Safe water injection device for liquefied hydrocarbon spherical tank

Abstract

The utility model discloses a liquefied hydrocarbon spherical tank safety water injection device which comprises liquefied hydrocarbon spherical tanks and a water injection pump, any liquefied hydrocarbon spherical tank is provided with a water injection line, and the water injection pump is connected to the tank bottom of the liquefied hydrocarbon spherical tank through the water injection line. The water injection line comprises a water injection line stop valve and a water injection valve; the water injection valve comprises a water injection valve air cylinder and a water injection valve hydraulic cylinder, a one-way valve is arranged in front of the water injection valve, a pressure guiding pipe is arranged on the water injection line in front of the one-way valve and connected to the water injection valve hydraulic cylinder, an IA interruption opening valve is arranged on the pressure guiding pipe, instrument air is connected to the water injection valve air cylinder through an IA electromagnetic valve, and the IA electromagnetic valve is connected with the IA interruption opening valve through an instrument air pipe. According to the safe water injection device for the liquefied hydrocarbon spherical tank, the reliability and the practicability of water injection measures of the liquefied hydrocarbon spherical tank are improved, the equipment failure possibility during emergency disposal is reduced, and the equipment investment and the operation risk of the device are effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquefied hydrocarbon storage and relates to a safe water injection device for a liquefied hydrocarbon spherical tank. Background Art

[0002] The water injection measures for liquefied hydrocarbon spherical tanks mainly refer to the need to block material leakage and cool down measures to avoid flash explosions or explosions caused by high temperatures due to large-scale leakage of materials in the storage tank when leakage, fire or explosion occurs. When leakage, fire or other abnormal conditions occur, the liquefied hydrocarbon storage tank needs to be injected with water. Liquefied hydrocarbon is a flammable and explosive hazardous substance. Once leaked, it may cause serious safety accidents. The most prone to leakage is the bottom of the spherical tank. For this reason, a water injection pipeline is set at the bottom. When a leak occurs, water is injected into the tank to raise the liquid level of liquefied hydrocarbons, so that the leakage point is placed below the water surface, reducing the leakage of liquefied hydrocarbons, creating conditions for plugging leaks and gaining time. In general, the purpose of water injection measures is to minimize the damage to the storage tank in fire, explosion or other abnormal events, and to reduce the risk of explosion.

[0003] At present, the safe water injection device for liquefied hydrocarbon spherical tanks has one or more of the following deficiencies:

[0004] 1. When a liquefied hydrocarbon spherical tank leaks, causing instrument signal interruption and instrument air interruption, the water injection valve cannot be opened or closed.

[0005] 2. When multiple spherical tanks are connected in parallel and use one water injection pipeline, the water injection valve is set to fail open. When an abnormal spherical tank leaks, if the instrument air is interrupted and all the spherical tank water injection valves are opened, it is impossible to inject water into the leaking spherical tank separately, and it is easy to cause material backflow between spherical tanks.

[0006] 3. When the spherical tank has only one main inlet and outlet pipe at the bottom, when the spherical tank leaks, the root emergency shut-off valve should be closed in time, but the water injection valve is set before the emergency shut-off valve, and the leaking spherical tank cannot be injected with water.

[0007] 4. The water injection valve is equipped with an on-site handwheel, which serves as the last resort for emergency opening of the water injection valve when it cannot be opened remotely. However, when a leak occurs at the bottom of the spherical tank, it is extremely risky to switch the handwheel on-site, which can easily cause casualties.

[0008] 5. When the water injection valve is closed for a long time, it is easy for the material in the spherical tank to flow back to the water injection line, and the temperature change is easy to cause overpressure in the pipeline.

[0009] Therefore, it is urgent to improve the water injection device of the spherical tank to ensure the safety of the spherical tank and avoid the expansion of production safety accidents in enterprises. Summary of the invention

[0010] The purpose of the utility model is to provide a safe water injection device for a liquefied hydrocarbon spherical tank, which can solve the above-mentioned problems existing in the spherical tank water injection device, improve the reliability and practicality of the liquefied hydrocarbon spherical tank water injection device, reduce the possibility of equipment failure during emergency disposal of the liquefied hydrocarbon spherical tank, and realize safe and standardized operation of spherical tank water injection.

[0011] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0012] A safe water injection device for a liquefied hydrocarbon spherical tank comprises a liquefied hydrocarbon spherical tank and a water injection pump, characterized in that any of the liquefied hydrocarbon spherical tanks is provided with a water injection line, and the water injection pump is connected to the tank bottom of the liquefied hydrocarbon spherical tank through the water injection line; the water injection line comprises a water injection line stop valve and a water injection valve; the water injection valve comprises a water injection valve cylinder and a water injection valve hydraulic cylinder, a one-way valve is arranged in front of the water injection valve, a pressure-guiding pipe is arranged on the water injection line in front of the one-way valve and is connected to the water injection valve hydraulic cylinder, an IA interruption opening valve is arranged on the pressure-guiding pipe, instrument air (IA) is connected to the water injection valve cylinder via the IA solenoid valve, and the IA solenoid valve is connected to the IA interruption opening valve via the instrument air duct.

[0013] Furthermore, a water injection pump outlet valve is provided at the outlet of the water injection pump.

[0014] Furthermore, one end of the water injection line is connected to the outlet valve of the water injection pump, and the other end is connected to the pipeline between the tank bottom material valve of the liquefied hydrocarbon spherical tank and the spherical tank. Specifically, for a spherical tank with one inlet and outlet pipeline, the water injection line is connected between the inlet and outlet main valve and the base of the spherical tank; for a spherical tank with a feed pipeline and a discharge pipeline, the water injection line is connected between the feed valve and the base of the spherical tank.

[0015] Furthermore, a pressure relief line connected to the flare is provided downstream of the water injection pump outlet valve.

[0016] Furthermore, a remote pressure gauge and an on-site pressure gauge are provided on the water injection line.

[0017] Furthermore, a pressure-leading pipe stop valve is provided on the pressure-leading pipe.

[0018] Furthermore, the water injection pump is provided with a water injection pump cross-line.

[0019] Beneficial effects: The utility model of the safe water injection device for liquefied hydrocarbon spherical tanks improves the reliability and practicality of the water injection measures for liquefied hydrocarbon spherical tanks. When encountering instrument signal interruption and instrument air interruption, the water injection valve can still realize water injection of the spherical tank; the device can realize that when multiple spherical tanks are connected in parallel and share a water injection pump, the spherical tank can be injected with water individually; when the process medium inlet and outlet valves of the spherical tank are closed due to a fault, the spherical tank can still be injected with water; at the same time, the pressure monitoring of the spherical tank water injection pipeline can be realized to prevent the valve from leaking internally, resulting in backflow of process materials and overpressure of the pipeline; the situation that the water injection valve cannot be opened due to abnormal conditions and the risk of material backflow are reduced; the equipment investment and operation risk of the device are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the safe water injection device for liquefied hydrocarbon spherical tanks of the utility model;

[0021] Among them, 1. Water injection valve, 2. IA solenoid valve, 3. IA interruption opening valve, 4. Water injection valve cylinder, 5. Water injection valve hydraulic cylinder, 6. Pressure pipe stop valve, 7. Pressure pipe, 8. Water injection line, 9. Remote pressure gauge, 10. Local pressure gauge, 11. Water injection line stop valve, 12. Check valve, 13. Quick connector, 14. Pressure relief line, 15. Water injection pump, 16. Water injection pump cross-line, 17. Tank bottom material valve, 18. Water injection pump outlet valve. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below through specific embodiments. However, it is necessary to point out that the following embodiments are only used to describe the content of the invention and do not constitute a limitation on the protection scope of the present invention.

[0023] like Figure 1 The figure is a schematic structural diagram of the safe water injection device for a liquefied hydrocarbon spherical tank of the utility model.

[0024] The device comprises a plurality of liquefied hydrocarbon spherical tanks, such as Figure 1 The liquefied hydrocarbon spherical tank A and the liquefied hydrocarbon spherical tank B shown in the figure, wherein the liquefied hydrocarbon spherical tank A is provided with a feed pipeline and a discharge pipeline, and the liquefied hydrocarbon spherical tank B is provided with an inlet and outlet pipeline, which are controlled by the inlet and outlet main valve. In order to realize the safe water injection of the liquefied hydrocarbon spherical tank, the utility model includes the following technical measures:

[0025] 1. Water is injected into the bottom of the liquefied hydrocarbon spherical tank and is pressurized and sent to the water injection line by a water injection pump. One water injection pump is set to be connected to the parallel water injection line of any liquefied hydrocarbon spherical tank to realize emergency water injection in case of liquefied hydrocarbon leakage.

[0026] 2. For a spherical tank with only one inlet and outlet pipeline, the water injection line is connected between the inlet and outlet valves and the root of the spherical tank. For a spherical tank with a feed pipeline and a discharge pipeline, the water injection line is connected between the feed valve and the root of the spherical tank.

[0027] 3. For multiple spherical tanks, set up parallel water injection lines, and send water to the spherical tanks through water injection valves. Set up a separate water injection line for each spherical tank, set valves at the outlet of the water injection pump, set local pressure gauges and remote pressure gauges on the water injection lines, and set up a pressure relief line to the flare.

[0028] 4. The water injection valve includes a water injection valve cylinder and a water injection valve hydraulic cylinder. The water injection valve is set to fail closed, and the water injection valve is normally controlled by instrument air. A one-way valve is set in front of the water injection valve, and a pressure pipe is added in front of the one-way valve to the water injection valve hydraulic cylinder. At the same time, an IA interruption opening valve is added to the pressure pipe, and an instrument air duct is added after the instrument air solenoid valve of the water injection valve to the IA interruption opening valve. If the instrument signal is interrupted and the instrument air is interrupted, the water injection valve is equipped with an IA interruption opening valve, and the instrument air is interrupted, then the IA interruption opening valve opens. After starting the water injection process, the pressure of the water injection line increases, and the water injection valve is opened by water pressure to realize emergency water injection of the spherical tank.

[0029] By adopting the device of the utility model, the water injection process of the liquefied hydrocarbon spherical tank is as follows: fire water → quick connector → water injection pump (or pump inlet and outlet cross-line) → water injection line (remote / local pressure monitoring and flare torch pressure relief) → IA solenoid valve / water injection valve cylinder (or IA interruption opening valve → water injection valve hydraulic cylinder) → water injection valve → spherical tank root material pipeline → spherical tank.

[0030] like Figure 1 As shown, fire water / production water is delivered to the water injection pump 15 through the quick connector 13, and a water injection pump crossover line 16 is provided at the inlet and outlet of the water injection pump 15, and the water injection pump outlet valve 18 is connected to the liquefied hydrocarbon spherical tank A and the liquefied hydrocarbon spherical tank B through the water injection line 8. Taking the liquefied hydrocarbon spherical tank A as an example, the water injection line 8 includes a water injection valve 1, and a water injection line stop valve 11 is provided. A pressure relief line 14 for the flare is provided after the water injection pump outlet valve 18.

[0031] The water injection line 8 includes a water injection line stop valve 11, a one-way valve 12 and a water injection valve 1 in sequence; the water injection valve 1 includes a water injection valve cylinder 4 and a water injection valve hydraulic cylinder 5, a pressure pipe 7 is provided on the water injection line 8 to connect to the water injection valve hydraulic cylinder 5, a pressure pipe stop valve 6 and an IA interruption opening valve 3 are provided on the pressure pipe 7, the instrument air is connected to the water injection valve cylinder 4 via the IA solenoid valve 2, and the IA solenoid valve 2 is connected to the IA interruption opening valve 3 via the instrument air pipe. Local and remote pressure gauges 9 and 10 are provided between the water injection line stop valve 11 and the tank area cofferdam. For liquefied hydrocarbon spherical tanks with single pipelines and double pipelines and bottom inlet and outlet, the water injection line 8 is led to the pipeline between the tank bottom material valve 17 and the spherical tank.

[0032] Fire water / production water passes through the water injection pump 15, and enters the water injection line 8 through the water injection pump outlet valve 18 and the water injection line stop valve 11, and then enters the spherical tank through the water injection valve 1 to complete the water injection of the spherical tank; when the water injection valve 1 is normally remotely controlled, the instrument air passes through the IA solenoid valve 2 to the water injection valve cylinder 4 to control the switch of the water injection valve 1; if the instrument air or solenoid valve signal is interrupted, the IA interruption opening valve 3 will open, and after the water injection is started, there will be water pressure in the water injection line 8, and the water pressure passes through the pressure pipe stop valve 6 and the pressure pipe 7, and then through the IA interruption opening valve 3 to the water injection valve hydraulic cylinder 5, and the water injection valve 1 opens to complete the water injection of the spherical tank.

[0033] The above-mentioned liquefied hydrocarbon spherical tank safety water injection device has the following advantages:

[0034] 1. When leakage, fire, explosion or other abnormal situations occur at the bottom of the liquefied hydrocarbon spherical tank, the practicality, safety and reliability of the remote water injection valve can be improved.

[0035] 2. When the liquefied hydrocarbon spherical tank is used for emergency water injection, it has greater operational flexibility and selectivity.

[0036] 3. It can monitor the pressure of the water injection pipeline in time, and can also timely drain and relieve the pressure of the materials that flow back due to valve leakage.

Claims

1. A safe water injection device for a liquefied hydrocarbon spherical tank, comprising a liquefied hydrocarbon spherical tank and a water injection pump (15), characterized in that: Any of the liquefied hydrocarbon spherical tanks is provided with a water injection line (8), and the water injection pump (15) is connected to the tank bottom of the liquefied hydrocarbon spherical tank through the water injection line (8); the water injection line (8) includes a water injection line stop valve (11) and a water injection valve (1); the water injection valve (1) includes a water injection valve cylinder (4) and a water injection valve hydraulic cylinder (5); a one-way valve (12) is provided in front of the water injection valve (1); a pressure guide pipe (7) is provided on the water injection line (8) in front of the one-way valve (12) and is connected to the water injection valve hydraulic cylinder (5); an IA interruption opening valve (3) is provided on the pressure guide pipe (7); instrument air is connected to the water injection valve cylinder (4) via an IA solenoid valve (2); and the IA solenoid valve (2) is connected to the IA interruption opening valve (3) via an instrument air pipe.

2. The liquefied hydrocarbon spherical tank safety water injection device according to claim 1 is characterized in that: A water injection pump outlet valve (18) is provided at the outlet of the water injection pump (15).

3. The liquefied hydrocarbon spherical tank safety water injection device according to claim 2 is characterized in that: One end of the water injection line (8) is connected to the outlet valve (18) of the water injection pump, and the other end is connected to the pipeline between the tank bottom material valve (17) of the liquefied hydrocarbon spherical tank and the spherical tank.

4. The liquefied hydrocarbon spherical tank safety water injection device according to claim 2 is characterized in that: A pressure relief line (14) connected to the flare is arranged downstream of the water injection pump outlet valve (18).

5. The liquefied hydrocarbon spherical tank safety water injection device according to claim 1 is characterized in that: A remote pressure gauge (9) and a local pressure gauge (10) are provided on the water injection line (8).

6. The liquefied hydrocarbon spherical tank safety water injection device according to claim 1 is characterized in that: The pressure-guiding pipe (7) is provided with a pressure-guiding pipe stop valve (6).

7. The liquefied hydrocarbon spherical tank safety water injection device according to claim 1 is characterized in that: The water injection pump (15) is provided with a water injection pump crossover line (16).

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