A positive pressure gas-liquid separation and circulation integrated device

Abstract

The utility model belongs to electrochemistry gas -liquid separation device, disclose a kind of positive pressure gas-liquid separation and circulation integrated device, including gas-liquid separator, air compressor, high pressure tank, gas unit;The lateral wall of gas-liquid separator is sequentially provided with gas outlet, gas raw material inlet, gas-liquid mixing inlet from top to bottom, and the bottom end of gas-liquid separator is provided with liquid outlet;Gas outlet is communicated with the inlet of air compressor, and the outlet of air compressor is communicated with the inlet of high pressure tank, and the outlet of high pressure tank is communicated with the inlet of gas unit, and the outlet of gas unit is communicated with gas-liquid mixing inlet;Gas raw material inlet is used to connect gas supply unit, and liquid outlet is used to connect liquid product recovery tank.The utility model can improve the gas raw material utilization rate of electrochemical gas diffusion electrode, to realize the efficient use of gas raw material, reduce production cost.

Description

Technical Field

[0001] This utility model relates to an electrochemical gas-liquid separation device, specifically a gas-liquid separation and circulation device. Background Technology

[0002] Human society and agricultural production have long relied heavily on the conversion and consumption of fossil fuels for energy and essential chemical products such as nitrogen fertilizers. However, the widespread use of fossil fuels has not only accelerated resource depletion but also led to an increasingly severe energy crisis and environmental pressures. Against this backdrop, electrochemical catalytic conversion technologies, particularly electrochemical carbon dioxide reduction and electrochemical nitrogen reduction for ammonia synthesis, are gradually becoming emerging pathways for synthesizing renewable fuels and green chemical raw materials. When these electrochemical synthesis processes are coupled with renewable electricity sources such as solar and wind power, their potential and advantages in reducing carbon emissions across the entire energy system and decarbonizing chemical processes become even more pronounced.

[0003] In cathodic reactions involving gaseous reactants (such as CO2 and N2) and liquid electrolytes, the gas diffusion electrode (GDE) is a key component for achieving efficient gas-liquid-solid three-phase interface reactions. The GDE typically requires a continuous supply of excess reactant gas to maintain the hydrophobic properties of its internal pore structure, thereby ensuring a stable three-phase reaction interface and high catalytic efficiency. However, current operating strategies based on excess gas supply have significant drawbacks: a large amount of gaseous feedstock escapes through the electrode without participating in the reaction, resulting in generally low reactant utilization. This not only wastes resources but also significantly increases feedstock gas consumption and the operating costs of the gas circulation system, hindering the economic feasibility and widespread application of this technology. Utility Model Content

[0004] This invention aims to solve the technical problems of low utilization rate and high cost of gaseous raw materials in electrochemical reactions in the prior art. It provides a positive pressure gas-liquid separation and circulation integrated device, which can improve the utilization rate of gaseous raw materials in electrochemical gas diffusion electrodes, so as to achieve efficient utilization of gaseous raw materials and reduce production costs.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model provides a positive pressure gas-liquid separation and circulation integrated device, including a gas-liquid separator. The side wall of the gas-liquid separator is provided with a gas outlet, a gas raw material inlet, and a gas-liquid mixing inlet from top to bottom. The bottom end of the gas-liquid separator is provided with a liquid outlet.

[0007] The gas feed inlet of the gas-liquid separator is used to connect to the gas supply unit; the gas outlet of the gas-liquid separator is connected to the inlet of the air compressor, the outlet of the air compressor is connected to the inlet of the high-pressure tank, the outlet of the high-pressure tank is connected to the inlet of the gas-using unit, and the outlet of the gas-using unit is connected to the gas-liquid mixing inlet of the gas-liquid separator; the liquid outlet of the gas-liquid separator is used to connect to the liquid product recovery tank.

[0008] Furthermore, two mesh plates are provided between the gas feed inlet and the gas-liquid mixing inlet of the gas-liquid separator, and the two mesh plates are arranged at intervals with packing material between them.

[0009] Furthermore, the gas outlet is connected to the inlet of the air compressor via a connector.

[0010] Furthermore, the gas-liquid mixing inlet is connected to the outlet of the gas-using unit via a connecting joint.

[0011] Furthermore, the direction of the liquid outlet is vertically downward.

[0012] The beneficial effects of this utility model are:

[0013] (i) This utility model forms a closed gas circulation loop by combining the gas-liquid separator with an air compressor, a high-pressure tank, and a gas-using unit (i.e., an electrochemical reactor). The unreacted gas coming out of the gas-using unit is not discharged, but is pressurized by the air compressor and then sent back to the inlet of the gas-using unit. This realizes the recycling of gas raw materials and makes up for the weakness of low single-cycle conversion rate by increasing the number of cycles, ultimately improving the overall raw material utilization rate.

[0014] (ii) This utility model is particularly applicable to electrochemical reaction systems. Its unique adjustable design enables it to flexibly adapt to raw materials and process conditions of different properties. Specifically, by using a connecting joint, the pipe length between the gas-liquid mixing inlet and the gas raw material inlet can be conveniently increased or decreased, thereby optimizing the mixing and separation process of the gas-liquid two-phase flow and meeting the needs of various reaction scenarios.

[0015] (III) The present invention has a mesh plate structure in the cavity between the gas-liquid mixing inlet and the gas raw material inlet inside the gas-liquid separator. This not only facilitates the filling, fixing and replacement of the packing, but also effectively improves and flexibly controls the gas-liquid separation efficiency by selecting different properties or types of packing, so as to meet the specific requirements of separation effect under different application scenarios. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the positive pressure gas-liquid separation and circulation integrated device of this utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of a gas-liquid separator;

[0018] Figure 3 yes Figure 2 A magnified view of a section between the gas feed inlet and the gas-liquid mixing inlet of the gas-liquid separator.

[0019] The components are: 1. Gas-liquid separator; 2. Air compressor; 3. High-pressure tank; 4. Gas consumption unit; 5. Gas supply unit; 6. Liquid product recovery tank; 101. Gas outlet; 102. Gas raw material inlet; 103. Gas-liquid mixing inlet; 104. Liquid outlet; 105. Mesh plate; 106. Packing material. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] This embodiment provides a positive pressure gas-liquid separation and circulation integrated device that can achieve gas-liquid separation of materials, improve the utilization rate of gas raw materials, has high separation efficiency, and is simple to manufacture. It is achieved through the following technical solution:

[0022] like Figure 1 As shown, the positive pressure gas-liquid separation and circulation integrated device includes a gas-liquid separator 1, an air compressor 2, a high-pressure tank 3, and a gas-using unit 4.

[0023] The gas-liquid separator 1 is provided with a gas outlet 101, a gas feed inlet 102, a gas-liquid mixing inlet 103, and a liquid outlet 104. The gas outlet 101, gas feed inlet 102, and gas-liquid mixing inlet 103 are arranged sequentially from bottom to top on the side wall of the gas-liquid separator 1. The liquid outlet 104 is located at the bottom end of the gas-liquid separator 1. In a preferred embodiment, the liquid outlet 104 is oriented vertically downwards to facilitate the outflow of the separated liquid.

[0024] The main structure of the gas-liquid separator 1, as well as the gas outlet 101, gas raw material inlet 102, gas-liquid mixing inlet 103, and liquid outlet 104, are made of one or more of PPH, PPR, PP, and PTFE.

[0025] In a preferred embodiment, two mesh plates 105 are provided between the gas feedstock inlet 102 and the gas-liquid mixing inlet 103. The two mesh plates 105 are arranged at intervals along the axial direction of the gas-liquid separator 1, and a packing material 106 is provided between the two mesh plates 105. The mesh size of the mesh plates 105 is 2~5mm, which is used to support the packing material 6. The packing material 6 is used to enhance gas-liquid contact and droplet capture.

[0026] The gas feedstock inlet 102 of the gas-liquid separator 1 is used to connect to the gas supply unit 5, and the liquid outlet 104 of the gas-liquid separator 1 is used to connect to the liquid product recovery tank 6.

[0027] The gas outlet 101 of the gas-liquid separator 1 is connected to the inlet of the air compressor 2, the outlet of the air compressor 2 is connected to the inlet of the high-pressure tank 3, the outlet of the high-pressure tank 3 is connected to the inlet of the gas-using unit 4, and the outlet of the gas-using unit 4 is connected to the gas-liquid mixing inlet 103 of the gas-liquid separator 1.

[0028] Gas outlet 101, gas raw material inlet 102, gas-liquid mixing inlet 103, and liquid outlet 104 can be connected to other structures through welded joints. The gas-liquid separator 1 can also be formed by multi-segment welding.

[0029] In a preferred embodiment, both the gas outlet 101 and the gas-liquid mixing inlet 103 are connected to the air compressor 2 and the air-consuming unit 4 via a union connector. This allows the length of the pipe connected to the union connector to be dynamically adjusted to adapt to different gas compositions and gas volumes.

[0030] Specific applications of this utility model are as follows:

[0031] The main structure of the gas-liquid separator 1 is a vertical cylindrical container with a height-to-diameter ratio of 3:1 to 5:1. The main body is made of chemically resistant PPH (homopolymer polypropylene) pipes welded together.

[0032] The gas feedstock inlet 102 is located at the upper part of the main structure of the gas-liquid separator 1 (at 1 / 3 of the height from the top) and is used to introduce high-pressure fresh feedstock gas (such as CO2, N2, etc.).

[0033] The gas-liquid mixing inlet 103 is located on the lower side of the main structure of the gas-liquid separator 1 (at 1 / 4 of the height from the bottom) and is used to receive the mixture of unreacted gas and liquid products from the gas-using unit 4 (electrochemical reactor).

[0034] The distance between the gas feedstock inlet 102 and the gas-liquid mixing inlet 103 and other units is infinitely adjustable by means of a screw-in connector: the screw-in connector can be axially slid to extend the pipe section, with an adjustment range of 100~500mm to adapt to different gas densities and flow rate requirements.

[0035] The main structure chamber of the gas-liquid separator 1 between the gas raw material inlet 102 and the gas-liquid mixing inlet 103 is equipped with two layers of stainless steel wire (or non-metallic materials such as PP plastic) mesh plates 5. The mesh plate 5 has a mesh size of 2~5mm and is used to support the packing material 6 (such as PP Pall rings with a diameter of 10mm) to enhance gas-liquid contact and droplet capture.

[0036] Gas outlet 1 is located at the top of the main structure of gas-liquid separator 1 and is connected to the inlet of air compressor 2, which pressurizes and delivers the separated dry gas to high pressure tank 3.

[0037] The bottom of the main structure of the gas-liquid separator 1 extends vertically downward to produce a liquid outlet 4. The diameter of the liquid outlet 4 is ≥DN25, ensuring that the liquid is discharged without stagnation under the drive of gravity and positive pressure of the system.

[0038] The workflow of this utility model is as follows:

[0039] High-pressure raw material gas is introduced from the gas raw material inlet 102, forming an upward airflow barrier; the gas-liquid mixture enters the gas-liquid separator 1 through the gas-liquid mixing inlet 103, and under the action of the packing layer 106, the droplets collide with the mesh plate 105 and fall.

[0040] The separated gas is pressurized to 0.5~1.0MPa by air compressor 2 through gas outlet 1 and stored in high pressure tank 3; the gas is regulated by flow meter to flow back to gas-liquid separator 1 through gas consumption unit 4, forming a closed loop.

[0041] Liquid discharge and pressure control: Liquid products (such as formic acid, ammonia, etc.) that accumulate at the bottom are quickly discharged from the liquid outlet 104 under the positive pressure of the system (maintained by the power of the air compressor 2 and the flow of the air supply unit 5) to reduce side reactions.

[0042] Adjusting the gas input (such as CO2 flow rate) of the gas supply unit 5 can precisely control the internal pressure of the gas-liquid separator 1 (maintaining 0.2~0.8MPa) and ensure smooth liquid discharge.

[0043] The results of the above specific application examples show that the key advantages of this utility model are as follows:

[0044] (1) Adjustability: By shortening the distance between the gas raw material inlet 102 and the gas-liquid mixing inlet 103 to 100mm by using the connector, it is suitable for high-density gases (such as CO2); and extended to 500mm to adapt to low-density gases (such as H2).

[0045] (2) Separation enhancement: After filling with PP Pall rings and other fillers 106, the collection efficiency for droplets larger than 5μm is ≥98%.

[0046] (3) System compatibility: PPH material is resistant to acidic / alkaline media in electrochemical systems, and the welded connection ensures airtightness. It is suitable for various reactions such as CO2 reduction and nitrogen reduction to produce ammonia.

[0047] (4) High efficiency: It can realize the recycling of gases such as nitrogen, oxygen, air, and carbon dioxide, and improve the utilization rate of gas raw materials.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of the substantive technical content of the present utility model. The substantive technical content of the present utility model is broadly defined within the scope of the claims of the application. Any technical entity or method completed by others that is completely identical to the definition in the scope of the claims of the application, or is an equivalent modification, shall be deemed to be covered within the scope of the claims.

Claims

1. A positive pressure gas-liquid separation and circulation integrated device, characterized in that, The gas-liquid separator includes a gas outlet, a gas feedstock inlet, and a gas-liquid mixing inlet arranged sequentially from top to bottom on its sidewall, and a liquid outlet is provided at the bottom of the gas-liquid separator. The gas feed inlet of the gas-liquid separator is used to connect to the gas supply unit; the gas outlet of the gas-liquid separator is connected to the inlet of the air compressor, the outlet of the air compressor is connected to the inlet of the high-pressure tank, the outlet of the high-pressure tank is connected to the inlet of the gas-using unit, and the outlet of the gas-using unit is connected to the gas-liquid mixing inlet of the gas-liquid separator; the liquid outlet of the gas-liquid separator is used to connect to the liquid product recovery tank.

2. The positive pressure gas-liquid separation and circulation integrated device according to claim 1, characterized in that, Two mesh plates are provided between the gas feed inlet and the gas-liquid mixing inlet of the gas-liquid separator. The two mesh plates are arranged at intervals and packing is provided between the two mesh plates.

3. The integrated positive pressure gas-liquid separation and circulation device according to claim 1, characterized in that, The gas outlet is connected to the inlet of the air compressor via a yoke connector.

4. The integrated positive pressure gas-liquid separation and circulation device according to claim 1, characterized in that, The gas-liquid mixing inlet is connected to the outlet of the gas-using unit via a connecting joint.

5. The integrated positive pressure gas-liquid separation and circulation device according to claim 1, characterized in that, The liquid outlet is oriented vertically downwards.

Images