On-line inert gas diluting device for flammable gas pipeline flange leakage point

Abstract

The utility model relates to the technical field of chemical production, in particular to a flammable gas pipeline flange leakage point online inert gas dilution device which comprises a flammable gas pipeline, two flange plates are arranged at the joint of the flammable gas pipeline, and the leakage point connected with the two flange plates is sealed through an upper shell and a lower shell which are of an arc-shaped structure. Gas conveying pipes of arc-shaped structures are installed in the upper shell and the lower shell, a plurality of gas outlet holes are formed in the connecting positions, facing the flange plate, of the gas conveying pipes in the circumferential direction, an inert gas inlet pipeline is arranged on one side of the flange plate, and the inert gas inlet pipeline is connected with the gas conveying pipes through gas pipes; the detection chamber can accurately detect whether combustible gas leaks at the joint of the two flange plates through the combustible gas detector, and the controller controls the opening of the first electromagnetic valve and the second electromagnetic valve, so that inert gas is injected to the joint of the flange plates, the concentration of the combustible gas leaked at the joint is diluted, and the leakage of the combustible gas at the joint is reduced. Combustible gas is effectively prevented from being gathered, and fire disasters are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, and particularly relates to an on-line inert gas dilution device for leakage points of flanges of combustible gas pipelines. Background Art

[0002] In the pipelines of chemical equipment for transporting combustible gas, flange connections are usually adopted. As a common detachable connection method, the flange has the advantages of facilitating the installation, maintenance and overhaul of equipment. Two flange plates are connected together by bolts to form a sealing structure. However, due to reasons such as the corrosion of the transported medium and the vibration of the pipeline, leakage points are likely to occur. When the transported medium is a combustible gas, the combustible gas flowing out at high speed is extremely likely to catch fire due to static electricity, open fire or a relatively high operating temperature, seriously endangering the stable operation of the chemical plant and the personal safety of firefighters. Therefore, for the stable operation of chemical production, it is necessary to dilute the leakage point part to avoid the accumulation of combustible gas and cause a fire. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides an on-line inert gas dilution device for leakage points of flanges of combustible gas pipelines to solve the problem that combustible gas leaks and accumulates at the connection of the flange in the above-mentioned background art, thus causing a fire.

[0004] To achieve the above technical purpose, the utility model proposes the following technical solution: An on-line inert gas dilution device for leakage points of flanges of combustible gas pipelines includes a combustible gas pipeline. At the connection of the combustible gas pipeline, there are two flange plates. The leakage point where the two flange plates are connected is sealed by an upper shell and a lower shell with an arc structure. Arc-shaped gas pipelines are installed in both the upper shell and the lower shell. A plurality of air outlet holes are circumferentially opened on the gas pipeline facing the connection of the flange plates. On one side of the flange plate, there is an inert gas inlet pipeline. The inert gas inlet pipeline and the gas pipeline are both connected by a connecting pipe. The two flange plates and the upper shell and the lower shell form a closed detection chamber. An exhaust pipeline communicating with the detection chamber is opened on the upper shell or the lower shell.

[0005] Further, the upper shell and the lower shell are connected by fixing bolts, and the contact between the upper shell and the lower shell and the contact between the upper shell and the lower shell and the flange plate are sealed by a sealing gasket.

[0006] Further, a controller is provided above the combustible gas pipeline, and a combustible gas detector is provided in the detection chamber. The output end of the combustible gas detector is electrically connected to the input end of the controller.

[0007] Further, a first solenoid valve is provided on the inert gas inlet pipeline, and a second solenoid valve is provided on the exhaust pipeline. The input ends of the first solenoid valve and the second solenoid valve are both connected to the output end of the controller.

[0008] Further, an alarm is provided on the controller.

[0009] Further, both the upper housing and the lower housing are made of fire-resistant plate members.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: through the detection chamber, the present utility model can accurately detect whether there is combustible gas leakage at the connection of the two flange plates by means of a combustible gas detector, and the controller controls the opening of the first solenoid valve and the second solenoid valve, so as to inject inert gas to the connection of the flange plates, dilute the concentration of the combustible gas leaking at the connection, effectively avoid the accumulation of combustible gas, and reduce the occurrence of fires; the diluted mixed gas will be discharged to a suitable place through the exhaust pipeline, preventing direct discharge from affecting the atmospheric environment; the upper housing and the lower housing of the present utility model are connected by fixing bolts, which facilitates installation, later maintenance, disassembly and other work. Description of the Drawings

[0011] Figure 1 is the overall sectional structure schematic diagram of the present utility model;

[0012] Figure 2 is the three-dimensional structure schematic diagram of the present utility model.

[0013] In the figure, 1, combustible gas pipeline; 2, flange plate; 3, upper housing; 4, lower housing; 5, gas transmission pipe; 6, air outlet hole; 7, inert gas inlet pipeline; 8, pipeline; 9, detection chamber; 10, exhaust pipeline; 11, fixing bolt; 12, controller; 13, combustible gas detector; 14, first solenoid valve; 15, second solenoid valve; 16, alarm. Detailed Embodiments

[0014] The following are specific embodiments of the present utility model, and the technical solutions of the present utility model are further described in conjunction with the drawings, but the present utility model is not limited to these embodiments.

[0015] As Figure 1 and 2 shown, the present utility model provides an on-line inert gas dilution device for the leakage point of the flange of a combustible gas pipeline, including a combustible gas pipeline 1, two flange plates 2 are provided at the connection of the combustible gas pipeline 1, the leakage point where the two flange plates 2 are connected is sealed by an upper housing 3 and a lower housing 4 with an arc-shaped structure, arc-shaped gas transmission pipes 5 are installed in both the upper housing 3 and the lower housing 4, a plurality of air outlet holes 6 are circumferentially opened on the gas transmission pipe 5 facing the connection of the flange plates 2, an inert gas inlet pipeline 7 is provided on one side of the flange plate 2, the inert gas inlet pipeline 7 and the gas transmission pipe 5 are both connected by a connecting pipe 8, a closed detection chamber 9 is formed by the two flange plates 2, the upper housing 3 and the lower housing 4, and an exhaust pipeline 10 communicating with the detection chamber 9 is opened on the upper housing 3 or the lower housing 4.

[0016] As Figure 1 and 2 shown, the upper housing 3 and the lower housing 4 seal the detection chamber 9. Inert gas is input into the two gas pipelines 5 through the inert gas inlet pipeline 7. The two arc-shaped gas pipelines 5 can comprehensively dilute the possible leakage points at the connection of the flange 2. The inert gas is sprayed from the air outlet 6 towards the connection of the two flanges 2 to dilute the combustible gas at the connection. The diluted mixed gas is finally discharged from the exhaust pipeline 10 in the detection chamber 9; in this embodiment, nitrogen can be selected as the inert gas to dilute the leaked combustible gas.

[0017] The upper housing 3 and the lower housing 4 are connected by fixing bolts 11, and the contact surfaces between the upper housing 3 and the lower housing 4 and the contact surfaces between the upper housing 3 and the lower housing 4 and the flange 2 are sealed by sealing gaskets.

[0018] As Figure 1 shown, connecting the upper housing 3 and the lower housing 4 by the fixing bolts 11 can facilitate installation, later maintenance, disassembly and other work. Sealing with a gasket can improve the sealing performance of the detection chamber 9, prevent the leakage of combustible gas, and at the same time facilitate the accurate detection of trace leakage by the combustible gas detector 13.

[0019] A controller 12 is provided above the combustible gas pipeline 1. The controller 12 is a PLC controller. A combustible gas detector 13 is provided in the detection chamber 9. A first solenoid valve 14 is provided on the inert gas inlet pipeline 7, and a second solenoid valve 15 is provided on the exhaust pipeline 10. The output end of the combustible gas detector 13 is electrically connected to the input end of the controller 12, and the input ends of the first solenoid valve 14 and the second solenoid valve 15 are both connected to the output end of the controller 12.

[0020] As Figure 1 shown, the detection chamber 9 in the closed space can conveniently detect whether there is combustible gas leakage at the connection of the two flanges 2 through the combustible gas detector 13. If combustible gas is detected, the controller 12 controls the first solenoid valve 14 and the second solenoid valve 15 to open. The first solenoid valve 14 opens to input inert gas into the gas pipeline 5. The inert gas sprays towards the connection of the flange 2 to dilute the combustible gas at the leakage point. The generated mixed gas after dilution is discharged from the exhaust pipeline 10. For combustible gas, such as methane, if it is directly discharged into the air after dilution, it may cause the greenhouse effect. Therefore, the mixed gas can be transported through the exhaust pipeline 10 to a recoverable device for treatment.

[0021] An alarm 16 is provided on the controller 12.

[0022] As Figure 1As shown, when the combustible gas detector 13 transmits the signal of detected combustible gas to the controller 12, the controller 12 controls the alarm 17 to sound, prompting the staff that there is a combustible gas leak, which is convenient for the staff to timely discover and handle the leak point.

[0023] Both the upper shell 3 and the lower shell 4 are made of fire-resistant plate members.

[0024] As Figure 2 shown, the fire-resistant plate member has excellent electrical insulation, so it can prevent static electricity from being generated when the combustible gas contacts the upper shell 3 or the lower shell 4.

[0025] Principle of use: When there is a leak at the connection of the two flange plates 2, the leaked combustible gas is in the detection chamber 9. The combustible gas detector 13 detects the leak. The combustible gas detector 13 transmits the signal to the controller 12. The controller 12 will control the first solenoid valve 14 and the second solenoid valve 15 to open. When the first solenoid valve 14 opens, the inert gas inlet pipeline 7 conveys inert gas into the gas pipeline 5. The inert gas is evenly sprayed towards the connection of the two flange plates 2 to dilute the combustible gas ejected from the leak point at the connection. At the same time, when the second solenoid valve 15 opens, the mixed gas of inert gas and combustible gas can be discharged along the exhaust pipeline 10 into the mixed gas treatment device for treatment, so as to avoid the situation of directly discharging and increasing the greenhouse effect. At the same time, the combustible gas detector 13 transmits the detected combustible gas signal to the controller 12. The controller 12 controls the alarm 16 to give an alarm, reminding the staff of the combustible gas leak and making timely leak repair measures. It can be disassembled by the fixing bolts 11, which is convenient for leak repair and other treatments at the leak point.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An on-line inert gas dilution device for leakage points of flanges in a combustible gas pipeline, comprising a combustible gas pipeline (1), and two flange plates (2) are provided at the connection of the combustible gas pipeline (1), and it is characterized in that: The leakage point where the two flanges (2) are connected is sealed by the upper housing (3) and the lower housing (4) with an arc-shaped structure. Arc-shaped gas pipelines (5) are installed inside both the upper housing (3) and the lower housing (4). A number of air outlet holes (6) are circumferentially formed on the gas pipeline (5) facing the connection of the flanges (2). An inert gas inlet pipeline (7) is provided on one side of the flange (2). The inert gas inlet pipeline (7) and the gas pipeline (5) are both connected through a connecting pipe (8). The two flanges (2), the upper housing (3), and the lower housing (4) form a sealed detection chamber (9). An exhaust pipeline (10) communicating with the detection chamber (9) is formed on the upper housing (3) or the lower housing (4).

2. The on-line inert gas dilution device for leakage points of flanges of combustible gas pipelines according to claim 1, wherein: The upper housing (3) and the lower housing (4) are connected by fixing bolts (11), and the contact points between the upper housing (3) and the lower housing (4), and the contact points between the upper housing (3) and the lower housing (4) and the flanges (2) are sealed by sealing gaskets.

3. An on-line inert gas dilution device for leakage points of flanges in a combustible gas pipeline according to claim 1, characterized in that: A controller (12) is provided above the combustible gas pipeline (1). A combustible gas detector (13) is arranged inside the detection chamber (9). A first solenoid valve (14) is arranged on the inert gas inlet pipeline (7), and a second solenoid valve (15) is arranged on the exhaust pipeline (10). The output end of the combustible gas detector (13) is electrically connected to the input end of the controller (12). The input ends of the first solenoid valve (14) and the second solenoid valve (15) are both connected to the output end of the controller (12).

4. An on-line inert gas dilution device for leakage points of a combustible gas pipeline flange according to claim 3, characterized in that: An alarm (16) is arranged on the controller (12).

5. An on-line inert gas dilution device for leakage points of a combustible gas pipeline flange according to claim 1, characterized in that: Both the upper housing (3) and the lower housing (4) are made of fire-resistant plate members.

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