CN219009962U - Multistage flash distillation degree of depth retrieval and utilization device of dirty waste water waste heat - Google Patents
Multistage flash distillation degree of depth retrieval and utilization device of dirty waste water waste heat Download PDFInfo
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- CN219009962U CN219009962U CN202223495246.XU CN202223495246U CN219009962U CN 219009962 U CN219009962 U CN 219009962U CN 202223495246 U CN202223495246 U CN 202223495246U CN 219009962 U CN219009962 U CN 219009962U
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Abstract
A sewage and waste water waste heat multistage flash evaporation deep recycling device belongs to the technical field of energy conservation and environmental protection. The utility model solves the problem that the existing high-pollution waste water waste heat recovery device can not meet the requirements of heat quality improvement and efficient heat exchange at the same time. The evaporator is internally provided with a second flash evaporation chamber and a condensation evaporation chamber, the second flash evaporation chamber and the condensation evaporation chamber are communicated through the steam channel at the top, the top end of each flash evaporation chamber is communicated with a sewage and waste water inlet pipe, the first flash evaporation chamber and the second flash evaporation chamber are sequentially communicated through the sewage and waste water inlet pipe from top to bottom, when the number of heat exchange devices is two or more, every two adjacent first flash evaporation chambers are communicated through the sewage and waste water inlet pipe, the evaporator and each heat exchange device are connected and provided with a vacuum pump, and heated water sequentially enters the condensation chamber, the absorber and the condenser through pipelines and is discharged after heat exchange.
Description
Technical Field
The utility model relates to a sewage and waste water waste heat multistage flash evaporation deep recycling device, and belongs to the technical field of energy conservation and environmental protection.
Background
At present, a large amount of waste heat of high-pollution waste water is generated in industrial production, but the waste heat cannot be directly used in the traditional dividing wall type heat exchanger because of complex components, serious corrosion and blockage; meanwhile, due to the fact that the thermal quality is medium, if traditional heat pump equipment and the like are adopted for improving the thermal quality, the efficiency is low, and the running cost is high. Based on the two reasons, the waste heat of the high-pollution waste water in the current stage can not meet the requirements of heat quality and efficient heat exchange.
Disclosure of Invention
The utility model aims to solve the problem that the existing high-pollution waste water waste heat recovery device cannot meet the requirements of heat quality improvement and efficient heat exchange at the same time, and further provides a multi-stage flash evaporation deep recycling device for waste water waste heat.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the multi-stage flash evaporation deep recycling device for waste heat of sewage and wastewater comprises at least one heat exchange device and a heat pump which are sequentially arranged from top to bottom,
a first flash evaporation chamber and a condensation chamber are arranged in each heat exchange device, the first flash evaporation chamber and the condensation chamber are communicated through a steam channel at the top,
the heat pump comprises an evaporator, a condenser, an absorber and a generator, wherein a second flash evaporation chamber and a condensing evaporation chamber are arranged in the evaporator, the second flash evaporation chamber and the condensing evaporation chamber are communicated through a steam channel at the top,
the top end of each flash chamber is communicated with a sewage and wastewater inlet pipe, the first flash chambers and the second flash chambers are sequentially communicated with each other through the sewage and wastewater inlet pipes from top to bottom, when the number of the heat exchange devices is two or more, the two adjacent first flash chambers are communicated with each other through the sewage and wastewater inlet pipes, the evaporator and each heat exchange device are connected with a vacuum pump,
the heated water sequentially enters the condensing chamber, the absorber and the condenser through pipelines to exchange heat and then is discharged.
Further, a plurality of heat exchange tubes are arranged in the condensation evaporation chamber, and flash steam of the second flash chamber enters a tube side of the condensation evaporation chamber.
Further, the condenser is communicated with the generator through a steam channel, the lower part of the condenser is connected to the upper part of the condensation evaporation chamber through a refrigerant water pipeline, the condensation evaporation chamber is communicated with the absorber through the steam channel, the lower part of the absorber is connected to the upper part of the generator through a dilute solution pipeline, and the lower part of the generator is connected to the upper part of the absorber through a concentrated solution pipeline.
Further, the concentrated solution pipeline and the dilute solution pipeline are connected through a solution heat exchanger for heat exchange.
Further, a first spraying device is arranged above the heat exchange tubes in the condensation evaporation chamber, and a refrigerant water pipeline is connected to the first spraying device.
Further, a second spraying device is arranged at the upper part of the absorber, and a concentrated solution pipeline is connected to the second spraying device.
Further, the bottom of the second flash chamber is communicated with a sewage and wastewater water-removing pump.
Further, the bottom of the condensation evaporation chamber and the bottom of each condensation chamber are respectively connected with a condensation water pump through pipelines.
Further, the evaporator and each heat exchange device are respectively connected with the same vacuum pump through pipelines.
Further, the number of the vacuum pumps is a plurality, and the vacuum pumps are respectively connected to the evaporator and each heat exchange device in a one-to-one correspondence manner through pipelines.
Compared with the prior art, the utility model has the following effects:
the heated water sequentially enters the condensation chamber, the absorber and the condenser through pipelines to exchange heat and then is discharged, the heat exchange device is used for exchanging heat to realize the early temperature rise of the heated water, and the heat pump is used for realizing the final-stage heat extraction. The number of the heat exchange devices for realizing the early temperature rise can be multiple, preferably two, so that the step heat exchange is further realized.
The multi-stage flash evaporation deep recycling device for the waste heat of the sewage and the waste water can effectively overcome the corrosion and blockage phenomena of the medium-temperature waste liquid, and the waste heat of the high-pollution waste water is recycled in a clean flash evaporation mode, so that hot water with higher heat quality and meeting the process requirements can be produced; meanwhile, gradient and high-efficiency utilization of waste heat can be realized in a multi-effect flash evaporation mode, and compared with the traditional compression heat pump technology, the COP of the heat pump is not lower than 2.4 (the COP of the traditional absorption heat pump is about 1.7), so that the operation cost is greatly reduced.
Drawings
Fig. 1 is a schematic structural diagram of the present application.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1, a sewage and waste heat multistage flash evaporation deep recycling device comprises at least one heat exchange device 1 and a heat pump which are sequentially arranged from top to bottom,
a first flash chamber 1-1 and a condensing chamber 1-2 are arranged in each heat exchange device 1, the first flash chamber 1-1 and the condensing chamber 1-2 are communicated through a steam channel at the top,
the heat pump comprises an evaporator 2, a condenser 3, an absorber 4 and a generator 5, wherein a second flash evaporation chamber 2-1 and a condensation evaporation chamber 2-2 are arranged in the evaporator 2, the second flash evaporation chamber 2-1 and the condensation evaporation chamber 2-2 are communicated through a steam channel at the top,
the top end of each flash evaporation chamber is communicated with a sewage and waste water inlet pipe 6, the first flash evaporation chambers 1-1 and the second flash evaporation chambers 2-1 are sequentially communicated with each other through the sewage and waste water inlet pipe 6 from top to bottom, when the number of the heat exchange devices 1 is two or more, every two adjacent first flash evaporation chambers 1-1 are communicated with each other through the sewage and waste water inlet pipe 6, the evaporator 2 and each heat exchange device 1 are connected with a vacuum pump 7,
the heated water sequentially enters the condensation chamber 1-2, the absorber 4 and the condenser 3 through pipelines to exchange heat and then is discharged.
The heated water sequentially enters the condensation chamber 1-2, the absorber 4 and the condenser 3 through pipelines to exchange heat and then is discharged, the heat exchange device 1 exchanges heat to realize the early temperature rise of the heated water, and the heat pump is used for realizing the final-stage heat extraction. The number of the heat exchange devices 1 for realizing the early temperature rise can be more, preferably two, so that the step heat exchange is further realized.
Every two heat exchange devices 1 adjacent to each other are communicated and arranged through a sewage and waste water inlet pipe 6, sewage and waste water after flash evaporation in the upper heat exchange device 1 enters the lower heat exchange device 1 through the sewage and waste water inlet pipe 6 in the lower heat exchange device 1 to be subjected to lower-level flash evaporation. The sewage and wastewater subjected to flash evaporation by the final-stage heat exchange device 1 enters the evaporator 2 below through the sewage and wastewater inlet pipe 6, and is subjected to flash evaporation in the second flash evaporation chamber 2-1, so that steam is provided for the condensation evaporation chamber 2-2 in the evaporator 2.
The condensing chamber 1-2 is internally provided with a condenser 3 for realizing condensation heat exchange, and the type of the condenser 3 is not limited.
The flash evaporation of the sewage and the wastewater is realized in the flash evaporation chamber through a vacuum environment controlled by a vacuum system.
A demister is arranged in each flash chamber.
The multi-stage flash evaporation deep recycling device for the waste heat of the sewage and the waste water can effectively overcome the corrosion and blockage phenomena of the medium-temperature waste liquid, and the waste heat of the high-pollution waste water is recycled in a clean flash evaporation mode, so that hot water with higher heat quality and meeting the process requirements can be produced; meanwhile, gradient and high-efficiency utilization of waste heat can be realized in a multi-effect flash evaporation mode, and compared with the traditional compression heat pump technology, the COP of the heat pump is not lower than 2.4 (the COP of the traditional absorption heat pump is about 1.7), so that the operation cost is greatly reduced.
A plurality of heat exchange tubes 2-21 are arranged in the condensation and evaporation chamber 2-2, and flash steam of the second flash chamber 2-1 enters a tube side of the condensation and evaporation chamber 2-2. By the design, the waste water is flashed in the second flash chamber 2-1 to provide steam for the condensation evaporation chamber 2-2, and the waste heat of the waste water is utilized in a gradient manner to the greatest extent. The refrigerant water enters the shell side of the condensation-evaporation chamber 2-2 and the generated vapor enters the absorber 4.
The condenser 3 is communicated with the generator 5 through a steam channel, the lower part of the condenser 3 is connected to the upper part of the condensation evaporation chamber 2-2 through a refrigerant water pipeline, the condensation evaporation chamber 2-2 is communicated with the absorber 4 through a steam channel, the lower part of the absorber 4 is connected to the upper part of the generator 5 through a dilute solution pipeline, and the lower part of the generator 5 is connected to the upper part of the absorber 4 through a concentrated solution pipeline. So designed, the steam is driven into the tube side in the generator 5, and the heated water in the condenser 3 and the absorber 4 is driven into the tube side. The other connection components and working principles of the heat pump are the same as those of the heat pump in the prior art, and are not described here again.
The concentrated solution pipeline and the dilute solution pipeline are connected through a solution heat exchanger for heat exchange.
A first spraying device 2-22 is arranged above a plurality of heat exchange tubes 2-21 in the condensation and evaporation chamber 2-2, and a refrigerant water pipeline is connected to the first spraying device 2-22.
The upper part of the absorber 4 is provided with a second spray device 4-1, and a concentrated solution pipeline is connected to the second spray device 4-1.
The bottom of the second flash chamber 2-1 is communicated with a sewage and wastewater water-removing pump 8. So designed, the sewage and wastewater in the evaporator 2 is discharged by arranging the sewage and wastewater water-removing pump 8.
The bottom of the condensation evaporation chamber 2-2 and the bottom of each condensation chamber 1-2 are respectively connected with a condensation water pump 9 through pipelines. So designed, the number of the condensate pumps 9 can be one or more, and when the number of the condensate pumps 9 is one, the condensation evaporation chamber 2-2 and the condensation chamber 1-2 are simultaneously connected to one condensate pump 9; when there are a plurality of condensate pumps 9, the condensation evaporation chamber 2-2 and the condensation chamber 1-2 are connected with one condensate pump 9.
The evaporator 2 and each heat exchange device 1 are respectively connected with the same vacuum pump 7 through pipelines; alternatively, the number of the vacuum pumps 7 is a plurality, and the vacuum pumps 7 are respectively connected to the evaporator 2 and each heat exchange device 1 in a one-to-one correspondence manner through pipelines.
The application adopts the high pollution waste water waste heat that produces in industrial production and the municipal works, and the gradient classification of high pollution waste water waste heat through multistage flash evaporation equipment utilizes the waste heat furthest. Taking three-stage flash evaporation as an example, the main flow is as follows:
1. the high pollution waste water system flow:
1, high-pollution wastewater firstly enters a first flash evaporation chamber 1-1 at the top, flash evaporation is carried out under a vacuum environment controlled by a vacuum pump 7, clean steam is generated as a heat transfer medium, the clean steam enters a first effective condensation chamber 1-2 at the top, heat with relatively high quality is transferred to heated water passing through a second effect through the first effective condensation chamber 1-2, and a high-efficiency and clean heat exchange process is realized;
2, the high-pollution waste water enters a first flash evaporation chamber 1-1 with a second effect below through a waste water channel, the working area is lower than the pressure of the first effect, in the vacuum system, the high-pollution waste water is evaporated again under low pressure, and the heat-carrying clean steam with medium heat quality generated by the high-pollution waste water enters a second effect condensation chamber 1-2 to transfer heat to a low-temperature section of the heated water, so that a high-efficiency and clean heat exchange process is realized;
3, after the second-effect flash evaporation, high-pollution wastewater flows into a second flash evaporation chamber 2-1 positioned below and having three effects through a wastewater channel, flash evaporation occurs in a space with lower pressure, and heat of heat-carrying steam with relatively upper two effects and lower heat quality is transferred to a refrigerant side working medium of a heat quality improving system through the second flash evaporation chamber 2-1;
after the three stages, the high-pollution wastewater returns through the sewage and wastewater water-removing pump 8.
2. The vacuum system flow is as follows: the vacuum pump 7 is arranged on the vacuum main pipe, and the pressure of the triple effect flash evaporation is respectively controlled through three branch pipes;
3. and (3) condensate flow: condensed water generated by the triple-effect condensing system is collected to a condensed water main pipe through three branch pipes and is conveyed out of the system through a condensed water pump 9;
4. the thermal quality improvement system flow:
1 solution system flow: the dilute solution is sprayed into the generator 5, the heat released by the driving steam in the generator 5 is used for generating solution concentration, water in the dilute solution is evaporated to generate the generator 5, the concentrated solution is generated, and the concentrated solution firstly passes through the solution heat exchanger, and part of heat is transferred to the dilute solution side of the solution heat exchanger and then enters the absorber 4. The water absorption characteristic of the concentrated solution is utilized, the concentrated solution absorbs the vaporous refrigerant water from the evaporator 2, the vaporous refrigerant water is condensed and released, the concentrated solution is diluted to generate a dilute solution, the dilute solution firstly enters the solution heat exchanger through the solution circulating pump to absorb heat on the concentrated solution side, and then enters the generator 5 to continue the next circulation;
2 refrigerant water flow path: the vapor evaporated from the generator 5 enters the condenser 3, heat is transferred to the heated water in the condenser 3, after the condensation heat release process, the liquid refrigerant water firstly passes through the throttle valve and then enters the evaporator 2, in the low-temperature and low-pressure environment in the evaporator 2, the heat of the heat-carrying vapor evaporated in the second flash chamber 2-1 is absorbed, the generated gaseous refrigerant water enters the absorber 4 and is absorbed by the concentrated solution in the absorber 4, the liquid refrigerant water is formed and is brought into the dilute solution, and the refrigerant water is brought into the generator 5 to evaporate through the dilute solution, so that the next process is continued;
3, residual hot water flow: the waste heat water enters a second flash evaporation chamber 2-1 in the evaporator 2, and the low-temperature and low-pressure liquid refrigerant water is heated and evaporated and flows out of the system, and the heat of the engineering low-temperature waste heat water is recovered by the system.
4, driving a steam flow: the driving steam enters the generator 5, the dilute solution is heated and evaporated, the dilute solution is concentrated, heat is transferred to the solution and the flash evaporation of the refrigerant steam, and then the condensed water is condensed to be discharged out of the system.
5. Heated water system flow: the heated water firstly absorbs the heat of the heat-carrying flash steam of the second-effect flash evaporation system through the second-effect condensing chamber 1-2 to be primarily heated, then enters the first-effect condensing chamber 1-2 to absorb the heat of the first-effect flash evaporation heat-carrying steam to be heated in the middle preheating section, and then enters the absorber 4 and the condenser 3 in the heat quality improving stage to greatly improve the temperature, and enters the process water system.
The solution of the thermal quality improving system can be LiBr solution and CaCl solution 2 Solutions, and the like.
Claims (10)
1. A sewage waste water waste heat multistage flash distillation degree of depth retrieval and utilization device, its characterized in that: comprises at least one heat exchange device (1) and a heat pump which are sequentially arranged from top to bottom,
a first flash evaporation chamber (1-1) and a condensation chamber (1-2) are arranged in each heat exchange device (1), the first flash evaporation chamber (1-1) and the condensation chamber (1-2) are communicated through a steam channel at the top,
the heat pump comprises an evaporator (2), a condenser (3), an absorber (4) and a generator (5), wherein a second flash evaporation chamber (2-1) and a condensation evaporation chamber (2-2) are arranged in the evaporator (2), the second flash evaporation chamber (2-1) and the condensation evaporation chamber (2-2) are communicated through a steam channel at the top,
the top end of each flash evaporation chamber is communicated with a sewage and wastewater inlet pipe (6), the first flash evaporation chambers (1-1) and the second flash evaporation chambers (2-1) are sequentially communicated with each other through the sewage and wastewater inlet pipe (6) from top to bottom, when the number of the heat exchange devices (1) is two or more, every two adjacent first flash evaporation chambers (1-1) are communicated with each other through the sewage and wastewater inlet pipe (6), the evaporator (2) and each heat exchange device (1) are connected with a vacuum pump (7),
the heated water sequentially enters the condensation chamber (1-2), the absorber (4) and the condenser (3) through pipelines to exchange heat and then is discharged.
2. The sewage and wastewater waste heat multistage flash evaporation deep recycling device according to claim 1, wherein the sewage and wastewater waste heat multistage flash evaporation deep recycling device is characterized in that: a plurality of heat exchange tubes (2-21) are arranged in the condensation evaporation chamber (2-2), and flash steam of the second flash chamber (2-1) enters a tube side of the condensation evaporation chamber (2-2).
3. The sewage and wastewater waste heat multistage flash evaporation deep recycling device according to claim 2, wherein: the condenser (3) is communicated with the generator (5) through a steam channel, the lower part of the condenser (3) is connected to the upper part of the condensation evaporation chamber (2-2) through a refrigerant water pipeline, the condensation evaporation chamber (2-2) is communicated with the absorber (4) through the steam channel, the lower part of the absorber (4) is connected to the upper part of the generator (5) through a dilute solution pipeline, and the lower part of the generator (5) is connected to the upper part of the absorber (4) through a concentrated solution pipeline.
4. The sewage waste heat multistage flash evaporation deep recycling device according to claim 1, 2 or 3, wherein: the concentrated solution pipeline and the dilute solution pipeline are connected through a solution heat exchanger for heat exchange.
5. The sewage and waste water waste heat multistage flash evaporation deep recycling device according to claim 3, wherein: a first spraying device (2-22) is arranged above a plurality of heat exchange tubes (2-21) in the condensation evaporation chamber (2-2), and a refrigerant water pipeline is connected to the first spraying device (2-22).
6. The sewage and waste water waste heat multistage flash evaporation deep recycling device according to claim 3, wherein: the upper part of the absorber (4) is provided with a second spraying device (4-1), and a concentrated solution pipeline is connected to the second spraying device (4-1).
7. The sewage and waste water waste heat multistage flash evaporation deep recycling device according to claim 6, wherein: the bottom of the second flash chamber (2-1) is communicated with a sewage and wastewater water-removing pump (8).
8. The sewage and wastewater waste heat multistage flash evaporation deep recycling device according to claim 1, wherein the sewage and wastewater waste heat multistage flash evaporation deep recycling device is characterized in that: the bottom of the condensation evaporation chamber (2-2) is connected with a condensation water pump (9) through pipelines respectively at the bottom of each condensation chamber (1-2).
9. The sewage and wastewater waste heat multistage flash evaporation deep recycling device according to claim 1, wherein the sewage and wastewater waste heat multistage flash evaporation deep recycling device is characterized in that: the evaporator (2) and each heat exchange device (1) are respectively connected with the same vacuum pump (7) through pipelines.
10. The sewage and wastewater waste heat multistage flash evaporation deep recycling device according to claim 1, wherein the sewage and wastewater waste heat multistage flash evaporation deep recycling device is characterized in that: the number of the vacuum pumps (7) is a plurality, and the vacuum pumps (7) are respectively connected to the evaporator (2) and each heat exchange device (1) in a one-to-one correspondence manner through pipelines.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223495246.XU CN219009962U (en) | 2022-12-27 | 2022-12-27 | Multistage flash distillation degree of depth retrieval and utilization device of dirty waste water waste heat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223495246.XU CN219009962U (en) | 2022-12-27 | 2022-12-27 | Multistage flash distillation degree of depth retrieval and utilization device of dirty waste water waste heat |
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| CN219009962U true CN219009962U (en) | 2023-05-12 |
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| CN202223495246.XU Active CN219009962U (en) | 2022-12-27 | 2022-12-27 | Multistage flash distillation degree of depth retrieval and utilization device of dirty waste water waste heat |
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