Gas leakage under-pressure plugging device and method

Abstract

The invention relates to a metallurgical gas leakage prevention and treatment technology, and provides a gas leakage under-pressure plugging device and a gas leakage under-pressure plugging method. The device mainly comprises a sealing box, a purging pipe and a diffusing pipe, the sealing box is tightly attached to the outer wall of a gas pipeline or equipment, and a leakage point can be covered for sealing; the purging pipe is connected with a nitrogen or inert gas source and is used for purging the interior of the sealing box; and the bleeder is responsible for discharging gas. The method comprises the steps of checking leakage points, measuring the plugging size, manufacturing the plugging device, taking safety measures, purging a sealing box with nitrogen, detecting the oxygen content of diffused gas, keeping positive pressure in the sealing box, welding the device on gas equipment, and finally closing a valve to complete plugging. Under-pressure plugging can be carried out on the gas pipeline or equipment under the condition that production is not stopped, the leakage risk is effectively eliminated, and personnel safety and production efficiency are ensured. The device and the method are simple and convenient to operate, safe, reliable and high in applicability, and are important technical innovation in the field of metallurgical gas leakage prevention and control.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical gas leakage prevention and control, and relates to a gas leakage pressure plugging device and method. Background Art

[0002] In metallurgical enterprises, coal gas, as an important secondary energy source, is widely used in coke ovens, sintering machines, hot blast furnaces, roasters, heating furnaces, generators and other equipment. However, due to the characteristics of coal gas such as poisoning, ignition, explosion and corrosion, coal gas pipelines and equipment are prone to perforation and cracking during use, resulting in coal gas leakage. Such leakage will not only affect the production efficiency of the enterprise, but may also pose a serious threat to the life safety of personnel and corporate property.

[0003] Metallurgical enterprises are identified as one of the high-risk industries, largely because a large amount of coal gas (raw gas) is produced during the smelting process of coking, ironmaking and steelmaking. After purification and refining, these coal gases become usable coke oven gas (COG), blast furnace gas (BFG), converter gas (LDG) and mixed coal gas (MIXG), etc. However, the corrosive components in the coal gas, such as hydrogen sulfide (H2S), carbon dioxide (CO2), oxygen (O2) and ammonia (NH3), will cause serious corrosion to the gas pipelines and equipment in the presence of water. In particular, the purification process of coal gas requires spraying water, which causes a large amount of water to be carried in the coal gas, providing conditions for corrosion. H2S and CO2 are acidic in water, NH3 is alkaline in water, and O2 is oxidizing in water. These components work together to form chemical corrosion and oxidative corrosion, which eventually leads to perforation and cracking of gas pipelines and equipment.

[0004] The consequences of gas leakage are serious. Once a gas pipeline or equipment leaks, the local or regional gas concentration will exceed the standard, which may cause safety accidents such as gas poisoning, fire, explosion, etc. In order to ensure the safety of personnel, it is often necessary to interrupt production and deal with the leakage point. However, this method of stopping production will not only affect the production efficiency of the enterprise, but may also bring huge economic losses. In particular, for leaks involving the enterprise's gas main network, it may cause the enterprise to stop production across the board and disrupt the company's production rhythm.

[0005] At present, there are two main methods for metallurgical enterprises to deal with gas leaks. The first method is to interrupt production and purge and convert gas pipelines and equipment. Although this method can safely solve the problem of gas leakage, it takes a long time to handle and affects the production efficiency of the enterprise. The second method is to use special adhesives, clamps, etc. to temporarily seal the leak. Although this method can solve the gas leakage problem in a short time, it cannot completely solve the hidden dangers of gas leakage and can only be used as a temporary emergency measure.

[0006] Therefore, how to ensure the safety of employees' lives and corporate property while not affecting the company's production efficiency when gas leaks occur in gas pipelines, equipment and facilities has become a technical problem that needs to be solved urgently. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a gas leakage pressure plugging device and method, which can realize pressure plugging of gas pipelines, equipment and facilities without stopping production, thereby completely eliminating the safety risks of gas leakage and ensuring personnel safety and production efficiency.

[0008] To achieve the above object, the present invention provides the following technical solutions: a gas leakage pressure plugging device, comprising a sealing box, and a purge pipe and a venting pipe connected to the inside of the sealing box;

[0009] The sealing box is a hollow shell structure, which matches and fits the outer wall shape of the gas pipeline or equipment, and has an opening on the side facing the gas pipeline or equipment, which covers the periphery of the leakage point of the gas pipeline or equipment to seal the leakage point;

[0010] The other end of the sealing box opening is provided with a closed flange, on which a purge port and a vent are provided, a purge pipe is connected to the purge port and is connected to a nitrogen or inert gas source; a vent pipe is connected to the vent for discharging gas;

[0011] The purge port and the relief port are respectively provided with a purge ball valve and a relief ball valve.

[0012] Optionally, the sealing box is made of corrosion-resistant metal material.

[0013] A method for sealing gas leakage under pressure, using the above-mentioned gas leakage sealing device under pressure, comprises the following steps:

[0014] S1, on-site inspection to confirm the gas leakage point, observe the damage shape of the equipment at the leakage point, the size and pressure of the gas leakage, etc.;

[0015] S2, use a thickness gauge to detect the thickness of the equipment at the leakage point to ensure that the thickness of the equipment around the leakage point is not less than the thickness required for welding;

[0016] S3, measure the size of the leak point that needs to be plugged, and make a pressure plugging device according to the shape of the equipment;

[0017] S4, operators should choose to wear air respirators and gas alarms according to the amount of gas leakage on site and take relevant safety measures;

[0018] S5, open the purge pipe valve of the pressure plugging device, close the vent pipe valve, connect the purge pipe to nitrogen or other inert gas; fix the gas leakage pressure plugging device on the equipment to be plugged, open nitrogen or other inert gas, use nitrogen to purge the pressure plugging device, and then open 1 / 3 of the vent pipe valve;

[0019] S6, use an oxygen alarm to detect the oxygen content in the gas released from the release pipe of the pressure plugging device to ensure that the oxygen content in the released gas is 0ppm;

[0020] S7, nitrogen is continuously inflated into the pressure plugging device to ensure that the pressure inside the pressure plugging device is positive and the gas pressure in the gas pipeline or equipment is kept positive;

[0021] S8, welding the pressurized plugging device to the gas equipment using electric welding;

[0022] S9, after the gas leakage pressure sealing device is welded on the gas pipeline and equipment, the two valves are closed to solve the gas leakage problem.

[0023] Optionally, in step S4, industrial glue or wood chips may be used to seal the leak point according to the shape of the leak point to reduce the amount of gas leakage.

[0024] Optionally, during step S1 to step S7, the safety of the operating area is ensured to avoid sparks or open flames to prevent gas ignition or explosion.

[0025] The beneficial effects of the present invention are as follows: when gas pipelines, equipment and facilities are perforated or cracked and gas leaks occur, the gas pipelines, equipment and facilities are sealed under pressure without stopping production, eliminating the safety risk of gas leakage, ensuring personnel safety, and not affecting the production efficiency of enterprises due to gas leakage in gas pipelines, equipment and facilities. Compared with the original gas pipeline, equipment and facility perforation, cracking and gas leakage treatment solution, the gas leakage point is sealed under pressure without stopping production, which not only ensures the continuity of production, but also solves the risks of gas poisoning, fire and explosion caused by untimely gas leakage treatment.

[0026] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure numerals: gas pipeline 1, sealing box 2, closing flange 3, purge ball valve 4, purge port 5, purge pipe 6, vent pipe 7, vent port 8, vent ball valve 9, gas pipeline leakage point 10. DETAILED DESCRIPTION

[0030] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0032] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] like Figure 1 As shown, a gas leakage pressure plugging device of the present invention is mainly composed of a gas pipeline 1, a sealing box 2, a closing flange 3, a purge ball valve 4, a purge port 5, a purge pipe 6, a vent pipe 7, a vent port 8 and a vent ball valve 9.

[0034] Gas pipeline 1: The gas pipeline where leakage occurred.

[0035] Sealing box 2: It is a hollow shell structure, and its shape is highly matched and fits with the outer wall shape of the gas pipeline 1 or the equipment. The side facing the gas pipeline 1 is an opening, and the opening covers the periphery of the gas pipeline leakage point 10 to seal the leakage point.

[0036] The closing flange 3 is arranged at the other end of the opening of the sealing box 2 and is used to connect the purge pipe 6 and the vent pipe 7.

[0037] Purge port 5 and purge pipe 6 : the purge port 5 is arranged on the closed flange 3 , the purge pipe 6 is connected to the purge port 5 , and is connected to a nitrogen or inert gas source for purging the gas in the sealed box 2 .

[0038] The vent 8 and the vent pipe 7: The vent 8 is also provided on the closed flange 3 , and the vent pipe 7 is connected to the vent 8 for discharging the gas in the sealing box 2 .

[0039] The purge ball valve 4 and the relief ball valve 9 are respectively arranged on the purge port 5 and the relief port 8, and are used to control the on-off of the purge pipe 6 and the relief pipe 7.

[0040] Material selection: The sealing box 2 is made of corrosion-resistant metal material to adapt to the corrosive environment of the gas pipeline.

[0041] Implementation steps:

[0042] In combination with the above device, a method for sealing gas leakage under pressure of the present invention specifically comprises the following steps:

[0043] S1, on-site inspection to confirm the gas leakage point 10, observe the damage shape of the equipment at the leakage point, the size and pressure of the gas leakage, etc.;

[0044] S2, use a thickness gauge to detect the thickness of the equipment at the leakage point to ensure that the thickness of the equipment around the leakage point is not less than the thickness required for welding;

[0045] S3, measure the size of the leak point that needs to be plugged, and make a pressure plugging device according to the shape of the equipment;

[0046] S4, the operator chooses to wear air respirators, gas alarms and other safety protection equipment according to the amount of gas leakage on site; according to the shape of the leakage point 10, the leakage point can be temporarily blocked with industrial glue or wood chips to reduce the amount of gas leakage;

[0047] S5, open the purge ball valve 4 of the pressure plugging device, close the release ball valve 9, connect the purge pipe 6 to the nitrogen or other inert gas source, fix the gas leakage pressure plugging device on the equipment to be plugged, open the nitrogen or other inert gas, purge the sealing box 2, and then open 1 / 3 of the release ball valve 9;

[0048] S6, using an oxygen alarm to detect the oxygen content in the gas released from the release pipe 7 of the sealing box 2 to ensure that the oxygen content in the released gas is 0 ppm;

[0049] S7, nitrogen is continuously inflated into the sealed box 2 to maintain the pressure inside the sealed box 2 at a positive pressure, and at the same time ensures that the gas pressure in the gas pipeline 1 or the equipment also maintains a positive pressure;

[0050] S8, welding the pressure plugging device to the gas pipeline 1 or the equipment by electric welding;

[0051] S9, after welding is completed, close the purge ball valve 4 and the vent ball valve 9 to complete the plugging of gas leakage.

[0052] In this embodiment, during steps S1 to S7, the safety of the operating area is ensured, and sparks or open flames are strictly prohibited to prevent gas ignition or explosion.

[0053] Since this design is based on the gas leakage plugging under pressure, the gas leakage point can be plugged without interrupting production and without purging the gas pipeline under pressure, and it will not affect the subsequent use or leave any safety hazards, so the production continuity can be guaranteed.

[0054] This design has been successfully used in the pressure-sealing of gas leaks in gas pipelines and equipment perforations and cracks in the coking, ironmaking, and steelmaking areas of Chongqing Iron and Steel Co., Ltd.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A gas leakage plugging device under pressure, characterized in that: It includes a sealing box, and a purge pipe and a vent pipe communicated with the inside of the sealing box; The sealing box is a hollow shell structure, which matches and fits the outer wall shape of the gas pipeline or equipment, and has an opening on the side facing the gas pipeline or equipment, which covers the periphery of the leakage point of the gas pipeline or equipment to seal the leakage point; The other end of the sealing box opening is provided with a closed flange, on which a purge port and a vent are provided, a purge pipe is connected to the purge port and is connected to a nitrogen or inert gas source; a vent pipe is connected to the vent for discharging gas; The purge port and the relief port are respectively provided with a purge ball valve and a relief ball valve.

2. A gas leakage plugging device under pressure according to claim 1, characterized in that: The sealing box is made of corrosion-resistant metal material.

3. A method for sealing gas leakage under pressure, using a gas leakage sealing device under pressure as claimed in any one of claims 1 or 2, characterized in that: The following steps are involved: S1, on-site inspection to confirm the gas leakage point, observe the damage shape of the equipment at the leakage point, the size and pressure of the gas leakage, etc.; S2, use a thickness gauge to detect the thickness of the equipment at the leakage point to ensure that the thickness of the equipment around the leakage point is not less than the thickness required for welding; S3, measure the size of the leak point that needs to be plugged, and make a pressure plugging device according to the shape of the equipment; S4, operators should choose to wear air respirators and gas alarms according to the amount of gas leakage on site and take relevant safety measures; S5, open the purge pipe valve of the pressure plugging device, close the vent pipe valve, connect the purge pipe to nitrogen or other inert gas; fix the gas leakage pressure plugging device on the equipment to be plugged, open nitrogen or other inert gas, use nitrogen to purge the pressure plugging device, and then open 1 / 3 of the vent pipe valve; S6, use an oxygen alarm to detect the oxygen content in the gas released from the release pipe of the pressure plugging device to ensure that the oxygen content in the released gas is 0ppm; S7, nitrogen is continuously inflated into the pressure plugging device to ensure that the pressure inside the pressure plugging device is positive and the gas pressure in the gas pipeline or equipment is kept positive; S8, welding the pressurized plugging device to the gas equipment using electric welding; S9, after the gas leakage pressure sealing device is welded on the gas pipeline and equipment, the two valves are closed to solve the gas leakage problem.

4. A method for plugging gas leakage under pressure according to claim 3, characterized in that: In step S4, industrial glue or wood chips are used to seal the leak point according to its shape to reduce the amount of gas leakage.

5. A method for plugging gas leakage under pressure according to claim 3, characterized in that: During step S1 to step S7, the safety of the operation area is ensured to avoid sparks or open flames to prevent gas ignition or explosion.

Images