CN113827997A - Mechanical vapor recompression heat pump rectification system - Google Patents
Mechanical vapor recompression heat pump rectification system Download PDFInfo
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- CN113827997A CN113827997A CN202010590778.8A CN202010590778A CN113827997A CN 113827997 A CN113827997 A CN 113827997A CN 202010590778 A CN202010590778 A CN 202010590778A CN 113827997 A CN113827997 A CN 113827997A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The embodiment of the invention relates to the technical field of rectification and evaporation, and provides a rectification system of a mechanical vapor recompression heat pump. The mechanical vapor recompression heat pump rectification system provided by the embodiment of the invention comprises: the system comprises a material preheating subsystem, a rectification subsystem and an evaporation subsystem, wherein an outlet of the material preheating subsystem is connected with an inlet of the rectification subsystem; an outlet of the rectification subsystem is connected with an inlet of the evaporation subsystem so as to discharge steam generated in the rectification process into the evaporation subsystem for heat exchange, and further condense the steam into liquid to be discharged into a finished product tank; the outlet of the evaporation subsystem is connected with the inlet of the material preheating subsystem, so that secondary steam generated in the evaporation process is compressed and then is used as a heat source for preheating materials in the material preheating subsystem. The mechanical vapor recompression heat pump rectification system provided by the embodiment of the invention solves the problems of difficult compressor type selection and high manufacturing cost of the traditional rectification tower top vapor direct compression heat pump rectification system.
Description
Technical Field
The invention relates to the technical field of rectification and evaporation, in particular to a rectification system of a mechanical vapor recompression heat pump.
Background
Rectification is an indispensable part in the production process of industries such as petroleum, chemical engineering and the like, and is also a main energy consumption link. The traditional process mainly adopts single-effect and double-effect rectification, has simple equipment and low investment, but needs a large amount of raw steam as a heat source in the whole process, has high system energy consumption, greatly increases the operation cost and brings huge challenges to the energy field.
Mvr (mechanical vapor compression) is a shorthand for mechanical vapor recompression technique. The MVR mechanical vapor recompression heat pump rectification technology effectively reduces the consumption of tower kettle heat public works and tower top cold public works by fully recycling tower top vapor, and is a prominent and effective energy-saving method. However, most of currently developed mechanical vapor recompression heat pump rectification processes adopt a form of directly compressing vapor at the top of a tower, and because the material concentration in the vapor is high and the vapor is directly contacted with a compressor, hidden troubles such as leakage, explosion, corrosion and the like exist in the compression process, so that the problems of difficulty in model selection of the compressor, high manufacturing cost and the like are caused, and the development of the mechanical vapor recompression heat pump rectification technology is also limited. Therefore, the design of a safe and efficient mechanical vapor recompression heat pump rectification system becomes a problem to be solved urgently.
Disclosure of Invention
In order to solve the problems of difficult compressor type selection and high manufacturing cost caused by direct compression of steam at the top of a rectifying tower in the prior art, the embodiment of the invention provides a mechanical steam recompression heat pump rectifying system.
According to one embodiment of the invention, a mechanical vapor recompression heat pump rectification system comprises: the system comprises a material preheating subsystem, a rectifying subsystem and an evaporating subsystem, wherein an outlet of the material preheating subsystem is connected with an inlet of the rectifying subsystem; an outlet of the rectification subsystem is connected with an inlet of the evaporation subsystem so as to discharge steam generated in the rectification process into the evaporation subsystem for heat exchange, and further condense the steam into liquid to be discharged into a finished product tank; and the outlet of the evaporation subsystem is connected with the inlet of the material preheating subsystem so as to compress secondary steam generated in the evaporation process and use the compressed secondary steam as a heat source for preheating materials in the material preheating subsystem.
According to one embodiment of the invention, the rectification subsystem comprises: the first outlet of the rectifying tower is connected with the inlet of the evaporation subsystem, the second outlet of the rectifying tower is connected with the first inlet of the reboiler, and the first inlet of the rectifying tower is connected with the outlet of the material preheating subsystem; the first outlet of the reboiler is connected with the second inlet of the rectifying tower.
According to one embodiment of the invention, the vaporization subsystem comprises: the system comprises an evaporator, a finished product cache tank and a finished product pump, wherein a first inlet of the evaporator is connected with a first outlet of the rectifier, a first outlet of the evaporator passes through the finished product cache tank and is connected with an inlet of the finished product pump, and an outlet of the finished product pump is connected with an inlet of the material preheating subsystem.
According to an embodiment of the invention, the rectification subsystem further comprises a reflux pump, an inlet of the reflux pump is connected with an outlet of the finished product cache tank, and an outlet of the reflux pump is connected with a third inlet of the rectification tower.
According to one embodiment of the invention, the vaporization subsystem further comprises: the system comprises a separator, a first vapor compressor and a forced circulation pump, wherein an inlet of the separator is connected with a second outlet of the evaporator, a first outlet of the separator is connected with an inlet of the first vapor compressor, and an outlet of the first vapor compressor is connected with an inlet of the material preheating subsystem; and a second outlet of the separator is connected with an inlet of the forced circulation pump, and an outlet of the forced circulation pump is connected with a second inlet of the evaporator.
According to an embodiment of the invention, the evaporation subsystem further comprises a second vapor compressor, an inlet of the second vapor compressor is connected with an outlet of the first vapor compressor, an outlet of the second vapor compressor is connected with a second inlet of the reboiler through a first pipeline, and the first pipeline is further connected with a pipe section for introducing raw vapor.
According to an embodiment of the invention, the evaporation subsystem further comprises a first condensate tank and a first condensate pump connected in series with the first condensate tank, and a second condensate tank and a second condensate pump connected in series with the second condensate tank, wherein an inlet of the first condensate tank is connected with an outlet of the material preheating subsystem, and an inlet of the second condensate tank is connected with a second outlet of the reboiler; outlets of the first condensate pump and the second condensate pump are respectively connected with an inlet of the material preheating subsystem; and the outlet of the first condensate pump is respectively connected with the first steam compressor and the second steam compressor through a second pipeline.
According to one embodiment of the invention, the material preheating subsystem comprises: the system comprises a primary preheater, a secondary preheater and a tertiary preheater which are sequentially connected in series, wherein a first inlet of the primary preheater is connected with an outlet of a finished product pump; a first inlet of the secondary preheater is connected with outlets of the first condensate pump and the second condensate pump; the first inlet of the third-stage preheater is connected with the outlet of the first steam compressor, the first outlet of the third-stage preheater is connected with the first inlet of the rectifier, and the second outlet of the third-stage preheater is connected with the first condensate tank.
According to an embodiment of the invention, the mechanical vapor recompression heat pump rectification system further comprises a feed subsystem comprising a feed buffer tank and a feed pump arranged in series in this order, wherein an outlet of the feed pump is connected to the second inlet of the primary preheater.
According to an embodiment of the invention, the mechanical vapor recompression heat pump rectification system further comprises: a finished product subsystem, the finished product subsystem comprising: the system comprises a finished product tank, a vacuum pump, a tail gas cooler, a tower bottom liquid cooler and a tower bottom liquid tank which are sequentially connected in series, wherein an inlet of the finished product tank is connected with a first outlet of a primary preheater; a first inlet of the tower bottom liquid cooler is connected with a first outlet of the secondary preheater, a second inlet of the tower bottom liquid cooler is connected with a third outlet of the reboiler, and a first outlet of the tower bottom liquid cooler is connected with a second inlet of the separator; an inlet of the vacuum pump is connected with a third outlet of the tertiary preheater and is connected with a fourth outlet of the reboiler; and the inlet of the tail gas cooler is connected with the third outlet of the evaporator, and the outlet of the tail gas cooler is connected with the inlet of the finished product cache tank.
According to the mechanical vapor recompression heat pump rectification system provided by the embodiment of the invention, the vapor generated in the rectification process of the rectification subsystem is subjected to heat exchange in the evaporation subsystem, so that the vapor is condensed into a liquid state, the water in the evaporation subsystem becomes a gas-liquid mixture after the heat exchange, and the gas-liquid mixture is subjected to gas-liquid separation and compression and then is used as a heat source for preheating of the material preheating subsystem, so that the problems of difficult compressor type selection and high manufacturing cost of the traditional rectification tower top vapor direct compression heat pump rectification system are solved, the hidden danger problems of vapor leakage, explosion and corrosion in the compression process are eliminated, the latent heat of the top vapor and the heat of the tower bottom liquid are recovered at the same time, the heat utilization rate in the rectification process is improved, and the operation cost is greatly saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a mechanical vapor recompression heat pump rectification system according to an embodiment of the present invention.
Description of reference numerals:
1-a raw material buffer tank; 2-a feed pump; 3-a primary preheater; 4-a secondary preheater; 5-a three-stage preheater; 6-a rectifying tower; 7-a reboiler; 8-an evaporator; 9-a separator; 10-forced circulation pump; 11-finished product buffer tank; 12-a first vapor compressor; 13-a second vapor compressor; 14-a reflux pump; 15-finished product pump; 16-a first condensate tank; 17-a second condensate tank; 18-a second condensate pump; 19-a first condensate pump; 20-finished product tank; 21-tower bottoms cooler; 22-column pot; 23-a tail gas cooler; 24-a vacuum pump; 31-a first conduit; 32-second line.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present invention, unless otherwise specified, "plurality", "plural groups" means two or more, and "several", "several groups" means one or more.
Referring now to fig. 1, an embodiment of the present invention will be described. It should be understood that the following description is only exemplary embodiments of the present invention and does not constitute any particular limitation of the present invention.
The mechanical vapor recompression heat pump rectification system provided by the embodiment of the invention comprises: the system comprises a material preheating subsystem, a rectifying subsystem and an evaporating subsystem. Specifically, the material enters a rectification subsystem after being preheated in a material preheating subsystem, and the rectification subsystem realizes the separation of various substances with different boiling points by utilizing the characteristic that each component in the material has different volatility. During the rectification process, the generated steam is discharged from the rectification subsystem and enters the evaporation subsystem. In the evaporation subsystem, heat exchange is carried out between steam and water in the evaporation subsystem, then the steam is condensed into liquid and discharged to a finished product tank, the water in the evaporation subsystem is heated to become a gas-liquid mixture, the gas-liquid mixture is subjected to gas-liquid separation and compression to become high-temperature and high-pressure secondary steam, and the secondary steam enters the material preheating subsystem to serve as a heat source for preheating materials.
According to the mechanical vapor recompression heat pump rectification system provided by the embodiment of the invention, the vapor generated in the rectification process of the rectification subsystem is subjected to heat exchange in the evaporation subsystem, so that the vapor is condensed into a liquid state, the water after heat exchange becomes a gas-liquid mixture, and the gas-liquid mixture is subjected to gas-liquid separation and compression and then is used as a heat source for preheating of the material preheating subsystem, so that the problems of difficult compressor type selection and high manufacturing cost of the traditional rectification tower top vapor direct compression heat pump rectification system are solved, meanwhile, the hidden danger problems of vapor leakage, explosion and corrosion in the compression process are eliminated, simultaneously, the latent heat of the top vapor is recovered, the heat utilization rate in the rectification process is improved, and the operation cost is greatly saved.
As shown in fig. 1, in one embodiment of the present invention, a rectification subsystem includes: a rectifying column 6 and a reboiler 7. Specifically, the outlet of the material preheating subsystem is connected with the first inlet of the rectifying tower 6, the material enters the rectifying tower 6 after being preheated, steam generated in the rectifying process enters the evaporation subsystem from the first outlet of the rectifying tower 6 and exchanges heat with water in the evaporation subsystem, and then the steam is condensed into liquid and discharged to the finished product tank 20. And the tower bottom liquid is discharged into a tube side material flow inlet of the reboiler 7 from a second outlet of the rectifying tower 6, and after the tower bottom liquid is subjected to heat exchange in the reboiler 7, part of the tower bottom liquid enters the rectifying tower 6 from a tube side material flow outlet of the reboiler 7.
Further, in the embodiment of the present invention, the rectifying tower 6 may be a plate rectifying tower, a packed rectifying tower, or a hybrid rectifying tower.
Further, in embodiments of the present invention, optionally, the reboiler 7 is a shell and tube heat exchanger. It should be noted that the reboiler 7 is only illustrative and other types of reboilers are also suitable for the present invention, and not limited to the shell-and-tube heat exchanger as defined in the present embodiment.
As shown in FIG. 1, in one embodiment of the invention, the vaporization subsystem includes: evaporator 8, finished product buffer tank 11 and finished product pump 15. Specifically, steam generated in the rectification process enters a shell pass of the evaporator 8 to exchange heat with water in a tube pass of the evaporator 8, the steam is condensed into liquid after heat exchange, the liquid is discharged to the finished product cache tank 11 from a shell pass outlet of the evaporator 8, and then the liquid enters the material preheating subsystem to preheat the material under the driving of the finished product pump 15, so that the waste heat of the liquid is recycled. After the waste heat is recovered, the liquid enters a finished product tank 20 to realize the collection of finished products.
Further, in the present embodiment, the evaporator 8 may be a falling film evaporator, a forced circulation evaporator, or a natural circulation evaporator. The evaporator 8 can be a shell-and-tube heat exchanger or a plate heat exchanger, depending on the form of heat exchange.
Further, in this embodiment, the finished pump 15 may be a variable frequency pump or a power frequency pump.
Further, in one embodiment of the present invention, the rectification subsystem further includes a reflux pump 14. The liquid is divided into two branches when flowing out of the finished product buffer tank 11. A part of liquid enters the material waste heat subsystem under the drive of the finished product pump 15, and a part of liquid enters the rectifying tower 6 under the drive of the reflux pump 14.
Further, in this embodiment, the reflux pump 14 may be a variable frequency pump or a power frequency pump.
Referring to fig. 1, in one embodiment of the present invention, the vaporization subsystem further includes: a separator 9, a first vapor compressor 12 and a forced circulation pump 10. Specifically, the steam generated in the rectification process exchanges heat with water in the tube pass of the evaporator 8 in the evaporator 8, and the water after heat exchange becomes a gas-liquid mixture. The gas-liquid mixture enters a separator 9 for gas-liquid separation, and the separated steam enters a first steam compressor 12 to be compressed into high-temperature and high-pressure gas which enters a material preheating subsystem as a heat source for preheating materials. The separated liquid is driven by a forced circulation pump 10 to continuously enter the tube pass of the evaporator 8, and continuously exchanges heat with steam generated in the rectification process.
Further, in the present embodiment, the first vapor compressor 12 may be any one of a centrifugal vapor compressor, a roots vapor compressor, or a screw vapor compressor.
Further, in this embodiment, the forced circulation pump 10 may be a variable frequency pump or a power frequency pump.
With continued reference to fig. 1, in one embodiment of the present invention, the vaporization subsystem further includes: a second vapor compressor 13. Specifically, after the gas separated from the separator 9 is compressed by the first vapor compressor 12, a part of the gas enters the material preheating subsystem as a heat source for preheating the material; and a part of the heat is compressed again by the second steam compressor 13 and then enters the shell side of the reboiler 7 through the first pipeline 31 to be used as a heat source of tower bottom liquid in a heating tube side of the reboiler 7. Further, a pipe section for introducing raw steam is connected to the first pipeline 31, and the raw steam enters the mechanical steam recompression heat pump rectification system through the first pipeline 31 to be used as a heat source for preheating the rectification system during starting up or for supplementing heat to the rectification system.
Further, in the present embodiment, the second vapor compressor 13 may be any one of a centrifugal vapor compressor, a roots vapor compressor, or a screw vapor compressor.
According to the mechanical vapor recompression heat pump rectification system provided by the embodiment of the invention, the evaporation subsystem is arranged, so that a gas-liquid mixture generated by heat exchange in the evaporator is subjected to gas-liquid separation and compression to form high-temperature and high-pressure gas, and the high-temperature and high-pressure gas is further used as a heat source for preheating materials by the material preheating subsystem and heating tower bottom liquid by the reboiler, so that the heat utilization rate of the rectification system is greatly improved, and the operation cost is greatly saved.
Referring to fig. 1, in one embodiment of the present invention, the vaporization subsystem further includes: a first condensate tank 16, a first condensate pump 19, a second condensate tank 17 and a second condensate pump 18. Specifically, the first condensate tank 16 is provided in series with the first condensate pump 19. High-temperature and high-pressure steam formed after being compressed by the first steam compressor 12 enters the material preheating subsystem to preheat the material, is condensed into water after being subjected to heat exchange with the material, enters the first water condensing tank 16, and then enters the material preheating subsystem again to preheat the material under the driving of the first water condensing pump 19.
The second condensate tank 17 is connected in series with a second condensate pump 18. High-temperature and high-pressure steam formed after being compressed by the second steam compressor 13 enters a shell pass of the reboiler 7 to exchange heat with tower bottoms in a tube pass, condensed water after heat exchange enters the second condensate tank 17, and enters the material preheating subsystem together with water in the first condensate tank 16 under the driving of the second condensate pump 18 to preheat materials.
Further, in the present embodiment, the outlet of the first condensate pump 19 is connected to the first vapor compressor 12 and the second vapor compressor 13 through the second pipe 32. Specifically, the second pipeline 32 is a water injection pipeline, and can perform water injection cooling on the exhaust pipes of the first vapor compressor 12 and the second vapor compressor 13.
Further, in this embodiment, the first condensate pump 19 and the second condensate pump 18 may be variable frequency pumps or power frequency pumps.
With continued reference to FIG. 1, in one embodiment of the invention, a material preheating subsystem comprises: a primary preheater 3, a secondary preheater 4 and a tertiary preheater 5. Specifically, the material enters the secondary preheater 4 for preheating after being preheated by the primary preheater 3 and then enters the tertiary preheater 5 for preheating. After the three-stage preheating, the materials enter a rectifying tower 6 from a three-stage preheater 5 for rectification.
Further, steam generated in the rectification process is converted into liquid after heat exchange in the evaporator 8, and the liquid enters the primary preheater 3 to preheat the material under the driving of the finished product pump 15, so that the waste heat of the liquid is recycled.
The high-temperature and high-pressure gas formed after being compressed by the first steam compressor 12 enters the three-stage preheater 5 to preheat the material, and the high-temperature and high-pressure gas is condensed into water after heat exchange and enters the first condensate tank 16. The water in the first water condensing tank 16 and the second water condensing tank 17 respectively enters the secondary preheater 4 under the driving of the first water condensing pump 19 and the second water condensing pump 18 to preheat the materials, and then the waste heat of the water in the first water condensing tank 16 and the second water condensing tank 17 is recycled.
Further, in the present embodiment, the primary preheater 3 and the secondary preheater 4 may be plate heat exchangers, and the tertiary preheater 5 may be a shell-and-tube heat exchanger. It is understood that the primary preheater 3, the secondary preheater 4 and the tertiary preheater 5 are illustrated schematically in this embodiment, and may be all shell-and-tube heat exchangers or plate heat exchangers, or may be other heat exchangers, and is not limited to the scope defined in this embodiment.
In addition, it should be noted that: the three-stage preheating is only one embodiment of the present invention, and the number of preheating stages can be set according to the energy saving requirement and the stability of the system in the specific implementation process, and is not limited to the content of this embodiment.
With continued reference to fig. 1, in one embodiment of the invention, the mechanical vapor recompression heat pump rectification system further comprises a feed subsystem. Specifically, the feed subsystem includes a feed buffer tank 1 and a feed pump 2 connected to the feed buffer tank 1. The material is driven by the feed pump 2 to enter the first-stage preheater 3 from the raw material buffer tank 1, and enters the rectifying tower 6 to be rectified after being preheated by three stages in sequence.
Further, in this embodiment, the feed pump 2 may be a variable frequency pump, and may also be a power frequency pump.
With continued reference to fig. 1, in one embodiment of the invention, the mechanical vapor recompression heat pump rectification system further comprises a product subsystem. Specifically, the product subsystem includes a product tank 20 connected to the primary preheater 3. Steam generated in the rectification process is condensed into liquid after heat exchange with water in the evaporator 8, and the liquid preheats materials in the primary preheater 3 and then enters the finished product tank 20 to realize the collection of finished products.
The finished product subsystem further comprises a tower bottoms cooler 21 and a tower bottoms tank 22 connected to the tower bottoms cooler 21. Tower bottoms enter the tower bottoms cooler 21 from the reboiler 7 to be cooled, and the cooled tower bottoms enter the tower bottoms liquid tank 22 to be collected. The water in the first condensed water tank 16 and the second condensed water tank 17 enters the secondary preheater 4 to preheat the material, then enters the tower bottom liquid cooler 21 to cool the tower bottom liquid, and becomes high-temperature liquid after heat exchange and enters the separator 9.
The finished product subsystem also comprises a vacuum pump 24, and the shell pass of the three-stage preheater 5 and the shell pass of the reboiler 7 are both provided with non-condensable gas exhaust ports which are connected with the vacuum pump 24 and used for vacuumizing the rectification system and exhausting the non-condensable gas.
The finished product subsystem also comprises a tail gas cooler 23, circulating water is introduced into the tail gas cooler 23, a non-condensable gas outlet is also formed in the shell pass of the evaporator 8, non-condensable gas enters the tail gas cooler 23 from the non-condensable gas outlet, heat exchange is carried out between the non-condensable gas and the circulating water, and the condensed non-condensable gas enters the finished product cache tank 11.
According to the mechanical vapor recompression heat pump rectification system provided by the embodiment of the invention, the latent heat of the tower top vapor and the heat of the tower bottom liquid are fully recycled, the heat utilization rate in the rectification process is improved, and the operation cost is greatly saved.
The working principle of the mechanical vapor recompression heat pump rectification system provided by the embodiment of the invention is described in detail by taking the embodiment shown in fig. 1 as an example.
The materials in the raw material buffer tank 1 are sequentially driven by the feed pump 2 to enter the first-stage preheater 3, the second-stage preheater 4 and the third-stage preheater 5 for multi-stage preheating. The preheated material enters a rectifying tower 6 for rectification.
The steam generated in the rectification process is discharged from a steam outlet at the top of the rectification tower 6 and enters the shell pass of the evaporator 8. The steam exchanges heat with water in the tube pass of the evaporator 8, and the steam is condensed into liquid after heat exchange and enters the finished product cache tank 11. Wherein, part of the liquid enters a primary preheater 3 to preheat the materials under the drive of a finished product pump 15, and then enters a finished product tank 20 to collect finished products; part of the liquid enters the rectifying tower 6 under the driving of a reflux pump 14. The bottoms are discharged from the rectifying tower 6 into the tube side of the reboiler 7.
Steam generated in the rectification process enters the shell pass of the evaporator 8 and is subjected to heat exchange with water in the tube pass, and the water after heat exchange becomes a gas-liquid mixture and enters the separator 9 for gas-liquid separation. The separated gas is compressed into high-temperature and high-pressure steam by the first steam compressor 12, and then part of the gas enters the third-stage preheater 5 to preheat the material, so that the latent heat of the steam is recycled. Steam after heat exchange with the material is condensed into water, the water enters the first condensate tank 16 and enters the secondary preheater 4 to preheat the material under the driving of the first condensate pump 19. Part of the gas continues to be compressed in the second vapor compressor 13, and the formed high-temperature and high-pressure gas enters the shell side of the reboiler 7 to be used as a heat source for heat exchange with the tower bottoms in the tube side. After heat exchange, part of the tower bottoms heated in the tube pass enters the rectifying tower 6, and part of the tower bottoms is discharged to the tower bottoms cooler 21. Steam is condensed into water after heat exchange and enters the second condensate tank 17, the water enters the secondary preheater 4 under the driving of the second condensate pump 18 to preheat materials, and then the waste heat of the condensed water is recycled.
The condensed water is subjected to waste heat recovery in the secondary preheater 4, and then enters the tower bottom liquid cooler 21 to cool the tower bottom liquid, and the cooled tower bottom liquid enters the tower bottom liquid tank 22 to be collected. The water and the bottoms in the bottoms cooler 21 are heat-exchanged and then enter the separator 9.
Also included in the rectification system shown in this embodiment is a first conduit 31 and a second conduit 32. The first pipeline 31 is connected with a pipe section for introducing raw steam, and can be used as a heat source for preheating when starting up the rectification system or for supplementing heat for the rectification system. The second line 32 is a water spray line and may provide water spray cooling to the discharge lines of the first and second vapor compressors 12 and 13.
In the embodiment, the shell sides of the reboiler 7 and the tertiary preheater 5 are both provided with a noncondensable gas discharge port, and the discharge port is connected with a vacuum pump 24 and used for vacuumizing the rectification system and discharging the noncondensable gas. The shell pass of the evaporator 8 is also provided with a non-condensable gas outlet, and the non-condensable gas exchanges heat with circulating water in the tail gas cooler 23 and flows into the finished product cache tank 11 after being condensed.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a machinery vapor recompression heat pump rectification system which characterized in that includes: a material preheating subsystem, a rectification subsystem and an evaporation subsystem,
wherein the outlet of the material preheating subsystem is connected with the inlet of the rectification subsystem;
an outlet of the rectification subsystem is connected with an inlet of the evaporation subsystem so as to discharge steam generated in the rectification process into the evaporation subsystem for heat exchange, and further condense the steam into liquid to be discharged into a finished product tank;
and the outlet of the evaporation subsystem is connected with the inlet of the material preheating subsystem so as to compress secondary steam generated in the evaporation process and use the compressed secondary steam as a heat source for preheating materials in the material preheating subsystem.
2. The mechanical vapor recompression heat pump rectification system as claimed in claim 1, wherein the rectification subsystem comprises: a rectifying tower and a reboiler, wherein the reboiler is arranged in the rectifying tower,
the first outlet of the rectifying tower is connected with the inlet of the evaporation subsystem, the second outlet of the rectifying tower is connected with the first inlet of the reboiler, and the first inlet of the rectifying tower is connected with the outlet of the material preheating subsystem;
the first outlet of the reboiler is connected with the second inlet of the rectifying tower.
3. The mechanical vapor recompression heat pump rectification system as claimed in claim 2, wherein the evaporation subsystem comprises: an evaporator, a finished product buffer tank and a finished product pump,
the first inlet of the evaporator is connected with the first outlet of the rectifier, the first outlet of the evaporator is connected with the inlet of the finished product pump through the finished product cache tank, and the outlet of the finished product pump is connected with the inlet of the material preheating subsystem.
4. The mechanical vapor recompression heat pump rectification system as claimed in claim 3, wherein the rectification subsystem further comprises a reflux pump, an inlet of the reflux pump is connected with an outlet of the finished product buffer tank, and an outlet of the reflux pump is connected with a third inlet of the rectification tower.
5. The mechanical vapor recompression heat pump rectification system as claimed in claim 3, wherein the evaporation subsystem further comprises: a separator, a first vapor compressor and a forced circulation pump,
wherein the inlet of the separator is connected with the second outlet of the evaporator, the first outlet of the separator is connected with the inlet of the first vapor compressor, and the outlet of the first vapor compressor is connected with the inlet of the material preheating subsystem;
and a second outlet of the separator is connected with an inlet of the forced circulation pump, and an outlet of the forced circulation pump is connected with a second inlet of the evaporator.
6. The mechanical vapor recompression heat pump rectification system as claimed in claim 5, wherein the evaporation subsystem further comprises a second vapor compressor having an inlet connected to an outlet of the first vapor compressor, and an outlet of the second vapor compressor is connected to a second inlet of the reboiler via a first line,
wherein, the first pipeline is also connected with a pipe section for introducing the raw steam.
7. The mechanical vapor recompression heat pump rectification system as claimed in claim 6, wherein the evaporation subsystem further comprises a first condensate tank and a first condensate pump connected in series with the first condensate tank, and a second condensate tank and a second condensate pump connected in series with the second condensate tank,
wherein the inlet of the first condensate tank is connected with the outlet of the material preheating subsystem, and the inlet of the second condensate tank is connected with the second outlet of the reboiler;
outlets of the first condensate pump and the second condensate pump are respectively connected with an inlet of the material preheating subsystem;
and the outlet of the first condensate pump is respectively connected with the first steam compressor and the second steam compressor through a second pipeline.
8. The mechanical vapor recompression heat pump rectification system as claimed in claim 7, wherein the material preheating sub-system comprises: a primary preheater, a secondary preheater and a tertiary preheater which are sequentially connected in series,
the first inlet of the primary preheater is connected with the outlet of the finished product pump;
a first inlet of the secondary preheater is connected with outlets of the first condensate pump and the second condensate pump;
the first inlet of the third-stage preheater is connected with the outlet of the first steam compressor, the first outlet of the third-stage preheater is connected with the first inlet of the rectifier, and the second outlet of the third-stage preheater is connected with the first condensate tank.
9. The mechanical vapor recompression heat pump rectification system as claimed in claim 8, further comprising a feed subsystem, the feed subsystem comprising a feed buffer tank and a feed pump arranged in series in sequence,
wherein the outlet of the feed pump is connected to the second inlet of the primary preheater.
10. The mechanical vapor recompression heat pump rectification system as recited in claim 8, further comprising: a finished product subsystem, the finished product subsystem comprising: the finished product tank, the vacuum pump, the tail gas cooler, and the tower bottom liquid cooler and the tower bottom liquid tank which are sequentially connected in series,
wherein the inlet of the finished product tank is connected with the first outlet of the primary preheater;
a first inlet of the tower bottom liquid cooler is connected with a first outlet of the secondary preheater, a second inlet of the tower bottom liquid cooler is connected with a third outlet of the reboiler, and a first outlet of the tower bottom liquid cooler is connected with a second inlet of the separator;
an inlet of the vacuum pump is connected with a third outlet of the tertiary preheater and is connected with a fourth outlet of the reboiler;
and the inlet of the tail gas cooler is connected with the third outlet of the evaporator, and the outlet of the tail gas cooler is connected with the inlet of the finished product cache tank.
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| CN114593615A (en) * | 2022-03-23 | 2022-06-07 | 上海谋基实业有限公司 | Energy recycling method for acrylic acid purification process |
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