Anti-crystallization device of acid mist tail gas absorption circulating tank

Abstract

The utility model relates to an anti-crystallization device for an acid mist tail gas absorption circulating tank, and belongs to the technical field of waste gas treatment. The device mainly comprises a liquid circulating tank, a protective plate, a protective cylinder, a stirring mechanism, a circulating mechanism, a hydrometer and a controller, the hydrometer can monitor the concentration condition of inorganic salt in the liquid circulating tank in real time, when it is detected that the concentration of the inorganic salt such as sodium sulfate, sodium chloride and ammonium chloride is increased to the possible crystallization degree along with the reaction, the hydrometer transmits information to the controller, and the controller controls the stirring mechanism to start according to the signal; the stirring mechanism stirs liquid in the liquid circulating tank, so that the formation condition of inorganic salt crystals is destroyed, crystals are prevented from being separated out at the bottom and the side wall of the liquid circulating tank due to increase of inorganic salt concentration, the situation that a crystallization layer is thickened to block a circulating pipeline is avoided, and stable operation of the circulating mechanism is guaranteed; and the liquid circulation system can work normally.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, specifically relating to an anti-crystallization device for an acid mist tail gas absorption and circulation tank. Background Technology

[0002] A large amount of waste gas is generated during inorganic chemical production processes, which needs to be treated by acid mist tail gas absorption towers to meet emission standards. Acid mist tail gas absorption towers are often equipped with liquid circulation tanks at the bottom. When acid mist reacts with alkaline solution to generate inorganic salts, as the concentration of inorganic salts such as sodium sulfate, sodium chloride, and ammonium chloride increases, inorganic salt crystals will precipitate at the bottom and side walls of the liquid circulation tank. At the same time, when the temperature drops in winter, inorganic salt crystals will also precipitate at the bottom and side walls of the liquid circulation tank. As the crystal layer becomes thicker and thicker, it will block the circulation pipeline and cause equipment damage. Utility Model Content

[0003] In order to overcome the problems in the background art, this utility model provides an anti-crystallization device for acid mist tail gas absorption and circulation tank.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: A liquid circulation tank anti-crystallization device for acid mist tail gas absorption circulation tank mainly includes a liquid circulation tank, a protective plate, a protective cylinder, a stirring mechanism, a circulation mechanism, a hydrometer, and a controller. The liquid circulation tank has a hollow internal structure. The protective plate is installed inside the liquid circulation tank, and a circular hole is provided on the protective plate to facilitate liquid flow. The protective cylinder, which is connected to the bottom of the acid mist tail gas absorption tower, is installed on the protective plate. The stirring mechanism is installed inside the liquid circulation tank, and the circulation mechanism is installed on one side of the liquid circulation tank and communicates with the bottom of the liquid circulation tank. The hydrometer is installed inside the liquid circulation tank, and the controller is installed on the side wall of the liquid circulation tank. The stirring mechanism, the circulation mechanism, the hydrometer, and the controller are electrically connected.

[0005] The protective casing is equipped with a steam conveying mechanism, which includes a conveying pipe, an electric shut-off valve, a support plate, a diverter pipe, and a nozzle. The conveying pipe for conveying steam is installed on the side wall of the liquid circulation tank, the electric shut-off valve is installed on the conveying pipe, the support plate is installed on the protective casing, the diverter pipe is installed on the support plate at equal intervals around its circumference, the nozzle is installed on the diverter pipe, the conveying pipe extends into the liquid circulation tank and communicates with the diverter pipe, and the electric shut-off valve is electrically connected to the controller.

[0006] The stirring mechanism includes a rotating shaft, a motor, stirring blades, a spiral stirring blade, and a stirring paddle. The rotating shaft is rotatably installed inside the liquid circulation tank. The motor is installed on the side wall of the liquid circulation tank and is connected to the rotating shaft via a drive. The stirring blades are installed on the rotating shaft at equal intervals. The spiral stirring blade is installed on the rotating shaft. The stirring paddle is installed at the end of the rotating shaft. The motor is electrically connected to the controller.

[0007] The circulation mechanism includes a circulation pipe and a vertical circulation pump. One end of the circulation pipe is connected to the bottom of the liquid circulation tank, and the other end is connected to the acid mist tail gas absorption tower. The vertical circulation pump is installed on the circulation pipe and is electrically connected to the controller.

[0008] The beneficial effects of this utility model are:

[0009] The hydrometer can monitor the concentration of inorganic salts in the liquid circulation tank in real time. When it detects that the concentration of inorganic salts such as sodium sulfate, sodium chloride, and ammonium chloride increases to a level that may cause crystallization as the reaction proceeds, the hydrometer transmits the information to the controller. The controller then controls the stirring mechanism to start based on the signal. The stirring mechanism stirs the liquid in the liquid circulation tank, thereby disrupting the conditions for inorganic salt crystallization and preventing crystallization from occurring at the bottom and side walls of the liquid circulation tank due to the increased concentration of inorganic salts. This avoids the situation where the crystal layer thickens and blocks the circulation pipeline, ensuring the stable operation of the circulation mechanism and the normal operation of the liquid circulation system. Attached Figure Description

[0010] Figure 1 This is an isometric schematic diagram of the present invention.

[0011] Figure 2 This is a three-dimensional schematic diagram of the present invention.

[0012] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0013] Figure 4 This is another three-dimensional schematic diagram of this utility model.

[0014] Figure 5 This is a partial cross-sectional view of the present invention.

[0015] Figure 6 This is a schematic diagram of the stirring mechanism. Detailed Implementation

[0016] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0017] This utility model discloses an anti-crystallization device for an acid mist tail gas absorption and circulation tank. The anti-crystallization device for an acid mist tail gas absorption and circulation tank mainly includes a liquid circulation tank 1, a protective plate 2, a protective cylinder 3, a stirring mechanism 4, a circulation mechanism 5, a hydrometer 6, and a controller 7. The liquid circulation tank 1 has a hollow internal structure. The protective plate 2 is installed inside the liquid circulation tank 1, and the protective plate 2 has a circular hole 21 for easy liquid flow. The protective cylinder 3, which is connected to the bottom of the acid mist tail gas absorption tower, is installed on the protective plate 2. The stirring mechanism 4 is installed inside the liquid circulation tank 1. The circulation mechanism 5 is installed on one side of the liquid circulation tank 1 and communicates with the bottom of the liquid circulation tank 1. The hydrometer 6 is installed inside the liquid circulation tank 1. The controller 7 is installed on the side wall of the liquid circulation tank 1. The stirring mechanism 4, the circulation mechanism 5, the hydrometer 6, and the controller 7 are electrically connected.

[0018] like Figure 3 As shown, a steam conveying mechanism 8 is installed on the protective casing 3. The steam conveying mechanism 8 includes a conveying pipe 81, an electric shut-off valve 82, a support plate 83, a diversion pipe 84, and a nozzle 85. The conveying pipe 81 for conveying steam is installed on the side wall of the liquid circulation tank 1. The electric shut-off valve 82 is installed on the conveying pipe 81. The support plate 83 is installed on the protective casing 3. The diversion pipe 84 is installed on the support plate 83 at equal intervals around its circumference. The nozzle 85 is installed on the diversion pipe 84. The conveying pipe 81 extends into the liquid circulation tank 1 and communicates with the diversion pipe 84. The electric shut-off valve 82 is electrically connected to the controller 7. When the hydrometer 6 detects that parameters such as the inorganic salt concentration or liquid temperature are close to the crystallization critical value, and the stirring effect of the stirring mechanism 4 may not be sufficient, the hydrometer 6 sends a signal to the controller 7. Upon receiving the signal, 7 opens the electric shut-off valve 82, and steam begins to flow through the delivery pipe 81. The delivery pipe 81 delivers the steam to the distribution pipe 84 inside the liquid circulation tank 1. The distribution pipe 84 is installed on the support plate 83 at equal intervals around its circumference. The steam is evenly sprayed into the liquid circulation tank 1 by the nozzles 85 on the distribution pipe 84. The sprayed steam can increase the temperature of the liquid and reduce the solubility of inorganic salts, thereby preventing the crystallization of inorganic salts. It can also work in conjunction with the stirring mechanism 4 to better prevent the formation of crystals. When the hydrometer 6 detects that the liquid parameters have returned to the normal range, it sends a signal to the controller 7. The controller 7 closes the electric shut-off valve 82, stops the steam delivery, and the nozzles 85 stop spraying steam. The device continues to operate normally, mainly relying on the stirring mechanism 4 to maintain the normal state of the liquid and prevent crystallization.

[0019] like Figure 5 , Figure 6As shown, the stirring mechanism 4 includes a rotating shaft 41, a motor 42, stirring blades 43, a spiral stirring blade 44, and a stirring paddle 45. The rotating shaft 41 is rotatably installed inside the liquid circulation tank 1. The motor 42 is installed on the side wall of the liquid circulation tank 1, and the rotating shaft 41 is connected to the motor 42 in a transmission connection. The stirring blades 43 are installed on the rotating shaft 41 at equal intervals. The spiral stirring blades 44 are installed on the rotating shaft 41, and the stirring paddle 45 is installed at the end of the rotating shaft 41. The motor 42 is electrically connected to the controller 7. The motor 42 drives the rotating shaft 41 to rotate, and the stirring blades 43, spiral stirring blades 44, and stirring paddle 45 on the rotating shaft 41 begin to stir the liquid in the liquid circulation tank 1. The stirring blades 43 prevent the local inorganic salt concentration from becoming too high through conventional stirring. The spiral stirring blades 44 can promote the liquid to flow from bottom to top while stirring. The stirring paddle 45 at the end of the rotating shaft 41 further enhances the stirring effect. By stirring, the crystallization conditions of inorganic salts are disrupted, preventing crystals from precipitating at the bottom and side wall of the liquid circulation tank 1.

[0020] like Figure 2 , Figure 4 As shown, the circulation mechanism 5 includes a circulation pipe 51 and a vertical circulation pump 52. One end of the circulation pipe 51 is connected to the bottom of the liquid circulation tank 1, and the other end is connected to the acid mist tail gas absorption tower. The vertical circulation pump 52 is installed on the circulation pipe 51 and is electrically connected to the controller 7. The vertical circulation pump 52 in the circulation mechanism 5 draws liquid from the bottom of the liquid circulation tank 1 through the circulation pipe 51 and sends it back to the acid mist tail gas absorption tower to realize the circulation of liquid, which can prevent the local accumulation of inorganic salts.

[0021] Work process:

[0022] After the acid mist exhaust gas enters the absorption tower, it reacts with the alkaline solution to generate inorganic salts. The reacted liquid falls into the liquid circulation tank 1. The circular holes 21 on the protective plate 2 allow the liquid to fall smoothly, enabling the liquid from the acid mist exhaust gas absorption tower to fall more evenly and orderly, so that the acid mist and alkaline solution react more fully in the liquid circulation tank 1. The hydrometer 6 monitors the change in the specific gravity of the liquid in the liquid circulation tank 1 in real time and transmits the data to the controller 7. When the concentration of inorganic salts increases, causing the specific gravity to increase, the controller 7 starts the stirring mechanism 4 and the circulation mechanism 5. The motor 42 in the stirring mechanism 4 drives the rotating shaft 41 to rotate, and the stirring blades 43, spiral stirring blades 44 and stirring paddles 45 rotate accordingly, stirring the liquid in the liquid circulation tank 1 to make it evenly distributed and avoid local high concentrations that lead to crystallization. At the same time, the vertical circulation pump 52 in the circulation mechanism 5 pumps the liquid from the liquid circulation tank 1 through the circulation pipe 51. The liquid is extracted from the bottom and returned to the acid mist tail gas absorption tower to achieve liquid circulation, which can prevent the local accumulation of inorganic salts. In addition, the steam conveying mechanism 8 can also play a role in preventing crystallization. When the temperature is too low in winter and the stirring mechanism 4 cannot guarantee the increase of the liquid specific gravity, the hydrometer 6 transmits data to the controller 7. The controller 7 activates the electric shut-off valve 82 to introduce steam into the liquid circulation tank 1. The steam enters the diversion pipe 84 through the conveying pipe 81 and is sprayed out from the nozzle 85. The heat of the steam can prevent the liquid from crystallizing in the low temperature environment and promote the dissolution of various inorganic salt mixtures such as sodium sulfate, sodium chloride, and ammonium chloride. Throughout the process, the controller 7 automatically controls the operation of the stirring mechanism 4, the circulation mechanism 5, and the steam conveying mechanism 8 according to the feedback signal of the hydrometer 6 to achieve intelligent anti-crystallization control.

[0023] Through the above working process, this anti-crystallization device for acid mist tail gas absorption and circulation tank can effectively prevent inorganic salt crystallization, ensure the normal operation of acid mist tail gas absorption and circulation tank, improve tail gas treatment effect, reduce equipment damage, adapt to low temperature environment in winter, and improve production efficiency and environmental protection and energy saving level.

[0024] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. An acid mist tail gas absorption loop anti-crystallization device, characterized in that: The acid mist tail gas absorption circulating tank anti-crystallization device comprises a liquid circulating tank (1), a guard plate (2), a guard cylinder (3), a stirring mechanism (4), a circulating mechanism (5), a specific gravity meter (6), a controller (7), the liquid circulating tank (1) is internally hollow, the guard plate (2) is installed in the liquid circulating tank (1), a plurality of round holes (21) for facilitating liquid falling are formed in the guard plate (2), the guard cylinder (3) connected with the bottom end of the acid mist tail gas absorption tower is installed on the guard plate (2), the stirring mechanism (4) is installed in the liquid circulating tank (1), the circulating mechanism (5) is installed on one side of the liquid circulating tank (1) and is in communication with the bottom end of the liquid circulating tank (1), the specific gravity meter (6) is installed in the liquid circulating tank (1), the controller (7) is installed on the side wall of the liquid circulating tank (1), and the stirring mechanism (4), the circulating mechanism (5), the specific gravity meter (6) and the controller (7) are electrically connected.

2. The acid mist tail gas absorption circulating tank anti-crystallization device according to claim 1, characterized in that: The guard cylinder (3) is provided with a steam conveying mechanism (8), the steam conveying mechanism (8) comprises a conveying pipe (81), an electric shut-off valve (82), a support plate (83), a shunt pipe (84) and a spray head (85), the conveying pipe (81) for conveying steam is installed on the side wall of the liquid circulating tank (1), the electric shut-off valve (82) is installed on the conveying pipe (81), the support plate (83) is installed on the guard cylinder (3), the shunt pipes (84) are circumferentially and equidistantly installed on the support plate (83), the spray head (85) is installed on the shunt pipe (84), the conveying pipe (81) extends into the liquid circulating tank (1) and is in communication with the shunt pipe (84), and the electric shut-off valve (82) is electrically connected with the controller (7).

3. The acid mist tail gas absorption circulating tank anti-crystallization device according to claim 1 or 2, characterized in that: The stirring mechanism (4) comprises a rotating shaft (41), a motor (42), stirring blades (43), spiral stirring blades (44) and stirring paddles (45), the rotating shaft (41) is rotatably installed in the liquid circulating tank (1), the motor (42) is installed on the side wall of the liquid circulating tank (1), the rotating shaft (41) is in transmission connection with the motor (42), the stirring blades (43) are equidistantly installed on the rotating shaft (41), the spiral stirring blades (44) are installed on the rotating shaft (41), the stirring paddles (45) are installed on the end portion of the rotating shaft (41), and the motor (42) is electrically connected with the controller (7).

4. The acid mist tail gas absorption circulating tank anti-crystallization device according to claim 1 or 2, characterized in that: The circulating mechanism (5) comprises a circulating pipe (51) and a vertical circulating pump (52), one end of the circulating pipe (51) is connected with the bottom end of the liquid circulating tank (1), the other end is connected with the acid mist tail gas absorption tower, and the vertical circulating pump (52) is installed on the circulating pipe (51). The vertical circulating pump (52) is electrically connected with the controller (7).

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