A liquid seal tank structure for storage tanks

Abstract

This utility model relates to a liquid-sealed tank structure for storage tanks, belonging to the technical field of chemical fiber equipment. It includes a liquid-sealed tank with an end cap at its upper end. A water-passing pipe extends through and beyond the end cap inside the tank. An inlet pipe extends from the lower part of the water-passing pipe to the top of the end cap. An outlet pipe, connected to the upper part of the inlet pipe, is located above the end cap. A vent pipe, not connected to the water-passing pipe, extends to both ends of the water-passing pipe. An exhaust base is located at the lower end of the vent pipe. Hot water is allowed to enter through the inlet pipe and exit through the outlet pipe via the internal water-passing pipe, enabling heat transfer or hot water supply. A certain height of liquid-sealed water inside the tank isolates the water-passing pipe from the external atmosphere, preventing gas leakage into the environment from the end of the water-passing pipe.

Description

Technical Field

[0001] This utility model relates to the field of chemical fiber equipment technology, and specifically to a liquid seal tank structure for storage tanks. Background Technology

[0002] The caprolactam storage tank liquid seal tank is a key piece of equipment to ensure tank pressure and product quality. Nitrogen gas from the storage tank enters the liquid seal tank inlet through a pipeline until it is vented at the bottom of the liquid seal tank. When the liquid seal water level reaches the normal level, the pressure of the storage tank is always around 4 kPa. This ensures that the quality of caprolactam is well protected by nitrogen gas and is not affected. At the same time, it also prevents the storage tank from generating negative pressure, thus protecting the equipment.

[0003] Because caprolactam (CPL) is easily oxidized in storage tanks, nitrogen needs to be injected into the liquid-sealed tank containing desalinated water to displace the air inside and prevent the entry of external air. However, traditional liquid-sealed tanks suffer from significant nitrogen leakage and strong impact forces. This results in the liquid-sealed water inside being constantly replenished, causing not only a large waste of water and nitrogen but also environmental impact and damage. Summary of the Invention

[0004] This invention primarily addresses the shortcomings of existing technologies by providing a liquid-sealed tank structure for storage tanks. Through an internal water-passing pipe, hot water is allowed to enter from the inlet pipe and flow out from the outlet pipe, thus achieving heat transfer or hot water supply. A certain height of liquid-sealed water within the tank isolates the water-passing pipe from the external atmosphere, preventing gas leakage into the environment from the end of the water-passing pipe.

[0005] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions:

[0006] A liquid-sealed tank structure for a storage tank includes a liquid-sealed tank, an end cap at the upper end of the liquid-sealed tank, a water-passing pipe extending through and out of the end cap inside the liquid-sealed tank, an inlet pipe extending to the top of the end cap at the lower part of the water-passing pipe, an outlet pipe connected to the upper part of the inlet pipe at the top of the end cap, a vent pipe extending to both ends of the water-passing pipe but not connected to the water-passing pipe inside the water-passing pipe, and an exhaust base at the lower end of the vent pipe.

[0007] An independent venting pipe ensures that the pressure inside the water pipe is balanced with atmospheric pressure or the pressure of a specific system, preventing equipment damage caused by pressure fluctuations (such as thermal expansion and contraction, water hammer). Simultaneously, the venting base design allows non-condensable gases (such as air) accumulated in the pipe to be expelled.

[0008] Preferably, the vent pipe is equipped with an air inlet flange at its upper end. The water inlet pipe is equipped with a hot water inlet flange at its front end. The water outlet pipe is equipped with a hot water outlet flange at its front end.

[0009] Preferably, the exhaust base includes a serrated base plate, and an integrally welded reducer is provided between the serrated base plate and the ventilation pipe. The serrated base plate is provided with a plurality of exhaust holes.

[0010] Preferably, the liquid-sealed tank has a water supply pipe on one side of its upper part, and a water supply flange at the front end of the water supply pipe. The liquid-sealed tank also has an overflow pipe on the other side of its upper part, which is higher than the water supply pipe, and an overflow flange at the front end of the overflow pipe.

[0011] Preferably, the liquid seal tank is equipped with a float valve that is inserted into and connected to the water supply pipe. Through the combination of the float valve and the overflow pipe, the height of the liquid seal water in the tank is automatically maintained within a constant range without manual intervention.

[0012] Preferably, the liquid-sealed tank is provided with a drain flange at its lower end, and a drain pipe is provided between the drain flange and the liquid-sealed tank.

[0013] Preferably, the liquid-sealed tank has several ring-shaped support legs on its lower periphery.

[0014] This invention can achieve the following effects:

[0015] This invention provides a liquid-sealed tank structure for storage tanks. Compared with existing technologies, it allows hot water to enter through the inlet pipe and flow out through the outlet pipe via an internal water pipe, thus achieving heat transfer or hot water supply. A certain height of liquid-sealed water inside the tank isolates the water pipe from the external atmosphere, preventing gas from leaking into the environment from the end of the water pipe. Attached Figure Description

[0016] Figure 1 This is a structural cross-sectional view of the present invention.

[0017] Figure 2 This is a structural cross-sectional view of the exhaust base in this utility model.

[0018] Figure 3 This is a bottom view of the exhaust base in this utility model.

[0019] In the diagram: 1. Hot water inlet flange; 2. Air inlet flange; 3. Vent pipe; 4. Hot water outlet flange; 5. Water outlet pipe; 6. Water passage pipe; 7. End cap; 8. Overflow flange; 9. Overflow pipe; 10. Liquid seal tank; 11. Support leg; 12. Drain pipe; 13. Drain flange; 14. Exhaust base; 15. Water inlet pipe; 16. Float valve; 17. Water supply pipe; 18. Water supply flange; 19. Reducer; 20. Serrated base plate; 21. Exhaust hole. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0021] Example: Figure 1 , Figure 2 and Figure 3 As shown, a liquid seal tank structure for a storage tank includes a liquid seal tank 10. A drain flange 13 is provided at the lower end of the liquid seal tank 10, and a drain pipe 12 is provided between the drain flange 13 and the liquid seal tank 10. Three ring-shaped support legs 11 are provided around the lower periphery of the liquid seal tank 10. A water supply pipe 17 is provided on one side of the upper part of the liquid seal tank 10, with a water supply flange 18 at its front end. A float valve 16, which is inserted and connected to the water supply pipe 17, is provided inside the liquid seal tank 10. An overflow pipe 9, higher than the water supply pipe 17, is provided on the other side of the upper part of the liquid seal tank 10, with an overflow flange 8 at its front end. An end cap 7 is provided at the upper end of the liquid seal tank 10. A water passage pipe 6, penetrating the end cap 7 and extending beyond it, is provided inside the liquid seal tank 10. A water inlet pipe 15, extending above the end cap 7, is provided at the lower part of the water passage pipe 6, with a hot water inlet flange 1 at its front end. Above the end cap 7 is a water outlet pipe 5 connected to the upper part of the water inlet pipe 15, and the front end of the water outlet pipe 5 is provided with a hot water outlet flange 4. Inside the water passage pipe 6 is a vent pipe 3 that is not connected to the water passage pipe 6 and extends out of both ends of the water passage pipe 6. The upper end of the vent pipe 3 is provided with an air inlet flange 2, and the lower end of the vent pipe 3 is provided with an exhaust base 14. The exhaust base 14 includes a serrated base plate 20, and an integrally welded reducer pipe 19 is provided between the serrated base plate 20 and the vent pipe 3. The serrated base plate 20 is provided with 20 exhaust holes 21.

[0022] Workflow:

[0023] (1) Initial state: After the equipment is installed, water is injected into the liquid seal tank 10 through the water supply pipe 17 until water flows out from the overflow pipe 9, and then the process is stopped. At this time, the float valve 16 is closed due to the high water level, and a stable liquid seal water level is established in the tank. The serrated structure of the exhaust base 14 is submerged in water.

[0024] (2) Normal operation:

[0025] Hot medium flow: High-temperature hot water or steam enters from the hot water inlet flange 1, flows through the water pipe 6, and flows out from the hot water outlet flange 4.

[0026] Liquid seal maintenance: If the liquid seal level drops due to evaporation or leakage, the float valve 16 will automatically open to replenish water into the tank through the water supply pipe 17 until the water level is restored. If too much water is added, the excess water will be discharged from the overflow pipe (9) to ensure a constant water level.

[0027] Gas management: Nitrogen gas is introduced from the inlet flange 2 into the ventilation pipe 3. The nitrogen gas will flow downward through the ventilation pipe 3 and be discharged from the 20 exhaust holes 21 of the exhaust base 14, and then enter the space above the liquid seal water through the gap of the serrated base plate.

[0028] (3) Maintenance or emptying: When maintenance or cleaning is required, close all inlet and outlet valves and open the valve of the drain flange (13) to completely empty the liquid seal water in the tank.

[0029] By adding a 200mm serrated bottom plate to the liquid seal opening of the liquid seal tank and drilling 20 12mm holes in the bottom plate, nitrogen consumption was reduced from 5 Nm³ / h to 2 Nm³ / h, and water consumption was reduced from 3 T / h to 0.5 T / h. This not only reduced production costs but also greatly improved environmental protection.

[0030] In summary, this liquid-sealed tank structure for storage tanks allows hot water to enter through the inlet pipe and exit through the outlet pipe via internal water pipes, thus achieving heat transfer or hot water supply. A certain height of liquid-sealed water inside the tank isolates the water pipes from the external atmosphere, preventing gas from leaking into the environment from the end of the water pipes.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A liquid seal tank structure for a storage tank, characterized in that: The system includes a liquid seal tank (10), with an end cap (7) at the upper end of the liquid seal tank (10). A water pipe (6) is provided inside the liquid seal tank (10) that passes through the end cap (7) and extends out of the end cap (7). A water inlet pipe (15) is provided at the lower part of the water pipe (6) that extends to the top of the end cap (7). A water outlet pipe (5) is provided above the end cap (7) that is connected to the upper part of the water inlet pipe (15). A vent pipe (3) is provided inside the water pipe (6) that is not connected to the water pipe (6) and extends out of both ends of the water pipe (6). An exhaust base (14) is provided at the lower end of the vent pipe (3).

2. The liquid seal tank structure for a storage tank according to claim 1, characterized in that: The upper end of the ventilation pipe (3) is provided with an air inlet flange (2); the front end of the water inlet pipe (15) is provided with a hot water inlet flange (1); the front end of the water outlet pipe (5) is provided with a hot water outlet flange (4).

3. The liquid seal tank structure for a storage tank according to claim 1, characterized in that: The exhaust base (14) includes a serrated base plate (20), and an integrally welded reducer (19) is provided between the serrated base plate (20) and the ventilation pipe (3). The serrated base plate (20) is provided with a plurality of exhaust holes (21).

4. The liquid seal tank structure for a storage tank according to claim 1, characterized in that: The liquid seal tank (10) is provided with a water supply pipe (17) on one side of the upper part, and a water supply flange (18) is provided at the front end of the water supply pipe (17); the liquid seal tank (10) is provided with an overflow pipe (9) higher than the water supply pipe (17) on the other side of the upper part, and an overflow flange (8) is provided at the front end of the overflow pipe (9).

5. A liquid seal tank structure for a storage tank according to claim 4, characterized in that: The liquid seal tank (10) is equipped with a float valve (16) that is inserted into the water supply pipe (17).

6. The liquid seal tank structure for a storage tank according to claim 1, characterized in that: The liquid seal tank (10) is provided with a drain flange (13) at the lower end, and a drain pipe (12) is provided between the drain flange (13) and the liquid seal tank (10).

7. A liquid seal tank structure for a storage tank according to claim 1, characterized in that: The liquid seal tank (10) is provided with several ring-shaped support legs (11) on its lower periphery.

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