Combined type dry dust removal equipment for pressure-equalized gas at top of blast furnace

Abstract

The utility model discloses blast furnace top pressure equalizing gas combined type dry dust removal equipment which comprises a tank body, the tank body is cylindrical and is divided into a cyclone dust collector, a surge bin and a metal filter bag dust collector from bottom to top, a gas inlet is formed in the upper end of the outer side of the cyclone dust collector, and a gas outlet is formed in the lower end of the metal filter bag dust collector. An ascending pipeline is connected between the cyclone dust collector and the center of the surge bin, the depth of the ascending pipeline extends to the lower part of the cyclone dust collector, the surge bin is communicated with the metal filter bag dust collector through at least one air vent, and a coal gas outlet is formed in the top of the center of the metal filter bag dust collector. A filter bag is fixed in the metal filter bag dust remover below the coal gas outlet, and a secondary dust removal blanking pipe is arranged below the filter bag. The utility model solves the problems that a cyclone dust collector and a metal filter bag dust collector cannot be integrated, the occupied space is increased, the waste heat of coal gas is wasted and the like.

Description

Technical Field

[0001] The utility model belongs to the field of blast furnace top pressure-equalizing gas recovery, and particularly relates to a blast furnace top pressure-equalizing gas combined dry dust removal equipment. Background Art

[0002] During the blast furnace smelting process, the high-pressure gas in the tank must be released and depressurized before loading the top tank, and then the upper valve is opened for loading. This part of the released gas is usually discharged directly into the atmosphere through the top muffler. Since the gas contains a large amount of toxic, harmful, flammable and explosive gases, and a large amount of dust is accompanied by the release process, it will cause serious pollution to the atmospheric environment, especially the blast furnace area. In addition, the released gas generally contains a high moisture content. When it is released to the air through the muffler, due to the sudden decrease in pressure, the moisture in the gas is easy to condense and mix with dust to become sticky, blocking the equalizing pressure valve and the release muffler, making it unable to work normally, resulting in the blast furnace needing to be shut down for maintenance, which brings great difficulties to the production and maintenance of the blast furnace. Therefore, it is of great practical significance to recover the equalizing gas that is directly discharged into the atmosphere.

[0003] The utility model patent with publication number CN214300221U discloses a blast furnace gas pressure equalizing recovery device, including a furnace top material tank, a dust removal component, a gas storage tank, a nitrogen tank and a pressurizing device. The dust removal component includes a cyclone dust collector, a bag dust collector, a second pipeline and a dust collecting box. One end of the cyclone dust collector is connected to the first pipeline, one end of the second pipeline is connected to the cyclone dust collector, and the other end is connected to the bag dust collector. One end of the second pipeline is connected to the bag dust collector. The released gas enters the interior of the gas storage tank after preliminary purification by the cyclone dust collector and secondary purification by the furnace top bag dust collector. The valve is opened, and the nitrogen tank replenishes nitrogen for the gas storage tank. The gas in the gas storage tank is pressurized by the gas pressurizing device and the clean gas is supplied to the furnace top material tank for pressure equalization, so as to realize the closed-loop circulation of the gas. The primary dust removal ash and the secondary dust removal ash are transported to the end user through the gas. The entire switching program is incorporated into the gas pressure equalizing program and automatically controlled by a microcomputer. However, the dust removal assembly consists of two parts: a cyclone dust collector and a furnace top bag dust collector, which occupies a large area. Some small blast furnace areas do not have enough space to arrange such a dust removal system. Secondly, the steel structure uses a large amount of steel, which increases the construction cost and thus the investment cost. The connecting pipe is too long, which makes the resistance obvious, resulting in a lot of waste heat from the coal gas, which is not conducive to resource recycling. Utility Model Content

[0004] The utility model aims to provide a blast furnace top pressure-equalizing gas combined dry dust removal equipment to solve the problems of the cyclone dust collector and the metal filter bag dust collector being unable to be integrated, occupying a large space and wasting gas waste heat.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A blast furnace top pressure-equalizing gas combined dry dust removal equipment comprises a tank body, which is cylindrical and is divided into a cyclone dust collector, a buffer bin and a metal filter bag dust collector by lower, middle and upper parts. A gas inlet is arranged at the upper end of the outer side of the cyclone dust collector, and an ascending pipe is connected to the center of the cyclone dust collector and the buffer bin, and the depth of the ascending pipe extends to the lower part of the cyclone dust collector. The buffer bin and the metal filter bag dust collector are connected by at least one vent, and a gas outlet is opened at the top of the center of the metal filter bag dust collector. A filter bag is fixed in the metal filter bag dust collector below the gas outlet, and a secondary dust removal discharge pipe is arranged below the filter bag.

[0007] Preferably, the gas inlet direction of the coal gas inlet is tangential to the cyclone dust collector.

[0008] Preferably, the cyclone dust collector also includes a spiral guide plate, the top of which is connected to the gas inlet, the outer side of the spiral guide plate is welded and sealed to the inner wall of the cyclone dust collector, the inner side is welded and sealed to the rising pipe, and the bottom is connected to the cyclone dust collector.

[0009] Preferably, a conical ash bin is provided at the lower portion of the cyclone dust collector.

[0010] Preferably, the bottom surface of the buffer bin is an inverted bucket-shaped conical slope.

[0011] Preferably, a primary dust removal discharge pipe is welded to the bottom of the ash bin, and the secondary dust removal discharge pipe extends into the primary dust removal discharge pipe.

[0012] Preferably, the secondary dust removal discharge pipe is concentric with the ascending pipe, and the outer diameter is smaller than the inner diameter of the ascending pipe.

[0013] Preferably, a bell mouth is welded on the top of the secondary dust removal discharge pipe, and the bell mouth is located below the filter bag and has a diameter larger than the diameter of the filter bag.

[0014] Preferably, a cover A is installed at the bottom end of the primary dust removal discharge pipe, and a cover B is connected to the bottom end of the secondary dust removal discharge pipe.

[0015] The utility model has the following beneficial effects:

[0016] 1. The cyclone dust collector, buffer bin and metal filter bag dust collector are integrated into one, making the structure simple and compact, integrating equipment, reducing construction costs, and greatly reducing the floor space;

[0017] 2. The pipe connection length between the cyclone dust collector, buffer bin and metal filter bag dust collector is shortened, which reduces the gas flow resistance and gas waste heat loss;

[0018] 3. The integrated equipment separates smoke and dust through spiral guide plates and filter bags, and has a secondary dust removal function. It can also centrally collect and process dust through primary and secondary dust removal discharge pipes, greatly enhancing the gas dust removal and cleaning operations, and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the appearance structure of the utility model;

[0020] Figure 2 It is a schematic axial sectional view of the utility model;

[0021] Figure 3 It is a cross-sectional view of the utility model;

[0022] Figure 4 It is a schematic diagram of the positions of the cover A and the cover B of the utility model;

[0023] Icons: 1. Cyclone dust collector; 2. Buffer bin; 3. Metal filter bag dust collector; 4. Ash bin; 5. Gas inlet; 6. Rising pipe; 7. Vent; 8. Gas outlet; 9. Filter bag; 10. Secondary dust removal discharge pipe; 11. Spiral guide plate; 12. Conical slope; 13. Bell mouth; 14. Primary dust removal discharge pipe; 15. Cover A; 16. Cover B. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0025] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1-4 As shown, in this embodiment, a blast furnace top pressure-equalizing gas combined dry dust removal equipment includes a tank body, which is cylindrical and is divided into a cyclone dust collector 1, a buffer bin 2 and a metal filter bag dust collector 3 by lower, middle and upper parts. The floor space and the length of the pipeline connection are reduced by integration. A gas inlet 5 is provided at the upper end of the outer side of the cyclone dust collector 1. The cyclone dust collector 1 and the center of the buffer bin 2 are connected with an ascending pipe 6. The buffer bin 2 can increase the volume of the container to reduce the pressure change. The ascending pipe 6 is provided at the upper end of the outer side of the cyclone dust collector 1. The depth of the pipeline 6 extends to the lower part of the cyclone dust collector 1, so that the coal gas flows downward and the dust is separated by natural falling due to gravity. The buffer bin 2 is connected to the metal filter bag dust collector 3 through at least one vent 7. A coal gas outlet 8 is opened at the center top of the metal filter bag dust collector 3. A filter bag 9 is fixed in the metal filter bag dust collector 3 below the coal gas outlet 8. A secondary dust removal discharge pipe is arranged below the filter bag 9. The coal gas rises and filters the dust on the outside of the filter bag 9 through the filter bag 9, so that the coal gas is discharged purified.

[0028] Furthermore, the gas inlet 5 is tangent to the cyclone dust collector 1 in its air intake direction, so that the gas generates a swirling force when entering the cyclone dust collector 1, and the dust generates a centripetal force to separate outwards, so as to be separated from the gas.

[0029] Furthermore, the cyclone dust collector 1 also includes a spiral guide plate 11, the top of which is connected to the gas inlet 5, the outer side of the spiral guide plate 11 is welded and sealed to the inner wall of the cyclone dust collector 1, the inner side is welded and sealed to the rising pipe 6, and the bottom is connected to the cyclone dust collector 1. The spiral guide plate 11 causes the gas to flow spirally downward, increasing the spiral path of the gas so as to increase the efficiency of separating dust from the gas.

[0030] Furthermore, a conical ash bin 4 is provided at the lower portion of the cyclone dust collector 1, which can collect the dust dropped from the spiral guide plate 11.

[0031] Furthermore, the bottom surface of the buffer bin 2 is an inverted cone slope 12 to prevent dust from accumulating at the angle of the buffer bin 2 when gas enters the buffer bin 2.

[0032] Furthermore, a primary dust removal discharge pipe 14 is welded at the bottom of the ash bin 4, and the secondary dust removal discharge pipe 10 extends into the primary dust removal discharge pipe 14, so that the dust is concentrated at the bottom of the primary dust removal discharge pipe 14 and the secondary dust removal discharge pipe 10 and discharged simultaneously.

[0033] Furthermore, the secondary dust removal discharge pipe 10 is concentric with the ascending pipe 6, and the outer diameter is smaller than the inner diameter of the ascending pipe 6, so that after the coal gas passes through the spiral guide plate 11 to initially separate the dust, there is space for it to rise between the ascending pipe 6 and the secondary dust removal discharge pipe 10.

[0034] Furthermore, a bell mouth 13 is welded on the top of the secondary dust removal discharge pipe 10. The bell mouth 13 is located below the filter bag 9 and has a diameter larger than the diameter of the filter bag 9. This facilitates the collection of dust into the secondary dust removal discharge pipe 10 after the filter bag 9 performs secondary dust removal on the coal gas.

[0035] Furthermore, the bottom end of the primary dust removal discharge pipe 14 is threadedly connected with a cover A15 to facilitate dust collection, discharge and cleaning; the bottom end of the secondary dust removal discharge pipe 10 is threadedly connected with a cover B16 to prevent gas from flowing back in the secondary dust removal discharge pipe 10 and also enable dust to be collected, discharged and cleaned.

[0036] The working principle of the utility model is as follows: the coal gas generated at the furnace top is connected to the coal gas inlet 5 and enters the cyclone dust collector 1. The coal gas with dust flows downward in a spiral through the spiral guide plate 11. During this period, the dust generates centripetal force to separate outward, and falls into the ash bin 4 for centralized collection by its own gravity. The coal gas with a small amount of dust rises from the ascending pipe 6 into the buffer bin 2, reducing the change of coal gas pressure, and then rises to the metal filter bag dust collector 3 through the vent 7. The coal gas is discharged from the coal gas outlet through the filter bag 9 and enters the clean coal gas pipeline network. The dust filtered by the filter bag 9 falls into the bell mouth 13 and enters the secondary dust removal feed pipe 10. When the coal gas is introduced, the primary dust removal feed pipe 14 and the secondary dust removal feed pipe 10 are closed by the cover A and the cover B to prevent the coal gas from leaking out and to prevent the coal gas from flowing in the secondary dust removal feed pipe 10 during the flow process and causing reflux; after the coal gas is closed, the cover A and the cover B are unscrewed to discharge the collected dust.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blast furnace top pressure-equalizing gas combined dry dust removal device, comprising a tank body, the tank body is cylindrical and is divided into a cyclone dust collector (1), a buffer bin (2) and a metal filter bag dust collector (3) by lower, middle and upper parts, characterized in that: A gas inlet (5) is provided at the upper end of the outer side of the cyclone dust collector (1); an ascending pipe (6) is connected between the cyclone dust collector (1) and the center of the buffer bin (2); the depth of the ascending pipe (6) extends to the lower part of the cyclone dust collector (1); the buffer bin (2) and the metal filter bag dust collector (3) are connected through at least one vent (7); a gas outlet (8) is provided at the top center of the metal filter bag dust collector (3); a filter bag (9) is fixed in the metal filter bag dust collector (3) below the gas outlet (8); and a secondary dust removal discharge pipe (10) is provided below the filter bag (9).

2. A blast furnace top equalized pressure gas combined dry dust removal equipment according to claim 1, characterized in that: The gas inlet (5) has a gas intake direction that is tangential to the cyclone dust collector (1).

3. A blast furnace top equalizing gas combined dry dust removal equipment according to claim 2, characterized in that: The cyclone dust collector (1) further comprises a spiral guide plate (11), the top of which is connected to the coal gas inlet (5), the outer side of which is welded and sealed to the inner wall of the cyclone dust collector (1), the inner side of which is welded and sealed to the ascending pipe (6), and the bottom of which is in communication with the cyclone dust collector (1).

4. A blast furnace top equalizing gas combined dry dust removal equipment according to claim 1, characterized in that: A conical ash bin (4) is provided at the lower part of the cyclone dust collector (1).

5. A blast furnace top equalizing gas combined dry dust removal equipment according to claim 1, characterized in that: The bottom surface of the buffer bin (2) is an inverted bucket-shaped conical slope (12).

6. A blast furnace top equalizing gas combined dry dust removal equipment according to claim 4, characterized in that: A primary dust removal discharge pipe (14) is welded to the bottom of the ash bin (4), and the secondary dust removal discharge pipe (10) extends into the primary dust removal discharge pipe (14).

7. The blast furnace top equalizing gas combined dry dust removal equipment according to claim 1, characterized in that: The secondary dust removal discharge pipe (10) is concentric with the ascending pipe (6), and its outer diameter is smaller than the inner diameter of the ascending pipe (6).

8. The blast furnace top equalizing gas combined dry dust removal equipment according to claim 1, characterized in that: A bell mouth (13) is welded on the top of the secondary dust removal discharge pipe (10); the bell mouth (13) is located below the filter bag (9) and has a diameter greater than the diameter of the filter bag (9).

9. A blast furnace top equalizing gas combined dry dust removal equipment according to claim 6, characterized in that: A sealing cover A (15) is installed at the bottom end of the primary dust removal discharge pipe (14), and a sealing cover B (16) is connected to the bottom end of the secondary dust removal discharge pipe (10).

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