Flash tank device for removing carbon dioxide from metallurgical gas

Abstract

The utility model belongs to the technical field of gas purification, and particularly discloses a flash tank device for removing carbon dioxide from metallurgical gas, which comprises a tank shell body formed by welding an upper seal head, a middle cylinder and a lower seal head. A rich liquid inlet is formed in the upper part of the middle cylindrical barrel, and a gas-liquid separation demister, a rich liquid distributor and stainless steel filler are sequentially mounted in the middle cylindrical barrel. The pregnant solution distributor is connected to a distributor plate, and the distributor plate is welded on the inner wall of the cylinder body; the stainless steel packing is piled on a packing supporting plate, and the supporting plate is welded in the cylinder body. By optimizing gas-liquid distribution and a filler structure, the CO2 removal efficiency is improved, and the energy consumption is reduced. The device is compact in structure, simple and convenient to operate and suitable for metallurgical gas purification.

Description

Technical Field

[0001] This utility model relates to the field of coal gas purification technology, specifically to a flash tank device for removing carbon dioxide from metallurgical coal gas. Background Technology

[0002] Metallurgical enterprises, especially those using blast furnaces and non-blast furnaces, need to recycle top gas and remove CO2 from it. CO2 removal is a crucial step in gas treatment, typically involving CO2 absorption in a solution followed by desorption into a flash tank and regeneration tower to obtain pure CO2. The regenerated solution is then recycled. Traditional flash tank CO2 removal methods often suffer from low efficiency, high energy consumption, and complex equipment. Therefore, a more efficient, energy-saving, and easy-to-operate flash tank device for CO2 removal from gas is needed.

[0003] Patent CN106075946A discloses a flash tank, including a tank body, a feed pipe, a demister, a separation device, a gas outlet pipe, and a discharge pipe. The tank body is made of stainless steel; the feed pipe is located below the tank body and extends into the inner cavity of the tank, and is equipped with a valve and a nozzle. It offers good demistering effect and low exhaust gas pollution.

[0004] However, the above solution relies on nozzles for the distribution of the rich liquid, which requires additional air pressure, resulting in low efficiency and high energy consumption. Utility Model Content

[0005] The purpose of this invention is to provide a flash tank device for removing carbon dioxide from metallurgical coal gas, so as to solve the problems of low efficiency and high energy consumption of flash tanks.

[0006] To achieve the above objectives, the basic solution provided by this utility model is as follows: a flash tank device for removing carbon dioxide from metallurgical coal gas, comprising a tank shell body, which is welded together from an upper end cap, a middle cylindrical body, and a lower end cap; a rich liquid inlet is provided on one side of the upper part of the middle cylindrical body, and a gas-liquid separator demister is installed below the rich liquid inlet; a rich liquid distributor is provided below the gas-liquid separator demister, the rich liquid distributor is connected to a distributor plate, and the distributor plate is welded to the inner wall of the middle cylindrical body; stainless steel packing is provided in the middle of the middle cylindrical body, the stainless steel packing is stacked on a packing support plate, and the packing support plate is welded to the inner wall of the middle cylindrical body.

[0007] The principle and beneficial effects of this invention are as follows: The three-section welded structure ensures the tank's sealing and pressure-bearing capacity, adapting to high-pressure rich liquid input (0.8-2 MPa) and low-pressure CO2 release (0.2-0.3 MPa). After the rich liquid enters through the inlet, the sudden pressure drop promotes CO2 vaporization; the gas-liquid separator demister intercepts liquid droplets entrained in the gas, improving CO2 purity; the rich liquid distributor evenly sprays the liquid onto the packing layer, expanding the gas-liquid contact area. The stainless steel packing forms spaced channels, reducing fluid resistance and promoting continuous CO2 release.

[0008] Option 2, a preferred embodiment of the basic option, involves a liquid-rich distributor made of steel pipe with a dovetail-shaped top, vertically mounted on the distributor plate. Liquid flows out dispersedly from the dovetail-shaped opening at the top of the steel pipe, forming a fan-shaped liquid film that covers a larger cross-sectional area.

[0009] Option 3, a preferred option of the basic scheme, features through-holes evenly distributed along the circumference of the support plate. Liquid flows evenly into the lower end cap through these through-holes, preventing localized liquid accumulation or flow rate differences.

[0010] Option 4, a preferred option of the basic scheme, involves welding a circumferential skirt to the bottom of the lower end cap. The circumferential skirt is fixedly connected to the ground base plate using M30 bolts. The circumferential skirt is welded to the bottom of the tank, providing uniform support and resisting pressure fluctuations inside the tank.

[0011] Option 5, a preferred embodiment of the basic option, has an exhaust port at the center of the upper end cap, which is connected to a gas flow control valve; and a drain pipe at the center of the lower end cap, which is connected to a liquid flow control valve.

[0012] Option six, a preferred embodiment of the basic option, describes a gas-liquid separator demister composed of multiple layers of metal wire mesh. When gas carrying mist passes through the mesh, the mist collides with and adheres to the metal wires of the demister, gradually forming larger droplets that fall, thus achieving gas-liquid separation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a flash tank device for removing carbon dioxide from metallurgical coal gas according to this utility model.

[0014] Figure 2 This is a top view of a flash tank device for removing carbon dioxide from metallurgical coal gas according to this utility model;

[0015] Figure 3 yes Figure 2 Sectional view at point A in the middle. Detailed Implementation

[0016] The present invention will be further described in detail below through specific embodiments:

[0017] The reference numerals in the accompanying drawings include: upper end cap - 1, middle cylindrical body - 2, lower end cap - 3, rich liquid inlet - 4, exhaust pipe - 5, gas-liquid separator demister - 6, rich liquid distributor - 7, distributor plate - 8, stainless steel packing - 9, support plate - 10, base plate - 11, drain pipe - 12, circumferential skirt - 13, liquid flow control valve - 14, gas flow control valve - 15.

[0018] Example

[0019] like Figures 1 to 3 As shown: A flash tank device for removing carbon dioxide from metallurgical coal gas includes a tank body, which is assembled by welding from an upper end cap 1, a middle cylindrical body 2, and a lower end cap 3. A rich liquid inlet 4 is provided on one side of the upper part of the cylindrical body 2. A gas-liquid separator demister 6 is installed circumferentially on the upper part of the middle cylindrical body 2. Several rich liquid distributors 7 are provided below the rich liquid inlet 4. The rich liquid distributors 7 are connected to a distributor plate 8, which is made of steel plate with the same inner diameter as the middle cylindrical body 2. The inner side of the middle cylindrical body 2 is welded to the circumference of the distributor plate 8, and it is supported. Several holes are opened on the upper part of the distributor plate 8 for installing the rich liquid distributors 7. The rich liquid distributors 7 are made of steel pipe, with a dovetail-shaped top, and are vertically installed on the distributor plate 8. An exhaust pipe 5 is provided at the center of the upper end cap 1. The port 5 is connected to a gas flow control valve 15. A stainless steel packing 9 is installed in the middle of the central cylindrical body 2. The stainless steel packing 9 is a metal perforated plate corrugated packing. The stainless steel packing 9 is evenly stacked on the upper part of the packing support plate 10. The support plate 10 is made of steel plate and has several through holes. The circumference of the central cylindrical body 2 is welded to the inside. A drain pipe 12 is provided in the center of the lower end cap 3. The drain pipe 12 is connected to a liquid flow control valve 14. A circumferential skirt seat 13 is installed on the bottom circumference of the lower end cap 3 by welding. M30 bolts are evenly distributed on the bottom of the skirt seat 13 and fixedly installed with the ground base plate 11.

[0020] In this embodiment, the rich liquid with a pressure of 0.8-2 MPa enters the tank through the rich liquid inlet 4, and the pressure drops sharply to 0.2-0.3 MPa, causing CO2 to vaporize rapidly. Gas-liquid separation: After the gas passes through the gas-liquid separator demister 6 to remove droplets, it is discharged through the exhaust pipe; the liquid is evenly sprayed onto the packing layer through the rich liquid distributor 7. As the liquid flows through the stainless steel packing 9, it forms spaced channels, further increasing the contact area, allowing CO2 to continuously precipitate. The remaining solution flows through the through holes of the packing support plate 10 into the lower end cap 3 and is discharged through the drain pipe 12. Stable system operation is maintained by adjusting the gas flow control valve 15 and the liquid flow control valve 14.

[0021] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A flash tank apparatus for the removal of carbon dioxide from metallurgical gas, characterized in that, The utility model relates to a liquid -gas separation defoaming device for liquid -gas separation defoamer, including tank shell body, the tank shell body is welded by upper head (1), middle cylinder (2) and lower head (3), the upper portion one side of middle cylinder (2) is equipped with rich liquid inlet (4), the lower installation of rich liquid inlet (4) has gas -liquid separation defoamer (6), the lower of gas -liquid separation defoamer (6) is provided with rich liquid distributor (7), rich liquid distributor (7) is connected to distributor plate (8), and distributor plate (8) is welded on the inner wall of middle cylinder (2), the middle of middle cylinder (2) is provided with stainless steel packing (9), and stainless steel packing (9) is piled on packing support plate (10), and packing support plate (10) is welded on the inner wall of middle cylinder (2).

2. A flash tank apparatus for removing carbon dioxide from metallurgical gas according to claim 1, characterized in that Rich liquid distributor (7) is made of steel pipe, top is swallow-tailed, and is installed vertically on the distributor plate (8).

3. A flash tank apparatus for removing carbon dioxide from metallurgical gas according to claim 1, characterized in that, The support plate (10) is evenly distributed with through holes in the circumferential direction.

4. A flash tank apparatus for removing carbon dioxide from metallurgical gas according to claim 1, characterized in that, The bottom of the lower head (3) is welded with a circumferential skirt (13), which is fixedly connected with the ground base plate (11) through a bolt fastener.

5. A flash tank apparatus for removing carbon dioxide from metallurgical gas according to claim 1, characterized in that The center of the upper head (1) is provided with a gas discharge pipe (5), which is connected with a gas flow control valve (15); the center of the lower head (3) is provided with a liquid discharge pipe (12), which is connected with a liquid flow control valve (14).

6. A flash tank apparatus for removing carbon dioxide from metallurgical gas according to claim 1, characterized in that The gas-liquid separation defoamer (6) is composed of multiple layers of metal wire mesh.

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