CN114251874B - Compact waste heat utilization system and waste heat utilization method thereof - Google Patents
Compact waste heat utilization system and waste heat utilization method thereof Download PDFInfo
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- CN114251874B CN114251874B CN202111638260.8A CN202111638260A CN114251874B CN 114251874 B CN114251874 B CN 114251874B CN 202111638260 A CN202111638260 A CN 202111638260A CN 114251874 B CN114251874 B CN 114251874B
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- heat
- waste heat
- water
- temperature channel
- heat utilization
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- 239000002918 waste heat Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000010521 absorption reaction Methods 0.000 claims abstract description 22
- 239000006096 absorbing agent Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention relates to the technical field of heat supply by utilizing waste heat, in particular to a compact waste heat utilization system and a waste heat utilization method thereof. The heat-utilization system comprises a first type of absorption heat pump, a heat exchanger and a heat-utilization demand end, wherein the first type of absorption heat pump comprises a generator, a condenser, an evaporator and an absorber, the heat exchanger comprises a high-temperature channel and a low-temperature channel, and the heat-utilization demand end is sequentially connected with the evaporator, the low-temperature channel, the absorber, the condenser and the heat user end through pipelines to form a circulation loop; the generator inlet is connected with a driving heat source, and the high-temperature channel inlet is connected with a waste heat source. The invention omits an intermediate water circulation system by adopting a new waste heat utilization mode, eliminates related equipment of intermediate water, reduces the comprehensive cost of waste heat recovery, provides a more compact, simple and energy-saving process, and provides conditions for recovering waste heat to the greatest extent.
Description
Technical Field
The invention relates to the technical field of heat supply by utilizing waste heat, in particular to a compact waste heat utilization system and a waste heat utilization method thereof.
Background
At present, various heat pump devices are widely applied to various waste heat recovery systems, wherein a heat-increasing type absorption heat pump takes high-temperature heat energy as a driving force, extracts low-temperature waste heat, supplies heating, hot water or process heat, has certain energy-saving, environment-friendly and economic benefits, and is widely applied.
However, if the conventional absorption heat pump is used for recovering waste heat sources (such as waste water with poor water quality) containing some special components/requirements or other waste heat sources which cannot be directly recycled by the heat pump, a set of intermediate water circulating water system is added between the absorption heat pump and the waste heat sources, heat exchange is carried out between the intermediate water and the waste heat sources, and then the intermediate water is pumped into a heat pump unit by using the intermediate water circulating water pump for heat recovery.
Related auxiliary equipment such as an intermediate circulating water pump, an intermediate water supplementing pump, a water supplementing tank, a water softening device and the like and control components are additionally arranged in the flow, and the added equipment causes the increase of waste heat recovery investment and operation cost (such as consumption of electric energy and chemical agents), and the control strategy becomes complex and is not beneficial to control; and the waste heat source exchanges heat with intermediate water firstly, the intermediate water enters the heat pump again to recover heat, and part of heat is lost due to poor heat exchange end.
Disclosure of Invention
A first object of the present invention is to provide a compact waste heat utilization system capable of omitting intermediate water circulation, fully utilizing heat of a waste heat source, improving a waste heat recovery conversion rate, and improving a pipe network conveying capacity.
A second object of the present invention is to provide a waste heat utilization method of a compact waste heat utilization system.
The invention provides a compact waste heat utilization system, which comprises a first type of absorption heat pump, a heat exchanger and a heat utilization demand end, wherein the first type of absorption heat pump comprises a generator, a condenser, an evaporator and an absorber, the heat exchanger comprises a high-temperature channel and a low-temperature channel,
the heat user end is sequentially connected with the evaporator, the low-temperature channel, the absorber, the condenser and the heat user end through pipelines to form a circulation loop;
the generator inlet is connected with a driving heat source, and the high-temperature channel inlet is connected with a waste heat source.
Preferably, a circulating pump is arranged on a pipeline between the heat user end and the evaporator.
Preferably, the circulating pump is communicated with the low-temperature channel inlet through a connecting pipeline.
Preferably, the connecting pipeline is provided with a first valve.
Preferably, the driving heat source is a high-grade heat source.
Preferably, the heat exchanger is a plate heat exchanger or a shell-and-tube heat exchanger.
Preferably, the medium adopted in the circulation loop is water, and the water temperature in the low-temperature pipeline is lower than the temperature of the waste heat source.
A waste heat utilization method of a compact waste heat utilization system, comprising the steps of:
s1, driving a heat source to enter the generator, and releasing heat in the generator;
s2, water releases heat at the heat utilization demand end to supply heat, then enters the evaporator to release heat, the cooled water enters the low-temperature channel, the waste heat source enters the high-temperature channel, the water in the low-temperature channel absorbs the heat released by the inside of the high-temperature channel, the water after absorbing the heat enters the first type of absorption heat pump, the water sequentially passes through the absorber and the condenser to absorb the heat released by the driving heat source and the heat released by the evaporator, and the water after heating enters the heat utilization demand end again to complete one cycle.
Preferably, in step S2, the water releases heat at the heat consumer side to supply heat, and then is split into two paths, one path of the water enters the evaporator to release heat, the cooled water enters the low-temperature channel, and the other path of the water directly enters the low-temperature channel.
The beneficial effects are that:
the invention omits the intermediate water circulation system by adopting a new waste heat utilization mode, and banhes related equipment of intermediate water, thereby not only reducing the initial investment of the waste heat utilization system, but also avoiding the running cost of extra consumed electric quantity and chemical agents required by related equipment in the intermediate water circulation system, reducing the comprehensive cost of waste heat recovery, providing a more compact, simple and energy-saving process and providing conditions for maximally recovering the waste heat.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
reference numerals illustrate:
1-generator, 2-evaporator, 3-absorber, 4-condenser, 5-first valve, 6-circulating pump, 7-first type absorption heat pump, 8-heat exchanger, 9-low temperature channel, 10-high Wen Tongdao, 11-heat utilization demand end.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
A compact waste heat utilization system, as shown in fig. 1, comprises a first type absorption heat pump 7, a heat exchanger 8 and a heat utilization demand end 11, wherein the heat exchanger 8 comprises a high-temperature channel 10 and a low-temperature channel 9, and the first type absorption heat pump 7 comprises a generator 1, a condenser 4, an evaporator 2 and an absorber 3. The working principle and the internal structure of the first type of absorption heat pump 7 are conventional in the art, and are not described here in detail.
The heat demand end 11 is sequentially connected with the evaporator 2, the low-temperature channel 9, the absorber 3, the condenser 4 and the heat user end 11 through pipelines to form a circulation loop; a circulating pump 6 is arranged on a pipeline between the heat demand end 11 and the evaporator 2 to supply power for circulation. The circulating pump 6 is directly communicated with the inlet of the low-temperature channel 9 through a connecting pipeline.
The medium in the circulation loop is water, and medium-temperature water is used in the heat supply process. The temperature of the water in the low-temperature pipeline 9 is lower than that of the waste heat source, so that the heat exchanger 8 can work conveniently, and the heat released by the waste heat source can be absorbed conveniently.
The connecting pipeline is provided with a first valve 5, and the water in the pipeline can be fully or partially fed into the evaporator 2 to release heat by controlling the switch of the first valve 5. The proportion of water entering the evaporator 2 can also be controlled by adjusting the first valve 5, so that the temperature after cooling is controlled to be lower than the temperature of the waste heat source.
The inlet of the generator 1 is connected with a driving heat source which is a high-grade heat source. The inlet of the high-temperature channel 10 is connected with a waste heat source, and the waste heat source is the heat needing to be recovered.
The heat exchanger 8 is a plate heat exchanger or a shell-and-tube heat exchanger.
The working process comprises the following steps:
a waste heat utilization method of a compact waste heat utilization system comprises the following steps:
s1, driving a heat source to be input into a generator 1, and releasing heat Q2 in the generator 1;
s2, the water releases heat at a heat demand end 11 to supply heat, and then the water is divided into two paths, valves are arranged on the two paths, the valves are opened, one path of water in a pipeline enters an evaporator 2 to release heat Q1 for cooling, and the heat Q1 is absorbed by a first type absorption heat pump 7;
the other path directly enters the low-temperature channel 9, the two paths are mixed, the water temperature in the low-temperature channel 9 is lower than the temperature of the waste heat source, the heat Q3 released by the waste heat source in the high-temperature channel 10 is absorbed in the low-temperature channel 9, then the heat Q3 enters the first type of absorption heat pump 7 again, the heat Q4 is absorbed through the absorber 3 and the condenser 4 in sequence, and the warmed medium-temperature water enters the heat user side again to complete one-time circulation.
The heat Q4 is equal to the sum of the heat Q1 recovered by the evaporator 2 in the first-type absorption heat pump 7 and the heat Q2 released by the driving heat source entering the first-type absorption heat pump 7.
By adjusting the opening and closing of the first valve 5, the amount of water entering the evaporator 2 releasing heat can be adjusted. When the first valve 5 is closed, the water releases heat to supply heat at the heat demand end 11, then the water completely enters the evaporator 2 to release heat, the cooled water enters the low-temperature channel 9, the waste heat source enters the high Wen Tongdao, the water in the low-temperature channel 9 absorbs the heat released by the inside of the high-temperature channel 10, the water after absorbing the heat enters the first type absorption heat pump, the heat released by the driving heat source and the heat released by the evaporator are sequentially absorbed by the absorber 3 and the condenser 4, and the water after heating enters the heat user end again to complete one cycle.
In the above cycle, only the medium-temperature water is required to be heated, and the heat obtained by the medium-temperature water is the heat Q3 released by the waste heat source and the heat Q4 absorbed in the first-type absorption heat pump 7. Intermediate water circulation is omitted, heat loss is avoided, intermediate water is cooled by an evaporator before entering a heat exchanger, the utilization rate of waste heat is improved, meanwhile, released heat is absorbed by the first type absorption heat pump 7, the heat returns to the intermediate water in the subsequent circulation process, heat loss is reduced, and a more compact, simple and energy-saving waste heat utilization method is provided.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A compact waste heat utilization system is characterized by comprising a first type of absorption heat pump, a heat exchanger and a heat utilization demand end, wherein the first type of absorption heat pump comprises a generator, a condenser, an evaporator and an absorber, the heat exchanger comprises a high-temperature channel and a low-temperature channel,
the heat utilization demand end is sequentially connected with the evaporator, the low-temperature channel, the absorber, the condenser and the heat utilization demand end through pipelines to form a circulation loop;
the generator inlet is connected with a driving heat source, and the high-temperature channel inlet is connected with a waste heat source;
the waste heat utilization method of the compact waste heat utilization system comprises the following steps:
s1, driving a heat source to enter the generator, and releasing heat in the generator;
s2, the water releases heat at the heat utilization demand end to supply heat, and then the heat utilization demand end is divided into two paths, one path of the water enters the evaporator to release heat, the cooled water enters the low-temperature channel, the other path of the water directly enters the low-temperature channel, the waste heat source enters the high-temperature channel, the water in the low-temperature channel absorbs the heat released by the inside of the high-temperature channel, the water after absorbing the heat enters the first type of absorption heat pump, the heat released by the driving heat source and the heat released by the evaporator are absorbed through the absorber and the condenser in sequence, and the water after heating enters the heat user end again to complete one cycle.
2. The compact waste heat utilization system of claim 1, wherein a circulation pump is provided on a conduit between the heat demand end and the evaporator.
3. The compact waste heat utilization system of claim 2, wherein the circulation pump is in communication with the cryogenic channel inlet via a connecting conduit.
4. A compact waste heat utilization system as defined in claim 3, wherein the connecting conduit is provided with a first valve.
5. The compact waste heat utilization system of claim 1, wherein the driving heat source is a high grade heat source.
6. The compact waste heat utilization system of claim 1, wherein the heat exchanger is a plate heat exchanger or a shell and tube heat exchanger.
7. The compact waste heat utilization system of claim 1, wherein the medium employed in the circulation loop is water and the water temperature in the low temperature passage is lower than the temperature of the waste heat source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111638260.8A CN114251874B (en) | 2021-12-29 | 2021-12-29 | Compact waste heat utilization system and waste heat utilization method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111638260.8A CN114251874B (en) | 2021-12-29 | 2021-12-29 | Compact waste heat utilization system and waste heat utilization method thereof |
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| CN114251874A CN114251874A (en) | 2022-03-29 |
| CN114251874B true CN114251874B (en) | 2023-10-27 |
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