Automatic acid mist tower cleaning system based on differential pressure detection

Abstract

The utility model discloses an acid mist tower automatic cleaning system based on differential pressure detection, and belongs to the technical field of acid mist-containing waste gas treatment. The acid mist purification tower comprises a circulating liquid spraying device, two filler layers, a wire mesh demister and a water washing spraying device, the two filler layers are vertically distributed in the middle of the acid mist purification tower respectively, and the circulating liquid spraying device is introduced to the position above each filler layer in the acid mist purification tower from the outside of the acid mist purification tower and sprays circulating liquid downwards. The wire mesh demister is arranged at the upper part in the acid mist purification tower, and the water washing spraying device is introduced from the outside of the acid mist purification tower to the lower part of the wire mesh demister in the acid mist purification tower and sprays water upwards. According to the utility model, automatic cleaning of the demister can be realized, and the acid mist treatment efficiency and the system stability are improved.

Description

Technical Field

[0001] This utility model belongs to the field of acid mist exhaust gas treatment technology, specifically relating to an automatic cleaning system for acid mist towers based on differential pressure detection. Background Technology

[0002] In the copper smelting industry, acid mist towers are used to treat acid-containing waste gas generated from various tanks in electrolysis workshops, solving the problems of environmental pollution and equipment corrosion caused by acidic waste gas. Existing technologies have improved gas treatment efficiency through automation, but filter clogging requires manual intervention during system operation and cannot be cleaned in a timely manner, resulting in poor treatment effects for acidic waste gas. Utility Model Content

[0003] This invention addresses the aforementioned problems and overcomes the shortcomings of existing technologies by providing an automatic cleaning system for acid mist towers based on differential pressure detection. This invention enables automatic cleaning of the demister, improving acid mist treatment efficiency and system stability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] This utility model provides an automatic cleaning system for acid mist towers based on differential pressure detection. It is characterized by comprising a circulating liquid spraying device, a packing layer, a wire mesh demister, and a water rinsing spraying device. The packing layer consists of two layers, one above the other, arranged vertically within the middle of the acid mist purification tower. The circulating liquid spraying device introduces the liquid from outside the acid mist purification tower to the top of each packing layer within the tower and sprays the circulating liquid downwards. The wire mesh demister is located in the upper part of the acid mist purification tower. The water rinsing spraying device introduces the liquid from outside the tower to the area below the wire mesh demister within the tower and sprays water upwards.

[0006] Furthermore, the circulating liquid spraying device includes a main circulating pump and two spray pipes. The two spray pipes are located above the two packing layers and connected inside the acid mist purification tower. The two spray pipes are connected to one end of the main circulating pump outside the acid mist purification tower through an external pipeline. The other end of the main circulating pump is connected to the circulating liquid recovery port at the bottom of the acid mist purification tower through a pipeline.

[0007] Furthermore, a backup circulation pump is connected in parallel with the main circulation pump, and the two ends of the backup circulation pump are connected to the two spray pipes and the circulating liquid recovery port through pipelines.

[0008] Furthermore, the packing layer is filled with polypropylene Pall ring packing.

[0009] Furthermore, a differential pressure transmitter is also connected to the acid mist purification tower. The two ends of the differential pressure transmitter are connected to the top and bottom of the wire mesh demister, respectively. A flushing pneumatic switch valve is installed on the water flushing spray device. Both the differential pressure transmitter and the flushing pneumatic switch valve are electrically connected to a PLC. The PLC receives the differential pressure signal from the differential pressure transmitter and controls the flushing pneumatic switch valve to open and close.

[0010] Furthermore, the wire mesh demister is made of polypropylene.

[0011] Furthermore, the sidewall of the acid mist purification tower is provided with sight glass observation holes above both of the packing layers and the wire mesh demister.

[0012] Furthermore, the acid mist purification tower is equipped with fiberglass support beams, which are wrapped with an FRP layer. The fiberglass support beams are used to support the packing layer and the wire mesh demister.

[0013] The beneficial effects of this utility model.

[0014] This invention optimizes the contact efficiency between waste gas and absorbent liquid by setting up a double-layer packing layer and a circulating liquid spraying device, thereby improving acid mist treatment efficiency and system stability. In addition, the differential pressure transmitter can monitor the pressure difference between the upper and lower ends of the wire mesh demister in real time, and combined with the PLC program, automatic cleaning control can be realized, reducing the frequency of manual intervention, lowering labor costs, and extending the service life of the equipment. Attached Figure Description

[0015] To make the technical problems solved, the technical solutions, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] Figure 1 This is a structural schematic diagram of the present invention in its initial state.

[0017] The markings in the diagram are as follows: 1 is the packing layer, 2 is the wire mesh demister, 3 is the water flushing spray device, 4 is the acid mist purification tower, 5 is the main circulating pump, 6 is the spray pipe, 7 is the circulating liquid recovery port, 8 is the standby circulating pump, 9 is the differential pressure transmitter, 10 is the pneumatic switch valve, and 11 is the sight glass observation hole. Detailed Implementation

[0018] As shown in the accompanying drawings, this embodiment provides an automatic cleaning system for acid mist towers based on differential pressure detection, including a circulating liquid spraying device, a packing layer 1, a wire mesh demister 2, and a water rinsing spraying device 3.

[0019] The packing layer 1 consists of two layers, one above the other, located in the middle of the acid mist purification tower 4. Each packing layer 1 is filled with polypropylene Pall ring packing to increase the contact area between the waste gas and the absorption liquid, thereby improving the treatment efficiency.

[0020] The circulating liquid spraying device includes a main circulating pump 5 and two spray pipes 6. The two spray pipes 6 are introduced from outside the acid mist purification tower 4 and connected to the two packing layers 1 inside the acid mist purification tower 4. Both spray pipes 6 are simultaneously connected to one end of the main circulating pump 5 outside the acid mist purification tower 4 via external pipelines. The other end of the main circulating pump 5 is connected to the circulating liquid recovery port 7 at the bottom of the acid mist purification tower 4 via a pipeline. The main circulating pump 5 circulates the circulating liquid, causing the spray pipes 6 to spray downwards onto the two packing layers 1.

[0021] To prevent damage to or maintenance of the main circulation pump 5 from affecting system operation, a backup circulation pump 8 is connected in parallel with the main circulation pump 5. The two ends of the backup circulation pump 8 are connected to two spray pipes 6 and the circulating liquid recovery port 7 through pipelines. When the main circulation pump 5 fails or is under maintenance, the backup circulation pump 8 is turned on.

[0022] The acid mist purification tower 4 has sight glass observation holes 11 on both sides above the two packing layers 1, which facilitates observation, maintenance and cleaning, and prevents acid mist crystallization from affecting the stable operation of the packing layer 1.

[0023] Because the exhaust gas contains highly corrosive substances (such as sulfuric acid mist), a polypropylene wire mesh demister 2 is installed in the upper part of the acid mist purification tower 4. A water flushing spray device 3 is introduced from outside the acid mist purification tower 4 to the bottom of the wire mesh demister 2 inside the acid mist purification tower 4, and water is sprayed upward to clean the wire mesh demister 2.

[0024] A differential pressure transmitter 9 is also connected to the acid mist purification tower 4. The two ends of the differential pressure transmitter 9 are connected to the top and bottom of the wire mesh demister 2, respectively, to detect the pressure difference between the upper and lower end faces of the wire mesh demister 2. The wire mesh clogging status of the wire mesh demister 2 can be judged by the pressure difference change.

[0025] The water rinsing spray device 3 is equipped with a rinsing pneumatic switch valve 10. The differential pressure transmitter 9 and the rinsing pneumatic switch valve 10 are both electrically connected to the PLC. The PLC receives the differential pressure signal from the differential pressure transmitter 9 and controls the rinsing pneumatic switch valve 10 to open and close.

[0026] When the differential pressure transmitter 9 detects ΔP ≥ 150Pa and continues for 120 seconds, it opens the pneumatic switch valve 10 to perform cleaning. The cleaning stops automatically when ΔP ≤ 50Pa, thus realizing the automatic spray cleaning of the wire mesh demister 2.

[0027] The side wall of the acid mist purification tower 4 is also equipped with a sight glass observation hole 11 above the wire mesh demister 2, which facilitates observation, disassembly, cleaning, maintenance and replacement.

[0028] To enhance support strength and corrosion resistance, the acid mist purification tower 4 is equipped with fiberglass support beams (not shown in the figure) to support the packing layer 1 and the wire mesh demister 2. The fiberglass support beams are wrapped with an FRP layer.

[0029] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. An automatic cleaning system for an acid mist tower based on differential pressure detection, characterized in that, The system includes a circulating liquid spraying device, a packing layer (1), a wire mesh demister (2), and a water flushing spraying device (3). The packing layer (1) consists of two layers, which are respectively distributed vertically and vertically in the middle of the acid mist purification tower (4). The circulating liquid spraying device is introduced from outside the acid mist purification tower (4) to the top of each packing layer (1) inside the acid mist purification tower (4) and sprays the circulating liquid downwards. The wire mesh demister (2) is located in the upper part of the acid mist purification tower (4). The water flushing spraying device (3) is introduced from outside the acid mist purification tower (4) to the bottom of the wire mesh demister (2) inside the acid mist purification tower (4) and sprays water upwards.

2. The automatic cleaning system of an acid mist tower based on differential pressure detection according to claim 1, characterized in that, The circulating liquid spraying device includes a main circulating pump (5) and two spray pipes (6). The two spray pipes (6) are located above the two layers of packing (1) and connected inside the acid mist purification tower (4). The two spray pipes (6) are connected to one end of the main circulating pump (5) outside the acid mist purification tower (4) through external pipelines. The other end of the main circulating pump (5) is connected to the circulating liquid recovery port (7) at the bottom of the acid mist purification tower (4) through a pipeline.

3. The automatic cleaning system of an acid mist tower based on differential pressure detection according to claim 2, characterized in that, The main circulation pump (5) is connected in parallel with a standby circulation pump (8), and the two ends of the standby circulation pump (8) are connected to the two spray pipes (6) and the circulating liquid recovery port (7) through pipelines.

4. The automatic cleaning system of acid mist tower based on differential pressure detection according to claim 1, characterized in that, The packing layer (1) is filled with polypropylene Pall ring packing.

5. The automatic cleaning system of acid mist tower based on differential pressure detection according to claim 1, characterized in that, A differential pressure transmitter (9) is also connected to the acid mist purification tower (4). The two ends of the differential pressure transmitter (9) are connected to the top and bottom of the wire mesh demister (2) respectively. A flushing pneumatic switch valve (10) is provided on the water flushing spray device (3). Both the differential pressure transmitter (9) and the flushing pneumatic switch valve (10) are electrically connected to the PLC. The PLC receives the differential pressure signal from the differential pressure transmitter (9) and controls the flushing pneumatic switch valve (10) to open and close.

6. The automatic cleaning system of acid mist tower based on differential pressure detection according to claim 1, characterized in that, The wire mesh demister (2) is made of polypropylene.

7. The automatic cleaning system for acid mist towers based on differential pressure detection according to claim 1, characterized in that, The acid mist purification tower (4) has sight glass observation holes (11) above the two layers of packing layer (1) and the wire mesh demister (2) on its side wall.

8. The automatic cleaning system of acid mist tower based on differential pressure detection according to claim 1, characterized in that, The acid mist purification tower (4) is equipped with a fiberglass support beam, which is wrapped with an FRP layer. The fiberglass support beam is used to support the packing layer (1) and the wire mesh demister (2).

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