Bag type dust collector for gas of steelmaking converter

Abstract

The invention discloses a bag type dust collector for steelmaking converter gas. The middle box body is welded to the supporting column, the air inlet pipe is welded to the side face of the lower portion of the middle box body, the four-way air distributor is welded to the end of the air inlet pipe, the four-way air distributor is arranged in the center of the middle box body, and the four-way air distributor comprises a four-way connector, a left air outlet pipe, a right air outlet pipe and a conical air diffuser. The air inlet pipe is horizontally welded to the air inlet end of the four-way connector, the left air outlet pipe and the right air outlet pipe are symmetrically welded to the left air outlet end and the right air outlet end respectively, and the conical air diffuser is welded to the lower portion; the middle box body is cylindrical, the side wall of the middle box body is an arch-shaped arc-string channel, the left side and the right side of the corresponding pattern plate are arch-shaped arc-string areas, the middle of the corresponding pattern plate is a filtering area, pattern plate holes are formed in the filtering area, and filtering elements are installed on the pattern plate holes. According to the device, the contact probability of coal gas and flue gas can be remarkably reduced, the explosion-proof capacity of equipment is improved, meanwhile, the airflow rising speed is reduced, dust settling is facilitated, the running resistance and energy consumption are reduced, and efficient, safe and energy-saving running of the converter coal gas bag type dust collector is achieved.

Description

Technical Field

[0001] The invention relates to a steelmaking converter gas bag dust collector, which is used for dust removal of gas and smoke during converter steelmaking in the steel industry and meets the requirements of gas recovery and smoke emission up to standard. Background Art

[0002] A converter is a steelmaking equipment, which is a device that pours molten iron into the converter and decarburizes it by blowing oxygen to make it molten steel. Each time a converter makes a batch of steel, it generally includes the main processes of adding molten iron, blowing oxygen for smelting, tapping molten steel, and slag removal, which are repeated over and over again.

[0003] During oxygen-blowing smelting in the converter, coal gas is produced, which needs to be recycled after dust removal; during non-oxygen-blowing smelting, flue gas is produced, which needs to be discharged in compliance with emission standards after dust removal; that is, coal gas and flue gas (containing oxygen) appear alternately.

[0004] Whether it is converter gas or flue gas, dust removal is required to remove particulate matter. Traditional dust removal methods include wet scrubbing and dry electrostatic precipitator. Wet scrubbing has low purification efficiency and can cause water pollution, corrosion and other problems, and has high energy consumption.

[0005] Dry dust removal is the direction of technical development, and electrostatic precipitator is its typical representative. However, the efficiency of electrostatic precipitator will gradually decrease, and the outlet dust concentration is high (20mg / m 3 ~50mg / m 3 In particular, electric field spark discharge during the operation of the electrostatic precipitator can easily lead to gas explosion, which is not safe enough.

[0006] Bag filter is a high-efficiency dust removal equipment (export dust concentration <10mg / m 3 ), which is widely used. In the past, it was rarely used in converter gas purification because the filter material did not have good high temperature resistance (300℃~500℃). With the advancement of science and technology, the problem of temperature resistance of filter materials has been solved. Bag dust collectors have been implemented for converter gas purification in some steel mills, but they only copied the bag dust collectors of blast furnace gas without designing them according to the characteristics of converter gas (coal gas and flue gas appear alternately). The existing problems are mainly manifested in two aspects: First, when the converter is not smelting with oxygen, a large amount of oxygen-containing flue gas remains in the ash hopper of the bag dust collector. When the converter is smelting with oxygen, the coal gas enters the bag dust collector and mixes with the flue gas in the ash hopper, which poses a risk of explosion, and vice versa. Second, the copied blast furnace gas bag dust collector has bottom air intake, and all gases flow from bottom to top inside the dust collector, which is opposite to the direction of gravity sedimentation of dust after cleaning. Dust is not easy to settle in the ash hopper, resulting in large filtration resistance and high energy consumption when the dust collector is running. Summary of the invention

[0007] The present invention aims at providing a steelmaking converter gas bag dust collector to solve the problems existing in the existing blast furnace gas bag dust collector when used for converter gas purification, and realizes efficient, safe and energy-saving dry purification of converter gas.

[0008] The technical solution of the present invention is: a steelmaking converter gas bag dust collector comprises an air inlet pipe, a middle box, a filter element, a flower plate, an ash hopper, a pulse jet cleaning device, a clean air chamber, a manhole door, an explosion-proof door, an air outlet pipe, a venting pipe, and a support. The middle box is welded to the support, an ash hopper is installed at the lower part of the middle box, a manhole door and an explosion-proof door are welded on the middle box, and a flower plate is welded on the upper part of the middle box; a clean air chamber is welded on the upper part of the flower plate; a pulse jet cleaning device is installed inside and outside the clean air chamber, a manhole door is welded on the side of the clean air chamber, and an air outlet pipe, an explosion-proof door, and a venting pipe are welded on the top. The feature of the invention is that the air inlet pipe is welded on the lower side of the middle box, A four-way air distributor is welded to the end of the air inlet pipe, and the four-way air distributor is arranged at the center of the middle box body, and the four-way air distributor comprises a four-way connector, a left air outlet pipe, a right air outlet pipe, and a conical diffuser; the air inlet pipe is horizontally welded to the air inlet end of the four-way connector of the four-way air distributor, and the left air outlet pipe and the right air outlet pipe are symmetrically welded to the left and right air outlet ends respectively, and a conical diffuser is welded at the bottom; the middle box body is cylindrical, and the corresponding flower plate is circular, the side wall of the middle box body is a bow-shaped arc chord channel, the left and right sides of the corresponding flower plate are bow-shaped arc chord areas, and the middle is a filtering area, and flower plate holes are provided in the filtering area, and filter elements are installed on the flower plate holes.

[0009] According to an embodiment of the present invention, the conical diffuser is inserted into the ash hopper, and the left air outlet pipe and the right air outlet pipe are respectively inserted into the arcuate chord channel of the side wall of the middle box body.

[0010] According to an embodiment of the present invention, the bottom of the conical diffuser is open, and the conical diffuser is of a louver type or a porous plate type.

[0011] According to an embodiment of the present invention, the filter element is a metal filter bag, a metal filter cartridge, a ceramic filter cartridge or a ceramic fiber filter cartridge.

[0012] According to an embodiment of the present invention, the explosion relief valve is of diaphragm type, weight type, spring type or a combination thereof.

[0013] According to an embodiment of the present invention, the pulse jet cleaning device is a pulse jet cleaning form using compressed nitrogen as a gas source.

[0014] According to an embodiment of the present invention, the clean air chamber is circular, and a sealing head is provided on the upper part of the circle.

[0015] The technical feature of the present invention is that after the gas enters the bag dust collector through the air inlet pipe, it is divided into three parts through the four-way air distributor. One part of the air flow flows downward through the conical diffuser and diffuses radially to the surrounding area to drive the retained gas in the ash hopper, and finally flows from bottom to top to the filter element; the other two parts of the air flow are distributed through the air outlet pipe, flow in the left and right directions respectively, and then flow from bottom to top along the side wall of the middle box body and the arched arc chord channel, and gradually flow from the side to the filter element.

[0016] The technical feature of the present invention is that no filter elements are arranged in the arched chord areas on the left and right sides of the flower plate. The purpose is to design the lower space of the arched chord area of ​​the flower plate as an air flow rising channel to reduce the rising speed of the air flow in the dust collector, which is beneficial to dust sedimentation.

[0017] The working principle of the device of the present invention is: after the converter gas enters the bag filter from the air inlet pipe, it is divided into three parts through the four-way air distributor. One part of the gas flows downward through the conical diffuser and diffuses radially to the surrounding to drive the remaining flue gas in the ash hopper, and then turns upward to pass through the bottom of the filter element for filtration. The other two parts of the gas flow in the left and right directions respectively through the distribution of the left and right outlet pipes, and then flow from bottom to top along the side wall of the middle box (bow-shaped arc chord channel), and gradually flow from the side to the filter element for filtration. The purified gas is discharged from the inside of the filter element and then collected in the clean air chamber, and finally discharged from the top outlet pipe to complete the gas purification. Vice versa, when switching to flue gas purification, the working process is the same, except that the gas in the ash hopper is initially driven away. When the dust on the surface of the filter element accumulates to a certain thickness, the control system issues a command and the pulse jet cleaning device starts working to clean the powder cake on the surface of the filter element. The removed dust is stored in the ash hopper. When a certain storage amount is reached, it is finally discharged from the ash discharge port of the ash hopper.

[0018] When installing or replacing filter elements and pulse jet cleaning devices, the side manhole door can be opened and people can stand on the flower plate to operate. Before maintenance, open the vent valve at the top of the clean air chamber to discharge the gas in the dust collector.

[0019] The beneficial effects of the present invention are as follows: compared with the existing converter gas dry dust collector, the device of the present invention can significantly reduce the probability of contact between gas and flue gas, improve the explosion-proof capability of the equipment, and at the same time reduce the rising speed of the airflow, which is beneficial to dust sedimentation, reduces operating resistance and energy consumption, and realizes efficient, safe and energy-saving operation of the converter gas bag dust collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Elevation view of steelmaking converter gas bag filter.

[0021] Figure 2 Plan view of steelmaking converter gas bag filter, Figure 1 AA view of the .

[0022] Figure 3 Plan view of steelmaking converter gas bag filter, Figure 1 BB view.

[0023] Figure 4 Appearance diagram of four-way air distributor.

[0024] In the figure: 1 pillar, 2 ash hopper, 3 middle box, 4 four-way air distributor, 41 four-way connector, 42 left air outlet pipe, 43 right air outlet pipe, 44 conical diffuser, 5 filter element, 6 explosion-proof door, 7 flower plate, 8 clean air chamber, 9 diffusion pipe, 10 air outlet pipe, 11 pulse cleaning device, 12 manhole door, 13 air inlet pipe. DETAILED DESCRIPTION

[0025] The present invention is further described below.

[0026] The steelmaking converter gas bag dust collector comprises an air inlet pipe 13, a middle box body 3, a filter element 5, a flower plate 7, an ash hopper 2, a pulse jet cleaning device 11, a clean air chamber 8, a manhole door 12, an explosion venting door 6, an air outlet pipe, a venting pipe 9, and a support 1. The middle box body 3 is welded to the support 1, an ash hopper 2 is installed at the lower part of the middle box body 3, a manhole door 12 and an explosion venting door 6 are welded on the middle box body 3, and a flower plate 7 is welded on the upper part of the middle box body 3; a clean air chamber 8 is welded on the upper part of the flower plate 7; a pulse jet cleaning device 11 is installed inside and outside the clean air chamber 8, a manhole door 12 is welded on the side of the clean air chamber 8, an air outlet pipe 10, an explosion venting door 6, and a venting pipe 9 are welded on the top, an air inlet pipe is welded on the lower side of the middle box body 3, and an air inlet pipe 10 is welded with a four-way air distributor 4, which is arranged at the center of the middle box body 3. The four-way air distributor 4 includes a four-way connector 41, a left air outlet pipe 42, a right air outlet pipe 43, and a conical diffuser 44; the air inlet pipe is horizontally welded to the air inlet end of the four-way connector 41 of the four-way air distributor 4, and the left air outlet pipe 42 and the right air outlet pipe 43 are symmetrically welded to the left and right air outlet ends, and a conical diffuser 44 is welded to the lower part; the middle box body 3 is cylindrical, and the corresponding flower plate 7 is circular, and the side wall of the middle box body 3 is an arched arc chord channel, the left and right sides of the corresponding flower plate 7 are arched arc chord areas, and the middle is a filtering area, and flower plate holes are provided in the filtering area, and filter elements 5 are installed on the flower plate holes.

[0027] Installation of the device: The middle box 3 is welded to the support 1, and the ash hopper 2 is installed at the bottom. The air inlet pipe 13 is welded to the lower side. The end of the air inlet pipe 13 is welded to the four-way air distributor 4 at the center of the middle box (the air inlet end of the four-way 41 of the four-way air distributor 4 is horizontally welded to the air inlet pipe 13, and the left and right air outlet ends are symmetrically welded to the left and right air outlet pipes 42 and 43, respectively, and the cone diffuser 44 is welded at the bottom.), the manhole door 12 is welded to the lower side of the middle box 3, the explosion relief door 6 is welded to the upper side, and the flower plate 7 is welded to the upper part of the middle box 3; the filter element 5 is installed on the flower plate hole, and the clean air chamber 8 is welded to the upper part of the flower plate 7; the pulse jet cleaning device 11 is installed inside and outside the clean air chamber 8, the manhole door 12 is welded to the side, and the air outlet pipe 10, the explosion relief door 6, and the diffusion pipe 9 are welded to the top. After the above installation is completed, a complete converter gas bag dust collector is formed.

Claims

1. A steelmaking converter gas bag dust collector, comprising an air inlet pipe, a middle box, a filter element, a flower plate, an ash hopper, a pulse jet cleaning device, a clean air chamber, a manhole door, an explosion venting door, an air outlet pipe, a venting pipe, and a support. The middle box is welded to the support, an ash hopper is installed at the lower part of the middle box, a manhole door and an explosion venting door are welded on the middle box, and a flower plate is welded on the upper part of the middle box; a clean air chamber is welded on the upper part of the flower plate; a pulse jet cleaning device is installed inside and outside the clean air chamber, a manhole door is welded on the side of the clean air chamber, and an air outlet pipe, an explosion venting door, and a venting pipe are welded on the top. The characteristics are: An air inlet pipe is welded to the lower side of the middle box body, and a four-way air distributor is welded to the end of the air inlet pipe, and the four-way air distributor is arranged at the center of the middle box body, and the four-way air distributor comprises a four-way connector, a left air outlet pipe, a right air outlet pipe, and a conical diffuser; the air inlet pipe is horizontally welded to the air inlet end of the four-way connector of the four-way air distributor, and the left air outlet pipe and the right air outlet pipe are symmetrically welded to the left and right air outlet ends respectively, and a conical diffuser is welded to the lower part; the middle box body is cylindrical, and the corresponding flower plate is circular, and the side wall of the middle box body is a bow-shaped arc chord channel, the left and right sides of the corresponding flower plate are bow-shaped arc chord areas, and the middle is a filtering area, and flower plate holes are provided in the filtering area, and filter elements are installed on the flower plate holes.

2. The steelmaking converter gas bag dust collector according to claim 1 is characterized in that The conical diffuser is inserted into the ash hopper, and the left air outlet pipe and the right air outlet pipe are respectively inserted into the arcuate chord channel of the side wall of the middle box body.

3. The steelmaking converter gas bag dust collector according to claim 1 is characterized in that The bottom of the conical diffuser is open, and the conical diffuser is of louver type or porous plate type.

4. The steelmaking converter gas bag dust collector according to claim 1 is characterized in that The filter element is a metal filter bag, a metal filter cartridge, a ceramic filter cartridge or a ceramic fiber filter cartridge.

5. The steelmaking converter gas bag dust collector according to claim 1 is characterized in that The explosion relief valve is of diaphragm type, weight type, spring type or a combination thereof.

6. The steelmaking converter gas bag dust collector according to claim 1 is characterized in that The pulse jet cleaning device is a pulse jet cleaning form that uses compressed nitrogen as a gas source.

7. The steelmaking converter gas bag dust collector according to claim 1 is characterized in that The clean air chamber is circular, and a sealing head is arranged on the upper part of the circle.

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