Activated carbon pickling acid mist treatment device

Abstract

The utility model relates to an acid mist treatment device for activated carbon pickling. The acid mist treatment device comprises a primary spray tower and a secondary spray tower, an air inlet pipe is arranged on the side wall of the bottom of the first-stage spraying tower, two filler layers I are arranged in the first-stage spraying tower at intervals, a plurality of spraying heads I are arranged above the filler layers I and connected with a water outlet of a clean water pump through pipelines, and a water inlet of the clean water pump is connected with a clean water storage tank through a pipeline; the first-stage spraying tower is communicated with the second-stage spraying tower through a gas conveying pipe; a demisting layer and a filler layer II are sequentially arranged in the second-stage spray tower from top to bottom, a plurality of spray headers II are arranged above the filler layer II, the spray headers II are connected with a water outlet of an alkali liquor pump through pipelines, a water inlet of the alkali liquor pump is connected with an alkali liquor storage tank through a pipeline, and the second-stage spray tower is connected with a centrifugal fan through an exhaust pipe. The device can effectively purify acid mist generated in pickling regeneration operation, ensures that exhausted gas is clean, and thoroughly solves the problem of pollution caused by the acid mist.

Description

Technical Field

[0001] The utility model relates to the technical field of activated carbon preparation, in particular to an activated carbon pickling acid mist treatment device. Background Art

[0002] Activated carbon is widely used in energy, chemical, food, medicine, environmental protection, metallurgy and other fields due to its excellent adsorption properties. In the process of using it in the field of mineral processing, it is often necessary to acid-wash and regenerate the activated carbon. The existing activated carbon acid-washing system is as follows: Figure 1 As shown, the activated carbon is placed in the pickling tank 1, and the pickling liquid (hydrochloric acid, which is highly volatile) prepared in the acid preparation tank 4 is pumped into the pickling tank 1 through the circulating pump 5 to pickle the activated carbon. The overflow liquid after pickling and the acid gas (acid mist) volatilized from the pickling liquid enter the acid preparation tank 4 from the pickling pipeline 2, and the overflow liquid can be recycled, while the acid gas will be extracted by the centrifugal fan 3 and discharged into the air. This means that the acid gas volatilized from the pickling liquid is directly discharged without being treated, which affects the atmospheric environment. At the same time, the acid mist condenses at the discharge port to form "white smoke", and the condensed acidic droplets will corrode the structures around the discharge port.

[0003] Therefore, the present application proposes an activated carbon pickling acid mist treatment device to treat the acid mist discharged from the existing activated carbon pickling system and solve the pollution problem caused by the acid mist. Utility Model Content

[0004] The utility model provides an activated carbon pickling acid mist treatment device.

[0005] The specific technical scheme of the utility model is: an activated carbon pickling acid mist treatment device, comprising a primary spray tower and a secondary spray tower; an air inlet pipe is arranged on the bottom side wall of the primary spray tower, two layers of packing layer I are arranged at intervals in the primary spray tower, a plurality of spray heads I are arranged above the packing layer I, the spray head I is connected to the water outlet of a clean water pump through a pipeline, the water inlet of the clean water pump is connected to a clean water storage tank through a pipeline, and the primary spray tower is connected to the secondary spray tower through an air supply pipe; a demisting layer and a packing layer II are arranged in sequence from top to bottom in the secondary spray tower, a plurality of spray heads II are arranged above the packing layer II, the spray head II is connected to the water outlet of an alkali liquid pump through a pipeline, the water inlet of the alkali liquid pump is connected to an alkali liquid storage tank through a pipeline, and the secondary spray tower is connected to a centrifugal fan through an exhaust pipe.

[0006] Furthermore, preferably, the packing layer I and the packing layer II are both ball ring ceramic packings.

[0007] Furthermore, preferably, the demisting layer is made of FRP filling material.

[0008] Furthermore, preferably, the clean water storage tank is arranged below the primary spray tower.

[0009] Furthermore, preferably, the alkali solution storage tank is arranged below the secondary spray tower.

[0010] Furthermore, preferably, both the clean water storage tank and the alkali solution storage tank are provided with a feed port and a liquid discharge port.

[0011] Furthermore, preferably, a stirring device is also provided in the alkali solution storage tank.

[0012] The beneficial effect of the utility model is that the utility model treats the acid mist by connecting a two-stage absorption tower at the exhaust pipe of the existing activated carbon pickling system. The first-stage absorption tower makes full use of the property that the acid mist is soluble in water, and uses low-cost clean water for primary treatment to adsorb most of the hydrogen chloride gas in the acid mist, and then neutralizes it through the alkali solution of the second-stage absorption tower to obtain clean mist, and then recovers the liquid in the mist through the demisting layer, and finally discharges the clean gas. The use of the device can effectively purify the acid mist generated by the pickling regeneration operation, ensure that the discharged gas is clean, and completely solve the pollution problem caused by the acid mist. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the main view of the existing activated carbon pickling system;

[0014] Figure 2 This is a front view of an activated carbon pickling acid mist treatment device of the utility model;

[0015] Figure 3 This is a working state diagram of an activated carbon pickling acid mist treatment device of the utility model;

[0016] In the figure: 1-pickling tank; 2-pickling pipeline; 3-centrifugal fan; 4-acid preparation tank; 5-circulation pump; 6-first-stage spray tower, 601-air inlet pipe, 602-packing layer I, 603-spray head I, 604-air supply pipe; 7-second-stage spray tower, 701-demist layer, 702-packing layer II, 703-spray head II, 704-exhaust pipe; 8-clean water pump; 9-clean water storage tank; 10-alkali solution pump; 11-alkali solution storage tank; 12-feeding port; 13-draining port; 14-stirring device. DETAILED DESCRIPTION

[0017] In order to make the technical problems and technical solutions solved by the utility model more clearly understood, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0018] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 2 Figure 3 As shown, an activated carbon pickling acid mist treatment device comprises a primary spray tower 6 and a secondary spray tower 7. An air inlet pipe 601 is arranged on the bottom side wall of the primary spray tower 6, two layers of packing layers Ⅰ 602 are arranged at intervals in the primary spray tower 6, a plurality of spray heads Ⅰ 603 are arranged above the packing layer Ⅰ 602, the spray head Ⅰ 603 is connected to the water outlet of the clean water pump 8 through a pipeline, the water inlet of the clean water pump 8 is connected to the clean water storage tank 9 through a pipeline, and the primary spray tower 6 is connected to the secondary spray tower 7 through an air delivery pipe 604; a demisting layer 701 and a packing layer Ⅱ 702 are arranged in sequence from top to bottom in the secondary spray tower 7, a plurality of spray heads Ⅱ 703 are arranged above the packing layer Ⅱ 702, the spray head Ⅱ 703 is connected to the water outlet of the alkali liquid pump 10 through a pipeline, the water inlet of the alkali liquid pump 10 is connected to the alkali liquid storage tank 11 through a pipeline, and the secondary spray tower 7 is connected to the centrifugal fan 3 through an exhaust pipe 704.

[0021] As mentioned above, both packing layer I 602 and packing layer II 702 are ball ring ceramic packings. Ball ring ceramic packings are acid-resistant and corrosion-resistant and are often used in drying towers, absorption towers, and washing towers. They have more evenly distributed voids and a large specific surface area. As a packing layer, they are conducive to the full mixing of acid gas and spray liquid, and can prolong the gas-liquid contact time, so that the acid gas is more dissolved in the spray liquid or reacts with the spray liquid to neutralize. The demisting layer 701 is an FRP filling material, similar to the multi-layer FRP material structure installed in the existing demisting device. When the gas containing mist moves upward at a certain speed, it will collide with the multi-layer FRP material under the action of inertia and adhere to its surface. After diffusion and gravity, it will gradually gather. When the weight reaches a certain amount, it will separate from the FRP material, and the gas will continue to move upward and be discharged. The packing layer I 602, the packing layer II 702 and the demisting layer 701 can also use other materials that can achieve the same effect.

[0022] Working principle: The acid mist (acid gas) discharged from the existing activated carbon pickling system enters from the bottom of the first-level spray tower 6 through the air inlet pipe 601, and the clean water pump 8 is started to supply water to several spray heads Ⅰ603. The acid mist (acid gas) passes through two layers of packing layers Ⅰ602 from bottom to top. Since there are many gaps in the packing layers, the acid mist (acid gas) and the sprayed water are fully in contact in these gaps. Most of the acid gas (i.e. HCl gas) is dissolved in the water and absorbed, and a small part of the acid mist (acid gas) or salt is absorbed. The acid aqueous solution is brought out and enters the secondary spray tower 7. The alkali solution pump 10 is started to supply alkali solution to several spray heads Ⅱ703. The acid mist (acid gas) or hydrochloric acid aqueous solution first passes through the gap of the packing layer Ⅱ702, and fully contacts with the alkali solution sprayed by the spray head Ⅱ703 to cause a neutralization reaction. Then the clean gas and liquid continue to move upward and enter the demisting layer. The gas and liquid gather droplets in the demisting layer, thereby achieving the effect of gas-liquid separation. The separated clean gas is extracted by the centrifugal fan 3 and discharged into the atmosphere.

[0023] The device treats the acid mist by connecting a two-stage absorption tower to the exhaust pipe of the existing activated carbon pickling system. The first-stage absorption tower makes full use of the property that the acid mist is soluble in water, and uses low-cost clean water for primary treatment to adsorb most of the hydrogen chloride gas in the acid mist, and then neutralizes it through the alkali solution of the second-stage absorption tower to obtain clean mist, and then recovers the liquid in the mist through the demisting layer, and finally discharges the clean gas. The use of this device can effectively purify the acid mist generated by the pickling regeneration operation, ensure the cleanness of the discharged gas, and completely solve the pollution problem caused by the acid mist.

[0024] Preferably, in order to make the device more compact, the clean water storage tank 9 is arranged below the primary spray tower 6, and the alkali liquid storage tank 11 is arranged below the secondary spray tower 7. At the same time, in order to facilitate the addition and discharge of liquids in the clean water storage tank 9 and the alkali liquid storage tank 11, a feed port 12 is arranged on one side above the clean water storage tank 9 and the alkali liquid storage tank 11, and a drain port 13 is arranged on the bottom side wall. The alkali liquid storage tank 11 is also provided with a stirring device 14 to ensure the uniformity of the alkali liquid.

[0025] The present invention is described in detail above through specific and preferred embodiments, but those skilled in the art should understand that the present invention is not limited to the embodiments described above, and any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An activated carbon pickling acid mist treatment device, characterized in that: The invention comprises a primary spray tower (6) and a secondary spray tower (7); the bottom side wall of the primary spray tower (6) is provided with an air inlet pipe (601); two layers of packing layer I (602) are arranged in the primary spray tower (6); a plurality of spray heads I (603) are arranged above the packing layer I (602); the spray heads I (603) are connected to the water outlet of a clean water pump (8) through a pipeline; the water inlet of the clean water pump (8) is connected to a clean water storage tank (9) through a pipeline; the primary spray tower (6) is connected to the clean water storage tank (9) through an air supply pipe. (604) is connected to a secondary spray tower (7); a demisting layer (701) and a packing layer II (702) are arranged in sequence from top to bottom in the secondary spray tower (7); a plurality of spray heads II (703) are arranged above the packing layer II (702); the spray heads II (703) are connected to the water outlet of the alkali liquid pump (10) through a pipeline; the water inlet of the alkali liquid pump (10) is connected to the alkali liquid storage tank (11) through a pipeline; and the secondary spray tower (7) is connected to the centrifugal fan (3) through an exhaust pipe (704).

2. The activated carbon pickling acid mist treatment device according to claim 1 is characterized in that: The packing layer I (602) and the packing layer II (702) are both ball ring ceramic packings.

3. The activated carbon pickling acid mist treatment device according to claim 1 is characterized in that: The demisting layer (701) is made of FRP filling material.

4. The activated carbon pickling acid mist treatment device according to claim 1 is characterized in that: The clean water storage tank (9) is arranged below the primary spray tower (6).

5. The activated carbon pickling acid mist treatment device according to claim 1 is characterized in that: The alkali solution storage tank (11) is arranged below the secondary spray tower (7).

6. The activated carbon pickling acid mist treatment device according to claim 1 is characterized in that: The clean water storage tank (9) and the alkali solution storage tank (11) are both provided with a feed inlet (12) and a liquid discharge outlet (13).

7. An activated carbon pickling acid mist treatment device according to claim 5 or 6, characterized in that: A stirring device (14) is also provided in the alkali solution storage box (11).

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