Gas pipeline cyclone mist catcher

Abstract

The cyclone mist catcher comprises a gas pipe inlet 1, a gas pipe outlet 3 and a mist supplementing device body, the fog supplementing device body comprises an upper connecting flange 5, a cylinder body 2 and a lower connecting flange 7; an upper connecting flange 5 is arranged at the upper end of the cylinder 2, and a lower connecting flange 7 is arranged at the lower end; a lower flange 4 is arranged at the lower end of the gas pipe inlet; the lower flange 4 is in bolted connection with the upper connecting flange 5; a bias flow blade 8 is arranged at the position, close to the upper connecting flange 5, in the cylinder body 2; a guide cylinder 9 is arranged at the lower end in the cylinder 2; a flow guide groove 13 is formed between the flow guide cylinder 9 and the cylinder body 2; a liquid outlet 10 communicated with the flow guide groove 13 is formed in the lower end of the cylinder body 2; and an upper flange 6 is arranged at the upper end of the gas pipe outlet 3 and is in bolted connection with the lower connecting flange 7. When gas flow passes through the pipeline at the top of the desulfurizing tower, the gas flow enters the mist catcher at the descending section to form a downward rotating state. Desulfurization liquid fog drops entrained in the mist catcher are thrown to the outer wall of the mist catcher due to different densities so as to be separated from coal gas flow. And the separated desulfurization liquid flows into the guide cylinder along the inner wall of the mist catcher, and automatically flows into a desulfurization section liquid seal tank through a liquid outlet.

Description

Technical Field

[0001] The utility model relates to the fields of gas-liquid separation and gas demisting, and particularly relates to a cyclone mist catcher for a gas pipeline. Background Art

[0002] A mist catcher, also known as a demister or a gas-liquid separator, is mainly used to remove the mist droplets or liquid droplets entrained in a gas, so as to improve the purity of the gas and the subsequent treatment effect. In a coking plant, a mist catcher is often used in devices such as a desulfurization tower. At this time, the gas flow of the coal gas still entrains some small-particle-size desulfurization liquid, which will affect the absorption of ammonia in the coal gas when it enters the ammonium sulfate section, resulting in an increase in the hydrogen sulfide content in the coal gas. The general treatment method is to set a gas water seal tank in front of the saturator in the ammonium sulfate section to remove the mist droplets entrained in the coal gas, separate some of the entrained desulfurization liquid, reduce the mist droplet entrainment in the coal gas, and improve the quality of the coal gas. However, the effect is not good. Moreover, with the increase of the equipment operation time, the entrained mist droplets will accumulate and increase, and the condensed liquid cannot be removed in time, and will be entrained and absorbed by the coal gas again, resulting in an increase in the hydrogen sulfide content in the coal gas. Summary of the Invention

[0003] To solve the problems mentioned above that a gas water seal tank is set in front of the saturator in the ammonium sulfate section to remove the mist droplets entrained in the coal gas, separate some of the entrained desulfurization liquid, reduce the mist droplet entrainment in the coal gas, and improve the quality of the coal gas, but the effect is not good. With the increase of the equipment operation time, the entrained mist droplets accumulate and increase, and the condensed liquid cannot be removed in time, and will be entrained and absorbed by the coal gas again, resulting in an increase in the hydrogen sulfide content in the coal gas. The present utility model provides a cyclone mist catcher for a gas pipeline, which is characterized in that: it includes a coal gas pipe inlet, a coal gas pipe outlet, and a mist catcher body; the mist catcher body includes: an upper connecting flange, a cylinder body, and a lower connecting flange; the upper connecting flange is arranged at the upper end of the cylinder body, and the lower connecting flange is arranged at the lower end of the cylinder body; a lower flange is arranged at the lower end of the coal gas pipe inlet; the lower flange is bolted to the upper connecting flange; a deflector vane is arranged inside the cylinder body near the upper connecting flange; a draft tube is arranged at the lower end inside the cylinder body; a flow guiding groove is formed between the draft tube and the cylinder body; a drain port communicating with the flow guiding groove is arranged at the lower end of the cylinder body; an upper flange is arranged at the upper end of the coal gas pipe outlet, and the upper flange is bolted to the lower connecting flange.

[0004] The diameter of the cylinder body is larger than the diameters of the coal gas pipe inlet and the coal gas pipe outlet. The diameter of the draft tube is equal to the diameters of the coal gas pipe inlet and the coal gas pipe outlet, ensuring sufficient flow area.

[0005] An upper inspection hole communicating with the inside of the cylinder body is arranged on the side wall at the upper end of the cylinder body.

[0006] A lower inspection hole connected to the inside of the cylinder body is arranged on the side wall at the lower end of the cylinder body.

[0007] The mist catcher body is made of 304 stainless steel, which enhances the corrosion resistance of the equipment.

[0008] The beneficial effects of the present utility model are as follows: When the coal gas flow passes through the pipeline at the top of the desulfurization tower and enters the mist catcher in the descending section, the guide vanes of the mist supplementer are utilized to separate the coal gas and the mist droplets, improving the quality of the coal gas. When the separated mist droplets hit the inner wall of the mist catcher, they will condense into a liquid state and flow along the inner wall to the lower part of the mist catcher. A guide cylinder is arranged at the lower part of the mist catcher, and a diversion groove is formed inside the mist catcher. After the liquid flows into the diversion groove, it will flow by gravity to the liquid seal tank in the desulfurization section through the liquid discharge port. This solves the problem that a gas water seal tank is set in front of the saturator in the ammonium sulfate section to remove the mist droplets mixed in the coal gas, but the separation effect is not good, and the condensed liquid cannot be discharged in time and is carried away and absorbed by the coal gas again, resulting in an increase in the hydrogen sulfide content in the coal gas repeatedly. The mist catcher body is made of 304 stainless steel, enhancing the overall corrosion resistance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is the overall structural schematic diagram of the present utility model;

[0010] Figure 2 is the top view of the present utility model; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings: A cyclone mist catcher for a gas pipeline, characterized in that it includes a gas pipeline inlet 1, a gas pipeline outlet 3, and a mist catcher body; the mist catcher body includes: an upper connecting flange 5, a cylinder body 2, and a lower connecting flange 7; the upper connecting flange 5 is arranged at the upper end of the cylinder body 2, and the lower connecting flange 7 is arranged at the lower end of the cylinder body 2; a lower flange 4 is provided at the lower end of the gas pipeline inlet; the lower flange 4 is bolted to the upper connecting flange 5, and a sealing strip is clamped between the lower flange 4 and the upper connecting flange 5, which can improve the sealing performance of the flange connection; a deflector vane 8 is arranged inside the cylinder body 2 near the upper connecting flange 5. When the coal gas passes through the pipeline at the top of the desulfurization tower and enters the mist catcher in the descending section, the deflector vane 8 will cause the coal gas to form a rotating force that moves downward and disperses to both sides. Due to the different densities, the desulfurization mist droplets entrained in the coal gas will be thrown onto the inner wall of the cylinder body 2 and thus separated from the coal gas flow; a guide cylinder 9 is arranged at the lower end inside the cylinder body 2; a diversion groove 13 is formed between the guide cylinder 9 and the cylinder body 2; a liquid discharge port 10 communicating with the diversion groove 13 is provided at the lower end of the cylinder body 2. The mist droplets separated by the mist catcher will condense and flow along the inner wall of the cylinder body 2 to the diversion groove 13, and then flow by gravity to the liquid seal tank in the desulfurization section through the liquid discharge port 10; an upper flange 6 is provided at the upper end of the gas pipeline outlet 3, and the upper flange 6 is bolted to the lower connecting flange 7, and a sealing strip is clamped between the upper flange 6 and the lower connecting flange 7, which can improve the sealing performance of the flange connection.

[0012] The diameter of the draft tube 9 is equal to the diameters of the gas inlet 1 and the gas outlet 3 of the gas pipe.

[0013] The diameter of the cylinder body 2 is larger than the diameters of the gas inlet 1 and the gas outlet 3 of the gas pipe, which ensures the flow area of the gas flow and increases the accommodation space of the diversion groove 13 formed between the cylinder body 2 and the draft tube 9.

[0014] An upper observation hole 11 communicating with the inside of the cylinder body 2 is provided on the side wall at the upper end of the cylinder body 2. Through the upper observation tube 11, maintenance personnel can more easily determine the components that need to be maintained or replaced, thereby simplifying the maintenance process and reducing the downtime.

[0015] A lower inspection hole 12 communicating with the inside of the cylinder body 2 is provided on the side wall at the lower end of the cylinder body 2. Through the lower inspection hole 12, the staff can directly observe the liquid level of the condensed liquid, and can appropriately clean the fine particles falling into the diversion groove 13 to ensure the smooth discharge between the diversion groove 13 and the liquid discharge port 10.

[0016] The working principle of the present utility model is as follows: The mist eliminator is installed between the gas inlet pipe and the gas outlet pipe of the desulfurization tower. When the gas flow passes through the pipeline at the top of the desulfurization tower, it enters the mist eliminator in the descending section. The upper layer inside the mist eliminator is provided with deflector vanes to make the gas flow form a downward rotating state. Using the principle of cyclone separation, the mist droplets entrained in the gas are separated. The desulfurization liquid mist droplets entrained therein are thrown to the outer wall of the mist eliminator due to different densities, so as to be separated from the gas flow and prevent them from being brought into the ammonium sulfate section. The pipeline mist eliminator is made of 304 stainless steel and is resistant to corrosion by desulfurization liquid. Its diameter is larger than the diameter of the gas pipeline to ensure sufficient flow area. Manholes are respectively arranged at the upper and lower parts of the cylinder body for maintenance use. A draft tube is arranged at the lower part of the cylinder body, and a diversion groove is formed between the draft tube and the cylinder body. The condensed mist droplets enter the diversion groove to prevent the desulfurization liquid from being carried out by the gas flow. The diversion groove communicates with the liquid discharge pipe orifice, and a pipeline can be connected to discharge the separated desulfurization liquid into the liquid seal tank of the desulfurization section.

Claims

1. A cyclone mist eliminator for a gas pipeline, characterized in that: It includes a gas pipe inlet (1), a gas pipe outlet (3), and a mist eliminator body; the mist eliminator body includes: an upper connecting flange (5), a cylinder body (2), and a lower connecting flange (7); the upper end of the cylinder body (2) is provided with an upper connecting flange (5), and the lower end is provided with a lower connecting flange (7); the lower end of the gas pipe inlet is provided with a lower flange (4); the lower flange (4) is bolted to the upper connecting flange (5); a deflector vane (8) is provided inside the cylinder body (2) near the upper connecting flange (5); a draft tube (9) is arranged at the lower end inside the cylinder body (2); a flow guiding groove (13) is formed between the draft tube (9) and the cylinder body (2); a liquid discharge port (10) communicating with the flow guiding groove (13) is provided at the lower end of the cylinder body (2); the upper end of the gas pipe outlet (3) is provided with an upper flange (6), and the upper flange (6) is bolted to the lower connecting flange (7).

2. The cyclone mist eliminator for a gas pipeline according to claim 1, characterized in that: The diameter of the draft tube (9) is equal to the diameters of the gas pipe inlet (1) and the gas pipe outlet (3).

3. The cyclone mist eliminator for gas pipeline according to claim 1, characterized in that: The diameter of the cylinder body (2) is larger than the diameters of the gas pipe inlet (1) and the gas pipe outlet (3).

4. A cyclone mist eliminator for a gas pipeline according to claim 1, characterized in that: An upper observation hole (11) communicating with the inside of the cylinder body (2) is provided on the side wall of the upper end of the cylinder body (2).

5. A cyclone mist eliminator for a gas pipeline according to claim 4, characterized in that: A lower inspection hole (12) connected to the inside of the cylinder body (2) is provided on the side wall of the lower end of the cylinder body (2).

6. The cyclone mist eliminator for gas pipeline according to claim 1, wherein: The mist eliminator body is made of 304 stainless steel.

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