Device for recovering coal gas on blast furnace foundation

Abstract

The utility model discloses a device for recovering coal gas from a blast furnace base, which comprises a blast furnace shell, a concrete base is connected below the blast furnace shell, a furnace base coal gas sealing plate and a heat-resistant base pier are sequentially arranged at the lower part of an inner cavity of the blast furnace shell from top to bottom, and a cover body is arranged at the top of the concrete base and on the outer side of the side wall of the concrete base. A gap is formed between the inner wall of the cover body and the outer wall of the concrete base; the cover body is connected with a coal gas recovery pipeline through an eduction tube, and the eduction tube is connected with an exhaust fan. The device for recovering the gas from the furnace foundation of the blast furnace, provided by the utility model, can radically solve the problem of gas leakage of the furnace foundation of the blast furnace, and can recover and reuse the leaked gas, so that the waste is reduced, and considerable value is created.

Description

Technical Field

[0001] The utility model relates to the field of blast furnace production, in particular to a device for recovering coal gas from a blast furnace foundation. Background Art

[0002] Modern blast furnaces use a gas sealing plate welded to the furnace shell to seal the gas. However, as time goes by, thermal expansion and contraction cause the weld between the gas sealing plate and the furnace shell to crack, causing gas to leak from the joint between the furnace shell and the heat-resistant concrete.

[0003] To solve the problem of gas leakage, the traditional methods include furnace foundation grouting, grooving and welding "7" plate casting, and coating with polymer sealant. However, the above methods are not only expensive, but also cannot completely solve the problem of gas leakage in the furnace foundation. In addition, the leaked gas will directly enter the atmosphere, causing waste. Utility Model Content

[0004] The utility model aims to provide a device for recovering coal gas from a blast furnace foundation, which can solve the problem of coal gas leakage from the blast furnace foundation and can also recover and reuse the leaked coal gas, thereby reducing waste and creating considerable value.

[0005] To achieve the above-mentioned purpose, the utility model provides a device for recovering gas from a blast furnace foundation, comprising a blast furnace shell, a concrete base connected to the bottom of the blast furnace shell, a furnace foundation gas sealing plate and a heat-resistant base pier arranged in sequence from top to bottom at the lower part of the inner cavity of the blast furnace shell, a cover body is arranged on the top and the outer side of the side wall of the concrete base, and a gap is formed between the inner wall of the cover body and the outer wall of the concrete base; the cover body is connected to a gas recovery pipeline through a derivation pipe, and an exhaust fan is connected to the derivation pipe.

[0006] As a further improvement of the utility model, an electric butterfly valve is connected to the outlet pipe between the exhaust fan and the gas recovery pipeline.

[0007] As a further improvement of the utility model, a bypass pipe is connected to the outlet pipe between the cover body and the exhaust fan, and a gas release valve is connected to the bypass pipe.

[0008] As a further improvement of the utility model, the cover body is connected to a plurality of nitrogen purge pipes, the nitrogen purge pipes are communicated with the inner cavity of the cover body; and the nitrogen purge pipes are connected to valves.

[0009] As a further improvement of the utility model, the cover body includes a top cover plate and a side cover plate connected to each other; a gap is left between the lower surface of the top cover plate and the upper surface of the concrete base, and a through hole is provided in the middle of the top cover plate for sealing with the outer side wall of the lower part of the blast furnace shell; a gap is left between the inner wall of the side cover plate and the outer side wall of the concrete base.

[0010] As a further improvement of the utility model, a sealing gasket is provided between the lower edge of the side cover plate and the outer side wall of the concrete base, and a first bolt is passed through the side cover plate. The first bolt passes through the sealing gasket and is threadedly connected to the concrete base.

[0011] As a further improvement of the utility model, the bottom surface of the top cover plate is connected to a top plate support frame, and the top plate support frame is located between the top cover plate and the top surface of the concrete base; the inner side of the side cover plate is connected to a side plate support frame, and the side plate support frame is located between the side cover plate and the side surface of the concrete base; a second bolt is passed through the side plate support frame, and the second bolt is threadedly connected to the concrete base.

[0012] Beneficial Effects

[0013] Compared with the prior art, the advantages of the device for recovering coal gas from the blast furnace foundation of the utility model are:

[0014] 1. The exhaust fan is started to form a negative pressure in the hood. When the gas leaks from the concrete base, the gas enters the hood and enters the gas recovery pipeline through the outlet pipe for gas recovery. This can not only completely solve the gas leakage problem of the blast furnace foundation, ensure the safety of the working environment in this area, but also create considerable benefits.

[0015] 2. If the furnace top pressure equalizing gas recovery equipment is shut down, stop and shut down the exhaust fan and electric butterfly valve, and open the bypass pipe to release the gas.

[0016] 3. The residual air in the alarm hood can be purged in advance through the nitrogen purge pipe to minimize the oxygen content during gas recovery and improve the safety of recovery.

[0017] 4. The inner side of the cover is supported by a frame to prevent deformation.

[0018] 5. The sealing gasket can prevent gas from leaking from the gap between the side cover of the hood and the concrete base, reducing waste.

[0019] The present invention will become more clear through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1It is a front cross-sectional view of a device for recovering coal gas from a blast furnace foundation;

[0022] Figure 2 for Figure 1 A partial enlarged view of

[0023] Figure 3 for Figure 2 A partial enlarged view of . DETAILED DESCRIPTION

[0024] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0025] Example

[0026] The specific implementation of the utility model is as follows Figures 1 to 3 As shown, a device for recovering coal gas from a blast furnace foundation comprises a blast furnace shell 1, a concrete base 2 is connected to the bottom of the blast furnace shell 1, a furnace base coal gas sealing plate 11 and a heat-resistant base pier 3 are arranged in sequence from top to bottom in the lower part of the inner cavity of the blast furnace shell 1, a cover body 8 is arranged on the top and the outer side of the side wall of the concrete base 2, and a gap is formed between the inner wall of the cover body 8 and the outer wall of the concrete base 2. The cover body 8 is connected to a coal gas recovery pipeline 41 through a derivation pipe 4, and an exhaust fan 9 is connected to the derivation pipe 4.

[0027] The outlet pipe 4 between the exhaust fan 9 and the gas recovery pipeline 41 is connected with an electric butterfly valve 10. The outlet pipe 4 between the cover body 8 and the exhaust fan 9 is connected with a bypass pipe 6, and the bypass pipe 6 is connected with a gas release valve 61.

[0028] The cover body 8 is connected with a plurality of nitrogen purge pipes 7, which are in communication with the inner cavity of the cover body 8. The nitrogen purge pipes 7 are connected with valves 71.

[0029] The cover body 8 includes a top cover plate 81 and a side cover plate 82 connected to each other, both of which are steel plates and welded to each other. A gap is left between the lower surface of the top cover plate 81 and the upper surface of the concrete base 2, and a through hole is provided in the middle of the top cover plate 81 to seal with the outer wall of the lower part of the blast furnace shell 1. A gap is left between the inner wall of the side cover plate 82 and the outer wall of the concrete base 2.

[0030] A sealing gasket 5 is provided between the lower edge of the side cover plate 82 and the outer side wall of the concrete base 2, and a first bolt 86 is passed through the side cover plate 82, and the first bolt 86 passes through the sealing gasket 5 and is threadedly connected to the concrete base 2. The sealing gasket 5 can prevent gas from leaking from the gap between the side cover plate 82 of the cover body 8 and the concrete base 2, thereby reducing waste.

[0031] The bottom surface of the top cover plate 81 is connected to a top plate support frame 83, and the top plate support frame 83 is located between the top cover plate 81 and the top surface of the concrete base 2. The inner side surface of the side cover plate 82 is connected to a side plate support frame 84, and the side plate support frame 84 is located between the side cover plate 82 and the side surface of the concrete base 2. The side plate support frame 84 is penetrated by a second bolt 85, and the second bolt 85 is threadedly connected to the concrete base 2. Among them, the top plate support frame 83 and the side plate support frame 84 are both made of channel steel.

[0032] The exhaust fan 9 is started to form a negative pressure in the cover body 8. When the gas leaks from the concrete base, the gas enters the cover body 8 and enters the gas recovery pipeline 41 through the outlet pipe 4 for gas recovery, which can not only completely solve the gas leakage problem of the blast furnace foundation, ensure the safety of the working environment in this area, but also create considerable benefits.

[0033] Before the device for recovering coal gas from the blast furnace base is put into use, the residual air inside the device is first purged cleanly with nitrogen, and then the exhaust fan 9 is started to introduce the coal gas leaked from the blast furnace base into the furnace top pressure-equalizing coal gas recovery pipeline 41. If the furnace top pressure-equalizing coal gas recovery equipment is shut down, the exhaust fan 9 is stopped and shut down, and the vent valve 61 of the bypass pipe 6 is opened to release the coal gas. Because the coal gas leaked from the furnace base cannot be recovered by the recovery equipment, the coal gas can only be released at high altitude through the bypass pipe 6, otherwise the furnace base coal gas sealing plate 11 will burst due to the coal gas having nowhere to release pressure.

[0034] The present invention is described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A device for recovering coal gas from a blast furnace foundation, comprising a blast furnace shell (1), a concrete base (2) connected to the bottom of the blast furnace shell (1), a furnace foundation coal gas sealing plate (11) and a heat-resistant base pier (3) arranged in sequence from top to bottom in the lower part of the inner cavity of the blast furnace shell (1), characterized in that: A cover body (8) is provided on the top and the outer side of the side wall of the concrete base (2), and a gap is formed between the inner wall of the cover body (8) and the outer wall of the concrete base (2); the cover body (8) is connected to a gas recovery pipeline (41) via a discharge pipe (4), and an exhaust fan (9) is connected to the discharge pipe (4).

2. The device for recovering coal gas from a blast furnace foundation according to claim 1, characterized in that: An electric butterfly valve (10) is connected to the outlet pipe (4) between the exhaust fan (9) and the gas recovery pipeline (41).

3. The device for recovering coal gas from a blast furnace foundation according to claim 2, characterized in that: The outlet pipe (4) between the cover body (8) and the exhaust fan (9) is connected to a bypass pipe (6), and the bypass pipe (6) is connected to a gas release valve (61).

4. The device for recovering coal gas from a blast furnace foundation according to claim 1, characterized in that: The cover body (8) is connected to a plurality of nitrogen purge pipes (7), and the nitrogen purge pipes (7) are in communication with the inner cavity of the cover body (8); and the nitrogen purge pipes (7) are connected to valves (71).

5. The device for recovering coal gas from a blast furnace foundation according to claim 1, characterized in that: The cover body (8) comprises a top cover plate (81) and a side cover plate (82) connected to each other; a gap is left between the lower surface of the top cover plate (81) and the upper surface of the concrete base (2); a through hole is provided in the middle of the top cover plate (81) for sealing with the outer side wall of the lower part of the blast furnace shell (1); and a gap is left between the inner side wall of the side cover plate (82) and the outer side wall of the concrete base (2).

6. The device for recovering coal gas from a blast furnace foundation according to claim 5, characterized in that: A sealing gasket (5) is provided between the lower edge of the side cover plate (82) and the outer side wall of the concrete base (2); a first bolt (86) is passed through the side cover plate (82); the first bolt (86) passes through the sealing gasket (5) and is threadedly connected to the concrete base (2).

7. The device for recovering coal gas from a blast furnace foundation according to claim 5, characterized in that: The bottom surface of the top cover plate (81) is connected to a top plate support frame (83), and the top plate support frame (83) is located between the top cover plate (81) and the top surface of the concrete base (2); the inner side surface of the side cover plate (82) is connected to a side plate support frame (84), and the side plate support frame (84) is located between the side cover plate (82) and the side surface of the concrete base (2); a second bolt (85) is passed through the side plate support frame (84), and the second bolt (85) is threadedly connected to the concrete base (2).

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