Novel online backwashing desulfurization tower bottom filter

Abstract

The utility model discloses a novel online backwash desulfurization tower bottom filter, which comprises a desulfurization tower, a filter is arranged at the inner bottom of the desulfurization tower, a semi-water gas tower inlet pipe is arranged on one side of the desulfurization tower and above the filter, the upper end of the filter is fixedly connected with a first desulfurization liquid pipe, and the lower end of the filter is fixedly connected with a second desulfurization liquid pipe. One end, far away from the filter, of the first desulfurization liquid pipe penetrates through the exterior of the desulfurization tower and is connected with a rich liquid pump; compared with the prior art, in order to ensure the stability of liquid phase flow of the desulfurizing tower and further stabilize hydrogen sulfide at a tower outlet within an index, the aim of cleaning and dredging blockage of the filter at the bottom of the desulfurizing tower is fulfilled by utilizing the principle of reverse flow of desulfurizing liquid, the filter at the bottom of the desulfurizing tower is generally blocked by sulfur, original equipment is not changed, the structure is simple, and the cost is low. The device is convenient to operate and remarkable in effect, reduces environmental pollution, guarantees long-period stable operation of the technology, and can be widely applied to similar backwashing equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of desulfurization towers, in particular to a new type of on-line backwashing bottom filter for desulfurization towers. Background Technique

[0002] Energy conservation and consumption reduction are the fundamental of an enterprise's competitiveness, and maintaining the long-term safe and stable operation of production equipment is an effective way to achieve energy conservation and consumption reduction. However, for fixed-bed synthetic ammonia, the stable operation of the desulfurization process is particularly crucial. It is the first process for purifying process gas in the synthetic ammonia process. The desulfurization method used is the wet oxidation method, and a packed desulfurization tower is configured. Its process is mature, but due to the influence of many factors such as the quality of semi-water gas and the regeneration of desulfurization liquid, for many years, the blockage of the desulfurization tower packing and the increase in pressure difference have always been difficult problems, and it is common to remove the packing. In some cases, forced shutdowns are even required to clear the blockage, resulting in a large amount of waste of manpower and material resources and environmental pollution.

[0003] In the face of the increasing resistance of the desulfurization tower, through continuous exploration, we found that the current of the desulfurization rich liquid pump always shows a continuous downward trend, and the regeneration pressure also continuously decreases. Over time, the circulation volume of the desulfurization liquid continuously decreases, which in turn causes the blockage of the desulfurization tower packing, an increase in pressure difference, and an increase in energy consumption. Therefore, the utility model proposes a new type of on-line backwashing bottom filter for desulfurization towers. Content of the Utility Model

[0004] The purpose of the utility model is to provide a new type of on-line backwashing bottom filter for desulfurization towers to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A new type of on-line backwashing bottom filter for desulfurization towers, including a desulfurization tower. A filter is arranged at the bottom inside the desulfurization tower. A semi-water gas inlet pipe is installed above the filter on one side of the desulfurization tower. The upper end of the filter is fixedly connected with a first desulfurization liquid pipe. The end of the first desulfurization liquid pipe away from the filter penetrates to the outside of the desulfurization tower and is connected with a rich liquid pump. One side of the rich liquid pump away from the first desulfurization liquid pipe is connected with a regeneration tank. One side of the regeneration tank away from the rich liquid pump is connected with a lean liquid tank. One side of the lean liquid tank away from the regeneration tank is connected with a lean liquid pump. A desulfurization lean liquid inlet pipe is connected between the lean liquid pump and the desulfurization tower. An anti-flushing pipe is connected between the desulfurization lean liquid inlet pipe and the first desulfurization liquid pipe, and an anti-flushing valve is installed on the anti-flushing pipe.

[0006] As a preferred technical solution of the utility model, the rich liquid pump and the regeneration tank are connected and communicated through a second desulfurization liquid pipe.

[0007] As a preferred technical solution of the utility model, the regeneration tank and the lean liquid tank are connected and communicated through a first lean liquid pipe.

[0008] As a preferred technical solution of the present utility model, the lean liquid tank and the lean liquid pump are connected and communicated through a second lean liquid pipe.

[0009] As a preferred technical solution of the present utility model, pipeline valves are provided on the first desulfurized liquid pipe, the second desulfurized liquid pipe, the first lean liquid pipe, the second lean liquid pipe, and the desulfurized lean liquid inlet tower pipe.

[0010] As a preferred technical solution of the present utility model, the desulfurized lean liquid inlet tower pipe is installed at the top position of one side wall of the desulfurization tower.

[0011] As a preferred technical solution of the present utility model, a semi-water gas outlet tower pipe is fixedly installed at the upper end of the desulfurization tower.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] For a novel on-line backwashing filter at the bottom of the desulfurization tower of the present utility model, in order to ensure the stability of the liquid phase flow rate of the desulfurization tower and thus achieve the stability of the hydrogen sulfide at the tower outlet within the index, the principle of reverse flow of the desulfurized liquid is utilized to achieve the purpose of cleaning and dredging the blockage of the filter at the bottom of the desulfurization tower. The filter at the bottom of the desulfurization tower is generally blocked by sulfur, and the original equipment is not changed. The structure is simple, the operation is convenient, the effect is remarkable, the environmental pollution is reduced, the long-term stable operation of the technology is ensured, and it can be widely used in similar backwashing equipment.

[0014] Other features and advantages of the present utility model will be described in detail in the subsequent specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0016] In the figure: 1. Desulfurization tower; 2. Filter; 3. Semi-water gas inlet tower pipe; 4. Semi-water gas outlet tower pipe; 5. First desulfurized liquid pipe; 6. Rich liquid pump; 7. Lean liquid pump; 8. Backwashing pipe; 9. Backwashing valve; 10. Desulfurized lean liquid inlet tower pipe; 11. Regeneration tank; 12. Second desulfurized liquid pipe; 13. Lean liquid tank; 14. First lean liquid pipe; 15. Second lean liquid pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0019] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" 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 in the present utility model can be understood according to specific circumstances.

[0020] Please refer to Figure 1, in this embodiment, a new type of online backwashing desulfurization tower bottom filter is provided, which includes a desulfurization tower 1. A filter 2 is arranged at the inner bottom position of the desulfurization tower 1. A semi-water gas inlet pipe 3 is installed above the filter 2 on one side of the desulfurization tower 1. A semi-water gas outlet pipe 4 is fixedly installed at the upper end of the desulfurization tower 1. The upper end of the filter 2 is fixedly connected with a first desulfurization liquid pipe 5. One end of the first desulfurization liquid pipe 5 far away from the filter 2 penetrates to the outside of the desulfurization tower 1 and is connected with a rich liquid pump 6. One side of the rich liquid pump 6 far away from the first desulfurization liquid pipe 5 is connected with a regeneration tank 11. The rich liquid pump 6 and the regeneration tank 11 are connected and communicated through a second desulfurization liquid pipe 12. One side of the regeneration tank 11 far away from the rich liquid pump 6 is connected with a lean liquid tank 13. The regeneration tank 11 and the lean liquid tank 13 are connected and communicated through a first lean liquid pipe 14. One side of the lean liquid tank 13 far away from the regeneration tank 11 is connected with a lean liquid pump 7. The lean liquid tank 13 and the lean liquid pump 7 are connected and communicated through a second lean liquid pipe 15. A desulfurization lean liquid inlet tower pipe 10 is connected between the lean liquid pump 7 and the desulfurization tower 1. Pipeline valves are arranged on the first desulfurization liquid pipe 5, the second desulfurization liquid pipe 12, the first lean liquid pipe 14, the second lean liquid pipe 15 and the desulfurization lean liquid inlet tower pipe 10. The desulfurization lean liquid inlet tower pipe 10 is installed at the top position of one side wall of the desulfurization tower 1. An anti-flushing pipe 8 is connected between the desulfurization lean liquid inlet tower pipe 10 and the first desulfurization liquid pipe 5. An anti-flushing valve 9 is installed on the anti-flushing pipe 8. During the normal production process with existing equipment, the bottom filter 2 of the desulfurization tower can be backwashed without stopping the device for cleaning. It is not only simple to operate, but also does not affect the operation of the device, and can meet the production requirements, realizing the long-term stable operation of the device. It can be implemented during the technical operation process without stopping. Using the existing operating equipment, a part of the desulfurization liquid at the outlet of the desulfurization lean liquid pump 7 with a pressure of 0.8 Mpa is incorporated into the pipeline at the inlet of the desulfurization rich liquid pump 6 with a pressure of 40 kpa. The anti-flushing valve 9 on the anti-flushing pipe 8 can perform a good backwash on the first desulfurization liquid pipe 5 and the filter 2. Among them, one end of the anti-flushing pipe 8 is installed at the liquid outlet of the lean liquid pump 7, and the other end is installed at the liquid inlet of the rich liquid pump 6. Online backwashing is carried out during the normal operation of the technology without changing the process operation parameters. It is simple to operate, and the desulfurization liquid is not likely to overflow, avoiding environmental pollution.

[0021] The specific working principle is as follows. In the desulfurization tower 1, the liquid and gas are in reverse contact to absorb hydrogen sulfide in the gas phase, and part of it generates sulfur paste. Over time, it accumulates and blocks at the bottom filter 2 of the desulfurization tower 1, resulting in an inability to increase the desulfurization liquid circulation volume, a high hydrogen sulfide content at the tower outlet. A part of the desulfurization liquid at the outlet of the desulfurization lean liquid pump 7 enters the bottom filter 2 of the tower from the liquid phase outlet of the tower for reverse flushing. During the flushing process, not only can the sulfur paste be flushed open, but also the sulfur paste can be broken up. When the backwashing ends and the normal production is resumed, the broken sulfur paste can be taken out of the tower bottom through the filter 2, enter the regeneration tank 11 through the desulfurization rich liquid pump 6, and the sulfur paste is flotation-separated. Then, the sulfur paste is compacted by a filter press to recover the desulfurization liquid in the sulfur paste, and the sulfur paste enters a sulfur melting kettle to be boiled into block-shaped sulfur products.

[0022] It should be noted that: First of all, for the bottom filter of the new type of on-line backwashing desulfurization tower, the installation can be completely realized during the technical operation by means of pressure tapping, without the need to stop the operation for installation.

[0023] Secondly, for the bottom filter of the new type of on-line backwashing desulfurization tower, by using the existing rich and lean desulfurization pumps during operation and directly adjusting through valves, there is no need to stop the rich desulfurization liquid pump 6. Instead, a new lean desulfurization liquid pump 7 is used to pour from the outlet of the rich desulfurization liquid pump 6 into the inlet pipeline to backwash the bottom filter 2 of the desulfurization tower, thus solving the problem of blockage of the filter 2.

[0024] Moreover, the bottom filter of the new type of on-line backwashing desulfurization tower can be used in supporting with any filter 2 having a similar structural form at the bottom of the absorption tower.

[0025] Finally, the bottom filter of the new type of on-line backwashing desulfurization tower makes full use of the existing equipment, with less investment and greater benefits, realizing simple operation, relatively stable process control, and avoiding the leakage of desulfurization liquid.

[0026] Thus, it can be seen that for the bottom filter of the backwashing desulfurization tower of the present utility model, in order to ensure the stability of the liquid phase flow rate of the desulfurization tower and further keep the hydrogen sulfide at the tower outlet stable within the specified index, by using the principle of reverse flow of the desulfurization liquid, the purpose of cleaning and dredging the blockage (sulfur blockage) of the bottom filter 2 of the desulfurization tower is achieved. Without changing the original equipment, it has a simple structure, convenient operation, remarkable effect, reduces environmental pollution, ensures the long-term stable operation of the technology, and can be widely used in similar backwashing equipment.

[0027] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A novel online backwashing bottom filter for a desulfurization tower, characterized in that, It includes a desulfurization tower (1), a filter (2) is arranged at the inner bottom position of the desulfurization tower (1), a semi-water gas inlet pipe (3) is installed above the filter (2) on one side of the desulfurization tower (1), the upper end of the filter (2) is fixedly connected with a first desulfurization liquid pipe (5), one end of the first desulfurization liquid pipe (5) far from the filter (2) penetrates to the outside of the desulfurization tower (1) and is connected with a rich liquid pump (6), one side of the rich liquid pump (6) far from the first desulfurization liquid pipe (5) is connected with a regeneration tank (11), one side of the regeneration tank (11) far from the rich liquid pump (6) is connected with a lean liquid tank (13), one side of the lean liquid tank (13) far from the regeneration tank (11) is connected with a lean liquid pump (7), a desulfurized lean liquid inlet pipe (10) is connected between the lean liquid pump (7) and the desulfurization tower (1), a backwash pipe (8) is connected between the desulfurized lean liquid inlet pipe (10) and the first desulfurization liquid pipe (5), and a backwash valve (9) is installed on the backwash pipe (8).

2. The novel online backwashing desulfurization tower bottom filter according to claim 1, wherein The rich liquid pump (6) and the regeneration tank (11) are communicated with each other through a second desulfurization liquid pipe (12).

3. The novel online backwashing desulfurization tower bottom filter according to claim 2, wherein The regeneration tank (11) and the lean liquid tank (13) are communicated with each other through a first lean liquid pipe (14).

4. A novel online backwashing bottom filter for a desulfurization tower according to claim 3, characterized in that, The lean liquid tank (13) and the lean liquid pump (7) are communicated with each other through a second lean liquid pipe (15).

5. A novel on-line backwashing desulfurization tower bottom filter according to claim 4, characterized in that, Pipeline valves are provided on the first desulfurization liquid pipe (5), the second desulfurization liquid pipe (12), the first lean liquid pipe (14), the second lean liquid pipe (15) and the desulfurized lean liquid inlet pipe (10).

6. The novel online backwashing desulfurization tower bottom filter according to claim 1, characterized in that The desulfurized lean liquid inlet pipe (10) is installed at the top position of one side wall of the desulfurization tower (1).

7. A novel on-line backwashing desulfurization tower bottom filter according to claim 1, characterized in that, A semi-water gas outlet pipe (4) is fixedly installed at the upper end of the desulfurization tower (1).

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