Automatic collecting device for cold rolling acid-containing wastewater

Abstract

The utility model discloses an automatic collecting device for cold rolling acid-containing wastewater, the device is provided with a rinsing water tank and an acid mist washing tower, the bottom of the acid mist washing tower is connected with the rinsing water tank through a pipeline of a drainage pump, the acid mist washing tower is used for conveying acid liquor in the acid mist washing tower to the rinsing water tank, and the drainage pump is an acid-resistant pump. The utility model solves the problem of recycling the acid-containing wastewater in the acid mist purification room, reduces the loss of acid, and not only can reduce the production cost, but also can relieve the environmental protection pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of pickling of pickling lines, in particular to an automatic collection device for cold rolling acid-containing wastewater. Background Art

[0002] Currently, an acid mist purification system is installed in the pickling process section of the pickling line in the technical room. After the acid mist is washed with desalted water, the exhaust gas meets the emission standards. The acid-containing wastewater in the scrubber is discharged to the water treatment plant for disposal.

[0003] For example, the public document with publication number CN217662509U, publication date 2022-10-28, and patent name "A acid mist purification system for a pickling line" discloses an acid mist purification system for a pickling line, including a washing tower, a fan, a droplet pre-separator and a circulating washing system. The interior of the washing tower is provided with a top demister, a washing spray nozzle, a packing layer and a water reservoir from top to bottom. The air inlet of the fan is connected to the air vent at the top of the washing tower, and the air outlet is connected to the acid mist chimney; the air inlet of the droplet pre-separator is connected to the acid mist pipe of the pickling section of the pickling line, and the exhaust port is connected to the cavity between the packing layer and the water reservoir through a pipe; the circulating washing system is connected between the water reservoir and the washing spray nozzle.

[0004] The current purification equipment used results in waste of acid and increases water treatment costs. Acid regeneration requires the use of acid-containing wastewater to absorb the acid during the production process. If the high-quality acid-containing wastewater produced by the acid mist purification system is recycled and used in the acid regeneration process, both water treatment costs and acid consumption can be reduced. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to realize a device with the function of recovering high-quality acid-containing wastewater produced in an acid mist purification room.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an automatic collection device for cold-rolled acid-containing wastewater, the device is provided with a rinsing water tank and an acid mist washing tower, the bottom of the acid mist washing tower is connected to the rinsing water tank through a pipe of a drainage pump, which is used to transport the acid liquid in the acid mist washing tower to the rinsing water tank, and the drainage pump is an acid-resistant pump.

[0007] The liquid inlet of the rinsing water tank connected to the pipeline is at the top of the rinsing water tank.

[0008] The bottom liquid outlet of the acid mist washing tower is connected to the liquid inlet at the top through a circulating washing pipeline provided with a circulating pump. The circulating washing pipeline is provided with a conductivity meter, and the circulating pump is an acid-resistant pump.

[0009] The conductivity meter is connected to and outputs the measured conductivity value of the acid solution in the circulating washing pipeline to the PLC.

[0010] A liquid level meter is provided in the acid mist washing tower, and the liquid level meter is connected to and outputs the acid liquid level signal in the acid mist washing tower to the PLC. A water supply pipe is provided on the acid mist washing tower, and a water supply valve is provided on the water supply pipe. The PLC is connected to and outputs a control signal to the water supply valve.

[0011] The water supply pipeline is connected to the municipal tap water pipeline.

[0012] The PLC is connected to and outputs control signals to the drainage pump and the circulation pump.

[0013] The utility model solves the problem of recycling acid-containing wastewater in the acid mist purification room, and also reduces the loss of acid, thereby reducing the production cost and alleviating the pressure on environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following is a brief description of the contents and marks in each figure in the utility model specification:

[0015] Figure 1 This is a schematic diagram of the structure of the automatic collection device for cold rolling acid-containing wastewater;

[0016] The marks in the above figure are: 1. Rinse water tank; 2. Acid mist washing tower; 3. Drain pump; 4. Water supply valve; 5. Circulation pump; 6. Conductivity meter; 7. Liquid level meter. DETAILED DESCRIPTION

[0017] Below, with reference to the accompanying drawings, through the description of the embodiments, the specific implementation methods of the present invention, such as the shape, structure, relative positions and connection relationships of the various components involved, the functions and working principles of the various parts, the manufacturing process and operating methods, etc., are further explained in detail to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0018] The automatic collection device for cold-rolled acid-containing wastewater is an improvement on the existing rinsing water tank 1 and acid mist washing tower 2. In order to recycle the high-quality acid-containing wastewater generated in the acid mist purification room, an acid-resistant pump is first installed at the bottom of the acid mist washing tower 2. The bottom of the acid mist washing tower 2 is connected to the rinsing water tank 1 through a pipe of the drainage pump 3. The liquid inlet of the rinsing water tank 1 connected to the pipe is at the top of the rinsing water tank 1. The pipe is used to transport the acid liquid in the acid mist washing tower 2 to the rinsing water tank 1. Because the acid liquid is transported, the drainage pump 3 needs to be an acid-resistant pump.

[0019] Because the rinse water tank 1 adds an acid liquid recovery pipeline, it is necessary to monitor the processing steps of the acid mist washing tower 2. Preferably, the bottom liquid outlet of the acid mist washing tower 2 is connected to the liquid inlet at the top through a circulating washing pipeline provided with a circulating pump 5. A conductivity meter 6 is provided on the circulating washing pipeline to form a circulation detection system. The conductivity meter 6 is connected to and outputs the measured acid liquid conductivity value in the circulating washing pipeline to the PLC. The PLC is the main controller. The PLC is connected to and outputs control signals to the drain pump 3 and the circulating pump 5.

[0020] The conductivity meter 6 feeds back its detection data to the PLC, which can control the system according to preset parameters. The parameter selection here needs to be comprehensively considered based on the operating environment. For example, the PLC program can be set to automatically start the drainage pump 3 when the conductivity is ≥50ms / cm, discharging the acid-containing wastewater into the acid regeneration rinse water tank 1. Because acid also flows in the circulating washing pipeline, the circulating pump 5 is also an acid-resistant pump.

[0021] A liquid level gauge 7 is installed in the acid mist scrubber 2. The liquid level gauge 7 is connected to and outputs the acid liquid level signal in the acid mist scrubber 2 to the PLC. A water supply pipe is provided on the acid mist scrubber 2, and a water supply valve 4 is provided on the water supply pipe. The PLC connects and outputs a control signal to the water supply valve 4. The water supply pipe is connected to the municipal tap water pipe and is used to replenish tap water in the acid mist scrubber 2. The liquid level control also adopts a conventional threshold control method, that is, the liquid level gauge 7 and the automatic water supply valve 4 are installed in the acid mist scrubber 2. When the liquid level is lower than 500mm, the automatic water supply valve 4 opens to replenish water. When the liquid level rises to 650mm, the water supply stops. By ensuring the liquid level in the acid mist scrubber 2, the entire system can complete the recycling and reuse of the acid without affecting the operation of existing equipment, and can also ensure the quality of the recycled acid.

[0022] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. An automatic collection device for cold rolling acid wastewater, comprising a rinse water tank and an acid mist scrubber, characterized in that: The bottom of the acid mist washing tower is connected to the rinsing water tank through a pipe of a drainage pump, which is used to transport the acid liquid in the acid mist washing tower to the rinsing water tank. The drainage pump is an acid-resistant pump.

2. The automatic collection device for cold rolling acid wastewater according to claim 1, characterized in that: The liquid inlet of the rinsing water tank connected to the pipeline is at the top of the rinsing water tank.

3. The automatic collection device for cold rolling acid wastewater according to claim 1 or 2, characterized in that: The bottom liquid outlet of the acid mist washing tower is connected to the liquid inlet at the top through a circulating washing pipeline provided with a circulating pump. The circulating washing pipeline is provided with a conductivity meter, and the circulating pump is an acid-resistant pump.

4. The automatic collection device for cold rolling acid wastewater according to claim 3, characterized in that: The conductivity meter is connected to and outputs the measured conductivity value of the acid solution in the circulating washing pipeline to the PLC.

5. The automatic collection device for cold rolling acid wastewater according to claim 4 is characterized in that: A liquid level meter is provided in the acid mist washing tower, and the liquid level meter is connected to and outputs the acid liquid level signal in the acid mist washing tower to the PLC. A water supply pipe is provided on the acid mist washing tower, and a water supply valve is provided on the water supply pipe. The PLC is connected to and outputs a control signal to the water supply valve.

6. The automatic collection device for cold rolling acid wastewater according to claim 5, characterized in that: The water supply pipeline is connected to the municipal tap water pipeline.

7. The automatic collection device for cold rolling acid wastewater according to claim 6, characterized in that: The PLC is connected to and outputs control signals to the drainage pump and the circulation pump.

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