Gas-liquid separator

Abstract

The utility model discloses a gas-liquid separator, which is arranged at the upper part of each relatively independent cavity in a rectifying tower and at the front part of a gas outlet, and comprises a filtering layer and a gas outlet pipe, the conical filtering layer divides the upper part of each cavity into a separation cavity, and the gas outlet pipe is arranged in the separation cavity. The air outlet pipe comprises a cover body, a wave pipe and a straight pipe, the cover body is located in the center of the separation cavity, and the wave pipe is in a bent arc shape and is connected with the cover body and the straight pipe. The wave pipe inclines towards the cover body, and the inclination angle is not larger than 10 degrees. A baffle is arranged on the inner upper wall of the corrugated pipe and located at the front end of the inner wall groove. The gas-liquid separator is small in occupied space and good in gas-liquid separation effect.

Description

Technical Field

[0001] The utility model is applied to the field of chemical industry and relates to the distillation separation of chemical products, in particular to a gas-liquid separator used in a distillation system. Background Art

[0002] During the cooling or pressurization process of saturated gas, a part of the condensable gas components will form small droplets and flow with the gas. The gas-liquid separation methods mostly use gravity separation and centrifugal separation. Gravity separation is based on the different densities of gas and liquid, and uses the tendency of liquid and gas to separate in the gravity field to achieve gas-liquid separation. Centrifugal separation is also based on the different densities of gas and liquid. When liquid and gas are mixed and flow together, the centrifugal force on the liquid is greater than that of the gas, and the liquid has a tendency to centrifugally separate to achieve gas-liquid separation. The efficiency of centrifugal separation is higher than that of gravity separation. The volume of this device is much smaller than that of gravity separation device, and the process range of centrifugal separation is narrow. After exceeding the specified flow rate of the gas-liquid mixture, the separation efficiency will drop sharply, and the resistance is greater than that of gravity separation.

[0003] The gas-liquid separator is mainly used for separation of gas and liquid phases. Its function is to process gas containing condensate to achieve condensate recovery or gas purification. There are many types of gas-liquid separators, such as gravity sedimentation separators, baffle separators, centrifugal separators, packing separators, wire mesh separators, microporous filtration separators, etc. There are many patent applications for gas-liquid separators. CN215352722U discloses a gas-liquid separator in the process of preparing mixed aromatics by hydrogenation of benzene, which uses wire mesh gas-liquid separation. CN214809171U provides a high-efficiency gas-liquid separation device, which uses blade baffle baffle separation. CN215505940U provides a multi-stage gas-liquid separator for tetrahydrofuran distillation, and a baffle is provided between the outer wall of the inner shell and the inner wall of the tank body; the inner cavity of the inner shell is provided with a centrifugal separation device, and the multi-stage gas-liquid separator adopts baffle and centrifugal separation. CN214714536U is a gas-liquid separation device, which is first separated by a baffle and then separated by a filter. CN213506189U discloses a gas-liquid separator, which uses gravity, centrifugation and filtration to separate gas and liquid. Each gas-liquid separator has its own advantages and disadvantages. For example, the baffle gas-liquid separator has a simple structure and low manufacturing cost, and is widely used, but it also has the problems of low separation efficiency and poor effect. The separation efficiency and separation effect of the centrifugal gas-liquid separator are better than the baffle separation, but when the gas-liquid flow rate is too fast, the separated liquid is easily taken away again. When separating gas and liquid, the traditional wire mesh gas-liquid separator often causes incomplete separation due to the flow rate problem, and often gets blocked during separation, and is inconvenient to be taken out, cleaned and replaced.

[0004] The present application sets the gas-liquid separator in the distillation tower, which consists of relatively independent distillation chambers, distillation chambers and stripping chambers from top to bottom. In each chamber, liquid atomization increases the gas-liquid interface. In order to reduce the temperature drop, the gas-liquid separator is set in the distillation tower. In a small space, gas-liquid separation is achieved, and gravity separation and centrifugal separation are not suitable. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a gas-liquid separator which is arranged in a distillation tower and realizes gas-liquid separation by means of a filter layer and liquid adsorption.

[0006] The technical solution adopted by the utility model is: the gas-liquid separator is arranged at the upper part of each relatively independent chamber in the distillation tower and in front of the gas outlet, and the independent chamber includes a distillation chamber, a distillation chamber and a stripping chamber. The gas-liquid separator includes a filter layer and a gas outlet pipe. The filter layer is arranged below the gas outlet pipe to separate the upper part of the chamber into a separation chamber, and the gas outlet pipe is arranged in the separation chamber.

[0007] Preferably, the filter layer is conical, which is conducive to uniform distribution of the liquid. The filter layer is one or more layers, and the more filter layers there are, the more conducive it is to prevent the gas from short-circuiting through the filter layer.

[0008] Preferably, the gas outlet pipe includes a cover body, a wave pipe, and a straight pipe. The cover body is located at the center of the separation chamber, which is conducive to the liquid falling into the top of the filter layer, and the cover body is used to collect gas. The wave pipe is curved and connects the cover body and the straight pipe. The curved wave pipe is conducive to gas turbulence, strengthens the liquid in the groove to adsorb droplets, and is conducive to gas-liquid separation. The straight pipe is connected to other chambers through a vacuum pump.

[0009] Preferably, the wave tube is inclined toward the cover body to facilitate the outflow of the liquid in the wave tube. The angle of inclination is not greater than 10° to ensure the surface area of ​​the liquid.

[0010] Preferably, a baffle is provided on the inner upper wall of the wave tube, and the baffle is located at the front end of the inner wall groove, so as to enhance the gas turbulence in the wave tube, increase the contact opportunity between gas and liquid, and strengthen the gas-liquid separation.

[0011] The utility model has the following beneficial effects: the utility model adopts the filter layer and the corrugated pipe to separate gas and liquid, occupies little space, and the gas-liquid separation is mainly achieved by the effect of liquid adsorbing droplets, the filter layer assists the separation, and the gas-liquid separation effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the front view of the structure of Example 1;

[0013] Figure 2 yes Figure 1 AA cross-sectional view of ;

[0014] Figure 3 This is an enlarged schematic diagram of the wave tube in Example 1

[0015] Figure 4 is a schematic diagram of the structure of Example 2;

[0016] Figure 5 is a schematic diagram of the structure of the wave tube of Example 3;

[0017] In the figure: 1-distillation chamber, 2-separation chamber, 3-distillation chamber, 4-filter layer, 5-straight pipe, 6-wavy pipe, 7-hood, 8-liquid, 9-second filter layer, 10-baffle. DETAILED DESCRIPTION

[0018] The utility model is described by taking the gas-liquid separator arranged in the distillation chamber as an example, and the gas-liquid separator can also be arranged in the rectification chamber and the stripping chamber to perform gas-liquid separation.

[0019] Example 1.

[0020] The structure of the gas-liquid separator in this embodiment is as shown in the attached figure. Figure 1 and attached Figure 2 As shown, it is arranged at the upper part of the distillation chamber 3 and in front of the gas outlet. It includes a filter layer 4 and a gas outlet pipe. The filter layer 4 is conical and is arranged below the gas outlet pipe to separate the upper part of the distillation chamber 3 into a separation chamber 2. The gas outlet pipe is arranged in the separation chamber 2. The gas outlet pipe includes a cover body 7, a wave pipe 6, a straight pipe 5, etc. The cover body 7 is located in the center of the separation chamber 2 and is used to collect gas. The wave pipe 6 is a curved arc, connecting the cover body 7 and the straight pipe 5. The straight pipe 5 is used to send the gas after gas-liquid separation into the distillation chamber 1 by the vacuum pump.

[0021] The curved wave tube 6 is conducive to gas turbulence. After the droplets in the turbulent gas in the wave tube 6 come into contact with the liquid 8 in the groove at the bottom of the wave tube, the droplets are Figure 3 As shown, the wave tube 6 is absorbed into the liquid, thereby achieving gas-liquid separation. Figure 1 As shown, it is conducive to the liquid 8 to flow out from the cover body 7. The smaller the inclination angle, the larger the surface area of ​​the liquid 8, so the inclination angle should not be greater than 10° to ensure that the surface area of ​​the liquid in the groove is fully in contact with the gas. The liquid flowing out of the cover body 7 falls on the top of the conical filter layer 4 and is evenly dispersed along the filter layer. The gas containing droplets passing through the filter layer 4 from bottom to top contacts with the dispersed liquid in the filter layer 4, and the droplets are absorbed by the liquid to become liquid flow or large droplets, which fall into the distillation chamber 3 to achieve gas-liquid separation.

[0022] The bottom of the filter layer 4 is a support plate with through holes, and granules are evenly distributed on the support plate. The granules are preferably selected from materials that are not wetted by liquid. In this way, the gaps between the granules can be filled with liquid, and the gas can pass through, increasing the contact area between the gas and the liquid, thereby achieving the purpose of enhancing the gas-liquid separation effect. If granules that are wetted with liquid are selected, the liquid will block the gaps between the particles, which is not conducive to the passage of gas. The gas and liquid pass through the surrounding areas where there is no or little liquid by short circuit, and the purpose of droplet contact with liquid and adsorption of droplet gas-liquid separation will not be achieved. In addition, non-wetting granules are also conducive to the uniform distribution of liquid.

[0023] The material of the wave tube 6 is preferably selected from a material that is wetted with liquid, which is conducive to absorbing liquid droplets in the gas, hindering the flow of gas, increasing turbulence effect, promoting gas-liquid separation, and also conducive to the rapid formation of liquid 8 in the groove.

[0024] Example 2.

[0025] This embodiment adds a second filter layer 9 on the basis of embodiment 1. Figure 4 As shown, the second filter layer 9 has the same structure and material as the filter layer 4. The purpose of adding the second filter layer 9 is to reduce the local pressure difference between the separation chamber 2 and the distillation chamber 3, to prevent the gas from short-circuiting through the filter layer, so as to achieve uniform gas passage through the filter layer and strengthen the gas-liquid separation.

[0026] The filter layer can also be set to three or more layers. The more layers there are, the better the gas-liquid separation effect is, and the pressure difference is relatively gentle, but it needs to match the capacity of the vacuum pump to ensure the gas flow rate.

[0027] Example 3.

[0028] This embodiment is an improvement on the structure of the wave tube 6 in Embodiment 1. Figure 5 As shown, a baffle 10 is provided on the inner upper wall of the wave tube. The baffle 10 is preferably located at the front end of the liquid 8 in the groove of the inner wall of the wave tube. While enhancing the gas turbulence, it increases the chance of surface contact between the gas and the liquid 8, thereby enhancing the gas-liquid separation effect.

[0029] The utility model uses a filter layer and a corrugated pipe to separate gas and liquid, which occupies a small space and is suitable for smaller spaces in a distillation tower. The gas-liquid separation is mainly achieved by the effect of liquid adsorbing droplets, and the gas-liquid separation effect is good, meeting the separation requirements of the distillation tower. The filter layer particle material and the corrugated pipe material are directly related to the specific distilled liquid. Different types of liquids have different materials for wetting and non-wetting. In addition, it is also necessary to meet the performance requirements within the conditions of the distillation chamber. However, since the material is not an object of protection for the utility model and is also a choice within the scope of the prior art, this application does not provide a specific material selection.

Claims

1. A gas-liquid separator, characterized in that: The filter is arranged at the upper part of a relatively independent chamber in a distillation tower and in front of an air outlet, and comprises a filter layer and an air outlet pipe; the filter layer is arranged below the air outlet pipe and is conical in shape, separating the upper part of the chamber into a separation chamber, and the air outlet pipe is arranged in the separation chamber; the air outlet pipe comprises a cover body (7), a wave pipe (6), and a straight pipe (5); the cover body (7) is located at the center of the separation chamber, the wave pipe (6) is in the shape of a curved arc, and connects the cover body (7) and the straight pipe (5); the wave pipe (6) is inclined toward the cover body (7); and the angle of inclination is not greater than 10°.

2. A gas-liquid separator according to claim 1, characterized in that: The filter layer is one or more layers.

3. A gas-liquid separator according to claim 1, characterized in that: A baffle (10) is provided on the inner upper wall of the wave tube (6), and the baffle (10) is located at the front end of the inner wall groove.

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