Bag type dust collector for gas of steelmaking converter

Abstract

The utility model 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 obviously reduced, the explosion-proof capability of equipment is improved, 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 realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of steel converter gas bag type dust collector, for the dust removal of gas and flue gas in the steel industry converter steelmaking process, meet the requirements of gas recovery and flue gas emission standard. BACKGROUND

[0002] Converter is a kind of steelmaking equipment, i.e. the equipment that molten iron is poured into converter and becomes molten steel by blowing oxygen decarburization, and converter includes mainly process such as adding molten iron, blowing oxygen smelting, tapping molten steel, slagging, and so on, and it is repeated.

[0003] Converter gas is generated when blowing oxygen smelting, and needs to be recovered after dust removal;Flue gas is generated when not blowing oxygen smelting, and needs to be emitted after dust removal;That is, gas and flue gas (containing oxygen) appear alternately.

[0004] Both converter gas or flue gas need to be dusted to remove particulate matter. Traditional dust removal methods include wet scrubbing and dry electric dust removal. Wet scrubbing has low purification efficiency, causes water pollution, corrosion and other problems, and has high energy consumption.

[0005] Dry dust removal is the direction of technological development, and electric dust removal is a typical representative, but the efficiency of electric dust removal will gradually decrease, and the outlet dust concentration is high (20mg / m 3 ~50mg / m 3 Not equal), especially when electric dust removal works, electric field spark discharge, which easily leads to gas explosion, and the safety is not enough.

[0006] Bag type dust collector is a kind of high-efficiency dust removal equipment (outlet dust concentration <10mg / m 3 ), and is widely used. In the past, because the high temperature resistance of filter material (300℃~500℃) is not good enough, it is rarely used in converter gas purification. With the progress of science and technology, the problem of temperature resistance of filter material has been solved, and bag type dust collector has been implemented in some steel plants for converter gas purification, but it is just a copy of the bag type dust collector for blast furnace gas, and it is not designed for the characteristics of converter gas (gas and flue gas appear alternately). The main problems are in two aspects: first, when the converter is not blowing oxygen smelting, there is a lot of oxygen-containing flue gas in the ash bucket of bag type dust collector, and when the converter is blowing oxygen smelting, the gas enters the bag type dust collector and mixes with the flue gas in the ash bucket, which is dangerous. Vice versa;Second, the copied bag type dust collector for blast furnace gas is lower gas inlet, and all the gas flows from bottom to top in the dust collector, which is opposite to the direction of gravity settlement of dust after cleaning, so the dust is not easy to settle in the ash bucket, resulting in high filtration resistance and high energy consumption during operation of the dust collector. SUMMARY

[0007] The utility model discloses a steel converter gas bag type dust collector which is provided by taking the deficiencies of the prior art into account, and solves the problems existing in the prior art when the blast furnace gas bag type dust collector is used for converter gas purification, and realizes efficient, safe and energy-saving dry purification of converter gas.

[0008] The technical solution of the utility model is: steel converter gas bag type dust collector, including air inlet pipe, middle box, filter element, flower board, ash bucket, pulse spray dust cleaning device, clean gas chamber, manhole door, explosion vent, air outlet pipe, diffusion pipe, support, middle box and support weld, the lower part of middle box installs ash bucket, and middle box is welded with manhole door and explosion vent, and the upper part of middle box is welded with flower board, the upper part of flower board is welded with clean gas chamber, pulse spray dust cleaning device is installed in clean gas chamber, the side of clean gas chamber is welded with manhole door, and the top is welded with air outlet pipe, explosion vent and diffusion pipe, and its characterized in that the lower part side of middle box is welded with air inlet pipe, and the end of air inlet pipe is welded with four-way air distributor, four-way air distributor is arranged at the center position of middle box, four-way air distributor includes four-way connector, left air outlet pipe, right air outlet pipe and conical diffuser, the air inlet end of four-way connector of four-way air distributor is horizontally welded with air inlet pipe, and the left and right two air outlet ends are respectively symmetrically welded with left air outlet pipe and right air outlet pipe, and the lower part is welded with conical diffuser, the middle box is cylindrical, the corresponding flower board is circular, the side wall of middle box is arc chord passage, the left and right sides of corresponding flower board are arc chord area, and the middle is filter area, and the filter element is installed on the flower board hole in filter area.

[0009] According to the utility model embodiments, the conical diffuser is inserted into the ash bucket, and the left air outlet pipe and the right air outlet pipe are respectively inserted into the arc chord passages of the side walls of the middle box.

[0010] According to the utility model embodiments, the bottom of the conical diffuser is open, and the conical diffuser is a louver type or a perforated plate type.

[0011] According to the utility model embodiments, 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 the utility model embodiments, the explosion valve is a diaphragm type, a weight type, a spring type or a combination type.

[0013] According to the utility model embodiments, the pulse spray dust cleaning device is a pulse spray dust cleaning type with compressed nitrogen as the gas source.

[0014] According to the utility model embodiments, the clean gas chamber is circular, and the upper part of the circular shape is provided with a head.

[0015] The technical features of the utility model are that after the gas enters the bag type dust catcher through the air inlet pipe, the gas is divided into three parts through the four-way air distributor, one part of the airflow flows downward through the conical flow distributor and diffuses to the periphery in a radial manner to drive the remaining gas in the ash bucket, and finally flows to the filtering element from bottom to top; the other two parts of the airflow are distributed through the air outlet pipe and flow to the left and right respectively, and then flow along the side wall of the middle box body (the arc chord passage) from bottom to top and gradually flow to the filtering element from the side.

[0016] The technical features of the utility model are that the filtering element is not arranged in the arc chord area on the left and right sides of the flower plate, and the purpose is to design the space below the arc chord area of the flower plate as an airflow upward passage to reduce the airflow upward speed in the dust catcher, which is beneficial to dust settlement.

[0017] The working principle of the device is as follows: after the converter gas enters the bag type dust catcher through the air inlet pipe, the gas is divided into three parts through the four-way air distributor, one part of the gas flows downward through the conical flow distributor, diffuses to the periphery in a radial manner to drive the remaining flue gas in the ash bucket, and then passes through the bottom of the filtering element to be filtered, the other two parts of the gas flow to the left and right respectively through the distribution of the left air outlet pipe and the right air outlet pipe, and then flow along the side wall of the middle box body (the arc chord passage) from bottom to top and gradually flow to the filtering element from the side for filtration, the purified gas is discharged from the inside of the filtering element and collected in the clean gas chamber, and finally discharged from the top air outlet pipe to complete the gas purification. Conversely, when the flue gas is purified, the working process is the same, except that the initial driving is the gas in the ash bucket. When the dust on the surface of the filtering element accumulates to a certain thickness, the control system sends a command, and the pulse jet dust cleaning device starts to work to clean the dust cake on the surface of the filtering element. The cleaned dust is stored in the ash bucket, and finally discharged from the ash discharge port of the ash bucket when the storage amount reaches a certain amount.

[0018] When the filtering element and the pulse jet dust cleaning device are installed or replaced, the side manhole door can be opened, and the operator can operate on the flower plate. Before maintenance, open the clean gas chamber top diffuser valve to discharge the gas in the dust catcher.

[0019] The beneficial effects of the utility model are as follows: compared with the existing converter gas dry dust collector, the device can significantly reduce the contact probability of the gas and the flue gas, improve the explosion-proof capacity of the equipment, reduce the airflow upward speed, which is beneficial to dust settlement, reduce the operating resistance and energy consumption, and realize efficient, safe and energy-saving operation of the converter gas bag type dust catcher. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The utility model discloses a converter gas bag type dust catcher for steelmaking.

[0021] Figure 2 The utility model discloses a converter gas bag type dust catcher for steelmaking. Figure 1A-A view of Figure 1.

[0022] Figure 3 A plan view of the bag-type dust collector for converter gas in steelmaking, Figure 1 B-B view of Figure 1.

[0023] Figure 4 An external view of the four-way air distributor.

[0024] In the figure: 1 support column, 2 ash hopper, 3 middle box body, 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 vent, 7 flower plate, 8 clean gas chamber, 9 diffusion pipe, 10 air outlet pipe, 11 pulse dust cleaning device, 12 manhole door, 13 air inlet pipe. DETAILED DESCRIPTION

[0025] The utility model will be further described below.

[0026] The bag-type dust collector for converter gas in steelmaking 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 dust cleaning device 11, a clean gas chamber 8, a manhole door 12, an explosion vent 6, an air outlet pipe, a diffusion pipe 9, and a support column 1. The middle box body 3 is welded to the support column 1. The ash hopper 2 is installed at the lower part of the middle box body 3. The manhole door 12 and the explosion vent 6 are welded to the middle box body 3. The flower plate 7 is welded to the upper part of the middle box body 3. The clean gas chamber 8 is welded to the upper part of the flower plate 7. The pulse dust cleaning device 11 is installed inside and outside the clean gas chamber 8. The manhole door 12 is welded to the side of the clean gas chamber 8. The air outlet pipe 10, the explosion vent 6, and the diffusion pipe 9 are welded to the top of the clean gas chamber 8. The air inlet pipe 10 is welded to the four-way air distributor 4 at the end. The four-way air distributor 4 is arranged at the center of the middle box body 3. The four-way air distributor 4 comprises 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 end of the four-way connector 41 of the four-way air distributor 4 is horizontally welded to the air inlet pipe 10. The left air outlet pipe 42 and the right air outlet pipe 43 are symmetrically welded to the left air outlet end and the right air outlet end, respectively. The conical diffuser 44 is welded to the lower part. The middle box body 3 is cylindrical. The flower plate 7 is circular. The side wall of the middle box body 3 is an arc chord passage. The left and right sides of the flower plate 7 are arc chord areas. The middle part is a filter area. The filter element 5 is installed in the flower plate hole in the filter area.

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

Claims

1. Steelmaking converter gas bag type dust collector, comprising air inlet pipe, middle box, filter element, flower plate, ash bucket, pulse jet dust cleaning device, clean gas chamber, manhole door, explosion vent, air outlet pipe, diffusion pipe, support, the middle box is welded with the support, the lower part of the middle box is installed with the ash bucket, the middle box is welded with the manhole door and the explosion vent, the upper part of the middle box is welded with the flower plate; the upper part of the flower plate is welded with the clean gas chamber; the pulse jet dust cleaning device is installed inside and outside the clean gas chamber, the side of the clean gas chamber is welded with the manhole door, the top is welded with the air outlet pipe, the explosion vent and the diffusion pipe, characterized in that The lower side of the middle box body is welded with an air inlet pipe, and the end of the air inlet pipe is welded with a four-way air distributor, which 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 end of the four-way connector of the four-way air distributor is horizontally welded with the air inlet pipe, the left and right air outlet ends are respectively symmetrically welded with the left and right air outlet pipes, and the lower part is welded with the conical diffuser; the middle box body is cylindrical, the corresponding flower plate is circular, the side wall of the middle box body is an arc chord passage, the left and right sides of the corresponding flower plate are arc chord areas, and the middle part is a filtering area, and the filtering area is provided with a flower plate hole, and a filtering element is mounted on the flower plate hole.

2. A baghouse for cleaning converter gas as claimed in claim 1, characterized in that The conical diffuser is inserted into the ash bucket, and the left and right air outlet pipes are respectively inserted into the arc chord passages of the side walls of the middle box body.

3. A baghouse for a steelmaking converter gas according to claim 1, characterized in that The bottom of the conical diffuser is open, and the conical diffuser is a louver type or a perforated plate type.

4. A baghouse for cleaning converter gas as claimed in claim 1, characterized in that The filtering element is a metal filter bag, a metal filter cylinder, a ceramic filter cylinder or a ceramic fiber filter cylinder.

5. A baghouse for cleaning converter gas as claimed in claim 1, wherein The explosion relief valve is a diaphragm type, a weight type, a spring type or a combination type.

6. A baghouse for cleaning converter gas as claimed in claim 1, characterized in that The pulse jet dust cleaning device is in the form of pulse jet dust cleaning with compressed nitrogen as the gas source.

7. A baghouse for cleaning converter gas as claimed in claim 1, characterized in that The clean gas chamber is circular, and the upper part of the circular chamber is provided with an end cover.

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