CN111595172A - Coal chemical industry technology steam condensate energy cascade utilization system - Google Patents
Coal chemical industry technology steam condensate energy cascade utilization system Download PDFInfo
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- CN111595172A CN111595172A CN202010580479.6A CN202010580479A CN111595172A CN 111595172 A CN111595172 A CN 111595172A CN 202010580479 A CN202010580479 A CN 202010580479A CN 111595172 A CN111595172 A CN 111595172A
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- 239000003245 coal Substances 0.000 title claims abstract description 28
- 239000000126 substance Substances 0.000 title claims abstract description 24
- 238000005516 engineering process Methods 0.000 title claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 106
- 238000000034 method Methods 0.000 claims abstract description 69
- 230000008569 process Effects 0.000 claims abstract description 68
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 239000003507 refrigerant Substances 0.000 claims description 41
- 239000000498 cooling water Substances 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 7
- 230000008676 import Effects 0.000 claims 1
- 239000002925 low-level radioactive waste Substances 0.000 abstract description 18
- 238000005057 refrigeration Methods 0.000 description 14
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000003889 chemical engineering Methods 0.000 description 2
- 238000001311 chemical methods and process Methods 0.000 description 2
- 239000003949 liquefied natural gas Substances 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
- F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
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- 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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
-
- 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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/08—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using ejectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention provides a coal chemical industry process steam condensate energy cascade utilization system which comprises a closed condensed water recovery unit, an injection type refrigerating unit, a hot water heat exchange unit, a process refrigerating unit and a cold water heat exchange unit, wherein the closed condensed water recovery unit is connected with the injection type refrigerating unit, the injection type refrigerating unit is respectively connected with the hot water heat exchange unit and the heat exchange refrigerating unit which are arranged in parallel, and the heat exchange refrigerating unit comprises the cold water heat exchange unit and the process refrigerating unit which are sequentially connected. The energy cascade utilization system for the steam condensate of the coal chemical industry process can further utilize low-level waste heat, improve the efficiency of a process refrigerating unit, reduce the operation cost of the process system, save energy and protect environment.
Description
Technical Field
The invention belongs to the technical field of energy conservation of coal chemical industry processes, and particularly relates to a gradient utilization system for steam condensate energy of a coal chemical industry process.
Background
The waste heat resource is considered as the fifth conventional energy source after coal, oil, natural gas and water power, and is also the key object of industrial energy conservation. At present, the utilization rate of high-temperature waste heat is low in China. Such problems are more pronounced in several typical sections of a coal chemical project, such as shift, conversion, methanol synthesis, methane synthesis, ammonia synthesis, multi-stage compression, etc. The high-temperature waste heat is primarily utilized to form low-temperature waste heat which mostly exists in the form of saturated steam condensate, and then the steam condensate is cooled by a water cooling or air cooling mode. The technical bottlenecks of turning waste into wealth, reducing production cost, improving energy utilization efficiency and the like are the straight-faced difficult problems required by engineering projects.
While a large amount of low-level waste heat is generated in coal chemical engineering projects, some working sections such as low-temperature methanol washing, LNG (liquefied natural gas), ammonia synthesis and the like are accompanied with a large amount of cold energy requirements, a large amount of high-grade steam or electric power needs to be consumed, and the optimization control of the cooling water temperature has positive significance for the reduction of the comprehensive energy consumption of a refrigerating unit and a cooling tower. According to the literature report, under the condition of certain refrigeration capacity, the temperature of cooling water rises by 1 ℃, the load of a motor of a water chilling unit rises by 1.6%, the refrigeration efficiency of the unit is reduced, and the COP is reduced by 4%.
If the low-level waste heat generated by the coal chemical engineering project can be utilized for refrigeration, the temperature of the cooling water of the process refrigerating unit is reduced, the efficiency of the process refrigerating unit is undoubtedly improved, and the energy conservation of the original process refrigerating system is realized while the low-level waste heat is utilized. Meanwhile, in northern areas, after low-level waste heat is used for refrigeration, hot water can be further prepared for heating in winter or heat tracing.
In addition, the jet refrigerating unit does not relate to other moving parts except for the working medium pump, working steam and a refrigerant in the system are the same substance, refrigerant separation equipment similar to a lithium bromide absorption refrigerating machine is not needed, and the jet refrigerating unit has the advantages of simple structure, less power consumption, small occupied area and the like, and can be undoubtedly the first choice of low-level waste heat refrigeration.
Disclosure of Invention
In view of the above, the invention aims to provide a gradient utilization system for steam condensate energy in a coal chemical process, so as to further utilize low-level waste heat, improve the efficiency of a process refrigerating unit, reduce the operation cost of a process system, save energy and protect environment.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the closed condensed water recovery unit is connected with the jet type refrigerating unit, the jet type refrigerating unit is respectively connected with the hot water heat exchange unit and the heat exchange refrigerating unit which are arranged in parallel, and the heat exchange refrigerating unit comprises the cold water heat exchange unit and the process refrigerating unit which are connected in sequence. .
The system can further utilize low-level waste heat, improve the efficiency of the process refrigerating unit, reduce the operation cost of the process system, save energy and protect environment.
The energy in the process steam condensate is fully recovered while the temperature of the cooling water of the process refrigerating system is reduced and the efficiency of the process refrigerating unit is improved.
Furthermore, the closed condensate recovery unit comprises a condensate tank and a condensate pump which are connected in sequence, wherein the condensate tank is connected with a condensate inlet of an external process, and the condensate pump is connected with a water outlet of the closed condensate recovery unit.
Furthermore, the injection type refrigerating unit comprises a first generator, a first evaporator and a first condenser which are arranged in parallel, and further comprises an ejector, wherein a first inlet of the ejector is connected with a refrigerant outlet of the first generator, a second inlet of the ejector is connected with a refrigerant outlet of the first evaporator, and an outlet of the ejector is connected with a refrigerant inlet of the first condenser.
Furthermore, a refrigerant outlet of the first condenser is connected with a refrigerant inlet of the first evaporator after passing through a throttling valve, and a refrigerant outlet of the first condenser is connected with a refrigerant inlet of the first generator after passing through a working medium pump.
Furthermore, a cold water inlet of the first condenser is connected with an external cooling water inlet, and a cold water outlet of the first condenser is connected with an external cooling water outlet.
Furthermore, a condensate inlet of the first generator is connected with a water outlet of the closed condensate recovery unit, and a condensate outlet of the first generator is connected with the hot water heat exchanger unit.
Furthermore, the hot water heat exchanger unit comprises a first water heat exchanger, a condensate inlet of the first water heat exchanger is connected with a condensate outlet of the first generator, a condensate outlet of the first water heat exchanger is connected with an external process condensate outlet, a heat exchange water inlet of the first water heat exchanger is connected with an external hot water return port, and a heat exchange water outlet of the first water heat exchanger is connected with an external hot water supply port.
Furthermore, the hot water heat exchanger unit also comprises a bypass valve, wherein a liquid inlet of the bypass valve is connected with a condensate outlet of the first generator, and a liquid outlet of the bypass valve is connected with an external process condensate outlet.
After the low-level waste heat is used for refrigeration, hot water can be further prepared for heating in winter or heat tracing, the low-level waste heat is further utilized, and the heat utilization rate is high.
The cascade utilization of low-level waste heat changes waste into valuable, improves the energy utilization efficiency, reduces the production cost and brings huge economic benefits to enterprises.
Further, the process refrigerating unit comprises a second evaporator and a second condenser 43 which are arranged in parallel, a refrigerant outlet of the second evaporator is connected with a refrigerant inlet of the second condenser after passing through the compressor, a refrigerant outlet of the second condenser is connected with a refrigerant inlet of the first evaporator after passing through the expansion valve, a medium inlet of the second evaporator is connected with a cold medium inlet for external process, and a medium outlet of the second evaporator is connected with a cold medium outlet for external process.
The cooling water in the second condenser is lower than the temperature of the common cooling water, so that the efficiency of the process refrigerating unit is improved, and the operation cost is reduced.
Furthermore, the cold water heat exchanger unit comprises a second water heat exchanger and a cold water pump which are connected in sequence, the cold water pump is connected with a cold water inlet of the first evaporator, the second water heat exchanger is connected with a cold water outlet of the first evaporator, a cold water outlet of the second water heat exchanger is connected with a cooling water inlet of the second condenser, a cooling water outlet of the second condenser is connected with an external cooling water outlet, and a cooling water inlet of the second water heat exchanger is connected with an external cooling water inlet.
Compared with the prior art, the coal chemical industry process steam condensate energy cascade utilization system has the following advantages:
(1) the energy cascade utilization system for the steam condensate of the coal chemical industry process can further utilize low-level waste heat, improve the efficiency of a process refrigerating unit, reduce the operation cost of the process system, save energy and protect environment.
(2) The energy gradient utilization system for the steam condensate of the coal chemical industry process can fully recover the energy in the steam condensate of the process while reducing the temperature of the cooling water of the process refrigeration system and improving the efficiency of the process refrigeration unit.
(3) According to the energy cascade utilization system for the steam condensate in the coal chemical industry process, after low-level waste heat is used for refrigeration, hot water can be further prepared for heating or heat tracing in winter, the low-level waste heat is further utilized, and the heat utilization rate is high.
(4) The energy cascade utilization system for the steam condensate of the coal chemical industry process, disclosed by the invention, realizes cascade utilization of low-level waste heat, changes waste into valuable, improves the energy utilization efficiency, reduces the production cost and brings huge economic benefits to enterprises.
(5) The energy cascade utilization system for the steam condensate in the coal chemical industry process adopts the jet type refrigerating unit for refrigeration, saves occupied land and has little influence on process arrangement.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
fig. 1 is a schematic diagram of a system for gradient utilization of energy of steam condensate in a coal chemical process according to an embodiment of the present invention.
Description of reference numerals:
1-closed condensed water recovery unit; 11-a condensate tank; 12-a condensate pump; 2-a jet-type refrigeration unit; 21-an ejector; 22-a first generator; 23-a first evaporator; 24-a first condenser; 25-a throttle valve; 26-a working medium pump; 3-hot water heat exchanger group; 31-a hot water pump; 32-a first water-water heat exchanger; 33-a bypass valve; 4-process refrigerating unit; 41-a second evaporator; 42-a compressor; 43-second condenser 43; 44-an expansion valve; 45-use the cold medium pump; 5-a cold water heat exchanger unit; 51-cold water pump; 52-a second water-water heat exchanger;
a-a process condensate water inlet; b-hot water supply port; c, a hot water return port; d, a process condensate water outlet; e-a cold medium inlet for the process; f-a cold medium outlet for the process; g-a cooling water inlet; h-a cooling water outlet.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Unless otherwise specifically stated or limited, the term "fixedly connected" may be a commonly used fixedly connected manner such as a plug, a weld, a threaded connection, a bolt connection, etc. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
As shown in the figure, when the system is initially operated, the cooling water circulation system, the cold medium pump 45, the hot water pump 31 and the cold water pump 51 are started; and secondly, opening a closed condensed water recovery unit 1, an injection type refrigerating unit 2, a hot water heat exchange unit 3, a process refrigerating unit 4 and a cold water heat exchange unit 5.
Steam condensate (generally about 150 ℃) from different process devices of an outer pipe network enters the closed condensate recovery unit 1 from an external process condensate water inlet A, is collected by a condensate tank 11 and pressurized by a condensate pump 12, and is conveyed to the jet type refrigerating unit 2. The steam condensate enters the hot water heat exchanger unit 3 after being subjected to heat exchange and temperature reduction to about 105 ℃ in the first generator 22.
In the heating season, the steam condensate enters the first water-water heat exchanger 32 after the heat exchange and temperature reduction of the first generator 22 and is continuously subjected to heat exchange and temperature reduction to about 80 ℃, and the steam condensate after the secondary temperature reduction flows out of the process condensate water outlet D and is collected. The first water-water heat exchanger 32 is used for heating the hot water return water (generally about 70 ℃) from the outer pipe network, the hot water return water is pressurized by the hot water pump 31, then is heated to about 95 ℃ in the first water-water heat exchanger 32, then flows out from the hot water supply port B, and is supplied to the outer pipe network as hot water supply. The heated hot water can be used as hot water for daily life.
After the low-level waste heat is used for refrigeration, hot water can be further prepared for heating in winter or heat tracing, the low-level waste heat is further utilized, and the heat utilization rate is high.
The cascade utilization of low-level waste heat changes waste into valuable, improves the energy utilization efficiency, reduces the production cost and brings huge economic benefits to enterprises.
In non-heating seasons, the steam condensate directly flows out of the process condensate water outlet D after passing through the bypass valve 33 after heat exchange and temperature reduction of the first generator 22 and is collected without passing through the first water-water heat exchanger 32.
The cooling water from the outer pipe network is divided into two paths: one path flows through the first condenser 24 to be used as cooling water for the ejector-type refrigerator group 2; the other path passes through a second water-water heat exchanger 52, exchanges heat with cold water from the first evaporator 23, and is used as cooling water in a second condenser 43 of the process refrigerating unit 4 after being cooled to an optimal cooling temperature point.
The internal refrigerant circulation system of the ejector-type refrigeration unit 2: the gaseous refrigerant is sprayed out from the outlet of the ejector 21 and flows into the first condenser 24, the gaseous refrigerant is cooled by cooling water of the outer net in the first condenser 24 and then condensed into liquid refrigerant of about 45-50 ℃, and at the moment, the temperature of the cooling water is increased from about 30-35 ℃ to about 35-40 ℃.
After the liquid refrigerant flows out of the first condenser 24, one strand of the liquid refrigerant enters the first generator 22 after being pressurized by the working medium pump 26, is converted into high-temperature and high-pressure refrigerant steam at the temperature of about 78-100 ℃ by heat exchange with condensate in the first generator 22, and then enters the ejector 21; the other part of the refrigerant enters the first evaporator 23 after passing through the throttle valve 25, the phase change is carried out in the first evaporator 23, the refrigerant becomes low-temperature low-pressure refrigerant steam with the temperature of about 0 to 4 ℃, the low-temperature low-pressure refrigerant steam is injected into the injector 21 by the injector 21, and then enters the first condenser 24 to enter the next cycle.
The heat absorption is needed when the gas-liquid phase change occurs in the first evaporator 23, the heat comes from cold water flowing into the first evaporator 23 from a cold water pump 51 (at the beginning, the cold water pump 51 is connected with an external network to inject cold water, and the cold water circulates in the system after a period of time), the cold water is cooled to about 7 ℃ in the first evaporator 23, then flows into a second water-water heat exchanger 52, exchanges heat with the cooling water from the external network in the second water-water heat exchanger 52, is heated to about 12 ℃, then circulates into the first evaporator 23, and the cooling water after exchanging heat and cooling in the second water-water heat exchanger 52 flows into a second condenser 43 to be used as cooling water.
The cooling water in the second condenser 43 is now at a lower temperature than the usual cooling water, which improves the efficiency of the process refrigeration unit 4 and reduces the operating costs.
Internal refrigerant circulating system of the process refrigerating unit 4: the refrigerant vapor flows out of the second evaporator 41, is pressurized by the compressor 42, enters the second condenser 43, is cooled in the second condenser 43 to be refrigerant condensate, and the refrigerant condensate is throttled by the expansion valve 44, enters the first evaporator 23, is gasified, and then enters the next cycle. At the same time, the process refrigerant from the outer pipe network is cooled by the second evaporator 41 of the process refrigerator group 4 and is pressurized by the refrigerant pump 45 and returned to the outer pipe network.
After production is over, the shutdown operation is reversed from the initial operation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (10)
1. A coal chemical industry technology steam condensate energy cascade utilization system which characterized in that: the closed type condensed water recovery unit (1) is connected with the jet type refrigerating unit (2), the jet type refrigerating unit (2) is connected with the hot water heat exchange unit (3) and the heat exchange refrigerating unit which are arranged in parallel, and the heat exchange refrigerating unit comprises the cold water heat exchange unit (5) and the process refrigerating unit (4) which are connected in sequence.
2. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 1, wherein: the closed condensate recovery unit (1) comprises a condensate tank (11) and a condensate pump (12) which are connected in sequence, wherein the condensate tank (11) is connected with an external process condensate water inlet (A), and the condensate pump (12) is connected with a water outlet of the closed condensate recovery unit (1).
3. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 1, wherein: the injection type refrigerating unit (2) comprises a first generator (22), a first evaporator (23) and a first condenser (24) which are arranged in parallel, and further comprises an ejector (21), wherein a first inlet of the ejector (21) is connected with a refrigerant outlet of the first generator (22), a second inlet of the ejector (21) is connected with a refrigerant outlet of the first evaporator (23), and an outlet of the ejector (21) is connected with a refrigerant inlet of the first condenser (24).
4. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 3, wherein: and a refrigerant outlet of the first condenser (24) is connected with a refrigerant inlet of the first evaporator (23) after passing through a throttling valve (25), and a refrigerant outlet of the first condenser (24) is connected with a refrigerant inlet of the first generator (22) after passing through a working medium pump (26).
5. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 3, wherein: and a cold water inlet of the first condenser (24) is connected with an external cooling water inlet (G), and a cold water outlet of the first condenser (24) is connected with an external cooling water outlet (H).
6. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 3, wherein: and a condensate inlet of the first generator (22) is connected with a water outlet of the closed condensate recovery unit (1), and a condensate outlet of the first generator (22) is connected with the hot water heat exchanger unit (3).
7. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 3, wherein: the hot water heat exchange unit (3) comprises a first water heat exchanger (32), a condensate inlet of the first water heat exchanger (32) is connected with a condensate outlet of the first generator (22), a condensate outlet of the first water heat exchanger (32) is connected with an external process condensate water outlet (D), a heat exchange water inlet of the first water heat exchanger (32) is connected with an external hot water return port (C), and a heat exchange water outlet of the first water heat exchanger (32) is connected with an external hot water supply port (B).
8. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 7, wherein: the hot water heat exchanger unit (3) further comprises a bypass valve (33), a liquid inlet of the bypass valve (33) is connected with a condensate outlet of the first generator (22), and a liquid outlet of the bypass valve (33) is connected with an external process condensate outlet (D).
9. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 3, wherein: the process refrigerating unit (4) comprises a second evaporator (41) and a second condenser (43) which are arranged in parallel, a refrigerant outlet of the second evaporator (41) is connected with a refrigerant inlet of the second condenser (43) after passing through a compressor (42), a refrigerant outlet of the second condenser (43) is connected with a refrigerant inlet of the first evaporator (23) after passing through an expansion valve (44), a medium inlet of the second evaporator (41) is connected with an external process cold medium inlet (E), and a medium outlet of the second evaporator (41) is connected with an external process cold medium outlet (F).
10. The system for cascade utilization of steam condensate energy in a coal chemical industry process according to claim 9, wherein: the cold water heat exchanger group (5) is including the second water heat exchanger (52), the cold water pump (51) that connect gradually, cold water pump (51) with the cold water access connection of first evaporimeter (23), second water heat exchanger (52) with the cold water exit linkage of first evaporimeter (23), the cold water export of second water heat exchanger (52) with the cooling water access connection of second condenser (43), the cooling water export and the outside cooling water delivery port (H) of second condenser (43) are connected, and the cooling water import and the outside cooling water inlet (G) of second water heat exchanger (52) are connected.
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| CN202010580479.6A CN111595172A (en) | 2020-06-23 | 2020-06-23 | Coal chemical industry technology steam condensate energy cascade utilization system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325356A (en) * | 2020-11-03 | 2021-02-05 | 中国矿业大学 | Steam heating system and method for recovering waste heat of condensed water of heating pipe based on ejector |
| CN113280524A (en) * | 2021-05-31 | 2021-08-20 | 哈尔滨工业大学 | Large temperature difference heat exchange system provided with multiple ejectors |
| CN113526525A (en) * | 2021-06-29 | 2021-10-22 | 福州大学化肥催化剂国家工程研究中心 | Synthetic ammonia tower and renewable energy source synthetic ammonia system with waste heat step recovery |
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