CN210463064U - Waste heat recovery device of gas boiler - Google Patents
Waste heat recovery device of gas boiler Download PDFInfo
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- CN210463064U CN210463064U CN201920996888.7U CN201920996888U CN210463064U CN 210463064 U CN210463064 U CN 210463064U CN 201920996888 U CN201920996888 U CN 201920996888U CN 210463064 U CN210463064 U CN 210463064U
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model discloses a gas boiler waste heat recovery device, include: gas boiler, direct contact heat exchanger includes: the gas inlet of the heat exchanger body is connected with the flue gas outlet of the gas-fired boiler through a first flue gas exhaust pipeline; the spraying device is arranged above the spraying liquid inlet; the inlet of the condensate water tank is communicated with the condensate outlet of the heat exchanger main body; the absorption heat pump is provided with a low-temperature heat source inlet and a low-temperature heat source outlet; the low-temperature heat source outlet is connected with a spraying device through a pipeline provided with a circulating water pump; the low-temperature heat source inlet is connected with the condensate outlet of the condensate water tank through a pipeline provided with a circulating water pump. The utility model discloses effectively utilized the low-grade heat in the flue gas waste heat, helped improving the whole heating efficiency of system conscientiously.
Description
Technical Field
The utility model relates to an economizer field, concretely relates to gas boiler waste heat recovery device.
Background
According to statistics, by 2018, the building area of northern towns has increased to 115 hundred million meters2. The energy consumption of Chinese buildings accounts for about 30 percent of the total social energy consumption, and the heating of towns in the north accounts for 25 percent of the total energy consumption of the Chinese buildings. With the further development of urbanization in China, the energy situation in China is more and more severe, and the ecological environment is continuously deteriorated. The energy consumption of the unit area of the heating pair is reduced, the energy utilization efficiency is improved, the method is not only necessary for sustainable development, but also a main way for expanding profits of the vast heat supply enterprises and improving the market competitiveness. The way of improving the energy utilization efficiency of the heating system is 'open source' and 'throttling'. The open source is to find a new heat source, and the throttling is to reduce the heat loss in the heat supply link. An effective mode of 'open source' is to fully excavate the waste heat of the existing heat source and utilize the low-grade heat wasted originally. At present, the exhaust gas temperature of a gas boiler is generally higher than 180 ℃, and not only a part of sensible heat is wasted, but also a large amount of latent heat of water vapor is wasted. If the part of heat can be utilized, the temperature of the exhaust smoke is reduced, and the efficiency of the boiler is greatly improved. A large part of the residual heat in the flue gas exists in the latent heat of the water vapor, so that the latent heat of the water vapor in the flue gas can be recovered to realize the real total heat recovery of the flue gas while the temperature of the flue gas is reduced and sensible heat is recovered. The water vapor of the high-temperature flue gas of the gas-fired boiler is in an unsaturated state, so that the water vapor must be condensed and separated out through temperature reduction. If the water vapour is to be condensed, the flue gas temperature must be lowered below the corresponding dew point temperature. For the flue gas of a natural gas boiler, the dew point temperature is generally 55-60 ℃. Therefore, the flue gas waste heat recovery device is required to have strong heat exchange capacity, and the high-temperature flue gas is reduced to a sufficient temperature, so that water vapor in the flue gas is condensed as much as possible, and latent heat is released. The traditional flue gas waste heat recovery equipment mainly adopts a dividing wall heat exchange mode, and flue gas transfers heat to cold water through a heat exchange pipe wall, so that the water is heated.
The traditional flue gas waste heat recovery equipment mainly adopts a dividing wall heat exchange mode, and flue gas transfers heat to cold water through a heat exchange pipe wall, so that the water is heated. The heat transfer coefficient of the heat exchange mode is very low, and a large number of steel pipe heating surfaces are usually required to be arranged for enhancing the heat transfer effect. On one hand, a large amount of waste water is consumed, so that the volume and the cost of equipment are greatly improved; on the other hand, the smoke discharge resistance of the flue is increased, and the influence on a hot-pressing smoke discharge system is larger.
SUMMERY OF THE UTILITY MODEL
The utility model mainly provides a gas boiler flue gas waste heat recovery technique based on absorption heat pump, it is through effectively combining a direct contact heat exchanger and absorption heat pump, has realized the heat transfer of flue gas direct contact, has effectively utilized the low-grade heat in the flue gas waste heat, helps improving the whole heating efficiency of system conscientiously, reaches reduction in production cost, the purpose that the reduction pollutant discharged.
The utility model provides a pair of gas boiler waste heat recovery device, include:
a gas-fired boiler, which is a boiler,
a direct contact heat exchanger comprising: the gas-liquid heat exchanger comprises a heat exchanger main body, wherein a gas inlet, a condensate outlet, a flue gas outlet and a spraying liquid inlet are formed in the heat exchanger main body, the spraying liquid inlet and the flue gas outlet are arranged at positions higher than the gas inlet and the condensate outlet, and the gas inlet of the heat exchanger main body is connected with the flue gas outlet of the gas-fired boiler through a first flue gas exhaust pipeline; the spraying device is arranged above the spraying liquid inlet; the inlet of the condensate water tank is communicated with the condensate outlet of the heat exchanger main body;
the absorption heat pump is provided with a low-temperature heat source inlet and a low-temperature heat source outlet; the low-temperature heat source outlet is connected with the spraying device through a pipeline provided with a circulating water pump; the low-temperature heat source inlet is connected with the condensate outlet of the condensate water tank through a pipeline provided with a circulating water pump; the absorption heat pump comprises a condenser, a compressor, an evaporator and a throttling device which are connected in sequence, and the throttling device is connected with the condenser to form a heat source fluid loop; the low-temperature heat source inlet is arranged on the evaporator.
According to the preferable technical scheme, the absorption heat pump is a fuel gas absorption heat pump, and a flue gas outlet of the absorption heat pump is connected with a gas inlet of the heat exchanger main body through a second smoke exhaust pipeline.
As a preferred technical scheme, the first smoke exhaust pipeline and the second smoke exhaust pipeline are connected with the gas inlet of the heat exchanger main body after being communicated.
Preferably, the absorption heat pump comprises a condenser, a compressor, an evaporator and a throttling device which are connected in sequence, and the throttling device is connected with the condenser to form a heat source fluid loop.
The low-temperature heat source inlet of the absorption heat pump is arranged on the evaporator, namely, the condensate outlet of the condensate water tank is connected with the evaporator through a pipeline.
As a preferred technical scheme, the direct contact heat exchanger further comprises a main flue connected with the flue gas outlet of the heat exchanger main body.
As a preferred technical scheme, a dehumidifying device is arranged on the main flue.
As a preferred technical scheme, the upper bottom of the heat exchanger main body is provided with a gas inlet and a condensate outlet, and the top of the heat exchanger main body is provided with a flue gas outlet and a spraying liquid inlet.
According to the preferable technical scheme, the return water of the heat supply network is connected with the high-temperature heat source inlet of the absorption heat pump through a pipeline, and the high-temperature heat source outlet of the absorption heat pump is connected with the liquid inlet of the gas boiler.
The utility model discloses a what adopt is a novel direct contact heat exchanger. In this heat exchanger, the flue gas and water no longer flow in separate spaces as in conventional dividing wall heat exchangers, but are in direct contact inside the heat exchanger, transferring heat through the tube walls. The circulating cold water is directly contacted with the flowing high-temperature flue gas in a spraying mode. During the period, the flue gas is cooled and condensed, precipitated condensed water and circulating water fall into a condensation pool of the direct contact type heat exchanger together, and the circulating water pump sends out the heated circulating water in the condensation pool. The heat exchange mode can achieve high heat exchange coefficient. Meanwhile, because the smoke and the water are directly contacted without contacting with a medium, the resistance of the whole heat exchanger is very small. The direct contact type heat exchange of the flue gas is realized, the low-grade heat in the waste heat of the flue gas is effectively utilized, the overall heat supply efficiency of the system is practically improved, and the aims of reducing the production cost and reducing the pollutant emission are fulfilled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a waste heat recovery device of a gas boiler according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a waste heat recovery device of a gas boiler according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments and the corresponding drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, a first embodiment of the present invention provides a gas boiler waste heat recovery device, including:
a gas-fired boiler (1) is provided,
direct contact heat exchanger 2, comprising: the heat exchanger main part 21, the heat exchanger main part 21 bottom is equipped with gas inlet and condensate outlet, and the top is equipped with exhanst gas outlet and sprays the liquid entry. A gas inlet of the heat exchanger main body 21 is connected with a flue gas outlet of the gas boiler 1 through a first flue gas exhaust pipeline 20; the spraying device 22 is arranged above the spraying liquid inlet; a condensate water tank 23, the inlet of which is communicated with the condensate outlet of the heat exchanger main body 21; and a main flue 24 connected with the flue gas outlet of the heat exchanger main body 21, wherein the main flue 24 is provided with a dehumidifying device 240.
The absorption heat pump 3 is provided with a low-temperature heat source inlet and a low-temperature heat source outlet; the low-temperature heat source outlet is connected with the spraying device 22 through a pipeline 30 provided with a circulating water pump; the low-temperature heat source inlet is connected with the condensate outlet of the condensate water tank 23 through a pipeline 40 provided with a circulating water pump. The absorption heat pump 3 includes a condenser 31, a compressor 32, an evaporator 33, and a throttle device 34 connected in series, and the connection of the throttle device 34 with the condenser 31 forms a heat source fluid circuit. The low-temperature heat source inlet of the absorption heat pump 3 is arranged on the evaporator 33, namely, the condensate outlet of the condensate water tank 23 is connected with the evaporator 33 through a pipeline. The heat supply network backwater is connected with a high-temperature heat source inlet of the absorption heat pump through a pipeline, and a high-temperature heat source outlet of the absorption heat pump is connected with a liquid inlet (not shown in the figure) of the gas boiler.
As shown in fig. 2, for the gas boiler waste heat recovery device provided by the second embodiment of the present invention, the structure is similar to that of the first embodiment, and the only difference is that the absorption heat pump 3 is a gas absorption heat pump, the gas outlet of which is communicated with the second smoke exhaust pipe 50, and the first smoke exhaust pipe 20 and the second smoke exhaust pipe 50 are communicated with each other and then connected with the gas inlet of the heat exchanger main body 21.
To further explain the present invention, the following describes the waste heat recovery process of the waste heat recovery device of the gas boiler according to the second embodiment with reference to fig. 2:
the flue gas temperature of the original gas boiler 1 is 110 ℃, the temperature of the flue gas discharged by the absorption heat pump 3 is 150 ℃, and the flue gas are mixed and then enter the direct contact type heat exchanger 2. The temperature of the outlet water of the absorption heat pump 3 is 20 ℃, the outlet water is sent to the upper spraying device 22 after passing through the circulating water pump, and the outlet water is uniformly sprayed into the cavity of the heat exchanger main body 21 through the spray head. The flue gas contacts with cooling water to exchange heat in the direction opposite to the water spraying direction, is cooled and dehumidified to 30 ℃, is discharged back to the main flue 24, and is discharged to the atmosphere through a chimney. The sprayed cooling water is heated to 30 ℃ and collected in the condensate water tank 23 below the heat exchanger body 21, and then pumped back to the evaporator 33 of the absorption heat pump 3 by the circulating water pump. In the absorption heat pump 3, the gas drives the absorption heat pump 3 to operate, the flue gas is mixed with the flue gas of the gas boiler through the flue, the heated circulating cooling water enters the evaporator 33 of the absorption heat pump 3 to be used as a low-temperature heat source of the absorption heat pump 3, and then the cooling water is cooled and sent to the direct contact type heat exchanger 2 to continuously recover the waste heat. So, the heat supply network return water can not directly get into the boiler again, but gets into earlier the utility model discloses a gas boiler waste heat recovery device preheats, and the heat supply network return water gets into the absorption heat pump with this and as the high temperature heat source, is exported after being heated, finally gets into and is heated in the gas boiler.
The embodiments of the present invention are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment is mainly described as different from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. A gas boiler waste heat recovery device, characterized by comprising:
a gas-fired boiler, which is a boiler,
a direct contact heat exchanger comprising: the gas-liquid heat exchanger comprises a heat exchanger main body, wherein a gas inlet, a condensate outlet, a flue gas outlet and a spraying liquid inlet are formed in the heat exchanger main body, the spraying liquid inlet and the flue gas outlet are arranged at positions higher than the gas inlet and the condensate outlet, and the gas inlet of the heat exchanger main body is connected with the flue gas outlet of the gas-fired boiler through a first flue gas exhaust pipeline; the spraying device is arranged above the spraying liquid inlet; the inlet of the condensate water tank is communicated with the condensate outlet of the heat exchanger main body;
the absorption heat pump is provided with a low-temperature heat source inlet and a low-temperature heat source outlet; the low-temperature heat source outlet is connected with the spraying device through a pipeline provided with a circulating water pump; the low-temperature heat source inlet is connected with the condensate outlet of the condensate water tank through a pipeline provided with a circulating water pump; the absorption heat pump comprises a condenser, a compressor, an evaporator and a throttling device which are connected in sequence, and the throttling device is connected with the condenser to form a heat source fluid loop; the low-temperature heat source inlet is arranged on the evaporator.
2. The gas boiler waste heat recovery device of claim 1, wherein the absorption heat pump is a gas absorption heat pump, and a flue gas outlet of the absorption heat pump is connected with a gas inlet of the heat exchanger main body through a second smoke exhaust pipeline.
3. The gas boiler waste heat recovery device of claim 2, wherein the first exhaust flue and the second exhaust flue are connected to a gas inlet of the heat exchanger body after being communicated.
4. The gas boiler waste heat recovery device of claim 1, wherein the direct contact heat exchanger further comprises a main flue connected to the flue gas outlet of the heat exchanger body.
5. The gas boiler waste heat recovery device of claim 4, wherein a dehumidifier is provided on the main flue.
6. The gas boiler waste heat recovery device of claim 5, wherein the heat exchanger body is provided with a gas inlet and a condensate outlet at the bottom, and a flue gas outlet and a spray liquid inlet at the top.
7. The gas boiler waste heat recovery device of claim 1, wherein a heat supply network backwater is connected with a high-temperature heat source inlet of the absorption heat pump through a pipeline, and a high-temperature heat source outlet of the absorption heat pump is connected with a liquid inlet of the gas boiler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920996888.7U CN210463064U (en) | 2019-06-28 | 2019-06-28 | Waste heat recovery device of gas boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920996888.7U CN210463064U (en) | 2019-06-28 | 2019-06-28 | Waste heat recovery device of gas boiler |
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| CN210463064U true CN210463064U (en) | 2020-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879940A (en) * | 2021-02-22 | 2021-06-01 | 西安热工研究院有限公司 | Low-temperature flue gas latent heat recovery and comprehensive utilization system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112879940A (en) * | 2021-02-22 | 2021-06-01 | 西安热工研究院有限公司 | Low-temperature flue gas latent heat recovery and comprehensive utilization system and method |
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