Safety device for preventing flash explosion caused by coal gas gathering in blow-down pipe of electric furnace

Abstract

The utility model discloses a safety device for preventing flash explosion caused by gas gathering in an electric furnace blow-down pipe, which comprises a water inlet pipeline and an overflow pipeline which are connected on the blow-down pipe, the water inlet pipeline is positioned below the overflow pipeline, and the water inlet pipeline and the overflow pipeline are both positioned above an emptying valve on the blow-down pipe. The effects of reducing the risk of gas explosion and improving the running safety of the blow-down pipe are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas venting safety devices, in particular to a safety device that prevents flash explosion from occurring due to gas accumulation in an electric furnace venting pipe. Background Art

[0002] The vast majority of yellow phosphorus production companies in the industry use the electric furnace method to produce phosphorus. Yellow phosphorus tail gas is one of the main by-products of yellow phosphorus production. When the electric furnace vent pipe needs maintenance or the electric furnace molten pool collapses or reacts violently, causing a sudden pressure change, the vent valve needs to be opened in the shortest possible time to release the yellow phosphorus tail gas pressure and achieve the purpose of safe production.

[0003] When the distance between the gas vent valve and the vent port of the electric furnace vent pipe is long, after the vent pipe is closed (or is not closed tightly), the small amount of gas floating in the vent pipe combines with the air and there is a risk of explosion. Summary of the invention

[0004] The technical problem to be solved by the utility model is that the residual gas in the gas vent pipe has the risk of explosion after combining with air.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a safety device for preventing gas accumulation in the vent pipe of an electric furnace from flashing and exploding, comprising a water inlet pipeline and an overflow pipeline connected to the vent pipe, the water inlet pipeline being located below the overflow pipeline, and both the water inlet pipeline and the overflow pipeline being located above the vent valve on the vent pipe.

[0006] Preferably, both the water inlet pipeline and the overflow pipeline are provided with U-shaped water seals.

[0007] Preferably, the vent pipe is also connected to a nitrogen pipeline, and the nitrogen pipeline is located above the overflow pipeline.

[0008] Preferably, a check valve and a second pressure gauge are provided on the nitrogen pipeline.

[0009] Preferably, a first pressure gauge is connected to the overflow pipeline.

[0010] 1. The utility model provides a safety device for preventing flash explosion caused by gas accumulation in the vent pipe of an electric furnace. A water inlet pipeline and an overflow pipeline are connected to the vent pipe, and the water inlet pipeline and the overflow pipeline are arranged above the vent valve. Water is sent through the water inlet pipeline to form a gas water seal above the vent valve, and the residual gas in the vent pipe is squeezed out of the vent pipe, thereby eliminating the safety hazard of residual gas in the vent pipe.

[0011] 2. Arranging a nitrogen pipeline above the overflow pipeline can displace the gas in the vent pipe, avoid the vent pipe being in a negative pressure state, and improve the safety of the vent pipe operation.

[0012] 3. Install U-shaped water seals on the water inlet pipeline and overflow pipeline to avoid gas backflow in the vent pipe and improve the safety of the water inlet pipeline and overflow pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.

[0015] In the figure: 1. main water seal of electric furnace; 2. vent pipe; 3. vent valve; 4. water inlet pipeline; 5. overflow pipeline; 6. first pressure gauge; 7. water inlet valve; 8. U-shaped water seal; 9. nitrogen pipeline; 10. check valve; 11. second pressure gauge. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, the utility model provides a safety device for preventing gas accumulation in an electric furnace vent pipe from flashing and exploding, comprising an inlet pipeline 4 and an overflow pipeline 5 connected to the vent pipe 2, the inlet pipeline 4 being located below the overflow pipeline 5, and the inlet pipeline 4 and the overflow pipeline 5 being located above the vent valve 3 on the vent pipe 2.

[0017] A water inlet pipeline 4 is connected about 20 mm above the bottom end of the electric furnace total water seal 1 and the vent pipe 2, and an overflow pipeline 5 is connected about 10 mm above the water inlet pipeline 4. A water inlet valve 7 is connected to the water inlet pipeline 4 to control the water inlet of the water inlet pipeline 4 to form a water seal at the inner bottom of the vent pipe 2, and excess water in the water inlet pipeline 4 is discharged through the overflow pipeline 5.

[0018] like Figure 1 As shown, in order to improve the safety of the operation of the water inlet pipeline 4 and the overflow pipeline 5, a U-shaped water seal 8 is provided on the water inlet pipeline 4 and the overflow pipeline 5. By installing the U-shaped water seal 8 on the water inlet pipeline 4 and the overflow pipeline 5, after the vent valve 3 is opened, the water at the bottom of the vent pipe 2 falls, and the U-shaped water seal 8 on the water inlet pipeline 4 and the overflow pipeline 5 can prevent the gas in the vent pipe 2 from flowing back into the water inlet pipeline 4 and the overflow pipeline 5.

[0019] like Figure 1 The vent pipe 2 is also connected to a nitrogen pipeline 9, which is located above the overflow pipeline 5. After a water seal is formed at the bottom of the vent pipe 2, nitrogen is transported into the vent pipe 2 through the nitrogen pipeline 9 to replace the gas remaining at the top of the vent pipe 2 and discharge the gas, thereby ensuring the safety of the vent pipe 2 operation.

[0020] like Figure 1As shown, in order to prevent the gas from entering the nitrogen pipeline 9 when the vent pipe 2 is evacuating the gas, a check valve 10 and a second pressure gauge 11 are provided on the nitrogen pipeline 9. The check valve 10 ensures the one-way flow of gas in the nitrogen pipeline 9, and the second pressure gauge 11 is provided to detect the nitrogen transported by the nitrogen pipeline 9. During the nitrogen transport process, the value change of the second pressure gauge 11 is used to confirm the normal transport of nitrogen.

[0021] like Figure 1 As shown. The overflow pipeline 5 is connected to a first pressure gauge 6. During the water delivery process of the water inlet pipeline 4, if the drainage speed of the overflow pipeline 5 cannot keep up with the water delivery speed of the water inlet pipeline 4, the liquid level in the vent pipe 2 will increase, resulting in an increase in the water pressure value detected by the first pressure gauge 6. To prevent the liquid level from exceeding the nitrogen pipeline 9, when the indicated pressure of the first pressure gauge 6 reaches the set pressure, the staff should close the water inlet valve 7 in time to stop the water delivery of the water inlet pipeline 4.

Claims

1. A safety device to prevent flash explosion caused by gas accumulation in the vent pipe of an electric furnace, characterized in that: The invention comprises a water inlet pipeline (4) and an overflow pipeline (5) connected to the vent pipe (2), wherein the water inlet pipeline (4) is located below the overflow pipeline (5), and the water inlet pipeline (4) and the overflow pipeline (5) are both located above the vent valve (3) on the vent pipe (2).

2. A safety device for preventing flash explosion caused by gas accumulation in an electric furnace vent pipe as claimed in claim 1, characterized in that: The water inlet pipeline (4) and the overflow pipeline (5) are both provided with a U-shaped water seal (8).

3. A safety device for preventing flash explosion caused by gas accumulation in an electric furnace vent pipe as claimed in claim 1, characterized in that: The vent pipe (2) is also connected to a nitrogen pipeline (9), and the nitrogen pipeline (9) is located above the overflow pipeline (5).

4. A safety device for preventing flash explosion caused by gas accumulation in an electric furnace vent pipe as claimed in claim 3, characterized in that: The nitrogen pipeline (9) is provided with a check valve (10) and a second pressure gauge (11).

5. A safety device for preventing flash explosion caused by gas accumulation in an electric furnace vent pipe as claimed in claim 4, characterized in that: The overflow pipeline (5) is connected to a first pressure gauge (6).

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