CN109107204B - System and method capable of improving concentration degree of mechanical vapor recompression system - Google Patents

System and method capable of improving concentration degree of mechanical vapor recompression system Download PDF

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CN109107204B
CN109107204B CN201811204629.2A CN201811204629A CN109107204B CN 109107204 B CN109107204 B CN 109107204B CN 201811204629 A CN201811204629 A CN 201811204629A CN 109107204 B CN109107204 B CN 109107204B
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heat
evaporator
pipeline
compressor
concentrated material
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CN109107204A (en
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张圆
刘雪奇
梅拥军
周洪
谢麟
张同林
吴斌
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Chengdu Newave Aerochemical Co ltd
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Chengdu Newave Aerochemical Co ltd
Second Research Institute of CAAC
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D1/00Evaporating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D1/00Evaporating
    • B01D1/30Accessories for evaporators ; Constructional details thereof

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Abstract

本发明涉及化工及环保领域,具体的说是一种可提高机械蒸汽再压缩系统浓缩程度的系统及方法,包括蒸发器、压缩机、补热器和出料泵,蒸发器的底部浓缩物料出料口与补热器通过管道相连;补热器上部汽相出口与蒸发器底部汽相进口通过管道相连;蒸发器与压缩机进口通过管道相连,压缩机出口与蒸发器壳程蒸汽进口通过管道连接;补热器底部再浓缩物料出料口与出料泵通过管道相连,出料泵出口分为两路:一路通过管道与补热器相连,一路通过管道与产品储罐相连。本发明提出的一种可提高机械蒸汽再压缩系统浓缩程度的系统及方法中,经机械蒸汽再压缩系统浓缩后的浓缩物料在排出系统前还与补热器再进行了热交换,其浓缩程度相较于传统补热方案高5~20%。

Figure 201811204629

The invention relates to the fields of chemical industry and environmental protection, in particular to a system and method for improving the concentration degree of a mechanical vapor recompression system, comprising an evaporator, a compressor, a heat supplementary device and a discharge pump. The material port is connected to the heat supplementary device through a pipeline; the vapor phase outlet of the upper part of the heat supplementary device is connected to the vapor phase inlet of the bottom of the evaporator through a pipeline; the evaporator is connected to the compressor inlet through a pipeline, and the compressor outlet is connected to the evaporator shell side steam inlet through a pipeline Connection; the reconcentrated material discharge port at the bottom of the heat supplement is connected to the discharge pump through a pipeline, and the discharge pump outlet is divided into two paths: one is connected to the heat supplement through a pipeline, and the other is connected to the product storage tank through a pipeline. In the system and method for improving the concentration degree of the mechanical vapor recompression system proposed by the present invention, the concentrated material after being concentrated by the mechanical vapor recompression system is further heat-exchanged with the heater before being discharged from the system. Compared with the traditional heat supplement scheme, it is 5~20% higher.

Figure 201811204629

Description

System and method capable of improving concentration degree of mechanical vapor recompression system
Technical Field
The invention relates to the fields of chemical industry and environmental protection, in particular to a system and a method capable of improving the concentration degree of a mechanical vapor recompression system.
Background
The mechanical vapor recompression technology is an energy-saving technology widely applied to the chemical evaporation and concentration process at present, and belongs to the fields of salt concentration, organic matter recovery and concentration, seawater desalination and the like. The core of the device is that low-temperature and low-pressure steam generated in the evaporation process is mechanically compressed to become high-temperature and high-pressure steam, and then the high-temperature and high-pressure steam is used as a heat source again for utilization. The mechanical vapor recompression technology not only recovers a large amount of latent heat in low-grade steam and saves energy, but also greatly reduces the cold quantity required by low-temperature steam condensation and reduces the operation cost in the evaporation process.
Patent No. CN 105363227 a discloses a mechanical vapor recompression system and a mechanical vapor recompression method based on the system. The method adopts a steam generator which takes water as a medium as a heat supplementing heat source when the heat of a system is insufficient, and water steam generated by the steam generator and steam generated by material steam enter a compressor together and are used as a material solution steam heating source after being compressed. Although the heat supplement of the method can maintain the system to operate, the utilization rate of the heat supplement is not high, and the concentration degree of materials is not improved.
Under an ideal stable state, except that the vapor compressor does work on the system, the mechanical vapor recompression evaporation concentration system does not need to provide extra energy from the outside after running stably. However, in actual operation, the system has energy dissipation loss, such as heat loss caused by insufficient heat preservation of the system, heat taken away by discharging of concentrated materials, heat taken away by steam condensate, and the like, when the work of the steam compressor on the system cannot compensate for the heat loss of the system, if additional heat compensation is not performed on the system in time, the system is difficult to keep a stable operation state. At present, heat supplement to a mechanical vapor recompression evaporation concentration system is generally carried out in a form of directly supplementing vapor, and fresh vapor and secondary vapor at the outlet of a compressor are used as heat sources of an evaporator together. The system is additionally supplemented with heat, so that the stable operation of the system is ensured, but the additional supplemented heat of the traditional scheme cannot improve the concentration degree of the system to materials in a stable state, and the heat is not fully and efficiently utilized.
Disclosure of Invention
In order to overcome the problems in the prior art, a system and a method which are strong in adaptability, high in concentration degree of concentrated materials and high in energy utilization rate and can improve the concentration degree of a mechanical vapor recompression system are particularly provided.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
the invention provides a system capable of improving the concentration degree of a mechanical vapor recompression system, which adopts the following technical scheme:
a system capable of improving the concentration degree of a mechanical vapor recompression system is characterized in that: the device comprises an evaporator, a compressor, a heat compensator and a discharge pump, wherein a concentrated material discharge port at the bottom of the evaporator is connected with the heat compensator through a pipeline; the upper vapor phase outlet of the heat compensator is connected with the bottom vapor phase inlet of the evaporator through a pipeline; the evaporator is connected with an inlet of the compressor through a pipeline, and an outlet of the compressor is connected with a shell-side steam inlet of the evaporator through a pipeline; the bottom of the heat compensator is connected with a discharge pump through a pipeline, and the outlet of the discharge pump is divided into two paths: one path is used as circulation and connected with the heat compensator through a pipeline, and the other path is used as discharge and connected with the product storage tank through a pipeline.
Furthermore, a washing and separating device can be arranged on a pipeline between the evaporator and the inlet of the compressor, so that concentrated components in steam generated by evaporation of the evaporator are removed, and the purity of the steam is improved. The washing and separating device can be a device with washing and separating functions, such as a spray tower, a washing tower, a rectifying tower and the like.
The feeding storage tank is connected with a heat exchanger through a feeding pump, and the heat exchanger is connected with the evaporator and the condensate storage tank.
The pipeline of the discharge port of the concentrated material at the bottom of the evaporator is provided with an automatic flow control system, the concentrated material at the bottom of the evaporator can be conveyed in a pumping mode, and the gravity-free conveying, preferably gravity-free conveying, of the concentrated material can also be realized by adjusting the relative installation position of the evaporator and the heat compensator.
The heat compensator is provided with a liquid level controller, and a circulating pipeline at the outlet of the discharging pump is used as a forced circulating pipeline of the heat compensator; the discharge pipeline of the discharge pump is provided with a flow control system.
The system adopts an automatic control mode, including but not limited to the following control modes: PLC control, DCS control, etc.
The form of the heat compensator includes but is not limited to the following forms: dividing wall type heat exchanger, electric heater and electromagnetic radiation heater.
The external heat source of the heat compensator includes but is not limited to the following modes: electrical heating, steam heating and heating of hot liquid media.
A method capable of improving the concentration degree of a mechanical vapor recompression system comprises the following technical scheme:
when the mechanical vapor recompression system needs to provide supplementary heat from the outside because the heat dissipation loss is larger than the work done by the compressor, a concentrated material outlet at the bottom of the evaporator is connected with the heat compensator, and the concentrated material in the evaporator is heated by the heat compensator to become a vapor-liquid two phase; after the vapor phase and the liquid phase are separated, the vapor phase enters the evaporation system to be used as supplementary heat of a mechanical vapor recompression system, and enters a compressor together with secondary vapor generated by an evaporator to be used as an evaporator heat source after compression and temperature rise; the residual re-concentrated material after being further heated and concentrated by the heat compensator is taken as a concentrated material product and discharged out of the system by a discharge pump.
Further, the method comprises the following specific steps:
s1, feeding the concentrated material at the bottom of the evaporator into a heat compensator through a pipeline, heating the concentrated material by the heat compensator to change the concentrated material into a vapor-liquid two phase, feeding the vapor phase into the evaporator through a pipeline from a vapor phase inlet at the bottom of the evaporator, and feeding the vapor phase and the secondary steam generated by evaporation of the evaporator into a compressor through a pipeline; the steam is compressed by a compressor and then becomes high-temperature high-pressure steam which is used as a heat source of an evaporator and enters the shell of the evaporator through a pipeline to heat and evaporate feed liquid; the steam heats the feeding liquid to become condensate, the condensate enters the heat exchanger to preheat the feeding liquid conveyed by the feeding pump, and the condensate finally enters the condensate storage tank.
S2, the concentrated material is heated by a heat compensator and then becomes a vapor phase and a liquid phase, wherein the liquid phase re-concentrated material is divided into two paths by a pipeline through a discharge pump: one path enters a heat compensator through a pipeline and enters circulation; one path is discharged to a product storage tank through a pipeline to be used as a discharge.
Furthermore, the vapor phase generated by heating the concentrated material by the heat compensator can enter a pipeline through a pipeline, enters a compressor together with the secondary steam generated by evaporation of the evaporator through the pipeline, and is compressed by the compressor to become high-temperature high-pressure steam which is used as a heat source of the evaporator.
According to the method for improving the concentration degree of the mechanical vapor recompression system, the concentration degree of the liquid-phase re-concentrated material obtained by the heat compensator is 5-20% higher than that of the traditional heat compensation scheme under the condition that the energy consumption of the system is the same.
The method is suitable for an evaporation concentration system of organic matter mixture, aqueous solution and salt solution thereof.
Furthermore, the device is suitable for mechanical vapor recompression systems of non-azeotropic systems of organic matters, water and organic matter mixtures, in particular to concentration systems of ethylene glycol, propylene glycol or diethylene glycol or mixture water solutions thereof.
The heat compensator utilizes an external heat source to heat the concentrated material discharged by the evaporator of the mechanical vapor recompression system to generate steam, and the generated steam is used as supplementary heat and enters the evaporation system.
The heat compensator heats the concentrated material discharged from the evaporator of the mechanical vapor recompression system by using an external heat source to generate steam, the generated steam is used as supplementary heat, enters the mechanical vapor recompression evaporation system through an evaporator or a secondary steam pipeline before entering a compressor or a pipeline and equipment before an air inlet of the compressor, and enters the compressor together with the secondary steam generated by the evaporator, and the method comprises the following steps: evaporator bottom air intake, compressor air intake, piping before compressor air intake, and the like.
Furthermore, a washing and separating device can be arranged on a pipeline between the evaporator and the inlet of the compressor, so that concentrated components in steam generated by evaporation of the evaporator are removed, and the purity of the steam is improved. The washing and separating device can be a device with washing and separating functions, such as a spray tower, a washing tower, a rectifying tower and the like.
The invention has the advantages and beneficial effects that:
1. compared with the traditional heat compensation scheme, in the system and the method for improving the concentration degree of the mechanical vapor recompression system, the concentrated material concentrated by the mechanical vapor recompression system is subjected to heat exchange with the heat compensator before being discharged out of the system, and the concentration degree is 5-20% higher than that of the traditional heat compensation scheme. In the present invention, the external heat additionally injected into the system has two effects: firstly, the heat loss of the system is compensated, and the stable operation of the system is ensured; and secondly, the concentrated material concentrated by the mechanical vapor recompression system is further heated and concentrated, so that the concentration degree of the concentrated material is improved. In the traditional heat supplementing scheme, the heat of the external extra injection system only can generate the first effect and cannot generate the second effect, so that the application of the heat of the external extra injection system is increased, the concentration degree of the concentrated material is obviously improved, the concentration degree is 5-20% higher than that of the traditional heat supplementing scheme, the energy utilization rate is more sufficient, and the effect is better.
2. The application is particularly suitable for the concentration process of the material with the boiling point rising along with the concentration increase, and the concentration degree of the concentrated material can be further improved under the condition of not increasing the temperature rise capacity of the steam compressor.
3. When the system is driven, the heat supplementing scheme provided by the invention is adopted, the system heating can be directly used for concentration during driving, and the driving heat can be fully utilized.
4. The technical scheme of the invention has the advantages of simple flow, strong operability, wide application range and high energy utilization rate, and can be widely applied to various mechanical vapor recompression systems.
Drawings
FIG. 1 is a schematic flow chart of a system and method for increasing the concentration level of a mechanical vapor recompression system according to the present invention
In the figure: 1-evaporator, 2-compressor, 3-feeding storage tank, 4-heat compensator, 5-feeding pump, 6-heat exchanger, 7-discharging pump, 8-product storage tank, 9-washing separation device and 10-condensate storage tank.
Detailed Description
For better illustration of the present invention, the technical solution of the present invention will be described in more detail by embodiments, which are a part of embodiments of the present invention, but not all embodiments, with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention based on the technical solution of the present invention.
Example 1
A system capable of improving the concentration degree of a mechanical vapor recompression system comprises an evaporator 1, a compressor 2, a heat compensator 4 and a discharge pump 7, wherein a discharge hole of a concentrated material at the bottom of the evaporator 1 is connected with the heat compensator 4 through a pipeline; the upper vapor phase outlet of the heat compensator 4 is connected with the bottom vapor phase inlet of the evaporator 1 through a pipeline; the evaporator 1 is connected with an inlet of the compressor 2 through a pipeline, and an outlet of the compressor 2 is connected with a shell-side steam inlet of the evaporator 1 through a pipeline; the concentrated material discharge gate passes through the pipeline with discharge pump 7 again in the 4 bottoms of concurrent heating ware and links to each other, 7 exports of discharge pump divide into two the tunnel: one path is used as circulation and connected with the heat compensator 4 through a pipeline, and the other path is used as discharge and connected with the product storage tank 8 through a pipeline.
Furthermore, a washing and separating device 9 can be arranged on a pipeline between the evaporator 1 and the inlet of the compressor 2, so that concentrated components in steam generated by evaporation of the evaporator 1 can be removed, and the purity of the steam can be improved. The washing and separating device 9 may be a device having a washing and separating function, such as a spray tower, a washing tower, or a rectifying tower.
The feeding storage tank 3 is connected with a heat exchanger 6 through a feeding pump 5, and the heat exchanger 6 is connected with the evaporator 1 and a condensate storage tank.
The pipeline of the discharge port of the concentrated material at the bottom of the evaporator 1 is provided with an automatic flow control system, the concentrated material at the bottom of the evaporator 1 can be conveyed in a pumping mode, and the gravity self-flow conveying, preferably gravity self-flow conveying, of the concentrated material can also be realized by adjusting the relative installation positions of the evaporator 1 and the heat compensator 4.
The heat compensator 4 is provided with a liquid level controller, and a circulating pipeline at the outlet of the discharge pump 7 is used as a forced circulating pipeline of the heat compensator 4; the discharge pipeline of the discharge pump 7 is provided with a flow control system.
The system adopts an automatic control mode, including but not limited to the following control modes: PLC control, DCS control, etc.
The form of the heat compensator 4 includes, but is not limited to, the following forms: dividing wall type heat exchanger, electric heater and electromagnetic radiation heater.
The external heat source of the heat compensator 4 includes, but is not limited to, the following modes: electrical heating, steam heating and heating of hot liquid media.
Example 2
A method capable of improving the concentration degree of a mechanical vapor recompression system comprises the following technical scheme:
when the mechanical vapor recompression system needs to provide supplementary heat from the outside because the heat dissipation loss is larger than the work of the compressor 2, a concentrated material outlet at the bottom of the evaporator 1 is connected with the heat compensator 4, and the concentrated material in the evaporator 1 enters the heat compensator 4 to be heated and then becomes a vapor-liquid two phase; after the vapor-liquid two-phase separation, the vapor phase enters the evaporation system to be used as supplementary heat of a mechanical vapor recompression evaporation system, and enters a compressor 2 together with secondary vapor generated by an evaporator 1 to be used as a heat source of the evaporator 1 after compression and temperature rise; the residual re-concentrated material after being further heated and concentrated by the heat compensator 4 is taken as a concentrated material product and discharged out of the system by the discharge pump 7.
Further, the method comprises the following specific steps:
s1, feeding the concentrated material at the bottom of the evaporator 1 into the heat compensator 4 through a pipeline, heating the concentrated material by the heat compensator 4 to change the concentrated material into a vapor-liquid two phase, feeding the vapor phase into the evaporator 1 through a pipeline from a vapor phase inlet at the bottom of the evaporator 1, and feeding the vapor phase and the secondary vapor generated by the evaporation of the evaporator 1 into the compressor 2 through a pipeline; the steam is compressed by a compressor 2 and then becomes high-temperature high-pressure steam which is used as a heat source of an evaporator 1 and enters the shell pass of the evaporator 1 through a pipeline to heat and evaporate feed liquid; the steam heats the feed liquid to become condensate, the condensate enters the heat exchanger 6 to preheat the feed liquid conveyed by the feed pump 5, and the condensate finally enters the condensate storage tank 10.
S2, the concentrated material is heated by the heat compensator 4 and then becomes a vapor-liquid two-phase, wherein the liquid-phase re-concentrated material is divided into two paths by a pipeline through a discharge pump 7: one path enters a heat compensator 4 through a pipeline and enters circulation; one way is discharged to a product storage tank 8 through a pipeline as discharging.
Further, the vapor phase generated by heating the concentrated material by the heat compensator 4 can enter a pipeline through a pipeline, enters the compressor 2 through the pipeline together with the secondary steam generated by evaporation of the evaporator 1, and is compressed by the compressor 2 to become high-temperature high-pressure steam which is used as a heat source of the evaporator 1.
According to the method for improving the concentration degree of the mechanical vapor recompression system, the concentration degree of the liquid-phase re-concentrated material obtained by the heat compensator 4 is 5-20% higher than that of the traditional heat compensation scheme under the condition that the energy consumption of the system is the same.
The method is suitable for an evaporation concentration system of organic matter mixture, aqueous solution and salt solution thereof.
The method is suitable for mechanical vapor recompression systems of non-azeotropic systems of organic matters, water and organic matter mixtures, in particular to concentration systems of ethylene glycol, propylene glycol or diethylene glycol or mixture water solutions thereof.
The heat compensator 4 heats the concentrated material discharged from the mechanical vapor recompression system evaporator 1 by using an external heat source to generate steam, and the generated steam is used as supplementary heat and enters the evaporation system.
The heat compensator 4 heats the concentrated material discharged from the evaporator 1 of the mechanical vapor recompression system by using an external heat source to generate steam, the generated steam is used as supplementary heat, enters the interior of the mechanical vapor recompression system through a secondary steam pipeline before the evaporator 1 or enters the compressor 2 or a pipeline, equipment and the like before an air inlet of the compressor 2, and enters the compressor 2 together with the secondary steam generated by the evaporator 1, and the method includes but is not limited to the following ways: the bottom air inlet of the evaporator 1, the air inlet of the compressor 2, the pipeline before the air inlet of the compressor 2, and the like.
Furthermore, a washing and separating device 9 can be arranged on a pipeline between the evaporator 1 and the inlet of the compressor 2, so as to remove concentrated components in steam generated by evaporation of the evaporator 1 and improve the purity of the steam. The washing and separating device 9 may be a device having a washing and separating function, such as a spray tower, a washing tower, or a rectifying tower.
Example 3
The following describes a heat compensation scheme of the conventional mechanical vapor recompression evaporation system and a new method provided by the present invention in comparison with the accompanying drawing 1:
the existing heat compensation method of the traditional mechanical vapor recompression system comprises the following steps: when the mechanical vapor recompression system needs to supply supplementary heat from the outside because the heat dissipation loss is larger than the work of the vapor compressor 2, a vapor branch pipe is arranged on a pipeline connecting the compressor 2 and the shell pass vapor inlet of the evaporator 1 and used for inputting the external supplementary vapor into the shell pass of the evaporator 1 so as to supplement the heat loss of the system and ensure the normal operation of the system.
Fig. 1 is a schematic flow chart of a system and method for increasing the concentration level of a mechanical vapor recompression system according to the present invention. The process is as follows: when the mechanical vapor recompression system needs to provide supplementary heat from the outside because the heat dissipation loss is larger than that of the vapor compressor 2 to do work, a concentrated material outlet at the bottom of the evaporator 1 is connected with the heat compensator 4, and the concentrated material in the evaporator 1 enters the heat compensator 4 to be heated and then becomes a vapor-liquid two phase; after the vapor-liquid two-phase separation, the vapor phase enters the evaporation system to be used as the supplementary heat of a mechanical vapor recompression system, and enters a vapor compressor 2 together with secondary vapor generated by the evaporator 1 to be used as a heat source of the evaporator 1 after compression and temperature rise; the residual re-concentrated material after being further heated and concentrated by the heat compensator 4 is taken as a concentrated material product and discharged out of the system by the discharge pump 7.
Compared with the heat compensation scheme of the traditional mechanical vapor recompression system and the new method provided by the invention, when the mechanical vapor recompression system needs external additional heat compensation:
adopt current traditional concurrent heating scheme: the external heat compensation is directly used for inputting fresh steam into the shell pass of the evaporator 1 to be used as the heat compensation of the mechanical steam recompression system. Under this kind of scheme, the heat that the external world provided can not heat 1 bottom exhaust concentrated material of evaporimeter, and the heat that the external world provided can't further concentrated the evaporation to concentrated material, and supplementary heat utilization rate is low.
The new method provided by the invention is adopted: external heat supplement directly heats the concentrated material discharged from the bottom of the evaporator 1 to generate steam, and the steam enters a mechanical steam recompression system to serve as supplementary heat. In the scheme provided by the invention, external supplementary heat directly acts on the concentrated material discharged from the bottom of the evaporator 1, the concentrated material is evaporated to generate steam, the concentrated material is further concentrated under the action of the external supplementary heat, and the concentration degree is further improved and is 5-20% higher than that of the traditional heat supplementing scheme; meanwhile, steam generated by the concentrated material under the action of external supplementary heat enters the mechanical steam recompression system to be used as supplementary heat, so that the stable and normal operation of the system is ensured. The new method provided by the invention obviously improves the energy utilization rate of the supplementary heat, has simple and reliable flow, not only ensures the stable and normal operation of the system, but also improves the concentration degree of the concentrated materials of the system.
Fig. 1 is a schematic flow chart of a system and method for increasing the concentration level of a mechanical vapor recompression system according to the present invention. When the mechanical vapor recompression system needs to provide supplementary heat from the outside because the heat dissipation loss is greater than the work of the vapor compressor 2, the system capable of improving the concentration degree of the mechanical vapor recompression system comprises an evaporator 1, the compressor 2, a heat compensator 4 and a discharge pump 7, wherein a concentrated material discharge port at the bottom of the evaporator 1 is connected with the heat compensator 4 through a pipeline; the upper vapor phase outlet of the heat compensator 4 is connected with the bottom vapor phase inlet of the evaporator 1 through a pipeline; the evaporator 1 is connected with an inlet of the compressor 2 through a pipeline, and an outlet of the compressor 2 is connected with a shell-side steam inlet of the evaporator 1 through a pipeline; the outlet of the reconcentrated material at the bottom of the heat compensator 4 is connected with the discharging pump 7 through a pipeline, and the outlet of the discharging pump 7 is divided into two paths: one path is used as circulation and connected with the heat compensator 4 through a pipeline, and the other path is used as discharge and connected with a product storage tank through a pipeline.
A system capable of improving the concentration degree of a mechanical vapor recompression system comprises the following operation flow steps:
s1, feeding the concentrated material at the bottom of the evaporator 1 into the heat compensator 4 through a pipeline, heating the concentrated material by the heat compensator 4 to change the concentrated material into a vapor-liquid two phase, feeding the vapor phase into the evaporator 1 through a pipeline from a vapor phase inlet at the bottom of the evaporator 1, and feeding the vapor phase and the secondary vapor generated by evaporation of the evaporator 1 into the compressor 2 through a pipeline; the steam is compressed by a compressor 2 and then becomes high-temperature high-pressure steam which is used as a heat source of an evaporator 1 and enters the shell pass of the evaporator 1 through a pipeline to heat and evaporate feed liquid; the steam heats the feed liquid to become condensate, the condensate enters the heat exchanger 6 to preheat the feed liquid conveyed by the feed pump 5, and the condensate finally enters the condensate storage tank 10.
S2, heating the concentrated material by the heat compensator 4 to become a gas phase and a liquid phase, and dividing the liquid phase re-concentrated material into two paths by a pipeline through a discharge pump 7: one path enters a heat compensator 4 through a pipeline and enters circulation; one path is discharged to a product storage tank through a pipeline to be used as a discharge. Further, the vapor phase generated by heating the concentrated material by the heat compensator 4 can enter the pipeline through the pipeline, enters the compressor 2 through the pipeline together with the secondary steam generated by the evaporation of the evaporator 1, and is compressed by the compressor 2 to become high-temperature high-pressure steam which is used as a heat source of the evaporator 1. By adopting the method, the built device can be conveniently technically improved.
An automatic flow control system is arranged on a discharge pipeline of the concentrated material at the bottom of the evaporator 1, and a liquid level controller is arranged on the heat compensator 4; the material conveying can adopt a pumping mode, and the gravity conveying, preferably gravity conveying, of the concentrated material can also be realized by adjusting the relative installation positions of the evaporator 1 and the heat compensator 4.
A circulating pipeline is arranged at the outlet of the discharging pump 7 and is used as a forced circulating pipeline of the heat compensator 4; the discharge pipeline of the discharge pump 7 is provided with a flow control system.
The system capable of improving the concentration degree of the mechanical vapor recompression system provided by the invention adopts an automatic control mode, including but not limited to the following control modes: PLC control, DCS control, etc.
It should be noted that, a washing and separating device 9 may be disposed on the pipeline between the evaporator 1 and the inlet of the compressor 2 to remove the concentrated components in the steam generated by evaporation in the evaporator 1 and improve the purity of the steam, and the washing and separating device 9 may be a device having a washing and separating function, such as a spray tower, a washing tower/a rectifying tower, etc.
The system and the method for improving the concentration degree of a mechanical vapor recompression system are described with reference to fig. 1, and when the method is used for treating 10% ethylene glycol solution for concentration, specific parameters are as follows: feeding 2 tons/hour, and concentrating the 10% ethylene glycol solution by a mechanical vapor recompression system to obtain 55% ethylene glycol concentrated solution. When the mechanical steam recompression evaporation system needs to supplement 20KW per hour due to heat loss, the concentration of the obtained concentrated solution can reach 60% by adopting the technical scheme system provided by the invention.
The system and the method for improving the concentration degree of a mechanical vapor recompression system are described with reference to fig. 1, and when the method is used for treating 6% diethylene glycol solution for concentration, the specific parameters are as follows: feeding 2 tons/h, and concentrating the 6% diethylene glycol solution by a mechanical vapor recompression evaporation system to obtain a 60% diethylene glycol concentrated solution. When the mechanical steam recompression evaporation system needs to supplement 20KW per hour due to heat loss, the concentration of the obtained concentrated solution can reach 70% by adopting the heat supplementing technical scheme provided by the invention.
The present invention is schematically described in the above with reference to the drawings, and the system and method for increasing the degree of concentration in a mechanical vapor recompression system are provided. Those skilled in the art will appreciate that other persons may devise similar methods in the light of the teachings of this invention. It is specifically intended that all similar arrangements of the invention be considered as falling within the scope of the invention as claimed, without departing from the central spirit thereof.

Claims (10)

1.一种可提高机械蒸汽再压缩系统浓缩程度的系统,其特征在于:包括蒸发器(1)、压缩机(2)、补热器(4)和出料泵(7),所述蒸发器(1)的底部浓缩物料出料口与所述补热器(4)通过管道相连;所述补热器(4)上部汽相出口与蒸发器(1)底部汽相进口通过管道相连;所述蒸发器(1)与压缩机(2)进口通过管道相连,所述压缩机(2)出口与蒸发器(1)壳程蒸汽进口通过管道连接;所述补热器(4)底部再浓缩物料出料口与出料泵(7)通过管道相连,所述出料泵(7)出口分为两路:一路作为循环通过管道与补热器(4)相连,一路作为出料通过管道与产品储罐(8)相连;1. A system capable of improving the degree of concentration of a mechanical vapor recompression system, characterized in that it comprises an evaporator (1), a compressor (2), a heat supplementary device (4) and a discharge pump (7), the evaporation The concentrated material discharge port at the bottom of the evaporator (1) is connected with the heat supplementary device (4) through a pipeline; the vapor phase outlet at the upper part of the heat supplementary device (4) is connected with the vapor phase inlet at the bottom of the evaporator (1) through a pipeline; The evaporator (1) is connected to the inlet of the compressor (2) through a pipeline, and the outlet of the compressor (2) is connected to the shell-side steam inlet of the evaporator (1) through a pipeline; The discharge port of the concentrated material is connected with the discharge pump (7) through a pipeline, and the outlet of the discharge pump (7) is divided into two paths: one is connected to the heat supplementary device (4) through a pipeline as a circulation, and the other is used as a discharge through a pipeline. connected to the product storage tank (8); 所述蒸发器(1)设置有强制循环系统,浓缩物料也可通过强制循环系统的循环泵出口支路与补热器(4)相连的管道进入补热器(4),管道上设置流量自动控制系统;所述蒸发器(1)与压缩机(2)进口间的管道上设置有洗涤分离装置(9)。The evaporator (1) is provided with a forced circulation system, and the concentrated material can also enter the heat supplementary device (4) through the pipeline connected to the heat supplementary device (4) through the outlet branch of the circulating pump of the forced circulation system. A control system; a washing and separating device (9) is arranged on the pipeline between the evaporator (1) and the inlet of the compressor (2). 2.根据权利要求1所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统,其特征在于:进料储罐(3)通过进料泵(5)与换热器(6)相连,所述换热器(6)与所述蒸发器(1)和冷凝液储箱(10)相连。2. The system according to claim 1, characterized in that: the feed storage tank (3) is connected to the heat exchanger (6) through the feed pump (5), The heat exchanger (6) is connected with the evaporator (1) and the condensate storage tank (10). 3.根据权利要求1所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统,其特征在于:所述蒸发器(1)底部浓缩物料出料口与补热器(4)相连的管道上设置流量自动控制系统,蒸发器(1)底部浓缩物料可采用泵送形式输送,也可通过调整蒸发器(1)与补热器(4)的相对安装位置实现浓缩物料重力自流输送,优选重力自流输送。3. A system for improving the degree of concentration of a mechanical vapor recompression system according to claim 1, characterized in that: a pipeline connecting the outlet of the concentrated material at the bottom of the evaporator (1) to the heat supplementary device (4) An automatic flow control system is installed on the upper part, and the concentrated material at the bottom of the evaporator (1) can be conveyed by pumping, or the concentrated material can be conveyed by gravity by adjusting the relative installation position of the evaporator (1) and the heat supplement (4). Gravity gravity conveying. 4.根据权利要求1所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统,其特征在于:所述补热器(4)设置有液位控制器,所述出料泵(7)出口的循环管道,作为补热器(4)的强制循环管道;出料泵(7)的出料管道设置有流量控制系统。4. A system for improving the concentration degree of a mechanical vapor recompression system according to claim 1, characterized in that: the heat supplement (4) is provided with a liquid level controller, and the discharge pump (7) The circulation pipe at the outlet is used as the forced circulation pipe of the heat supplementer (4); the discharge pipe of the discharge pump (7) is provided with a flow control system. 5.根据权利要求1所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统,其特征在于:所述补热器(4)的形式包含但不限于以下形式:间壁式换热器、电加热器和电磁辐射加热器;所述补热器(4)的外界热源的方式包括但不限于以下方式:电加热、蒸汽加热和热液体介质加热。5. The system according to claim 1, characterized in that: the form of the heat supplementer (4) includes but is not limited to the following forms: a partition heat exchanger, Electric heaters and electromagnetic radiation heaters; the external heat sources of the heater (4) include but are not limited to the following ways: electric heating, steam heating and hot liquid medium heating. 6.一种如权利要求1所述可提高机械蒸汽再压缩系统浓缩程度的系统的方法,其特征在于:包括如下步骤:在机械蒸汽再压缩系统由于热量耗散损失大于压缩机(2)做功而需要外界提供补充热量时,蒸发器(1)底部的浓缩物料出口与补热器(4)相连,蒸发器(1)中的浓缩物料进入补热器(4)加热后变成汽液两相;汽液两相分离后,汽相进入蒸发系统内部作为机械蒸汽再压缩系统的补充热量,并与蒸发器(1)产生的二次蒸汽一起进入压缩机(2),经压缩升温后作为蒸发器(1)热源;经补热器(4)进一步加热浓缩后剩余的再浓缩物料作为浓缩物料产品经出料泵(7)排出系统。6. A method for a system that can improve the degree of concentration of a mechanical vapor recompression system as claimed in claim 1, characterized in that it comprises the following steps: in the mechanical vapor recompression system, the loss due to heat dissipation is greater than the work done by the compressor (2). When supplementary heat is required from the outside, the concentrated material outlet at the bottom of the evaporator (1) is connected to the heater (4), and the concentrated material in the evaporator (1) enters the heater (4) and turns into vapor and liquid after heating. After the vapor-liquid two-phase separation, the vapor phase enters the evaporation system as the supplementary heat of the mechanical vapor recompression system, and enters the compressor (2) together with the secondary vapor generated by the evaporator (1), and is compressed and heated up as Evaporator (1) heat source; the remaining re-concentrated material after further heating and concentration by the heat supplement (4) is discharged from the system through the discharge pump (7) as a concentrated material product. 7.根据权利要求6所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统的方法,其特征在于:具体步骤如下:7. the method for a system that can improve the degree of concentration of the mechanical vapor recompression system according to claim 6, is characterized in that: the concrete steps are as follows: S1、蒸发器(1)底部浓缩物料经管道进入补热器(4),浓缩物料经补热器(4)加热后变成汽液两相,其中的汽相经管道由蒸发器(1)底部汽相进口进入蒸发器(1)内,与蒸发器(1)蒸发产生的二次蒸汽一起通过管道进入压缩机(2);经压缩机(2)压缩后变成高温高压蒸汽,作为蒸发器(1)的热源,通过管道进入蒸发器(1)壳程加热蒸发进料液;蒸汽加热进料液后变成冷凝液,再进入换热器(6)预热由进料泵(5)输送的进料液,冷凝液最后进入冷凝液储罐(10);S1. The concentrated material at the bottom of the evaporator (1) enters the heat supplementary device (4) through the pipeline, and the concentrated material is heated by the heat supplementary device (4) and becomes a vapor-liquid two-phase. The bottom vapor phase inlet enters the evaporator (1), and enters the compressor (2) through the pipeline together with the secondary steam generated by the evaporation of the evaporator (1); after being compressed by the compressor (2), it becomes high-temperature and high-pressure steam, which is used as evaporation. The heat source of the evaporator (1) enters the shell side of the evaporator (1) through the pipeline to heat and evaporate the feed liquid; after the steam heats the feed liquid, it becomes condensed liquid, and then enters the heat exchanger (6) for preheating by the feed pump (5). ), the condensate finally enters the condensate storage tank (10); S2、浓缩物料经补热器(4)加热后变成汽液两相,其中的液相再浓缩物料由管道经出料泵(7)分为两路:一路通过管道进入补热器(4),进入循环;一路通过管道排出至产品储罐(8),作为出料。S2. The concentrated material becomes vapor-liquid two-phase after being heated by the heater (4), and the liquid-phase re-concentrated material is divided into two paths by the pipeline through the discharge pump (7): one path enters the heater (4) through the pipeline ), into the circulation; all the way through the pipeline to discharge to the product storage tank (8), as the discharge. 8.根据权利要求7所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统的方法,其特征在于:所述补热器(4)加热浓缩物料产生的汽相,经管道由包含但不限于以下的途径:蒸发器(1)底部进气口、压缩机(2)进气口、压缩机(2)进气口之前的管道,进入机械蒸汽再压缩系统内部,作为系统补充热量。8. A method for a system that can improve the degree of concentration of a mechanical vapor recompression system according to claim 7, characterized in that: the vapor phase generated by the heat supplement (4) heating the concentrated material is passed through a pipeline containing but It is not limited to the following ways: the air inlet at the bottom of the evaporator (1), the air inlet of the compressor (2), and the pipeline before the air inlet of the compressor (2), which enter the mechanical vapor recompression system to supplement heat for the system. 9.根据权利要求1~5任意一项所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统、权利要求6~8任意一项所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统的方法,其特征在于:本系统或方法适用于有机物混合物及其水溶液及盐溶液的蒸发浓缩系统。9. A system that can improve the degree of concentration of a mechanical vapor recompression system according to any one of claims 1 to 5, and a system that can improve the degree of concentration of a mechanical vapor recompression system according to any one of claims 6 to 8 The method of the system is characterized in that: the system or method is suitable for the evaporation and concentration system of organic mixture and its aqueous solution and salt solution. 10.根据权利要求9所述的一种可提高机械蒸汽再压缩系统浓缩程度的系统或系统的方法,其特征在于:本系统或方法适用于乙二醇、丙二醇或二甘醇或其混合物水溶液的蒸发浓缩系统。10. The method for a system or system that can improve the degree of concentration of a mechanical vapor recompression system according to claim 9, wherein the system or method is suitable for ethylene glycol, propylene glycol or diethylene glycol or an aqueous solution of the mixture thereof evaporative concentration system.
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