Ethylene spherical tank pressure relief control device

Abstract

The utility model provides an ethylene spherical tank pressure relief control device, which relates to the technical field of ethylene storage, and comprises an ethylene spherical tank body, a low-temperature ethylene storage tank and a torch system, two pressure relief ports of the ethylene spherical tank body are fixedly communicated with communicating pipes, the output ends of the two communicating pipes are fixedly communicated with a transverse pipe, and the transverse pipe is communicated with the ethylene spherical tank body. The tops of the two transverse pipes are fixedly communicated with first gate valves through pipelines, the output ends of the two first gate valves are fixedly communicated with second gate valves through pipelines, the low-temperature ethylene storage tank and the torch system are communicated through the adjusting mechanism, when the tank pressure rises, pressure is released preferentially in the mode that the pressure is released to the low-temperature ethylene storage tank, and therefore the pressure of the low-temperature ethylene storage tank is released preferentially. When the low-temperature ethylene storage tank does not have the condition of receiving gas-phase ethylene or the pressure still rises, the regulating valve for discharging to the torch can be opened, and the pressure is reduced by discharging part of ethylene gas.

Description

Technical Field

[0001] The utility model relates to the technical field of ethylene storage, in particular to a pressure relief control device for an ethylene spherical tank. Background Art

[0002] With the vigorous development of the domestic liquefied hydrocarbon industry, the storage and transportation technology of liquefied hydrocarbons has become more and more mature. Because liquefied hydrocarbons are gaseous under normal pressure, they must be stored in cryogenic storage tanks or pressure spherical tanks. The operating pressure of cryogenic ethylene storage tanks is normal pressure, and the operating temperature is -102°C. The operating pressure of cryogenic ethylene spherical tanks is about 1.75MPa, and the operating temperature is -33°C. When the pressure of the ethylene spherical tank increases, it is generally necessary to rely on a refrigerator to control the tank pressure within a reasonable range. The investment and occupation of a separate refrigerator are large. When the pressure continues to rise, the pressure of the spherical tank can only be controlled by opening the local manual valve or until the safety valve is tripped and discharging to the flare.

[0003] However, in the prior art, when the pressure of the ethylene spherical tank rises uncontrollably, the local manual valve cannot be opened and closed in time, which is not conducive to safe operation of personnel. The tripping of the safety valve is a production accident, which is not conducive to safe and smooth production operation. Therefore, it is necessary to propose a new type of ethylene spherical tank pressure relief control device. Utility Model Content

[0004] The purpose of the utility model is to solve the problem in the prior art that when the pressure of the ethylene spherical tank increases uncontrollably, the local manual valve cannot be opened and closed in time and is not conducive to safe operation of personnel, and the tripping of the safety valve is a production accident, which is not conducive to production safety and smooth operation. By adopting a method of remote control and pressure relief to a low-temperature ethylene storage tank, material discharge can be reduced and the safety of personnel operation can be increased, so as to solve the problems raised in the background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an ethylene spherical tank pressure relief control device, comprising: an ethylene spherical tank body, a low-temperature ethylene storage tank and a flare system, the two pressure relief ports of the ethylene spherical tank body are fixedly connected with a connecting pipe, the output ends of the two connecting pipes are fixedly connected with a transverse pipe, the tops of the two transverse pipes are fixedly connected with a first gate valve through a pipeline, the output ends of the two first gate valves are fixedly connected with a second gate valve through a pipeline, the output ends of the second gate valve are fixedly connected with a branch pipe, and the two output ends of the branch pipe are fixedly connected with an adjustment mechanism;

[0006] The regulating mechanism includes four pressure relief pipes, and the output ends of the low-temperature ethylene storage tank and the flare system are respectively fixedly connected to the output ends of two of the four pressure relief pipes, one end of the outer wall of the four pressure relief pipes is fixedly connected to a third gate valve, and an electromagnetic control valve is fixedly connected between the opposite ends of two of the four third gate valves and the opposite ends of the other two through pipelines, and the outer walls of the pipelines of two output ends of the four third gate valves are fixedly connected to a first ball valve.

[0007] Preferably, the outer walls of the four pressure relief pipes are fixedly connected with spare pipes, and second ball valves are fixedly connected between the opposite ends of two of the four spare pipes and between the opposite ends of the other two, so that when the two solenoid control valves are short-circuited due to circuit problems, the second ball valve can be opened to relieve the pressure on the ethylene spherical tank body.

[0008] Preferably, one end of the outer wall of two of the four pressure relief pipes is fixedly connected to a pressure gauge, and the two pressure gauges are respectively fixedly connected to the two ends of the outer wall of the branch pipe, so that when the ethylene spherical tank body is depressurized, the pressure gauge can be used to determine whether the pressure release in each regulating mechanism exceeds the standard.

[0009] Preferably, the outer wall of the pressure relief pipe connected to the flare system is fixedly connected to a sharing pipe, the outer wall of the transverse pipe is fixedly connected to a fourth gate valve through a pipeline, the output end of the fourth gate valve is fixedly connected to a first connecting pipe, and the first connecting pipe is connected to the sharing pipe, so as to prevent the pressure relief efficiency from being low when relying solely on the sharing pipe.

[0010] Preferably, the outer wall of the transverse pipe is fixedly connected to two fifth gate valves through pipelines, the output ends of the two fifth gate valves are fixedly connected to spring safety valves through pipelines, the output ends of the two spring safety valves are fixedly connected to second connecting pipes, and the two second connecting pipes are connected to the sharing pipe, so that when the flare system and the low-temperature ethylene storage tank cannot guarantee the pressure relief effect, the spring safety valve can be used to discharge ethylene to the outside.

[0011] Compared with the prior art, the advantages and positive effects of the utility model are:

[0012] In the utility model, the low-temperature ethylene storage tank and the flare system are respectively connected in the regulating mechanism. When the tank pressure rises, the pressure is relieved preferentially by relieving pressure to the low-temperature ethylene storage tank. When the low-temperature ethylene storage tank is not capable of receiving gaseous ethylene or the pressure is still rising, the regulating valve for discharging to the flare can be opened to reduce the pressure by discharging part of the ethylene gas. This can reduce the emission of ethylene gas to a certain extent, avoid production accidents caused by the tripping of the safety valve, and enrich the means for reducing the pressure of the ethylene spherical tank body.

[0013] 2. In the utility model, a spring safety valve is provided as a pressure relief measure under working conditions where both of the two pressure relief measures are not feasible, thereby ensuring the safe operation of the ethylene spherical tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a main structural stereogram of an ethylene spherical tank pressure relief control device proposed by the utility model;

[0015] Figure 2 This is a structural stereogram of a regulating mechanism in a spherical ethylene tank pressure relief control device proposed by the utility model;

[0016] Figure 3 The utility model provides a stereoscopic diagram of the connection structure between the transverse pipe and the sharing pipe in the ethylene spherical tank pressure relief control device.

[0017] Legend: 1. Ethylene spherical tank body; 2. Low-temperature ethylene storage tank; 3. Flare system; 4. Connecting pipe; 5. Horizontal pipe; 6. First gate valve; 7. Second gate valve; 8. Branch pipe; 9. Adjusting mechanism; 901. Pressure relief pipe; 902. Third gate valve; 903. Solenoid control valve; 904. First ball valve; 905. Spare pipe; 906. Second ball valve; 907. Pressure instrument; 10. Sharing pipe; 11. Fourth gate valve; 12. First connecting pipe; 13. Fifth gate valve; 14. Spring safety valve; 15. Second connecting pipe. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] 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 than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0020] Embodiment 1, as Figure 1-Figure 3As shown, the utility model provides an ethylene spherical tank pressure relief control device, comprising: an ethylene spherical tank body 1, a low-temperature ethylene storage tank 2 and a flare system 3, two pressure relief ports of the ethylene spherical tank body 1 are fixedly connected with a connecting pipe 4, the output ends of the two connecting pipes 4 are fixedly connected with a transverse pipe 5, the tops of the two transverse pipes 5 are fixedly connected with a first gate valve 6 through a pipeline, the output ends of the two first gate valves 6 are fixedly connected with a second gate valve 7 through a pipeline, the output end of the second gate valve 7 is fixedly connected with a branch pipe 8, and the two output ends of the branch pipe 8 are fixedly connected with The regulating mechanism 9 includes four pressure relief pipes 901, and the output ends of the low-temperature ethylene storage tank 2 and the flare system 3 are respectively fixedly connected to the output ends of two of the four pressure relief pipes 901, and one end of the outer wall of the four pressure relief pipes 901 is fixedly connected to a third gate valve 902, and the opposite ends of two of the four third gate valves 902 and the opposite ends of the other two are fixedly connected to an electromagnetic control valve 903 through a pipeline, and the outer walls of the pipelines of two output ends of the four third gate valves 902 are fixedly connected to a first ball valve 904.

[0021] The effect achieved by the entire embodiment 1 is that, by connecting the low-temperature ethylene storage tank 2 and the flare system 3 respectively through the regulating mechanism 9, when the tank pressure rises, the pressure is relieved preferentially by releasing the pressure to the low-temperature ethylene storage tank 2. When the low-temperature ethylene storage tank 2 does not have the conditions to receive gaseous ethylene or the pressure is still rising, the regulating valve discharged to the flare can be opened to reduce the pressure by discharging part of the ethylene gas.

[0022] Embodiment 2, as Figure 1-Figure 3 As shown, the outer walls of the four pressure relief pipes 901 are fixedly connected with spare pipes 905, and the second ball valves 906 are fixedly connected between the opposite ends of two of the four spare pipes 905 and the opposite ends of the other two, one end of the outer walls of two of the four pressure relief pipes 901 are fixedly connected with pressure gauges 907, and the two pressure gauges 907 are respectively fixedly connected with the two ends of the outer wall of the branch pipe 8, the outer wall of the pressure relief pipe 901 connected to the flare system is fixedly connected with a sharing pipe 10, the outer wall of the transverse pipe 5 is fixedly connected with a fourth gate valve 11 through a pipeline, the output end of the fourth gate valve 11 is fixedly connected with a first connecting pipe 12, and the first connecting pipe 12 is connected to the sharing pipe 10, the outer wall of the transverse pipe 5 is fixedly connected with two fifth gate valves 13 through a pipeline, the output ends of the two fifth gate valves 13 are fixedly connected with spring safety valves 14 through pipelines, the output ends of the two spring safety valves 14 are fixedly connected with second connecting pipes 15, and the two second connecting pipes 15 are connected to the sharing pipe 10.

[0023] The effect achieved by the entire embodiment 2 is that, by providing the spring safety valve 14, the spring safety valve 14 will serve as a pressure relief measure under working conditions where both of the two pressure relief measures are not feasible, thereby ensuring the safe operation of the ethylene spherical tank.

[0024] The working principle of the whole device is: when the pressure of the ethylene spherical tank body 1 is too high, it is divided into three stages:

[0025] When the pressure of the ethylene spherical tank body 1 is relatively high, the first gate valve 6 and the second gate valve 7 can be opened, and then the third gate valve 902 and the electromagnetic control valve 903 in the regulating mechanism 9 connected to the low-temperature ethylene storage tank 2 can be started. The third gate valve 902 is a normally open valve, allowing the ethylene spherical tank 1 to release pressure into the low-temperature ethylene storage tank 2.

[0026] When the low-temperature ethylene storage tank 2 alone cannot release the pressure, the electromagnetic control valve 903 connected to the flare system 3 is opened according to the above steps, and the fourth gate valve 11 can also be opened to allow ethylene to enter the flare system 3 through the sharing pipe 10, and the flare system 3 and the low-temperature ethylene storage tank 2 are used together to release the pressure of the ethylene spherical tank body 1 according to the above steps;

[0027] When the flare system 3 and the low-temperature ethylene storage tank 2 cannot achieve the pressure relief effect together, the fifth gate valve 13 can be opened. Under normal circumstances, the fifth gate valve 13 is always open, and a certain amount of ethylene is discharged through the spring safety valve 14 to perform the pressure relief operation.

[0028] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An ethylene spherical tank pressure relief control device, characterized in that: The invention comprises an ethylene spherical tank body (1), a low-temperature ethylene storage tank (2) and a flare system (3), wherein two pressure relief ports of the ethylene spherical tank body (1) are fixedly connected to a connecting pipe (4), the output ends of the two connecting pipes (4) are fixedly connected to a transverse pipe (5), the tops of the two transverse pipes (5) are fixedly connected to a first gate valve (6) through a pipeline, the output ends of the two first gate valves (6) are fixedly connected to a second gate valve (7) through a pipeline, the output ends of the second gate valve (7) are fixedly connected to a branch pipe (8), and both output ends of the branch pipe (8) are fixedly connected to an adjustment mechanism (9); The regulating mechanism (9) comprises four pressure relief pipes (901), and the output ends of the low-temperature ethylene storage tank (2) and the flare system (3) are respectively fixedly connected to the output ends of two of the four pressure relief pipes (901), one end of the outer wall of the four pressure relief pipes (901) is fixedly connected to a third gate valve (902), two of the four third gate valves (902) have opposite ends and the other two have opposite ends fixedly connected to an electromagnetic control valve (903) through a pipeline, and the outer wall of the pipeline of two output ends of the four third gate valves (902) is fixedly connected to a first ball valve (904).

2. The ethylene spherical tank pressure relief control device according to claim 1 is characterized in that: The outer walls of the four pressure relief pipes (901) are all fixedly connected to a spare pipe (905), and a second ball valve (906) is fixedly connected between opposite ends of two of the four spare pipes (905) and between opposite ends of the other two.

3. The ethylene spherical tank pressure relief control device according to claim 1, characterized in that: One end of the outer wall of two of the four pressure relief pipes (901) is fixedly connected to a pressure meter (907), and the two pressure meters (907) are respectively fixedly connected to the two ends of the outer wall of the branch pipe (8).

4. The ethylene spherical tank pressure relief control device according to claim 1, characterized in that: The outer wall of the pressure relief pipe (901) connected to the flare system is fixedly connected to a sharing pipe (10), the outer wall of the transverse pipe (5) is fixedly connected to a fourth gate valve (11) through a pipeline, the output end of the fourth gate valve (11) is fixedly connected to a first connecting pipe (12), and the first connecting pipe (12) is connected to the sharing pipe (10).

5. The ethylene spherical tank pressure relief control device according to claim 4, characterized in that: The outer wall of the transverse pipe (5) is fixedly connected to two fifth gate valves (13) via a pipeline, the output ends of the two fifth gate valves (13) are fixedly connected to a spring safety valve (14) via a pipeline, the output ends of the two spring safety valves (14) are fixedly connected to a second connecting pipe (15), and the two second connecting pipes (15) are connected to the sharing pipe (10).

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