Chemical mixing device for flue gas desulfurization

Abstract

The utility model discloses a medicament mixing device for flue gas desulfurization, which relates to the technical field of waste gas desulfurization and comprises a mixing tank body, a top cover is arranged at the top end of the mixing tank body, a flue gas leading-in pipeline is arranged in the middle of the top cover, and the bottom end of the flue gas leading-in pipeline extends to the inner bottom of the mixing tank body and is used for leading flue gas into the inner bottom of the mixing tank body. Medicament adding mechanisms are arranged on the top cover and are positioned on the two sides of the flue gas introduction pipeline, and are used for introducing a medicament solution for flue gas desulfurization into the mixing tank body; a blow-off pipe is arranged at the bottom end of the mixing tank body, a valve is arranged in the blow-off pipe, and an exhaust pipe is arranged on the side wall of the top of the mixing tank body. According to the flue gas desulfurization device disclosed by the utility model, on the premise of no mechanical stirring, the mixing of flue gas and a flue gas desulfurization medicament can be completed, the flue gas is subjected to desulfurization treatment, and sediments generated in desulfurization reaction can be cleaned at the same time.

Description

Technical Field

[0001] This utility model relates to the field of waste gas desulfurization technology, specifically to a reagent mixing device for flue gas desulfurization. Background Technology

[0002] Flue gas desulfurization reagent mixing refers to the process of using specific reagents (such as calcium hydroxide, limestone, ammonia, etc.) to chemically react with sulfur dioxide in the flue gas during the flue gas desulfurization process, thereby removing sulfur dioxide from the flue gas and reducing environmental pollution. To ensure efficient reaction, the reagents and flue gas need to be thoroughly mixed in the reactor.

[0003] For example, Chinese Patent 202322449392.7 discloses a mixing reaction device for desulfurization wastewater treatment, which uses stirring groups at both the upper and lower parts to stir and mix the upper and lower layers of the solution, making the wastewater and reagents more uniformly mixed.

[0004] However, the above-mentioned mixing reaction device for desulfurization wastewater treatment still has the following shortcomings:

[0005] (1) The operation of the stirring rod and stirring blades relies on an electric drive system, which usually requires additional power to drive the mechanical stirring. This not only increases the energy consumption of the equipment, but also increases the long-term operating cost and maintenance expenses.

[0006] (2) How to efficiently remove solid deposits (such as calcium sulfate) generated by the reaction of reagents with flue gas during the desulfurization process from the device to avoid clogging or affecting the reaction efficiency.

[0007] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0008] In view of the problems in the related technologies, this utility model proposes a reagent mixing device for flue gas desulfurization to overcome the above-mentioned technical problems existing in the existing related technologies.

[0009] Therefore, the specific technical solution adopted by this utility model is as follows:

[0010] A flue gas desulfurization agent mixing device includes a mixing tank. The top of the mixing tank is provided with a top cover, and a flue gas inlet pipe is provided in the middle of the top cover. The bottom end of the flue gas inlet pipe extends to the inner bottom of the mixing tank for introducing flue gas into the inner bottom of the mixing tank. Agent adding mechanisms are provided on the top cover and on both sides of the flue gas inlet pipe for introducing flue gas desulfurization agent solution into the interior of the mixing tank. A drain pipe is provided at the bottom of the mixing tank, and a valve is provided inside the drain pipe. An exhaust pipe is provided on the top side wall of the mixing tank.

[0011] Furthermore, in order to increase the residence time of flue gas in the pipeline and provide more opportunities for reaction with the reagents to improve the desulfurization effect, the flue gas inlet pipeline includes a connecting pipe set in the middle of the top cover. The outer side of the connecting pipe is fixed to the top cover by a connecting plate, and a flue gas duct is set at the bottom end of the connecting pipe. The flue gas duct has a spiral structure and the bottom end of the flue gas duct is an open structure.

[0012] Furthermore, in order to add the reagent solution to the mixing tank, the reagent addition mechanism includes a reagent addition pipe located on the side of the flue gas inlet pipe. The bottom end of the reagent addition pipe extends into the interior of the mixing tank, and several reagent outlets are arranged in a ring on the bottom side wall of the reagent addition pipe. The bottom end of the reagent addition pipe is a closed structure, and a float ball is provided at the bottom end of the reagent addition pipe. The top of the top cover is provided with an annular boss, and several grooves are provided on the inner wall of the annular boss. The bottom end of the grooves communicates with the interior of the mixing tank. Several side protrusions are provided on the outer wall of the reagent addition pipe, which correspond one-to-one with the grooves and slide in cooperation with them.

[0013] Furthermore, to facilitate the discharge of sediment through the drain pipe, the top of the mixing tank and both sides of the top cover are equipped with openable caps, and the top of the openable caps are equipped with handles.

[0014] The beneficial effects of this utility model are as follows:

[0015] (1) This utility model can complete the mixing of flue gas and flue gas desulfurization agent without mechanical stirring, and perform desulfurization treatment on flue gas. At the same time, it can clean the deposits generated in the desulfurization reaction.

[0016] (2) By setting up a flue gas inlet pipe, the flue gas is introduced into the mixing tank using a spiral flue gas duct. The bottom end of the flue gas duct is open, so that the reagent solution in the mixing tank can enter the flue gas duct and fully contact and react with the flue gas. The flue gas flow trajectory in the spiral flue gas duct is more tortuous, which increases the residence time of the flue gas in the pipe and gives it more opportunities to react with the reagent, thereby improving the desulfurization effect.

[0017] (3) By setting up a drug addition mechanism, the drug solution is added into the mixing tank through the drug addition pipe and the drug outlet. The buoyancy of the float ensures that the bottom of the drug addition pipe is always above the liquid surface of the drug solution. With the help of the side protrusion and the chute, the drug addition pipe can rise and fall stably with the liquid surface of the drug solution, so as to avoid the drug outlet being completely covered by the liquid surface of the drug solution and thus not affect the discharge of the drug solution.

[0018] (4) By setting up a drain pipe and an openable cover, when it is necessary to rinse the sediment inside the mixing tank, the openable cover can be removed from the top of the mixing tank, so that the staff can insert the flushing pipe into the mixing tank to rinse the sediment and open the valve to discharge the sediment through the drain pipe. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a flue gas desulfurization agent mixing device according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the mixing tank in a flue gas desulfurization agent mixing device according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the top cover of a flue gas desulfurization agent mixing device according to an embodiment of the present utility model;

[0023] Figure 4 This is a schematic diagram of the flue gas inlet pipe in a flue gas desulfurization agent mixing device according to an embodiment of the present utility model.

[0024] In the picture:

[0025] 1. Mixing tank; 2. Top cover; 3. Flue gas inlet pipe; 301. Connecting pipe; 302. Connecting plate; 303. Flue gas duct; 4. Chemical addition mechanism; 401. Chemical addition pipe; 402. Chemical outlet; 403. Float; 404. Annular boss; 405. Slide groove; 406. Side protrusion; 5. Drain pipe; 6. Valve; 7. Exhaust pipe; 8. Openable cover; 9. Handle. Detailed Implementation

[0026] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0027] According to an embodiment of the present invention, a mixing device for flue gas desulfurization agents is provided.

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1-4 As shown, the flue gas desulfurization agent mixing device according to an embodiment of the present invention includes a mixing tank 1, a top cover 2 at the top of the mixing tank 1, a flue gas inlet pipe 3 in the middle of the top cover 2, and the bottom end of the flue gas inlet pipe 3 extending to the inner bottom of the mixing tank 1 for introducing flue gas into the inner bottom of the mixing tank 1. Agent adding mechanisms 4 are provided on the top cover 2 and on both sides of the flue gas inlet pipe 3 for introducing the flue gas desulfurization agent solution into the interior of the mixing tank 1. A drain pipe 5 is provided at the bottom of the mixing tank 1, a valve 6 is provided inside the drain pipe 5, and an exhaust pipe 7 is provided on the top side wall of the mixing tank 1.

[0029] With the help of the above solution, this utility model can complete the mixing of flue gas and flue gas desulfurization agent without mechanical stirring, and perform desulfurization treatment on flue gas, while also cleaning the deposits generated in the desulfurization reaction.

[0030] In one embodiment, the flue gas inlet pipe 3 includes a connecting pipe 301 located in the middle of the top cover 2. The outer side of the connecting pipe 301 is fixed to the top cover 2 by a connecting plate 302. A flue gas conduit 303 is provided at the bottom end of the connecting pipe 301. The flue gas conduit 303 has a spiral structure and an open bottom end. The spiral structure of the flue gas conduit 303 allows the flue gas to be introduced into the mixing tank 1. The open bottom end of the flue gas conduit 303 allows the reagent solution in the mixing tank 1 to enter the flue gas conduit 303 and fully contact and react with the flue gas. The flue gas flow trajectory in the spiral structure of the flue gas conduit 303 is more tortuous, increasing the residence time of the flue gas in the pipe and providing more opportunities to react with the reagent, thereby improving the desulfurization effect.

[0031] The working principle of the flue gas inlet pipe 3 is as follows: the connecting pipe 301 connects to the external flue gas pipe, allowing the flue gas to enter the flue gas duct 303; the flue gas duct 303 uses a spiral shape to guide the flue gas into the mixing tank 1. The spiral structure makes the flow trajectory of the flue gas more tortuous, thereby increasing the residence time of the flue gas in the pipe and providing more opportunities for full contact and reaction with the reagent solution. The open structure at the bottom allows the reagent solution in the mixing tank to enter the flue gas duct 303 and fully contact the flue gas, promoting the desulfurization reaction.

[0032] In one embodiment, the reagent addition mechanism 4 includes a reagent addition pipe 401 disposed on the side of the flue gas inlet pipe 3. The bottom end of the reagent addition pipe 401 extends into the interior of the mixing tank 1, and a plurality of reagent outlets 402 are arranged in a ring on the bottom sidewall of the reagent addition pipe 401. The bottom end of the reagent addition pipe 401 is a closed structure, and a float ball 403 is disposed at the bottom end of the reagent addition pipe 401. The top of the top cover 2 is provided with an annular boss 404, and the inner wall of the annular boss 404 is provided with a plurality of grooves 405. The bottom end of the grooves 405 is connected to the mixing tank 1. The internal connection is such that the outer wall of the drug addition pipe 401 is provided with several side protrusions 406 that correspond one-to-one with and slide in cooperation with the slide groove 405, so that the drug solution is added into the mixing tank 1 through the drug addition pipe 401 and the drug outlet 402; the buoyancy of the float 403 is used to keep the bottom of the drug addition pipe 401 always above the liquid surface of the drug solution, and with the cooperation of the side protrusions 406 and the slide groove 405, the drug addition pipe 401 can stably rise and fall with the rise and fall of the liquid surface of the drug solution, so as to avoid the drug outlet 402 being completely covered by the liquid surface of the drug solution and not affecting the discharge of the drug solution.

[0033] The working principle of the reagent addition mechanism 4 is as follows: the float 403 ensures that the reagent addition pipe is always above the liquid surface of the reagent solution, preventing the reagent outlet 402 from being covered by the liquid surface, and ensuring that the reagent can be smoothly discharged into the mixing tank 1. In addition, the top end of the reagent addition pipe 401 is connected to the reagent solution through a flexible hose, and the flexible hose will not affect the raising and lowering of the reagent addition pipe 401.

[0034] In one embodiment, for the above-mentioned mixing tank 1, an openable cover 8 is provided at the top of the mixing tank 1 and on both sides of the top cover 2. The top of the openable cover 8 is provided with a handle 9, so that when it is necessary to rinse the sediment inside the mixing tank 1, the openable cover 8 can be removed from the top of the mixing tank 1, so that the staff can insert the flushing pipe into the mixing tank 1 to rinse the sediment, and open the valve 6 to discharge the sediment through the drain pipe 5.

[0035] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0036] Flue gas input:

[0037] Sufficient flue gas desulfurization agent solution is pre-placed in mixing tank 1, with some of the solution entering flue gas duct 303. Flue gas enters mixing tank 1 through flue gas inlet pipe 3. The flue gas enters mixing tank 1 from the bottom of the spiral flue gas duct 303, and due to the spiral structure, the flow path of the flue gas is tortuous, increasing the contact time between the flue gas and the agent solution, allowing the flue gas and agent to mix thoroughly and undergo a desulfurization reaction.

[0038] Adding pharmaceuticals:

[0039] When a chemical solution needs to be added, it is delivered from the top into the mixing tank 1 through the chemical addition pipe 401. Due to the action of the float 403, the bottom of the chemical addition pipe remains above the liquid surface, preventing it from being covered and ensuring that the chemical is evenly discharged into the mixing tank through the chemical discharge port 402. Through the cooperation of the chute 405 and the side protrusion 406, the chemical addition pipe 401 can automatically rise and fall according to changes in the liquid level.

[0040] Desulfurization reaction:

[0041] Inside mixing tank 1, flue gas and the reagent solution are thoroughly mixed, undergoing a chemical reaction to remove sulfur dioxide from the flue gas. Sufficient contact between the reagent solution and the flue gas effectively removes sulfur dioxide, achieving desulfurization. The reagent solution includes ammonia solution, sodium carbonate solution, etc. The ammonia solution or sodium carbonate solution reacts with the sulfur dioxide in the flue gas, removing it and producing salts dissolved in water. Although these salt products are generally soluble, they can form precipitates under supersaturation or temperature changes.

[0042] Sediment discharge:

[0043] After a prolonged desulfurization reaction, solid deposits (such as calcium sulfate) generated from the reaction of the reagents with the flue gas will settle at the bottom of the mixing tank 1. When it is necessary to clean the deposits, the operator can open the retractable cover 8 at the top of the mixing tank and flush the inside of the mixing tank 1 through the flushing pipe. The deposits are carried away by the water flow and discharged through the drain pipe 5. The control of valve 6 ensures that the deposits can be discharged smoothly. Valve 6 can be electric or manual as needed.

[0044] exhaust:

[0045] The flue gas after desulfurization is discharged through exhaust pipe 7. At the same time, it is necessary to ensure that the treated gas meets environmental protection standards after testing.

[0046] In summary, this invention can mix flue gas with flue gas desulfurization agents without mechanical stirring, and perform desulfurization treatment on the flue gas. It can also clean the deposits generated during the desulfurization reaction. By setting up a flue gas inlet pipe 3, the flue gas is introduced into the mixing tank 1 via a spiral-shaped flue gas conduit 303. The bottom end of the flue gas conduit 303 is open, allowing the agent solution in the mixing tank 1 to enter the flue gas conduit 303 and fully contact and react with the flue gas. The more tortuous flow trajectory of the flue gas in the spiral-shaped flue gas conduit 303 increases the residence time of the flue gas in the pipe, providing more opportunities for reaction with the agents and improving the desulfurization effect. By setting up a reagent addition mechanism 4, the reagent solution is added into the mixing tank 1 through the reagent addition pipe 401 and the reagent outlet 402. The buoyancy of the float 403 ensures that the bottom of the reagent addition pipe 401 is always above the surface of the reagent solution. With the cooperation of the side protrusion 406 and the sliding groove 405, the reagent addition pipe 401 can stably rise and fall with the liquid level of the reagent solution, preventing the reagent outlet 402 from being completely covered by the liquid level and ensuring the discharge of the reagent solution is not affected. By setting up a drain pipe 5 and an openable cover 8, when it is necessary to flush the sediment inside the mixing tank 1, the openable cover 8 can be removed from the top of the mixing tank 1, allowing workers to easily insert a flushing pipe into the mixing tank 1 to rinse the sediment, and then open the valve 6 to discharge the sediment through the drain pipe 5.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., 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 connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A medicament mixing device for flue gas desulfurization, comprising a mixing tank body (1), characterized in that, The top end of the mixing tank body (1) is provided with a top cover (2), the middle part of the top cover (2) is provided with a flue gas introduction pipeline (3), the bottom end of the flue gas introduction pipeline (3) extends to the inner bottom of the mixing tank body (1), and is used for introducing flue gas into the inner bottom of the mixing tank body (1); The top cover (2) is provided with a medicament adding mechanism (4) on both sides of the flue gas introduction pipeline (3), which is used for introducing a flue gas desulfurization medicament solution into the inside of the mixing tank body (1); The bottom end of the mixing tank body (1) is provided with a blowdown pipe (5), the inside of the blowdown pipe (5) is provided with a valve (6), and the top side wall of the mixing tank body (1) is provided with an exhaust pipe (7).

2. The flue gas desulfurization agent mixing device according to claim 1, characterized by The flue gas introduction pipeline (3) comprises a connecting pipe (301) arranged in the middle part of the top cover (2), the outer side of the connecting pipe (301) is fixed with the top cover (2) through a connecting plate (302), and the bottom end of the connecting pipe (301) is provided with a flue gas guide pipe (303).

3. The flue gas desulfurization agent mixing device according to claim 2, characterized by The flue gas guide pipe (303) is a spiral structure, and the bottom end of the flue gas guide pipe (303) is an open structure.

4. The flue gas desulfurization agent mixing device according to claim 1, characterized by The medicament adding mechanism (4) comprises a medicament adding pipe (401) arranged on the side of the flue gas introduction pipeline (3), and the bottom end of the medicament adding pipe (401) extends to the inside of the mixing tank body (1); And the bottom side wall of the medicament adding pipe (401) is provided with a plurality of medicament discharge outlets (402) in an annular arrangement.

5. The flue gas desulfurization agent mixing device according to claim 4, characterized by The bottom end of the medicament adding pipe (401) is a closed structure, and the bottom end of the medicament adding pipe (401) is provided with a float ball (403).

6. The flue gas desulfurization agent mixing device according to claim 4, characterized by The top end of the top cover (2) is provided with an annular boss (404), the inner wall of the annular boss (404) is provided with a plurality of sliding grooves (405), and the bottom end of the sliding groove (405) is communicated with the inside of the mixing tank body (1); The outer side wall of the medicament adding pipe (401) is provided with a plurality of side convex strips (406) corresponding to the sliding grooves (405) and in sliding fit.

7. The flue gas desulfurization agent mixing device according to claim 1, characterized by The top end of the mixing tank body (1) and on both sides of the top cover (2) are provided with openable covers (8), and the top end of the openable cover (8) is provided with a handle (9).

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