Blast furnace damping-down gas recovery equipment

Abstract

The utility model discloses a blast furnace damping-down gas recovery device which comprises a gas recovery chamber, the gas recovery chamber is divided into a left cavity and a right cavity through a partition plate, a gas pipeline communicated with the left cavity is arranged on the side face of the gas recovery chamber, a gas filtering mechanism is arranged in the left cavity, and a gas outlet is formed in the right cavity. And an outlet of the coal gas filtering mechanism penetrates through the partition plate and extends into the right cavity. According to the blast furnace damping-down gas recovery equipment, during blast furnace damping-down, gas can be recovered, purified and reused, and environmental pollution can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal gas recovery, in particular to a blast furnace off-air coal gas recovery device. Background Art

[0002] The traditional blast furnace shutdown process requires the release of coal gas into the atmosphere, but direct discharge of coal gas into the atmosphere is prone to pollution. In order to protect the environment, this application proposes a gas recovery device for recycling and utilizing the shutdown coal gas. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a blast furnace off-gas gas recovery device, which can recover and purify the gas for reuse, thereby helping to reduce environmental pollution.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a blast furnace off-air gas recovery device, comprising a gas recovery chamber, the gas recovery chamber being divided into a left chamber and a right chamber by a partition, a gas pipeline connected to the left chamber being provided on the side of the gas recovery chamber, a gas filter mechanism being provided in the left chamber, the outlet of the gas filter mechanism extending through the partition into the right chamber;

[0005] A steam ejector is provided in the right chamber, a steam pipe is provided at the inlet of the steam ejector, and a buffer tower is connected to the outlet of the steam ejector through a first pipe running through the outside of the gas recovery chamber. The buffer tower is connected to the gas pipeline network in the plant area through a second pipe, and a drainage mechanism is provided on the buffer tower.

[0006] Preferably, the gas filtering mechanism adopts a bag dust collector.

[0007] Preferably, the drainage mechanism includes a drainage pipe provided at the bottom of the buffer tower, a water level detector is provided in the buffer tower, and a first valve is provided on the drainage pipe.

[0008] Preferably, a second valve is provided on the second pipeline.

[0009] Preferably, a third valve and a fourth valve are provided on the steam pipeline and the gas pipeline respectively.

[0010] Preferably, the bottom of the buffer tower is arranged in an arc shape.

[0011] The utility model provides a blast furnace off-gas recovery device, which has the following beneficial effects:

[0012] The blast furnace gas recovery equipment can draw the gas into the left chamber of the gas recovery chamber through steam ejection when the blast furnace is shut down. The bag dust collector can remove the residue in the gas, so that the purified gas enters the steam ejector and is discharged into the buffer tower and then enters the gas network through the second pipeline for recycling. It is beneficial to save resources and reduce environmental pollution when used. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model.

[0015] In the figure: 1. Gas recovery chamber; 2. Partition; 3. Left chamber; 4. Right chamber; 5. Gas pipeline; 6. Steam ejector; 7. Steam pipeline; 8. First pipeline; 9. Buffer tower; 10. Second pipeline; 11. Bag collector; 12. Drain pipe; 13. Water level detector; 14. First valve; 15. Second valve; 16. Third valve; 17. Fourth valve; 18. One-way valve. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to specific embodiments. Figures 1 to 2 As shown:

[0017] Example 1: A blast furnace off-gas gas recovery device includes a gas recovery chamber 1, which is divided into a left chamber 3 and a right chamber 4 by a partition 2. A gas pipeline 5 is provided on the side of the gas recovery chamber 1 and communicates with the left chamber 3. The gas originally exhausted from the blast furnace enters the left chamber 3 through the gas pipeline 5.

[0018] A gas filter mechanism is provided in the left chamber 3. The outlet of the gas filter mechanism extends through the partition 2 and into the right chamber 4. The gas filter mechanism can filter out residues and the like in the gas, and the purified gas enters the right chamber 4.

[0019] A steam ejector 6 is provided in the right chamber 4, and a steam pipe 7 is provided at the inlet of the steam ejector 6;

[0020] As the blast furnace wind-down process progresses, the air volume and top pressure of the blast furnace continue to decrease. When the top pressure of the blast furnace drops to the set value, steam enters the steam ejector 6 through the steam pipe 7, thereby forming a negative pressure, and the purified blast furnace gas is drawn into the steam ejector 6;

[0021] The outlet of the steam ejector 6 is connected to a buffer tower 9 through a first pipe 8 that runs through the outside of the gas recovery chamber 1. The buffer tower 9 is connected to the gas network of the plant through a second pipe 10. After the gas enters the buffer tower 9 along with the steam, it enters the gas network through the second pipe 10.

[0022] A drainage mechanism is provided on the buffer tower 9 , and the steam can be discharged from the buffer tower 9 through the drainage mechanism after condensing into water droplets in the buffer tower 9 .

[0023] Example 2: A blast furnace off-air gas recovery device includes a gas recovery chamber 1, which is divided into a left chamber 3 and a right chamber 4 by a partition 2. A gas pipeline 5 is provided on the side of the gas recovery chamber 1 and communicates with the left chamber 3. The gas originally exhausted from the blast furnace enters the left chamber 3 through the gas pipeline 5.

[0024] A gas filter mechanism is provided in the left chamber 3. The gas filter mechanism adopts a bag dust collector 11. The outlet of the gas filter mechanism passes through the partition 2 and extends into the right chamber 4. The gas filter mechanism can filter out the residue and the like in the gas, and the purified gas enters the right chamber 4.

[0025] A steam ejector 6 is provided in the right chamber 4. A steam pipe 7 is provided at the inlet of the steam ejector 6. The connection between the steam pipe and the steam ejector 6 is connected by a metal hose.

[0026] The steam pipe 7 and the gas pipe 5 are provided with a third valve 16 and a fourth valve 17 respectively;

[0027] As the blast furnace wind-down process progresses, the air volume and top pressure of the blast furnace continue to decrease. When the top pressure of the blast furnace drops to the set value, steam enters the steam ejector 6 through the steam pipe 7, thereby forming a negative pressure, and the purified blast furnace gas is drawn into the steam ejector 6;

[0028] The outlet of the steam ejector 6 is connected to a buffer tower 9 via a first pipe 8 that runs through the outside of the gas recovery chamber 1. The buffer tower 9 is connected to the gas network of the plant through a second pipe 10. A second valve 15 is provided on the second pipe 10. After the gas enters the buffer tower 9 along with the steam, it enters the gas network through the second pipe 10.

[0029] The buffer tower 9 is provided with a drainage mechanism, which includes a drainage pipe 12 provided at the bottom of the buffer tower 9, a water level detector 13 provided in the buffer tower 9, and a first valve 14 provided on the drainage pipe 12. The bottom of the buffer tower 9 is arranged in an arc shape. After the steam condenses into water droplets in the buffer tower 9, it can be discharged from the buffer tower 9 through the drainage mechanism.

[0030] A one-way valve 18 is also provided on the steam pipe to prevent the coal gas from flowing back into the steam pipe 7 when the steam pressure is lower than 350kPa.

[0031] The above components are all connected to the controller and controlled by the controller according to the matching program.

[0032] Working principle:

[0033] 1. Ensure that the steam source working pressure is 0.6MPa (during operation) and the flow rate is 20t / h. At the same time, open the third valve 16 and conduct a trial run to check whether the equipment is in good condition.

[0034] 2. After the equipment is in good condition and the blast furnace gas is shut down, open the fourth valve 17 to allow gas to enter through the gas pipe 5. After entering the left chamber 3, the gas is purified by the bag filter 11 to separate the residue and gas. The purified gas enters the right chamber 4 and is discharged into the steam ejector 6 through steam ejection. The gas is then discharged into the buffer tower 9 and enters the gas network through the buffer tower 9.

[0035] 3. The water condensed from the steam in the buffer tank is discharged from the discharge mechanism.

[0036] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A blast furnace off-gas gas recovery device, characterized by: The invention comprises a gas recovery chamber (1), wherein the gas recovery chamber (1) is divided into a left chamber (3) and a right chamber (4) by a partition (2), a gas pipeline (5) communicating with the left chamber (3) is provided on the side of the gas recovery chamber (1), a gas filter mechanism is provided in the left chamber (3), and an outlet of the gas filter mechanism penetrates the partition (2) and extends into the right chamber (4); A steam ejector (6) is provided in the right chamber (4), a steam pipe (7) is provided at the inlet of the steam ejector (6), and a buffer tower (9) is connected to the outlet of the steam ejector (6) through a first pipe (8) that runs through the outside of the gas recovery chamber (1). The buffer tower (9) is connected to the gas network of the plant area through a second pipe (10), and a drainage mechanism is provided on the buffer tower (9).

2. The blast furnace off-gas gas recovery equipment according to claim 1, characterized in that: The coal gas filtering mechanism adopts a bag dust collector (11).

3. The blast furnace off-gas gas recovery equipment according to claim 1, characterized in that: The drainage mechanism comprises a drainage pipe (12) arranged at the bottom of a buffer tower (9), a water level detector (13) is provided in the buffer tower (9), and a first valve (14) is provided on the drainage pipe (12).

4. The blast furnace off-gas gas recovery equipment according to claim 1, characterized in that: A second valve (15) is provided on the second pipeline (10).

5. The blast furnace off-gas gas recovery equipment according to claim 1, characterized in that: The steam pipeline (7) and the gas pipeline (5) are respectively provided with a third valve (16) and a fourth valve (17).

6. The blast furnace off-gas gas recovery equipment according to claim 1, characterized in that: The bottom of the buffer tower (9) is arranged in an arc shape.

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