WO2021047414A1

WO2021047414A1 - Rotary self-defrosting condensation device

Info

Publication number: WO2021047414A1
Application number: PCT/CN2020/112722
Authority: WO
Inventors: 胡毅强
Original assignee: 轮通空调节能设备（上海）有限公司
Priority date: 2019-09-09
Filing date: 2020-08-31
Publication date: 2021-03-18

Abstract

A rotary self-defrosting condensation device, relating to the technical field of gas purification, and solving the technical problem in which existing condensation devices become frosted easily. The device comprises a case, a rotary condensation core body mounted in the case, and a rotating wheel drive motor for driving the condensation core body to rotate. A first cooling cavity and a second cooling cavity are defined at a cooling side of the case. A first treatment cavity and a second treatment cavity are defined at a treatment side of the case. Multiple vertical condensation through channels are formed on the condensation core body. The first cooling cavity communicates with the second cooling cavity by means of the condensation through channel located on the cooling side of the case. The first treatment cavity and the second treatment cavity are each divided into N mutually separated treatment regions from front to back in a forward rotation direction of the condensation core body. The treatment regions in the first treatment cavity and the second treatment cavity sequentially communicate with each other by means of the condensation through channel located on the treatment side of the case and a section connecting pipe. The device provided by the invention is for removing VOCs from organic gas.

Description

Rotary wheel type self-defrosting condensing device

Technical field

The present invention relates to gas purification technology, in particular to the technology of a rotating wheel type self-defrosting and condensing device.

Background technique

Emissions of high-concentration volatile organic gases VOCs exist in many aspects of industrial processes, such as tank farm oil and gas, refined oil loading and unloading, chemical production process emissions, and so on. Condensation method is a common method to deal with high-concentration VOCs emissions. It can not only solve the problem of VOCs pollution, but also recover a large amount of high-value organic matter, which is economical.

In the process of removing VOCs by condensation, in order to achieve sufficient removal effect, it is often necessary to cool the processing gas to a very low temperature (often lower than the melting point of some VOCs gas components in the processing gas), which will cause the surface of the condenser Frost, which prevents further heat transfer and condensation. Therefore, when the condenser is working, it must be defrosted.

The existing defrosting method is basically switched by dual condensers, using the heat of the self-processed gas or the heat of the refrigerant vapor from the compressor outlet to defrost. The entire equipment is bulky, and the system is complicated and difficult to control. , Low reliability, long defrost cycle, and can’t adapt to changes in waste gas composition, concentration, flow, etc. in the treatment gas.

Summary of the invention

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a rotary self-defrosting condensing device with small size, simple structure, high reliability, and short defrosting period.

In order to solve the above technical problems, the present invention provides a wheel-type self-defrosting condensing device, which is characterized in that it includes a chassis, and a wheel-type condensing core installed in the chassis, and used to drive the condensing core to rotate The runner drive motor;

The left part of the cabinet is the cooling side, the right part is the processing side, the cooling side of the cabinet is formed with a first cooling cavity and a second cooling cavity, and the processing side of the cabinet is formed with a first processing cavity and a second processing cavity;

The condensation core is formed with a plurality of condensation passages that pass through from top to bottom, and each condensation passage can move back and forth between the cooling side and the processing side of the case along with the rotation of the condensation core;

The first cooling cavity is provided with a cooling air inlet, the second cooling cavity is provided with a cooling air outlet, and the first cooling cavity is communicated with the second cooling cavity through a condensation channel located on the cooling side of the chassis;

The first processing chamber and the second processing chamber are divided into N mutually separated processing areas in sequence from front to back along the forward rotation direction of the condensing core;

Assuming 1≤j≤N, 1≤k≤N-1, the connection relationship between the processing areas in the first processing chamber and the second processing chamber is:

The j-th processing area from the front in the first processing chamber and the j-th processing area from the front in the second processing chamber are connected to each other through a condensation channel located on the processing side of the chassis;

The first k-th processing zone in the second processing chamber and the first k+1-th processing zone in the first processing chamber are connected to each other through an interval connecting pipe, and the pipe port of the interval connecting pipe is provided with gas and liquid Splitter;

The first processing zone from the front of the first processing chamber is provided with a processing gas inlet, and the N-th processing zone from the front of the second processing chamber is provided with a processing gas outlet.

Further, it also includes a liquid storage tank, a cooling fan, a post-cooling heat exchanger, and a process intake air pre-cooler for cooling the gas;

The low-temperature side air inlet of the after-cooling heat exchanger is connected to the processing gas outlet of the Nth processing zone from the front of the second processing chamber, and the low-temperature side air outlet of the after-cooling heat exchanger is connected to the processing gas discharge point. The high-temperature side air outlet of the cold heat exchanger is connected to the cooling air inlet of the first cooling chamber, the high-temperature side air inlet of the after-cooling heat exchanger is connected to the air outlet of the cooling fan, and the air inlet of the cooling fan is connected to the second cooling The cooling air outlet of the cavity;

The air outlet of the process intake air precooler is connected to the process gas inlet of the first processing zone from the front of the first processing chamber, and the air inlet of the process intake air precooler is connected to the process gas source;

The liquid outlet of each gas-liquid separator in the cabinet is connected to the liquid inlet of the liquid storage tank through a valve.

Further, a liquid nitrogen spray pipe for spraying liquid nitrogen into the first cooling cavity is provided on the cabinet.

Further, a pressure relief valve is provided on the connecting pipe between the air inlet of the cooling fan and the cooling air outlet of the second cooling cavity.

The wheel type self-defrosting condensing device provided by the present invention uses the condensing channel of the wheel type condensing core to move back and forth on the cooling side and the processing side to reduce the temperature of the condensing channel, and by designing multiple processing zones on the processing side, the processing The air flows up and down through the condensing channel, and during processing, the temperature of each condensing channel increases step by step, thereby avoiding the trouble of frosting and defrosting, and realizing the self-defrosting function. Its structure is simple, and its volume is small. And it has high reliability and short defrost cycle.

Description of the drawings

Fig. 1 is a schematic structural diagram of a case after a partial section of a rotary wheel-type self-defrosting and condensing device according to an embodiment of the present invention;

2 is a schematic diagram of the internal structure of the chassis in the wheel-type self-defrosting and condensing device of the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a rotary self-defrosting and condensing device according to an embodiment of the present invention.

detailed description

The following describes the embodiments of the present invention in further detail in conjunction with the description of the accompanying drawings, but this embodiment is not used to limit the present invention. Any similar structure and similar changes of the present invention should be included in the protection scope of the present invention. The comma in the middle all indicate the relationship of and, and the English letters in the present invention are case-sensitive.

As shown in Figures 1 to 2, a rotary self-defrosting condensing device provided by an embodiment of the present invention is characterized in that it includes a chassis 1 and a rotary condensing core 2 installed in the chassis, and A wheel drive motor 3 for driving the rotation of the condensation core;

The left part of the cabinet 1 is the cooling side, and the right part is the processing side. The cooling side of the cabinet is formed with a first cooling cavity 4 and a second cooling cavity 5, and the processing side of the cabinet is formed with a first processing cavity and a second processing cavity. ；

The condensation core 2 is formed with a plurality of condensation passages that pass through up and down, and each condensation passage can move back and forth between the cooling side and the processing side of the case as the condensation core rotates;

The first cooling cavity 4 is provided with a cooling air inlet, the second cooling cavity 5 is provided with a cooling air outlet, and the first cooling cavity 4 is in communication with the second cooling cavity 5 through a condensation channel located on the cooling side of the chassis;

The first processing chamber is sequentially partitioned from front to back along the forward rotation direction of the condensing core 2 into N mutually isolated processing zones 6 (N=4 in this embodiment, and the value of N in other embodiments can also be used. (2, 3, or more than 4); The second processing chamber is divided into N mutually separated processing areas 7 from front to back along the forward rotation direction of the condensation core 2;

The j-th processing zone 6 from the front in the first processing chamber and the j-th processing zone 7 from the front in the second processing chamber are connected to each other through a condensation channel located on the processing side of the chassis;

The first k-th processing area 6 in the second processing chamber and the first k+1-th processing area 7 in the first processing chamber are connected to each other through an interval connecting pipe 8, and the pipe mouth of the pipe 8 is connected in the interval Equipped with a gas-liquid separator (not shown in the figure);

The first processing zone 6 from the front of the first processing chamber is provided with a processing gas inlet, and the N-th processing zone 7 from the front of the second processing chamber is provided with a processing gas outlet.

The embodiment of the present invention is used to process high-concentration volatile organic gas VOCs, and its working principle is as follows:

The wheel drive motor drives the condensing core to rotate slowly. The low-temperature cooling air is introduced into the first cooling cavity through the cooling air inlet, and then flows through the condensation channel on the cooling side of the chassis to enter the second cooling cavity, and then is discharged from the cooling air outlet. In this process, the low-temperature cooling air will cool down the condensation channel on the cooling side of the chassis;

The cooled condensing channel is transferred to the treatment side along with the condensing core body, and passes through each treatment zone of the first treatment chamber and the second treatment chamber in sequence;

Along the forward rotation direction of the condensing core, in the order from front to back, the treatment gas (to-be-treated exhaust gas containing high concentration of VOCs) first enters the first treatment zone of the first treatment chamber through the treatment gas inlet, and then flows through the The condensing channel at the treatment zone enters the first treatment zone of the second treatment chamber, and then enters the second treatment zone of the first treatment chamber through the first section connecting pipe, and then passes through the condensing channel in sequence according to similar flow routes , The second processing zone of the second processing chamber, the second section connecting pipeline, the third processing zone of the first processing chamber, the condensation channel, the third processing zone of the second processing chamber, and the third section connecting pipeline , The fourth treatment zone of the first treatment chamber, the condensation channel, the fourth treatment zone of the second treatment chamber, and finally discharge from the treatment gas outlet of the fourth treatment zone of the second treatment chamber; during this flow process, condensation The rotation direction of the core body is opposite to the flow direction of the processing gas, forming a counter-current arrangement. The gas-liquid separation function of the gas-liquid separators connected to the pipe ports in each section can effectively filter the liquid droplets contained in the processing gas; During the flow process, due to the high concentration of VOCs in the processing gas and the low surface temperature of the condensation channel, the VOCs in the processing gas condense to form a thin liquid film of organic solvent on the surface of the condensation channel. The higher organic components begin to frost on the surface of the condensation channel, and the condensation channel will quickly transfer to the next treatment zone with a higher temperature with the condensation core, and defrost under the higher temperature processing gas to realize the self-defrosting function. ；

When the water vapor in the treatment gas begins to frost on the surface of the organic liquid film (the temperature is slightly lower than 0°C), a large amount of saturated organic VOCs will condense around the water ice, releasing a large amount of condensation heat near the water ice. Play the role of defrosting or preventing the expansion of water ice, and because the surface tension of water is much greater than most organic solvents, organic solvents will take precedence over liquid water and water ice, and wetting with the surface of the condensation channel, thereby making liquid water And water ice is not easy to expand. After the water ice is transferred to the next higher temperature treatment zone with the condensing core, it will also be defrosted under the higher temperature treatment gas to realize the self-defrosting function.

When the composition, temperature, and concentration of the incoming air of the treatment gas change, or when the temperature and concentration of the outlet air are required to change, only the temperature and air volume of the cooling gas and the speed of the condensing core need to be changed to meet the requirements for different treatment gases. Processing requirements.

In the embodiment of the present invention, the cooling capacity of the cooling gas can come from direct evaporation and gasification of liquid nitrogen, low-temperature compression refrigeration systems, or from waste cooling such as LNG vaporization.

As shown in FIG. 3, the embodiment of the present invention further includes a liquid storage tank 12, a cooling fan 14, a post-cooling heat exchanger 10, and a process intake air pre-cooler 11 for cooling the gas;

The air outlet of the process intake air precooler 11 is connected to the process gas inlet of the first processing zone 6 from the front of the first processing chamber, and the air inlet of the process air intake precooler 11 is connected to the process gas source; The processed intake air pre-cooler 11 is an existing technology, which is used to perform pre-cooling treatment on the processed gas to improve the processing efficiency of the processed gas;

The discharge port of each gas-liquid separator in the case 1 is connected to the liquid inlet of the liquid storage tank 12 through a valve 13, and the case 1 is provided with liquid nitrogen for injecting liquid nitrogen into the first cooling chamber 4 Nozzle 9; the liquid nitrogen nozzle is used to add cold to the cooling side of the chassis;

The low-temperature side air inlet of the after-cooling heat exchanger 10 is connected to the processing gas outlet of the N-th processing zone 7 from the front of the second processing chamber, and the low-temperature side air outlet of the after-cooling heat exchanger 10 is connected to the processing gas discharge Point, the high-temperature side air outlet of the after-cooling heat exchanger 10 is connected to the cooling air inlet of the first cooling chamber 4, the high-temperature side air inlet of the after-cooling heat exchanger 10 is connected to the air outlet of the cooling fan 14, and the cooling fan 14 The air inlet is connected to the cooling air outlet of the second cooling cavity 5, and a pressure relief valve 15 is provided on the connecting pipe between the air inlet of the cooling fan and the cooling air outlet of the second cooling cavity;

After the processing gas passes through the processing zones of the first processing chamber and the second processing chamber in the chassis, it absorbs a large amount of cold energy, and after it is introduced into the post-cooling heat exchanger 10, it can exchange with the cooling gas discharged from the second cooling chamber Heat, refrigerate the cooling air discharged from the second cooling cavity to make full use of energy.

Claims

A wheel-type self-defrosting and condensing device, which is characterized in that it comprises a chassis, a wheel-type condensing core body installed in the chassis, and a runner-driving motor for driving the rotation of the condensing core body;

The left part of the cabinet is the cooling side, the right part is the processing side, the cooling side of the cabinet is formed with a first cooling cavity and a second cooling cavity, and the processing side of the cabinet is formed with a first processing cavity and a second processing cavity;

The condensation core is formed with a plurality of condensation passages that pass through from top to bottom, and each condensation passage can move back and forth between the cooling side and the processing side of the case along with the rotation of the condensation core;

The first cooling cavity is provided with a cooling air inlet, the second cooling cavity is provided with a cooling air outlet, and the first cooling cavity is communicated with the second cooling cavity through a condensation channel located on the cooling side of the chassis;

The first processing chamber and the second processing chamber are divided into N mutually separated processing areas in sequence from front to back along the forward rotation direction of the condensing core;

Assuming 1≤j≤N, 1≤k≤N-1, the connection relationship between the processing areas in the first processing chamber and the second processing chamber is:

The j-th processing area from the front in the first processing chamber and the j-th processing area from the front in the second processing chamber are connected to each other through a condensation channel located on the processing side of the chassis;

The first k-th processing zone in the second processing chamber and the first k+1-th processing zone in the first processing chamber are connected to each other through an interval connecting pipe, and the pipe port of the interval connecting pipe is provided with gas and liquid Splitter;

The first processing zone from the front of the first processing chamber is provided with a processing gas inlet, and the N-th processing zone from the front of the second processing chamber is provided with a processing gas outlet.
The wheel-type self-defrosting and condensing device according to claim 1, characterized in that it further comprises a liquid storage tank, a cooling fan, a post-cooling heat exchanger, and a process intake air pre-cooler for cooling the gas;

The low-temperature side air inlet of the after-cooling heat exchanger is connected to the processing gas outlet of the Nth processing zone from the front of the second processing chamber, and the low-temperature side air outlet of the after-cooling heat exchanger is connected to the processing gas discharge point. The high-temperature side air outlet of the cold heat exchanger is connected to the cooling air inlet of the first cooling chamber, the high-temperature side air inlet of the after-cooling heat exchanger is connected to the air outlet of the cooling fan, and the air inlet of the cooling fan is connected to the second cooling The cooling air outlet of the cavity;

The air outlet of the process intake air precooler is connected to the process gas inlet of the first processing zone from the front of the first processing chamber, and the air inlet of the process intake air precooler is connected to the process gas source;

The liquid outlet of each gas-liquid separator in the cabinet is connected to the liquid inlet of the liquid storage tank through a valve.
The wheel-type self-defrosting and condensing device according to claim 1, wherein a liquid nitrogen nozzle for spraying liquid nitrogen into the first cooling chamber is provided on the cabinet.
The wheel-type self-defrosting and condensing device according to claim 2, wherein a pressure relief valve is provided on the connecting pipe between the air inlet of the cooling fan and the cooling air outlet of the second cooling cavity.