CN110538480B - Condensing system and condensing method - Google Patents

Condensing system and condensing method Download PDF

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Publication number
CN110538480B
CN110538480B CN201910913008.XA CN201910913008A CN110538480B CN 110538480 B CN110538480 B CN 110538480B CN 201910913008 A CN201910913008 A CN 201910913008A CN 110538480 B CN110538480 B CN 110538480B
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China
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refrigerant
equipment
heat exchange
valve
temperature
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CN201910913008.XA
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CN110538480A (en
Inventor
张静
黄思远
何龙
孙斌
黄磊
姚迎迎
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Shanghai Electric Group Corp
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Shanghai Electric Group Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0033—Other features
    • B01D5/0036—Multiple-effect condensation; Fractional condensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0033—Other features
    • B01D5/0039—Recuperation of heat, e.g. use of heat pump(s), compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
    • B01D5/0087—Recirculating of the cooling medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
    • B01D61/362—Pervaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
    • B01D61/368—Accessories; Auxiliary operations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/448—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by pervaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/34—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Drying Of Gases (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention relates to a condensation system comprising: compression equipment, waste heat recovery equipment, heat dissipation equipment, drying equipment, first heat transfer equipment, second heat transfer equipment, vapour-liquid separation equipment. And also relates to a condensation method. The heat dissipation device has the advantages that waste heat recovery is carried out, waste heat of high-temperature and high-pressure gas compressed by the compression device is effectively utilized, and power consumption of the heat dissipation device is reduced; performing fractional condensation on the pervaporation gas; the pervaporation gas directly exchanges heat with the refrigerant to condense, and compared with the existing indirect heat exchange condensation through water or other solvents, the pervaporation gas can save equipment investment, operation energy consumption and occupied area.

Description

Condensing system and condensing method
Technical Field
The invention relates to the technical field of pervaporation, in particular to a condensing system and a condensing method applied to a pervaporation membrane system.
Background
Pervaporation (Pervaporation, PV) is a novel membrane separation technology. The technology is used for separating liquid mixture, and has the outstanding advantage of being capable of realizing separation tasks which are difficult to be completed by traditional methods such as distillation, extraction, adsorption and the like with low energy consumption. It is especially suitable for separating near boiling point and constant boiling point mixture which is difficult to separate or can not be separated by common rectification; the method has obvious economic and technical advantages for removing trace water in the organic solvent and the mixed solvent and separating a small amount of organic pollutants in the wastewater. The pervaporation membrane separation technology is to utilize the solubility (thermodynamic property) and diffusivity (kinetic property) of an organic solvent and water (or different components in the solvent) in a compact membrane to enable the water (or a certain component) to permeate the membrane and then vaporize at the other side of the membrane, so as to realize a separation process; the water (or a certain component) is condensed and discharged after being vaporized on the other side of the membrane.
However, pervaporation membrane separation techniques have some drawbacks. If the feed to the membrane module of the pervaporation system is heated to a specific temperature, energy is consumed. The gas vaporized at the other side of the membrane component of the pervaporation system is required to be condensed, and the heat emitted by the condenser is directly discharged into the atmosphere in the refrigeration cycle process of the condensing equipment, so that the heat is lost, and the heat pollution is caused.
In addition, the mixed gas permeates through the vacuum side of the pervaporation membrane component, and how to realize high-efficiency recovery of target substances is a difficult problem in the prior art.
Accordingly, there is a need for a condensing system for a pervaporation membrane system that provides for heat recovery during refrigeration cycles, improved condensing efficiency and target recovery, reduced energy consumption and floor space.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art and provides a condensing system and a condensing method.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a condensing system for use in a pervaporation membrane system, comprising:
compression equipment;
the waste heat recovery device is communicated with the compression device through a pipeline, and a first valve is arranged on the pipeline for communicating the waste heat recovery device with the compression device;
the heat dissipation device is respectively communicated with the compression device and the waste heat recovery device through a pipeline, and a second valve is arranged on the pipeline;
the drying equipment is communicated with the heat dissipation equipment through a pipeline;
the first heat exchange device is communicated with the drying device through a pipeline, and a third valve and a first expansion valve are arranged on the pipeline;
the second heat exchange equipment is respectively communicated with the drying equipment and the first heat exchange equipment through pipelines, and a fourth valve and a second expansion valve are arranged on the pipelines for communicating the second heat exchange equipment and the drying equipment;
The vapor-liquid separation equipment is communicated with the compression equipment, the first heat exchange equipment and the second heat exchange equipment through pipelines respectively.
Preferably, the waste heat recovery apparatus includes:
A feed inlet;
The feeding outlet is communicated with the feeding inlet to form a feeding pipeline;
A first inlet for refrigerant, which is in communication with the compression device via a pipeline, on which the first valve is arranged;
A first refrigerant outlet communicated with the first refrigerant inlet to form a first refrigerant pipeline, wherein the first refrigerant outlet is communicated with the heat dissipation device through a pipeline;
the feed line is not in communication with the refrigerant first line.
Preferably, the heat dissipating device includes:
A refrigerant second inlet communicated with the compression device through a pipeline, the pipeline is provided with the second valve, and the refrigerant second inlet is communicated with the refrigerant first outlet through a pipeline;
and the refrigerant second outlet is communicated with the refrigerant second inlet to form a refrigerant second pipeline, and the refrigerant second outlet is communicated with the drying equipment through a pipeline.
Preferably, the first heat exchange device comprises:
A first inlet for pervaporation gas;
the first pervaporation gas outlet is communicated with the first pervaporation gas inlet to form a first pervaporation gas pipeline;
A third inlet for refrigerant, which is communicated with the drying equipment through a pipeline, and the pipeline is provided with the third valve and the first expansion valve;
A third refrigerant outlet communicated with the third refrigerant inlet to form a third refrigerant pipeline, wherein the third refrigerant outlet is communicated with the vapor-liquid separation equipment through a pipeline;
the pervaporation gas first line is not in communication with the refrigerant third line.
Preferably, the second heat exchange apparatus comprises:
a pervaporation gas second inlet;
The second pervaporation gas outlet is communicated with the second pervaporation gas inlet to form a second pervaporation gas pipeline, and the second pervaporation gas outlet is communicated with the first pervaporation gas inlet through a pipeline;
A fourth refrigerant inlet communicated with the drying device through a pipeline, wherein the pipeline is provided with the fourth valve and the second expansion valve;
A refrigerant fourth outlet communicated with the refrigerant fourth inlet to form a refrigerant fourth pipeline, wherein the refrigerant fourth outlet is communicated with the vapor-liquid separation equipment through a pipeline;
the pervaporation gas second line is not in communication with the refrigerant fourth line.
Preferably, the method further comprises:
And the high-low pressure liquid storage equipment is respectively communicated with the heat dissipation equipment and the drying equipment through pipelines.
Preferably, the method further comprises:
the evaporation pressure regulating valve is arranged on a pipeline which is communicated with the second heat exchange equipment and the vapor-liquid separation equipment.
Preferably, the evaporation pressure regulating valve is arranged on a pipeline which is communicated with the fourth refrigerant outlet of the second heat exchange device and the vapor-liquid separation device.
Preferably, the method further comprises:
the first temperature sensor is arranged on the first heat exchange equipment;
the second temperature sensor is arranged on the second heat exchange equipment;
The third temperature sensor is arranged on the waste heat recovery equipment;
and the fourth temperature sensor is arranged on the heat dissipation device.
Preferably, the first temperature sensor is disposed at the first outlet of the pervaporation gas of the first heat exchange device.
Preferably, the second temperature sensor is disposed at the pervaporation gas second outlet of the second heat exchange device.
Preferably, the third temperature sensor is provided at the feed inlet of the waste heat recovery device.
Preferably, the fourth temperature sensor is disposed at the refrigerant second inlet of the heat dissipating device.
Preferably, the method further comprises:
the sight glass device is arranged on a pipeline which is communicated with the drying device and the first heat exchange device and the second heat exchange device respectively.
Preferably, the method further comprises:
and the fan is arranged on the heat dissipation equipment.
A condensation method, applied to a condensation system as described above, comprising the steps of:
Step S1, under the action of pervaporation gas, the first heat exchange equipment and the second heat exchange equipment vaporize the refrigerant to obtain a first refrigerant, and the first refrigerant is conveyed to the vapor-liquid separation equipment through a pipeline;
s2, performing vapor-liquid separation treatment on the first refrigerant by the vapor-liquid separation equipment to obtain a second refrigerant, and conveying the second refrigerant to the compression equipment through a pipeline;
s3, compressing the second refrigerant by the compression equipment to obtain a third refrigerant, wherein the third refrigerant is conveyed to the heat dissipation equipment and the waste heat recovery equipment through pipelines;
Step S4, after the third refrigerant is subjected to combined treatment of the heat radiating equipment and the waste heat recovery equipment, a fourth refrigerant is obtained, and the fourth refrigerant is conveyed to the drying equipment through a pipeline;
And S5, drying the fourth refrigerant by the drying equipment to obtain the refrigerant, and conveying the refrigerant to the first heat exchange equipment and the second heat exchange equipment through pipelines.
Preferably, in step S1, the following steps are included:
step S110, opening the third valve and the fourth valve, wherein the refrigerant respectively enters the first heat exchange device and the second heat exchange device after passing through the first expansion valve and the second expansion valve, and the pervaporation gas sequentially enters the second heat exchange device and the first heat exchange device and exchanges heat with the refrigerant;
Step S120, detecting a first temperature of the pervaporation gas at a first boil-off gas outlet of the first heat exchange device by a first temperature sensor, and detecting a second temperature of the pervaporation gas at a second boil-off gas outlet of the second heat exchange device by a second temperature sensor;
step S130, comparing the first temperature with a first preset value, and comparing the second temperature with a second preset value:
If the first temperature is greater than the first preset value, opening the third valve, and if the first temperature is equal to the first preset value, closing the third valve;
If the second temperature is greater than the second preset value, opening the fourth valve, and if the second temperature is equal to the second preset value, closing the fourth valve;
And closing the third valve, the fourth valve and the compression device if the first temperature and the second temperature are equal to the first preset value and the second preset value at the same time.
Preferably, the first preset value is greater than the second preset value.
Preferably, in the step S110, the following steps are included:
Step S111, adjusting the first expansion valve and the second expansion valve to make the temperature of the refrigerant entering the first heat exchange device smaller than the temperature of the refrigerant entering the second heat exchange device;
Step S112, in the second heat exchange equipment, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant, and in the first heat exchange equipment, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant;
Step S113, adjusting the pressure of the first refrigerant output by the second heat exchange device by an evaporation pressure adjusting valve, where the first refrigerant output by the second heat exchange device is mixed with the first refrigerant output by the first heat exchange device, and then is conveyed to the vapor-liquid separation device through a pipeline.
Preferably, in step S4, the following steps are included:
step S410, feeding the feed of the pervaporation system into the waste heat recovery device, and feeding air into the heat dissipation device;
step S420, detecting a third temperature of the feed material by a third temperature sensor;
step S430, comparing the third temperature with a third preset value:
If the third temperature is lower than a third preset value, opening the first valve, closing the second valve, enabling the third refrigerant to sequentially enter the waste heat recovery device and the heat dissipation device, and sequentially carrying out heat exchange with the feeding and the air to obtain the fourth refrigerant, wherein the fourth refrigerant is conveyed to the drying device through a pipeline;
If the third temperature is higher than the third preset value, opening the second valve, closing the first valve, and enabling the third refrigerant to enter the heat radiating equipment;
Step S440, detecting a fourth temperature of the third refrigerant at the second refrigerant inlet of the heat dissipating device by a fourth temperature sensor;
Step S450, comparing the fourth temperature with a fourth preset value:
If the fourth temperature is higher than the fourth preset value, starting a fan of the heat radiating equipment, and performing heat exchange on the third refrigerant and the air to obtain a fourth refrigerant, wherein the fourth refrigerant is conveyed to the drying equipment through a pipeline;
And if the fourth temperature is lower than the fourth preset value, the fan of the heat radiating device is turned off, the third refrigerant does not need to exchange heat with the air, and the third refrigerant is conveyed to the drying device through a pipeline.
Preferably, in the step S4, the fourth refrigerant is transferred to a high-low pressure liquid storage device through a pipe, and the high-low pressure liquid storage device transfers the fourth refrigerant to the drying device through a pipe.
Compared with the prior art, the invention has the following technical effects:
According to the condensing system and the condensing method, waste heat recovery is carried out, waste heat of high-temperature and high-pressure gas compressed by the compression equipment is effectively utilized, and power consumption of the heat dissipation equipment is reduced; performing fractional condensation on the pervaporation gas; the pervaporation gas directly exchanges heat with the refrigerant to condense, and compared with the existing indirect heat exchange condensation through water or other solvents, the pervaporation gas can save equipment investment, operation energy consumption and occupied area.
Drawings
FIG. 1 is a schematic diagram of an exemplary embodiment of the present invention.
Wherein the reference numerals are as follows: compression equipment 1, a first valve 2, a second valve 3, waste heat recovery equipment 4, heat dissipation equipment 5, a fan 6, high-low pressure liquid storage equipment 7, drying equipment 8, mirror equipment 9, a third valve 10, a first expansion valve 11, a first temperature sensor 12, a first heat exchange equipment 13, a fourth valve 14, a second expansion valve 15, a second temperature sensor 16, a second heat exchange equipment 17, an evaporation pressure regulating valve 18, a vapor-liquid separation equipment 19, a third temperature sensor 20 and a fourth temperature sensor 21.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Examples
In an exemplary embodiment of the present invention, as shown in fig. 1, a condensing system includes a compression device 1, a heat recovery device 4, a heat dissipation device 5, a drying device 8, a first heat exchange device 13, a second heat exchange device 17, and a vapor-liquid separation device 19, where the compression device 1 is respectively in communication with the heat recovery device 4, the heat dissipation device 5, and the vapor-liquid separation device 19 through pipes, the heat recovery device 4 is in communication with the heat dissipation device 5 through pipes, the drying device 8 is respectively in communication with the heat dissipation device 5, the first heat exchange device 13, and the second heat exchange device 17 through pipes, and the vapor-liquid separation device 19 is respectively in communication with the first heat exchange device 13, the second heat exchange device 17, and the compression device 1 through pipes.
The compression apparatus 1 includes a compression inlet provided at a lower portion of the compression apparatus 1 and a compression outlet provided at an upper portion of the compression apparatus 1.
Further, the compression apparatus 1 is a compressor.
The waste heat recovery device 4 comprises a feed inlet, a feed outlet, a first refrigerant inlet and a first refrigerant outlet, wherein the feed inlet and the first refrigerant outlet are arranged at the lower part of the waste heat recovery device 4, the feed outlet and the first refrigerant inlet are arranged at the upper part of the waste heat recovery device 4, the feed inlet and the feed outlet are communicated through pipelines to form a feed pipeline, the first refrigerant inlet and the first refrigerant outlet are communicated through pipelines to form a first refrigerant pipeline, and the feed pipeline is not communicated with the first refrigerant pipeline.
The first inlet of the refrigerant is communicated with the compression outlet of the compression device 1 through a pipeline, and the first outlet of the refrigerant is communicated with the heat dissipation device 5 through a pipeline.
A first valve 2 is provided in the line where the first inlet for refrigerant communicates with the compressed outlet.
Further, the first valve 2 is a solenoid valve.
Further, a third temperature sensor 20 is provided at the feed inlet of the waste heat recovery device 4 for detecting the feed temperature.
The heat dissipating device 5 includes an air inlet, an air outlet, a refrigerant second inlet and a refrigerant second outlet, the air inlet and the refrigerant second inlet are disposed at a lower portion of the heat dissipating device 5, the air outlet and the refrigerant second outlet are disposed at an upper portion of the heat dissipating device 5, the air inlet and the air outlet are communicated to form an air pipe, the refrigerant second inlet and the refrigerant second outlet are communicated to form a refrigerant second pipe, and the air pipe is not communicated with the refrigerant second pipe.
The second inlet of the refrigerant is communicated with the compression outlet of the compression device 1 through a pipeline, the second inlet of the refrigerant is communicated with the first outlet of the waste heat recovery device 4 through a pipeline, and the second outlet of the refrigerant is communicated with the drying device 8 through a pipeline.
A second valve 3 is provided on the line where the second inlet for refrigerant communicates with the compression outlet.
Further, the heat sink 5 further includes a fan 6, the fan 6 being provided at an upper portion of the heat sink 5, cool air being introduced from an air inlet and hot air being discharged from an air outlet by the fan 6.
Further, the second valve 3 is a solenoid valve.
Further, a fourth temperature sensor 21 is provided at the second inlet position of the refrigerant of the heat dissipating device 5 for detecting the temperature of the third refrigerant.
The drying device 8 comprises a drying inlet and a drying outlet, the drying inlet is communicated with the refrigerant second outlet of the heat dissipation device 5 through a pipeline, and the drying outlet is respectively communicated with the first heat exchange device 13 and the second heat exchange device 17 through pipelines.
Further, the drying device 8 is a dryer.
Further, the condensing system further comprises a high-low pressure liquid storage device 7, and the high-low pressure liquid storage device 7 is respectively communicated with the heat dissipation device 5 and the drying device 8 through pipelines.
The high-low pressure liquid storage device 7 comprises a liquid storage inlet and a liquid storage outlet, wherein the liquid storage inlet is communicated with a refrigerant second outlet of the heat dissipation device 5 through a pipeline, and the liquid storage outlet is communicated with a drying inlet of the drying device 8 through a pipeline.
The first heat exchange device 13 comprises a first pervaporation gas inlet, a first pervaporation gas outlet, a third refrigerant inlet and a third refrigerant outlet, the first pervaporation gas inlet is arranged at the lower part of the first heat exchange device 13, the first pervaporation gas outlet is arranged at the upper part of the first heat exchange device 13, the third refrigerant inlet is arranged at the top of the first heat exchange device 13, the third refrigerant outlet is arranged at the bottom of the first heat exchange device 13, the first pervaporation gas inlet and the first pervaporation gas outlet are communicated to form a first pervaporation gas pipeline, the third refrigerant inlet and the third refrigerant outlet are communicated to form a third refrigerant pipeline, and the first pervaporation gas pipeline is not communicated with the third refrigerant pipeline.
The third inlet of the refrigerant is communicated with the drying outlet of the drying device 8 through a pipeline, the third outlet of the refrigerant is communicated with the vapor-liquid separation device 19 through a pipeline, and the first inlet of the pervaporation gas is communicated with the second heat exchange device 17 through a pipeline.
A third valve 10 and a first expansion valve 11 are sequentially arranged on a pipeline with a third inlet of the refrigerant communicated with the drying outlet, wherein the third valve 10 is arranged at the upstream of the pipeline, and the first expansion valve 11 is arranged at the downstream of the pipeline.
A first temperature sensor 12 is provided at the first outlet location of the pervaporated gas.
Further, the third valve 10 is a solenoid valve.
The second heat exchange device 17 includes a second inlet of pervaporation gas, a second outlet of pervaporation gas, a fourth inlet of refrigerant and a fourth outlet of refrigerant, the second inlet of pervaporation gas is arranged at the lower part of the second heat exchange device 17, the second outlet of pervaporation gas is arranged at the upper part of the second heat exchange device 17, the fourth inlet of refrigerant is arranged at the top of the second heat exchange device 17, the fourth outlet of refrigerant is arranged at the bottom of the second heat exchange device 17, the second inlet of pervaporation gas and the second outlet of pervaporation gas are communicated to form a first pipeline of pervaporation gas, the fourth inlet of refrigerant is communicated with the fourth outlet of refrigerant to form a fourth pipeline of refrigerant, and the second pipeline of pervaporation gas is not communicated with the fourth pipeline of refrigerant.
The fourth inlet of the refrigerant is communicated with the drying outlet of the drying device 8 through a pipeline, the fourth outlet of the refrigerant is communicated with the vapor-liquid separation device 19 through a pipeline, and the second outlet of the pervaporation gas is communicated with the first inlet of the pervaporation gas of the second heat exchange device 17 through a pipeline.
A fourth valve 14 and a second expansion valve 15 are sequentially arranged on a pipeline with a fourth refrigerant inlet communicated with the drying outlet, wherein the fourth valve 14 is arranged at the upstream of the pipeline, and the second expansion valve 15 is arranged at the downstream of the pipeline.
A second temperature sensor 16 is provided at the second outlet location of the pervaporation gas.
Further, the fourth valve 14 is a solenoid valve.
Further, the condensing system also comprises a sight glass device 9, the sight glass device 9 being arranged on a pipeline of the drying device 8 in communication with the first heat exchanging device 13 and the second heat exchanging device 17, respectively.
Specifically, the drying outlet of the drying device 8 is communicated with a main pipeline, the main pipeline is respectively communicated with two pipelines, one pipeline is communicated with the first heat exchange device 13, the other pipeline is communicated with the second heat exchange device 17, the sight glass device 9 is arranged on the main pipeline, the third valve 10 and the first expansion valve 11 are arranged on one branch pipeline, and the fourth valve 14 and the second expansion valve 15 are arranged on the other branch pipeline.
The vapor-liquid separation device 19 includes a separation inlet and a separation outlet, the separation inlet is respectively communicated with the third outlet of the refrigerant of the first heat exchange device 13 and the fourth outlet of the refrigerant of the second heat exchange device 17 through pipelines, and the separation outlet is communicated with the compression inlet of the compression device 1 through pipelines.
Further, the condensing system further comprises an evaporating pressure adjusting valve 18, and the evaporating pressure adjusting valve 18 is arranged on a pipeline of the second heat exchange device 17 communicated with the vapor-liquid separation device 19.
Further, the first valve 2, the second valve 3, the third valve 10, the fourth valve 14 and the compression device 1 are controlled by the PLC.
The condensing method applied to the condensing system comprises the following steps:
Step S1, under the action of pervaporation gas, the first heat exchange equipment 13 and the second heat exchange equipment 17 vaporize the refrigerant to obtain a first refrigerant, and the first refrigerant is conveyed to the vapor-liquid separation equipment 19 through a pipeline;
Step S2, the vapor-liquid separation equipment 19 performs vapor-liquid separation treatment on the first refrigerant to obtain a second refrigerant, and the second refrigerant is conveyed to the compression equipment 1 through a pipeline;
step S3, the compression equipment 1 compresses the second refrigerant to obtain a third refrigerant, and the third refrigerant is conveyed to the heat dissipation equipment 5 and the waste heat recovery equipment 4 through pipelines;
Step S4, after the third refrigerant is subjected to combined treatment of the heat radiating equipment 5 and the waste heat recovery equipment 4, a fourth refrigerant is obtained, and the fourth refrigerant is conveyed to the drying equipment 8 through a pipeline;
in step S5, the drying device 8 performs drying treatment on the fourth refrigerant to obtain a refrigerant, and the refrigerant is conveyed to the first heat exchange device 13 and the second heat exchange device 17 through pipelines.
Further, in step S110, the third valve 10 and the fourth valve 14 are opened, the refrigerant passes through the first expansion valve 11 and the second expansion valve 15 and then enters the first heat exchange device 13 and the second heat exchange device 17 respectively, and the pervaporation gas sequentially enters the second heat exchange device 17 and the first heat exchange device 13 and exchanges heat with the refrigerant;
step S120, detecting a first temperature of the pervaporation gas at the first boil-off gas outlet of the first heat exchange device 13 by the first temperature sensor 12, and detecting a second temperature of the pervaporation gas at the second boil-off gas outlet of the second heat exchange device 17 by the second temperature sensor 16;
step S130, comparing the first temperature with a first preset value, and comparing the second temperature with a second preset value:
if the first temperature is greater than the first preset value, opening the third valve 10, and if the first temperature is equal to the first preset value, closing the third valve 10;
opening the fourth valve 14 if the second temperature is greater than a second preset value, and closing the fourth valve 14 if the second temperature is equal to the second preset value;
If the first and second temperatures are equal to the first and second preset values, respectively, the third valve 10, the fourth valve 14 and the compression device are closed.
Further, the first preset value is greater than the second preset value.
Further, in step S110, the following steps are included:
Step S111, adjusting the first expansion valve 11 and the second expansion valve 15 so that the temperature of the refrigerant entering the first heat exchange device 13 is smaller than the temperature of the refrigerant entering the second heat exchange device 17;
Step S112, in the second heat exchange equipment 17, the refrigerant exchanges heat with the pervaporation gas to obtain a first refrigerant, and in the first heat exchange equipment 13, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant;
In step S113, the pressure of the first refrigerant output by the second heat exchange device 17 is adjusted by the evaporating pressure adjusting valve 18, and the first refrigerant output by the second heat exchange device 17 is mixed with the first refrigerant output by the first heat exchange device 13 and then is sent to the vapor-liquid separation device through a pipeline.
Further, in step S4, the following steps are included:
step S410, feeding materials of the pervaporation system enter waste heat recovery equipment 4, and air enters heat dissipation equipment 5;
step S420, detecting a third temperature of the feed material by a third temperature sensor 20;
step S430, comparing the third temperature with a third preset value:
If the third temperature is lower than a third preset value, opening the first valve 2, closing the second valve 3, and enabling the third refrigerant to sequentially enter the waste heat recovery device 4 and the heat dissipation device 5, wherein the third refrigerant sequentially exchanges heat with the feed and the air to obtain a fourth refrigerant, and the fourth refrigerant is conveyed to the drying device 8 through a pipeline;
If the third temperature is higher than a third preset value, the second valve 3 is opened, the first valve 2 is closed, the third refrigerant enters the heat radiating equipment 5, the third refrigerant exchanges heat with air to obtain a fourth refrigerant, and the fourth refrigerant is conveyed to the drying equipment 8 through a pipeline;
Step S440, detecting a fourth temperature of the third refrigerant of the second inlet of the refrigerant of the heat dissipating device 5 by the fourth temperature sensor 21;
Step S450, comparing the fourth temperature with a fourth preset value:
if the fourth temperature is higher than the fourth preset value, a fan 6 of the heat radiating device 5 is started, and the third refrigerant exchanges heat with air to obtain a fourth refrigerant, and the fourth refrigerant is conveyed to the drying device 8 through a pipeline;
If the fourth temperature is lower than the fourth preset value, the fan 6 of the heat dissipating device 5 is turned off, the third refrigerant does not need to exchange heat with air, and the third refrigerant is delivered to the drying device 8 through the pipe.
Further, in step S4, the fourth refrigerant is sent to the high-low pressure liquid storage device 7 through a pipe, and the high-low pressure liquid storage device 7 sends the fourth refrigerant to the drying device 8 through a pipe.
Further, in step S4, the third refrigerant is sent to the high-low pressure liquid storage device 7 through a pipe, and the high-low pressure liquid storage device 7 sends the third refrigerant to the drying device 8 through a pipe.
The invention has the advantages that the heat exchange is carried out by utilizing the high-pressure gas processed by the compressor and the feed of the pervaporation system, so that the waste heat recovery is realized, and the power consumption of the heat dissipation equipment is reduced; the refrigerant is directly subjected to heat exchange condensation with the pervaporation gas, the first heat exchange equipment and the second heat exchange equipment are utilized for fractional condensation, the low-boiling-point gas is firstly condensed, and the high-boiling-point gas is then condensed, so that the recycling of the high-purity organic liquid is realized.
Examples
This embodiment is a practical application of the condensing system of the present invention.
Adding 10% N, N-Dimethylformamide (DMF) wastewater into a feed tank of a pervaporation membrane system, starting a feed circulation pump, a heater and a condensation system, heating the feed temperature to a set temperature of 50 ℃ through electric heating and condensation waste heat recovery, then turning off the electric heating, and maintaining the feed temperature at the set temperature of 50 ℃ through waste heat recovery and heat preservation; the first-stage condensation temperature (second heat exchange equipment 17) of the condensation system is set to be 10 ℃, the second-stage condensation temperature (first heat exchange equipment 13) is set to be 0 ℃, then a vacuum pump is started, DMF permeates through the pervaporation membrane and is condensed and recovered, the DMF content of the first-stage condensate reaches 50%, the DMF content of the second-stage condensate reaches 5%, and the DMF content of the second-stage condensate returns to the feeding tank again for further pervaporation.
Through the technical scheme, the energy consumption is reduced by 30%, the DMF recovery rate reaches 80%, and the condensation efficiency reaches 95%.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included within the scope of the present invention.

Claims (7)

1. A condensing system for use in a pervaporation membrane system, comprising:
compression equipment;
the waste heat recovery device is communicated with the compression device through a pipeline, and a first valve is arranged on the pipeline for communicating the waste heat recovery device with the compression device;
the heat dissipation device is respectively communicated with the compression device and the waste heat recovery device through a pipeline, and a second valve is arranged on the pipeline;
the drying equipment is communicated with the heat dissipation equipment through a pipeline;
the high-low pressure liquid storage device is respectively communicated with the heat dissipation device and the drying device through pipelines;
the first heat exchange device is communicated with the drying device through a pipeline, and a third valve and a first expansion valve are arranged on the pipeline;
the second heat exchange equipment is respectively communicated with the drying equipment and the first heat exchange equipment through pipelines, and a fourth valve and a second expansion valve are arranged on the pipelines for communicating the second heat exchange equipment and the drying equipment;
the vapor-liquid separation equipment is communicated with the compression equipment, the first heat exchange equipment and the second heat exchange equipment through pipelines respectively;
the condensing method adopting the condensing system comprises the following steps:
Step S1, under the action of pervaporation gas, the first heat exchange equipment and the second heat exchange equipment vaporize the refrigerant to obtain a first refrigerant, and the first refrigerant is conveyed to the vapor-liquid separation equipment through a pipeline;
s2, performing vapor-liquid separation treatment on the first refrigerant by the vapor-liquid separation equipment to obtain a second refrigerant, and conveying the second refrigerant to the compression equipment through a pipeline;
s3, compressing the second refrigerant by the compression equipment to obtain a third refrigerant, wherein the third refrigerant is conveyed to the heat dissipation equipment and the waste heat recovery equipment through pipelines;
Step S4, after the third refrigerant is subjected to combined treatment of the heat radiating equipment and the waste heat recovery equipment, a fourth refrigerant is obtained, and the fourth refrigerant is conveyed to the drying equipment through a pipeline;
S5, drying the fourth refrigerant by the drying equipment to obtain the refrigerant, and conveying the refrigerant to the first heat exchange equipment and the second heat exchange equipment through pipelines;
in step S1, the following steps are included:
step S110, opening the third valve and the fourth valve, wherein the refrigerant respectively enters the first heat exchange device and the second heat exchange device after passing through the first expansion valve and the second expansion valve, and the pervaporation gas sequentially enters the second heat exchange device and the first heat exchange device and exchanges heat with the refrigerant;
Step S120, detecting a first temperature of the pervaporation gas at a first boil-off gas outlet of the first heat exchange device by a first temperature sensor, and detecting a second temperature of the pervaporation gas at a second boil-off gas outlet of the second heat exchange device by a second temperature sensor;
step S130, comparing the first temperature with a first preset value, and comparing the second temperature with a second preset value:
If the first temperature is greater than the first preset value, opening the third valve, and if the first temperature is equal to the first preset value, closing the third valve;
If the second temperature is greater than the second preset value, opening the fourth valve, and if the second temperature is equal to the second preset value, closing the fourth valve;
closing the third valve, the fourth valve and the compression device if the first temperature and the second temperature are equal to the first preset value and the second preset value respectively;
wherein the first preset value is greater than the second preset value.
2. The condensing system of claim 1, further comprising:
the evaporation pressure regulating valve is arranged on a pipeline which is communicated with the second heat exchange equipment and the vapor-liquid separation equipment.
3. The condensing system of claim 1, further comprising:
the first temperature sensor is arranged on the first heat exchange equipment;
the second temperature sensor is arranged on the second heat exchange equipment;
The third temperature sensor is arranged on the waste heat recovery equipment;
and the fourth temperature sensor is arranged on the heat dissipation device.
4. The condensing system of claim 1, further comprising:
The sight glass device is arranged on a pipeline for communicating the drying device with the first heat exchange device and the second heat exchange device respectively;
and the fan is arranged on the heat dissipation equipment.
5. The condensing system according to claim 1, characterized by comprising, in said step S110, the steps of:
Step S111, adjusting the first expansion valve and the second expansion valve to make the temperature of the refrigerant entering the first heat exchange device smaller than the temperature of the refrigerant entering the second heat exchange device;
Step S112, in the second heat exchange equipment, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant, and in the first heat exchange equipment, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant;
Step S113, adjusting the pressure of the first refrigerant output by the second heat exchange device by an evaporation pressure adjusting valve, where the first refrigerant output by the second heat exchange device is mixed with the first refrigerant output by the first heat exchange device, and then is conveyed to the vapor-liquid separation device through a pipeline.
6. The condensation system according to claim 1, characterized in that in step S4, it comprises the steps of:
step S410, feeding the feed of the pervaporation system into the waste heat recovery device, and feeding air into the heat dissipation device;
step S420, detecting a third temperature of the feed material by a third temperature sensor;
step S430, comparing the third temperature with a third preset value:
If the third temperature is lower than a third preset value, opening the first valve, closing the second valve, enabling the third refrigerant to sequentially enter the waste heat recovery device and the heat dissipation device, and sequentially carrying out heat exchange with the feeding and the air to obtain the fourth refrigerant, wherein the fourth refrigerant is conveyed to the drying device through a pipeline;
If the third temperature is higher than the third preset value, opening the second valve, closing the first valve, and enabling the third refrigerant to enter the heat radiating equipment;
Step S440, detecting a fourth temperature of the third refrigerant at the second refrigerant inlet of the heat dissipating device by a fourth temperature sensor;
Step S450, comparing the fourth temperature with a fourth preset value:
If the fourth temperature is higher than the fourth preset value, starting a fan of the heat radiating equipment, and performing heat exchange on the third refrigerant and the air to obtain a fourth refrigerant, wherein the fourth refrigerant is conveyed to the drying equipment through a pipeline;
And if the fourth temperature is lower than the fourth preset value, the fan of the heat radiating device is turned off, the third refrigerant does not need to exchange heat with the air, and the third refrigerant is conveyed to the drying device through a pipeline.
7. The condensing system of claim 1, wherein in step S4, the fourth refrigerant is piped to a high-low pressure storage device that pipes the fourth refrigerant to the drying device.
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