CN219083863U - Waste water waste heat cascade recovery system - Google Patents
Waste water waste heat cascade recovery system Download PDFInfo
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- CN219083863U CN219083863U CN202223493940.8U CN202223493940U CN219083863U CN 219083863 U CN219083863 U CN 219083863U CN 202223493940 U CN202223493940 U CN 202223493940U CN 219083863 U CN219083863 U CN 219083863U
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Abstract
A waste water waste heat cascade recovery system belongs to the technical field of energy conservation and environmental protection. The utility model solves the problem of low recovery efficiency of the existing direct heating machine to the waste heat of the low-temperature sewage and wastewater. The shell side of the condenser is communicated with a vacuum pump and a condensate outlet pipe, a first sewage liquid inlet is formed in the upper portion of the flash evaporator, a first sewage liquid outlet is formed in the lower portion of the flash evaporator, a second sewage liquid inlet, a second sewage liquid outlet, a first water inlet to be heated and a first water outlet to be heated are formed in the sewage heat exchanger, a second water inlet to be heated and a second water outlet to be heated are formed in the tube side of the condenser, a steam outlet of the flash evaporator is communicated with the shell side of the condenser through a steam channel, the first sewage liquid outlet is communicated to the second sewage liquid inlet through a sewage liquid outlet pipe, and a water return pump is arranged on the sewage liquid outlet pipe. According to the difference of dirty waste water temperature, the waste heat of dirty waste water is retrieved to the step, the effectual recovery efficiency who improves dirty waste water waste heat.
Description
Technical Field
The utility model relates to a waste water waste heat cascade recovery system, and belongs to the technical field of energy conservation and environmental protection.
Background
For the waste heat recovery field of sewage and waste water, the technology of the direct heat engine is a simple and direct effective mode, and is characterized in that the technology is different from the traditional direct contact heat exchange principle of sewage and waste water and a heat exchange wall surface, and utilizes the characteristic that the boiling point of water is reduced along with the rising of the vacuum degree, a vacuum pump is used for artificially manufacturing a vacuum environment, and the sewage and waste water are flashed to obtain exhaust steam and the vaporization latent heat is recovered. Although the vacuum level can be theoretically increased up to the limit evaporation temperature of water is guaranteed to be close to 0 ℃, for practical engineering applications, particularly for large-scale systems and conditions that the sewage and wastewater contain a large amount of non-condensable gas, the vacuum level in the system is increased by pursuing a lower evaporation temperature, so that the manufacturing, using and maintaining costs of equipment are greatly increased, and the usability and energy-saving characteristics of the equipment are reduced.
The current technical shortcomings of this technology are therefore represented by: if the normal and stable operation temperature of the direct heat engine cannot be lower than 35 ℃ under the condition of ensuring certain economical efficiency of the direct heat engine, otherwise, the equipment cost and the power consumption for maintaining the operation of a vacuum system are greatly increased, so that the economical efficiency of the waste heat recovery cost is reduced, and the direct heat engine loses the use value. This also results in that the direct heating engine has low recovery efficiency of waste heat of low-temperature sewage and waste water, and certain energy waste exists.
Disclosure of Invention
The utility model aims to solve the problem of low recovery efficiency of low-temperature sewage waste heat by the conventional direct heat engine, and further provides a sewage waste heat cascade recovery system.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the waste water and waste heat cascade recovery system comprises a flash evaporator, a condenser and a sewage heat exchanger, wherein the shell side of the condenser is communicated with a vacuum pump and a condensate water outlet pipe,
the upper part of the flash evaporator is provided with a first sewage and wastewater liquid inlet, the lower part of the flash evaporator is provided with a first sewage and wastewater liquid outlet,
the sewage heat exchanger is provided with a second sewage water inlet, a second sewage water outlet, a first water inlet to be heated and a first water outlet to be heated,
the tube side of the condenser is communicated with a second water inlet and a second water outlet for heating water,
the steam outlet of the flash evaporator is communicated with the shell side of the condenser through a steam channel, the first sewage and wastewater liquid outlet is communicated to the second sewage and wastewater liquid inlet through a sewage and wastewater liquid outlet pipe, and a water return pump is arranged on the sewage and wastewater liquid outlet pipe.
Further, the first water outlet to be heated and the second water inlet to be heated are communicated through the water pipeline to be heated.
Further, the sewage heat exchanger is a runner type sewage heat exchanger.
A waste water waste heat cascade recovery system comprises a flash evaporator, a condenser and a sewage heat exchanger, wherein
The shell side of the condenser is communicated with a vacuum pump and a condensed water outlet pipe,
the upper part of the flash evaporator is provided with a first sewage and wastewater liquid inlet, the lower part of the flash evaporator is provided with a first sewage and wastewater liquid outlet,
the sewage heat exchanger is provided with a second sewage water inlet, a second sewage water outlet, a first water inlet to be heated and a first water outlet to be heated,
the tube side of the condenser is communicated with a second water inlet and a second water outlet for heating water,
the steam outlet of the flash evaporator is communicated with the shell side of the condenser through a steam channel,
the second sewage outlet is communicated to the first sewage inlet through a sewage outlet pipe, and a water-removing pump is arranged on the sewage outlet pipe.
Further, the second water outlet to be heated and the first water inlet to be heated are communicated through the water pipeline to be heated.
Further, the sewage heat exchanger is a runner type sewage heat exchanger.
Compared with the prior art, the utility model has the following effects:
the application uses the integrative form of arranging of sewage heat exchanger and direct heat engine series connection, under the prerequisite of guaranteeing to dirty waste water quality adaptation, effectively improved the heat recovery efficiency of low temperature dirty waste water, according to the medium quality difference of waste heat output side, the low temperature dirty waste water temperature after the waste heat recovery, it is least about 15 ℃ that can reach, compare direct heat engine, improved nearly 20 ℃ difference in temperature utilization scope, solved the problem that direct heat engine is low to low temperature dirty waste water heat energy utilization efficiency.
Drawings
FIG. 1 is a schematic diagram of a system according to a first embodiment of the present application;
fig. 2 is a schematic diagram of a system composition according to a second embodiment of the present application.
Detailed Description
The first embodiment is as follows: referring to FIG. 1, the embodiment is a step recovery system for waste water and waste heat, comprising a flash evaporator 1, a condenser 2 and a sewage heat exchanger 3, wherein
The shell side of the condenser 2 is communicated with a vacuum pump 4 and a condensate outlet pipe 5,
the upper part of the flash evaporator 1 is provided with a first sewage and wastewater liquid inlet 11, the lower part of the flash evaporator 1 is provided with a first sewage and wastewater liquid outlet 12,
the sewage heat exchanger 3 is provided with a second sewage inlet 31, a second sewage outlet 32, a first water inlet 33 to be heated and a first water outlet 34 to be heated,
the tube side of the condenser 2 is communicated with a second water inlet 21 to be heated and a second water outlet 22 to be heated,
the steam outlet of the flash evaporator 1 is communicated with the shell side of the condenser 2 through a steam channel 6, the first sewage and wastewater outlet 12 is communicated to the second sewage and wastewater inlet 31 through a sewage and wastewater outlet pipe, and a water return pump 7 is arranged on the sewage and wastewater outlet pipe.
Through the waste heat recovery system of this application, make the dirty waste water medium of heat release side get into direct heat engine and sewage heat exchanger 3 in grades, according to dirty waste water temperature's difference, the waste heat of dirty waste water is retrieved to the step, the effectual recovery efficiency who improves dirty waste water waste heat.
The application uses the integrative form of arranging of sewage heat exchanger 3 and direct heat engine series connection, under the prerequisite of guaranteeing to dirty waste water quality adaptation, effectively improved the heat recovery efficiency of low temperature dirty waste water, according to the medium quality difference of waste heat output side, the low temperature dirty waste water temperature after the waste heat recovery, it is least about 15 ℃ that can reach, compare direct heat engine, improved nearly 20 ℃ difference in temperature utilization scope, solved the problem that direct heat engine is low to low temperature dirty waste water heat energy utilization efficiency.
Through the waste heat recovery system, on the premise of ensuring the water quality adaptability of the system to low-quality sewage and waste water, the heat exchange temperature difference of the sewage and waste water is effectively increased, and the recovery efficiency of the waste heat of the sewage and waste water is improved; under the condition of recovering the same residual heat, the energy consumption is lower compared with the direct heat engine technology; the system has the advantages of simple connection, convenient maintenance, stable operation and high popularization value, and has wide market prospect.
The process flow comprises the following steps:
1. the waste water and waste heat utilization flow comprises the following steps: the sewage and wastewater enters the flash evaporator 1 through the first sewage and wastewater liquid inlet 11, flash evaporation, heat release and temperature reduction occur under the negative pressure environment of the flash evaporator 1, the cooled sewage and wastewater passes through the first sewage and wastewater liquid outlet 12, and under the action of the water return pump 7, the sewage and wastewater enters the sewage heat exchanger 3 through the second sewage and wastewater liquid inlet 31, and the sewage and wastewater enters the sewage heat exchanger 3 to be subjected to heat exchange with water to be heated and then is discharged out of the system through the second sewage and wastewater liquid outlet 32.
2. And (3) a dead steam flow: the waste steam generated by the sewage and wastewater in the flash evaporator 1 acts through a demister 13 in the flash evaporator 1 to remove carried droplets, the droplets enter the condenser 2 through the steam channel 6, heat is transferred to water to be heated, and then phase-change condensation is changed into condensed water, and the condensed water is discharged through the condensed water outlet pipe 5.
3. The flow of water to be heated is as follows: the water to be heated which needs to be heated enters the sewage heat exchanger 3 through the first water inlet 33 to be heated, is discharged from the first water outlet 34 to be heated after absorbing the heat of sewage and waste water, and enters the condenser 2 through the second water inlet 21 to be heated after the water to be heated or the sewage heat exchanger 3 is heated once, and is discharged from the second water outlet 22 after absorbing the heat emitted by exhaust steam.
The first water outlet 34 to be heated and the second water inlet 21 to be heated are communicated through a water pipeline to be heated. So designed, the first water outlet 34 to be heated of the sewage heat exchanger 3 is communicated with the second water inlet 21 to be heated of the condenser 2 through a pipeline, after the water to be heated is subjected to primary temperature rise through heat exchange between the sewage heat exchanger 3 and sewage and wastewater, the water to be heated enters the condenser 2 to be subjected to secondary temperature rise with flash steam, and the heating temperature of the water to be heated is further increased.
The sewage heat exchanger 3 is a runner type sewage heat exchanger.
The second embodiment is as follows: referring to FIG. 2, a step recovery system for waste water and waste heat of sewage includes a flash evaporator 1, a condenser 2 and a sewage heat exchanger 3, wherein
The shell side of the condenser 2 is communicated with a vacuum pump 4 and a condensate outlet pipe 5,
the upper part of the flash evaporator 1 is provided with a first sewage and wastewater liquid inlet 11, the lower part of the flash evaporator 1 is provided with a first sewage and wastewater liquid outlet 12,
the sewage heat exchanger 3 is provided with a second sewage inlet 31, a second sewage outlet 32, a first water inlet 33 to be heated and a first water outlet 34 to be heated,
the tube side of the condenser 2 is communicated with a second water inlet 21 to be heated and a second water outlet 22 to be heated,
the steam outlet of the flash evaporator 1 is communicated with the shell side of the condenser 2 through a steam channel 6,
the second sewage outlet 32 is communicated to the first sewage inlet 11 through a sewage outlet pipe, and the sewage outlet pipe is provided with a water-removing pump 7.
Through the waste heat recovery system of this application, make the dirty waste water medium of heat release side get into sewage heat exchanger 3 and direct heat engine in grades, according to dirty waste water temperature's difference, the waste heat of dirty waste water is retrieved to the step, the effectual recovery efficiency who improves dirty waste water waste heat.
The application uses the integrative form of arranging of sewage heat exchanger 3 and direct heat engine series connection, under the prerequisite of guaranteeing to dirty waste water quality adaptation, effectively improved the heat recovery efficiency of low temperature dirty waste water, according to the medium quality difference of waste heat output side, the low temperature dirty waste water temperature after the waste heat recovery, it is least about 15 ℃ that can reach, compare direct heat engine, improved nearly 20 ℃ difference in temperature utilization scope, solved the problem that direct heat engine is low to low temperature dirty waste water heat energy utilization efficiency.
Through the waste heat recovery system, on the premise of ensuring the water quality adaptability of the system to low-quality sewage and waste water, the heat exchange temperature difference of the sewage and waste water is effectively increased, and the recovery efficiency of the waste heat of the sewage and waste water is improved; under the condition of recovering the same residual heat, the energy consumption is lower compared with the direct heat engine technology; the system has the advantages of simple connection, convenient maintenance, stable operation and high popularization value, and has wide market prospect.
The process flow comprises the following steps:
1. the waste water and waste heat utilization flow comprises the following steps: the sewage enters the sewage heat exchanger 3 through the second sewage liquid inlet 31, releases heat and lowers temperature in the sewage heat exchanger 3, the cooled sewage passes through the second sewage liquid outlet 32, enters the flash evaporator 1 through the first sewage liquid inlet 11 under the action of the water return pump 7, and undergoes flash evaporation, heat release and temperature lowering under the negative pressure environment of the flash evaporator 1, and then is discharged out of the system through the first sewage liquid outlet 12.
2. And (3) a dead steam flow: the waste steam generated by the sewage and wastewater in the flash evaporator 1 acts through a demister 13 in the flash evaporator 1 to remove carried droplets, the droplets enter the condenser 2 through the steam channel 6, heat is transferred to water to be heated, and then phase-change condensation is changed into condensed water, and the condensed water is discharged through the condensed water outlet pipe 5.
3. The flow of water to be heated is as follows: the water to be heated which needs to be heated enters the condenser 2 through the second water inlet 21 to be heated, is discharged from the second water outlet 22 after absorbing the heat of exhaust steam, and enters the sewage heat exchanger 3 through the first water inlet 33 to be heated after the water to be heated or the water to be heated which is heated once through the condenser 2, and is discharged from the first water outlet 34 after absorbing the heat of sewage and waste water.
The second water outlet 22 to be heated is communicated with the first water inlet 33 to be heated through a water pipeline to be heated. So designed, the second water outlet 22 to be heated of the condenser 2 is communicated with the first water inlet 33 to be heated of the sewage heat exchanger 3 through the water pipeline to be heated, and after the water to be heated is firstly heated with flash steam through the condenser 2 for one time, the water enters the sewage heat exchanger 3 for heat exchange with sewage and wastewater for secondary temperature rise, so that the heating temperature of the water to be heated is further increased.
The sewage heat exchanger 3 is a runner type sewage heat exchanger.
Claims (6)
1. The utility model provides a dirty waste water waste heat cascade recovery system which characterized in that: comprises a flash evaporator (1), a condenser (2) and a sewage heat exchanger (3), wherein the shell side of the condenser (2) is communicated with a vacuum pump (4) and a condensed water outlet pipe (5),
the upper part of the flash evaporator (1) is provided with a first sewage and wastewater liquid inlet (11), the lower part of the flash evaporator (1) is provided with a first sewage and wastewater liquid outlet (12),
a second sewage water inlet (31), a second sewage water outlet (32), a first water inlet (33) to be heated and a first water outlet (34) to be heated are arranged on the sewage heat exchanger (3),
the tube side of the condenser (2) is communicated with a second water inlet (21) to be heated and a second water outlet (22) to be heated,
the steam outlet of the flash evaporator (1) is communicated with the shell side of the condenser (2) through a steam channel (6), a first sewage and wastewater outlet (12) is communicated to a second sewage and wastewater inlet (31) through a sewage and wastewater outlet pipe, and a water-removing pump (7) is arranged on the sewage and wastewater outlet pipe.
2. The waste water and waste heat gradient recovery system according to claim 1, wherein: the first water outlet (34) to be heated and the second water inlet (21) to be heated are communicated through a water pipeline to be heated.
3. A waste water waste heat step recovery system according to claim 1 or 2, characterized in that: the sewage heat exchanger (3) is a runner type sewage heat exchanger.
4. The utility model provides a dirty waste water waste heat cascade recovery system which characterized in that: comprises a flash evaporator (1), a condenser (2) and a sewage heat exchanger (3), wherein
The shell side of the condenser (2) is communicated with a vacuum pump (4) and a condensed water outlet pipe (5),
the upper part of the flash evaporator (1) is provided with a first sewage and wastewater liquid inlet (11), the lower part of the flash evaporator (1) is provided with a first sewage and wastewater liquid outlet (12),
a second sewage water inlet (31), a second sewage water outlet (32), a first water inlet (33) to be heated and a first water outlet (34) to be heated are arranged on the sewage heat exchanger (3),
the tube side of the condenser (2) is communicated with a second water inlet (21) to be heated and a second water outlet (22) to be heated,
the steam outlet of the flash evaporator (1) is communicated with the shell side of the condenser (2) through a steam channel (6),
the second sewage outlet (32) is communicated to the first sewage inlet (11) through a sewage outlet pipe, and a water-removing pump (7) is arranged on the sewage outlet pipe.
5. The waste water and waste heat gradient recovery system according to claim 4, wherein: the second water outlet (22) to be heated is communicated with the first water inlet (33) to be heated through a water pipeline to be heated.
6. A waste water waste heat step recovery system according to claim 4 or 5, wherein: the sewage heat exchanger (3) is a runner type sewage heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223493940.8U CN219083863U (en) | 2022-12-27 | 2022-12-27 | Waste water waste heat cascade recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223493940.8U CN219083863U (en) | 2022-12-27 | 2022-12-27 | Waste water waste heat cascade recovery system |
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| CN219083863U true CN219083863U (en) | 2023-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223493940.8U Active CN219083863U (en) | 2022-12-27 | 2022-12-27 | Waste water waste heat cascade recovery system |
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