Coarse dust removal device for blast furnace gas

Abstract

The utility model discloses a rough dust removal device for blast furnace gas. The rough dust removal device comprises an outer barrel and an inner barrel which are vertically arranged, two raw gas inlet pipes are arranged at the upper part of the outer cylinder body and are symmetrically arranged on the two sides of the outer cylinder body, and the axis directions of the raw gas inlet pipes are inclined downwards and are tangent to the circumference of the outer cylinder body; a first spiral guide plate is arranged on the inner side wall of the outer cylinder; the lower part of the outer barrel is connected with a conical dust collecting hopper; the inner cylinder is arranged in the center of the outer cylinder, the lower end of the inner cylinder is communicated with the outer cylinder, and the upper end is connected with a gas outlet pipe. The dust removal device has the characteristics of simple structure and high efficiency in dust treatment.

Description

Technical Field

[0001] The present application relates to the technical field of blast furnace gas dust removal, and in particular to a blast furnace gas rough dust removal device. Background Art

[0002] Blast furnace gas is a common industrial gas, widely used in the fields of steel, chemical industry, etc. Blast furnace gas is usually used alone and mixed with coke oven gas as fuel for hot blast stoves, heating furnaces, coke ovens, power plant boilers, etc. The blast furnace gas discharged from the top of the furnace contains 40-100g / m 3 Dust, the specific value varies according to the blast furnace powder rate, furnace top pressure and other conditions. Before using these coal gases, they must be dusted. Generally, they are first dusted by gravity and then enter the bag dust collector for secondary dust removal before the qualified coal gas can be recycled. The existing gravity dust removal can settle the large particles in the coal gas to a certain extent, but the dust content after dust removal is still relatively high, which brings great pressure to the subsequent bag dust removal.

[0003] The system disclosed in the Chinese patent application number CN201320408565.4 and titled "A Gravity Dust Removal System in a Blast Furnace System" includes a gas riser, a gravity dust collector outlet pipe, and a downcomer, which includes a main pipe and two positioning pipes. The outer diameter of the pipe is the same as the outer diameter of the gas riser and the outer diameter of the gravity dust collector outlet pipe. The positioning pipes outside the positioning pipe are located at both ends of the main pipe, and their outer diameters are smaller than the outer diameter of the main pipe. The outer surface of the connection between the positioning pipe and the main pipe is stepped; the main diameter is the same as the inner diameter of the gas riser and the inner diameter of the gravity dust collector outlet pipe. This patent can effectively avoid the phenomenon of pipeline welding penetration in the gravity dust removal system, improve the dust removal effect of the blast furnace system and the welding quality of the welding weld, but it does not involve the problems raised in this application. Utility Model Content

[0004] The purpose of the utility model is to provide a blast furnace gas rough dust removal device to solve the problems mentioned in the background technology in view of the drawbacks of the prior art.

[0005] The problem described in the utility model is solved by the following technical solutions:

[0006] A rough dust removal device for blast furnace gas comprises an outer cylinder and an inner cylinder which are arranged vertically; a raw gas inlet pipe connected to the blast furnace is arranged on the upper part of the outer cylinder, and the number of the raw gas inlet pipes is 2, which are symmetrically arranged on both sides of the outer cylinder, and their axial directions are inclined downward and tangent to the circumference of the outer cylinder; a first spiral guide plate is arranged on the inner wall of the outer cylinder; a conical ash hopper is connected to the lower part of the outer cylinder; the inner cylinder is arranged at the center of the outer cylinder, and its lower end is connected to the outer cylinder, and the upper end is connected to the gas outlet pipe.

[0007] The above-mentioned blast furnace gas rough dust removal device, the inner cylinder is a segmented cylinder structure with different tapers from bottom to top, and a first inner cone is arranged at the bottom; the inner diameter of the lower end of the first inner cone is larger than the inner diameter of the upper end, and a second spiral guide plate is arranged on the inner wall of the cone; the second inner cone is connected to the top of the first inner cone, the inner diameter of the lower end of the second inner cone is smaller than the inner diameter of the upper end, and it is an inverted cone structure; 1-2 groups of inner cones with the same structure and connection method as the first inner cone and the second inner cone are connected in sequence above the second inner cone.

[0008] The angle α between the rough dust removal device for blast furnace gas and the horizontal plane is 50-60 degrees; the second spiral guide plate has the same structure as the first spiral guide plate.

[0009] The above-mentioned rough dust removal device for blast furnace gas is provided with a diverter cone at the lower end of the first inner cone. The diverter cone is a cone with two upper and lower symmetrical bottom surfaces connected, which is connected to the lower end of the first inner cone through a cross bracket.

[0010] In the above-mentioned rough dust removal device for blast furnace gas, the angle between the side wall cone surface of the conical ash collecting hopper and the horizontal plane is 65-75 degrees, and an ash discharge valve is arranged below the ash collecting hopper.

[0011] In the above-mentioned rough dust removal device for blast furnace gas, the outer diameter of the largest part of the cross-section of the diverter cone is 3-4 times the inner diameter of the lower end of the first inner cone. Beneficial Effects

[0012] Compared with the prior art, the utility model has the following advantages: First, the axial direction of the two raw gas inlet pipes is tangent to the circumference of the outer cylinder, so that when the raw gas flows into the outer cylinder, a spiral airflow is formed along the inner wall of the outer cylinder, thereby driving the airflow of the outer cylinder to rotate, and the dust particles move around under the action of the rotating airflow. The axial direction of the raw gas inlet pipe is inclined downward, which can accelerate the downward movement of the airflow. The airflow accelerates downward while rotating, driving the dust particles to flow to the ash hopper. Second, the spiral direction of the first spiral guide plate is the same as the airflow rotation direction caused by the raw gas inlet pipe connecting to the outer cylinder, which can strengthen the rotation of the airflow and help the dust move to the inner wall of the outer cylinder under the action of centrifugal force. Third, the second spiral guide plate in the first inner cone helps the airflow to rotate when it rises along the first inner cone, thereby helping the dust to move around under the action of centrifugal force. Fourth, the double cone of the diverter cone is conducive to the airflow entering the first inner cone along the annular direction, and is also conducive to the dust sliding on the diverter cone. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2This is a schematic diagram of the structure of the rough dust removal device of the utility model;

[0016] Figure 3 It is a partial structural schematic diagram of the utility model;

[0017] Figure 4 This is a schematic diagram of the utility model diverter cone structure

[0018] The symbols in the figure represent:

[0019] 1. Outer cylinder, 2. Inner cylinder, 2-1. First inner cone, 2-2. Second inner cone, 3. Ash hopper, 4. Raw gas inlet pipe, 5. Gas outlet pipe, 6. First spiral guide plate, 7. Second spiral guide plate, 8. Diverter cone, 9. Blast furnace. DETAILED DESCRIPTION

[0020] See also Figure 1-4 The utility model comprises an outer cylinder 1 and an inner cylinder 2 arranged vertically; a raw gas inlet pipe 4 connected to a blast furnace 9 is arranged on the upper part of the outer cylinder 1, and the number of the raw gas inlet pipes 4 is 2, which are symmetrically arranged on both sides of the outer cylinder 1, and the axis direction thereof is obliquely downward and tangent to the circumference of the outer cylinder 1; a first spiral guide plate 6 is arranged on the inner wall of the outer cylinder 1; a conical ash collecting hopper 3 is connected to the lower part of the outer cylinder 1; the inner cylinder 2 is arranged at the center of the outer cylinder 1, and its lower end is connected to the outer cylinder 1, and the upper end is connected to a gas outlet pipe 5, and the gas outlet pipe 5 is connected to the subsequent fine dust collector. After the dust removal of the blast furnace gas rough dust removal device, the dust content in the gas can be greatly reduced, thereby effectively reducing the workload of the subsequent fine dust collector, and greatly reducing the maintenance of the fine dust collector and the cost of replacing the dust removal device (such as dust removal bag). The first spiral guide plate 6 is inclined downward, and the angle α between it and the horizontal plane is 50-60 degrees.

[0021] There are two raw gas inlet pipes 4, which are connected from both sides of the outer cylinder 1, and their axial direction is tangent to the circumference of the outer cylinder 1, so that when the raw gas flows into the outer cylinder 1, a spiral airflow is formed along the inner wall of the outer cylinder 1, thereby driving the airflow of the outer cylinder 1 to rotate, and the dust particles move around under the action of the rotating airflow. The axial direction of the raw gas inlet pipe 4 is inclined downward, which can accelerate the downward movement of the airflow. The airflow accelerates downward while rotating, driving the dust particles to flow to the ash hopper 3. The spiral direction of the first spiral guide plate 6 is the same as the airflow rotation direction caused by the two raw gas inlet pipes 4 connected to the outer cylinder 1.

[0022] The inner cylinder 2 is a segmented cylinder structure with different tapers from bottom to top, with a first inner cone 2-1 at the bottom; the inner diameter of the lower end of the first inner cone 2-1 is larger than the inner diameter of the upper end, and a second spiral guide plate 7 is arranged on the inner wall of the cone; the second inner cone 2-2 is connected above the first inner cone 2-1, and the inner diameter of the lower end of the second inner cone 2-2 is smaller than the inner diameter of the upper end, and is an inverted cone structure; 1-2 groups of inner cones with the same structure and connection method as the first inner cone 2-1 and the second inner cone 2-2 are connected in sequence above the second inner cone 2-2. The second spiral guide plate 7 is tilted downward, and the angle α between it and the horizontal plane is 50-60 degrees.

[0023] The structure of the inner cylinder 2 is that the first inner cone 2-1 and the second inner cone 2-2 are connected alternately. As a result of this structure, the inner diameter of the inner cylinder 2 changes repeatedly, which leads to a change in the airflow velocity, which is conducive to the deposition of dust. The advantage of the first inner cone 2-1 having a lower end inner diameter greater than the upper end inner diameter is that during the upward flow of the coal gas, the flow path becomes smaller and the flow velocity becomes larger. Under the action of the second spiral guide plate 7, the rotation is accelerated, and the centrifugal force is further used to remove dust in the coal gas; after the coal gas flows through the connection between the second inner cone 2-2 and the first inner cone 2-1, the flow path becomes larger and the flow velocity becomes smaller, which is conducive to further deposition of dust.

[0024] In order to prevent the airflow from being concentrated too quickly at the center of the first inner cone 2-1, a diverter cone 8 is provided at the lower end of the first inner cone 2-1. The diverter cone is a cone with two symmetrical bottom surfaces connected, which is connected to the lower end of the first inner cone 2-1 through a cross bracket. The outer diameter of the largest cross section of the diverter cone 8 is 3-4 times the inner diameter of the lower end of the first inner cone 2-1.

[0025] The lower cone of the diverter cone 8 is conducive to guiding the airflow into the first inner cone 2-1 in an annular direction, thereby exerting the spiral drainage effect of the second spiral guide plate 7; the upper cone of the diverter cone 8 is conducive to preventing dust from accumulating on the diverter cone 8 when dust falls, and is conducive to the dust sliding into the ash hopper 3.

[0026] In order to better concentrate the dust at the bottom of the ash collecting hopper 3 , the angle between the side wall cone surface of the conical ash collecting hopper 3 and the horizontal plane is 65-75 degrees, and an ash discharge valve is arranged below the ash collecting hopper 3 .

Claims

1. A rough dust removal device for blast furnace gas, Its characteristics are: The utility model comprises an outer cylinder (1) and an inner cylinder (2) arranged vertically; a raw gas inlet pipe (4) connected to a blast furnace (9) is arranged on the upper part of the outer cylinder (1); the number of the raw gas inlet pipes (4) is two and they are symmetrically arranged on both sides of the outer cylinder (1), and their axis directions are obliquely downward and tangent to the circumference of the outer cylinder (1); a first spiral guide plate (6) is arranged on the inner side wall of the outer cylinder (1); a conical ash collecting hopper (3) is connected to the lower part of the outer cylinder (1); the inner cylinder (2) is arranged at the center of the outer cylinder (1), the lower end of which is connected to the outer cylinder (1), and the upper end is connected to a gas outlet pipe (5).

2. The rough dust removal device for blast furnace gas according to claim 1, Its characteristics are: The inner cylinder (2) is a segmented cylinder structure with different tapers from bottom to top, with a first inner cone (2-1) being arranged at the bottom; the inner diameter of the lower end of the first inner cone (2-1) is larger than the inner diameter of the upper end, and a second spiral guide plate (7) is arranged on the inner wall of the cone; the second inner cone (2-2) is connected to the top of the first inner cone (2-1); the inner diameter of the lower end of the second inner cone (2-2) is smaller than the inner diameter of the upper end, and is an inverted cone structure; and 1 to 2 groups of inner cones having the same structure and connection method as the first inner cone (2-1) and the second inner cone (2-2) are sequentially connected to the top of the second inner cone (2-2).

3. The rough dust removal device for blast furnace gas according to claim 2, Its characteristics are: The first spiral guide plate (6) is inclined downward, and the angle α between it and the horizontal plane is 50-60 degrees; the second spiral guide plate (7) has the same structure as the first spiral guide plate (6).

4. The rough dust removal device for blast furnace gas according to claim 3, Its characteristic is that A diverter cone (8) is provided at the lower end of the first inner cone cylinder (2-1); the diverter cone is a cone with two upper and lower symmetrical bottom surfaces connected, and is connected to the lower end of the first inner cone cylinder (2-1) via a cross bracket.

5. The rough dust removal device for blast furnace gas according to claim 1, Its characteristics are: The angle θ between the conical surface of the side wall of the conical ash collecting hopper (3) and the horizontal plane is 65-75 degrees, and an ash discharge valve is arranged below the ash collecting hopper (3).

6. The rough dust removal device for blast furnace gas according to claim 4, Its characteristics are: The outer diameter of the maximum cross-section of the split cone (8) is 3 to 4 times the inner diameter of the lower end of the first inner cone cylinder (2-1).

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