CN212274714U - Low-temperature waste heat recycling system - Google Patents
Low-temperature waste heat recycling system Download PDFInfo
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- CN212274714U CN212274714U CN201922043230.7U CN201922043230U CN212274714U CN 212274714 U CN212274714 U CN 212274714U CN 201922043230 U CN201922043230 U CN 201922043230U CN 212274714 U CN212274714 U CN 212274714U
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Abstract
The utility model provides a low-temperature waste heat recycling system, which consists of a flash tank, a vacuum pump, a compressor, an overheat eliminator, a steam pressure regulating valve, a spray pump, a nozzle and a gas-liquid separator; the steam outlet of the flash tank is connected with the inlet of a compressor, the outlet of the compressor is connected with the inlet of an overheating eliminator, the circulating water outlet of the overheating eliminator is connected with a spray pump, and the outlet of the spray pump returns to the overheating eliminator and is connected with a nozzle; the vacuum pump is connected with a noncondensable gas outlet at the top of the flash tank. The utility model recovers the waste heat of low-temperature hot water and low-pressure exhaust steam in a closed flash evaporation compression mode, thereby avoiding the problems of water loss and environmental thermal pollution caused by the traditional waste heat cooling; compared with the traditional heat recovery modes such as a heat pump and the like, the utility model reduces the heat transfer temperature difference of the low temperature side and improves the utilization rate of waste heat resources; the system has the characteristics of energy conservation, environmental protection, simple equipment, adjustable heat supply pressure and the like.
Description
Technical Field
The utility model relates to a low temperature waste heat recovery utilizes system belongs to the energy-conserving technical field of thermal technology.
Background
A large amount of low-temperature waste heat resources exist in the fields of ferrous metallurgy, petroleum refining, mechanical processing, thermal power generation, plastic chemical industry and the like, and the low-temperature waste heat resources mainly take the form of low-temperature hot water or low-pressure exhaust steam. Because the energy level and the taste are low, the waste heat cannot be directly utilized again, and the part of low-temperature waste heat is often discharged to the atmospheric environment through a cooling system. This not only results in a waste of a lot of resources, but also indirectly results in environmental pollution problems. In the season of lower ambient temperature, the hot humid air cooled by the waste heat is saturated and forms white fog at low temperature, and serious haze is formed after substances such as dust particles, organic waste gas and the like are attached to the surface of water vapor in the fog cluster.
At present, the steam compression type heat pump or absorption type heat pump technology is commonly adopted for industrial waste heat utilization, a system usually needs to be provided with huge heat exchange equipment, heat transfer temperature difference needs to be consumed on high and low heat source sides, effective utilization of waste heat resources and improvement of energy quality are greatly limited, in addition, a traditional heat pump system is influenced by factors such as thermodynamic performance of a circulating working medium, the temperature improvement range of the waste heat is limited, the temperature of a general heat supply side cannot exceed 100 ℃, and popularization and application of the heat pump technology are limited to a certain extent. With the increasing severity of the energy-saving and environment-friendly problems, the exploration of a low-temperature waste heat recycling system has important practical significance.
Disclosure of Invention
The utility model aims at the not enough of above-mentioned prior art existence, provide a low temperature waste heat recovery utilizes system.
A low temperature waste heat recovery system comprising: flash tank, vacuum pump, compressor, overheat eliminator, steam pressure regulating valve, spray pump, nozzle and gas-liquid separator.
The flash tank is of a closed kettle type structure, an inlet is formed in the side wall of the flash tank, a water outlet is formed in the bottom of the flash tank, and a flash steam outlet and a non-condensable gas outlet are formed in the top of the flash tank respectively; the gas-liquid separator is arranged in the flash tank; the overheat eliminator is of a closed cylindrical structure, a compressed steam inlet, a water replenishing port and a circulating water return port are respectively formed in the side wall of the overheat eliminator, a circulating water outlet and a sewage draining port are formed in the bottom of the overheat eliminator, and a steam outlet is formed in the top of the overheat eliminator.
A flash steam outlet at the top of the flash tank is connected with an inlet of the compressor, an outlet of the compressor is connected with a compressed steam inlet of the overheating eliminator, a circulating water outlet at the bottom of the overheating eliminator is connected with an inlet of the spray pump, and an outlet of the spray pump returns to the overheating eliminator through a circulating water return port on the side wall of the heat eliminator and is connected with the nozzle; a steam outlet at the top of the overheat eliminator is connected with the steam pressure regulating valve; the vacuum pump is connected with a noncondensable gas outlet at the top of the flash tank, and a valve is arranged on the connecting pipeline.
Preferably: the compressor is a variable frequency compressor, and is in the types of a screw compressor, a Roots compressor and a centrifugal compressor; the compression mode can be single-stage compression or multi-stage compression.
Preferably: the gas-liquid separator is a wire mesh type demister.
The utility model discloses during the operation: introducing low-temperature hot water or low-pressure exhaust steam into a flash tank, starting a compressor, then carrying out flash evaporation cooling on the low-temperature hot water in the flash tank to generate low-pressure steam, discharging the low-temperature water subjected to flash evaporation cooling through a water outlet at the bottom of the flash tank, heating and pressurizing the low-pressure steam obtained by flash evaporation through the compressor, eliminating overheating of the low-pressure steam through a heat eliminator in a spray water cooling mode to obtain saturated steam, and carrying out combined control on the steam pressure through the opening of a steam pressure regulating valve and the running frequency of the compressor; the non-condensable gas in the system is periodically exhausted out of the system through a vacuum pump.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses an energy that closed flash distillation compression mode carried low temperature hot water or low pressure exhaust steam is retrieved and is recycled, has avoided the big and serious scheduling problem of environmental pollution of water consumption that traditional low temperature waste heat cooling leads to. Compare with traditional heat pump waste heat recovery mode, the utility model discloses a carry out direct flash distillation and obtain high temperature high pressure steam after compressing to the waste heat, reduced the heat transfer difference in temperature of low temperature side, improved the effective utilization ratio of waste heat resource. In addition, the temperature and the pressure of steam supplied by the system can be conveniently controlled by regulating and controlling the steam pressure regulating valve and the rotating speed of the compressor. The utility model has the characteristics of energy-concerving and environment-protective, system's equipment is simple, heat supply side temperature pressure is adjustable etc.
Drawings
FIG. 1 is a schematic diagram of a low temperature waste heat recycling system of the present invention
In the figure, 1 is a flash tank, 2 is a vacuum pump, 3 is a compressor, 4 is an overheat eliminator, 5 is a pressure regulating valve, 6 is a spray pump, 11 is a wire mesh demister, and 41 is a nozzle.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific embodiments, which are given by way of illustration only and are not intended to limit the scope of the invention.
The first embodiment is as follows:
the embodiment is suitable for recovering the waste heat of the low-temperature hot water.
As shown in fig. 1, a low-temperature waste heat recycling system comprises a flash tank 1, a vacuum pump 2, a compressor 3, an overheat eliminator 4, a steam pressure regulating valve 5, a spray pump 6, a nozzle 41 and a gas-liquid separator 11.
The flash tank 1 is of a closed kettle type structure, an inlet is formed in the side wall, a water outlet is formed in the bottom, and a flash steam outlet and a non-condensable gas outlet are respectively formed in the top; a wire mesh type gas-liquid separator 11 is arranged in the flash tank; the overheat eliminator 4 is of a closed cylindrical structure, a compressed steam inlet, a water replenishing port and a circulating water return port are respectively formed in the side wall of the overheat eliminator, a circulating water outlet and a sewage draining port are formed in the bottom of the overheat eliminator, and a steam outlet is formed in the top of the overheat eliminator. A flash steam outlet at the top of the flash tank is connected with an inlet of the compressor 3, an outlet of the compressor is connected with a compressed steam inlet of the overheating eliminator, a circulating water outlet at the bottom of the overheating eliminator is connected with an inlet of the spray pump 6, and an outlet of the spray pump returns to the overheating eliminator through a circulating water return port on the side wall of the heat eliminator and is connected with the nozzle 41; a steam outlet at the top of the overheat eliminator is connected with the steam pressure regulating valve 5; the vacuum pump 2 is connected with a non-condensable gas outlet at the top of the flash tank, and a valve is arranged on a connecting pipeline; the compressor is a variable frequency screw compressor.
The low-temperature hot water temperature is 80 ℃, and the water supply amount is 100m3And h, evacuating the non-condensable gas in the system through the vacuum pump 2 after the system is started. Starting the screw compressor 3, flashing hot water in the flash tank 1 to 50 ℃ (the pressure is 0.12bar), wherein the obtained flash steam is 5.3t/h, the flash steam is heated and compressed to 2bar by the screw compressor 3, the exhaust temperature (overheating) of the outlet of the compressor is 410 ℃, the saturated exhaust temperature after passing through the overheating eliminator 4 is 120 ℃, and the power consumption of the screw compressor 3 is 1100 kW.
The present embodiment can change the exhaust pressure and temperature by the steam pressure regulating valve 5; the flash evaporation water vapor amount is changed by changing the flash evaporation temperature of hot water in the flash evaporation tank, and the power consumption and the vapor amount of the compressor corresponding to different operation parameters are shown in the following table:
TABLE 1 System operating parameters of example one under different operating conditions
The embodiment passes through low temperature water flash distillation, carries out the mode of heating compression to flash steam, realizes the recycle to low temperature water waste heat, obtains the relatively higher high temperature steam of energy taste, compares with traditional water source heat pump technique, and the heat transfer difference in the reducible low temperature side of this embodiment to can improve the utilization ratio of waste heat resource, and the system does not have huge indirect heating equipment, and the system is first invested lowly.
Example two:
the embodiment is suitable for recovering the waste heat of the low-pressure exhaust steam.
The system components and system connection methods of the present embodiment are the same as those of the first embodiment, and are not described herein again. In the embodiment, the low-pressure exhaust steam is used for 80 ℃ (saturation), the pressure is 0.47bar (a), the air input is 5t/h, the non-condensable gas in the system is pumped out by using a vacuum pump 2 after the system is started, the compressor 3 adopts a roots type compressor, the low-pressure exhaust steam is introduced into a flash tank 1, the low-pressure exhaust steam is heated and pressurized by the compressor 3 and then is compressed to 2bar, the exhaust superheat degree is eliminated by a heat eliminator 4, the exhaust saturation temperature is 120 ℃, and the power consumption of the compressor 3 is 470 kW. The obtained steam with the temperature of 120 ℃ (2bar) of 5t/h can be supplied to a heat load or recycled to a steam pipe network.
The system changes the exhaust pressure and the temperature through the steam pressure regulating valve 5 at the running time, and the power consumption of the compressor corresponding to different operating parameters is shown in the following table:
TABLE 2 System operating parameters for example two under different operating conditions
This embodiment carries out direct compression to low pressure exhaust steam, compares with low temperature hot water waste heat recovery system, has saved hot water flash process, and accessible steam pressure governing valve and compressor rotational speed are regulated and control, and is more convenient to the steam temperature, the pressure that the system supplied control. The embodiment has the characteristics of energy conservation, environmental protection, adjustable heat supply pressure and the like.
Although the present invention has been described in connection with the accompanying drawings, the present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit of the present invention, within the scope of the present invention.
Claims (4)
1. The utility model provides a low temperature waste heat recovery utilizes system which characterized in that: comprises a flash tank, a vacuum pump, a compressor, an overheat eliminator, a steam pressure regulating valve, a spray pump and a nozzle,
the flash tank is of a closed kettle type structure, an inlet is formed in the side wall of the flash tank, a water outlet is formed in the bottom of the flash tank, and a flash steam outlet and a non-condensable gas outlet are formed in the top of the flash tank respectively; the overheating eliminator is of a closed cylindrical structure, the side wall of the overheating eliminator is respectively provided with a compressed steam inlet, a water replenishing port and a circulating water return port, the bottom of the overheating eliminator is provided with a circulating water outlet and a sewage discharge port, and the top of the overheating eliminator is provided with a steam outlet;
a flash steam outlet at the top of the flash tank is connected with an inlet of the compressor, an outlet of the compressor is connected with a compressed steam inlet of the overheating eliminator, a circulating water outlet at the bottom of the overheating eliminator is connected with an inlet of the spray pump, an outlet of the spray pump is connected with a circulating water return port on the side wall of the overheating eliminator through a pipeline, and a port of the pipeline, which is positioned in the overheating eliminator, is connected with the nozzle; a steam outlet at the top of the overheat eliminator is connected with the steam pressure regulating valve; the vacuum pump is connected with a noncondensable gas outlet at the top of the flash tank, and a valve is arranged on the connecting pipeline.
2. The low temperature waste heat recovery system according to claim 1, wherein: and a gas-liquid separator is arranged in the flash tank.
3. The low temperature waste heat recovery system according to claim 2, wherein: the gas-liquid separator is a wire mesh type demister.
4. The low temperature waste heat recovery system according to claim 3, wherein: the compressor is a variable frequency compressor, and is in the types of a screw compressor, a Roots compressor and a centrifugal compressor; the compression mode can be single-stage compression or multi-stage compression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922043230.7U CN212274714U (en) | 2019-11-22 | 2019-11-22 | Low-temperature waste heat recycling system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922043230.7U CN212274714U (en) | 2019-11-22 | 2019-11-22 | Low-temperature waste heat recycling system |
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| CN212274714U true CN212274714U (en) | 2021-01-01 |
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| CN201922043230.7U Active CN212274714U (en) | 2019-11-22 | 2019-11-22 | Low-temperature waste heat recycling system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508952A (en) * | 2022-04-19 | 2022-05-17 | 天津乐科节能科技有限公司 | Impurity-containing superheated steam waste heat recovery system and method |
| CN117537505A (en) * | 2022-10-13 | 2024-02-09 | 付朝乾 | Heat pump unit for utilizing waste heat of cooling water of industrial enterprise |
-
2019
- 2019-11-22 CN CN201922043230.7U patent/CN212274714U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508952A (en) * | 2022-04-19 | 2022-05-17 | 天津乐科节能科技有限公司 | Impurity-containing superheated steam waste heat recovery system and method |
| CN114508952B (en) * | 2022-04-19 | 2022-07-05 | 天津乐科节能科技有限公司 | Impurity-containing superheated steam waste heat recovery system and method |
| CN117537505A (en) * | 2022-10-13 | 2024-02-09 | 付朝乾 | Heat pump unit for utilizing waste heat of cooling water of industrial enterprise |
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