Anti-freezing device for flushing water pipeline of demister of desulfurizing tower

Abstract

The utility model discloses an anti-freezing device for a flushing water pipeline of a demister of a desulfurizing tower, which comprises a process water tank arranged indoors, a plurality of water supply pipelines are arranged on the process water tank, a water pump is arranged on each water supply pipeline, each water supply pipeline is respectively communicated with a flushing pipeline used for flushing the demister of the desulfurizing tower, and the flushing pipeline is communicated with the demister of the desulfurizing tower. A first check valve is arranged at the connecting position of each water supply pipeline and the corresponding flushing pipeline, water return pipelines are arranged at the positions, located at the two ends of the first check valves, between the water supply pipelines and the flushing pipelines in a communicating mode, and the inner diameter of the water return pipelines is smaller than that of the water supply pipelines. Water in the flushing pipeline can flow back to the indoor process water tank through the water return pipeline, so that the water in the flushing pipeline is emptied to prevent low-temperature freezing; in addition, the water return pipeline can effectively reduce the flow in the water backflow process, so that the water pump is prevented from reversing, and the purpose of protecting the water pump is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary flushing equipment for desulfurization tower demisters, and in particular to an antifreeze device for flushing water pipelines of desulfurization tower demisters. Background Technology

[0002] Desulfurization towers are crucial equipment in flue gas treatment systems of heat source plants, power plants, and coking plants. Demisters are an essential component of desulfurization towers, playing a vital role in the desulfurization system. Their main functions include removing droplets and particulate matter from the flue gas to ensure emissions meet environmental standards. During prolonged operation, desulfurization tower demisters may experience particulate matter adhesion and capillary blockage, leading to excessive emissions in the flue gas exiting the tower and reducing desulfurization efficiency. Therefore, regular flushing of the desulfurization tower demister is necessary. The main purpose is to remove particulate matter from the demister, reduce its resistance to flue gas, and thus improve desulfurization efficiency.

[0003] The flushing operation of the desulfurization tower demister is a timed flushing process. To prevent backflow of flushing water from the pipeline during off-peak hours, which could cause the pump to reverse, and to avoid damage to the pump from scale and other impurities in the return water, a check valve needs to be installed at the pump outlet. Since the water in the pipeline remains stagnant during non-flushing periods, electric heating tape is typically used for insulation in winter. However, due to the high installation height of the demister and the long flushing pipeline, a large amount of heating tape needs to be wrapped, which can easily lead to localized damage and loss of antifreeze effect. To solve these problems, it is necessary to design a new and more effective antifreeze device. Utility Model Content

[0004] The purpose of this invention is to provide an antifreeze device for the flushing water pipeline of the desulfurization tower demister, thereby solving the technical problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model discloses an antifreeze device for the flushing water pipeline of a desulfurization tower demister, comprising a process water tank installed indoors, multiple water supply pipelines installed on the process water tank, each water supply pipeline being equipped with a water pump, each water supply pipeline being connected to a flushing pipeline used for flushing the desulfurization tower demister, and a first check valve being installed at the connection point between each water supply pipeline and the corresponding flushing pipeline, and a return water pipeline being connected between the water supply pipeline and the flushing pipeline at both ends of the first check valve, the inner diameter of the return water pipeline being smaller than the inner diameter of the water supply pipeline.

[0007] Furthermore, the specific model of the return water pipe is DN15.

[0008] Furthermore, a second check valve is provided at the connection points of the return water pipe with the water supply pipe and the flushing pipe, respectively.

[0009] Furthermore, the return water pipe includes a first return water pipe connected to the water supply pipe and a second return water pipe connected to the flushing pipe, and a quick-release filter assembly is provided at the connection between the first return water pipe and the second return water pipe.

[0010] Furthermore, the quick-release filter assembly includes a filter mechanism disposed at the end of the first return water pipe and a connecting mechanism disposed at the end of the second return water pipe. The filter mechanism includes a support ring disposed on the outer end face of the first return water pipe, and a filter screen is fixedly disposed inside the support ring. The connecting mechanism includes a connector fixedly disposed at the end of the second return water pipe, the end of the connector away from the second return water pipe being connected to one end of a retractable corrugated pipe, and a limiting head fixedly disposed at the end of the corrugated pipe away from the connector. The limiting head and the corrugated pipe share a common feature. The device is equipped with a connecting sleeve. The upper top plate of the connecting sleeve has a through hole with an inner diameter larger than the outer diameter of the corrugated pipe. The outer diameters of the connector and the limiting head are both larger than the inner diameter of the through hole. The lower end of the connecting sleeve is an open structure and has an internal thread on its inner circumferential wall. The outer circumferential wall of the end of the first return water pipe has an external thread that matches the internal thread of the connecting sleeve. After the connecting sleeve is fully threadedly connected to the first return water pipe, the lower surface of its top plate abuts against the upper surface of the limiting head, and the lower surface of the limiting head abuts against the upper surface of the support ring.

[0011] Furthermore, sealing rings are respectively provided between the support ring and the first return water pipe and the limiting head.

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

[0013] This invention connects the water supply pipe and the flushing pipe via a return water pipe. After the demister flushing is completed and the water pump is turned off, the water in the outdoor high-altitude flushing pipe can flow back through the return water pipe, bypassing the first check valve, to the indoor process water tank, thereby emptying the water in the flushing pipe and preventing low-temperature freezing. Furthermore, because the return water pipe has a small inner diameter, the flow rate during the water return process is effectively reduced, thus preventing the water pump from reversing and protecting it. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings.

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

[0016] Figure 2 This is a schematic diagram of the quick-release filter assembly structure according to Embodiment 2 of this utility model;

[0017] Figure 3 This is a schematic diagram of the filtration mechanism according to Embodiment 2 of this utility model;

[0018] Figure 4 This is a schematic diagram of the connection mechanism in Embodiment 2 of this utility model;

[0019] Explanation of reference numerals in the attached drawings: 1. Process water tank; 2. Water supply pipe; 3. Water pump; 4. Flushing pipe; 5. First check valve; 6. Return water pipe; 7. Second check valve; 8. First return water pipe; 9. Second return water pipe; 10. Support ring; 11. Filter screen; 12. Connector; 13. Corrugated pipe; 14. Limiting head; 15. Connecting sleeve; 16. Sealing ring. Detailed Implementation

[0020] Example 1

[0021] like Figure 1 As shown, an antifreeze device for the flushing water pipeline of a desulfurization tower demister includes an indoor process water tank 1. Multiple water supply pipes 2 are installed on the process water tank 1 and connected to its interior. Each water supply pipe 2 is equipped with a water pump 3. Each water supply pipe 2 is connected to a flushing pipeline 4 used for flushing the desulfurization tower demister. A first check valve 5 is installed at the connection point between each water supply pipe 2 and the corresponding flushing pipeline 4. When the demister needs flushing, the water pump 3 is activated, and process water from the process water tank is transferred to the flushing pipeline 4 via the water supply pipes 2 for flushing the outdoor desulfurization tower demister. After flushing, the water pump 3 is turned off. The first check valve 5 controls that process water can only flow from the water supply pipes 2 to the flushing pipeline 4, preventing water in the flushing pipeline 4 from flowing back into the water supply pipes 2, thus avoiding damage to the pump body due to pump reversal caused by process water backflow.

[0022] In this embodiment, a return water pipe 6 is installed between the water supply pipe 2 and the flushing pipe 4 at both ends of the first check valve 5. The inner diameter of the return water pipe 6 is much smaller than that of the water supply pipe 2; specifically, the return water pipe 6 is DN15. A second check valve 7 is installed at the connection points of the return water pipe 6 with the water supply pipe 2 and the flushing pipe 4. The two second check valves 7 control the flow of process water to be directed only along the flushing pipe, the return water pipe, and the water supply pipe. After the demister flushing is completed and the water pump is turned off, the water in the outdoor high-altitude flushing pipe can flow back through the return water pipe, bypassing the first check valve, to the indoor process water tank, thereby emptying the water in the flushing pipe and preventing low-temperature freezing. Furthermore, due to the smaller inner diameter of the return water pipe, the flow rate during the water return process is effectively reduced, thus preventing the water pump from reversing.

[0023] Example 2

[0024] This embodiment further optimizes the structure of the return water pipe without changing other structures in Embodiment 1, such as... Figures 2-4 As shown, the return water pipe 6 includes a first return water pipe 8 connected to the water supply pipe 2 and a second return water pipe 9 connected to the flushing pipe 4. A quick-release filter assembly is provided at the connection between the first return water pipe 8 and the second return water pipe 9.

[0025] Specifically: The quick-release filter assembly includes a filter mechanism disposed at the end of the first return water pipe 8 and a connecting mechanism disposed at the end of the second return water pipe 9; the filter mechanism includes a support ring 10 disposed on the outer end face of the first return water pipe 8, and a filter screen 11 is fixedly disposed inside the support ring 10. The connecting mechanism includes a connector 12 fixedly disposed at the end of the second return water pipe 9, the end of the connector 12 away from the second return water pipe 8 being connected to one end of a retractable corrugated pipe 13, a limiting head 14 fixedly disposed at the end of the corrugated pipe 13 away from the connector 12, a connecting sleeve 15 being movably sleeved on both the limiting head 14 and the corrugated pipe 13, and a through hole with an inner diameter larger than the outer diameter of the corrugated pipe 13 being opened on the upper top plate of the connecting sleeve 15, the outer diameters of both the connector 12 and the limiting head 13 being larger than the inner diameter of the through hole. The lower end of the connecting sleeve 15 is an open structure and its inner circumferential wall is provided with an internal thread. The outer circumferential wall of the end of the first return water pipe 8 is provided with an external thread that matches the internal thread of the connecting sleeve 15.

[0026] After the connecting sleeve 15 is fully threadedly connected to the first return water pipe 8, the lower surface of its top plate abuts against the upper surface of the limiting head 14, and the lower surface of the limiting head 14 abuts against the upper surface of the support ring 10, thereby fixing the filter screen. This effectively filters out scale and other particulate impurities in the return water, preventing damage to the water pump from particulate impurities flowing through. Furthermore, the connecting mechanism can be disassembled periodically by loosening the connecting sleeve. Once the connecting sleeve is completely detached from the first return water pipe, the entire connecting mechanism can be moved towards the second return water pipe, facilitating the replacement of the filter mechanism.

[0027] In addition, in this embodiment, sealing rings 16 are respectively provided between the support ring 10 and the first return water pipe 8 and the limiting head 14, so as to ensure the sealing effect of the connection part.

[0028] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. An antifreeze device for the flushing water pipeline of a desulfurization tower demister, characterized in that: The system includes an indoor process water tank with multiple water supply pipes, each equipped with a water pump. Each water supply pipe is connected to a flushing pipe used for flushing the desulfurization tower demister. A first check valve is installed at the connection between each water supply pipe and the corresponding flushing pipe. A return water pipe is connected between the water supply pipe and the flushing pipe at both ends of the first check valve. The inner diameter of the return water pipe is smaller than that of the water supply pipe.

2. The antifreeze device for the flushing water pipeline of the desulfurization tower demister according to claim 1, characterized in that: The specific model of the return water pipe is DN15.

3. The antifreeze device for the flushing water pipeline of the desulfurization tower demister according to claim 1, characterized in that: The return water pipe is equipped with a second check valve at the connection points with the water supply pipe and the flushing pipe, respectively.

4. The antifreeze device for the flushing water pipeline of the desulfurization tower demister according to claim 1, characterized in that: The return water pipe includes a first return water pipe connected to the water supply pipe and a second return water pipe connected to the flushing pipe, and a quick-release filter assembly is provided at the connection between the first return water pipe and the second return water pipe.

5. The antifreeze device for the flushing water pipeline of the desulfurization tower demister according to claim 4, characterized in that: The quick-release filter assembly includes a filter mechanism disposed at the end of the first return water pipe and a connecting mechanism disposed at the end of the second return water pipe. The filter mechanism includes a support ring disposed on the outer end face of the first return water pipe, and a filter screen is fixedly disposed inside the support ring. The connecting mechanism includes a connector fixedly disposed at the end of the second return water pipe. The end of the connector away from the second return water pipe is connected to one end of a retractable corrugated pipe. A limit head is fixedly disposed at the end of the corrugated pipe away from the connector. The limit head and the corrugated pipe share a common movable joint. The sleeve is equipped with a connecting sleeve. The upper top plate of the connecting sleeve has a through hole with an inner diameter larger than the outer diameter of the corrugated pipe. The outer diameters of the connecting head and the limiting head are both larger than the inner diameter of the through hole. The lower end of the connecting sleeve is an open structure and has an internal thread on its inner circumferential wall. The outer circumferential wall of the end of the first return water pipe has an external thread that matches the internal thread of the connecting sleeve. After the connecting sleeve is fully threadedly connected to the first return water pipe, the lower surface of its top plate abuts against the upper surface of the limiting head, and the lower surface of the limiting head abuts against the upper surface of the support ring.

6. The antifreeze device for the flushing water pipeline of the desulfurization tower demister according to claim 5, characterized in that: A sealing ring is provided between the support ring and the first return water pipe and the limiting head, respectively.

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