CN111578301A - Flue gas waste heat recovery system - Google Patents
Flue gas waste heat recovery system Download PDFInfo
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- CN111578301A CN111578301A CN201910122946.8A CN201910122946A CN111578301A CN 111578301 A CN111578301 A CN 111578301A CN 201910122946 A CN201910122946 A CN 201910122946A CN 111578301 A CN111578301 A CN 111578301A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
- F24D2200/18—Flue gas recuperation
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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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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a flue gas waste heat recovery system, which comprises: the system comprises a first heat exchanger, a second heat exchanger, a heat pump and a heat supply network pipeline; a first liquid distribution device and a second liquid distribution device are arranged in the first heat exchanger; the bottom of the first heat exchanger is communicated with the input end of the heat-releasing side of the second heat exchanger; the output end of the heat-releasing side of the second heat exchanger is communicated with the first liquid distribution device to form a first fluid circulation loop; the output end of the heat-releasing side of the second heat exchanger is also sequentially communicated with the heat pump and the second liquid distribution device to form a second fluid circulation loop; the heat supply network pipeline comprises a heat supply network water return pipeline and a heat supply network water supply pipeline; the heat supply network pipeline is communicated with the heat absorption side of the second heat exchanger to form a heat supply network circulation loop; and/or the heat supply network pipeline is communicated with the heat absorption side of the second heat exchanger and the heat pump in sequence to form a heat supply network water circulation loop. The device can improve the recovery efficiency of the flue gas waste heat and reduce the investment of heat pump equipment.
Description
Technical Field
The invention relates to the technical field of waste heat recovery, in particular to a flue gas waste heat recovery system.
Background
The natural gas flue gas contains a large amount of water vapor, the condensation heat carried by the water vapor accounts for about 10% of the low-level heating value of the natural gas and is an important factor influencing the utilization efficiency of the natural gas, so that the heat of condensation is recovered, and the heat efficiency of the natural gas can be obviously improved.
The prior art discloses a central heating system (CN102242946B) for recovering flue gas waste heat by using an absorption heat pump, wherein flue gas heat is recovered by combining a flue gas-water direct contact type heat exchanger and the absorption heat pump, the system can obviously reduce the temperature of discharged flue gas, and simultaneously can reduce the concentration of nitrogen oxides in the discharged flue gas to a certain extent. In the system, the flue gas with the temperature of 70-90 ℃ directly enters a flue gas-water direct contact type heat exchanger to exchange heat with low-temperature water (about 10 ℃) prepared by a heat pump, and then heat is extracted by an absorption heat pump to heat water of the heat pump. The temperature difference of the heat exchange end at the high-temperature side of the flue gas is large due to the arrangement, part of high-temperature flue gas heat firstly enters a low-temperature medium and then enters a cycle, and then the heat pump consumes a driving heat source to extract water for a heat network, so that energy waste is caused, and meanwhile, large heat pump equipment investment is caused. In addition, in the cooling process of the flue gas, the specific heat capacity is greatly changed along with the condensation of the water vapor, the specific heat capacity of the spray water is almost unchanged, and if the flow of the spray water is not changed, the two streams of fluid are difficult to effectively match in the aspect of heat exchange temperature difference, and the irreversible heat transfer loss is also large.
Disclosure of Invention
The invention aims to provide a flue gas waste heat recovery system which can reduce the investment of heat pump equipment and improve the flue gas waste heat recovery efficiency.
In order to solve the above problems, the present invention provides a flue gas waste heat recovery system, comprising: the system comprises a first heat exchanger, a second heat exchanger, a heat pump and a heat supply network pipeline; a first liquid distribution device and a second liquid distribution device are arranged in the first heat exchanger; the bottom of the first heat exchanger is communicated with the input end of the heat-releasing side of the second heat exchanger; the output end of the heat-releasing side of the second heat exchanger is communicated with the first liquid distribution device to form a first fluid circulation loop; the output end of the heat-releasing side of the second heat exchanger is also sequentially communicated with the heat pump and the second liquid distribution device to form a second fluid circulation loop; the heat supply network pipeline comprises a heat supply network water return pipeline and a heat supply network water supply pipeline; the heat supply network pipeline is communicated with the heat absorption side of the second heat exchanger to form a heat supply network circulation loop; and/or the heat supply network pipeline is communicated with the heat absorption side of the second heat exchanger and the heat pump in sequence to form a heat supply network water circulation loop.
Furthermore, the number of the heat pumps is N, the number of the liquid distribution devices is N +1, wherein N is more than or equal to 1; the N heat pumps are sequentially communicated, and the output end of the heat-releasing side of the second heat exchanger is communicated with the input end of the first heat pump; the output end of the last heat pump is communicated with the highest liquid distribution device in the first heat exchanger to form an N +1 th fluid circulation loop; the output end of the Mth heat pump is communicated with the M +1 th liquid distribution device to form an M +1 th fluid circulation loop, wherein N is more than M and more than 1.
Further, the heat supply network pipeline is sequentially communicated with the heat absorption side of the second heat exchanger and each heat pump to form a heat supply network water circulation loop; and the output end of the heat absorption side of the second heat exchanger is sequentially communicated with the Nth heat pump and the first heat pump of the N-1 th heat pump … … to form the heat supply network water circulation loop.
Furthermore, the N +1 liquid distribution devices are arranged at equal intervals or arranged at unequal intervals according to different heat exchange requirements.
Further, the flue gas waste heat recovery system further comprises a heater, wherein the heater is arranged on the heat supply network circulation loop and is connected with an external high-temperature heat source, so that the temperature of fluid in the heat supply network circulation loop is increased.
Further, the heat pump is one or more of an absorption heat pump, an electric compression heat pump and an absorption-compression combined heat pump.
Further, the first heat exchanger is one of a spray type cavity structure direct contact type heat exchanger, a tower plate structure direct contact type heat exchanger or a packing type structure direct contact type heat exchanger.
Furthermore, the flue gas waste heat recovery system also comprises a first valve and/or a second valve, one end of the first valve is communicated with the output end of the heat absorption side of the second heat exchanger, and the other end of the first valve is communicated with the inlet of the heat pump; one end of the second valve is communicated with the heat absorption side output end of the second heat exchanger, and the other end of the second valve is communicated with the outlet of the heat pump.
Furthermore, the flue gas waste heat recovery system further comprises a third valve, which is arranged on the second fluid circulation loop and is positioned between the second heat exchanger and the heat pump.
Further, the flue gas waste heat recovery system also comprises an overflow port; the overflow port is arranged on the side surface of the first heat exchanger, the height of the overflow port is lower than that of the flue gas inlet, and the overflow port is used for discharging redundant fluid in the first heat exchanger so that the liquid level of the fluid in the first heat exchanger is lower than that of the flue gas inlet.
The technical scheme of the invention has the following beneficial technical effects:
(1) the second heat exchanger is additionally arranged, so that partial heat of high-temperature fluid and low-temperature fluid circulating in a water circulation loop of a heat supply network can be exchanged before fluid flowing out of the first heat exchanger flows into the heat pump for heat exchange, the heat of the fluid flowing into the heat pump is reduced, the power generated by heat conversion of the heat pump can be reduced, a high-power heat pump can be replaced by a low-power heat pump, and the investment on heat pump equipment is reduced.
(2) A plurality of heat exchange sections are arranged in the first heat exchanger from bottom to top, and the plurality of heat exchange sections have step heat exchange capacity aiming at flue gas with different temperatures by adjusting the temperature and the flow of heat exchange medium water. Specifically, the flue gas flows from bottom to top, and the temperature and the moisture content are gradually reduced; the heat exchange medium water flows from top to bottom, and water with different temperatures is added in sections through the layered liquid distribution device, so that the flow is gradually increased, the temperature is gradually increased, the heat capacities of the flue gas and the water are matched, the irreversible heat transfer loss is reduced, and the flue gas waste heat recovery efficiency is further improved.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a third embodiment of the present invention;
FIG. 4 is a schematic diagram of a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fifth embodiment provided by the present invention.
Reference numerals:
1: a first heat exchanger; 11: a first liquid distribution device; 12: a second liquid distribution device; 13: an overflow port; 2: a second heat exchanger; 3: a heat pump; 4: a heat supply network pipeline; 41: a heat supply network water return pipeline; 42: a heat supply network water supply line; 5: a heater; 6 a: a first valve; 6 b: a second valve; 6 c: a third valve; 7: and (4) warming the user.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of a first embodiment structure provided by the present invention.
As shown in fig. 1, the flue gas waste heat recovery system provided by the present embodiment includes: a first heat exchanger 1, a second heat exchanger 2, a heat pump 3 and a heat network pipeline 4.
The side surface of the bottom of the first heat exchanger 1 is also provided with an overflow port 13, the height of the overflow port 13 is lower than that of the flue gas inlet, water vapor is liquefied and dissolved in medium water in the first heat exchanger 1 in the flue gas heat exchange process, the medium water is gradually increased, and the overflow port 13 discharges excessive medium water in the first heat exchanger 1, so that the liquid level of the medium water in the first heat exchanger 1 is lower than that of the flue gas inlet.
A first liquid distribution device 11 and a second liquid distribution device 12 are arranged in the first heat exchanger 1 from bottom to top at intervals. Wherein, the first liquid distribution device 11 is higher than the flue gas inlet, and the second liquid distribution device 12 is lower than the flue gas outlet. The medium water flowing out of the liquid distribution device flows downwards by means of gravity, and the flue gas and the medium water form countercurrent heat exchange.
The heat supply network pipeline 4 comprises a heat supply network water return pipeline 41 and a heat supply network water supply pipeline 42, and the heat supply network water return pipeline 41 is communicated with the heat absorption side of the second heat exchanger 2, the heat pump 3, the water supply pipeline 42 and the heat user 7 in sequence to form a heat supply network water circulation loop. The heat pump 3 is an absorption heat pump 3.
The second heat exchanger 2 adopts a water-water heat exchanger, the input end of the heat release side of the second heat exchanger 2 is communicated with the bottom of the first heat exchanger 1, and the output end of the heat release side of the second heat exchanger 2 is communicated with the first liquid distribution device 11, so that a first fluid circulation loop is formed. The output end of the heat-releasing side of the second heat exchanger 2 is also sequentially communicated with the heat pump 3 and the second liquid distribution device 12 to form a second fluid circulation loop. The arrangement can ensure that the temperature of the medium water sprayed by the first liquid distribution device 11 is higher than that of the medium water sprayed by the second liquid distribution device 12, so that a high-temperature heat exchange section and a low-temperature heat exchange section with different temperatures are formed, the medium water sprayed from the first liquid distribution device 11 is merged with the medium water sprayed from the second liquid distribution device 12, and therefore the medium water flow of the high-temperature heat exchange section below the first liquid distribution device 11 is also higher than that of the low-temperature heat exchange section between the first liquid distribution device 11 and the second liquid distribution device 12, so that the temperature and the heat capacity of the flue gas and the medium water are matched, namely the temperature of the flue gas is always properly higher than that of the medium water when the flue gas flows through different heat exchange ends, and the irreversible heat loss between the flue gas and the medium water is avoided to.
After entering the first heat exchanger 1, the high-temperature flue gas with the temperature of about 90 ℃ passes through the high-temperature heat exchange section and the low-temperature heat exchange section in sequence to carry out heat exchange twice, and the temperature of the medium water is raised to about 45 ℃ after heat exchange. The temperature of the flue gas at 90 ℃ is reduced to 18 ℃ after the flue gas flows through the high-temperature heat exchange section for heat exchange, and the flue gas is further reduced to 10 ℃ after the flue gas continuously passes through the low-temperature heat exchange section and is discharged into the atmosphere.
After heat exchange, medium water at about 45 ℃ flows out of the first heat exchanger 1, flows into the heat releasing side of the second heat exchanger 2 along the first fluid loop, and meanwhile, low-temperature fluid at 10 ℃ circulating in the return pipe of the heat supply network flows into the heat absorbing side of the second heat exchanger 2 to exchange heat with the medium water at about 45 ℃, after the heat exchange is completed, the medium water at about 45 ℃ is cooled to 13 ℃ and then flows to the first liquid distribution device 11 and the heat pump 3 respectively in two paths.
The heat pump 3 includes an evaporator, a generator, an absorber, and a condenser, wherein the evaporator communicates with the heat-releasing side of the second heat exchanger 2, the absorber and the condenser communicate with the heat-absorbing side of the second heat exchanger 2, and the generator is connected with an external heat source as a driving heat source of the heat pump 3.
Part of 13 ℃ medium water flows into the first heat exchanger 1 after flowing through the first liquid distribution device 11 along the second fluid loop, and flue gas waste heat recovery is carried out at the high-temperature heat exchange section.
The rest medium water with the temperature of 13 ℃ flows into an evaporator of the heat pump 3, the evaporator recovers the heat of the part of medium water to reduce the temperature to 5 ℃, the part of medium water flows into the second liquid distribution device 12 along the first fluid loop to enter the first heat exchanger 1, and the flue gas waste heat is recovered in the low-temperature heat exchange section. The medium water flowing into the first heat exchanger 1 from the first liquid distribution device 11 and the second liquid distribution device 12 finally uniformly flows out of the first heat exchanger 1, and the heat exchange process is repeated.
After heat exchange is completed, the fluid flowing into the heat absorption side of the second heat exchanger 2 at 10 ℃ is heated to 40 ℃, flows into an absorber and a condenser of the heat pump 3, is driven by an external heat source to be further heated to 60 ℃, and is conveyed to the use end of a heat user 7 along a heat network water circulation loop.
And a plurality of water pumps are arranged on the first fluid circulation loop and the second fluid circulation loop and used for driving the medium water to flow. A first valve 6a and a second valve 6b are arranged on the heat supply network water circulation loop, one end of the first valve 6a is communicated with the heat absorption side output end of the second heat exchanger 2, and the other end of the first valve is communicated with the inlet of the heat pump 3; one end of the second valve 6b is communicated with the heat absorption side output end of the second heat exchanger 2, and the other end is communicated with the outlet of the heat pump 3. The first valve 6a and the second valve 6b are used to control whether the medium water circulating in the network water circulation loop passes through the heat pump 3 and is delivered to the user 7. The first valve 6a is closed, the second valve 6b is opened, and the fluid circulating in the heat supply network water circulation loop is directly conveyed to the use end of a user 7; the first valve 6a is opened, the second valve 6b is closed, and the fluid circulating in the heat supply network water circulation loop passes through the heat pump 3, is heated and then is delivered to the use end of the user 7. The arrangement can meet different temperature requirements of users.
And a third valve 6c is arranged on the second fluid circulation loop and between the second heat exchanger 2 and the heat pump 3, a fourth valve is arranged on the first fluid circulation loop and between the second heat exchanger 2 and the first heat exchanger 1, and the third valve 6c and the fourth valve are used for controlling whether the medium water of the circulation loop passes through the corresponding circulation loop or controlling the flow of the medium water passing through the corresponding circulation loop.
Fig. 2 is a schematic diagram of a second embodiment of the present invention.
In a second embodiment, as shown in fig. 2, different from the first embodiment, the flue gas waste heat recovery system provided by this embodiment further includes a heater 5, the heater 5 adopts a steam-water heater 5, and the heater 5 is connected to an external high-temperature heat source. The heater 5 is arranged on the heat supply network circulation loop, and the input end of the heater 5 is communicated with the output end of the heat pump 3, so that the heater 5 can further heat the fluid in the heat supply network circulation loop to 110 ℃, and the requirement of higher fluid temperature of a user is met.
Fig. 3 is a schematic diagram of a third embodiment structure provided by the present invention.
In the third embodiment, as shown in fig. 3, the heat pump 3 is different from the first embodiment in that the electric compression heat pump 3 is used as the heat pump 3, and the electric compression heat pump 3 directly uses electric energy as a driving heat source. The fluid circulating in the heat supply network circulation loop flows through the second heat exchanger 2, is heated and then enters a condenser of the electric compression heat pump 3, and is further heated and then is supplied to a user end. The medium water flowing through the second fluid circulation loop flows into the evaporator of the compression heat pump 3, the temperature is reduced to 5 ℃, and finally the medium water directly contacts with the flue gas in the low-temperature heat exchange section of the first heat exchanger 1 to exchange heat, and the temperature of the flue gas is reduced to 10 ℃ and is discharged.
Fig. 4 is a schematic diagram of a fourth embodiment structure provided by the present invention.
In the fourth embodiment, as shown in fig. 4, different from the first embodiment, two heat pumps 3 are provided, three liquid distribution devices are correspondingly provided in the first heat exchanger 1, and the first heat exchanger 1 is divided into three heat exchange sections. The heat pump 3 adopts a compression-absorption combined heat pump, namely, the first heat pump 3 adopts an absorption heat pump, and the second heat pump 3 adopts an electric compression heat pump. The evaporator of the first heat pump 3 is communicated with the evaporator of the second heat pump 3, the absorber and the condenser of the first heat pump 3 are communicated with the condenser of the second heat pump 3, namely, the two heat pumps 3 are connected in sequence. The output end of the heat-releasing side of the second heat exchanger 2 is communicated with the input end of the evaporator of the first heat pump 3, the output end of the heat-absorbing side of the second heat exchanger 2 is communicated with the input end of the condenser of the second heat pump 3, and the output end of the evaporator of the second heat pump 3 is communicated with the highest third liquid distribution device in the first heat exchanger 1 to form a third fluid circulation loop. And the heat supply network water return pipe is sequentially communicated with the heat absorption side of the second heat exchanger and the two heat pumps 3 to form a heat supply network water circulation loop. After the heat exchange of the second heat exchanger 2, part of the medium water cooled enters the first heat exchanger 1 through the first fluid circulation loop and the first liquid distribution device 11 to recover the waste heat of the flue gas, the rest of the medium water enters the first heat pump 3 to be cooled, part of the medium water cooled enters the first heat exchanger 1 through the second fluid circulation loop and the second liquid distribution device 12 to recover the waste heat of the flue gas, the rest of the medium water cooled enters the second heat pump 3 to be cooled again, and then the medium water cooled enters the first heat exchanger 1 through the third fluid circulation loop and the third liquid distribution device to recover the waste heat of the flue gas. The temperature of the high-temperature flue gas is finally reduced to 10 ℃ and discharged. The heat supply network return pipe fluid flows through the second heat exchanger 2, the first heat pump 3 and the second heat pump 3 in sequence to be heated, and finally flows to a user 7 using end through a heat supply network water supply pipe. The temperature of the medium water flowing out of the first liquid distribution device 11, the second liquid distribution device 12 and the third liquid distribution device is reduced in sequence, and the flow rate is reduced in sequence.
Only a first valve (6a) is arranged on the heat supply network water circulation loop 4 and is used for controlling the fluid of the heat supply network water circulation loop 4 to flow into the second heat pump.
Fig. 5 is a schematic structural diagram of a fifth embodiment provided by the present invention.
In a fifth embodiment, as shown in fig. 5, different from the second embodiment, N heat pumps 3 are provided, N is greater than or equal to 2, N +1 liquid distribution devices are provided in the first heat exchanger 1, so as to form N + 1-stage heat exchange sections, which are 1-stage heat exchange sections, 2-stage … … N-stage heat exchange sections, and N + 1-stage heat exchange sections, the corresponding temperature of the medium water is gradually reduced, the flow rate of the medium water is gradually reduced, the N heat pumps 3 are sequentially communicated, and the output end of the heat-releasing side of the second heat exchanger 2 is communicated with the input end of the first heat pump 3; the output end of the last heat pump 3 is communicated with the highest liquid distribution device in the first heat exchanger 1 to form an N +1 th fluid circulation loop; the output end of the Mth heat pump 3 is communicated with the Mth +1 liquid distribution device to form an Mth +1 fluid circulation loop, wherein N is more than M and more than 1. The heat supply network water return pipeline 41 is sequentially communicated with the heat absorption side of the second heat exchanger 2, the N heat pumps 3, the heat supply network water supply pipeline 42 and the heat users 7 to form a heat supply network water circulation loop; wherein, the output end of the heat absorption side of the second heat exchanger 2 is communicated with the Nth heat pump 3 and the first heat pump 3 of the Nth-1 st heat pump 3 … … in turn to form a heat network water circulation loop. The N +1 liquid distribution devices can be arranged equidistantly or arranged non-equidistantly according to different heat exchange requirements.
It should be noted that, in the above embodiment, a plurality of heat pumps 3 are provided, and the heat pump 3 may be one or more selected from an absorption heat pump, an electric compression heat pump and an absorption-compression combined heat pump.
The first heat exchanger 1 is one of a spray type cavity structure direct contact type heat exchanger, a tower plate structure direct contact type heat exchanger or a packing type structure direct contact type heat exchanger.
The technical scheme of the invention has the following beneficial technical effects:
(1) the second heat exchanger is additionally arranged, so that partial heat of high-temperature medium water and low-temperature fluid circulating in a water circulation loop of a heat supply network can be exchanged before medium water flowing out of the first heat exchanger flows into the heat pump for heat exchange, the medium water heat flowing into the heat pump is reduced, the power generated by heat converted by the heat pump can be reduced, a high-power heat pump can be replaced by a low-power heat pump, and the investment on heat pump equipment is reduced.
(2) A plurality of heat exchange sections are arranged in the first heat exchanger from bottom to top, and the plurality of heat exchange sections have step heat exchange capacity aiming at flue gas with different temperatures by adjusting the temperature and the flow of heat exchange medium water. Specifically, the flue gas flows from bottom to top, and the temperature and the moisture content are gradually reduced; the heat exchange medium water flows from top to bottom, and water with different temperatures is added in sections through the layered liquid distribution device, so that the flow is gradually increased, the temperature is gradually increased, the heat capacities of the flue gas and the water are matched, the irreversible heat transfer loss is reduced, and the flue gas waste heat recovery efficiency is further improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. The utility model provides a flue gas waste heat recovery system which characterized in that includes: the heat pump system comprises a first heat exchanger (1), a second heat exchanger (2), a heat pump (3) and a heat supply network pipeline (4);
a first liquid distribution device (11) and a second liquid distribution device (12) are arranged in the first heat exchanger (1);
the bottom of the first heat exchanger (1) is communicated with the input end of the heat-releasing side of the second heat exchanger (2); the output end of the heat-releasing side of the second heat exchanger (2) is communicated with the first liquid distribution device (11) to form a first fluid circulation loop;
the output end of the heat-releasing side of the second heat exchanger (2) is also sequentially communicated with the heat pump (3) and the second liquid distribution device (12) to form a second fluid circulation loop;
the heat supply network pipeline (4) comprises a heat supply network water return pipeline (41) and a heat supply network water supply pipeline (42);
the heat supply network pipeline (4) is communicated with the heat absorption side of the second heat exchanger (2) to form a heat supply network circulation loop; and/or the presence of a gas in the gas,
and the heat supply network pipeline (4) is sequentially communicated with the heat absorption side of the second heat exchanger (2) and the heat pump (3) to form a heat supply network water circulation loop.
2. The flue gas waste heat recovery system according to claim 1,
the number of the heat pumps (3) is N, the number of the liquid distribution devices is N +1, wherein N is more than or equal to 1; n heat pumps (3) are communicated in sequence,
the output end of the heat-releasing side of the second heat exchanger (2) is communicated with the input end of the first heat pump (3);
the output end of the last heat pump (3) is communicated with the highest liquid distribution device in the first heat exchanger (1) to form an N +1 th fluid circulation loop;
the output end of the Mth heat pump (3) is communicated with the Mth +1 liquid distribution device to form an Mth +1 fluid circulation loop, wherein N is more than M and more than 1.
3. The flue gas waste heat recovery system according to claim 2,
the heat supply network pipeline (4) is sequentially communicated with the heat absorption side of the second heat exchanger (2) and the N heat pumps (3) to form a heat supply network water circulation loop;
the heat-absorbing side output end of the second heat exchanger (2) is sequentially communicated with the Nth heat pump (3) and the first heat pump (3) of the Nth-1 st heat pump (3) … … to form the heat supply network water circulation loop.
4. The flue gas waste heat recovery system according to claim 2,
the N +1 sprayers are arranged at equal intervals.
5. The flue gas waste heat recovery system according to claim 1, further comprising a heater (5),
the heater (5) is arranged on the heat supply network circulation loop, and the heater (5) is connected with an external high-temperature heat source to heat the fluid in the heat supply network circulation loop.
6. The flue gas waste heat recovery system according to claim 1, wherein the heat pump (3) is one or more of an absorption heat pump, an electric compression heat pump and an absorption-compression combined heat pump.
7. The flue gas waste heat recovery system according to claim 1,
the first heat exchanger (1) is one of a spray type cavity structure direct contact type heat exchanger, a tower plate type structure direct contact type heat exchanger or a packing type structure direct contact type heat exchanger.
8. The flue gas waste heat recovery system according to claim 1, further comprising a first valve (6a) and/or a second valve (6b),
one end of the first valve (6a) is communicated with the heat absorption side output end of the second heat exchanger (2), and the other end of the first valve is communicated with the inlet of the heat pump (3);
one end of the second valve (6b) is communicated with the heat absorption side output end of the second heat exchanger (2), and the other end of the second valve is communicated with the outlet of the heat pump (3).
9. The flue gas waste heat recovery system according to claim 1, further comprising a third valve (6c) disposed on the second fluid circulation loop and between the second heat exchanger (2) and the heat pump (3).
10. The flue gas waste heat recovery system according to claim 4, further comprising an overflow port (13);
the overflow port (13) is arranged on the side surface of the first heat exchanger (1), the height of the overflow port (13) is lower than that of the flue gas inlet, and the overflow port is used for discharging redundant fluid in the first heat exchanger (1) so that the fluid level in the first heat exchanger (1) is lower than that of the flue gas inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910122946.8A CN111578301B (en) | 2019-02-19 | 2019-02-19 | Flue gas waste heat recovery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910122946.8A CN111578301B (en) | 2019-02-19 | 2019-02-19 | Flue gas waste heat recovery system |
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| CN111578301A true CN111578301A (en) | 2020-08-25 |
| CN111578301B CN111578301B (en) | 2022-08-09 |
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| DE3216561A1 (en) * | 1982-03-16 | 1983-09-29 | Feraton Anstalt, 9494 Schaan | METHOD FOR PURIFYING EXHAUST GAS AND FOR RECOVERING HEAT AND DEVICE FOR CARRYING OUT THE METHOD |
| US20130098096A1 (en) * | 2010-07-15 | 2013-04-25 | Daikin Industries Ltd | Heat pump system |
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