Device for treating acid-containing wastewater of pickling line

Abstract

The utility model discloses a device for treating acid-containing wastewater of a pickling line. The device comprises a storage device, a preconcentrator, an absorption tower, a deacidification tower and a washing tower, the water inlet end of the storage device is suitable for being connected with the water outlet end of a pickling unit, and the storage device is connected with the preconcentrator, the absorption tower, the deacidification tower and the washing tower through pipelines; the gas inlet end of the preconcentrator is suitable for flowing in high-temperature furnace gas, and the gas outlet end is communicated with the absorption tower through a pipeline; the gas outlet end of the absorption tower is connected with the gas inlet end of the deacidification tower through a pipeline; the gas outlet end of the deacidification tower is connected with the gas inlet end of the washing tower through a pipeline; the absorption tower, the deacidification tower and the washing tower are all provided with water outlet ends, the water outlet end of the washing tower is connected with the deacidification tower, and the water outlet end of the deacidification tower is connected with the absorption tower; through the arrangement, high-concentration acid-containing wastewater is changed into low-concentration acid-containing wastewater through reutilization, so that a large amount of alkali is saved, and the water treatment cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of acid wastewater treatment technology, and in particular to a device for treating acid wastewater from pickling units. Background Technology

[0002] The working principle of the pickling unit mainly involves the chemical reaction and physical impact between the pickling solution and the iron oxide scale on the surface of the strip steel, causing the iron oxide scale to fall off the surface of the strip steel, thereby achieving the purpose of cleaning the surface of the strip steel. In this process, the pickling unit will generate a large amount of acidic wastewater, which cannot be used and must be discharged into the water treatment plant for alkali neutralization. The discharge of a large amount of acidic wastewater into the water treatment plant for alkali neutralization wastes hydrochloric acid resources, consumes a large amount of caustic soda flakes, and has high water treatment operating costs. Utility Model Content

[0003] In view of this, this application provides a device for treating acidic wastewater from pickling units, which applies the acidic wastewater generated by the pickling unit to the acid regeneration unit, thereby reducing the concentration of the acidic wastewater, saving a large amount of alkali, and reducing water treatment costs.

[0004] According to one aspect of this application, a device for treating acidic wastewater from an acid pickling unit is provided, comprising a storage tank, a pre-concentrator, an absorption tower, an acid removal tower, and a washing tower; the inlet of the storage tank is adapted to connect to the outlet of the acid pickling unit, and high-concentration acidic wastewater flows into the storage tank; the storage tank is connected by pipelines to the pre-concentrator, the absorption tower, the acid removal tower, and the washing tower for treating the high-concentration acidic wastewater; the inlet of the pre-concentrator is adapted to receive high-temperature furnace gas, and the outlet is connected to the absorption tower via a pipeline; the outlet of the absorption tower is connected by a pipeline to the inlet of the acid removal tower, and the outlet of the acid removal tower is connected by a pipeline to the inlet of the washing tower; the absorption tower, the acid removal tower, and the washing tower are all provided with outlets, the outlet of the washing tower is connected to the acid removal tower, the outlet of the acid removal tower is connected to the absorption tower, and the outlet of the absorption tower is connected to an external regeneration acid tank.

[0005] In one possible implementation, the inlet of the storage tank is equipped with a concentration detector for detecting the acid concentration of the acidic wastewater.

[0006] In one possible implementation, a switching valve is disposed below the concentration detector, and the switching valve is electrically connected to the concentration detector.

[0007] In one possible implementation, the outlet of the reservoir is connected to a pipeline, which consists of a main pipeline and four branch pipelines, namely a first branch pipeline, a second branch pipeline, a third branch pipeline, and a fourth branch pipeline; the main pipeline and the branch pipelines are connected in a manner, and the inlet of the main pipeline is connected to the outlet of the reservoir.

[0008] In one possible implementation, the inlet of the pre-concentrator is located on the opposite side of the pre-concentrator and the absorption tower, and is connected to the outlet of the first branch pipeline.

[0009] In one possible implementation, the inlet of the absorption tower is located at the top of the absorption tower, and a spray head is provided at the top inside the absorption tower. The outlet of the second branch pipe is connected to the inlet of the absorption tower. The inlet of the acid removal tower is located at the top of the acid removal tower, and the spray head is also located at the top inside the acid removal tower. The outlet of the third branch pipe is connected to the inlet of the acid removal tower via a pipeline.

[0010] In one possible implementation, a condenser is further included, which is disposed between the acid removal tower and the washing tower; a fan is disposed between the condenser and the washing tower, the inlet of the fan being connected to the outlet of the condenser, and the outlet of the fan being connected to the inlet of the washing tower.

[0011] In one possible implementation, the water inlet of the scrubbing tower is located on the opposite side of the scrubbing tower and the fan, and the water inlet of the scrubbing tower is connected to the fourth branch pipeline.

[0012] In one possible implementation, a roasting furnace and a purification tower are also included, with the outlet of the roasting furnace connected to the inlet of the pre-concentrator and the inlet of the purification tower connected to the outlet of the scrubbing tower.

[0013] In one possible implementation, a drain pipe is provided at the bottom of the absorption tower, the drain pipe is connected to an external regenerated acid tank, and the switch valve is also provided on the drain pipe.

[0014] The beneficial effects of this utility model are as follows: By setting up a storage device, the high-concentration acidic wastewater generated by the pickling unit during operation is stored. The storage device transmits the high-concentration acidic wastewater through pipelines to the pre-concentrator, absorption tower, deacidification tower, and washing tower respectively. The high-concentration acidic wastewater is used as a spray liquid in the absorption tower and deacidification tower, and is mixed with the furnace gas in the pre-concentrator and washing tower. In this way, the high-concentration acidic wastewater can be reused to become low-concentration acidic wastewater, saving a lot of alkali and reducing water treatment costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall device for treating acidic wastewater from a pickling unit according to an embodiment of this application. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model or simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," "linking," and "hinged" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] like Figure 1As shown, the device for treating acidic wastewater from a pickling unit includes a storage tank 100, a pre-concentrator 200, an absorption tower 300, an acid removal tower 400, and a washing tower 600. The inlet of the storage tank 100 is connected to the outlet of the pickling unit, allowing high-concentration acidic wastewater to flow into it. The outlet of the storage tank 100 is connected to the inlet of the pre-concentrator 200. Pipelines connect the storage tank 100 to the pre-concentrator 200, the absorption tower 300, the acid removal tower 400, and the washing tower 600 to remove the high-concentration acidic wastewater. The acid wastewater is treated; the inlet of the pre-concentrator 200 is suitable for the inflow of high-temperature furnace gas, and the outlet is connected to the absorption tower 300 through a pipeline; the outlet of the absorption tower 300 is connected to the inlet of the acid removal tower 400 through a pipeline for absorbing the high-temperature furnace gas; the absorption tower 300, the acid removal tower 400 and the scrubbing tower 600 are all equipped with water outlets, the water outlet of the scrubbing tower 600 is connected to the acid removal tower 400, the water outlet of the acid removal tower 400 is connected to the absorption tower 300, and the water outlet of the absorption tower 300 is connected to an external regeneration acid tank.

[0022] Specifically, the storage tank 100, pre-concentrator 200, absorption tower 300, acid removal tower 400, and washing tower 600 are connected in sequence, allowing high-temperature furnace gas to pass through sequentially. The inlet of the storage tank 100 is suitable for connecting to the end of the pickling unit. When the pickling unit is working, it generates a large amount of acid-containing wastewater. The high-concentration acid-containing wastewater flows into the storage tank 100. The storage tank 100 is connected to the pre-concentrator 200, absorption tower 300, acid removal tower 400, and washing tower 600 via pipelines. The storage tank 100 dilutes the high-concentration acid-containing wastewater into... The wastewater is transported to the pre-concentrator 200, absorption tower 300, acid removal tower 400, and scrubbing tower 600 for treatment of high-concentration acidic wastewater, which eventually enters the external regeneration acid tank. The inlet of the pre-concentrator 200 is suitable for the inflow of high-temperature furnace gas, and the outlet is connected to the absorption tower 300 through a pipeline. The outlet of the absorption tower 300 is connected to the inlet of the acid removal tower 400 through a pipeline for the absorption of high-temperature furnace gas. Through the above pipeline connection, the high-temperature furnace gas is absorbed, purified, and cooled to meet national emission standards.

[0023] In one possible implementation, a concentration detector is provided at the inlet of the storage unit 100 to detect the acid concentration of the acidic wastewater.

[0024] Specifically, such as Figure 1 As shown, in order to detect the concentration of acidic wastewater generated by the pickling unit, a concentration detector is installed at the inlet of the storage unit 100, which can detect the concentration of acidic wastewater.

[0025] In one possible implementation, a switching valve is located below the concentration detector, and the switching valve is electrically connected to the concentration detector.

[0026] Specifically, to prevent low-concentration acidic wastewater from entering the storage tank 100, a switch valve is installed below the concentration detector. When the concentration detector detects that the concentration of acidic wastewater is lower than the set value, a shut-off signal is sent to the switch valve, and the switch valve closes, preventing low-concentration acidic wastewater from entering the storage tank 100. The low-concentration acidic wastewater is discharged through the acid washing group. When the concentration detector detects that the concentration of acidic wastewater is higher than the set value, the switch valve opens, and high-concentration acidic wastewater enters the storage tank 100.

[0027] In one possible implementation, the outlet of the storage 100 is connected to a pipeline, which consists of a main pipeline and four branch pipelines, namely a first branch pipeline, a second branch pipeline, a third branch pipeline, and a fourth branch pipeline; the main pipeline is connected to the branch pipelines, and the inlet of the main pipeline is connected to the outlet of the storage 100.

[0028] Specifically, such as Figure 1 As shown, in order to transport high-concentration acidic wastewater to the pre-concentrator 200, absorption tower 300, deacidification tower 400, and scrubbing tower 600, a pipeline is connected to the outlet of the storage tank 100. The pipeline consists of a main pipeline and four branch pipelines, namely the first branch pipeline, the second branch pipeline, the third branch pipeline, and the fourth branch pipeline. The main pipeline is connected to the branch pipelines, and the inlet of the main pipeline is connected to the outlet of the storage tank 100. Through these four branch pipelines, the high-concentration acidic wastewater is transported to the pre-concentrator 200, absorption tower 300, deacidification tower 400, and scrubbing tower 600.

[0029] In one possible implementation, the inlet of the pre-concentrator 200 is located on the opposite side of the pre-concentrator 200 and the absorption tower 300, and is connected to the outlet of the first branch pipeline.

[0030] Specifically, such as Figure 1 As shown, the water inlet of the pre-concentrator 200 is located on one side of the pre-concentrator 200 at a lower position, at the same height as the gas outlet of the pre-concentrator 200. This arrangement allows the furnace gas to come into full contact with the high-concentration acidic wastewater.

[0031] In one possible implementation, the inlet of the absorption tower 300 is located at the top of the absorption tower 300, and a spray head is installed at the top inside the absorption tower 300. The outlet of the second branch pipe is connected to the inlet of the absorption tower 300. The inlet of the acid removal tower 400 is located at the top of the acid removal tower 400, and a spray head is also installed at the top inside the acid removal tower 400. The outlet of the third branch pipe is connected to the inlet of the acid removal tower 400.

[0032] In one possible implementation, a condenser 600 is also included, which is disposed between the acid removal tower 400 and the scrubbing tower 600. A fan 800 is disposed between the condenser 500 and the scrubbing tower 600, with the inlet end of the fan 800 connected to the outlet end of the condenser 500 and the outlet end of the fan 800 connected to the inlet end of the scrubbing tower 600.

[0033] Specifically, such as Figure 1 As shown, the outlet of the acid removal tower 400 is connected to the inlet of the condenser 500 by a pipeline for cooling the high-temperature furnace gas. The high-temperature furnace gas is drawn from the condenser 500 into the scrubbing tower 600 by the fan 800.

[0034] In one possible implementation, the water inlet of the scrubbing tower 600 is located on the opposite side of the scrubbing tower 600 and the blower 800, and the water inlet of the scrubbing tower 600 is connected to the fourth branch pipeline.

[0035] Specifically, such as Figure 1 As shown, the water inlet of the scrubbing tower 600 is located on the opposite side of the scrubbing tower 600 and the blower 800, and the height of the water inlet of the scrubbing tower 600 is the same as the height of the air inlet of the scrubbing tower 600, which can enable the furnace gas to fully contact the high-concentration acidic wastewater.

[0036] In one possible implementation, a roasting furnace and a purification tower are also included, with the outlet of the roasting furnace connected to the inlet of the pre-concentrator 200 and the inlet of the purification tower 700 connected to the outlet of the scrubbing tower 600.

[0037] In one possible implementation, a drain pipe is installed at the bottom of the absorption tower 300, which is connected to an external regenerated acid tank, and a switch valve is also installed on the drain pipe; such a configuration can control the discharge of acidic wastewater.

[0038] This application sets up a storage tank 100, a pre-concentrator 200, an absorption tower 300, an acid removal tower 400, a condenser 500, a washing tower 600, and a purification tower 700, which are connected in sequence. A concentration detector is installed at the inlet of the storage tank 100 to detect the acid concentration of the acidic wastewater. A switch valve is installed below the concentration detector to prevent low-concentration acidic wastewater from entering the storage tank 100. Through the above settings, this application enables high-concentration acidic wastewater to be reused and transformed into low-concentration acidic wastewater, saving a significant amount of alkali and reducing water treatment costs.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for treating acidic wastewater from pickling units, characterized in that, Includes storage tanks, pre-concentrators, absorption towers, acid removal towers, and washing towers; The inlet of the storage unit is suitable for connecting to the outlet of the pickling unit. High-concentration acidic wastewater flows into the storage unit. The storage unit is connected to the pre-concentrator, the absorption tower, the acid removal tower and the washing tower by pipelines for treating the high-concentration acidic wastewater. The inlet of the pre-concentrator is suitable for high-temperature furnace gas to flow in, and the outlet is connected to the absorption tower through a pipeline. The outlet of the absorption tower is connected to the inlet of the acid removal tower by a pipeline, and the outlet of the acid removal tower is connected to the inlet of the washing tower by a pipeline. The absorption tower, the acid removal tower, and the washing tower are all equipped with water outlets. The water outlet of the washing tower is connected to the acid removal tower, the water outlet of the acid removal tower is connected to the absorption tower, and the water outlet of the absorption tower is connected to an external regeneration acid tank.

2. The device for treating acidic wastewater from pickling units according to claim 1, characterized in that, The inlet of the storage tank is equipped with a concentration detector to detect the acid concentration of the acidic wastewater.

3. The device for treating acidic wastewater from pickling units according to claim 2, characterized in that, A switching valve is provided below the concentration detector, and the switching valve is electrically connected to the concentration detector.

4. The device for treating acidic wastewater from pickling units according to claim 3, characterized in that, The water outlet of the storage device is connected to a pipeline, which consists of a main pipeline and four branch pipelines, namely the first branch pipeline, the second branch pipeline, the third branch pipeline and the fourth branch pipeline; The main pipeline is connected to the branch pipeline, and the inlet of the main pipeline is connected to the outlet of the storage tank.

5. The device for treating acidic wastewater from pickling units according to claim 4, characterized in that, The inlet of the pre-concentrator is located on the opposite side of the pre-concentrator and the absorption tower, and is connected to the outlet of the first branch pipeline.

6. The device for treating acidic wastewater from pickling units according to claim 5, characterized in that, The water inlet of the absorption tower is located at the top of the absorption tower, and a spray head is installed at the top inside the absorption tower. The water outlet of the second branch pipe is connected to the water inlet of the absorption tower. The water inlet of the acid removal tower is located at the top of the acid removal tower, and the spray head is also located at the top inside the acid removal tower. The water outlet of the third branch pipe is connected to the water inlet of the acid removal tower.

7. The device for treating acidic wastewater from pickling units according to claim 6, characterized in that, It also includes a condenser, which is disposed between the acid removal tower and the washing tower; A fan is provided between the condenser and the scrubbing tower. The air inlet of the fan is connected to the air outlet of the condenser, and the air outlet of the fan is connected to the air inlet of the scrubbing tower.

8. The device for treating acidic wastewater from pickling units according to claim 7, characterized in that, The water inlet of the washing tower is located on the opposite side of the washing tower and the fan, and the water inlet of the washing tower is connected to the fourth branch pipeline.

9. The device for treating acidic wastewater from pickling units according to claim 8, characterized in that, It also includes a roasting furnace and a purification tower, wherein the gas outlet of the roasting furnace is connected to the gas inlet of the pre-concentrator, and the gas inlet of the purification tower is connected to the gas outlet of the washing tower.

10. The device for treating acidic wastewater from pickling units according to claim 3, characterized in that, The bottom of the absorption tower is equipped with a drain pipe, which is connected to an external regeneration acid tank. The switch valve is also installed on the drain pipe.

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