Accident discharge equipment

Abstract

The invention provides accident discharge equipment, and belongs to the field of petrochemical equipment. The accident relief equipment comprises a relief tank, and at least one feeding pipe is connected to the side wall of the relief tank in the tangential direction. A stuffing box type structure is arranged at the other end of the feeding pipe; and a jacket is arranged on the outer wall of the feeding pipe. The side wall of the discharge tank is tangentially connected with the feeding pipe, and the feeding pipe is connected with a reactor or equipment needing pressure relief and release through a stuffing box type structure, so that the impact load of high-flow-speed and high-pressure reaction fluid on the tank body of the discharge tank is reduced, and meanwhile, the load transmitted by a pipeline is reduced; the jacket is arranged on the outer wall of the feeding pipe, and the heating medium is introduced into the annular structure formed by the jacket and the outer wall of the feeding pipe, so that high-temperature and high-pressure fluid can be prevented from being cured and adhered to the inner wall of the feeding pipe due to too low instant temperature when entering the feeding pipe, and additional load generated by curing materials is reduced, so that the maintenance frequency of accident relief equipment is reduced, and the service life of the accident relief equipment is prolonged. And the maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of petrochemical equipment, and in particular relates to an accident discharge device. Background Art

[0002] The purpose of the accident relief equipment is to quickly transport all reaction fluids to the accident relief equipment and terminate the reaction when an accident occurs in the reactor. The inlet of the accident relief equipment will be subjected to the impact and load brought by the high-flow rate and high-pressure reaction fluid, and is the key to the design and manufacture of the entire equipment.

[0003] At present, the structure of the accident discharge equipment of the reactor is mainly that the feed port is a radial structure, and it is connected to the reactor that needs to be discharged through a conventional flange. After multiple accident discharges of the reactor, cracks may appear at the connection between the feed pipe and the discharge tank, and the feed pipe flange may leak. During the inspection and maintenance, the equipment and the pipe port need to be cut and welded, and the inspection and maintenance workload and construction period are long. In addition, in order to be able to withstand all the fluid impact and load effects from the reactor, the existing technology will also continuously thicken the equipment body and the inlet, which will cause a continuous increase in equipment investment. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned difficulties existing in the prior art and to provide an emergency discharge device, which can reduce the impact load of the high-flow rate and high-pressure reaction fluid on the discharge tank body while reducing the load transmitted by the pipeline; and can prevent the high-temperature and high-pressure fluid from entering the feed pipe and the temperature is too low at the moment, so as to solidify and adhere to the inner wall of the feed pipe, thereby reducing the additional load generated by the solidified material, thereby reducing the number of overhauls of the accident discharge equipment and further reducing the maintenance costs.

[0005] The present invention is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides an accident relief device, comprising a relief tank, wherein at least one feed pipe is tangentially connected to a side wall of the relief tank;

[0007] The other end of the feed pipe is provided with a stuffing function structure;

[0008] A jacket is arranged on the outer wall of the feeding pipe.

[0009] A further improvement of the present invention is:

[0010] When multiple feed pipes are provided, the positions and number of the feed pipes are determined by the direction of the pipes connected to the reactor to be released by pressure relief; and / or,

[0011] The outermost busbar of the feed pipe is tangent to the outer wall of the discharge tank body and is smoothly transitioned to be connected.

[0012] A further improvement of the present invention is:

[0013] One end of the feed pipe connected to the discharge tank is cut into a certain arc, and the arc is adapted to the pipe wall of the discharge tank so that it can be tangentially connected to the outer wall of the discharge tank.

[0014] A further improvement of the present invention is:

[0015] The end of the feed pipe away from the discharge tank is connected with a flange, the flange is connected with a matching flange by bolts, and a sealing ring is arranged inside the matching flange.

[0016] A further improvement of the present invention is:

[0017] An annular groove is arranged on the inner wall of the inlet side of the matching flange, and the sealing ring is arranged in the annular groove.

[0018] A further improvement of the present invention is:

[0019] A pressure ring is arranged at the inlet of the matching flange, and the pressure ring fixes the sealing ring through screws and nuts.

[0020] A further improvement of the present invention is:

[0021] The pressure ring is a circular ring structure, the inner wall of which extends axially outward, wherein the end of the extended portion presses the sealing ring, and a side surface of the circular ring structure is in contact with or in contact with the matching flange, and is fixedly connected to the matching flange by screws and nuts.

[0022] A further improvement of the present invention is:

[0023] The sealing ring is a packing made of non-metallic material, and the number of packings is set to 1 to 13 according to sealing requirements.

[0024] A further improvement of the present invention is:

[0025] The two ends of the jacket are respectively provided with a heat medium inlet and a heat medium outlet; and / or,

[0026] The heat medium inlet and the heat medium outlet are respectively communicated with two ends of the heat medium pipeline.

[0027] A further improvement of the present invention is:

[0028] The heat medium pipeline is also communicated with the gas collecting tank or the liquid collecting tank, and a valve is arranged on the pipeline connecting the heat medium pipeline and the gas collecting tank or the liquid collecting tank.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention connects the side wall of the discharge tank to the feed pipe tangentially, and the feed pipe is connected to the reactor or equipment that needs pressure relief through a stuffing function structure, thereby reducing the impact load of the high-flow rate and high-pressure reaction fluid on the discharge tank body and reducing the load transmitted by the pipeline; by arranging a jacket on the outer wall of the feed pipe and introducing heat medium into the annular structure formed by the jacket and the outer wall of the feed pipe, it can be avoided that the high-temperature and high-pressure fluid enters the feed pipe and the temperature is too low at the moment, and solidifies and adheres to the inner wall of the feed pipe, thereby reducing the additional load generated by the solidified material, thereby reducing the number of maintenance times of the accident discharge equipment.

[0031] When the reactor is discharged under accident conditions, the discharge tank mainly bears the impact load of the reaction fluid and the load transmitted from the pipeline. The tangential feeding mainly reduces the impact load of the high-flow rate and high-pressure reaction fluid. The stuffing function structure mainly reduces the load transmitted from the pipeline, that is, by tangentially connecting the side wall of the discharge tank with the feed pipe and connecting the feed pipe with the reactor or equipment that needs to be released through the stuffing function structure, the load of the discharge tank under the reactor accident condition can be reduced to a minimum; by arranging a jacket on the outer wall of the feed pipe as an optimized structure on this basis, when the reaction fluid enters the discharge tank, the temperature decreases due to the pressure reduction, thereby causing the fluid to solidify. The fluid solidification will bring additional load to the feed pipe, increase large pieces of material during discharge, cause poor discharge, and increase the frequency of maintenance. The present invention adopts a jacket heating structure of the feed pipe, which can avoid the problem of fluid solidification, reduce the frequency of maintenance, and thus reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an accident discharge device provided by the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the feed pipe.

[0034] In the figure, 1. discharge tank, 2. feed pipe, 3. jacket, 4. flange, 5. matching flange, 6. sealing ring, 7. pressure ring. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0036] [Example 1]

[0037] The present invention provides an accident discharge device, such as Figure 1 As shown, it includes a discharge tank 1, the top of the discharge tank 1 is provided with a gas phase outlet, and the bottom of the discharge tank 1 is provided with a liquid phase outlet;

[0038] At least one feed pipe 2 is tangentially connected to the side wall of the discharge tank 1, which can reduce the impact and load of the high-velocity, high-pressure reaction fluid on the discharge tank 1 to a certain extent;

[0039] The other end of the feed pipe 2 is provided with a packing function structure, which is connected to the reactor or equipment that needs to be depressurized, thereby greatly reducing the load transmitted by the pipeline;

[0040] A jacket 3 is provided on the outer wall of the feed pipe 2, and an annular structure is formed between the jacket 3 and the outer wall of the feed pipe 2. By introducing heat medium into the annular structure, the high-temperature and high-pressure fluid is prevented from entering the feed pipe 2 and having a low temperature instantly, and solidifying and bonding to the inner wall of the feed pipe 2, thereby reducing the additional load generated by the solidified material, thereby reducing the number of overhauls of the accident discharge equipment and further reducing the maintenance costs.

[0041] When the reactor is discharged under accident conditions, the discharge tank 1 mainly bears the impact load of the reaction fluid and the load transmitted from the pipeline. The tangential feeding mainly reduces the impact load of the high-flow rate and high-pressure reaction fluid. The packing function structure mainly reduces the load transmitted from the pipeline, that is, by tangentially connecting the discharge tank 1 with the feed pipe 2 on the side wall and connecting the feed pipe with the reactor or equipment that needs to be released through the packing function structure, the load of the discharge tank under the reactor accident condition can be reduced to a minimum; by arranging the jacket 3 on the outer wall of the feed pipe 2 as an optimized structure on this basis, when the reaction fluid enters the discharge tank 1, the temperature decreases due to the pressure reduction, thereby causing the fluid to solidify. The fluid solidification will bring additional load to the feed pipe 2, increase large pieces of material during discharge, cause poor discharge, and increase the frequency of maintenance. The present invention adopts the jacket heating structure of the feed pipe 2, which can avoid the problem of fluid solidification, reduce the frequency of maintenance, and thus reduce maintenance costs.

[0042] [Example 2]

[0043] One or more feed pipes 2 are tangentially arranged on the side wall of the discharge tank 1. Specifically, the outermost generatrix of the feed pipe 2 is tangential to the outer wall of the discharge tank body and is smoothly transitioned to be connected.

[0044] like Figure 2 As shown, one end of the feed pipe 2 connected to the discharge tank 1 is cut into a certain arc, which is adapted to the pipe wall of the discharge tank 1 so that it can be tangentially connected to the outer wall of the discharge tank 1.

[0045] When multiple feed pipes 2 are provided, the positions and number of the feed pipes 2 are determined according to the directions of the pipelines connected to the reactors that require pressure relief.

[0046] In the present invention, the feed pipe 2 is arranged tangentially on the side wall of the discharge tank 1. The tangential structure allows the reaction fluid to enter the discharge tank tangentially, and first forms a vortex along the inner wall of the discharge tank. The liquid phase swirls downward due to gravity and is discharged from the bottom outlet; the gas phase swirls upward and is finally discharged from the top outlet. This structure can achieve gas-liquid separation to a certain extent and reduce the entrainment of the gas phase in the liquid phase discharge during radial feeding. At the same time, due to the tangential direction of the fluid feed, the discharge tank is no longer directly subjected to the impact of the high-flow rate and high-pressure fluid. A part of the impact load is released through the vortex of the fluid, thereby reducing the impact of the fluid on the discharge tank and playing a role in reducing equipment investment.

[0047] [Example 3]

[0048] like Figure 2 As shown, a jacket 3 is provided on the outer wall of the feed pipe 2, and an annular structure is formed between the jacket 3 and the outer wall of the feed pipe 2. A heat medium inlet and a heat medium outlet are respectively provided at both ends of the jacket 3. Preferably, the heat medium inlet and the heat medium outlet are both connected to the heat medium pipeline, so that a circulation loop is formed between the annular structure and the heat medium pipeline. The heat medium pipeline is also connected to the gas collecting tank or the liquid collecting tank, and a valve is provided on the pipeline connecting the heat medium pipeline and the gas collecting tank or the liquid collecting tank.

[0049] At the moment when the high-pressure reaction fluid enters the accident discharge equipment, the temperature drops due to the decrease in fluid pressure, which often causes the reaction fluid to solidify and adhere to the inner wall of the feed pipe 2. When the reactor is discharged under accident conditions, it will not only cause poor fluid feeding, but also cause additional loads on the discharge tank, increasing the number of overhauls of the accident discharge equipment. The present invention provides a jacket 3 on the outer wall of the feed pipe 2, and the heat medium enters the annular structure through the heat medium inlet and then flows out from the heat medium outlet, forming a heat medium circulation loop in the jacket. During the reactor discharge condition, a valve is provided on the pipe connecting the heat medium pipeline and the gas collecting tank or the liquid collecting tank, and the heat medium fills the entire annular structure and forms a cycle, preventing the fluid temperature in the feed pipe 2 from being too low and solidifying and adhering to the inner wall of the feed pipe 2, avoiding the additional load caused by the solidified material, thereby reducing the number of overhauls of the accident discharge equipment.

[0050] The heat medium can be in gas phase or liquid phase.

[0051] [Example 4]

[0052] like Figure 2 As shown, a stuffing function structure is provided at the other end of the feed pipe 2, specifically, the other end of the feed pipe 2 is connected with a flange 4, the flange 4 is connected with a matching flange 5 by bolts, a sealing ring 6 is provided in the matching flange 5, and a pressure ring 7 is provided at the inlet of the matching flange 5, and the pressure ring 7 fixes the sealing ring 6 by screws and nuts, wherein the inlet of the matching flange 5 refers to the side away from the flange 4.

[0053] Furthermore, an annular groove is provided on the inner wall of the inlet side of the matching flange 5, and a sealing ring is provided in the annular groove.

[0054] Furthermore, the pressure ring 7 is a circular ring structure, the inner wall of which extends axially outward, wherein the end of the extended portion presses the sealing ring 6, and one side of the circular ring structure is in contact with or in contact with the matching flange 5, and is fixedly connected to the matching flange 5 by screws and nuts.

[0055] The sealing ring 6 can be a packing made of various non-metallic materials. According to the sealing requirements, the number of packings can be set to 1 to 13. According to the material properties and operating temperature, the packing material can be selected from graphite, PTFE, RPTFE, rubber and ceramic fiber.

[0056] The external pipeline connected to the reactor or equipment that needs to be depressurized is extended into the matching flange 5 and tightened. The outer wall of the external pipeline does not contact the inner wall of the pressure ring 7 and the matching flange 5, but only contacts the inner wall of the sealing ring 6, so that there is only radial constraint and sealing between the reactor discharge pipe or the external pipeline and the feed pipe 2, and no axial constraint, which greatly reduces the load transmitted by the pipeline.

[0057] When the high-temperature, high-pressure reaction fluid enters the accident discharge equipment from the external pipeline, the packing function structure can make the external pipeline still maintain free expansion and contraction under the action of fluid pressure, temperature and impact, greatly reducing the pipeline load transmitted to the discharge tank, so that the equipment basically does not bear the load transmitted by the pipeline, which can reduce the equipment investment. At the same time, considering that the normal operating conditions of the accident discharge equipment are the accident conditions of the reactor, when the accident conditions of the reactor are more frequent, the accident discharge equipment may need to consider fatigue analysis. This structure avoids the fatigue load of the accident discharge equipment by greatly reducing the pipeline load transmitted to the equipment.

[0058] The feed pipe of the existing discharge equipment is connected to the external pipeline through a conventional flange. After multiple accidental discharges in the reactor, cracks may appear at the connection between the feed pipe and the discharge tank, and the feed pipe flange may leak. During the inspection and maintenance, the equipment and the pipe mouth need to be cut, welded, etc., and the inspection and maintenance workload and construction period are long. In the present invention, the feed pipe and the external pipeline are connected through a stuffing function structure, which can greatly reduce the load transmitted by the pipeline. The feed pipe and the flange basically do not bear the pipeline load. Therefore, after multiple accidental discharges, cracks will not appear between the feed pipe and the discharge tank. The inspection and maintenance only requires the replacement of the sealing ring, and other parts are not replaced. The workload such as welding can be avoided on site, which can greatly reduce the inspection and maintenance costs and shorten the inspection and maintenance period.

[0059] The present invention reduces the impact load of the high-flow-rate, high-pressure reaction fluid on the discharge tank body and the load transmitted by the pipeline by tangentially connecting the side wall of the discharge tank with the feed pipe, and connecting the feed pipe with the reactor or equipment that needs pressure relief through a stuffing function structure; and by arranging a jacket on the outer wall of the feed pipe and introducing heat medium into the annular structure formed by the jacket and the outer wall of the feed pipe, it can be avoided that the high-temperature and high-pressure fluid enters the feed pipe and the temperature is too low at the moment of solidification and adhesion to the inner wall of the feed pipe, thereby reducing the additional load generated by the solidified material.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0062] The above technical solution is only one implementation mode of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the principles disclosed in the present invention, and it is not limited to the technical solution described in the above specific embodiments of the present invention. Therefore, the above description is only preferred and does not have a restrictive meaning.

Claims

1. An accident release device, characterized in that: It comprises a discharge tank, and at least one feed pipe is tangentially connected to the side wall of the discharge tank; The other end of the feed pipe is provided with a stuffing function structure; A jacket is arranged on the outer wall of the feeding pipe.

2. The accident release equipment according to claim 1, characterized in that: When multiple feed pipes are provided, the positions and number of the feed pipes are determined by the direction of the pipes connected to the reactor to be released by pressure relief; and / or, The outermost busbar of the feed pipe is tangent to the outer wall of the discharge tank body and is smoothly transitioned to be connected.

3. The emergency release equipment according to claim 1 or 2, characterized in that: One end of the feed pipe connected to the discharge tank is cut into a certain arc, and the arc is adapted to the pipe wall of the discharge tank so that it can be tangentially connected to the outer wall of the discharge tank.

4. The emergency release equipment according to claim 3, characterized in that: The end of the feed pipe away from the discharge tank is connected with a flange, the flange is connected with a matching flange by bolts, and a sealing ring is arranged inside the matching flange.

5. The accident release equipment according to claim 4, characterized in that: An annular groove is arranged on the inner wall of the inlet side of the matching flange, and the sealing ring is arranged in the annular groove.

6. The emergency release equipment according to claim 4 or 5, characterized in that: A pressure ring is arranged at the inlet of the matching flange, and the pressure ring fixes the sealing ring through screws and nuts.

7. The emergency release equipment according to claim 6, characterized in that: The pressure ring is a circular ring structure, the inner wall of which extends axially outward, wherein the end of the extended portion presses the sealing ring, and a side surface of the circular ring structure contacts the matching flange and is fixedly connected to the matching flange by screws and nuts.

8. The accident release equipment according to claim 4, characterized in that: The sealing ring is a packing made of non-metallic material, and the number of packings is set to 1 to 13 according to sealing requirements.

9. The emergency release equipment according to claim 1, characterized in that: The two ends of the jacket are respectively provided with a heat medium inlet and a heat medium outlet; and / or, The heat medium inlet and the heat medium outlet are respectively communicated with two ends of the heat medium pipeline.

10. The emergency release equipment according to claim 9, characterized in that: The heat medium pipeline is also communicated with the gas collecting tank or the liquid collecting tank, and a valve is arranged on the pipeline connecting the heat medium pipeline and the gas collecting tank or the liquid collecting tank.

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