Flange joint inert gas protection device

Abstract

The utility model discloses an inert gas protection device for a flange joint. The inert gas protection device comprises a protection cover, a monitoring assembly and a gas conveying assembly. The protective cover is connected with the connecting part of the flange and is used for sealing the connecting part; the monitoring assembly comprises a flame detection unit and a pressure detection unit, the flame detection unit is used for detecting whether flames exist at the connecting part or not and giving an alarm, and the pressure detection unit is used for detecting the pressure in the protective cover; the gas conveying assembly is communicated with the protective cover and used for conveying inert gas into the protective cover so as to extinguish flames. The sealing device is arranged at the flange connecting position, a closed space is formed in the flange connecting position, media are isolated from oxygen through inert gas, and flammable and explosive media are prevented from being burnt after leaking.

Description

Technical Field

[0001] The invention belongs to the field of petrochemical pipeline accessories, and in particular relates to an inert gas protection device for flange connections. Background Art

[0002] In petrochemical refineries, liquid or gaseous media are mostly transported through pipelines, and the media in the pipelines are mostly high-temperature, flammable and explosive chemical products. Pipelines are usually connected by flanges. The sealing of the flanges gradually weakens after long-term use, and there is a risk of leakage of the media in the pipes. When the media leaks, due to the high temperature and flammable and explosive properties of the media, it is very easy for the flange connection to catch fire when it comes into contact with air, and in severe cases, it may cause an explosion.

[0003] Inert gases are physically and chemically inactive gases with a stable electronic configuration. Because they generally do not react with other elements at room temperature and pressure, they are often used to create an oxygen-free environment to prevent fires and explosions. However, isolating the high-temperature medium at flange joints from oxygen is a challenge, and currently there is no effective device to achieve this. Utility Model Content

[0004] To solve the above problems, the present application proposes an inert gas protection device for flange connection, comprising a protective cover, a monitoring component, and a gas delivery component;

[0005] The protective cover includes at least two cover bodies, which are connected along the circumference of the flanges and cover the outside of the connection parts of the two flanges to seal the connection parts;

[0006] The monitoring component includes a flame detection unit and a pressure detection unit. The flame detection unit is used to detect whether there is flame at the connection part and issue an alarm. The pressure detection unit is used to detect the pressure inside the protective cover.

[0007] The gas delivery assembly is connected to the protective cover and is used to deliver inert gas into the protective cover to extinguish the flame. Furthermore, the protective cover also includes a pressure relief component and a sealing component;

[0008] The pressure relief piece is provided on the cover body and is used to release the pressure inside the cover body;

[0009] The sealing member is arranged at the joint of adjacent cover bodies and is used for sealing between the pipeline and the protective cover.

[0010] Maintaining the sealing of the protective cover can make it more difficult for the inert gas to leak, thereby forming an inert gas environment and isolating the medium from contact with oxygen.

[0011] Furthermore, the gas delivery assembly includes a gas delivery pipe, a regulating valve, a pump, and an inert gas source;

[0012] The gas pipeline connects the inert gas source and the protective cover to input the gas in the inert gas source into the protective cover. The gas pipeline is equipped with a pump and a regulating valve.

[0013] The regulating valve is used to adjust the inert gas delivery volume;

[0014] Pumps are used to provide power for inert gas delivery.

[0015] Furthermore, the flame detection unit includes a flame detector, and the flame detector includes a probe;

[0016] The pressure detection unit includes a pressure sensor, and the pressure sensor includes a resistance strain gauge;

[0017] The probe and the resistance strain gauge are both placed in the protective cover.

[0018] Furthermore, the pressure relief component includes a bursting disc, which is fixedly connected to the cover body. When the pressure in the protective cover is too high, the bursting disc breaks to discharge the pressure in the protective cover.

[0019] Furthermore, the sealing component includes a sealing groove, sealant, and bolts. The sealing groove is arranged along the edge of the cover body, and the sealing groove is connected to a glue injection hole. Preferably, the glue injection hole is provided with a sealing nut, and the sealing groove has sealant injected along the glue injection hole; the cover bodies are fixed by bolts, and high-temperature sealant is injected into the sealing groove through the glue injection hole to form a good seal.

[0020] Furthermore, the gas pipe and the protective cover are sealed and connected, and the gas pipe is set to pass through the protective cover, including an external pipe and an internal pipe; the external pipe is connected to the regulating valve, pump, and inert gas source in sequence in the direction away from the protective cover, and the internal pipe is set along the flange direction, and a nozzle is provided on the pipe wall of the internal pipe.

[0021] Alternatively, a cavity is provided inside the protective cover, a gas pipe is connected to the cavity, a nozzle distributed in a circumferential array is provided in the cavity relative to the flange, and the gas pipe inputs inert gas into the cavity and sprays it toward the flange through the nozzle.

[0022] Alternatively, the protective cover includes two cover bodies, which are symmetrically arranged. The gas pipe is divided into two gas branches at the regulating valve. The two gas branches pass through the two cover bodies respectively and are sealed and connected. One end of the gas branch pipe entering the cover body extends along the inner wall of the cover to form two symmetrical semicircular tubes, and the semicircular tubes are provided with multiple nozzles.

[0023] Furthermore, a plurality of nozzles are evenly distributed along the flange, and the nozzles face toward the flange.

[0024] Furthermore, it also includes a controller, and the flame detection unit, pressure detection unit, pump, and regulating valve are all connected to the controller. The controller is also connected to an alarm. When the flame detection unit detects a fire, the controller starts the pump and regulating valve to spray inert gas and sounds an alarm.

[0025] The beneficial effects of the present invention are:

[0026] (1) The utility model is installed at the flange connection and forms a closed space there, isolating the medium from oxygen with inert gas to prevent combustion of flammable and explosive media after leakage.

[0027] (2) The protective cover of the utility model can prevent the burning medium from spreading outward, thus avoiding further spread of the fire and reducing losses.

[0028] (3) The utility model has the effect of extinguishing the fire of the medium that has already burned. The oxygen is gradually discharged through the inert gas, and the flame will gradually go out.

[0029] (4) The utility model can reduce the corrosion of the flange caused by environmental factors and extend the service life of the flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation on the present invention.

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0032] Figure 2 This is an internal cross-sectional view of an embodiment of the present utility model;

[0033] Figure 3 This is a bottom sectional view of an embodiment of the utility model;

[0034] Figure 4 This is a cross-sectional view of another embodiment of the present invention;

[0035] Figure 5 This is an exploded view of the structure of another embodiment of the present utility model;

[0036] In the accompanying drawings: 1-protective cover, 11-cover body, 12-pressure relief part, 13-seal, 131-seal groove, 132-bolt, 133-glue injection hole, 14-pressure relief pipe, 2-gas delivery assembly, 21-gas pipe, 211-gas branch pipe, 212-semicircular pipe, 213-external pipe, 214-inner pipe, 22-regulating valve, 23-pump, 24-cavity, 25-nozzle, 31-probe, 32-resistance strain gauge. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0039] In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0042] An inert gas protection device for flange connection, comprising a protection cover 1, a monitoring component, and a gas delivery component 2;

[0043] The protective cover 1 includes at least two cover bodies 11, which are connected along the circumference of the flanges and cover the outside of the connection part of the two flanges to seal the connection part;

[0044] The monitoring component includes a flame detection unit and a pressure detection unit. The flame detection unit is used to detect whether there is flame at the connection part and issue an alarm. The pressure detection unit is used to detect the pressure inside the protective cover 1.

[0045] The gas delivery assembly 2 is in communication with the protective cover 1, and is used to deliver inert gas into the protective cover 1 to extinguish the flame.

[0046] In one embodiment, the protective cover 1 further comprises a pressure relief device 12 and a sealing device 13.

[0047] The pressure relief device 12 is arranged on the cover body 11, and is used to release the pressure in the cover body 11.

[0048] The sealing device 13 is arranged on the cover body 11 and the connection between the cover body 11 and the pipeline, and is used to seal the pipeline and the protective cover 1.

[0049] In one embodiment, the gas delivery assembly 2 comprises a gas delivery pipe 21, a regulating valve 22, a pump 23, and an inert gas source.

[0050] The gas delivery pipe 21 is in communication with the inert gas source and the protective cover 1, and is used to deliver the gas in the inert gas source into the protective cover 1. The gas delivery pipe 21 is provided with the pump 23 and the regulating valve 22.

[0051] The regulating valve 22 is used to regulate the delivery amount of the inert gas.

[0052] The pump 23 is used to provide power for the delivery of the inert gas.

[0053] In one embodiment, the flame detection unit comprises a flame detector, and the flame detector comprises a probe 31.

[0054] The pressure detection unit comprises a pressure sensor, and the pressure sensor comprises a resistance strain gauge 32.

[0055] The probe 31 and the resistance strain gauge 32 are both arranged in the protective cover 1.

[0056] In one embodiment, the pressure relief device 12 comprises a bursting disc, and the bursting disc is fixedly connected with the cover body 11. When the pressure in the protective cover 1 is too large, the bursting disc breaks to release the pressure in the protective cover 1.

[0057] In one embodiment, the sealing device 13 comprises a sealing groove 131, sealing glue, and a bolt 132. The sealing groove 131 is arranged along the edge of the cover body 11, and is provided with a glue injection hole 133. Preferably, the glue injection hole 133 is provided with a sealing nut. The sealing groove 131 is filled with the sealing glue injected through the glue injection hole 133. The cover body 11 is fixed by the bolt 132, and the high-temperature sealing glue is injected into the sealing groove 131 through the glue injection hole 133 to form a good seal.

[0058] In a specific embodiment, the gas pipe 21 is sealed and connected to the protective cover 1. The gas pipe 21 is set to pass through the protective cover 1 and includes an external pipe 213 and an internal pipe 214. The external pipe 213 is connected to the regulating valve 22, the pump 23, and the inert gas source in sequence in the direction away from the protective cover 1. The internal pipe 214 is set along the flange direction, and a nozzle 25 is provided on the pipe wall of the internal pipe 214.

[0059] In another specific embodiment, a cavity 24 is provided on the inner side of the protective cover 1, and the gas pipe 21 is connected to the cavity 24. The cavity 24 is provided with nozzles 25 distributed in a circumferential array relative to the flange. A pressure relief pipe 14 is connected between the inner wall of the cavity 24 and the cover body 11. The pressure relief pipe 14 is connected to the pressure relief part 12. The gas pipe 21 inputs inert gas into the cavity 24, and the inert gas in the cavity 24 is sprayed toward the flange through the nozzle 25. The cavity 24 is not connected to the pressure relief part 12. When the pressure at the flange is too high, the gas flows to the pressure relief part 12 through the pressure relief pipe 14, and the pressure relief part 12 relieves the pressure.

[0060] In another embodiment, the protective cover 1 includes two cover bodies 11, which are symmetrically arranged. The gas supply pipe 21 is divided into two gas supply branches 211 at the regulating valve 22. The two gas supply branches 211 respectively pass through the two cover bodies 11 and are sealed and connected. One end of the gas supply branch 211 entering the cover body 11 extends along the inner wall of the cover body 11 to form two symmetrical semicircular tubes 212, and the semicircular tubes 212 are provided with multiple nozzles 25.

[0061] In a specific embodiment, a plurality of nozzles 25 are evenly distributed along the flange, and the nozzles 25 face toward the flange.

[0062] In a specific embodiment, a controller is also included. The flame detection unit, the pressure detection unit, the pump 23, and the regulating valve 22 are all connected to the controller. The controller is also connected to an alarm. When the flame detection unit detects a fire, the controller starts the pump 23 and the regulating valve 22 to spray inert gas and sounds an alarm.

[0063] During use, the cover body 11 is placed on the flange connection part, and the cover bodies 11 are connected and fixed by bolts 132. The hot sealant is injected into the sealing groove 131 through the glue injection hole 133 to complete the sealing. The pump 23 is turned on, and the inert gas is passed from the inert gas source along the gas pipe 21 through the regulating valve 22 into the protective cover 1, thereby forming an inert gas environment to isolate oxygen. When the pressure sensor reaches the set pressure, the regulating valve 22 and the pump 23 are closed and no more inert gas is supplied. The set pressure is lower than the pressure that the bursting disc can withstand.

[0064] If the leakage is serious and the medium continues to seep out, the pressure in the protective cover 1 will increase accordingly and reach the upper limit of the bursting disc. The bursting disc will rupture and allow the gas to flow out to reduce the pressure and prevent explosion. At this time, the medium breaks through the inert gas and contacts with oxygen, causing fire. At this time, the flame detector detects the flame and then displays the fire or the controller controls the alarm to sound an alarm. At this time, the staff will close the medium flow at the leakage flange, increase the output of the regulating valve 22 at the source, and increase the output power of the pump 23 to make more inert gas rush into the protective cover 1, squeeze the oxygen out of the protective cover or suppress the medium, gradually extinguish the flame, and reduce the inert gas input after the flame is extinguished. After the pressure stabilizes, the staff will take corresponding maintenance measures according to the degree of leakage.

[0065] Anything not described in this utility model can be achieved by adopting or drawing on existing technologies.

[0066] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0067] The above description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims of the present invention.

Claims

1. An inert gas protection device for flange connection, characterized in that: Including protective cover, monitoring components, gas delivery components; The protective cover includes at least two cover bodies, which are connected along the circumference of the flanges and cover the outside of the connection part of the two flanges to seal the connection part; The monitoring assembly includes a flame detection unit and a pressure detection unit. The flame detection unit is used to detect whether there is a flame at the connection part and issue an alarm. The pressure detection unit is used to detect the pressure inside the protective cover. The gas delivery component is communicated with the protective cover and is used for delivering inert gas into the protective cover to extinguish the flame.

2. The inert gas protection device for flange connection according to claim 1, characterized in that: The protective cover also includes a pressure relief member and a sealing member; The pressure relief member is provided on the cover body and is used to release the pressure inside the cover body; The sealing member is arranged at the joint of the adjacent cover bodies and is used for sealing between the pipeline and the protective cover.

3. The inert gas protection device for flange connection according to claim 1, characterized in that: The gas delivery assembly includes a gas delivery pipe, a regulating valve, a pump, and an inert gas source; The gas delivery pipe is connected to the inert gas source and the protective cover to input the gas in the inert gas source into the protective cover. The gas delivery pipe is provided with the pump and the regulating valve; The regulating valve is used to adjust the inert gas delivery amount; The pump is used to provide power for the inert gas delivery.

4. The inert gas protection device for flange connection according to claim 1, characterized in that: The flame detection unit includes a flame detector, and the flame detector includes a probe; The pressure detection unit includes a pressure sensor, and the pressure sensor includes a resistance strain gauge; The probe and the resistance strain gauge are both arranged in the protective cover.

5. The inert gas protection device for flange connection according to claim 2, characterized in that: The pressure relief component includes a bursting disc, which is fixedly connected to the cover body. When the pressure in the protective cover is too high, the bursting disc breaks to discharge the pressure in the protective cover.

6. The inert gas protection device for flange connection according to claim 2, characterized in that: The sealing member includes a sealing groove, sealant and bolts. The sealing groove is provided at the edge of the joint surface of each cover body. The sealing groove is connected to a glue injection hole. The sealing groove has sealant injected along the glue injection hole. The adjacent covers are fixed by the bolts.

7. The inert gas protection device for flange connection according to claim 3, characterized in that: The gas pipe is sealed and connected to the protective cover. The gas pipe runs through the protective cover and includes an external pipe and an internal pipe. The external pipe is sequentially connected to a regulating valve, a pump, and an inert gas source in a direction away from the protective cover. The internal pipe is arranged along the flange, and a nozzle is provided on the wall of the internal pipe.

8. The inert gas protection device for flange connection according to claim 3, characterized in that: A cavity is provided inside the protective cover, the gas pipe is connected to the cavity, and nozzles distributed in a circumferential array are provided in the cavity relative to the flange. The gas pipe inputs inert gas into the cavity and sprays it toward the flange through the nozzles.

9. The inert gas protection device for flange connection according to claim 3, characterized in that: The protective cover includes two cover bodies, which are symmetrically arranged. The gas pipe is divided into two gas branch pipes from the regulating valve. The two gas branch pipes respectively pass through the two cover bodies and are sealed and connected. One end of the gas branch pipe entering the cover body extends along the inner wall of the cover to form two symmetrical semicircular tubes, and the semicircular tubes are provided with multiple nozzles.

10. The inert gas protection device for flange connection according to claim 3, characterized in that: It also includes a controller, and the flame detection unit, the pressure detection unit, the pump, and the regulating valve are all connected to the controller. The controller is also connected to an alarm. When the flame detection unit detects a fire, the controller turns on the pump and the regulating valve to spray inert gas and sounds an alarm.

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