CN113856227A - MVR heat pump system with low-temperature evaporation and low-pressure steam recycling functions - Google Patents
MVR heat pump system with low-temperature evaporation and low-pressure steam recycling functions Download PDFInfo
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- CN113856227A CN113856227A CN202111157275.2A CN202111157275A CN113856227A CN 113856227 A CN113856227 A CN 113856227A CN 202111157275 A CN202111157275 A CN 202111157275A CN 113856227 A CN113856227 A CN 113856227A
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- 238000001704 evaporation Methods 0.000 title claims abstract description 46
- 230000008020 evaporation Effects 0.000 title claims abstract description 41
- 238000004064 recycling Methods 0.000 title abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 40
- 239000000243 solution Substances 0.000 claims abstract description 31
- 239000012266 salt solution Substances 0.000 claims abstract description 30
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims abstract description 27
- 229960001545 hydrotalcite Drugs 0.000 claims abstract description 27
- 229910001701 hydrotalcite Inorganic materials 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims description 19
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 24
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 18
- 229910001629 magnesium chloride Inorganic materials 0.000 description 12
- 239000007789 gas Substances 0.000 description 11
- 229910021529 ammonia Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- -1 salt anions Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000012265 solid product Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- WCUQNDYMZCICMD-UHFFFAOYSA-N N.[O--].[Mg++] Chemical compound N.[O--].[Mg++] WCUQNDYMZCICMD-UHFFFAOYSA-N 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
- B01D1/2896—Control, regulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a heat pump system, in particular to a MVR heat pump system for low-temperature evaporation and low-pressure steam recycling, which comprises: the system comprises a system hot water tank and a magnesium salt solution tank, wherein a lower outlet of the system hot water tank is connected with an upper shell pass inlet of a first heat exchanger through a hot water pump, a lower outlet of the magnesium salt solution tank is connected with a lower tube pass inlet of the first heat exchanger through a magnesium salt solution pump, an upper tube pass outlet of the first heat exchanger is connected with a lower tube pass inlet of a second heat exchanger through a first material pump, an upper tube pass outlet of the second heat exchanger is connected with an upper solution inlet of an evaporator through a pipeline, and a lower shell pass steam inlet of the evaporator is connected with a steam outlet of a centrifugal compressor through a pipeline; the MVR heat pump system can fully utilize steam generated by evaporation of the magnesium salt dilute solution, and is economical and environment-friendly; the heat of steam, high-temperature gas and condensed water generated by the hydrotalcite system is fully utilized as the heat source of the system, so that the energy is saved and the environment is protected.
Description
Technical Field
The invention relates to the technical field of chemical equipment, relates to a heat pump system, and particularly relates to a low-temperature evaporation and low-pressure steam recycling MVR heat pump system.
Background
Along with the industrialized development, the society has more and more extensive energy requirements, particularly, the evaporation process has more and more requirements on steam, in order to save steam, a primary steam multi-effect evaporation process is adopted, the heat of the steam is better utilized, but the primary steam is consumed more, the exhaust of coal-fired tail gas is amplified, and the environment is polluted; the multiple-effect evaporation equipment is more, the investment is large, and the operation is complicated. In recent years, with the popularization of MVR heat pump technology, the application of the MVR heat pump technology is more and more extensive, with the progress of social science and technology, the ways of acquiring energy by human beings are more and more, the tail gas emission is reduced by adopting electric energy to replace coal, and the ways of converting the electric energy into the heat energy are gradually increased by adopting an MVR heat pump system to carry out low-temperature evaporation, so that the MVR heat pump technology is clean and convenient, and the cost is saved.
Along with the synthesis of hydrotalcite in an ammonia process production hydrotalcite process system, raw material salt anions and ammonium form ammonium salt, the magnesium oxide ammonia evaporation method is adopted to recycle ammonia, a large amount of low-concentration magnesium salt solutions such as magnesium chloride, magnesium nitrate, magnesium sulfate and the like are inevitably generated, and the low-concentration salt solutions are required to be recycled for environmental protection and are not discharged outside, so that the low-concentration salt solutions are required to be concentrated and evaporated to be solid products for recycling or selling. The concentration and evaporation of the solution require a large amount of steam, so the energy required for realizing the evaporation of the magnesium salt dilute solution by adopting an MVR heat pump technology is considered.
Disclosure of Invention
The invention provides a low-temperature evaporation and low-pressure steam recycling MVR heat pump system to solve the problems in the prior art, and aims to solve the technical problems at present.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a low-temperature evaporation and low-pressure steam recycling MVR heat pump system, which comprises: the system comprises a system hot water tank and a magnesium salt solution tank, wherein a lower outlet of the system hot water tank is connected with an upper shell pass inlet of a first heat exchanger through a hot water pump, a lower outlet of the magnesium salt solution tank is connected with a lower tube pass inlet of the first heat exchanger through a magnesium salt solution pump, an upper tube pass outlet of the first heat exchanger is connected with a lower tube pass inlet of a second heat exchanger through a first material pump, an upper tube pass outlet of the second heat exchanger is connected with an upper solution inlet of an evaporator through a pipeline, and a lower shell pass steam inlet of the evaporator is connected with a steam outlet of a centrifugal compressor through a pipeline.
Preferably, the upper steam outlet of the evaporator is connected with the side inlet of the cyclone gas-liquid separator, and the upper outlet of the evaporator is simultaneously connected with an exhaust fan for exhausting non-condensable gas in the initial stage. The upper outlet of the cyclone gas-liquid separator is connected with the lower side inlet of the demister, the upper outlet of the demister is divided into two paths, one path is connected with the steam inlet of the centrifugal compressor, and the other path is connected with the steam outlet of the centrifugal compressor.
Preferably, the lower outlet of the cyclone gas-liquid separator, the lower outlet of the demister and the upper hot solution outlet of the second heat exchanger are connected to the upper solution inlet of the tube side of the evaporator through pipelines.
Preferably, a steam outlet of the centrifugal compressor is connected to a lower shell-side steam inlet of the evaporator through a pipeline, a shell-side outlet of the evaporator is connected to an upper-side inlet of the condensate water tank, and a lower outlet of the condensate water tank is connected to an inlet of the condensate pump.
Preferably, the outlet of the condensate pump is divided into two paths, one path is connected with the lower shell pass inlet of the second heat exchanger, and the other path is connected with the cooling water inlet of the centrifugal compressor.
Preferably, the upper steam outlet of the condensed water tank is connected with the inlet of the cyclone gas-liquid separator through a pipeline.
Preferably, a steam inlet of the centrifugal compressor is connected with an upper steam outlet of the steam generator through a pipeline, a lateral upper inlet of the steam generator is connected with a steam pipeline through which two paths of high-temperature steam circulate, one path is externally-discharged low-pressure steam, and the other path is primary steam. And the lower side part of the steam generator is connected with a hot gas pipeline which is arranged outside the hydrotalcite system. And the side part of the steam generator is connected with a hot water pipeline which is arranged outside the hydrotalcite system.
The invention has the beneficial effects that:
(1) the MVR heat pump system can fully utilize steam generated by evaporation of the magnesium salt dilute solution, and is economical and environment-friendly.
(2) The heat of steam, high-temperature gas and condensed water generated by the hydrotalcite system is fully utilized as the heat source of the system, so that the system is more energy-saving and environment-friendly.
(3) The steam generator system utilizes the waste heat of the hydrotalcite system to be used as a starting energy source of the MVR system and also be used as an auxiliary energy source of the evaporation system, so that the system balance can be realized, and the heat energy of the system can be more fully utilized.
(4) The whole device has the advantages of simple process, less equipment, convenient operation, safety and environmental protection.
Drawings
The foregoing aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a low temperature evaporation and low pressure vapor reuse MVR heat pump system according to an embodiment of the present invention.
Description of reference numerals:
in fig. 1, a system hot water tank 1; a magnesium salt solution tank 2; a hot water pump 3; a magnesium salt solution pump 4; a first heat exchanger 5; a first material pump 6; a warm water pump 7; a second heat exchanger 8; a second material pump 9; a condensate tank 10; a condensate pump 11; an exhaust fan 12; an evaporator 13; a cyclone gas-liquid separator 14; a demister 15; a centrifugal compressor 16; a steam generator 17.
Detailed Description
The technical solutions in 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 obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a low-temperature evaporation and low-pressure steam recycling MVR heat pump system, which utilizes a centrifugal compressor 16 to recompress steam generated by solution evaporation, so that electric energy is converted into heat energy and static pressure energy for evaporation of a system, and self circulation of an evaporation system is realized.
The hydrotalcite production system is from reaction, crystallization to product drying and calcination, and each step needs steam and other heat sources for heating, secondary steam after heat exchange enters a low-pressure steam pipe network or is converted into condensed water for external use, and steam generated by hydrotalcite dehydration with high water content or high-temperature gas generated by decomposition can be used as a starting heat source of an MVR heat pump system to provide heat energy for an evaporator. The steam can be used as the steam balance of the system, so that the whole heat energy of the system is more fully utilized. Meanwhile, condensed water recovered by the hydrotalcite system can be used for preheating magnesium salt solution entering the MVR system, and the waste heat of the system is recovered.
The ammonia-containing waste liquid generated in the ammonia-method hydrotalcite production system is evaporated with magnesium oxide to obtain a magnesium salt dilute solution accompanied by ammonia evaporation, the magnesium salt dilute solution is evaporated, concentrated and crystallized to separate out a solid product, low-pressure steam or discharged high-temperature gas generated in the hydrotalcite system is used as an initial heat source of the MVR heat pump, the generated steam is used for evaporating magnesium salts, the steam generated in the evaporation of magnesium salts is returned to the centrifugal compressor 16 for further compression, the temperature and the pressure are increased, the magnesium salts are evaporated, and the steps are repeated. Meanwhile, the steam provided by the steam generator can also be used as the balance steam of the MVR heat pump system, when the heat energy provided by the steam generator is more, the more evaporation amount of the evaporator 13 can be directly sent to the inlet pipeline of the compressor by using the shunt pipeline at the outlet of the demister 15, so that the balance of the MVR system is realized.
The magnesium salt dilute solution entering the MVR heat pump evaporation system utilizes the condensed water generated by the hydrotalcite system to carry out primary heat exchange, fully utilizes the heat energy of the condensed water generated by the hydrotalcite system, then utilizes the condensed water of the MVR heat pump system evaporator to carry out secondary heat exchange, fully utilizes the heat energy of the condensed water of the MVR heat pump system evaporator, and then enters the evaporator to evaporate, so that the heat energy of the system is fully utilized.
The hydrotalcite system can adopt magnesium chloride as a raw material, adopts an ammonia method to produce hydrotalcite, generates a mother solution which is a dilute ammonium chloride solution, adopts magnesium oxide as an ammonia evaporation raw material for recycling ammonia and reducing salt discharge, and adopts the dilute magnesium chloride solution after ammonia evaporation to evaporate and concentrate and recycle magnesium chloride, so that the MVR heat pump evaporation system is designed and adopted.
An upper inlet of the system hot water tank 1 is connected with a hot water pipeline, and a lower outlet of the system hot water tank is connected with an upper shell pass inlet of a first heat exchanger 5 through a hot water pump 3. The upper inlet of the magnesium salt solution tank 2 is connected with a magnesium salt solution pipeline, the magnesium salt solution pipeline is used for conveying magnesium salt solution to the magnesium salt solution tank 2, and the lower outlet of the magnesium salt solution tank 2 is connected with the lower pipe side inlet of the first heat exchanger 5 through a magnesium salt solution pump 4. The lower shell side outlet of the first heat exchanger 5 is discharged or stored by a warm water pump 7 for recycling. An upper tube pass outlet of the first heat exchanger 5 is connected with a lower tube pass inlet of the second heat exchanger 8 through a first material pump 6, and an upper tube pass outlet of the second heat exchanger 8 is connected with an upper solution inlet of the evaporator 13 through a pipeline; the lower shell side steam inlet of the evaporator 13 is connected with the steam outlet of the centrifugal compressor 16 through a pipeline, and the lower tube side outlet of the evaporator 13 is conveyed to a magnesium chloride solution re-evaporation concentration crystallization system through the second material pump 9; the magnesium chloride solution re-evaporation concentration crystallization system is a system for magnesium chloride evaporation crystallization, and can adopt the prior art, the upper steam outlet of the evaporator 13 is connected with the side inlet of the cyclone gas-liquid separator 14, the upper outlet of the cyclone gas-liquid separator 14 is connected with the lower side inlet of the demister 15, the upper outlet pipeline of the demister 15 is divided into two paths, one path is connected with the steam inlet of the centrifugal compressor 16, and the other path is connected with the steam outlet of the centrifugal compressor 16; the lower outlet of the cyclone gas-liquid separator 14, the lower outlet of the demister 15 and the upper hot solution outlet of the second heat exchanger 8 are connected together through pipelines to the upper solution inlet of the tube side of the evaporator 13. The vapor outlet of the centrifugal compressor 16 is connected by a line to the lower shell-side vapor inlet of the evaporator 13. The shell pass outlet of the evaporator 13 is connected with the upper measuring part inlet of the condensed water tank 10, the lower part outlet of the condensed water tank 10 is connected with the inlet of the condensed water pump 11, the outlet of the condensed water pump 11 is divided into two paths, one path is connected with the lower part shell pass inlet of the second heat exchanger 8, and the other path is connected with the cooling water inlet of the centrifugal compressor 16. And an upper shell pass outlet of the second heat exchanger 8 is connected with a pipeline for discharging condensed water outwards, and the condensed water can be recycled. The upper steam outlet of the condensed water tank 10 is connected with the inlet of the cyclone gas-liquid separator 14 through a pipeline. As a starting energy source, a side upper part inlet of the steam generator 17 is connected with a steam pipeline in which high-temperature steam flows, a side lower part inlet is connected with a hot gas pipeline which is externally discharged by the hydrotalcite system, and an upper part steam outlet of the steam generator 17 is connected with a steam inlet of the centrifugal compressor 16 and is used as starting steam of the MVR system. The steam inlet pipeline of the steam generator 17 is divided into two paths, one path is the discharged low-pressure steam of the hydrotalcite system, and the other path is primary steam for standby and regulation. The discharged tail gas of the recovered steam and hydrotalcite system is used as a heat source, on one hand, the heat source can be used as a starting heat source of an MVR heat pump system, and also can be used as a system balance heat source. The hot water pipeline of the hydrotalcite system entering the MVR system is divided into two paths, one path is connected with the upper hot water inlet of the MVR system hot water tank 1, and the other path is connected with the lateral hot water inlet of the steam generator 17 and used as hot water for supplementing water.
The hot water tank 1, the magnesium salt solution tank 2 and the condensed water tank 10 of the system in the application document are all metal storage tanks, metal pipelines can be selected for the pipelines, the cyclone gas-liquid separator 14 is a cyclone separator for gas-liquid separation, and the hot water pump 3, the magnesium salt solution pump 4, the first material pump 6, the warm water pump 7, the second material pump 9 and the condensed water pump 11 are common water pumps in the market.
The system devices are connected as shown in the attached drawings. The magnesium salt solution entering the MVR heat pump evaporation system is sent into a magnesium salt solution tank 2 and sent to a lower tube pass inlet of a first heat exchanger 5 by a magnesium salt solution pump 4; condensed water from a hydrotalcite system enters a hot water tank 1 of an MVR system, is sent to an upper shell pass inlet of a first heat exchanger 5 by a hot water pump 3, and a magnesium salt dilute solution subjected to primary heat exchange is sent to a lower tube pass inlet of a second heat exchanger 8 by a first material pump 6; the warm water after the primary heat exchange is discharged by a warm water pump 7 or sent into a warm water tank for recycling. The primarily heated magnesium salt solution is secondarily heated by the tube pass steam condensate of the MVR heat pump evaporator 13 in the tube pass of the second heat exchanger 8, then enters the upper tube pass inlet of the evaporator 13, is heated and evaporated by the steam entering from the middle lower part in the evaporator 13, the generated steam enters the side inlet of the cyclone gas-liquid separator 14 from the upper outlet, and the evaporated concentrated solution is sent into a magnesium chloride solution re-evaporation concentration crystallization system by the second material pump 9 to prepare a magnesium salt product. The steam entering the evaporator 13 is condensed by heat exchange and then enters the condensed water tank 10 from the lower shell pass outlet of the evaporator 13, and is sent out by the condensed water pump 11 and then divided into two paths, wherein one path is sent to the secondary heat exchanger 8 as a heat source, and the other path is sent to the cooling water inlet of the centrifugal compressor 16 as cooling water supplement. The steam evaporated by the evaporator 13 enters the cyclone gas-liquid separator 14, the steam after cyclone separation is sent out from the upper part and enters the inlet at the lower side part of the foam catcher 14, and the steam after foam catching enters the steam inlet of the centrifugal compressor 16 from the outlet at the upper part of the foam catcher. The magnesium salt solution separated by the cyclone gas-liquid separator 14 and the mist eliminator 14 is discharged from the bottom and enters the side tube-side solution inlet of the evaporator 13. The vapor evaporated in the evaporator 13 is compressed by a centrifugal compressor 16 and then sent to the evaporator as an evaporation heat source. As a starting heat source, a steam generator 17 is provided. And steam or discharged high-temperature gas generated by the hydrotalcite system can be used as a heat source, and other heat sources or primary steam can be used as a heat source for starting and balancing the MVR heat pump evaporation system.
Dilute magnesium chloride solution with concentration of about 8-10% and temperature of 40-50 ℃ after ammonia evaporation and filtration enters a magnesium salt solution tank 2 of an MVR heat pump evaporation system; condensed water from a hydrotalcite system enters a hot water tank 1 of an MVR system, the temperature is about 60-80 ℃, and the magnesium chloride dilute solution after primary heating is subjected to secondary heating in a tube pass of a second heat exchanger 8 by steam condensed water of which the tube pass temperature of an evaporator 13 is more than 85 ℃ until the temperature is more than 70 ℃. After the magnesium chloride solution is sent into the evaporator 13, the magnesium chloride dilute solution is evaporated at low temperature due to a vacuum system formed by the operation of a compressor, and the generated steam is recycled.
The MVR heat pump system can fully utilize steam generated by evaporation of the magnesium salt dilute solution, and is economical and environment-friendly. Meanwhile, the system makes full use of the heat of steam, high-temperature gas and condensed water generated by the hydrotalcite system as the starting and balance heat sources of the system, and on the basis of making full use of the heat energy of the hydrotalcite, because the outlet steam shunt pipeline of the demister 15 for the steam outlet at the upper part of the centrifugal compression molding machine 15 is added, the self-balance of the MVR system can be easily realized on the basis of better utilizing the heat energy of the hydrotalcite system, and the operation is easier. The method disclosed by the invention realizes comprehensive utilization of heat energy, and is more energy-saving and environment-friendly. The whole device has the advantages of simple process, less equipment, convenient operation, safety and environmental protection.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. A low temperature evaporation and low pressure vapor reuse MVR heat pump system comprising: the system comprises a hot water tank and a magnesium salt solution tank, and is characterized in that: the system comprises a hot water tank, a magnesium salt solution tank, a first heat exchanger, a second heat exchanger, a centrifugal compressor, a hot water pump, a magnesium salt solution pump, a second heat exchanger, a first material pump, a second material pump, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger, a sixth heat exchanger, a fifth heat exchanger, a sixth heat exchanger, a fifth heat exchanger, a sixth heat exchanger, a fifth heat exchanger and a sixth heat exchanger.
2. The low temperature evaporation and low pressure vapor reuse MVR heat pump system of claim 1, wherein: the upper steam outlet of the evaporator is connected with the side inlet of the cyclone gas-liquid separator, and the upper outlet of the evaporator is simultaneously connected with the inlet of the exhaust fan and used for discharging noncondensable gas at the initial stage. The upper outlet of the cyclone gas-liquid separator is connected with the lower side inlet of the demister, the upper outlet pipeline of the demister is divided into two paths, one path is connected with the steam inlet of the centrifugal compressor, and the other path is connected with the outlet pipeline of the centrifugal compressor.
3. The low temperature evaporation and low pressure vapor reuse MVR heat pump system of claim 2, wherein: and the lower outlet of the cyclone gas-liquid separator, the lower outlet of the demister and the upper hot solution outlet of the second heat exchanger are connected to the upper solution inlet of the tube side of the evaporator through pipelines.
4. The low temperature evaporation and low pressure vapor reuse MVR heat pump system of claim 1, wherein: the steam outlet of the centrifugal compressor is connected with the lower shell pass steam inlet of the evaporator through a pipeline, the shell pass outlet of the evaporator is connected with the upper measuring part inlet of the condensed water tank, and the lower outlet of the condensed water tank is connected with the inlet of the condensed water pump.
5. The low temperature evaporation and low pressure vapor reuse MVR heat pump system of claim 4, wherein: the outlet of the condensed water pump is divided into two paths, one path is connected with the lower shell pass inlet of the second heat exchanger, and the other path is connected with the cooling water inlet of the centrifugal compressor.
6. The low temperature evaporation and low pressure vapor reuse MVR heat pump system of claim 4, wherein: and a steam outlet at the upper part of the condensed water tank is connected with an inlet of the cyclone gas-liquid separator through a pipeline.
7. The low temperature evaporation and low pressure vapor reuse MVR heat pump system of claim 1, wherein: the steam inlet of the centrifugal compressor is connected with the upper steam outlet of the steam generator through a pipeline, the inlet at the upper side of the steam generator is connected with a steam pipeline through which high-temperature steam flows, and the lower side of the steam generator is connected with a hot gas pipeline which is externally discharged by the hydrotalcite system.
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| CN202111157275.2A CN113856227A (en) | 2021-09-30 | 2021-09-30 | MVR heat pump system with low-temperature evaporation and low-pressure steam recycling functions |
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| CN202111157275.2A CN113856227A (en) | 2021-09-30 | 2021-09-30 | MVR heat pump system with low-temperature evaporation and low-pressure steam recycling functions |
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| CN215724280U (en) * | 2021-09-30 | 2022-02-01 | 泰安渤洋化工科技有限公司 | MVR heat pump system is recycled to low pressure steam |
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