3, so that the vacuum heat exchanger 3 is in a vacuum environment, the heat exchange medium pump 9 provides low-temperature heat exchange medium liquid, the low-temperature heat exchange medium liquid flows into a heat exchange medium inlet after the pumping amount of the low-temperature heat exchange medium liquid is regulated by the heat exchange medium valve 10, smoke enters from a flue 2 inlet, the low-temperature heat exchange medium liquid in the vacuum heat exchanger 3 absorbs heat in a high-temperature smoke environment and evaporates into low-temperature heat exchange medium steam, meanwhile, the smoke temperature in the flue 2 is reduced, condensate generated in the flue 2 is discharged from the liquid dredging port 4, and the low-temperature smoke is discharged from a flue 2 outlet; the low-temperature heat exchange medium steam flows into the compressor 7 from the heat exchange medium outlet, the compressor 7 pressurizes the low-temperature heat exchange medium steam to be changed into high-temperature heat exchange medium steam, the high-temperature heat exchange medium steam is output to the liquefier 8, the liquefier 8 liquefies the high-temperature heat exchange medium steam into medium-temperature heat exchange medium liquid, the medium-temperature heat exchange medium liquid has certain heat, the medium-temperature heat exchange medium liquid can be converged into an external heat utilization demand end 13 to realize heat source supply, and can also be converged into the low-temperature heat exchange medium liquid between the heat exchange medium pump 9 and the heat exchange medium valve 10 to be mixed, and recycling is realized. The vacuum integrated heat exchange device improves the efficiency of flue gas heat exchange in the flue 2, reduces the use cost of heat exchange media, and achieves the effects of energy conservation and environmental protection.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.
Claims (10)
1. The utility model provides a vacuum integration heat transfer device for flue gas heat transfer in flue which characterized in that includes: the device comprises a flue, a vacuum heat exchanger, a vacuum pump, a heat exchange medium pump, an input pipeline and an output pipeline;
the vacuum heat exchanger is arranged in the flue;
the vacuum heat exchanger extends out of the flue and is connected with a vacuum pipeline, and the output end of the vacuum pipeline is communicated with the input end of the vacuum pump and is used for forming vacuum in the vacuum heat exchanger; the vacuum heat exchanger is provided with a heat exchange medium inlet and a heat exchange medium outlet;
the input pipeline is provided with the heat exchange medium pump, the input end of the input pipeline is communicated with an external heat exchange medium supply end, and the output end of the input pipeline is communicated with the heat exchange medium inlet;
a compressor and a liquefier are sequentially arranged on the output pipeline; the input end of the output pipeline is communicated with the heat exchange medium outlet, and the output end of the output pipeline is communicated with the input pipeline and/or the external heat demand end;
the heat exchange medium liquid is input into the vacuum heat exchanger through the input pipeline by the heat exchange medium pump, under the vacuum condition, the low-temperature heat exchange medium liquid absorbs heat in the high-temperature flue gas environment in the flue and evaporates into low-temperature heat exchange medium steam, the low-temperature heat exchange medium steam is compressed into high-temperature heat exchange medium steam through the compressor on the output pipeline, and the high-temperature heat exchange medium steam is liquefied into medium-temperature heat exchange medium liquid at the liquefier and then is converged into an external heat utilization demand end.
2. The vacuum integrated heat exchange device of claim 1, wherein: the flue is provided with a flue inlet at one side of the heat exchange medium inlet, and a flue outlet at one side of the heat exchange medium outlet.
3. The vacuum integrated heat exchange device of claim 1, wherein: the input pipeline is provided with a heat exchange medium valve, and the heat exchange medium valve is positioned between the heat exchange medium pump and the heat exchange medium inlet and is used for controlling the flow rate of the heat exchange medium liquid pumped into the heat exchange medium inlet.
4. The vacuum integrated heat exchange device of claim 3, wherein: the input pipeline communicated with the output end of the output pipeline is positioned between the heat exchange medium pump and the heat exchange medium valve.
5. The vacuum integrated heat exchange device of claim 1, wherein: and the bottom of the flue is provided with a liquid dredging port for discharging condensate generated by flue gas.
6. The vacuum integrated heat exchange device of claim 1, wherein: and the vacuum heat exchanger is connected with a pressure gauge for detecting the vacuum degree in the vacuum heat exchanger.
7. The vacuum integrated heat exchange device of claim 1, wherein: and an exhaust port is arranged at the output end of the vacuum pump and used for exhausting the air pumped by the vacuum pump.
8. The vacuum integrated heat exchange device of claim 1, wherein: the vacuum heat exchanger is a tubular heat exchanger or a plate heat exchanger.
9. The vacuum integrated heat exchange device of claim 1, wherein: the vacuum heat exchanger is made of stainless steel.
10. The vacuum integrated heat exchange device of claim 1, wherein: the heat exchange medium is water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223170930.0U CN218672242U (en) | 2022-11-29 | 2022-11-29 | Vacuum integrated heat exchange device for flue gas heat exchange in flue |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223170930.0U CN218672242U (en) | 2022-11-29 | 2022-11-29 | Vacuum integrated heat exchange device for flue gas heat exchange in flue |
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| CN218672242U true CN218672242U (en) | 2023-03-21 |
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| CN202223170930.0U Active CN218672242U (en) | 2022-11-29 | 2022-11-29 | Vacuum integrated heat exchange device for flue gas heat exchange in flue |
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