CN113700631B - Low-temperature waste heat multistage coupling utilization system and process for large-sized gas compressor - Google Patents
Low-temperature waste heat multistage coupling utilization system and process for large-sized gas compressor Download PDFInfo
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- CN113700631B CN113700631B CN202110913884.XA CN202110913884A CN113700631B CN 113700631 B CN113700631 B CN 113700631B CN 202110913884 A CN202110913884 A CN 202110913884A CN 113700631 B CN113700631 B CN 113700631B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
- F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
- F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
- F04B39/064—Cooling by a cooling jacket in the pump casing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The utility model provides a multistage coupling utilization system of large-scale gas compressor low temperature waste heat and technology, includes compressor waste heat recovery unit, lithium bromide absorption refrigeration unit, hot water heat exchanger unit, water user, and the export of compressor waste heat recovery unit is connected lithium bromide absorption refrigeration unit and hot water heat exchanger unit respectively through the pipeline, is equipped with the branch pipeline on the connecting tube of compressor waste heat recovery unit and hot water heat exchanger unit, and this branch pipeline is connected lithium bromide absorption refrigeration unit's export pipeline, lithium bromide absorption refrigeration unit's export pipeline is connected compressor waste heat recovery unit, and hot water heat exchanger unit's export is through the pipeline connection compressor waste heat recovery unit, and hot water heat exchanger unit's heat exchange pipeline is connected water user. According to the invention, more than one low-temperature waste heat utilization technology is utilized, and through integrated optimization design, the low-temperature waste heat utilization system can be adjusted in real time according to the heat load demands of users, including heat demands and target temperature demands, so that the waste heat recovery efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of air separation oxygen production industrial energy, and particularly relates to a low-temperature waste heat multistage coupling utilization system and process of a large-sized gas compressor.
Background
At present, the exhaust temperature of each stage of the large-scale compressor is about 100 ℃, and in order to ensure normal production, the high-temperature gas is usually cooled by a cooler. The cooled heat energy is released to the environment, so that the heat loss is caused, and the electric energy of the fan of the cooling tower is consumed. The energy utilization efficiency can be obviously improved by recycling the exhaust waste heat of each stage of the compressor, and the energy utilization cost is reduced. Belongs to low-temperature waste heat which is difficult to use.
The low-temperature waste heat utilization technology which is mature at home and abroad at present comprises a central heating technology, a lithium bromide absorption refrigeration technology and an organic Rankine cycle power generation technology. The central heating technology is widely applied, and the compressor is used for exhausting and producing heating water at about 60 ℃, so that the central heating technology has the advantages of high waste heat utilization efficiency and remarkable economic benefit. However, district heating applications have explicit geographical and seasonal restrictions. In non-central heating areas or non-heating seasons, the problem of low or zero utilization of the compressor waste heat still exists.
Disclosure of Invention
The invention aims to provide a low-temperature waste heat multistage coupling utilization system and a low-temperature waste heat multistage coupling utilization process for a large-scale gas compressor, which utilize more than one low-temperature waste heat utilization technology, and enable the low-temperature waste heat utilization system to be adjusted in real time according to the heat load demands of users, including the heat demands and the target temperature demands, through integrated optimization design so as to improve the waste heat recovery efficiency.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the utility model provides a multistage coupling utilization system of large-scale gas compressor low temperature waste heat, includes compressor waste heat recovery unit, lithium bromide absorption refrigeration unit, hot water heat exchanger unit, water user, the export of compressor waste heat recovery unit is connected lithium bromide absorption refrigeration unit and hot water heat exchanger unit respectively through the pipeline be equipped with the branch pipeline on the connecting tube of compressor waste heat recovery unit and hot water heat exchanger unit, this branch pipeline is connected lithium bromide absorption refrigeration unit's export pipeline, lithium bromide absorption refrigeration unit's export pipeline connects compressor waste heat recovery unit, hot water heat exchanger unit's export is through the compressor waste heat recovery unit of pipe connection, hot water heat exchanger unit's heat exchange pipeline connects water user.
A valve DH4 is arranged on the branch pipe.
A valve DH2 is arranged on an inlet pipeline of the lithium bromide absorption refrigerating unit, a valve DH5 is arranged on an outlet pipeline of the lithium bromide absorption refrigerating unit, and the valve DH5 is arranged behind a branch pipeline; the inlet pipeline of the hot water heat exchanger unit is provided with a valve DH3, the valve DH3 is arranged in front of the branch pipeline, and the outlet pipeline of the hot water heat exchanger unit is provided with a valve DH6.
A waste heat utilization process of a low-temperature waste heat multistage coupling utilization system of a large-scale gas compressor specifically comprises the following steps:
1) The waste heat recovery unit utilizes the exhaust gas of the compressor at 100-120 ℃ to generate hot water at 75-85 ℃ so as to meet the requirements of lithium bromide absorption refrigeration technology and central heating technology or domestic water on the temperature of heat source water;
2) The distribution modes of the heat source water generated by the compressor waste heat unit between the absorption refrigerating unit and the hot water heat exchange unit are two, namely a serial distribution mode and a parallel distribution mode;
serial distribution mode:
a) The heat source water is firstly subjected to heat exchange by a lithium bromide absorption refrigerating unit to cool down to 55-60 ℃ so as to prepare cold water with the temperature of 10-15 ℃; the cooled heat source water passes through a hot water heat exchange unit to prepare domestic or heating hot water at 40-50 ℃;
b) The heat source water is firstly subjected to heat exchange by a lithium bromide absorption refrigerating unit to cool down to 55-60 ℃ so as to prepare cold water with the temperature of 10-15 ℃; mixing part of high-temperature heat source water with cooled heat source water from a lithium bromide absorption refrigerating unit, and sending the mixture into a hot water heat exchange unit to prepare domestic or heating hot water with the temperature of more than 50 ℃; the bypass flow is controlled through DH3, so that the temperature of heat source water entering the hot water heat exchange unit is controlled, and the temperature of hot water supply can be properly increased in the mode;
the parallel distribution mode is as follows:
the parallel distribution mode is that the two paths of heat source water are simultaneously distributed to a lithium bromide absorption refrigerating unit and a hot water heat exchange unit to respectively prepare cold water with the temperature of 10-15 ℃ and domestic or heating hot water with the temperature of 60 ℃ at most.
Compared with the prior art, the invention has the beneficial effects that:
the capacity of a single waste heat recovery system is not matched due to the change of heat, cold and corresponding temperature demands of heat users, so that the problem of waste heat recovery rate reduction is solved by adjusting the reasonable distribution of heat source water in different low-temperature waste heat recovery systems, thereby finding out effective measures for improving the low-temperature waste heat recovery efficiency of a compressor, and having positive significance for improving the design and operation of an industrial low-temperature waste heat utilization system.
The low-temperature waste heat recovery system can realize cascade utilization of low-temperature waste heat through a serial-parallel structure of the lithium bromide absorption refrigerating unit and the hot water heat exchange unit. The distribution of the heat source water can be adjusted according to the change of the demand of a heat user, so that the heat source water is reduced to a target design value of 50 ℃, and the waste heat recovery efficiency is improved in the actual operation process.
Drawings
FIG. 1 is a process flow diagram (series one) of the present invention.
FIG. 2 is a process flow diagram (series two) of the present invention.
FIG. 3 is a process flow diagram (parallel) of the present invention.
Description of the embodiments
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are merely examples and are not intended to limit the present invention.
The following specific description of the implementation steps of the present invention is provided with reference to the examples and the accompanying drawings:
the invention considers the integrated lithium bromide absorption refrigeration technology and the water-water heat exchange central heating technology, recovers the low-temperature waste heat of the compressor, and simultaneously meets the cold load and heat load demands of users in summer and winter. The integration mode must consider the requirements of different low-temperature waste heat utilization technologies on the temperature of the heat source. The utility model provides a multistage coupling utilization system of large-scale gas compressor low temperature waste heat, includes compressor waste heat recovery unit, lithium bromide absorption refrigeration unit, hot water heat exchanger unit, water user, the export of compressor waste heat recovery unit is connected lithium bromide absorption refrigeration unit and hot water heat exchanger unit respectively through the pipeline be equipped with the branch pipeline on the connecting tube of compressor waste heat recovery unit and hot water heat exchanger unit, this branch pipeline is connected lithium bromide absorption refrigeration unit's export pipeline, lithium bromide absorption refrigeration unit's export pipeline connects compressor waste heat recovery unit, hot water heat exchanger unit's export is through the compressor waste heat recovery unit of pipe connection, hot water heat exchanger unit's heat exchange pipeline connects water user.
A valve DH4 is arranged on the branch pipe.
A valve DH2 is arranged on an inlet pipeline of the lithium bromide absorption refrigerating unit, a valve DH5 is arranged on an outlet pipeline of the lithium bromide absorption refrigerating unit, and the valve DH5 is arranged behind a branch pipeline; the inlet pipeline of the hot water heat exchanger unit is provided with a valve DH3, the valve DH3 is arranged in front of the branch pipeline, and the outlet pipeline of the hot water heat exchanger unit is provided with a valve DH6.
In a single 17 ten thousand m 3 Taking waste heat recycling of a final-stage exhaust gas as an example, the specific implementation steps are as follows:
1) According to the exhaust capacity of the air compressor, 17 ten thousand meters 3 And/h, the exhaust temperature is 100 ℃, and the temperature is reduced to 60 ℃ after waste heat recovery; setting the water supply/return temperature of the heat source water to be 85 ℃/50 ℃ for calculation, and generating 112t/h of heat source water quantity;
2) In a serial connection mode, the temperature of heat source water is reduced to 60 ℃ after passing through a lithium bromide absorption refrigerating unit, and then the temperature is reduced to 50 ℃ after passing through a hot water heat exchange unit; in a parallel mode, heat source water passes through the lithium bromide absorption refrigerating unit and the hot water heat exchange unit at the same time, and is reduced to 50 ℃, and the two paths of heat source water are mixed and returned to the waste heat recovery unit;
series mode (state one): as shown in fig. 1, butterfly valves DH2, DH4 and DH6 are opened, DH3 and DH5 are closed, a lithium bromide absorption refrigerating unit is set to prepare cold water at 12 ℃, the highest temperature of a concentrated solution in a refrigerating unit generator is 53 ℃, a driving heat source temperature difference is considered according to 30 ℃, a low-temperature heat source at 83 ℃ or above is needed, and the heat source water meets the requirement at 85 ℃; the COP value of the single-effect hot water type lithium bromide absorption refrigerating unit is considered according to 0.79, the refrigerating capacity is 2582kW, and the cold water yield is 368.9t/h; the inlet heat source water temperature of the hot water heat exchanger unit is 60 ℃, so that domestic hot water with the temperature of 50 ℃ at most can be generated, and hot water with the temperature of 36.9t/h can be generated according to the temperature rising of 30 ℃;
series mode (state two): as shown in FIG. 2, when the butterfly valve DH3 is opened, if the bypass flow of the heat source water is 23t/h, the flow of the heat source water passing through the lithium bromide absorption refrigerating unit is 89t/h, the heat source water is mixed with the bypass heat source water after heat exchange of the refrigerating unit, and the temperature of the heat source water entering the hot water heating unit is 65 ℃ at the moment, so that the temperature of the hot water supply can be increased to be more than 50 ℃.
The parallel connection mode is as follows: as shown in fig. 3, butterfly valves DH2, DH3, DH5 and DH6 are opened, DH4 is closed, and if the heat source water distribution flow is set to 82t/h of the lithium bromide absorption refrigeration unit, then 2645kW of cold energy and 378t/h of chilled water can be produced; the heat source water quantity of the hot water heating unit is 30t/h, the heat supply quantity is 1225kW, and the heat supply quantity is 35t/h.
Through measurement and calculation, the low-temperature waste heat recovery system provided by the invention can adjust the distribution of the heat source water according to the change of the heat user demand, thereby ensuring that the heat source water is reduced to the target design value of 50 ℃, and further improving the waste heat recovery efficiency in the actual operation process.
The present invention is capable of embodiments and its several embodiments, and its several modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention, but these modifications and variations are to be considered as falling within the scope of the appended claims.
Claims (2)
1. The utility model provides a multistage coupling utilization system of large-scale gas compressor low temperature waste heat, its characterized in that includes compressor waste heat recovery unit, lithium bromide absorption refrigeration unit, hot water heat exchanger unit, water user, the export of compressor waste heat recovery unit is connected lithium bromide absorption refrigeration unit and hot water heat exchanger unit respectively through the pipeline be equipped with the branch pipeline on the connecting tube of compressor waste heat recovery unit and hot water heat exchanger unit, this branch pipeline is connected lithium bromide absorption refrigeration unit's export pipeline, lithium bromide absorption refrigeration unit's export pipeline is connected compressor waste heat recovery unit, the export of hot water heat exchanger unit is connected compressor waste heat recovery unit through the pipeline, hot water heat exchanger unit's heat exchange pipeline is connected water user,
a valve DH4 is arranged on the branch pipe,
a valve DH2 is arranged on an inlet pipeline of the lithium bromide absorption refrigerating unit, a valve DH5 is arranged on an outlet pipeline of the lithium bromide absorption refrigerating unit, and the valve DH5 is arranged behind a branch pipeline; a valve DH3 is arranged on an inlet pipeline of the hot water heat exchanger unit, the valve DH3 is arranged in front of a branch pipeline, a valve DH6 is arranged on an outlet pipeline of the hot water heat exchanger unit,
the waste heat utilization process of the large-scale gas compressor low-temperature waste heat multistage coupling utilization system specifically comprises the following steps:
1) The waste heat recovery unit utilizes the exhaust gas of the compressor at 100-120 ℃ to generate hot water at 75-85 ℃;
2) The distribution mode of the heat source water generated by the compressor waste heat unit between the absorption refrigerating unit and the hot water heat exchange unit is a serial distribution mode, in particular to a butterfly valve DH2, DH3, DH4 and DH6 is opened, a butterfly valve DH5 is closed,
the method comprises the following steps:
a) The heat source water firstly undergoes heat exchange by a lithium bromide absorption refrigerating unit to be cooled, and the cooled heat source water passes through a hot water heat exchange unit to prepare domestic or heating hot water;
b) The heat source water is subjected to heat exchange by the lithium bromide absorption refrigerating unit to cool, part of high-temperature heat source water is mixed with the cooled heat source water from the lithium bromide absorption refrigerating unit, and the mixed heat source water and the cooled heat source water are sent into the hot water heat exchange unit together to prepare domestic or heating hot water.
2. The multi-stage coupling utilization system of low-temperature waste heat of a large gas compressor according to claim 1, wherein in the serial distribution mode, heat source water is cooled by heat exchange of a lithium bromide absorption refrigerating unit, and the temperature is reduced to 55-60 ℃ to prepare cold water with the temperature of 10-15 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110913884.XA CN113700631B (en) | 2021-08-10 | 2021-08-10 | Low-temperature waste heat multistage coupling utilization system and process for large-sized gas compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110913884.XA CN113700631B (en) | 2021-08-10 | 2021-08-10 | Low-temperature waste heat multistage coupling utilization system and process for large-sized gas compressor |
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| CN113700631A CN113700631A (en) | 2021-11-26 |
| CN113700631B true CN113700631B (en) | 2023-08-15 |
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Citations (6)
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| CN201740299U (en) * | 2010-05-13 | 2011-02-09 | 中原工学院 | Combined heat pump heat exchange type high-temperature heat pump |
| CN204226141U (en) * | 2014-10-18 | 2015-03-25 | 杭州哲达科技股份有限公司 | Air-compressor set heat recovery integrated refrigerating device |
| CN104995478A (en) * | 2012-12-19 | 2015-10-21 | 马克卡车公司 | Series parallel waste heat recovery system |
| CN108561314A (en) * | 2017-12-27 | 2018-09-21 | 张明新 | Residual heat of air compressor utilizes type cold dryer system |
| CN210090396U (en) * | 2019-03-05 | 2020-02-18 | 华电电力科学研究院有限公司 | SCR denitration catalyst performance detection device |
| CN211159025U (en) * | 2019-11-21 | 2020-08-04 | 秦皇岛格瑞因环境工程有限公司 | Energy recycling system for spraying waste gas adsorption, desorption and purification treatment unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9994751B2 (en) * | 2008-04-30 | 2018-06-12 | Honeywell International Inc. | Absorption refrigeration cycles using a LGWP refrigerant |
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2021
- 2021-08-10 CN CN202110913884.XA patent/CN113700631B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201740299U (en) * | 2010-05-13 | 2011-02-09 | 中原工学院 | Combined heat pump heat exchange type high-temperature heat pump |
| CN104995478A (en) * | 2012-12-19 | 2015-10-21 | 马克卡车公司 | Series parallel waste heat recovery system |
| CN204226141U (en) * | 2014-10-18 | 2015-03-25 | 杭州哲达科技股份有限公司 | Air-compressor set heat recovery integrated refrigerating device |
| CN108561314A (en) * | 2017-12-27 | 2018-09-21 | 张明新 | Residual heat of air compressor utilizes type cold dryer system |
| CN210090396U (en) * | 2019-03-05 | 2020-02-18 | 华电电力科学研究院有限公司 | SCR denitration catalyst performance detection device |
| CN211159025U (en) * | 2019-11-21 | 2020-08-04 | 秦皇岛格瑞因环境工程有限公司 | Energy recycling system for spraying waste gas adsorption, desorption and purification treatment unit |
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| CN113700631A (en) | 2021-11-26 |
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