A drainage structure for low-temperature liquid tank area

Abstract

The present invention discloses a drainage structure for a low-temperature liquid tank area, and relates to the field of drainage mechanisms. Specifically, it includes a tank area drainage channel, a U-shaped pipe, a water collection well, a T-shaped drainage pipe, a water supply pipe, a tank area cofferdam, and a drainage system outside the tank area. The tank area drainage channel is connected to the inlet of the U-shaped pipe, the water collection well is located outside the cofferdam of the tank area, the outlet of the U-shaped pipe is connected to the water collection well, the inlet of the T-shaped drainage pipe is connected to the water collection well, the outlet of the T-shaped drainage pipe is connected to the drainage system outside the tank area, and a blind flange is provided on the top of the T-shaped drainage pipe. When the low-temperature liquid leaks, the water trap of the U-shaped pipe, the water seal water of the water collection well, and the inlet channel of the T-shaped drainage pipe freeze quickly, forming three lines of defense to effectively prevent the low-temperature liquid from flowing into the main drainage pipe, thereby ensuring the isolation of the low-temperature area liquid and the drainage system. The present invention has the characteristics of simple structure, convenient operation and safety.

Description

Technical Field

[0001] The invention relates to the field of drainage mechanisms, and in particular to a drainage structure for a cryogenic liquid tank area. Background Art

[0002] When cryogenic liquids such as liquid oxygen, liquid nitrogen and LNG leak in large quantities, they will absorb heat from the surrounding environment, and the leak point will quickly freeze and condense, damaging surrounding equipment and concrete foundations. Some toxic, harmful and flammable media leaking will also cause personal injury or other safety accidents. In order to prevent cryogenic liquids from spreading to the surrounding environment after leakage, cryogenic storage tanks are usually centralized in tank areas and isolated and protected by firebreaks or cofferdams. Rainwater drainage in cryogenic liquid tank areas is mostly achieved through manual shut-off valves, which are normally closed and opened to drain water on rainy days. This drainage method is not only time-consuming and labor-intensive, but also the manual valves are prone to rust and malfunction if not used for a long time, or untimely manual operation can easily lead to serious water accumulation in the tank area. Summary of the invention

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a drainage structure for a cryogenic liquid tank area, which can effectively and automatically intercept the leaked cryogenic liquid in the tank area and prevent the cryogenic liquid from flowing out through the drainage channel. It has the characteristics of simple structure, easy operation, safety and high promotion value.

[0004] The drainage structure of a low-temperature liquid tank area is characterized in that it includes a tank area drainage channel, a U-shaped pipe, a water collection well, a T-shaped drainage pipe, a water supply pipe, a tank area cofferdam and a drainage system outside the tank area. The tank area drainage channel is connected to the U-shaped pipe inlet, the water collection well is located outside the tank area cofferdam, the U-shaped pipe outlet is connected to the water collection well, the T-shaped drainage pipe inlet is connected to the water collection well, the T-shaped drainage pipe outlet is connected to the drainage system outside the tank area, and a blind flange is provided on the top of the T-shaped drainage pipe, the water supply pipe outlet is connected to the U-shaped pipe inlet, and the water supply pipe inlet is connected to tap water.

[0005] The drainage structure of a low-temperature liquid tank area is characterized in that a first reserved hole matching the size of the U-shaped pipe is provided on one side of the water collection well, and the U-shaped pipe passes through the first reserved hole and is connected to the water collection well.

[0006] The drainage structure of a low-temperature liquid tank area is characterized in that a second reserved hole matching the size of the T-shaped drain pipe outlet is provided on the other side of the water collection well, and the outlet of the T-shaped drain pipe passes through the second reserved hole and is connected to the drainage system outside the tank area.

[0007] The drainage structure of a low-temperature liquid tank area is characterized in that the inlet height of the U-shaped pipe is 0.5-1.0m higher than the outlet height thereof, and the outlet height of the U-shaped pipe is 0.3-0.5m higher than the normal liquid level height of the water collection well.

[0008] The drainage structure of a low-temperature liquid tank area is characterized by comprising an upper cover, the water collection well is provided with an upper cover, and the inner wall of the water collection well is lined with a stainless steel plate.

[0009] The drainage structure of a low-temperature liquid tank area is characterized in that the normal water level of the water collection well is 0.2-0.3m lower than the bottom elevation of the T-shaped drainage pipe outlet.

[0010] The drainage structure of the low-temperature liquid tank area is characterized in that the inlet of the T-shaped drainage pipe is 0.2m-0.3m away from the bottom of the water collection well.

[0011] The drainage structure for a low-temperature liquid tank area is characterized in that the water supply pipe is provided with a float valve for controlling the normal liquid level of the water collection well.

[0012] Beneficial effects of the present invention:

[0013] 1) Compared with the prior art, the technical solution of the present invention is adopted. When a large amount of cryogenic liquid leaks, the cryogenic liquid entering the U-tube quickly mixes with the accumulated water in the U-tube, and the water in the U-tube quickly freezes, forming the first line of defense; the liquid heat exchange between the U-tube and the water collection well causes the water in the water collection well to freeze, or the overflow of the cryogenic liquid into the water collection well causes the upper surface of the accumulated water in the well to freeze quickly. Even if the cryogenic liquid flows out of the cofferdam and into the water collection well, it can be blocked from entering the drainage system outside the tank area, forming the second line of defense; the T-shaped structure of the T-shaped drainage pipe enables the ice to firmly block the channel, forming the third line of defense. These three lines of defense can effectively and automatically intercept the leaked cryogenic liquid in the tank area and prevent the cryogenic liquid from flowing out through the drainage channel;

[0014] 2) The present invention has the characteristics of simple structure, convenient operation, safety and high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] In the figure: 1-U-shaped pipe; 2-water collection well; 3-T-shaped drainage pipe; 4-water supply pipe; 5-tank area cofferdam; 6-upper cover; 7-float valve; 701-safety valve; 702-actuator; 703-connecting rod; 704-float. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings, but the scope of protection of the present invention is not limited to the described scope.

[0018] like Figure 1As shown, a drainage structure for a low-temperature liquid tank area includes a tank area drainage channel, a U-shaped pipe 1, a water collection well 2, a T-shaped drainage pipe 3, a tank area cofferdam 5 and a drainage system outside the tank area. The tank area drainage channel is connected to the inlet of the U-shaped pipe 1, the water collection well 2 is located outside the tank area cofferdam 5, the outlet of the U-shaped pipe 1 is connected to the water collection well 2, and a first reserved hole matching the size of the U-shaped pipe 1 is provided on one side of the water collection well 2. The U-shaped pipe 1 passes through the first reserved hole and is connected to the water collection well 2. The inlet height of the U-shaped pipe 1 is 0.5-1.0m higher than its outlet height, and its outlet height is 0.3-0.5m higher than the normal liquid level of the water collection well 2. The inlet of the U-shaped pipe 1 is located inside the tank area cofferdam 5, and its outlet is located outside the tank area cofferdam 5. The U-shaped pipe 1 in this embodiment is a low-temperature resistant stainless steel pipe to prevent damage from low temperatures.

[0019] In this embodiment, the distance from the inlet of the T-type drain pipe 3 to the bottom of the water collection well 2 is 0.2m-0.3m, and a second reserved hole matching the size of the outlet of the T-type drain pipe 3 is provided on the other side of the water collection well 2. The outlet of the T-type drain pipe 3 is connected to the drainage system outside the tank area through the second reserved hole, wherein a blind flange is provided on the top of the T-type drain pipe 3, mainly used to block the top of the pipe. In addition, when the T-type drain pipe 3 needs to be thawed, the blind flange is opened to break the ice, which is convenient and quick. In this embodiment, the normal water level of the water collection well 2 is 0.2-0.3m lower than the bottom elevation of the outlet pipe of the T-type drain pipe 3.

[0020] In this embodiment, the main structure of the water collection well 2 is a reinforced concrete structure. The water collection well 2 is provided with an upper cover 6, and its inner wall is provided with a stainless steel plate to prevent low-temperature liquid from flowing into the water collection well 2 and freezing and cracking its concrete.

[0021] In this embodiment, a water supply pipe 4 is included, the outlet of the water supply pipe 4 is connected to the inlet of the U-shaped pipe 1, the inlet of the water supply pipe 4 is connected to tap water, and the water supply pipe 4 is provided with a float valve 7, the float valve 7 includes a safety valve 701, an actuator 702, a connecting rod 703 and a float 704, the float 704 of the float valve 7 floats on the liquid surface of the water collection well 2, when the water level of the water collection well 2 rises, the float 704 also rises, the rise of the float 704 drives the connecting rod 703 to rise, the other end of the connecting rod is connected to the actuator 702, the actuator 702 is connected to the safety valve 701 through the connecting rod 703, when it rises to a certain height, the actuator 702 drives the safety valve 701 to close; when the water level drops, the float 704 also drops, the connecting rod 703 drives the actuator 702, and the actuator 702 drives the safety valve 701 to open, so that water can be replenished in time.

[0022] In this embodiment, when the upper cover 6 is made of steel plate, concrete casting, etc., the upper cover 6 is provided with a hole matching the size of the float 704, and the float 704 of the float valve 7 passes through the hole and floats on the liquid surface of the water collection well 2; when the upper cover 6 is made of a grate plate, the upper cover 6 does not need to be provided with a hole. The upper cover 6 is opened, and the float 704 is placed on the liquid surface of the water collection well. The connecting rod 703 connected to the float 704 can pass through the gap of the grate plate itself and be connected to the float 704.

[0023] The float valve 7 provided in this embodiment can automatically control the opening of the water supply pipe 4. In order to prevent the U-shaped tube 1 from drying up, the water supply pipe 4 is opened by the float valve 7, and the water overflows from the outlet of the U-shaped tube 1 into the water collection well 2, thereby ensuring the liquid level of the water collection well 2. At the same time, the water trap of the U-shaped tube 1 can also obtain sufficient water supply.

[0024] When the tank area is drained normally, rainwater first flows into the U-shaped pipe 1 through the tank area drainage channel, then flows into the collection well 2 through the U-shaped pipe 1, then flows into the T-shaped drainage pipe 3 from the collection well 2, and finally is discharged into the drainage system outside the tank area through the T-shaped drainage pipe 3.

[0025] When the cryogenic liquid leaks, the cryogenic liquid flows into the U-shaped tube 1. The water in the U-shaped tube 1 quickly freezes after encountering the cryogenic liquid, and the cryogenic liquid is trapped in the tank area, forming the first line of defense. If the cryogenic liquid accidentally flows out of the tank area cofferdam 5 and enters the water collection well 2, or flows into the water collection well 2 from the U-shaped tube 1, the cryogenic liquid flowing into the water collection well 2 and the accumulated water in the water collection well 2 quickly exchange heat and freeze, and the cryogenic liquid can only accumulate and vaporize on the ice, forming the second line of defense. In addition, the T-shaped structure of the T-shaped drain pipe 3 provided in this embodiment helps ice blocks to block the flow channel, forming the third line of defense, preventing the cryogenic liquid from flowing out through the drainage channel outside the tank area and affecting other areas.

[0026] The low-temperature liquids in the present invention include liquid oxygen, liquid nitrogen and LNG, etc. The drainage structure can not only automatically drain the water, but also the U-shaped pipe 1, the water collection well 2 and the T-shaped drainage pipe 3 can play an ice-sealing role, forming three lines of defense, which greatly improves the safety.

Claims

1. A drainage structure for a cryogenic liquid tank area, Features The invention comprises a tank area drainage channel, a U-shaped pipe (1), a water collecting well (2), a T-shaped drainage pipe (3), a water supply pipe (4), a tank area cofferdam (5) and a drainage system outside the tank area, wherein the tank area drainage channel is connected to the inlet of the U-shaped pipe (1), the water collecting well (2) is located outside the tank area cofferdam (5), the outlet of the U-shaped pipe (1) is connected to the water collecting well (2), the inlet of the T-shaped drainage pipe (3) is connected to the water collecting well (2), the outlet of the T-shaped drainage pipe (3) is connected to the drainage system outside the tank area, and a blind flange is provided at the top of the T-shaped drainage pipe (3), the outlet of the water supply pipe (4) is connected to the inlet of the U-shaped pipe (1), and the inlet of the water supply pipe (4) is connected to tap water.

2. A low-temperature liquid tank area drainage structure according to claim 1, Features A first reserved hole having a size matching that of the U-shaped tube (1) is provided on one side of the water collection well (2); the U-shaped tube (1) passes through the first reserved hole and is connected to the water collection well (2).

3. A low-temperature liquid tank area drainage structure according to claim 2, Features A second reserved hole matching the size of the outlet of the T-shaped drainage pipe (3) is provided on the other side of the water collection well (2); the outlet of the T-shaped drainage pipe (3) passes through the second reserved hole and is connected to the drainage system outside the tank area.

4. A low-temperature liquid tank area drainage structure according to claim 1, Features The inlet height of the U-shaped tube (1) is 0.5-1.0 m higher than the outlet height thereof, and the outlet height of the U-shaped tube (1) is 0.3-0.5 m higher than the normal liquid level of the water collection well (2).

5. A low-temperature liquid tank area drainage structure according to claim 1, Features It comprises an upper cover (6), the water collection well (2) is provided with the upper cover (6), and the inner wall of the water collection well (2) is lined with a stainless steel plate.

6. A low-temperature liquid tank area drainage structure according to claim 1, Features The normal water level of the water collection well (2) is 0.2-0.3 m lower than the bottom elevation of the outlet pipe of the T-shaped drainage pipe (3).

7. A low-temperature liquid tank area drainage structure according to claim 6, Features The inlet of the T-shaped drainage pipe (3) is 0.2m-0.3m away from the bottom of the water collection well (2).

8. A drainage structure for a cryogenic liquid tank area according to claim 1, Features The water supply pipe (4) is provided with a float valve (7) for controlling the normal liquid level of the water collection well (2).

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