Blast furnace gas recovery system

Abstract

The utility model discloses a blast furnace gas recovery system, which belongs to the field of gas recovery, and comprises a blast furnace for generating blast furnace gas, and the blast furnace is externally connected with a pressure control pipeline and a gas recovery pipeline with a cinder valve; the pressure control pipeline comprises a first pressure equalizing pipeline with a pressure equalizing valve I and a first bleeding pipeline with a bleeding valve I. The gas recovery pipeline comprises a second pressure equalizing pipeline with a pressure equalizing valve II, a second bleeding pipeline with a bleeding valve II and a main pipeline with a gas recovery valve. A branch opening is formed in the main pipeline, the first diffusion pipeline is connected with the branch opening, and a protector is further arranged on the main pipeline between the gas recovery valve and the branch opening; according to the utility model, full recovery of blast furnace gas is realized, and waste of resources and pollution to the environment are avoided.

Description

Technical Field

[0001] The utility model relates to a coal gas recovery system, in particular to a blast furnace coal gas recovery system, belonging to the field of coal gas recovery. Background Art

[0002] The top gas relief valve is installed on the vent pipe at the top of an ironmaking blast furnace to safely release gas. During normal blast furnace operation, a constant internal pressure must be maintained. When the pressure inside the blast furnace rises, the top relief valve automatically opens, discharging some of the blast furnace gas generated during ironmaking to release excess pressure, thereby maintaining a constant pressure within the blast furnace and preventing accidents caused by pressure fluctuations. However, as blast furnace gas is the primary energy source used in steel production, directly releasing it into the atmosphere not only wastes resources but also causes certain environmental damage. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a blast furnace gas recovery system, which realizes the full recovery of blast furnace gas and avoids the waste of resources and pollution to the environment.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A blast furnace gas recovery system, comprising a blast furnace that generates blast furnace gas, the blast furnace being externally connected to a pressure control pipeline and a gas recovery pipeline with an ash discharge valve; the pressure control pipeline comprising a No. 1 pressure equalizing pipeline with a pressure equalizing valve I and a No. 1 relief pipeline with a relief valve I, the gas recovery pipeline comprising a No. 2 pressure equalizing pipeline with a pressure equalizing valve II, a No. 2 relief pipeline with a relief valve II, and a main pipeline with a gas recovery valve; characterized in that: a branch port is provided on the main pipeline, the No. 1 relief pipeline is connected to the branch port, and a fuse is further provided on the main pipeline between the gas recovery valve and the branch port; the fuse comprises It includes a fuse body tube that is detachably mounted on the main pipeline and passes through the main pipeline, and a rotating disc that is hinged to the inside of the fuse body tube through a rotating shaft and realizes gas circulation or closure by swinging. A sealing ring is provided on the outer wall of the rotating disc, and a baffle is fixed on the inner wall of the fuse body tube on the side of the rotating disc facing away from the airflow to prevent the rotating disc from opening in reverse. After the rotating disc is closed, it abuts against one side wall of the baffle. The baffle is divided into two parts: a blocking part that is close to the rotating disc and a semi-cylindrical partition part. The vertical height of the blocking part is less than the height of the partition part, and the top surface of the partition part is parallel to the rotating shaft.

[0006] A further improvement of the technical solution of the present utility model is that: a central through hole is provided on the rotating disc through which the rotating shaft can pass, and the rotating shaft is fixed on the inner wall of the fuse body tube after passing through the rotating disc.

[0007] A further improvement of the technical solution of the present utility model is that an emergency ball valve I and an emergency ball valve II are further provided on the No. 1 relief pipe.

[0008] A further improvement of the technical solution of the present utility model is that the vertical height of the blocking portion is half of the partition portion.

[0009] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0010] The utility model provides a branch port on the main pipeline of the gas recovery pipeline, connects the No. 1 vent pipeline with the branch port, realizes the full recovery of blast furnace gas, avoids waste of resources and also avoids air pollution; the utility model also provides a safety device between the gas recovery valve and the branch port, which can prevent the backflow of part of the blast furnace gas released in the No. 1 vent pipeline from entering the main pipeline of the gas recovery pipeline for recovery, thereby ensuring the safety of the system.

[0011] The utility model is also provided with an accident ball valve I and an accident ball valve II on the No. 1 vent pipe, ensuring that part of the blast furnace gas released in the No. 1 vent pipe can smoothly enter the main pipe of the gas recovery pipe and be recovered, thereby avoiding the occurrence of gas backflow accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 This is a cross-sectional view of the fuse of the utility model;

[0014] Figure 3 This is a cross-sectional view of the fuse of the utility model when gas is flowing;

[0015] Figure 4 This is a cross-sectional view of the baffle of the utility model;

[0016] Figure 5 It is a side view of the baffle gas recovery valve of the utility model.

[0017] Among them, 1. blast furnace; 2. ash discharge valve; 3. equalizing valve I; 4. relief valve I; 5. relief valve II; 6. gas recovery valve; 7. equalizing valve II; 8. main pipeline; 9. No. 1 relief pipeline; 10. emergency ball valve I; 11. emergency ball valve II; 12. fuse; 14. fuse body tube; 15. rotating disc; 16; rotating shaft; 17. baffle; 18. sealing ring; 19. blocking part; 20. partition part. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below with reference to the embodiments:

[0019] The original blast furnace gas recovery system includes a blast furnace 1 that generates blast furnace gas. Blast furnace 1 is connected to a pressure control pipe and a gas recovery pipe with an ash discharge valve 2. The pressure control pipe includes a No. 1 equalizing pipe with a pressure equalizing valve I3 and a No. 1 relief pipe 9 with a relief valve I4. The gas recovery pipe includes a No. 2 equalizing pipe with a pressure equalizing valve II5, a No. 2 relief pipe with a relief valve II7, and a main pipe 8 with a gas recovery valve 6. When the internal pressure of the blast furnace is too high, relief valve I4 is opened to discharge some of the blast furnace gas generated by blast furnace 1 to the outside, maintaining the internal pressure at a normal level and preventing accidents. However, as the main energy source for steel enterprises' internal production, direct discharge of blast furnace gas into the atmosphere not only wastes resources but also pollutes the environment.

[0020] like Figure 1 As shown, the utility model sets a branch port on the main pipeline 8, connects the No. 1 vent pipe 9 to the main pipeline 8, realizes the full recovery of blast furnace gas, avoids waste of resources and also avoids air pollution.

[0021] A gas recovery valve 6 and a branch port are provided between the gas recovery valve 6 and the branch port. Figure 2 The fuse 12 shown in the figure comprises a fuse body tube 14 detachably mounted on the main pipe 8 and connected to the main pipe 8, and a rotating disc 15 hinged to the inside of the fuse body tube 14 by a rotating shaft 16 and realizing gas circulation or closing by swinging. A sealing ring 18 is sleeved on the outer wall of the rotating disc 15, and a baffle 17 is fixed on the inner wall of the fuse body tube 14 on the side of the rotating disc 15 facing away from the airflow to prevent the rotating disc 15 from opening in the reverse direction. When the rotating disc 15 is closed, it abuts against one side wall of the baffle 17, as shown in FIG. Figure 4 As shown, the baffle 17 is divided into two parts: a blocking portion 19 close to the rotating disk 15 and a semi-cylindrical partition portion 20. The vertical height of the blocking portion 19 is smaller than the height of the partition portion 20, and the top surface of the partition portion 20 is parallel to the rotating shaft 16.

[0022] like Figure 3As shown, when the system normally recovers the blast furnace gas produced by the blast furnace 1, the rotating disc 15 is subjected to the blowing force of the gas. Due to the presence of the blocking portion 19 of the baffle 17, the rotating disc 15 will rotate. At this time, a gap will be generated between the fuse body tube 14 and the sealing ring 18, and the gas will circulate, and the blast furnace gas will enter the main line 8 and be collected; when the internal pressure of the blast furnace 1 is too high, the vent valve I4 is opened, and part of the blast furnace gas produced by the blast furnace 1 is released into the main line 8 through the No. 1 vent pipe 9 to be recovered to maintain the normal pressure of the system. When this part of the blast furnace gas enters the main line 8, backflow may occur. At this time, due to the presence of the partition part 20, the gas located in the lower half of the main line 8 will be blocked by the partition part 20, and the gas located in the upper half of the main line 8 will generate a blowing force on the rotating disc 15, but due to the presence of the blocking portion 19, the rotating disc 15 will not rotate, and the gas cannot circulate, thereby avoiding the occurrence of backflow accidents and ensuring the safety of the system.

Claims

1. A blast furnace gas recovery system, comprising a blast furnace (1) for generating blast furnace gas, wherein the blast furnace (1) is externally connected to a pressure control pipeline and a gas recovery pipeline with an ash discharge valve (2); the pressure control pipeline comprises a No. 1 pressure equalizing pipeline with a pressure equalizing valve I (3) and a No. 1 relief pipeline (9) with a relief valve I (4); the gas recovery pipeline comprises a No. 2 pressure equalizing pipeline with a pressure equalizing valve II (5), a No. 2 relief pipeline with a relief valve II (7), and a main pipeline (8) with a gas recovery valve (6); characterized in that: The main pipeline (8) is provided with a branch port, the first venting pipeline (9) is connected to the branch port, and a fuse (12) is also provided on the main pipeline (8) between the gas recovery valve (6) and the branch port; The fuse (12) comprises a fuse body tube (14) detachably mounted on the main pipe (8) and communicating with the main pipe (8), and a rotating disc (15) hinged to the inside of the fuse body tube (14) via a rotating shaft (16) and realizing gas circulation or closing by swinging. A sealing ring (18) is sleeved on the outer wall of the rotating disc (15), and a baffle (17) is fixed on the inner wall of the fuse body tube (14) on the side of the rotating disc (15) facing away from the airflow to prevent the rotating disc (15) from opening in the reverse direction. When the rotating disc (15) is closed, it abuts against a side wall of the baffle (17). The baffle (17) is divided into two parts: a blocking part (19) closely attached to the rotating disc (15) and a semi-cylindrical partition part (20). The vertical height of the blocking part (19) is less than the height of the partition part (20), and the top surface of the partition part (20) is parallel to the rotating shaft (16).

2. A blast furnace gas recovery system according to claim 1, characterized in that: The rotating disc (15) is provided with a central through hole through which a rotating shaft (16) can pass. The rotating shaft (16) passes through the rotating disc (15) and is fixed on the inner wall of the fuse body tube (14).

3. A blast furnace gas recovery system according to claim 1, characterized in that: The No. 1 relief pipe (9) is also provided with an emergency ball valve I (10) and an emergency ball valve II (11).

4. A blast furnace gas recovery system according to claim 1, characterized in that: The vertical height of the blocking portion (19) is half of the partition portion (20).

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