阅读说明：本技术 一种冷凝系统及冷凝方法 (condensing system and condensing method ) 是由 张静 黄思远 何龙 孙斌 黄磊 姚迎迎 于 2019-09-25 设计创作，主要内容包括：本发明涉及一种冷凝系统,包括：压缩设备、余热回收设备、散热设备、干燥设备、第一换热设备、第二换热设备、汽液分离设备。还涉及一种冷凝方法。其优点在于,进行余热回收,有效利用压缩设备压缩后的高温高压气体的余热,散热设备功耗降低；对渗透汽化气体进行分级冷凝；渗透汽化气体直接与制冷剂进行换热冷凝,与现有的通过水或其他溶剂间接进行换热冷凝相比较,能够节省设备投资、运行能耗和占地面积。(the invention relates to a condensation system comprising: the system comprises a compression device, a waste heat recovery device, a heat dissipation device, a drying device, a first heat exchange device, a second heat exchange device and a vapor-liquid separation device. Also relates to a condensation method. The waste heat recovery device has the advantages that the waste heat recovery is carried out, the waste heat of the high-temperature and high-pressure gas compressed by the compression device is effectively utilized, and the power consumption of the heat dissipation device is reduced; carrying out fractional condensation on the permeation vaporized gas; the infiltration vaporized gas directly carries out the heat transfer condensation with the refrigerant, compares with the current indirect heat transfer condensation that carries on of water or other solvents, can save equipment investment, operation energy consumption and area.)

1. A condensing system for use with a pervaporation membrane system, comprising:

A compression device;

The waste heat recovery device is communicated with the compression device through a pipeline, and a first valve is arranged on the pipeline which is communicated with the waste heat recovery device and the compression device;

The heat dissipation equipment is respectively communicated with the compression equipment and the waste heat recovery equipment 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 equipment is communicated with the drying equipment 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 pipeline communicated with the second heat exchange equipment and the drying equipment;

and the gas-liquid separation equipment is respectively communicated with the compression equipment, the first heat exchange equipment and the second heat exchange equipment through pipelines.

2. the condensing system of claim 1, further comprising:

and the high-low pressure liquid storage equipment is communicated with the heat dissipation equipment and the drying equipment through pipelines respectively.

3. the condensing system of claim 1, further comprising:

and the evaporation pressure regulating valve is arranged on a pipeline for communicating the second heat exchange equipment with the vapor-liquid separation equipment.

4. 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;

a third temperature sensor disposed at the waste heat recovery device;

A fourth temperature sensor disposed at the heat sink.

5. The condensing system of claim 1, further comprising:

the sight glass equipment is arranged on a pipeline which is communicated with the drying equipment and the first heat exchange equipment and the second heat exchange equipment respectively;

A fan disposed at the heat sink.

6. A condensation method applied to the condensation system as claimed in any one of claims 1 to 5, characterized by comprising the following steps:

step S1, under the action of permeation vaporization gas, the first heat exchange device and the second heat exchange device vaporize refrigerants to obtain a first refrigerant, and the first refrigerant is conveyed to the vapor-liquid separation device through a pipeline;

Step S2, the vapor-liquid separation device performs vapor-liquid separation on the first refrigerant to obtain a second refrigerant, and the second refrigerant is sent to the compression device through a pipeline;

Step S3, the compression device compresses the second refrigerant to obtain a third refrigerant, and the third refrigerant is sent to the heat dissipation device and the waste heat recovery device through a pipeline;

step S4, after the third refrigerant is processed by the combination of the heat dissipation device and the waste heat recovery device, obtaining a fourth refrigerant, and the fourth refrigerant is conveyed to the drying device through a pipeline;

step S5, after the drying device performs drying processing on the fourth refrigerant, the refrigerant is obtained, and the refrigerant is sent to the first heat exchange device and the second heat exchange device through a pipeline.

7. a condensation method according to claim 6, characterized by comprising, in step S1, the steps of:

Step S110, opening the third valve and the fourth valve, wherein the refrigerant passes through the first expansion valve and the second expansion valve and then enters the first heat exchange device and the second heat exchange device, and the permeated vaporized 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 gasification gas outlet of the first heat exchange device through a first temperature sensor, and detecting a second temperature of the pervaporation gas at a second gasification gas outlet of the second heat exchange device through 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 higher 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 higher than the second preset value, the fourth valve is opened, and if the second temperature is equal to the second preset value, the fourth valve is closed;

If the first temperature and the second temperature are respectively equal to the first preset value and the second preset value at the same time, closing the third valve, the fourth valve and the compression equipment;

Wherein the first preset value is greater than the second preset value.

8. a condensation method according to claim 7, characterized by comprising, in said step S110, the steps of:

step S111, adjusting the first expansion valve and the second expansion valve to enable the temperature of the refrigerant entering the first heat exchange device to be lower than the temperature of the refrigerant entering the second heat exchange device;

Step S112, in the second heat exchange device, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant, and in the first heat exchange device, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant;

step S113, the pressure of the first refrigerant output by the second heat exchange equipment is adjusted through an evaporation pressure adjusting valve, and the first refrigerant output by the second heat exchange equipment and the first refrigerant output by the first heat exchange equipment are mixed and then are conveyed to the vapor-liquid separation equipment through a pipeline.

9. a condensation method according to claim 6, characterized by comprising, in step S4, the steps of:

s410, feeding the feed of the pervaporation system into the waste heat recovery equipment, and feeding air into the heat dissipation equipment;

Step S420, detecting a third temperature of the feeding material through 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, and enabling the third refrigerant to sequentially enter the waste heat recovery device and the heat dissipation device, 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 through a pipeline;

If the third temperature is higher than the third preset value, opening the second valve, closing the first valve, and allowing the third refrigerant to enter the heat dissipation equipment;

step S440 of detecting a fourth temperature of the third refrigerant at a second refrigerant inlet of the heat sink through 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, a fan of the heat dissipation device is started, the third refrigerant and the air are subjected to heat exchange to obtain a fourth refrigerant, and the fourth refrigerant is conveyed to the drying device through a pipeline;

if the fourth temperature is lower than the fourth preset value, the fan of the heat dissipation 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.

10. a condensation method according to claim 6 or 9, wherein in step S4, the fourth refrigerant is delivered through a line to a high-low pressure liquid storage device which delivers the fourth refrigerant through a line to the drying device.

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 (PV) is a new membrane separation technology. The technology is used for separating liquid mixture, and has the outstanding advantage 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 the separation of the mixture with near boiling point and constant boiling point 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 organic solvents and mixed solvents and separating a small amount of organic pollutants in wastewater. The pervaporation membrane separation technology is to utilize the difference of 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 on the other side of the membrane, thereby realizing the separation process; water (or a component) is vaporized on the other side of the membrane and then needs to be condensed and discharged.

However, pervaporation membrane separation techniques suffer from several drawbacks. For example, the membrane module feed of the pervaporation system needs to be heated to a specific temperature, and energy is consumed. The gas vaporized at the other side of the membrane module of the pervaporation system needs to be condensed, and the heat emitted by the condenser in the process of refrigeration cycle by the condensing equipment is directly discharged into the atmosphere, so that the heat is lost, and the thermal pollution is caused.

In addition, the permeation of the mixed gas on the vacuum side of the pervaporation membrane module is a problem in the prior art how to realize the high-efficiency recovery of the target substance.

Therefore, there is a need for a condensing system for a pervaporation membrane system that recovers heat during a refrigeration cycle, improves condensing efficiency and target recovery, and reduces energy consumption and footprint.

disclosure of Invention

the invention aims to provide a condensing system and a condensing method aiming at the defects in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that:

A condensing system for use with a pervaporation membrane system comprising:

A compression device;

the waste heat recovery device is communicated with the compression device through a pipeline, and a first valve is arranged on the pipeline which is communicated with the waste heat recovery device and the compression device;

The heat dissipation equipment is respectively communicated with the compression equipment and the waste heat recovery equipment 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 equipment is communicated with the drying equipment 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 pipeline communicated with the second heat exchange equipment and the drying equipment;

and the gas-liquid separation equipment is respectively communicated with the compression equipment, the first heat exchange equipment and the second heat exchange equipment through pipelines.

preferably, the waste heat recovery apparatus includes:

A feed inlet;

A feed outlet in communication with the feed inlet to form a feed line;

the first refrigerant inlet is communicated with the compression equipment through a pipeline, and the first valve is arranged on the pipeline;

the first refrigerant outlet is communicated with the first refrigerant inlet to form a first refrigerant pipeline, and the first refrigerant outlet is communicated with the heat dissipation equipment through a pipeline;

the feed line is not in communication with the first refrigerant line.

Preferably, the heat dissipating apparatus includes:

the second refrigerant inlet is communicated with the compression equipment through a pipeline, the second valve is arranged on the pipeline, and the second refrigerant inlet is communicated with the first refrigerant outlet through a pipeline;

And the second refrigerant outlet is communicated with the second refrigerant inlet to form a second refrigerant pipeline, and the second refrigerant outlet is communicated with the drying equipment through a pipeline.

preferably, the first heat exchange device comprises:

a pervaporation gas first inlet;

the first pervaporation gas outlet is communicated with the first pervaporation gas inlet to form a first pervaporation gas pipeline;

The third refrigerant inlet is communicated with the drying equipment through a pipeline, and the third valve and the first expansion valve are arranged on the pipeline;

a third refrigerant outlet communicated with the third refrigerant inlet to form a third refrigerant line, the third refrigerant outlet being communicated with the vapor-liquid separation device through a line;

The pervaporation gas first line is not communicated with the refrigerant third line.

preferably, the second heat exchange device comprises:

A second inlet for permeate boil-off gas;

the pervaporation gas second outlet is communicated with the pervaporation gas second inlet to form a pervaporation gas second pipeline, and the pervaporation gas second outlet is communicated with the pervaporation gas first inlet through a pipeline;

the fourth refrigerant inlet is communicated with the drying equipment through a pipeline, and the fourth valve and the second expansion valve are arranged on the pipeline;

a refrigerant fourth outlet communicated with the refrigerant fourth inlet to form a refrigerant fourth pipeline, and the refrigerant fourth outlet is communicated with the vapor-liquid separation device through a pipeline;

The pervaporation gas second pipe is not communicated with the refrigerant fourth pipe.

preferably, the method further comprises the following steps:

and the high-low pressure liquid storage equipment is communicated with the heat dissipation equipment and the drying equipment through pipelines respectively.

preferably, the method further comprises the following steps:

and the evaporation pressure regulating valve is arranged on a pipeline for communicating the second heat exchange equipment with the vapor-liquid separation equipment.

Preferably, the evaporation pressure regulating valve is arranged on a pipeline for communicating the fourth refrigerant outlet of the second heat exchange device with the vapor-liquid separation device.

Preferably, the method further comprises the following steps:

the first temperature sensor is arranged on the first heat exchange equipment;

the second temperature sensor is arranged on the second heat exchange equipment;

a third temperature sensor disposed at the waste heat recovery device;

A fourth temperature sensor disposed at the heat sink.

Preferably, said first temperature sensor is disposed at said permeate boil-off gas first outlet of said first heat exchange means.

preferably, said second temperature sensor is disposed at said permeate boil-off gas second outlet of said second heat exchange means.

Preferably, the third temperature sensor is arranged at the feeding inlet of the waste heat recovery device.

Preferably, the fourth temperature sensor is disposed at the refrigerant second inlet of the heat sink.

Preferably, the method further comprises the following steps:

and the sight glass equipment is arranged on a pipeline communicated with the drying equipment and the first heat exchange equipment and the second heat exchange equipment respectively.

preferably, the method further comprises the following steps:

a fan disposed at the heat sink.

A condensation method applied to the condensation system as described above, comprising the steps of:

Step S1, under the action of permeation vaporization gas, the first heat exchange device and the second heat exchange device vaporize refrigerants to obtain a first refrigerant, and the first refrigerant is conveyed to the vapor-liquid separation device through a pipeline;

step S2, the vapor-liquid separation device performs vapor-liquid separation on the first refrigerant to obtain a second refrigerant, and the second refrigerant is sent to the compression device through a pipeline;

step S3, the compression device compresses the second refrigerant to obtain a third refrigerant, and the third refrigerant is sent to the heat dissipation device and the waste heat recovery device through a pipeline;

Step S4, after the third refrigerant is processed by the combination of the heat dissipation device and the waste heat recovery device, obtaining a fourth refrigerant, and the fourth refrigerant is conveyed to the drying device through a pipeline;

step S5, after the drying device performs drying processing on the fourth refrigerant, the refrigerant is obtained, and the refrigerant is sent to the first heat exchange device and the second heat exchange device through a pipeline.

preferably, in step S1, the method includes the following steps:

Step S110, opening the third valve and the fourth valve, wherein the refrigerant passes through the first expansion valve and the second expansion valve and then enters the first heat exchange device and the second heat exchange device, and the permeated vaporized 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 gasification gas outlet of the first heat exchange device through a first temperature sensor, and detecting a second temperature of the pervaporation gas at a second gasification gas outlet of the second heat exchange device through 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 higher 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 higher than the second preset value, the fourth valve is opened, and if the second temperature is equal to the second preset value, the fourth valve is closed;

and if the first temperature and the second temperature are respectively equal to the first preset value and the second preset value at the same time, closing the third valve, the fourth valve and the compression equipment.

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 enable the temperature of the refrigerant entering the first heat exchange device to be lower than the temperature of the refrigerant entering the second heat exchange device;

Step S112, in the second heat exchange device, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant, and in the first heat exchange device, the refrigerant exchanges heat with the pervaporation gas to obtain the first refrigerant;

Step S113, the pressure of the first refrigerant output by the second heat exchange equipment is adjusted through an evaporation pressure adjusting valve, and the first refrigerant output by the second heat exchange equipment and the first refrigerant output by the first heat exchange equipment are mixed and then are conveyed to the vapor-liquid separation equipment through a pipeline.

preferably, in step S4, the method includes the following steps:

s410, feeding the feed of the pervaporation system into the waste heat recovery equipment, and feeding air into the heat dissipation equipment;

Step S420, detecting a third temperature of the feeding material through 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, and enabling the third refrigerant to sequentially enter the waste heat recovery device and the heat dissipation device, 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 through a pipeline;

If the third temperature is higher than the third preset value, opening the second valve, closing the first valve, and allowing the third refrigerant to enter the heat dissipation equipment;

Step S440 of detecting a fourth temperature of the third refrigerant at a second refrigerant inlet of the heat sink through 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, a fan of the heat dissipation device is started, the third refrigerant and the air are subjected to heat exchange to obtain a fourth refrigerant, and the fourth refrigerant is conveyed to the drying device through a pipeline;

if the fourth temperature is lower than the fourth preset value, the fan of the heat dissipation 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 step S4, the fourth refrigerant is delivered to a high-low pressure liquid storage device through a pipeline, and the high-low pressure liquid storage device delivers the fourth refrigerant to the drying device through a pipeline.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

according to the condensing system and the condensing method, waste heat is recovered, the waste heat of the high-temperature and high-pressure gas compressed by the compression equipment is effectively utilized, and the power consumption of the heat dissipation equipment is reduced; carrying out fractional condensation on the permeation vaporized gas; the infiltration vaporized gas directly carries out the heat transfer condensation with the refrigerant, compares with the current indirect heat transfer condensation that carries on of water or other solvents, can save equipment investment, operation energy consumption and area.

drawings

FIG. 1 is a schematic diagram of an exemplary embodiment of the present invention.

wherein the reference numerals are: the system comprises a compression device 1, a first valve 2, a second valve 3, a waste heat recovery device 4, a heat dissipation device 5, a fan 6, a high-low pressure liquid storage device 7, a drying device 8, a sight glass device 9, a third valve 10, a first expansion valve 11, a first temperature sensor 12, a first heat exchange device 13, a fourth valve 14, a second expansion valve 15, a second temperature sensor 16, a second heat exchange device 17, an evaporation pressure adjusting valve 18, a vapor-liquid separation device 19, a third temperature sensor 20 and a fourth temperature sensor 21.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

the invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.