Emergency cut-off device for preventing natural gas leakage

Abstract

The utility model relates to an emergency cut-off device for preventing natural gas leakage and belongs to the technical field of blast furnaces. Comprising a natural gas branch pipe, the natural gas branch pipe penetrates through a cut-off control box, an electromagnetic valve is arranged in the cut-off control box, and the electromagnetic valve is arranged on the natural gas branch pipe; one end of the natural gas branch pipe is connected with a natural gas pipe, the other end of the natural gas branch pipe is arranged in the baking oven, a sliding nozzle hole is formed in the bottom of the baking oven, a sliding nozzle penetrates through the sliding nozzle hole, and an outlet of the natural gas branch pipe arranged in the baking oven faces the sliding nozzle; a flame detector is arranged in the baking box in a penetrating mode, a flame detection switch is arranged in the cut-off control box, the flame detector is electrically connected with the flame detection switch, and the flame detection switch is in signal connection with the electromagnetic valve. The flame detector is used for detecting flames during baking of the chute nozzle so as to control connection and disconnection of the natural gas branch pipeline, energy waste is reduced, and poisoning accidents caused by natural gas leakage are avoided.

Description

Technical Field

[0001] The utility model relates to an emergency cut-off device for preventing natural gas leakage, belonging to the technical field of blast furnaces. Background Technique

[0002] Before replacing the swing launder of the blast furnace hearth, it is necessary to bake the launder spare parts. The original baking method is as follows: make an iron sheet baking oven, place the launder spare parts inside, place combustibles on the surface of the swing launder, and after igniting the combustibles, introduce natural gas to bake the swing launder. Due to the long baking time, it is very likely that the flame will go out without being noticed by the maintenance personnel in time. At this time, the natural gas is still in the on state. If not discovered in time, the diffusion of natural gas will cause waste of natural gas, and in extreme cases, it will lead to natural gas poisoning accidents. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide an emergency cut-off device for preventing natural gas leakage for the above-mentioned existing technology, which monitors the flame during the baking of the launder, can cut off the natural gas in time, reduce energy waste, and avoid the occurrence of poisoning accidents caused by natural gas leakage.

[0004] The technical solution adopted by the utility model to solve the above problems is as follows: an emergency cut-off device for preventing natural gas leakage, including a natural gas branch pipe, the natural gas branch pipe passes through a cut-off control box, and an electromagnetic valve is arranged in the cut-off control box, and the electromagnetic valve is arranged on the natural gas branch pipe; one end of the natural gas branch pipe is connected to a natural gas pipe, and the other end of the natural gas branch pipe is arranged inside the baking oven. A launder hole is opened at the bottom of the baking oven, and the launder passes through the launder hole. The outlet of the natural gas branch pipe arranged inside the baking oven faces the launder; a flame detector passes through the baking oven, a flame detection switch is arranged in the cut-off control box, the flame detector is electrically connected to the flame detection switch, and the flame detection switch is signal-connected to the electromagnetic valve.

[0005] A manual valve is arranged on the natural gas branch pipe, and the manual valve is arranged on the inlet side of the electromagnetic valve.

[0006] A detection hole is opened on the side of the baking oven, and the flame detector passes through the detection hole.

[0007] The flame detector is an ultraviolet flame detector.

[0008] Compared with the existing technology, the advantages of the utility model are as follows: an emergency cut-off device for preventing natural gas leakage, the flame detector detects the flame during the baking of the launder, and then controls the on-off of the natural gas branch pipeline, which not only reduces energy waste, but also avoids the occurrence of poisoning accidents caused by natural gas leakage, and is applicable to the flame monitoring of various atmosphere burners and combustion-supporting air burners. Description of the Drawings

[0009] Figure 1 Schematic diagram of an emergency cut-off device for preventing natural gas leakage according to an embodiment of the present utility model;

[0010] In the figure, 1 is an oven, 2 is a nozzle hole, 3 is an ultraviolet flame detector, 4 is a flame detection switch, 5 is a cut-off control box, 6 is a solenoid valve, 7 is a natural gas branch pipe, 8 is a manual valve, and 9 is a natural gas pipe. Specific embodiments

[0011] The present utility model will be further described in detail below in conjunction with the embodiments with reference to the accompanying drawings.

[0012] As Figure 1 shown, an emergency cut-off device for preventing natural gas leakage in this embodiment includes a natural gas branch pipe 7. The natural gas branch pipe 7 passes through the cut-off control box 5. A solenoid valve 6 is provided in the cut-off control box 5. The solenoid valve 6 is provided on the natural gas branch pipe 7. One end of the natural gas branch pipe 7 is connected to the natural gas pipe 9, and the other end of the natural gas branch pipe 7 is provided in the oven 1. A nozzle hole 2 is opened at the bottom of the oven 1. A nozzle passes through the nozzle hole 2. The outlet of the natural gas branch pipe 7 provided in the oven 1 faces the nozzle to provide combustible gas for baking the nozzle. A detection hole is opened on the side of the oven 1. The ultraviolet flame detector 3 passes through the detection hole. A flame detection switch 4 is provided in the cut-off control box 5. The ultraviolet flame detector 3 is electrically connected to the flame detection switch 4, and the flame detection switch 4 is signal-connected to the solenoid valve 6. By sensing the ultraviolet rays generated by the flame through the ultraviolet flame detector 3, the alternating current of the photosensitive tube in the ultraviolet flame detector will be converted into direct current by the rectifier, and the signal amplifier amplifies the direct current and outputs it to the flame detection switch. The flame detection switch converts the amplified direct current into a switching quantity signal and outputs it to control the opening and closing of the solenoid valve, thereby controlling the on-off of the natural gas branch pipe.

[0013] A manual valve 8 is provided on the above-mentioned natural gas branch pipe 7. The manual valve is provided on the inlet side of the solenoid valve and is used to manually control the on-off of the natural gas branch pipe.

[0014] By detecting the flame during nozzle baking through the flame detector, and then controlling the on-off of the natural gas branch pipeline, not only energy waste is reduced, but also the occurrence of poisoning accidents caused by natural gas leakage is avoided, which is applicable to the flame monitoring of various atmosphere burners and combustion-supporting air burners.

[0015] In addition to the above embodiments, the present utility model also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution shall fall within the protection scope of the claims of the present utility model.

Claims

1. An emergency cut-off device for preventing natural gas leakage, characterized in that: It includes a natural gas branch pipe which passes through a cut-off control box. An electromagnetic valve is provided in the cut-off control box and is arranged on the natural gas branch pipe. One end of the natural gas branch pipe is connected to a natural gas pipe, and the other end of the natural gas branch pipe is arranged inside an oven. A spout hole is opened at the bottom of the oven, and a spout passes through the spout hole. The outlet of the natural gas branch pipe arranged inside the oven faces the spout. The oven is provided with a flame detector, and a flame detection switch is arranged in the cut-off control box. The flame detector is electrically connected to the flame detection switch, and the flame detection switch is signal-connected to the electromagnetic valve.

2. The emergency cut-off device for preventing natural gas leakage according to claim 1, wherein: A manual valve is provided on the natural gas branch pipe, and the manual valve is arranged on the inlet side of the electromagnetic valve.

3. The emergency cut-off device for preventing natural gas leakage according to claim 1, wherein: A detection hole is opened on the side of the oven, and the flame detector passes through the detection hole.

4. An emergency cut-off device for preventing natural gas leakage according to claim 1, characterized in that: The flame detector is an ultraviolet flame detector.

Images