Storage tank discharging pipeline pressure relief structure

Abstract

The utility model relates to the technical field of chemical equipment safety, and particularly discloses a storage tank discharging pipeline pressure relief structure which comprises a storage tank, the storage tank is connected with a discharging pipeline, the discharging end of the discharging pipeline is connected with reaction equipment, the discharging pipeline is provided with a discharging pump and a one-way valve, and the discharging pump and the one-way valve are both connected with a control box. According to the utility model, the potential safety hazards of pressure building expansion, pipeline displacement, sight glass burst and the like of the discharge pipeline caused by the long discharge pipeline in the prior art are solved, and the discharge pipeline pressure relief device is very suitable for large factories with more storage tanks and farther production workshops; and during pressure relief, redundant gas generated by thermal expansion of the materials due to high temperature can be exhausted out of the pipeline through the pressure relief assembly in the exhaust pipe, and the potential safety hazard that the redundant gas flows back into the storage tank, and the air pressure in the storage tank is increased is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment safety, and specifically designs a pressure relief structure for a discharging pipeline of a storage tank. Background Art

[0002] Sealed containers used to store liquid or gas raw materials are also called storage tanks. Storage tanks are essential infrastructure in the petrochemical industry. They are easy to use, have large storage capacity, and are safe. However, the storage tank area of ​​large enterprises is generally relatively far away from the production workshop, and requires a very long delivery pipeline to ensure that the raw materials in the storage tank can be transported to the production workshop through a pump. However, due to the long discharge pipeline, there is a lot of material stored in the discharge pipeline. If it is not used for a long time, the material in the discharge pipeline will expand due to heat, resulting in pressure buildup in the discharge pipeline, posing a safety hazard.

[0003] In the prior art, in order to ensure the smooth flow of pipelines and prevent materials from solidifying at low temperatures in the pipelines, the pipelines need to be insulated and heated. Since the discharge pipeline is long and there is a lot of material in the pipeline, when the discharge pipeline stops transporting materials under high temperature conditions for a long time, the material in the discharge pipeline expands due to the heat due to the continuous heating of the discharge pipeline by the insulation and heating, generating a large amount of air, which leads to pipeline pressure buildup, causing the stretching of the pipeline expansion joint, pipeline displacement, sight glass bursting and other safety hazards. Based on this, the inventor purposefully provides a tank discharge pipeline pressure relief structure that can relieve pressure in time and prevent pipeline pressure buildup. Utility Model Content

[0004] The utility model aims to address the deficiencies of the prior art and to provide a storage tank discharge pipeline pressure relief structure that can timely relieve pressure and prevent pipeline pressure build-up, so as to solve the problem of heat expansion of materials in the existing pipeline, pipeline pressure build-up, and potential safety hazards.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A storage tank discharge pipeline pressure relief structure, comprising a storage tank, a discharge pipeline connected to the storage tank, a discharge end of the discharge pipeline connected to a reaction device, a discharge pump and a one-way valve arranged on the discharge pipeline, and both the discharge pump and the one-way valve are connected to a control box, a reflux component is arranged between the discharge pipeline and the storage tank, a pressure relief pipeline is plugged on the discharge pipeline, and the connection between the pressure relief pipeline and the discharge pipeline is located between the one-way valve and the reaction device, the pressure relief pipeline is connected to the storage tank through the reflux component, and a safety valve and an exhaust pipe are arranged on the pressure relief pipeline A pressure relief component is provided in the exhaust pipe, and the safety valve and the exhaust pipe are connected to the control box. Anti-solidification components are provided on the discharge pipeline and the pressure relief pipeline. When the pressure value in the discharge pipeline exceeds the safety valve threshold, the control box controls the safety valve to open, and the material and high-pressure air in the discharge pipeline enter the pressure relief pipeline. The high-pressure air is discharged from the exhaust pipe, and the material flows back to the storage tank through the pressure relief pipeline through the reflux component, thereby relieving the pressure in the discharge pipeline. When the pressure value in the discharge pipeline is lower than the safety valve threshold, the control box controls the safety valve to close.

[0007] As a further optimization or improvement of this solution.

[0008] The reflux component includes a reflux pipeline and a reflux valve. The reflux valve is arranged on the reflux pipeline and connected to the control box. An anti-solidification component is arranged on the reflux pipeline. The inlet end of the reflux pipeline is connected to the discharge pipeline, and its discharge end is connected to the storage tank, and the discharge end of the pressure relief pipeline is connected to the reflux pipeline. The connection between the reflux pipeline and the discharge pipeline is located between the discharge pump and the discharge pipeline, and the connection between the pressure relief pipeline and the reflux pipeline is located between the reflux valve and the storage tank.

[0009] As a further optimization or improvement of this solution.

[0010] The pressure relief assembly includes a circular ring, a sealing plate, an exhaust port and a spring. The circular ring is fixedly installed in the exhaust pipe. The top plate of the exhaust pipe is connected to the sealing plate by a spring. The sealing plate abuts against the circular ring. A plurality of exhaust ports are arranged on the circumference of the exhaust pipe outlet end. When high-pressure air enters the pressure relief pipeline, most of the high-pressure air will enter the exhaust pipe. The impact force of the high-pressure air on the sealing plate is greater than the spring force, pushing the sealing plate away from the circular ring. The high-pressure air in the exhaust pipe is discharged through the exhaust port through the gap between the circular ring and the sealing plate.

[0011] As a further optimization or improvement of this solution.

[0012] The side of the sealing plate facing the circular ring is a concave surface.

[0013] As a further optimization or improvement of this solution.

[0014] The anti-solidification component includes a medium pipe and an insulation component. The three medium pipes are respectively sleeved on the discharge pipeline, the pressure relief pipeline and the return pipeline. Each medium pipe is provided with a connecting pipe for connecting to the heating equipment, and each medium pipe is provided with an insulation component.

[0015] As a further optimization or improvement of this solution.

[0016] The heat-insulating component comprises heat-insulating cotton and an annular carrier, and the heat-insulating cotton is installed on the medium pipe through the annular carrier.

[0017] Beneficial effects of the utility model:

[0018] 1. The utility model monitors the pressure in the discharge pipeline in real time through the safety valve, and can timely relieve the pressure when the pressure in the discharge pipeline is too high, thus solving the safety hazards in the existing process such as pressure build-up and expansion of the discharge pipeline, pipeline displacement, and sight glass bursting due to the long discharge pipeline. The utility model is very suitable for large factories with many storage tanks and far production workshops. In addition, the utility model can discharge the excess gas generated by the thermal expansion of the material due to the high temperature through the pressure relief component in the exhaust pipe, thus avoiding the safety hazard of excess gas flowing back into the storage tank and increasing the air pressure in the storage tank.

[0019] 2. When the utility model releases pressure on the discharge pipeline, when the high-pressure air impacts the concave surface of the sealing plate, the airflow will push the sealing plate away from the ring. At this time, the spring will be compressed, and the high-pressure air in the exhaust pipe will be discharged through the exhaust port through the gap between the ring and the sealing plate, thereby achieving the effect of pressure relief. When the impact force of the high-pressure air on the sealing plate is less than the elastic force of the spring, the spring will push the sealing plate to close the ring. This structure can discharge excess high-pressure gas out of the pipeline in time and can be closed in time to ensure the stability of the air pressure in the pipeline.

[0020] 3. The utility model connects the pressure relief pipeline to the reflux pipeline. When the discharge pipeline is depressurized, the material in the discharge pipeline will be connected to the reflux pipeline through the pressure relief pipeline. Since a reflux valve is provided on the reflux pipeline, the material in the discharge pipeline will eventually be discharged into the storage tank, and a section of the reflux pipeline is shared, saving the cost of laying pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0023] Figure 2 It is a schematic diagram of the cross-sectional structure of the exhaust pipe.

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the medium pipe.

[0025] The figure shows:

[0026] 1. Storage tank; 2. Discharge pump; 3. Discharge pipeline; 4. One-way valve; 5. Pressure relief pipeline; 6. Return pipeline; 7. Return valve; 8. Safety valve; 9. Exhaust pipe; 10. Ring; 11. Sealing plate; 12. Exhaust port; 13. Spring; 14. Medium pipe; 15. Insulation cotton; 16. Ring carrier. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-Figure 3 A storage tank discharge pipeline pressure relief structure comprises a storage tank 1, the storage tank 1 is connected with a discharge pipeline 3, the discharge end of the discharge pipeline 3 is connected with a reaction device, the discharge pipeline 3 is provided with a discharge pump 2 and a one-way valve 4, and the discharge pump 2 and the one-way valve 4 are both connected to a control box, a reflux component is provided between the discharge pipeline 3 and the storage tank 1, a pressure relief pipeline 5 is plugged into the discharge pipeline 3, and the connection between the pressure relief pipeline 5 and the discharge pipeline 3 is located between the one-way valve 4 and the reaction device, the pressure relief pipeline 5 is connected with the storage tank 1 through the reflux component, and the pressure relief pipeline 5 is provided with a safety valve 8 and a discharge valve 9. The air pipe 9 and the exhaust pipe 9 are provided with a pressure relief component, and the safety valve 8 and the exhaust pipe 9 are connected to the control box. The discharge pipeline 3 and the pressure relief pipeline 5 are provided with anti-solidification components. When the pressure value in the discharge pipeline 3 exceeds the threshold value of the safety valve 8, the control box controls the safety valve 8 to open, and the material and high-pressure air in the discharge pipeline 3 enter the pressure relief pipeline 5. The high-pressure air is discharged from the exhaust pipe 9, and the material flows back to the storage tank 1 through the reflux component through the pressure relief pipeline 5, thereby relieving the pressure in the discharge pipeline 3. When the pressure value in the discharge pipeline 3 is lower than the threshold value of the safety valve 8, the control box controls the safety valve 8 to close.

[0029] In a specific embodiment, the control box includes a PLC control system, an actuator, a sensor, etc., and the reaction equipment is a reactor. The above components are all prior art. The specific models are not disclosed in the utility model, which does not affect the integrity of the utility model.

[0030] The working principle of the utility model is as follows: during production operation, the operator sets the required amount of raw materials through the control box, and sets the system parameters of the safety valve 8 according to the height, length, material properties, material storage temperature and other aspects of the discharge pipeline 3, namely the starting pressure and reset pressure of the safety valve 8, that is, the threshold value. The raw materials in the storage tank 1 are transported to the reaction equipment in the production workshop through the discharge pipeline 3 by the discharge pump 2, wherein a small part of the raw materials will flow back to the storage tank 1 through the reflux component, which will not cause a significant reduction in the amount of transported raw materials. When all the materials are transported, the discharge pump 2 is stopped. Since a one-way valve 4 is provided on the discharge pipeline 3, the material in the one-way valve 4 cannot flow back to the storage tank 1. In order to ensure the smooth flow of the pipeline and prevent the material from solidifying at low temperature in the pipeline, an anti-solidification component for heating and insulating the pipeline is provided on the pipeline. If the storage tank 1 is not used for a long time, the material in the discharge pipeline 3 will expand due to the long-term high temperature and generate pressure.

[0031] When the pressure in the discharge pipeline 3 is higher than the threshold of the safety valve 8, the control box controls the safety valve 8 to trip. At this time, the material and high-pressure air in the discharge pipeline 3 enter the pressure relief pipeline 5. Suddenly, a large amount of high-pressure air enters the pressure relief pipeline 5, which will cause the air pressure in the pressure relief pipeline 5 to increase. At this time, the high-pressure air in the pressure relief pipeline 5 will enter the exhaust pipe 9 and be discharged through the pressure relief component. At the same time, the material will be connected to the reflux component through the pressure relief pipeline 5, and finally discharged into the storage tank 1; when the pressure in the discharge pipeline 3 is lower than the threshold of the safety valve 8, the control box controls the safety valve 8 to reset, and the pressure in the discharge pipeline 3 returns to normal.

[0032] The pressure in the discharge pipeline 3 is monitored in real time by the safety valve 8. When the pressure in the discharge pipeline 3 is too high, the pressure can be relieved in time, which solves the safety hazards in the existing process such as pressure buildup and expansion of the discharge pipeline 3, pipeline displacement, and sight glass bursting due to the long discharge pipeline 3. It is very suitable for large factories with many storage tanks 1 and far production workshops. Moreover, when the pressure is relieved, the excess gas generated by the thermal expansion of the material due to the high temperature can be discharged out of the pipeline through the pressure relief component in the exhaust pipe 9, which avoids the excess gas from flowing back into the storage tank 1 and causing the safety hazard of increased air pressure in the storage tank 1.

[0033] Specifically, the reflux component includes a reflux pipeline 6 and a reflux valve 7. The reflux valve 7 is arranged on the reflux pipeline 6, and the reflux valve 7 is connected to the control box. An anti-solidification component is arranged on the reflux pipeline 6. The feed end of the reflux pipeline 6 is connected to the discharge pipeline 3, and its discharge end is connected to the storage tank 1, and the discharge end of the pressure relief pipeline 5 is connected to the reflux pipeline 6. The connection between the reflux pipeline 6 and the discharge pipeline 3 is located between the discharge pump 2 and the discharge pipeline 3, and the connection between the pressure relief pipeline 5 and the reflux pipeline 6 is located between the reflux valve 7 and the storage tank 1.

[0034] In a specific embodiment, the reflux valve 7 is configured as a pneumatic valve. When the discharge pump 2 transports the raw materials into the discharge pipeline 3, the control box controls the reflux valve 7 to open, and a small portion of the raw materials will directly flow back into the storage tank 1 through the reflux pipeline 6. The main purpose is to prevent a large amount of material from pouring into the discharge pipeline 3 in a short period of time, to avoid material blockage in the discharge pipeline 3, and after the material delivery is completed, the reflux valve 7 will also be closed.

[0035] When the discharge pipeline 3 is depressurized, the material in the discharge pipeline 3 will be connected to the reflux pipeline 6 through the pressure relief pipeline 5. Since the reflux pipeline 6 is provided with a reflux valve 7, the material in the discharge pipeline 3 will eventually be discharged into the storage tank 1, and a section of the reflux pipeline 6 is shared, saving the cost of laying pipelines.

[0036] More specifically, the pressure relief assembly includes a ring 10, a sealing plate 11, an exhaust port 12 and a spring 13. The ring 10 is fixedly installed in the exhaust pipe 9. The top plate of the exhaust pipe 9 is connected to the sealing plate 11 through the spring 13. The sealing plate 11 abuts against the ring 10. A plurality of exhaust ports 12 are arranged around the circumference of the exhaust end of the exhaust pipe 9. When high-pressure air enters the pressure relief pipeline 5, most of the high-pressure air will enter the exhaust pipe 9. The impact force of the high-pressure air on the sealing plate 11 is greater than the elastic force of the spring 13, pushing the sealing plate 11 away from the ring 10. The high-pressure air in the exhaust pipe 9 is discharged through the exhaust port 12 through the gap between the ring 10 and the sealing plate 11.

[0037] In a specific embodiment, the exhaust pipe 9 is long enough and the height of the ring 10 is higher than the height of the material entering the exhaust pipe 9, so that the material will not affect the pressure relief component in the exhaust pipe 9. When the safety valve 8 is just opened, a large amount of high-pressure air rushes into the pressure relief pipeline 5, which will cause the air pressure inside it to increase. When the impact force of the high-pressure air on the sealing plate 11 is greater than the elastic force of the spring 13, the airflow will push the sealing plate 11 away from the ring 10. At this time, the spring 13 will be compressed, and the high-pressure air in the exhaust pipe 9 will be discharged through the exhaust port 12 through the gap between the ring 10 and the sealing plate 11, thereby achieving the effect of pressure relief; when the impact force of the high-pressure air on the sealing plate 11 is less than the elastic force of the spring 13, the spring 13 will push the sealing plate 11 to close the ring 10.

[0038] Meanwhile, it should be noted that the side of the sealing plate 11 facing the ring 10 is a concave surface.

[0039] In a specific embodiment, the side of the sealing plate 11 facing the ring 10 is the side that is directly subjected to the impact of high-pressure air. Designing this side as a concave surface can increase the impact of the airflow impact to a greater extent, so that the sealing plate 11 can be moved away from the ring 10 in time, thereby discharging the high-pressure air in the exhaust pipe 9 through the exhaust port 12, thereby avoiding the air pressure in the pressure relief pipeline 5 always being maintained at a high pressure state.

[0040] More specifically, the anti-solidification component includes a medium pipe 14 and an insulation component. The three medium pipes 14 are respectively sleeved on the discharge pipeline 3, the pressure relief pipeline 5 and the return pipeline 6. Each medium pipe 14 is provided with a connecting pipe for connecting to the heating equipment, and each medium pipe 14 is provided with an insulation component.

[0041] In a specific embodiment, each medium pipe 14 is provided with a timed exhaust valve, the heating equipment is a factory steam pipeline, the above components are all prior art, and the specific models are not disclosed in the utility model, which does not affect the integrity of the utility model; by introducing factory steam into the medium pipe 14, the discharge pipeline 3, the pressure relief pipeline 5 and the reflux pipeline 6 are heated to ensure the fluidity of the material in the pipeline and prevent low-temperature solidification.

[0042] Meanwhile, it should be noted that the thermal insulation component includes thermal insulation cotton 15 and an annular carrier 16 , and the thermal insulation cotton 15 is installed on the medium pipe 14 through the annular carrier 16 .

[0043] In a specific embodiment, the heat preservation effect of the heat preservation cotton 15 can prevent the heat of the medium pipe 14 from being dissipated into the external air, thereby significantly improving the heating and heat preservation effect of the pipeline, which serves as a guarantee for the smooth flow of the pipeline.

[0044] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A pressure relief structure for a storage tank discharge pipeline, characterized in that: The invention comprises a storage tank (1), wherein the storage tank (1) is connected to a discharge pipeline (3), the discharge end of the discharge pipeline (3) is connected to a reaction device, a discharge pump (2) and a one-way valve (4) are arranged on the discharge pipeline (3), and the discharge pump (2) and the one-way valve (4) are both connected to a control box, a reflux component is arranged between the discharge pipeline (3) and the storage tank (1), a pressure relief pipeline (5) is plugged into the discharge pipeline (3), and the connection between the pressure relief pipeline (5) and the discharge pipeline (3) is located between the one-way valve (4) and the reaction device, the pressure relief pipeline (5) is connected to the storage tank (1) through the reflux component, and a safety valve (8) and an exhaust pipe (9) are arranged on the pressure relief pipeline (5). A pressure relief component is provided in the exhaust pipe (9), and the safety valve (8) and the exhaust pipe (9) are both connected to the control box. Anti-solidification components are provided on the discharge pipeline (3) and the pressure relief pipeline (5). When the pressure value in the discharge pipeline (3) exceeds the threshold value of the safety valve (8), the control box controls the safety valve (8) to open, and the material and high-pressure air in the discharge pipeline (3) enter the pressure relief pipeline (5). The high-pressure air is discharged from the exhaust pipe (9), and the material flows back to the storage tank (1) through the pressure relief pipeline (5) and the reflux component, thereby relieving the pressure in the discharge pipeline (3). When the pressure value in the discharge pipeline (3) is lower than the threshold value of the safety valve (8), the control box controls the safety valve (8) to close.

2. A storage tank discharge pipeline pressure relief structure according to claim 1, characterized in that: The reflux assembly comprises a reflux pipeline (6) and a reflux valve (7). The reflux valve (7) is arranged on the reflux pipeline (6), and the reflux valve (7) is connected to a control box. An anti-solidification assembly is arranged on the reflux pipeline (6). The inlet end of the reflux pipeline (6) is connected to the outlet pipeline (3), and the outlet end thereof is connected to the storage tank (1). The outlet end of the pressure relief pipeline (5) is connected to the reflux pipeline (6). The connection between the reflux pipeline (6) and the outlet pipeline (3) is located between the outlet pump (2) and the outlet pipeline (3), and the connection between the pressure relief pipeline (5) and the reflux pipeline (6) is located between the reflux valve (7) and the storage tank (1).

3. A storage tank discharge pipeline pressure relief structure according to claim 1, characterized in that: The pressure relief assembly comprises a circular ring (10), a sealing plate (11), an exhaust port (12) and a spring (13). The circular ring (10) is fixedly installed in the exhaust pipe (9). The top plate of the exhaust pipe (9) is connected to the sealing plate (11) via the spring (13). The sealing plate (11) abuts against the circular ring (10). A plurality of exhaust ports (12) are arranged around the circumference of the exhaust end of the exhaust pipe (9). When high-pressure air enters the pressure relief pipeline (5), most of the high-pressure air enters the exhaust pipe (9). The impact force of the high-pressure air on the sealing plate (11) is greater than the elastic force of the spring (13), pushing the sealing plate (11) away from the circular ring (10). The high-pressure air in the exhaust pipe (9) passes through the gap between the circular ring (10) and the sealing plate (11) and is discharged through the exhaust port (12).

4. A storage tank discharge pipeline pressure relief structure according to claim 3, characterized in that: The side of the sealing plate (11) facing the circular ring (10) is a concave surface.

5. A storage tank discharge pipeline pressure relief structure according to claim 2, characterized in that: The anti-solidification component comprises a medium pipe (14) and a heat preservation component, wherein the three medium pipes (14) are respectively sleeved on a discharge pipeline (3), a pressure relief pipeline (5) and a return pipeline (6), each medium pipe (14) is provided with a connecting pipe for connecting to a heating device, and each medium pipe (14) is provided with a heat preservation component.

6. A storage tank discharge pipeline pressure relief structure according to claim 5, characterized in that: The thermal insulation component comprises thermal insulation cotton (15) and an annular carrier (16), and the thermal insulation cotton (15) is installed on the medium pipe (14) via the annular carrier (16).

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