A waste gas treatment device for replacing hydrochloric acid with sulfuric acid in a titanium white bleaching process

Abstract

The utility model provides a kind of waste gas treatment device of hydrochloric acid replacement sulfuric acid in titanium dioxide bleaching process, belong to waste gas treatment technical field, including spray tower, the bottom fixedly connected with air inlet pipe of spray tower, gas concentration sensor is installed on the air inlet pipe, the top fixedly connected with exhaust pipe of spray tower, two first annular tubes are equipped in the spray tower, two the first annular tube is fixedly connected with spray tower respectively by fixed sheet. The utility model is provided with gas concentration sensor, PH sensor, controller, concentration increasing mechanism and concentration reducing mechanism, realizes real-time monitoring waste gas concentration, can adjust the concentration of absorption liquid according to the concentration of waste gas, help better capture and neutralize harmful substances in waste gas, optimize the treatment effect of waste gas, solve the problem that the treatment effect of waste gas is not good in prior art due to the inconvenience of adjusting absorption liquid concentration according to waste gas concentration.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, and more specifically, to a waste gas treatment device that uses hydrochloric acid to replace sulfuric acid in the titanium dioxide bleaching process. Background Technology

[0002] In the titanium dioxide bleaching process, traditional waste gas treatment methods often use sulfuric acid as the primary chemical agent. However, the use of sulfuric acid not only poses significant environmental risks but also generates large amounts of acidic waste gas and liquid, severely threatening the ecological environment. Hydrochloric acid, a common inorganic acid, shares some chemical similarities with sulfuric acid but exhibits a more pronounced advantage in terms of environmental friendliness. Using hydrochloric acid instead of sulfuric acid for titanium dioxide bleaching can not only reduce the emission of harmful waste gases but also lower the difficulty and cost of waste liquid treatment. The waste gas emitted when using hydrochloric acid instead of sulfuric acid still requires further treatment.

[0003] Currently, the following problems exist in the treatment of waste gas:

[0004] (1) Traditional waste gas treatment devices treat waste gas by spraying towers. However, the spraying towers in the existing technology are not convenient to adjust the concentration of the spray liquid according to the concentration of waste gas. For example, if the concentration of waste gas is high and the concentration of spray liquid is low, the waste gas treatment effect will be poor. If the concentration of waste gas is low and the concentration of spray liquid is high, the spray liquid will be wasted.

[0005] (2) Traditional spray towers have poor uniformity in spraying waste gas and it is inconvenient to adjust the spray flow rate, resulting in poor waste gas treatment effect.

[0006] Therefore, we have made improvements and proposed a waste gas treatment device that uses hydrochloric acid instead of sulfuric acid in the titanium dioxide bleaching process. Utility Model Content

[0007] The purpose of this invention is to address the current problems of inconvenience in optimizing waste gas treatment based on its concentration and poor uniformity of spraying.

[0008] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0009] A waste gas treatment device that replaces sulfuric acid in the titanium dioxide bleaching process is proposed to improve the above-mentioned problems.

[0010] The present invention is as follows:

[0011] The system includes a spray tower, with an air inlet pipe fixedly connected to its bottom and a gas concentration sensor installed on the inlet pipe. An exhaust pipe is fixedly connected to the top of the spray tower. The spray tower contains two first annular pipes, each fixedly connected to the tower via a fixing plate. Each first annular pipe is fixedly connected to a second annular pipe via a first connecting pipe. The second annular pipes are fixedly connected to a central pipe via a second connecting pipe. Spray nozzles are evenly distributed on the lower ends of the first, second, and central annular pipes. A liquid storage tank is located on one side of the spray tower. A delivery pump is fixedly connected to the upper end of the tank. A liquid extraction pipe is fixedly connected to the input end of the delivery pump. The bottom end of the liquid extraction pipe passes through the storage tank and extends into its interior. A liquid outlet pipe is fixedly connected to the output end of the liquid extraction pipe. A first solenoid valve is fixedly connected to the top end of the liquid outlet pipe. A branch pipe is fixedly connected to the top end of the first solenoid valve. Both ends of the branch pipe pass through the spray tower and are respectively connected to the first ring pipe. A pH sensor and a controller are installed on the storage tank. The storage tank is equipped with a concentration increasing mechanism and a concentration decreasing mechanism. A stirring mechanism is installed inside the storage tank.

[0012] As a preferred technical solution of this utility model, the concentration increasing mechanism includes a first inlet pipe fixed to the upper end face of the storage tank, a second solenoid valve fixedly connected to the top end of the first inlet pipe, a first electromagnetic flow meter fixedly connected to the upper end face of the second solenoid valve, and a concentrate cylinder fixedly connected to the upper end face of the first electromagnetic flow meter.

[0013] As a preferred technical solution of this utility model, the concentration reduction mechanism includes a second inlet pipe fixed to the upper end face of the storage tank, a third solenoid valve fixedly connected to the upper end face of the second inlet pipe, a second electromagnetic flow meter fixedly connected to the upper end face of the third solenoid valve, and a dilution cylinder fixedly connected to the upper end face of the second electromagnetic flow meter.

[0014] As a preferred technical solution of this utility model, the stirring mechanism includes two bearings symmetrically fixed to the upper end face of the liquid storage tank. A stirring shaft is fixedly connected to the inner side wall of the inner ring of each of the two bearings. The bottom end of the stirring shaft passes through the liquid storage tank and extends into its interior. A set of stirring paddles is uniformly fixedly connected to the stirring shaft. A pulley is fixedly connected to the top end of each stirring shaft. The pulleys are connected to each other by a synchronous belt drive. A driven gear is fixedly connected to the rear stirring shaft. A motor is fixedly connected to the upper end face of the liquid storage tank. A driving gear that meshes with the driven gear is fixedly connected to the drive end of the motor.

[0015] As a preferred technical solution of this utility model, a drain pipe is fixedly connected to the bottom of the spray tower, and a control valve is installed at the outer end of the drain pipe.

[0016] As a preferred embodiment of this invention, the gas concentration sensor, the first solenoid valve, and the pH sensor are electrically connected to the controller.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] In the solution of this utility model:

[0019] 1. By setting up a gas concentration sensor, pH sensor, controller, concentration increasing mechanism and concentration decreasing mechanism, the waste gas concentration can be monitored in real time. The concentration of the absorbent can be adjusted according to the concentration of the waste gas, which helps to better capture and neutralize harmful substances in the waste gas, optimize the waste gas treatment effect, and solve the problem of poor waste gas treatment effect caused by the inconvenience of adjusting the absorbent concentration according to the waste gas concentration in the existing technology.

[0020] 2. By setting up a first ring pipe, a fixing plate, a first connecting pipe, a second ring pipe, a second connecting pipe, a central pipe, a nozzle, a branch pipe, and a first solenoid valve, the absorption liquid is sprayed evenly onto the waste gas, reducing the occurrence of spray dead zones, allowing for adjustment of the spray flow rate, improving the waste gas treatment effect, and solving the problems of poor spray uniformity and inconvenience in adjusting the spray flow rate in the prior art. Attached Figure Description

[0021] Figure 1 A schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 A schematic diagram of the rear structure provided by this utility model;

[0024] Figure 4 A schematic diagram of the structure of the liquid storage tank and its connecting components provided by this utility model;

[0025] Figure 5 A schematic diagram of the internal structure of the liquid storage tank provided by this utility model;

[0026] Figure 6 Provided by this utility model Figure 3 Enlarged view of point A in the middle.

[0027] The image shows:

[0028] 1. Spray tower; 2. Inlet pipe; 3. Gas concentration sensor; 4. Exhaust pipe; 5. First loop pipe; 6. Fixing plate; 7. First connecting pipe; 8. Second loop pipe; 9. Second connecting pipe; 10. Central pipe; 11. Spray head; 12. Liquid storage tank; 13. Transfer pump; 14. Liquid extraction pipe; 15. Liquid outlet pipe; 16. First solenoid valve; 17. Branch pipe; 18. pH sensor; 19. Controller; 20. Concentration enhancement mechanism; 2001. First inlet pipe; 2002. Second... Solenoid valve; 2003, First electromagnetic flowmeter; 2004, Concentrate cylinder; 21, Concentration reduction mechanism; 2101, Second inlet pipe; 2102, Third solenoid valve; 2103, Second electromagnetic flowmeter; 2104, Dilution cylinder; 22, Stirring mechanism; 2201, Bearing; 2202, Stirring shaft; 2203, Stirring paddle; 2204, Pulley; 2205, Synchronous belt; 2206, Driven gear; 2207, Motor; 2208, Drive gear; 23, Drain pipe. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0030] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, this embodiment proposes a waste gas treatment device for replacing sulfuric acid with hydrochloric acid in the titanium dioxide bleaching process. It includes a spray tower 1, with an inlet pipe 2 fixedly connected to the bottom of the spray tower 1. A gas concentration sensor 3 is installed on the inlet pipe 2. An exhaust pipe 4 is fixedly connected to the top of the spray tower 1. Two first annular pipes 5 are provided inside the spray tower 1, and the two first annular pipes 5 are respectively fixedly connected to the spray tower 1 via fixing plates 6. The two first annular pipes 5 are respectively fixedly connected to second annular pipes 8 via first connecting pipes 7, and the second annular pipes 8 are fixedly connected via second connecting pipes 9. The spray tower 1 has a central pipe 10, a first ring pipe 5, a second ring pipe 8, and spray nozzles 11 evenly distributed on the lower end face of the central pipe 10. A storage tank 12 is provided on one side of the spray tower 1. A transfer pump 13 is fixedly connected to the upper end face of the storage tank 12. A suction pipe 14 is fixedly connected to the input end of the transfer pump 13. The bottom end of the suction pipe 14 penetrates the storage tank 12 and extends into it. An outlet pipe 15 is fixedly connected to the output end of the suction pipe 14. A first solenoid valve 16 is fixedly connected to the top end of the outlet pipe 15. A branch pipe 17 is fixedly connected to the top end of the first solenoid valve 16. Both ends of branch pipe 17 pass through spray tower 1 and are connected to the first ring pipe 5 respectively. A pH sensor 18 and a controller 19 are installed on the storage tank 12. The storage tank 12 is equipped with a concentration increasing mechanism 20 and a concentration decreasing mechanism 21. A stirring mechanism 22 is installed inside the storage tank 12. Exhaust gas enters spray tower 1 through inlet pipe 2. Gas concentration sensor 3 can monitor the concentration of exhaust gas in real time and transmit the data to controller 19. As the exhaust gas rises within spray tower 1, it passes through two first ring pipes 5, a second ring pipe 8, and a central pipe 10. The spray liquid is drawn from the storage tank 12 by the transfer pump 13, enters the first ring pipe 5 through the extraction pipe 14 and the outlet pipe 15, and then enters the second ring pipe 8 and the central pipe 10 through the first connecting pipe 7 and the second connecting pipe 9 respectively. Then it is sprayed out through the nozzle 11. The waste gas and the spray liquid are in full contact in the spray tower 1 to achieve the purification treatment of the waste gas. The flow rate of the spray liquid can be controlled by the first solenoid valve 16. The waste gas and the spray liquid are in full contact in the spray tower 1 to achieve the purification treatment of the waste gas. The treated gas is discharged through the exhaust pipe 4.

[0031] like Figure 1 and Figure 4As shown, in a preferred embodiment, based on the above method, the concentration increasing mechanism 20 further includes a first inlet pipe 2001 fixed to the upper end face of the storage tank 12, a second solenoid valve 2002 fixedly connected to the top end of the first inlet pipe 2001, a first electromagnetic flow meter 2003 fixedly connected to the upper end face of the second solenoid valve 2002, and a concentrate cylinder 2004 fixedly connected to the upper end face of the first electromagnetic flow meter 2003. When it is necessary to increase the concentration of the spray liquid in the storage tank 12, the controller 19 will open the second solenoid valve 2002, and the inorganic alkaline liquid in the concentrate cylinder 2004 will flow into the storage tank 12 through the first inlet pipe 2001 and the second solenoid valve 2002. The first electromagnetic flow meter 2003 is used to monitor the flow rate of the inflowing liquid to ensure that the amount of concentrate added is accurate and controllable.

[0032] like Figure 1 and Figure 4 As shown, in a preferred embodiment, based on the above method, the concentration reduction mechanism 21 further includes a second inlet pipe 2101 fixed to the upper end face of the storage tank 12, a third solenoid valve 2102 fixedly connected to the upper end face of the second inlet pipe 2101, a second electromagnetic flow meter 2103 fixedly connected to the upper end face of the third solenoid valve 2102, and a dilution cylinder 2104 fixedly connected to the upper end face of the second electromagnetic flow meter 2103. When it is necessary to reduce the concentration of the spray liquid in the storage tank 12, the controller 19 will open the third solenoid valve 2102, and the diluent in the dilution cylinder 2104 will flow into the storage tank 12 through the second inlet pipe 2101 and the third solenoid valve 2102. The second electromagnetic flow meter 2103 is used to monitor the flow rate of the diluent to ensure that the amount of diluent added is accurate and controllable.

[0033] like Figure 3 , Figure 5 and Figure 6As shown, in a preferred embodiment, based on the above method, the stirring mechanism 22 further includes two bearings 2201 symmetrically fixed to the upper end face of the storage tank 12. A stirring shaft 2202 is fixedly connected to the inner sidewall of the inner ring of each bearing 2201. The bottom end of the stirring shaft 2202 penetrates the storage tank 12 and extends into it. A set of stirring paddles 2203 are uniformly fixedly connected to the stirring shaft 2202. A pulley 2204 is fixedly connected to the top end of each stirring shaft 2202. The pulleys 2204 are connected to each other via a synchronous belt 2205. A driven gear 2206 is fixedly connected to the rear stirring shaft 2202. The upper end of the storage tank 12... A motor 2207 is fixedly connected to the end face, and a drive gear 2208 that meshes with the driven gear 2206 is fixedly connected to the drive end of the motor 2207. The motor 2207 drives the drive gear 2208 to rotate, and the rotation of the drive gear 2208 drives the driven gear 2206 and the stirring shaft 2202 connected to it to rotate. The rotation of the stirring shaft 2202 drives the pulley 2204 to rotate. Through the transmission of the synchronous belt 2205, another stirring shaft 2202 can be rotated, thereby causing the stirring paddle 2203 to rotate. When increasing or decreasing the concentration of the absorbent, the concentration of the absorbent can be made fast and uniform.

[0034] like Figure 3 As shown, in a preferred embodiment, based on the above method, a drain pipe 23 is fixedly connected to the bottom of the spray tower 1, and a control valve is installed at the outer end of the drain pipe 23 to realize the periodic discharge of waste liquid.

[0035] like Figure 1 As shown, in a preferred embodiment, based on the above method, the gas concentration sensor 3, the first solenoid valve 16, and the pH sensor 18 are further electrically connected to the controller 19. The gas concentration sensor 3 monitors the exhaust gas concentration in real time and transmits the data to the controller 19. The controller 19 adjusts the opening of the first solenoid valve 16 according to the exhaust gas concentration, thereby controlling the flow rate of the spray liquid. The pH sensor 18 monitors the pH of the spray liquid in the storage tank 12 in real time and transmits the data to the controller 19. The controller 19 adjusts the working state of the concentration increasing mechanism 20 and the concentration decreasing mechanism 21 according to the pH data to ensure that the pH of the spray liquid meets the requirements.

[0036] Specifically, in the waste gas treatment device for replacing sulfuric acid in this titanium dioxide bleaching process, the waste gas is introduced into the spray tower 1 through the inlet pipe 2. The transfer pump 13 draws the absorbent from the storage tank 12, and it enters the first ring pipe 5 through the extraction pipe 14 and the outlet pipe 15. Then, it enters the second ring pipe 8 and the central pipe 10 through the first connecting pipe 7 and the second connecting pipe 9, respectively. Finally, it is sprayed out through the nozzle 11. The waste gas and the spray liquid are in full contact in the spray tower 1 to achieve the purification treatment of the waste gas. The purified waste gas is discharged through the exhaust pipe. The exhaust gas is discharged through pipe 4; during the intake process, the gas concentration sensor 3 monitors the concentration of the exhaust gas. When the monitored concentration is high, the controller 19 controls the first solenoid valve 16 to increase the flow rate. Then, the controller 19 adjusts the concentration according to the value of the pH sensor 18, which will open the second solenoid valve 2002. The inorganic alkaline liquid in the concentrate cylinder 2004 flows into the storage tank 12 through the first inlet pipe 2001 and the second solenoid valve 2002. The first electromagnetic flowmeter 2003 monitors the flow rate of the added inorganic alkaline liquid and stops adding it in time when the required amount is reached. Increasing the concentration of the absorbent helps to better capture and neutralize harmful substances in the exhaust gas. When the gas concentration sensor 3 detects a low concentration of exhaust gas, the controller 19 controls the first solenoid valve 16 to reduce the flow rate. If the concentration of the absorbent in the storage tank 12 detected by the pH sensor 18 is high, the controller 19 will open the third solenoid valve 2102. The diluent in the dilution cylinder 2104 flows into the storage tank 12 through the second inlet pipe 2101 and the third solenoid valve 2102 to reduce the concentration of the absorbent and optimize the treatment effect of the exhaust gas. During the concentration increase and decrease process, the motor 2207 drives the drive gear 2208 to rotate. The rotation of the drive gear 2208 drives the driven gear 2206 and the stirring shaft 2202 connected to it to rotate. The rotation of the stirring shaft 2202 drives the pulley 2204 to rotate. Through the transmission of the synchronous belt 2205, another stirring shaft 2202 can be rotated, thereby causing the stirring paddle 2203 to rotate, which can quickly and evenly mix the absorbent and ensure the effect of exhaust gas treatment.

[0037] All technical features in this embodiment can be freely combined according to actual needs.

[0038] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A waste gas treatment device for replacing sulfuric acid in a titanium dioxide bleaching process, comprising a spray tower (1), characterized in that, An air inlet pipe (2) is fixedly connected to the bottom of the spray tower (1), and a gas concentration sensor (3) is installed on the air inlet pipe (2). An exhaust pipe (4) is fixedly connected to the top of the spray tower (1). Two first ring pipes (5) are provided inside the spray tower (1). The two first ring pipes (5) are fixedly connected to the spray tower (1) by fixing plates (6). The two first ring pipes (5) are fixedly connected to second ring pipes (8) by first connecting pipes (7). The second ring pipes (8) are fixedly connected to a central pipe (10) by second connecting pipes (9). Spray nozzles (11) are evenly distributed on the lower end faces of the first ring pipes (5), the second ring pipes (8) and the central pipe (10). A liquid storage tank (12) is provided on one side of the spray tower (1). The upper end face of the liquid storage tank (12) is fixedly connected to... A delivery pump (13) is connected to the pump (13). The pump (13) is fixedly connected to a suction pipe (14). The bottom end of the suction pipe (14) passes through the storage tank (12) and extends into it. The output end of the suction pipe (14) is fixedly connected to an outlet pipe (15). The top end of the outlet pipe (15) is fixedly connected to a first solenoid valve (16). The top end of the first solenoid valve (16) is fixedly connected to a branch pipe (17). Both ends of the branch pipe (17) pass through the spray tower (1) and are connected to the first ring pipe (5) respectively. A pH sensor (18) and a controller (19) are installed on the storage tank (12). The storage tank (12) is provided with a concentration increasing mechanism (20) and a concentration decreasing mechanism (21). The storage tank (12) is provided with a stirring mechanism (22).

2. The waste gas treatment device for replacing sulfuric acid in the titanium dioxide bleaching process according to claim 1, characterized in that, The concentration increasing mechanism (20) includes a first inlet pipe (2001) fixed to the upper end face of the storage tank (12), a second solenoid valve (2002) fixedly connected to the top end of the first inlet pipe (2001), a first electromagnetic flow meter (2003) fixedly connected to the upper end face of the second solenoid valve (2002), and a concentrate cylinder (2004) fixedly connected to the upper end face of the first electromagnetic flow meter (2003).

3. The waste gas treatment device for replacing sulfuric acid in the titanium dioxide bleaching process according to claim 1, characterized in that, The concentration reduction mechanism (21) includes a second inlet pipe (2101) fixed on the upper end face of the storage tank (12), a third solenoid valve (2102) fixedly connected to the upper end face of the second inlet pipe (2101), a second electromagnetic flow meter (2103) fixedly connected to the upper end face of the third solenoid valve (2102), and a dilution cylinder (2104) fixedly connected to the upper end face of the second electromagnetic flow meter (2103).

4. The waste gas treatment device for replacing sulfuric acid in the titanium dioxide bleaching process according to claim 1, characterized in that, The stirring mechanism (22) includes two bearings (2201) symmetrically fixed on the upper surface of the storage tank (12). A stirring shaft (2202) is fixedly connected to the inner side wall of the inner ring of each of the two bearings (2201). The bottom end of the stirring shaft (2202) passes through the storage tank (12) and extends into its interior. A set of stirring paddles (2203) are evenly fixedly connected to the stirring shaft (2202). A pulley (2204) is fixedly connected to the top end of the stirring shaft (2202). The pulleys (2204) are connected to each other by a synchronous belt (2205). A driven gear (2206) is fixedly connected to the rear stirring shaft (2202). A motor (2207) is fixedly connected to the upper surface of the storage tank (12). A drive gear (2208) that meshes with the driven gear (2206) is fixedly connected to the drive end of the motor (2207).

5. The waste gas treatment device for replacing sulfuric acid in the titanium dioxide bleaching process according to claim 1, characterized in that, The bottom of the spray tower (1) is fixedly connected to a drain pipe (23), and a control valve is installed at the outer end of the drain pipe (23).

6. The waste gas treatment device for replacing sulfuric acid in the titanium dioxide bleaching process according to claim 1, characterized in that, The gas concentration sensor (3), the first solenoid valve (16) and the pH sensor (18) are electrically connected to the controller (19).

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