Tail gas emission reduction device of acid regeneration group

Abstract

The utility model discloses a tail gas emission reduction device of an acid regeneration group. The tail gas emission reduction device comprises a roasting furnace, a separator, a Venturi preconcentrator, a heat exchanger, an absorption tower, a secondary absorption tower, a fan and a washing tower, the roasting furnace, the separator, the Venturi preconcentrator and the absorption tower are sequentially arranged and are connected through a pipeline; a water inlet pipe is arranged on the washing tower; the secondary absorption tower is arranged between the absorption tower and the washing tower, and the water inlet pipe is also arranged on the secondary absorption tower; a first heat exchanger is arranged between the secondary absorption tower and the washing tower, a second heat exchanger is arranged at the bottom of the side, opposite to the absorption tower, of the secondary absorption tower, and a third heat exchanger is arranged on one side of the washing tower; the fan is arranged between the first heat exchanger and the washing tower; through the arrangement, flue gas is absorbed for multiple times, harmful substances in the flue gas are absorbed, and even if the device is used for a long time, the flue gas can reach the national emission standard.

Description

Technical Field

[0001] The utility model relates to the technical field of acid regeneration, in particular to an exhaust gas emission reduction device for an acid regeneration unit. Background Art

[0002] When hot-rolled steel plates are pickled with hydrochloric acid, iron and iron oxide scale on the steel plate surface react with hydrochloric acid and turn into chlorides mainly composed of ferrous chloride, which are dissolved in the hydrochloric acid solution. As the pickling process progresses, the concentration of iron ions in the pickling acid solution will increase, while the concentration of free hydrogen chloride will decrease accordingly. In order to maintain the concentration of free hydrogen chloride in the pickling acid and remove the increased iron ions in the acid solution, the waste acid solution is sent to an acid regeneration device. The acid-containing gas generated by roasting the waste acid forms regenerated acid after passing through an absorption tower and then returns to the pickling unit to reuse the waste acid. During this process, the residual waste gas is discharged into the atmosphere after passing through a scrubber.

[0003] For the current acid regeneration production line, the waste gas purified by absorption in the scrubber, due to the spray water in the scrubber, with the passage of time, the concentration of waste acid and temperature are increasing. After long-term use, it is very difficult to fully absorb harmful substances and it is very difficult to meet the national emission standards. Summary of the Utility Model

[0004] In view of this, the present application provides an exhaust gas emission reduction device for an acid regeneration unit, which can further absorb harmful substances.

[0005] According to one aspect of the present application, there is provided an exhaust gas emission reduction device for an acid regeneration unit, including a roasting furnace, a separator, a Venturi pre-concentrator, a heat exchanger, an absorption tower, a secondary absorption tower, a fan, and a scrubbing tower; the roasting furnace is arranged on one side of the separator, and the roasting furnace is connected to the separator through a pipeline. The Venturi pre-concentrator is arranged on the opposite side of the separator and the roasting furnace, and the Venturi pre-concentrator is connected to the separator through a pipeline and is also connected to the roasting furnace through a pipeline. The absorption tower is arranged on the opposite side of the Venturi pre-concentrator and the separator, and the absorption tower is connected to the Venturi pre-concentrator through a pipeline. The scrubbing tower is arranged on the opposite side of the absorption tower and the Venturi pre-concentrator, and the scrubbing tower is connected to the absorption tower through a pipeline; a water inlet pipe is arranged on the scrubbing tower, and the water inlet pipe is adapted to connect to an external water source; the secondary absorption tower is arranged between the absorption tower and the scrubbing tower, and the secondary absorption tower is used for secondary absorption of substances that are easily soluble in water, and the water inlet pipe is also arranged on the secondary absorption tower; the number of heat exchangers is multiple, a first heat exchanger is arranged between the secondary absorption tower and the scrubbing tower, a second heat exchanger is arranged at the bottom of the side of the secondary absorption tower opposite to the absorption tower, and a third heat exchanger is arranged on one side of the scrubbing tower; the fan is arranged between the first heat exchanger and the scrubbing tower, and the fan is used to draw the flue gas from the secondary absorption tower into the scrubbing tower.

[0006] In a possible implementation manner, the flue gas inlet of the secondary absorption tower is connected to the flue gas outlet of the absorption tower, and the flue gas outlet of the secondary absorption tower is connected to the flue gas inlet of the first heat exchanger.

[0007] In a possible implementation manner, the second heat exchanger is connected to the secondary absorption tower through a pipeline. A cooling water inlet and a cooling water outlet are arranged on the second heat exchanger, and the cooling water inlet of the second heat exchanger is adapted to connect to external cooling water; the liquid inlet of the second heat exchanger is connected to the liquid outlet of the secondary absorption tower.

[0008] In a possible implementation manner, the flue gas outlet of the first heat exchanger is connected to the flue gas inlet of the fan, the flue gas outlet of the fan is connected to the flue gas inlet of the scrubbing tower, and the flue gas outlet of the scrubbing tower is arranged on the opposite side of the flue gas inlet of the scrubbing tower and is used to discharge the flue gas out of the device.

[0009] In a possible implementation manner, a pressure water pump is arranged on the secondary absorption tower, and the liquid outlet of the second heat exchanger is connected to the secondary absorption tower through the pressure water pump.

[0010] In a possible implementation, the third heat exchanger is connected to the scrubbing tower through pipelines; the third heat exchanger is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet of the third heat exchanger is adapted to be connected to external cooling water; the liquid inlet of the third heat exchanger is connected to the liquid outlet of the scrubbing tower.

[0011] In a possible implementation, the pressure water pump is also arranged on the scrubbing tower, and the liquid outlet of the third heat exchanger is connected to the scrubbing tower through the pressure water pump.

[0012] In a possible implementation, a fourth heat exchanger is arranged between the Venturi pre-concentrator and the absorption tower

[0013] In a possible implementation, a spray gun is arranged between the Venturi pre-concentrator and the roasting furnace, and the spray gun sprays the high-concentration waste acid in the Venturi pre-concentrator into the roasting furnace.

[0014] In a possible implementation, the flue gas outlet of the roasting furnace is connected to the flue gas inlet of the separator, the flue gas outlet of the separator is connected to the flue gas inlet of the Venturi pre-concentrator, and the flue gas outlet of the Venturi pre-concentrator is connected to the flue gas inlet of the absorption tower.

[0015] The beneficial effects of the present utility model: By providing a roasting furnace, a separator, a Venturi pre-concentrator, a heat exchanger, an absorption tower, a secondary absorption tower, a fan and a scrubbing tower; the roasting furnace is arranged on one side of the separator, and the roasting furnace is connected to the separator through pipelines, and the flue gas enters the separator from the roasting furnace through the pipelines for separation. The Venturi pre-concentrator is arranged on the opposite side of the separator and the roasting furnace, and the Venturi pre-concentrator is connected to the separator through pipelines. The separated flue gas enters the Venturi pre-concentrator through the pipelines to increase the concentration of the original waste acid in the Venturi pre-concentrator. The Venturi pre-concentrator is connected to the roasting furnace through pipelines. After the concentration of the waste acid is increased, it enters the roasting furnace through the pipelines for circulation;

[0016] The absorption tower is arranged on the opposite side of the Venturi pre-concentrator and the separator, and the absorption tower is connected to the Venturi pre-concentrator through pipelines. The flue gas in the Venturi pre-concentrator enters the absorption tower through the pipelines for the first absorption of harmful substances. The scrubbing tower is arranged on the opposite side of the absorption tower and the Venturi pre-concentrator, and the scrubbing tower is connected to the absorption tower through pipelines; the secondary absorption tower is arranged between the absorption tower and the scrubbing tower. The secondary absorption tower is provided with a water inlet adapted to be connected to an external water source. The flue gas after the first absorption enters the secondary absorption tower through the pipelines. The secondary absorption tower is used for the secondary absorption of substances soluble in water, and the water inlet is also arranged on the scrubbing tower. Such a setting absorbs the harmful substances soluble in water in the flue gas through water;

[0017] The number of heat exchangers is multiple. A first heat exchanger is arranged between the secondary absorption tower and the scrubbing tower. The first heat exchanger is used to exchange heat for the flue gas coming out of the secondary absorption tower to reduce the temperature of the flue gas. A second heat exchanger is arranged at the bottom on the opposite side of the secondary absorption tower from the absorption tower. The second heat exchanger is used to exchange heat for the water in the secondary absorption tower. A third heat exchanger is arranged on one side of the scrubbing tower. The third heat exchanger is used to exchange heat for the water in the scrubbing tower. A blower is arranged between the first heat exchanger and the scrubbing tower. The blower is used to draw the flue gas from the secondary absorption tower into the scrubbing tower. Through the above settings in this application, the flue gas is absorbed multiple times, and the harmful substances in the flue gas are absorbed. Even if the device is used for a long time, the flue gas can meet the national emission standards. Description of the Drawings

[0018] Figure 1 Shows a specific structural schematic diagram of the tail gas emission reduction device of the acid regeneration group in the embodiment of this application. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the 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.

[0020] Examples of the embodiments are shown in the drawings, where the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and should not be construed as a limitation of the present utility model.

[0021] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model or 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, and thus should not be construed as a limitation of the present utility model.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "multiple" means two or more, unless otherwise specifically defined.

[0023] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", "engagement", "hinge" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. 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.

[0024] As Figure 1 shown, the tail gas emission reduction device of the acid regeneration unit includes a roasting furnace 1, a separator 3, a Venturi pre-concentrator 5, a heat exchanger, an absorption tower 7, a secondary absorption tower 9, a fan 13 and a scrubbing tower 15; the roasting furnace 1 is arranged on one side of the separator 3, and the roasting furnace 1 is connected to the separator 3 through a pipeline. The Venturi pre-concentrator 5 is arranged on the opposite side of the separator 3 and the roasting furnace 1, and the Venturi pre-concentrator 5 is connected to the separator 3 through a pipeline, and the Venturi pre-concentrator 5 is also connected to the roasting furnace 1 through a pipeline. The absorption tower 7 is arranged on the opposite side of the Venturi pre-concentrator 5 and the separator 3, and the absorption tower 7 is connected to the Venturi pre-concentrator 5 through a pipeline. The scrubbing tower 15 is arranged on the opposite side of the absorption tower 7 and the Venturi pre-concentrator 5, and the scrubbing tower 17 is connected to the absorption tower 7 through a pipeline; a water inlet pipe is arranged on the scrubbing tower 15, and the water inlet pipe is adapted to connect to an external water source; the secondary absorption tower 9 is arranged between the absorption tower 7 and the scrubbing tower 15, and the secondary absorption tower 9 is used for secondary absorption of substances soluble in water, and the water inlet pipe is also arranged on the secondary absorption tower 9; the number of heat exchangers is multiple, and a first heat exchanger 11 is arranged between the secondary absorption tower and the scrubbing tower, a second heat exchanger 18 is arranged at the bottom on the opposite side of the secondary absorption tower 9 and the absorption tower 7, and a third heat exchanger 17 is arranged on one side of the scrubbing tower 15; the fan 13 is arranged between the first heat exchanger 11 and the scrubbing tower 15, and the fan 13 is used to draw the flue gas of the secondary absorption tower 9 into the scrubbing tower.

[0025] Specifically, the roasting furnace 1 is arranged on one side of the separator 3, and the roasting furnace 1 is connected to the separator 3 through a pipeline. The flue gas enters the separator 3 from the roasting furnace 1 through the pipeline for separation. The Venturi pre-concentrator 5 is arranged on the opposite side of the separator 3 and the roasting furnace 1, and the Venturi pre-concentrator 5 is connected to the separator 3 through a pipeline. The separated flue gas enters the Venturi pre-concentrator 5 through the pipeline to increase the concentration of the original waste acid in the Venturi pre-concentrator 5. The Venturi pre-concentrator 5 is connected to the roasting furnace 1 through a pipeline. After the concentration of the waste acid is increased, it enters the roasting furnace 1 through the pipeline for circulation;

[0026] The absorption tower 7 is arranged on the opposite side of the Venturi pre-concentrator 5 and the separator 3, and the absorption tower 7 is connected by a pipeline to the Venturi pre-concentrator 5. The flue gas in the Venturi pre-concentrator 5 enters the absorption tower 7 through the pipeline for the first absorption of harmful substances. The washing tower 15 is arranged on the opposite side of the absorption tower 7 and the Venturi pre-concentrator 5, and the washing tower 15 is connected by a pipeline to the absorption tower 7; the secondary absorption tower 9 is arranged between the absorption tower 7 and the washing tower 15. The secondary absorption tower 9 is provided with a water inlet pipe suitable for connecting to an external water source. The flue gas that has undergone the first absorption enters the secondary absorption tower 9 through the pipeline. The secondary absorption tower 9 is used for the secondary absorption of substances soluble in water, and the water inlet pipe is also arranged on the washing tower 15. Such an arrangement absorbs the harmful substances soluble in water in the flue gas through water;

[0027] The number of heat exchangers is multiple. A first heat exchanger 11 is arranged between the secondary absorption tower and the washing tower. The first heat exchanger 11 is used for heat exchange of the flue gas coming out of the secondary absorption tower 9 to reduce the temperature of the flue gas. A second heat exchanger 18 is arranged at the bottom on the opposite side of the secondary absorption tower 9 and the absorption tower 7. The second heat exchanger 18 is used for heat exchange of the water in the secondary absorption tower 9. A third heat exchanger 17 is arranged on one side of the washing tower 15. The third heat exchanger 17 is used for heat exchange of the water in the washing tower 15; The fan 13 is arranged between the first heat exchanger 11 and the washing tower 15. The fan 13 is used to draw the flue gas from the secondary absorption tower 9 into the washing tower.

[0028] In a possible implementation manner, the flue gas inlet of the secondary absorption tower 9 is connected to the flue gas outlet of the absorption tower 7, and the flue gas outlet of the secondary absorption tower 9 is connected to the flue gas inlet of the first heat exchanger 11.

[0029] Specifically, as Figure 1 shown, the flue gas enters the interior of the secondary absorption tower 9 through the flue gas outlet of the absorption tower 7 and the flue gas inlet of the secondary absorption tower 9 for another absorption of harmful substances. The absorbed flue gas then enters the first heat exchanger 11 through the flue gas outlet of the secondary absorption tower 9 for heat exchange and temperature reduction.

[0030] In a possible implementation manner, the second heat exchanger 18 is connected by a pipeline to the secondary absorption tower 9. The second heat exchanger 18 is provided with a cooling water inlet and a cooling water outlet. The cooling water inlet of the second heat exchanger 18 is suitable for connecting to external cooling water; the liquid inlet of the second heat exchanger 18 is connected to the liquid outlet of the secondary absorption tower 9; a pressure water pump is arranged on the secondary absorption tower 9, and the liquid outlet of the second heat exchanger 18 is connected to the secondary absorption tower 9 through the pressure water pump.

[0031] Specifically, as Figure 1As shown, water is sprayed through the water inlet pipe of the secondary absorption tower 9, and the water absorbs harmful substances from the flue gas in the secondary absorption tower 9. At this time, the temperature of the water rises, and the water exchanges heat with the cooling water in the second heat exchanger 18 to cool down. The water after heat exchange is sprayed upward from the bottom of the secondary absorption tower 9 through a pressure water pump to absorb harmful substances again.

[0032] In a possible implementation, the flue gas outlet of the first heat exchanger 11 is connected to the flue gas inlet of the fan 13, the flue gas outlet of the fan 13 is connected to the flue gas inlet of the scrubbing tower 15, and the flue gas outlet of the scrubbing tower 15 is arranged on the opposite side of the flue gas inlet of the scrubbing tower 15 and is used to discharge the flue gas outside the device.

[0033] Specifically, as Figure 1 shown, the flue gas enters the first heat exchanger 11 from the secondary absorption tower 9 for heat exchange, and the temperature of the flue gas decreases. The flue gas with reduced temperature enters the scrubbing tower 15 through the suction force of the fan 13, and the flue gas is discharged outside the device through the scrubbing tower 15.

[0034] In a possible implementation, the third heat exchanger 17 is connected to the scrubbing tower 15 through a pipeline; the third heat exchanger 17 is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet of the third heat exchanger 17 is suitable for connecting to external cooling water; the liquid inlet of the third heat exchanger 17 is connected to the liquid outlet of the scrubbing tower 15; a pressure water pump is also arranged on the scrubbing tower, and the liquid outlet of the third heat exchanger 17 is connected to the scrubbing tower 15 through the pressure water pump.

[0035] Specifically, as Figure 1 shown, the flue gas enters the scrubbing tower 15 through the suction force of the fan 13, and water is sprayed through the water inlet pipe of the scrubbing tower 15. The water absorbs harmful substances from the flue gas in the scrubbing tower 15. At this time, the temperature of the water rises, and the water exchanges heat with the cooling water in the third heat exchanger 17 to cool down. The water after heat exchange is sprayed upward from the bottom of the scrubbing tower 15 through a pressure water pump to absorb harmful substances for the last time, and then is discharged outside the device.

[0036] In a possible implementation, a fourth heat exchanger is arranged between the Venturi pre-concentrator 5 and the absorption tower 7.

[0037] In a possible implementation, a spray gun is arranged between the Venturi pre-concentrator 5 and the roasting furnace 1, and the spray gun sprays the high-concentration waste acid in the Venturi pre-concentrator 5 into the roasting furnace 1.

[0038] Specifically, after the original waste acid in the Venturi pre-concentrator 5 is concentrated, its concentration increases. The waste acid with increased concentration is sprayed into the roasting furnace 1 through the spray gun and is heated and decomposed again to form a cycle.

[0039] In a possible implementation, the flue gas outlet of the roasting furnace 1 is connected to the flue gas inlet of the separator 3, the flue gas outlet of the separator 3 is connected to the flue gas inlet of the Venturi pre-concentrator 5, and the flue gas outlet of the Venturi pre-concentrator 5 is connected to the flue gas inlet of the absorption tower 7.

[0040] In this application, a roasting furnace 1, a separator 3, a Venturi pre-concentrator 5, a heat exchanger, an absorption tower 7, a secondary absorption tower 9, a fan 13 and a scrubbing tower 15 are provided; the roasting furnace 1 and the separator 3 are connected by a pipeline, and the flue gas enters the separator 3 from the roasting furnace 1 through the pipeline for separation. The Venturi pre-concentrator 5 and the separator 3 are connected by a pipeline, and the separated flue gas enters the Venturi pre-concentrator 5 through the pipeline to increase the concentration of the original waste acid in the Venturi pre-concentrator 5. The Venturi pre-concentrator 5 and the roasting furnace 1 are connected by a pipeline. After the concentration of the waste acid is increased, it enters the roasting furnace 1 through the pipeline for circulation.

[0041] The absorption tower 7 and the Venturi pre-concentrator 5 are connected by a pipeline, and the flue gas in the Venturi pre-concentrator 5 enters the absorption tower 7 through the pipeline for the first absorption of harmful substances. The scrubbing tower 15 and the absorption tower 7 are connected by a pipeline; the secondary absorption tower 9 is arranged between the absorption tower 7 and the scrubbing tower 15. The secondary absorption tower 9 is provided with a water inlet pipe suitable for connecting to an external water source. The flue gas after the first absorption enters the secondary absorption tower 9 through the pipeline. The secondary absorption tower 9 is used for the secondary absorption of water-soluble substances, and the water inlet pipe is also arranged on the scrubbing tower 15. Such a setting absorbs the water-soluble harmful substances in the flue gas through water.

[0042] A first heat exchanger 11 is arranged between the secondary absorption tower and the scrubbing tower. The first heat exchanger 11 is used for heat exchange of the flue gas coming out of the secondary absorption tower 9 to reduce the temperature of the flue gas. A second heat exchanger 18 is arranged at the bottom on the opposite side of the secondary absorption tower 9 from the absorption tower 7. The second heat exchanger 18 is used for heat exchange of the water in the secondary absorption tower 9. A third heat exchanger 17 is arranged on one side of the scrubbing tower 15. The third heat exchanger 17 is used for heat exchange of the water in the scrubbing tower 15; the fan 13 is arranged between the first heat exchanger 11 and the scrubbing tower 15. The fan 13 is used to draw the flue gas from the secondary absorption tower 9 into the scrubbing tower. Through the above settings in this application, the flue gas can be cooled and absorbed multiple times, and the water in the secondary absorption tower 9 and the water in the scrubbing tower 15 can also be cooled, so that the device can still well absorb the harmful substances in the flue gas during long-term use, solving the problem that during long-term use, the concentration of waste acid and the temperature of the water in the scrubbing tower increase, making it difficult to fully absorb the harmful substances and difficult to meet the national emission standards.

[0043] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the scope disclosed by the present invention, according to the technical solution and concept of the present utility model, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.

Claims

1. An acid regeneration group tail gas emission reduction device, characterized in that: It includes roaster, separator, venturi pre-concentrator, heat exchanger, absorber, secondary absorber, fan and scrubber; The roasting furnace is arranged on one side of the separator, and the roasting furnace and the separator are connected by a pipeline. The venturi preconcentrator is arranged on the opposite side of the separator and the roasting furnace, and the venturi preconcentrator and the separator are connected by a pipeline, and the venturi preconcentrator and the roasting furnace are connected by a pipeline. The absorption tower is arranged on the opposite side of the venturi preconcentrator and the separator, and the absorption tower and the venturi preconcentrator are connected by a pipeline. The washing tower is arranged on the opposite side of the absorption tower and the venturi preconcentrator, and the washing tower and the absorption tower are connected by a pipeline. The washing tower is provided with a water inlet pipe, and the water inlet pipe is suitable for connecting to an external water source; The secondary absorption tower is arranged between the absorption tower and the washing tower, and the secondary absorption tower is used for secondary absorption of substances that are easily soluble in water, and the water inlet pipe is also arranged on the secondary absorption tower; The number of the heat exchangers is multiple, and a first heat exchanger is arranged between the secondary absorption tower and the washing tower, a second heat exchanger is arranged at the bottom of the secondary absorption tower on the side opposite to the absorption tower, and a third heat exchanger is arranged on one side of the washing tower; The fan is arranged between the first heat exchanger and the washing tower, and is used to draw the flue gas from the secondary absorption tower into the washing tower.

2. The tail gas emission reduction device of the acid regeneration group according to claim 1, characterized in that: The flue gas inlet of the secondary absorption tower is connected to the flue gas outlet of the absorption tower, and the flue gas outlet of the secondary absorption tower is connected to the flue gas inlet of the first heat exchanger.

3. The tail gas emission reduction device of the acid regeneration group according to claim 2, characterized in that: The second heat exchanger is connected to the secondary absorption tower by a pipeline, and a cooling water inlet and a cooling water outlet are provided on the second heat exchanger. The cooling water inlet of the second heat exchanger is suitable for connecting external cooling water; The liquid inlet of the second heat exchanger is connected to the liquid outlet of the secondary absorption tower.

4. The tail gas emission reduction device of the acid regeneration group according to claim 3, characterized in that: The smoke outlet of the first heat exchanger is connected to the smoke inlet of the fan, the smoke outlet of the fan is connected to the smoke inlet of the scrubbing tower, and the smoke outlet of the scrubbing tower is arranged on the opposite side of the smoke inlet of the scrubbing tower and is used to discharge the smoke out of the device.

5. The tail gas emission reduction device of the acid regeneration group according to claim 4, characterized in that: The secondary absorption tower is provided with a pressure water pump, and the liquid outlet of the second heat exchanger is connected to the secondary absorption tower through the pressure water pump.

6. The tail gas emission reduction device of the acid regeneration group according to claim 5, characterized in that: The third heat exchanger is connected to the washing tower by a pipeline; the third heat exchanger is provided with a cooling water inlet and a cooling water outlet, and the cooling water inlet of the third heat exchanger is suitable for connecting external cooling water; The liquid inlet of the third heat exchanger is connected to the liquid outlet of the washing tower.

7. The tail gas emission reduction device of the acid regeneration group according to claim 6, characterized in that: The pressure water pump is also arranged on the washing tower, and the liquid outlet of the third heat exchanger is connected to the washing tower through the pressure water pump.

8. The tail gas emission reduction device of the acid regeneration group according to claim 7, characterized in that: A fourth heat exchanger is provided between the venturi pre-concentrator and the absorption tower.

9. The tail gas emission reduction device of the acid regeneration group according to any one of claims 1 to 3, characterized in that: A spray gun is arranged between the Venturi pre-concentrator and the roasting furnace, and the spray gun sprays the high-concentration waste acid of the Venturi pre-concentrator into the roasting furnace.

10. The tail gas emission reduction device of the acid regeneration group according to any one of claims 1 to 3, characterized in that: The smoke outlet of the roasting furnace is connected to the smoke inlet of the separator, the smoke outlet of the separator is connected to the smoke inlet of the venturi preconcentrator, and the smoke outlet of the venturi preconcentrator is connected to the smoke inlet of the absorption tower.

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