Hydrocyanic acid feed gas pretreatment device

Abstract

The invention relates to the technical field of chemical production, in particular to a hydrocyanic acid raw material gas pretreatment device which comprises a tank body, the tank body is vertically arranged, and a gas conveying opening and a gas inlet are fixedly formed in the upper end and the lower end of the tank body respectively; the preheating module is fixedly installed in the tank body, and the preheating module is right opposite to a port of the air inlet; the filtering module is arranged above the preheating module, and the filtering module is sequentially provided with a first-stage filtering unit, a second-stage filtering unit and a third-stage filtering unit from bottom to top; according to the invention, the processes of preheating, filtering and pressure stabilizing and buffering can be integrated, the process flow is reduced, the required equipment is simplified, and the occupied area is reduced.

Description

Technical Field

[0001] This invention relates to the field of chemical production technology, specifically to a pretreatment device for hydrogen cyanide feed gas. Background Technology

[0002] Hydrogen cyanide (HCN) is an important chemical that is widely used in the synthesis of fine chemical intermediates due to its reactive properties. It has important applications in pharmaceuticals, metallurgy, electroplating, pesticides, dyes and other fields. It can be industrially produced by reacting ammonia, natural gas and oxygen-containing gas in the presence of a suitable catalyst in a converter at high temperature.

[0003] However, the current pretreatment of hydrogen cyanide feed gas requires multiple processes such as water washing, alkali washing, adsorption, preheating, pressure stabilization, and filtration. The lengthy process results in a large number of required equipment, a large footprint, and a corresponding increase in supporting pipelines and valves, which drives up production costs. Summary of the Invention

[0004] In view of the above-mentioned shortcomings in the existing technology, the present invention provides a hydrogen cyanide feed gas pretreatment device to solve the problem that the current pretreatment of hydrogen cyanide feed gas requires multiple processes such as water washing, alkali washing, adsorption, preheating, pressure stabilization and filtration. The lengthy process results in a large number of required equipment, a large footprint, and a corresponding increase in supporting pipelines and valves, which drives up the production cost.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A hydrogen cyanide feed gas pretreatment device includes a tank body, which is vertically arranged, with a gas inlet and a gas outlet fixedly installed at its upper and lower ends, respectively; a preheating module, which is fixedly installed inside the tank body and faces the gas inlet port; and a filtration module, which is located above the preheating module and has a primary filtration unit, a secondary filtration unit, and a tertiary filtration unit arranged sequentially from bottom to top.

[0006] In this way, when pre-treating the raw gas, the raw gas enters the tank through the inlet and comes into contact with the preheating module. The preheating module is then turned on to heat the raw gas. The preheated raw gas continues to flow upward and passes through the primary filtration unit, the secondary filtration unit, and the tertiary filtration unit in sequence. The filtration module can filter out impurities carried by the raw gas. This structure can integrate the preheating and filtration processes, reduce the number of processes, simplify the required equipment, and reduce the floor space.

[0007] Furthermore, the preheating module employs a finned heat exchanger, which improves heat transfer efficiency and preheats the incoming raw material gas.

[0008] Furthermore, the preheating module can heat the raw material gas to 50-80°C, thereby reducing the temperature difference before and after the raw material gas participates in the reaction, improving the reaction efficiency, and enhancing the stability of the reaction process.

[0009] Furthermore, the primary filtration unit uses a coarse filter, the secondary filtration unit uses a medium-efficiency filter, and the tertiary filtration unit uses a high-efficiency filter. This allows for the selection of appropriate filters based on the different components of the raw gas, thereby improving the applicability of the equipment.

[0010] Furthermore, the tank body is a pressure-stabilizing buffer tank, which can stabilize the flow rate of the raw gas and maintain stable pressure inside the tank.

[0011] Furthermore, a safety valve is fixedly installed on the top surface of the tank, which can stabilize the internal pressure of the tank in a timely manner and reduce the possibility of safety accidents. Attached Figure Description

[0012] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the hydrogen cyanide feed gas pretreatment device of the present invention; Reference numerals in the accompanying drawings: Tank 1, gas inlet 101, gas outlet 102; Preheating module 2; Filter module 3, primary filter unit 301, secondary filter unit 302, tertiary filter unit 303. Detailed Implementation

[0013] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0015] Example 1: like Figure 1 As shown, the hydrogen cyanide raw material gas pretreatment device of the present invention includes a tank 1, which is vertically arranged and is a pressure-stabilizing buffer tank. Specifically, the volume of the tank 1 is 60m³. After the raw material gas enters the tank 1, the tank 1 has sufficient gas space to buffer the fluid pressure of the raw material gas and stabilize the flow rate of the raw material gas. The upper and lower ends of the tank 1 are respectively fixedly installed with a gas outlet 101 and a gas inlet 102. A safety valve is fixedly installed on the top surface of the tank 1. Specifically, the set pressure of the safety valve is 0.2MPa.

[0016] A preheating module 2 is installed on the bottom surface inside the tank 1. The preheating module 2 is directly opposite the port of the air inlet 102. The preheating module 2 adopts a finned heat exchanger and can heat the raw material gas to 50-80°. Specifically, the gas entering the tank 1 is pressure-regulated natural gas and ammonia. After the natural gas and ammonia enter the tank 1, they directly contact the finned heat exchanger. The finned heat exchanger preheats the pressure-regulated natural gas and ammonia to 50-80°, reducing the temperature difference between the natural gas and ammonia before and after participating in the reaction.

[0017] The tank 1 is also equipped with a filter module 3, which is located above the preheating module 2. The filter module 3 is provided with a primary filter unit 301, a secondary filter unit 302 and a tertiary filter unit 303 from bottom to top. The primary filter unit 301 is a coarse filter, the secondary filter unit 302 is a medium filter and the tertiary filter unit 303 is a high-efficiency filter. Specifically, the preheated natural gas and ammonia flow upwards, and after flowing to a certain height, they come into contact with the filter module 3, passing sequentially through the primary filter unit 301, the secondary filter unit 302, and the tertiary filter unit 303. The primary filter unit 301 has a filtration level of G1-G4 and a filtration accuracy of ≥5.0μm. The secondary filter unit 302 has a filtration level of F5-F9 and a filtration accuracy of 1.0-5.0μm. The tertiary filter unit 303 has a filtration level of H12-H14 and a filtration accuracy of ≤0.3μm.

[0018] Example 2: like Figure 1 As shown, the other features of Embodiment 2 are the same as those of Embodiment 1, except that the air entering the tank 1 is compressed air. The air is already at a high temperature after being pressurized by the compressor, so there is no need for the preheating module 2 to preheat it.

[0019] When compressed air enters the tank 1, the primary filtration unit 301 uses a bag filter with a filtration accuracy ≥5.0μm, the secondary filtration unit 302 uses a bag filter with a filtration accuracy ≥1.0μm, and the tertiary filtration unit 303 uses a high-efficiency filter with a filtration accuracy ≤0.3μm.

[0020] In summary, by pre-treating the raw gas through the preheating module 2 and the filtration module 3, particulate impurities carried by the raw gas are filtered out, and the raw gas is heated to the preheating temperature, which facilitates the subsequent entry of the raw gas into the reactor to directly participate in the reaction, significantly improving the reaction efficiency and ensuring the stability of the reaction process.

[0021] The above are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, and are capable of using conventional experimental methods prior to that date. They can improve and implement the present invention based on the guidance provided in this application and their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention. These modifications and improvements should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the invention or the practicality of the patent.

Claims

1. A hydrogen cyanide feed gas pretreatment device, characterized in that, include: Tank (1), the tank (1) is arranged vertically, and the upper and lower ends of the tank (1) are respectively fixedly installed with an air inlet (101) and an air outlet (102). A preheating module (2) is fixedly installed inside the tank (1) and is directly opposite the port of the air inlet (102). The filter module (3) is located above the preheating module (2). The filter module (3) is provided with a first-level filter unit (301), a second-level filter unit (302) and a third-level filter unit (303) from bottom to top.

2. The hydrogen cyanide feed gas pretreatment device as described in claim 1, characterized in that: The preheating module (2) uses a finned heat exchanger.

3. The hydrogen cyanide feed gas pretreatment device as described in claim 2, characterized in that: The preheating module (2) can heat the raw gas to 50-80°.

4. The hydrogen cyanide feed gas pretreatment device as described in claim 3, characterized in that: The primary filtration unit (301) uses a coarse filter, the secondary filtration unit (302) uses a medium-efficiency filter, and the tertiary filtration unit (303) uses a high-efficiency filter.

5. The hydrogen cyanide feed gas pretreatment device as described in claim 1, characterized in that: The tank (1) is a pressure-stabilizing buffer tank.

6. The hydrogen cyanide feed gas pretreatment device as described in claim 1, characterized in that: A safety valve is fixedly installed on the top surface of the tank (1).

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