CN218626800U - Low-grade flue gas waste heat recovery system - Google Patents
Low-grade flue gas waste heat recovery system Download PDFInfo
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- CN218626800U CN218626800U CN202223037428.2U CN202223037428U CN218626800U CN 218626800 U CN218626800 U CN 218626800U CN 202223037428 U CN202223037428 U CN 202223037428U CN 218626800 U CN218626800 U CN 218626800U
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- 238000011084 recovery Methods 0.000 title claims abstract description 64
- 239000002918 waste heat Substances 0.000 title claims abstract description 41
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000003546 flue gas Substances 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 80
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 16
- 230000023556 desulfurization Effects 0.000 claims abstract description 16
- 238000012546 transfer Methods 0.000 claims abstract description 11
- 238000010612 desalination reaction Methods 0.000 claims description 19
- 230000002209 hydrophobic effect Effects 0.000 claims description 16
- 238000004064 recycling Methods 0.000 claims description 13
- 238000011033 desalting Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims description 3
- 230000003009 desulfurizing effect Effects 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 238000010992 reflux Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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Abstract
The utility model relates to a boiler thermodynamic system equipment field, concretely relates to low-grade flue gas waste heat recovery system, including the heat transfer module and the recovery module that communicate each other, heat transfer module with it is connected with desulfurizing tower and oxygen-eliminating device respectively and retrieves system's waste heat with the circulation circuit that forms three cooperations, heat transfer module includes heat exchanger and circulation tank, the heat exchanger receives respectively and comes from the desulfurization wash water of desulfurizing tower with retrieve the circulating water of module, it includes the heat pump to retrieve the module, the heat pump receive respectively steam with circulating water after the heat transfer is handled in the heat exchanger and utilize the two to heat the demineralized water, and desulfurization wash water after handling and demineralized water continue to put into use in the boiler system through the pipeline reflux. The utility model provides a waste heat recovery system has effectively improved flue gas waste heat recovery rate, thereby still can effectively alleviate the corrosion of each device part in the system and prolong boiler system's life.
Description
Technical Field
The utility model relates to a boiler thermodynamic system equipment field, concretely relates to low-grade flue gas waste heat recovery system.
Background
With the continuous improvement of the requirements of China on the emission of atmospheric pollutants, the environmental protection treatment technology of related industries is also continuously developed. In the power industry, the thermal efficiency of a conventional power plant boiler is about 80%, when the temperature of exhaust gas is 140 ℃, the loss of the exhaust gas is about 8%, and a large part of heat in the exhaust gas cannot be utilized. In order to respond to the call for environmental protection, the power plants in China mostly adopt an environmental protection treatment new technology and a new process, namely a low-low temperature economizer system, to recover waste heat by using the basis of foreign advanced technologies and combining the actual situation of the coal-fired power plants in China. In practical application, the low-temperature economizer system is combined with an electric dust removal technology, the temperature of flue gas at the inlet of the electric dust remover is reduced to be lower than the dew point temperature, the dust removal efficiency is greatly improved, and SO is efficiently captured 3 PM2.5 emission is reduced, so that the power plant is ensured to meet the emission requirement of atmospheric pollutants; meanwhile, the low-temperature economizer can also recycle the recovered waste heat to a flue gas heater at the desulfurization island, so that the clean flue gas temperature at the desulfurization outlet is raised to be higher than the safe temperature, and the ash flying phenomenon formed in the discharging process of the flue gas which cannot be quickly dissipated due to lower discharging temperature is reduced.
The low-temperature economizer system achieves better effects in the aspects of energy conservation and emission reduction, but the technical scheme still has the parts to be improved or the defects, such as: the low-temperature economizer system has limited recovery of waste heat, and the recovery efficiency of the boiler waste heat needs to be further improved; the flue gas contains corrosive gas, the temperature of the flue gas passing through the low-temperature flue gas heat exchanger is below an acid dew point, a dust remover, a flue, a fan and the like are corroded, the low-temperature economizer has a serious corrosion phenomenon after being operated for a long time, and the low-temperature economizer needs to be replaced after being used for about three years conventionally. Therefore, the problem of how to prolong the service life of the waste heat recovery system while improving the waste heat recovery rate of the boiler still needs to be solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low-grade flue gas waste heat recovery device for adopt low temperature economizer waste heat recovery rate to hang down among the solution prior art, boiler plant is easily by the technical problem who corrodes, in order to reach the technological effect who improves boiler waste heat recovery rate, extension boiler system life.
In order to achieve the above object, the utility model provides a following scheme:
a low-grade flue gas waste heat recovery system comprises: the heat exchange module and the recovery module are respectively connected with the desulfurizing tower and the deaerator;
the heat exchange module comprises a heat exchanger and a circulating water tank, the heat exchanger comprises a first heat exchange part and a second heat exchange part, a receiving end and an output end on the first heat exchange part of the heat exchanger are respectively connected with the desulfurizing tower and the circulating water tank, a receiving end and an output end on the second heat exchange part of the heat exchanger are connected with the recovery module, and an output end of the circulating water tank is connected with the desulfurizing tower;
retrieve the module including the heat pump that is provided with first heat supply portion, second heat supply portion and heat absorption portion, first heat supply portion receiving terminal and output are connected with female pipe of steam and hydrophobic pipeline respectively, second heat supply portion receiving terminal and output pass through circulating line respectively with the output and the receiving terminal of second heat transfer portion are connected, heat absorption portion receiving terminal and delivery end are connected with first desalination respectively and intake female pipe and the female pipe of second desalination, the female pipe of second desalination is intake and is connected with the oxygen-eliminating device.
Further, the recovery system comprises a monitoring module, the monitoring module comprises a plurality of flowmeters, and the flowmeters are arranged on any pipeline through which gas phase/liquid phase flows before and/or after the heat pump treatment.
Further, the recycling module comprises a circulating pump, and the circulating pump is arranged on a pipeline connecting the second heat exchanging part and the second heat supplying part.
Furthermore, a constant-pressure water supplementing device is arranged on the circulating water pipe, and a receiving end of the constant-pressure water supplementing device is connected with a third desalting water inlet main pipe.
Furthermore, the recovery module comprises a hydrophobic recovery unit, and the hydrophobic recovery unit comprises a hydrophobic valve, a hydrophobic tank and a hydrophobic pump which are sequentially arranged on the hydrophobic pipeline.
Further, the output end of the drainage recovery unit is connected with the deaerator.
Furthermore, a water quality detector for detecting circulating media in the first heat exchange part and the second heat exchange part of the heat exchanger is arranged in the heat exchanger.
Furthermore, a pipeline pressure stabilizing pump is arranged on the second desalting water inlet main pipe.
Further, the heat exchanger is a plate heat exchanger.
Further, be provided with bypass and control system on the first demineralized water female pipe of intaking, the bypass is connected the second demineralized water female pipe of intaking, control system control the bypass switches first demineralized water female pipe of intaking is connected the heat pump or the second demineralized water female pipe of intaking.
Has the advantages that:
according to the technical scheme provided by the utility model, the utility model discloses a low-grade flue gas waste heat recovery system is provided, this system retrieves the flue gas waste heat in the ammonia process wet-type desulfurizing tower through heat transfer module and recovery module, flue gas waste heat recovery rate has effectively been improved, each water of monitoring system at any time is assisted with the monitoring module simultaneously, the vapor flow is in order to ensure the steady operation of system, the corrosion phenomenon of each device part in the system can effectively be alleviated to this scheme simultaneously, boiler flue system's life has effectively been prolonged, energy saving and emission reduction to the power plant, sustainable development has the profound meaning.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of the present disclosure unless such concepts are mutually inconsistent.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the specific embodiments in accordance with the teachings of the present invention.
Drawings
The figures are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a recovery system in an embodiment of the present application.
In the figures, the meaning of the reference numerals is as follows:
1. a heat exchanger; 2. a circulating water tank; 3. a heat pump; 4. a steam main pipe; 5. a drain pipe; 6. a circulating pipeline; 7. a first desalting water inlet main pipe; 8. a second desalting water inlet main pipe; 9. a third desalting water inlet main pipe; 10. a pipeline pressure stabilizing pump; 11. a flow meter; 12. a circulation pump; 13. a constant pressure water replenishing device; 14. a drain valve; 15. a drain tank; 16. a drain pump; 17. a water quality detector.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the embodiments of the present invention will be combined with the following, which is to clearly and completely describe the technical solution of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The embodiment provides a low-grade flue gas waste heat recovery system comprising a heat exchange module and a recovery module, and compared with a low-temperature economizer adopted in a conventional means, the system recovers the flue gas waste heat of a boiler through the mutual cooperation of all parts between the heat exchange module and the recovery module, the flue gas waste heat recovery rate is effectively improved, and the system has no negative effects such as corrosion on all parts of the boiler system, so that the service life of the boiler system is effectively prolonged.
Based on the basic concept, the components involved in this embodiment include the heat exchange module and the recovery module shown in fig. 1, and the heat exchange module and the recovery module are respectively connected with various parts of the boiler system, such as a desulfurizing tower, a deaerator, and the like, to form different circulation loops, thereby realizing waste heat recovery.
The heat exchange module comprises a heat exchanger 1 and a circulating water tank 2, the heat exchanger 1 comprises a first heat exchange part and a second heat exchange part, a receiving end and an output end of the first heat exchange part are respectively connected with a desulfurization tower output end and a circulating water tank 2 receiving end, and the output end of the circulating water tank 2 is connected with the desulfurization tower receiving end;
retrieve the module, retrieve the module including the heat pump 3 that is provided with first heat supply portion, second heat supply portion and heat absorption portion, first heat supply portion receiving terminal and output are connected with female pipe 4 of steam and hydrophobic pipeline 5 respectively, second heat supply portion receiving terminal and output pass through circulating line 6 respectively with the output and the receiving terminal of second heat transfer portion are connected, heat absorption portion receiving terminal and delivery end are connected with first desalination respectively and intake female pipe 7 and the female pipe 8 of second desalination, the female pipe 8 of second desalination intake is connected with the oxygen-eliminating device.
Through the low-grade flue gas waste heat recovery system arranged in the boiler system, the heat exchange module and the recovery module in the recovery system are respectively connected with the desulfurizing tower and the deaerator in the boiler system, so that three circulation loops are respectively formed in the boiler system and the flue gas waste heat recovery system to improve the flue gas waste heat recovery rate.
One of the three circulation loops is a circulation loop for reducing the salt content of the desulfurization washing water, the circulation loop is formed by the desulfurization tower, the heat exchanger 1 and the circulation water tank 2, the desulfurization washing water from the desulfurization tower and the circulation water from the recovery module respectively enter the heat exchanger 1 through a first heat exchange part receiving end and a second heat exchange part receiving end on the heat exchanger 1 for heat exchange treatment, and are respectively conveyed to the circulation water tank 2 and the recovery module, wherein the circulation path of the desulfurization washing water in the circulation loop specifically comprises: and the backwater of the demister at the upper part of the desulfurizing tower is conveyed to the first heat exchange part of the heat exchanger 1 through a pipeline, meanwhile, the second heat exchange part of the heat exchanger 1 receives the circulating water from the heat pump 3 in the recovery module through the circulating pipeline 6, and the desulfurizing and flushing water and the circulating water collected in the heat exchanger 1 exchange heat through the first heat exchange part and the second heat exchange part which are used for heat exchange. Taking the desulfurization flushing water with the water temperature of 43 ℃ and the circulating water with the water temperature of 32 ℃ before entering the heat exchanger 1 as examples, the water temperatures of the desulfurization flushing water and the circulating water after the heat exchange treatment by the heat exchanger 1 are 34.4 ℃ and 38 ℃ respectively. And after heat exchange treatment is carried out on washing water by the heat exchanger 1, the washing water is conveyed into the circulating water tank 2, and is dispatched by the circulating water tank 2 so as to be continuously fed into a boiler system for the next circulation. In this embodiment, the heat exchanger 1 is a plate heat exchanger having the advantages of high heat exchange efficiency, low heat loss, long service life, and the like. In practical use, the heat exchanger 1 is not limited to a plate heat exchanger, and those skilled in the art can select other types of heat exchangers such as a shell-and-tube heat exchanger, a jacketed heat exchanger, a double-tube plate heat exchanger, and the like according to actual requirements and implementation sites and other conditions.
And the second circulation loop is a closed circulation loop formed by the heat exchanger 1 and the heat pump 3, circulating water circulates and reciprocates between the heat exchanger 1 and the heat pump 3 through the circulation loop to recover waste heat, the circulating water with the temperature of 38 ℃ is subjected to heat exchange treatment in the heat exchanger 1 by taking the change of the temperature of the circulating water in the second circulation loop as an example in combination with the middle circulation loop, the circulating water with the temperature of 32 ℃ after the waste heat recovery is returned to the heat pump 3 through the circulation pipeline 6 to recover the waste heat, and the circulating water with the temperature of 32 ℃ after the waste heat recovery is conveyed to the heat exchanger 1 through the circulation pipeline 6 again to perform the next circulation.
Its third of circulation circuit is by heat pump 3 with the circulation circuit that the oxygen-eliminating device formed, heat pump 3 receives the warp the circulating water after heat exchanger 1 carries out the heat transfer and handles, and with it and come from the steam of the female pipe of steam 4 heats jointly and comes from the first demineralized water of intaking female pipe 7, warp steam condensate water and demineralized water after the heat pump 3 handles pass through respectively hydrophobic pipeline 5 with the second demineralized water is intake female pipe 8 and is carried/flow back to boiler system in, the circulating water carries extremely carry out next circulation in the heat transfer module. Compared with the conventional waste heat recovery means such as a low-temperature economizer, the demineralized water which is heated and conveyed to the deaerator through the second demineralized water inlet main pipe 8 consumes less heat source to carry out heating treatment, and the use requirement of the deaerator in the conventional boiler power generation system can be met.
Through the cooperation of the three circulation loops, the flue gas waste heat in the ammonia wet desulfurization tower is recovered, so that the higher flue gas waste heat recovery rate of the lower low-temperature economizer is achieved. In addition, the temperature of the flue gas subjected to waste heat recovery by the system is above the acid dew point temperature, and the flue gas has no corrosive influence on all parts of the boiler system in the emission process, so that the boiler system has longer service life compared with a conventional boiler system with three years and one time change, and plays a positive role in energy conservation, emission reduction and economic benefit improvement. It should be noted that the specific temperature in the above three circulation loops is only used as a reference for the waste heat recovery effect, and in practical implementation, the temperature in the circulation loop in the system is allowed to vary within a certain range.
In order to master the operation status of the system at any time, the low-grade flue gas waste heat recovery system in this embodiment further includes a monitoring module, where the monitoring module includes a plurality of flow meters 11 for monitoring the flow rate of each pipeline, and the flow meters 11 are disposed on any pipeline through which a gas phase/liquid phase flows before and/or after being processed by the heat pump 3. In practical use, the flow meter 11 is not limited to be installed in the above-mentioned pipeline, and a person skilled in the art can determine the flow meter 11 and its installation position according to the actual conditions and actual requirements of the system.
In this embodiment, the recycling module includes circulating pump 12, circulating pump 12 set up in connecting the second heat transfer portion with on the pipeline of second heat supply portion, still include level pressure moisturizing device 13, level pressure moisturizing device 13 set up in on the circulating line 6, its receiving terminal is connected with the third demineralized mother pipe of intaking 9. The circulating pump 12 and the constant pressure water replenishing device 13 are respectively used for overcoming the pressure drop in the closed circulating loop where the circulating pump is located and for replenishing the pressure drop caused by the resistance of the pipeline equipment, and the circulating pump 12 and the constant pressure water replenishing device are cooperatively matched to jointly ensure the stable operation of the circulating loop. In addition, a water quality detector 17 for detecting circulating media in the first heat exchanging part and the second heat exchanging part is further arranged in the heat exchanger 1, and the water quality detector 17 is used for detecting the water quality of each water path in each circulation loop of the heat exchanger 1. As shown in fig. 1, a pipeline pressure stabilizing pump 10 is further arranged on the second desalting water inlet main pipe 8, and the pipeline pressure stabilizing pump 10 is used for controlling the conveying pressure when the desalted water is conveyed to the deaerator in the boiler system through the second desalting water inlet main pipe 8 after being heated by the heat pump 3.
In the third circulation loop, the steam in the steam main pipe 4 absorbs heat by the heat pump 3 to form steam condensate, the steam condensate is conveyed by the drain pipe 5, in order to ensure smooth conveyance of the steam condensate and thus ensure stable operation of the heat pump 3 and the circulation loops connected with the heat pump 3, a drain recovery unit for processing the steam condensate is arranged on the recovery module, and the drain recovery unit comprises a drain valve 14, a drain tank 15 and a drain pump 16 which are sequentially arranged on the drain pipe 5, and the steam condensate is conveyed by the parts to be processed later. The subsequent treatment of the steam condensate water comprises direct discharge or recycling, and the specific treatment mode can be determined according to the actual demand of the power plant. In this embodiment, the drainage pipeline 5 is connected with the deaerator and conveys steam condensate to the deaerator through cooperation with each part of the drainage recovery unit, so that the recovery utilization rate of the low-grade flue gas waste heat recovery system to energy is further improved.
After a period of use, flue gas waste heat recovery system need carry out the periodic overhaul maintenance or the system breaks down and need salvage, in this embodiment, be provided with bypass and control system on the first desalination female pipe of intaking 7, the bypass is connected the second desalination female pipe of intaking 8, control system control the bypass switches first desalination female pipe of intaking 7 is connected heat pump 3 or when the second desalination female pipe of intaking 8, the waste heat recovery system of appearing need overhaul or salvage the circumstances such as, control system control first desalination female pipe of intaking 7 from with heat pump 3 connect switch to with second desalination female pipe of intaking 8 is connected to can overhaul recovery system alone, do not influence the normal operating of other each parts of boiler system.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The present invention is well known in the art and can be modified and decorated without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention is subject to the claims.
Claims (10)
1. A low-grade flue gas waste heat recovery system is characterized by comprising: the heat exchange module and the recovery module;
the heat exchange module comprises a heat exchanger (1) and a circulating water tank (2), the heat exchanger (1) comprises a first heat exchange part and a second heat exchange part, a receiving end and an output end on the first heat exchange part are respectively connected with a desulfurization tower output end and a circulating water tank (2) receiving end, and the output end of the circulating water tank (2) is connected with the desulfurization tower receiving end;
retrieve module is including heat pump (3) that is provided with first heat supply portion, second heat supply portion and heat absorption portion, first heat supply portion receiving terminal and output are connected with female pipe of steam (4) and hydrophobic pipeline (5) respectively, second heat supply portion receiving terminal and output pass through circulating line (6) respectively with the output and the receiving terminal of second heat transfer portion are connected, heat absorption portion receiving terminal and delivery end are connected with first desalination female pipe of intaking (7) and second desalination female pipe of intaking (8) respectively, second desalination female pipe of intaking (8) are connected with the oxygen-eliminating device.
2. A recycling system according to claim 1, characterized in that: the recovery system comprises a monitoring module, the monitoring module comprises a plurality of flow meters (11), and the flow meters (11) are arranged on any pipeline through which gas phase/liquid phase flows before and/or after treatment of the heat pump (3).
3. A recycling system according to claim 1, characterized in that: the recycling module comprises a circulating pump (12), and the circulating pump (12) is arranged on a pipeline connecting the second heat exchanging part and the second heat supply part.
4. A recycling system according to claim 1, characterized in that: the circulating pipeline is provided with a constant-pressure water supplementing device (13), and the receiving end of the constant-pressure water supplementing device (13) is connected with a third desalting water inlet main pipe (9).
5. A recycling system according to claim 1, characterized in that: the recovery module comprises a hydrophobic recovery unit, wherein the hydrophobic recovery unit comprises a hydrophobic valve (14), a hydrophobic tank (15) and a hydrophobic pump (16) which are sequentially arranged on the hydrophobic pipeline.
6. A recycling system according to claim 5, characterized in that: the output end of the drainage recovery unit is connected with the deaerator.
7. A recycling system according to claim 1, characterized in that: and a water quality detector (17) for detecting circulating media in the first heat exchange part and the second heat exchange part is arranged in the heat exchanger (1).
8. A recycling system according to claim 1, characterized in that: and a pipeline pressure stabilizing pump (10) is arranged on the second desalting water inlet main pipe (8).
9. A recycling system according to claim 1, characterized in that: the heat exchanger (1) is a plate heat exchanger (1).
10. A recycling system according to claim 1, characterized in that: first desalination is provided with bypass and control system on female pipe (7) of intaking, the bypass is connected female pipe (8) of intaking of second desalination, control system control the bypass switches female pipe (7) of intaking of first desalination is connected heat pump (3) or female pipe (8) of intaking of second desalination.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223037428.2U CN218626800U (en) | 2022-11-15 | 2022-11-15 | Low-grade flue gas waste heat recovery system |
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| CN202223037428.2U CN218626800U (en) | 2022-11-15 | 2022-11-15 | Low-grade flue gas waste heat recovery system |
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