Normal pressure storage tank purging structure

Abstract

The utility model relates to the technical field of coal tar processing, in particular to an atmospheric storage tank purging structure. In order to solve the problem that sudden boiling or condensed water accumulation in a storage tank is easily caused by an existing reverse steam blowing structure, the novel normal-pressure storage tank blowing structure comprises the storage tank, a packed tower, a centrifugal pump and a backflow pipe, an input pipe opening of the centrifugal pump is communicated with a discharging pipe opening of the storage tank, an output pipe opening of the centrifugal pump is communicated with a feeding pipe opening of the packed tower, and the backflow pipe is communicated with the storage tank. The two ends of the centrifugal pump are connected with bypass pipes in parallel, the inlet end of the backflow pipe is communicated with a discharging pipe opening of the storage tank, the outlet end of the backflow pipe is communicated to the upper portion in the storage tank, the backflow pipe is provided with a backflow valve, the feeding pipe is provided with a steam blowing pipe opening, and the steam blowing pipe opening is provided with a blowing valve. According to the structure, sudden boiling and condensed water accumulation in the storage tank can be avoided to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of coal tar processing, especially to the technical field of material conveying, and specifically relates to a purge structure for an atmospheric storage tank. Background Art

[0002] Most of the materials processed in chemical production are fluids. Conveying these materials between various chemical equipment and machines according to process requirements is an important link in realizing chemical production. There are many types of materials in chemical production, and the characteristics of the conveyed fluids, such as density, viscosity, toxicity, corrosiveness, flammability, and explosiveness, are different. Therefore, in chemical production, fluids are mostly conveyed through closed pipelines. After the material conveying is completed, it will be decided whether to purge the pipeline according to the characteristics of the material. In the coal tar processing industry, from raw materials to products, there are situations where the pipelines are prone to crystallization and solidification blockage. Therefore, it is necessary to purge the pipelines, and the most commonly used is steam purging.

[0003] Steam purging is purging with steam of different parameters. It has a very high purging speed, and the intermittent steam purging method can cause the pipeline to peel off the attachments on the inner wall of the pipeline through thermal expansion and contraction, and purge the material in the pipeline to the target container to achieve the best purging effect.

[0004] In the existing production process, the storage tank conveys materials to the packed tower through a centrifugal pump. After the material conveying is completed, it is often impossible to purge steam into the packed tower due to metering or some other factors. At this time, only reverse steam purging can be carried out. For some high-temperature storage tanks, reverse steam purging is likely to cause sudden boiling in the storage tank, and in severe cases, it will cause the storage tank to burst, with great potential safety hazards. For some low-temperature storage tanks, reverse purging is likely to cause condensate to accumulate in the storage tank, affecting product quality. Summary of the Invention

[0005] In order to solve the problem that the existing reverse steam purge structure is prone to cause sudden boiling or condensate accumulation in the storage tank, the utility model provides a new purge structure for an atmospheric storage tank.

[0006] The utility model is realized by adopting the following technical scheme:

[0007] An atmospheric storage tank purging structure includes a storage tank, a packing tower, a centrifugal pump, and a reflux pipe. There is a discharge pipe orifice at the lower part of the storage tank, and a tail gas outlet at the top of the storage tank. There is a feed pipe orifice on the packing tower. The centrifugal pump has an input pipe orifice and an output pipe orifice. The input pipe orifice of the centrifugal pump is connected to the discharge pipe orifice of the storage tank through a discharge pipe, and the output pipe orifice of the centrifugal pump is connected to the feed pipe orifice of the packing tower through a feed pipe. A bypass pipe is connected in parallel at both ends of the centrifugal pump, and the bypass pipe is equipped with a bypass valve. The discharge pipe orifice of the storage tank is equipped with a discharge valve, the input pipe orifice of the centrifugal pump is equipped with an inlet valve, the output pipe orifice of the centrifugal pump is equipped with an outlet valve, the feed pipe orifice of the packing tower is equipped with a feed valve. The inlet end of the reflux pipe is connected to the discharge pipe orifice of the storage tank, and the outlet end of the reflux pipe leads into the upper part inside the storage tank. The part of the reflux pipe located outside the storage tank is equipped with a reflux valve. The feed pipe is equipped with a steam purging pipe orifice, and the steam purging pipe orifice is equipped with a purging valve.

[0008] Working process: When the material is being transported normally, open the discharge valve, inlet valve, outlet valve, and feed valve, close the bypass valve, reflux valve, and purging valve. The material sequentially passes through the discharge pipe orifice of the storage tank, the discharge pipe, the centrifugal pump, and the feed pipe and then enters the packing tower. When pressure adjustment is required, open the bypass valve. After the material transportation is completed, close the discharge valve, inlet valve, outlet valve, and feed valve, open the reflux valve, purging valve, and bypass valve. The steam is reverse purged from the steam purging port and then sequentially passes through the feed pipe, bypass pipe, discharge pipe, and reflux pipe and then enters the upper part inside the storage tank. Finally, the purged and dropped material falls to the bottom of the storage tank due to gravity, while the steam is discharged from the tail gas outlet of the storage tank and enters the tail gas system. In this way, the boiling over and condensate accumulation inside the storage tank can be avoided to the greatest extent, thereby eliminating potential safety hazards and ensuring product quality.

[0009] Furthermore, the inlet end of the reflux pipe, the end of the discharge pipe close to the storage tank, and the discharge pipe orifice of the storage tank are connected through a tee pipe, making the structure more specific and standardized.

[0010] Furthermore, the reflux pipe includes a vertical pipe, a horizontal pipe, and a vertical pipe. The bottom port of the vertical pipe is connected to the corresponding pipe orifice of the tee pipe, the top port of the vertical pipe is connected to one end of the horizontal pipe, the other end of the horizontal pipe horizontally leads into the lower part inside the storage tank and is connected to the bottom port of the vertical pipe, and the top port of the vertical pipe vertically leads into the upper part inside the storage tank. The structure of the reflux pipe is more specific and standardized, and the reflux pipe of this structure can make it more convenient for the purging steam to be discharged from the tail gas outlet.

[0011] The beneficial effects produced by the present utility model are as follows: The atmospheric storage tank purging structure of the present utility model ingeniously leads the reflux pipe into the upper part inside the storage tank, so that the purged and shed material and steam enter the upper part inside the storage tank after purging, which is convenient for the steam to be discharged from the tail gas outlet of the storage tank and enter the tail gas system. In this way, the boiling over and condensate accumulation inside the storage tank can be avoided to the greatest extent, thereby eliminating potential safety hazards and ensuring product quality. Description of the Drawings

[0012] The accompanying drawings here are incorporated into the description and form a part of this description, showing the embodiments in line with the present utility model, and are used together with the description to explain the principles of the present utility model.

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the accompanying drawings required for use in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0015] In the figure: 1 - storage tank, 2 - discharge pipe orifice, 3 - tail gas outlet, 4 - centrifugal pump, 5 - packing tower, 6 - reflux pipe, 61 - vertical pipe, 62 - horizontal pipe, 63 - vertical pipe, 7 - feed pipe orifice, 8 - discharge pipe, 9 - feed pipe, 10 - bypass pipe, 11 - bypass valve, 12 - discharge valve, 13 - inlet valve, 14 - outlet valve, 15 - feed valve, 16 - reflux valve, 17 - steam purging pipe orifice, 18 - purging valve. Detailed implementation manners

[0016] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the solution of the present utility model will be further described below. It should be noted that, without conflict, the embodiments of the present utility model and the features in the embodiments can be combined with each other.

[0017] In the description, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0018] Many specific details are set forth in the following description in order to fully understand the present utility model, but the present utility model can also be implemented in other ways different from those described herein; obviously, the embodiments in the description are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0019] The specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0020] As shown Figure 1 in the figure, an atmospheric storage tank purging structure includes a storage tank 1, a packing tower 5, a centrifugal pump 4, and a reflux pipe 6. An outlet pipe orifice 2 is provided at the lower part of the storage tank 1, and a tail gas outlet 3 is provided at the top of the storage tank 1. A feed pipe orifice 7 is provided on the packing tower 5. The centrifugal pump 4 is provided with an input pipe orifice and an output pipe orifice. The input pipe orifice of the centrifugal pump 4 is communicated with the outlet pipe orifice 2 of the storage tank 1 through an outlet pipe 8, and the output pipe orifice of the centrifugal pump 4 is communicated with the feed pipe orifice 7 of the packing tower 5 through a feed pipe 9. A bypass pipe 10 is connected in parallel at both ends of the centrifugal pump 4. The bypass pipe 10 is provided with a bypass valve 11. The outlet pipe orifice 2 of the storage tank 1 is provided with an outlet valve 12. The input pipe orifice of the centrifugal pump 4 is provided with an inlet valve 13. The output pipe orifice of the centrifugal pump 4 is provided with an outlet valve 14. The feed pipe orifice 7 of the packing tower 5 is provided with a feed valve 15. The inlet end of the reflux pipe 6 is communicated with the outlet pipe orifice 2 of the storage tank 1, and the outlet end of the reflux pipe 6 leads into the upper part inside the storage tank 1. The part of the reflux pipe 6 located outside the storage tank 1 is provided with a reflux valve 16. The feed pipe 9 is provided with a steam purging pipe orifice 17, and the steam purging pipe orifice 17 is provided with a purging valve 18.

[0021] Working process: When the material is being transported normally, open the outlet valve 12, inlet valve 13, outlet valve 14, and feed valve 15, close the bypass valve 11, close the reflux valve 16 and purging valve 18. The material sequentially passes through the outlet pipe orifice 2 of the storage tank 1, outlet pipe 8, centrifugal pump 4, and feed pipe 9 and then enters the packing tower 5. When pressure adjustment is needed, open the bypass valve 11; after the material transportation is completed, close the outlet valve 12, inlet valve 13, outlet valve 14, and feed valve 15, open the reflux valve 16, purging valve 18, and bypass valve 11. The steam is purged in the reverse direction from the steam purging orifice and then sequentially passes through the feed pipe 9, bypass pipe 10, outlet pipe 8, and reflux pipe 6 and then enters the upper part inside the storage tank 1. Finally, the material purged and dropped falls to the bottom of the storage tank 1 due to gravity, while the steam is discharged from the tail gas outlet 3 of the storage tank 1 and enters the tail gas system. In this way, the boiling over and condensate accumulation inside the storage tank 1 can be avoided to the greatest extent, thereby eliminating potential safety hazards and ensuring product quality.

[0022] During specific implementation, the inlet end of the reflux pipe 6, the end of the outlet pipe 8 close to the storage tank 1, and the outlet pipe orifice 2 of the storage tank 1 are communicated through a tee pipe, making the structure specific and standardized.

[0023] During specific implementation, the reflux pipe 6 includes a vertical pipe 61, a horizontal pipe 62, and a vertical pipe 63. The bottom port of the vertical pipe 61 is communicated with the corresponding pipe orifice of the tee pipe. The top port of the vertical pipe 61 is communicated with one end of the horizontal pipe 62. The other end of the horizontal pipe 62 horizontally leads into the lower part inside the storage tank 1 and is communicated with the bottom port of the vertical pipe 63. The top port of the vertical pipe 63 vertically leads into the upper part inside the storage tank 1. The structure of the reflux pipe 6 is specific and standardized, and the reflux pipe 6 with this structure can more conveniently discharge the steam for backwashing from the tail gas outlet 3.

[0024] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Although the foregoing embodiments have been described in detail, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments, and they should all be covered by the protection scope of the claims.

Claims

1. A normal pressure storage tank purging structure, characterized in that: The invention comprises a storage tank (1), a packing tower (5), a centrifugal pump (4), and a reflux pipe (6). The storage tank (1) is provided with a discharge pipe opening (2) at the bottom, an exhaust gas outlet (3) at the top, a feed pipe opening (7) at the packing tower (5), an input pipe opening and an output pipe opening at the centrifugal pump (4), the input pipe opening of the centrifugal pump (4) is connected to the discharge pipe opening (2) of the storage tank (1) via a discharge pipe (8), the output pipe opening of the centrifugal pump (4) is connected to the feed pipe opening (7) of the packing tower (5) via a feed pipe (9), bypass pipes (10) are connected in parallel at both ends of the centrifugal pump (4), and the bypass pipe (10) is provided with a bypass valve (11). The discharge pipe opening (2) of the storage tank (1) is provided with a discharge valve (12), the input pipe opening of the centrifugal pump (4) is provided with an inlet valve (13), the output pipe opening of the centrifugal pump (4) is provided with an outlet valve (14), the feed pipe opening (7) of the packing tower (5) is provided with a feed valve (15), the inlet end of the reflux pipe (6) is connected to the discharge pipe opening (2) of the storage tank (1), the outlet end of the reflux pipe (6) leads to the upper part of the storage tank (1), the part of the reflux pipe (6) located outside the storage tank (1) is provided with a reflux valve (16), the feed pipe (9) is provided with a steam purge pipe opening (17), and the steam purge pipe opening (17) is provided with a purge valve (18).

2. The atmospheric pressure storage tank purging structure according to claim 1, characterized in that: The inlet end of the reflux pipe (6), one end of the discharge pipe (8) close to the storage tank (1), and the discharge pipe opening (2) of the storage tank (1) are connected via a three-way pipe.

3. A normal pressure storage tank purging structure according to claim 1 or 2, characterized in that: The return pipe (6) comprises a vertical pipe (61), a horizontal pipe (62) and a vertical pipe (63); the bottom end of the vertical pipe (61) is connected to a corresponding pipe end of the three-way pipe; the top end of the vertical pipe (61) is connected to one end of the horizontal pipe (62); the other end of the horizontal pipe (62) is horizontally passed into the lower part of the storage tank (1) and is connected to the bottom end of the vertical pipe (63); the top end of the vertical pipe (63) is vertically passed upward into the upper part of the storage tank (1).

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