Tail gas treatment device for desulfurization waste liquid acid production

Abstract

The utility model relates to desulfurization waste liquid equipment technology field of making acid, and disclose a kind of tail gas treatment device of desulfurization waste liquid making acid, including reaction tank, and the pollution discharge pipe is connected in reaction tank bottom, and the tail gas pipe and exhaust pipe are respectively connected in reaction tank two sides, and rotatingly connected with the shaft in reaction tank interior, and first spraying mechanism for being used to the pretreatment of tail gas is sequentially arranged on the shaft from bottom to top, filter screen for being used to the filtration of tail gas, spiral blade for being used to the scraping of reaction tank inner wall dirt and second spraying mechanism for being used to the secondary processing of tail gas, the utility model is by the pretreatment of first spraying mechanism, not only can effectively intercept the large particle contaminant in tail gas, also can preliminarily dissolve part of harmful gas in tail gas, second spraying mechanism further carries out depth processing to tail gas, ensure that harmful substance in tail gas is fully dissolved and removed, improve the efficiency and quality of tail gas treatment.

Description

Technical Field

[0001] This utility model relates to the technical field of desulfurization wastewater acid production equipment, specifically a tail gas treatment device for desulfurization wastewater acid production. Background Technology

[0002] HPF (Hydrogen Fusion Fluorescence) is a liquid-phase catalytic oxidation desulfurization process that uses ammonia as the alkali source and HPF as a composite catalyst. It is a wet liquid-phase catalytic oxidation desulfurization and decyanation process that has been successfully applied in several domestic coking plants. The HPF ammonia desulfurization process utilizes the simultaneous presence of NH3, H2S, and HCN in the raw material. The interaction of these three components in solution, under the action of a catalyst, results in the removal of H2S through wet oxidation desulfurization. The HPF desulfurization catalyst is an aqueous solution composed of three components: H (hydroquinone), PDS (ammonium dicyclophthalic acid hexasulfonate), and F (ferrous sulfate), abbreviated as HPF catalyst.

[0003] The HPF acid production process generates desulfurization wastewater. To reduce pollution and wastewater discharge, using this wastewater to produce acid is a commonly used sulfur recovery method. However, the concentration and drying of sulfur foam during the desulfurization wastewater acid production process generates dry tail gas. After simple treatment, this dry tail gas contains a large amount of dust and acid mist, which can easily cause blockage and corrosion in the exhaust gas pipeline, affecting the normal operation of the exhaust gas system and the service life of the equipment. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a tail gas treatment device for acid production from desulfurization wastewater, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tail gas treatment device for desulfurization wastewater to acid production, comprising a reaction tank, a drain pipe connected to the bottom of the reaction tank, a tail gas pipe and an exhaust pipe connected to both sides of the reaction tank respectively, a rotating shaft rotatably connected inside the reaction tank, the top of the rotating shaft passing through the reaction tank and extending to the top of the reaction tank, a guide cavity opened inside the rotating shaft, and a first spray mechanism for pre-treating the tail gas, a filter screen for filtering the tail gas, a spiral blade for scraping off dirt from the inner wall of the reaction tank, and a second spray mechanism for secondary treatment of the tail gas arranged sequentially from bottom to top on the rotating shaft, the first spray mechanism being fixedly installed at the bottom of the rotating shaft, the filter screen being movably sleeved with the rotating shaft, and the outer wall of the filter screen being fixedly connected to the reaction tank, the spiral blade being fixedly sleeved on the outer wall of the rotating shaft, the second spray mechanism being fixed on the outer wall of the rotating shaft, and both the first spray mechanism and the second spray mechanism being connected to the inside of the guide cavity, and a cleaning mechanism for cleaning the bottom wall of the reaction tank being fixedly connected to the bottom of the first spray mechanism.

[0006] Furthermore, the first spraying mechanism includes a water guide box and a plurality of first nozzles. The water guide box is fixedly connected to the bottom end of the rotating shaft and communicates with the flow guide cavity. The plurality of first nozzles are evenly arranged around the water guide box in a circumferential direction, and all the first nozzles are in communication with the inside of the water guide box. The water guide box is located below the filter screen.

[0007] Furthermore, the second spraying mechanism includes a water distribution box and multiple second nozzles. The water distribution box is fixedly sleeved on the outer wall of the rotating shaft, and the multiple second nozzles are evenly arranged around the water distribution box in a circumferential direction. The water distribution box is located below the exhaust pipe, and the inner wall of the rotating shaft has a water outlet hole that connects the water distribution box and the guide cavity.

[0008] Furthermore, the cleaning mechanism includes two scrapers and two fixing rods. The two scrapers are symmetrically arranged on both sides of the rotating shaft, and the outer walls of the two scrapers abut against the bottom wall of the reaction tank. The two fixing rods are respectively fixedly connected to one side of the top of the two scrapers, and the top of the two fixing rods is fixedly connected to the water guide box. The other side of the top of the two scrapers is slidably connected to the bottom of the filter screen.

[0009] Furthermore, the nozzles of both the first and second nozzles are flat, and there are gaps between the water distribution box, the water guide box and the inner wall of the reaction vessel.

[0010] Furthermore, the outer wall of the spiral blade abuts against the inner wall of the reaction vessel, and the upper and lower ends of the spiral blade are respectively connected to the water distribution box and the water guide box.

[0011] Furthermore, the top of the rotating shaft is connected to a water inlet pipe that communicates with the flow guide cavity, and the water inlet pipe is rotatably and sealed to the rotating shaft.

[0012] Furthermore, a transmission gear is fixedly connected to the outer wall of the rotating shaft, and the transmission gear is located above the reaction vessel.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This utility model effectively removes harmful substances from exhaust gas through dual spraying treatment using a first spraying mechanism and a second spraying mechanism, greatly improving the efficiency and quality of exhaust gas treatment. Simultaneously, the combined use of the filter screen and spiral blades not only further filters impurities from the exhaust gas but also effectively prevents the accumulation of dirt, ensuring the continuity and stability of exhaust gas treatment.

[0014] 2. This utility model, through the pretreatment of the first spray mechanism, can not only effectively intercept large particulate pollutants in the exhaust gas, but also preliminarily dissolve some harmful gases in the exhaust gas. Furthermore, the pretreatment of the first spray mechanism can also cool the exhaust gas, preventing damage to the filter screen due to excessive temperature when the exhaust gas enters the filter screen, thus improving the durability and service life of the exhaust gas treatment device. The second spray mechanism further performs deep treatment on the exhaust gas, ensuring that harmful substances in the exhaust gas are fully dissolved and removed, making the spray treatment more uniform and comprehensive, and improving the efficiency and quality of exhaust gas treatment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a tail gas treatment device for acid production from desulfurization waste liquid according to this utility model. Figure 2 This is a cross-sectional view of the reaction vessel of this utility model; Figure 3 This is a cross-sectional view of the first and second spraying mechanisms of this utility model. Figure 4 This is a partial structural schematic diagram of the second spraying mechanism of this utility model; Figure 5 This is a partial structural diagram of the cleaning mechanism of this utility model.

[0016] In the diagram: 1. Reaction tank; 2. Sewage pipe; 3. Tail gas pipe; 4. Exhaust pipe; 5. Rotating shaft; 6. Flow guide chamber; 7. First spray mechanism; 8. Filter screen; 9. Spiral blades; 10. Second spray mechanism; 11. Cleaning mechanism; 12. Water inlet pipe; 13. Moving gear; 71. Water guide box; 72. First nozzle; 101. Water distribution box; 102. Second nozzle; 103. Water outlet; 111. Scraper; 112. Fixing rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Please see Figures 1 to 5This utility model provides a tail gas treatment device for desulfurization wastewater to acid production, including a reaction tank 1. A drain pipe 2 is connected to the bottom of the reaction tank 1, and tail gas pipes 3 and exhaust pipes 4 are connected to both sides of the reaction tank 1 respectively. A rotating shaft 5 is rotatably connected inside the reaction tank 1, extending from the top of the shaft 5 through the reaction tank 1 to the top of the reaction tank 1. A guide cavity 6 is opened inside the rotating shaft 5. From bottom to top, the rotating shaft 5 is sequentially equipped with a first spray mechanism 7 for pre-treating the tail gas, a filter screen 8 for filtering the tail gas, and a filter for cleaning the inner wall of the reaction tank 1. The scraping spiral blades 9 and the second spray mechanism 10 for secondary treatment of exhaust gas are included. The first spray mechanism 7 is fixedly installed at the bottom of the rotating shaft 5. The filter screen 8 is movably sleeved on the rotating shaft 5, and the outer wall of the filter screen 8 is fixedly connected to the reaction tank 1. The spiral blades 9 are fixedly sleeved on the outer wall of the rotating shaft 5. The second spray mechanism 10 is fixed on the outer wall of the rotating shaft 5. Both the first spray mechanism 7 and the second spray mechanism 10 are connected to the inside of the guide cavity 6. The bottom of the first spray mechanism 7 is also fixedly connected to a cleaning mechanism 11 for cleaning the bottom wall of the reaction tank 1.

[0019] The top of the rotating shaft 5 is connected to a water inlet pipe 12 that communicates with the flow guide cavity 6, and the water inlet pipe 12 is rotatably connected to the rotating shaft 5 in a sealed manner.

[0020] In use, the exhaust gas enters the reaction tank 1 through the exhaust pipe 3. After entering the reaction tank 1, the exhaust gas first undergoes spray treatment by the first spray mechanism 7, effectively removing some harmful substances from the exhaust gas. Subsequently, the exhaust gas passes through the filter screen 8, further filtering out solid particles and impurities. During the upward movement of the exhaust gas, the spiral blades 9 scrape away dirt from the inner wall of the reaction tank 1 as the shaft 5 rotates, preventing dirt accumulation from affecting the exhaust gas treatment effect. Finally, the exhaust gas undergoes a secondary spray treatment by the second spray mechanism 10, ensuring that harmful substances in the exhaust gas are fully removed. At the same time, the cleaning mechanism 11 cleans the bottom wall of the reaction tank 1 at the bottom of the first spray mechanism 7, keeping the inside of the reaction tank 1 clean.

[0021] The design of the guide cavity 6 allows ammonia water to flow from inside the rotating shaft 5 to the first spray mechanism 7 and the second spray mechanism 10, realizing the recycling of ammonia water and improving resource utilization. Ammonia water from the first spray mechanism 7 and the second spray mechanism 10 can be replenished into the guide cavity 6 through the inlet pipe 12, ensuring the continuity and effectiveness of the spray treatment. Furthermore, the filter screen 8 not only effectively filters out solid particles and impurities in the exhaust gas but also prevents the spiral blades 9 from being obstructed by solid particles during rotation, ensuring the stable operation of the spiral blades 9. The scraping action of the spiral blades 9 not only effectively removes dirt from the inner wall of the reaction tank 1 but also guides the filtered exhaust gas, prolonging the gas flow time and increasing the contact area between the exhaust gas and the ammonia water, thereby improving the exhaust gas treatment efficiency.

[0022] This invention utilizes a dual spraying process involving the first spraying mechanism 7 and the second spraying mechanism 10 to effectively remove harmful substances from the exhaust gas, significantly improving the efficiency and quality of exhaust gas treatment. Simultaneously, the combined use of the filter screen 8 and the spiral blades 9 not only further filters impurities from the exhaust gas but also effectively prevents the accumulation of dirt, ensuring the continuity and stability of exhaust gas treatment.

[0023] Specifically, the first spraying mechanism 7 includes a water guide box 71 and multiple first nozzles 72. The water guide box 71 is fixedly connected to the bottom end of the rotating shaft 5 and communicates with the flow guide cavity 6. The multiple first nozzles 72 are evenly arranged around the water guide box 71 in a circumferential direction, and all the first nozzles 72 are in communication with the inside of the water guide box 71. The water guide box 71 is located below the filter screen 8.

[0024] The second spraying mechanism 10 includes a water distribution box 101 and a plurality of second nozzles 102. The water distribution box 101 is fixedly sleeved on the outer wall of the rotating shaft 5. The plurality of second nozzles 102 are evenly arranged around the water distribution box 101 in a circumferential direction. The water distribution box 101 is located below the exhaust pipe 4. The inner wall of the rotating shaft 5 is provided with a water outlet hole 103 that connects the water distribution box 101 and the guide cavity 6.

[0025] When the rotating shaft 5 rotates, the water guide box 71 rotates together with the shaft 5. Since the water guide box 71 is connected to the guide cavity 6, the ammonia water in the guide cavity 6 can enter the water guide box 71 and be evenly sprayed into the exhaust gas through multiple first nozzles 72, performing preliminary spray treatment on the exhaust gas. At the same time, the water distribution box 101 is connected to the guide cavity 6 through the water outlet. As the rotating shaft 5 rotates, the ammonia water in the water distribution box 101 is sprayed onto the exhaust gas again through multiple second nozzles 102. Through the pretreatment of the first spray mechanism 7, not only can large particulate pollutants in the exhaust gas be effectively intercepted, but some harmful gases in the exhaust gas can also be initially dissolved, providing a more efficient spray environment for the subsequent second spray mechanism 10. Furthermore, the pretreatment of the first spray mechanism 7 can also cool the exhaust gas, preventing the exhaust gas from being damaged by excessive temperature when passing through the filter screen 8, thus improving the durability and service life of the exhaust gas treatment device. The second spray mechanism 10 further treats the exhaust gas, ensuring that harmful substances in the exhaust gas are fully dissolved and removed, making the spray treatment more uniform and comprehensive, and improving the efficiency and quality of exhaust gas treatment. The arrangement of multiple first spray nozzles 72 and multiple second spray nozzles 102 ensures that ammonia water evenly covers the exhaust gas, increasing the contact area between the exhaust gas and ammonia water, thereby improving the absorption efficiency of harmful gases in the exhaust gas. This avoids the dead zones that may exist in traditional fixed spraying, thus more effectively removing harmful substances from the exhaust gas and significantly improving the efficiency and quality of exhaust gas treatment.

[0026] The nozzles of the first nozzle 72 and the second nozzle 102 are both flat, and there are gaps between the water distribution box 101, the water guide box 71 and the inner wall of the reaction vessel 1.

[0027] The flat nozzles of the first nozzle 72 and the second nozzle 102 allow the sprayed ammonia water to form a fan shape, thereby covering the gap between the water distribution box 101, the water guide box 71, and the inner wall of the reaction tank 1. This increases the contact area between the ammonia water and the exhaust gas, making the spraying more uniform, improving the efficiency of exhaust gas treatment, further promoting the mixing of exhaust gas and ammonia water, and enhancing the dissolution and absorption of harmful gases. Simultaneously, the gap between the water distribution box 101, the water guide box 71, and the inner wall of the reaction tank 1 allows exhaust gas to pass through. Positioning the first nozzle 72 and the second nozzle 102 around the water guide box 71 and the water distribution box 101, with their horizontal spray direction, avoids direct impact from the rising exhaust gas, prevents clogging of the first nozzle 72 and the second nozzle 102, and ensures the continuity and stability of the spraying process.

[0028] The cleaning mechanism 11 includes two scrapers 111 and two fixing rods 112. The two scrapers 111 are symmetrically arranged on both sides of the rotating shaft 5, and the outer walls of the two scrapers 111 abut against the inner bottom wall of the reaction tank 1. The two fixing rods 112 are respectively fixedly connected to one side of the top of the two scrapers 111, and the top of the two fixing rods 112 is fixedly connected to the water guide box 71. The other side of the top of the two scrapers 111 is slidably connected to the bottom of the filter screen 8.

[0029] When the rotating shaft 5 rotates, it drives the water guide box 71, the water distribution box 101, and the fixing rod 112 fixed to the bottom of the water guide box 71 to rotate as well. This causes the scraper 111, which is fixedly connected to the two fixing rods 112, to rotate. When the two scraper 111 rotate, their outer walls come into close contact with the inner bottom wall of the reaction tank 1, effectively scraping away the deposits attached to the bottom wall and preventing the accumulation of deposits from affecting the exhaust gas treatment effect. At the same time, the two fixing rods 112 not only firmly connect the scraper 111 to the water guide box 71, ensuring the stability of the cleaning mechanism 11, but also allow the scraper 111 to maintain a certain tension and angle during rotation, further improving the cleaning efficiency.

[0030] The outer wall of the spiral blade 9 abuts against the inner wall of the reaction vessel 1, and the upper and lower ends of the spiral blade 9 are connected to the water distribution box 101 and the water guide box 71, respectively.

[0031] The close contact between the spiral blades 9 and the inner wall of the reaction tank 1 not only scrapes away dirt from the inner wall of the reaction tank 1, but also effectively prevents exhaust gas leakage, ensuring the safety of the exhaust gas treatment process. Furthermore, the connection design between the upper and lower ends of the spiral blades 9 and the water distribution box 101 and the water guide box 71 respectively allows for the timely collection and guidance of moisture generated during the exhaust gas treatment process, preventing moisture accumulation in the reaction tank 1 and further improving the efficiency and stability of the exhaust gas treatment.

[0032] A transmission gear 13 is fixedly connected to the outer wall of the rotating shaft 5, and the transmission gear 13 is located above the reaction vessel 1.

[0033] The transmission gear 13 is engaged with an external power device, such as the existing drive motor and gear linkage method, or any existing structure and equipment capable of driving the transmission gear 13 to rotate. The power device drives the transmission gear 13 to rotate, which in turn drives the rotating shaft 5 to rotate. The rotation of the rotating shaft 5 can drive the stirring blades to stir the desulfurization waste liquid in the reaction tank 1, improve the mixing uniformity of the desulfurization waste liquid and oxidant, and accelerate the chemical reaction process. This makes the stirring process more efficient and stable, which helps to improve the acid production efficiency and the tail gas treatment effect.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tail gas treatment device for desulfurization wastewater to acid production, comprising a reaction tank (1), wherein a drain pipe (2) is connected to the bottom of the reaction tank (1), and a tail gas pipe (3) and an exhaust pipe (4) are respectively connected to both sides of the reaction tank (1), characterized in that, The reaction vessel (1) is rotatably connected to a rotating shaft (5). The top of the rotating shaft (5) passes through the reaction vessel (1) and extends to the top of the reaction vessel (1). A guide cavity (6) is opened inside the rotating shaft (5). From bottom to top, the rotating shaft (5) is provided with a first spray mechanism (7) for pre-treating the exhaust gas, a filter screen (8) for filtering the exhaust gas, a spiral blade (9) for scraping the dirt on the inner wall of the reaction vessel (1), and a second spray mechanism (10) for secondary treatment of the exhaust gas. The first spray mechanism ( 7) The filter screen (8) is fixedly installed at the bottom of the rotating shaft (5), and the filter screen (8) is movably sleeved on the rotating shaft (5). The outer wall of the filter screen (8) is fixedly connected to the reaction tank (1). The spiral blade (9) is fixedly sleeved on the outer wall of the rotating shaft (5). The second spray mechanism (10) is fixed on the outer wall of the rotating shaft (5). The first spray mechanism (7) and the second spray mechanism (10) are both connected to the inside of the guide cavity (6). The bottom of the first spray mechanism (7) is also fixedly connected to a cleaning mechanism (11) for cleaning the bottom wall of the reaction tank (1).

2. The tail gas treatment device for desulfurization wastewater to acid production according to claim 1, characterized in that, The first spraying mechanism (7) includes a water guide box (71) and a plurality of first nozzles (72). The water guide box (71) is fixedly connected to the bottom end of the rotating shaft (5) and communicates with the flow guide cavity (6). The plurality of first nozzles (72) are evenly arranged around the water guide box (71) in the circumferential direction, and all the first nozzles (72) are in communication with the inside of the water guide box (71). The water guide box (71) is located below the filter screen (8).

3. The tail gas treatment device for desulfurization wastewater to acid production according to claim 2, characterized in that, The second spraying mechanism (10) includes a water distribution box (101) and a plurality of second nozzles (102). The water distribution box (101) is fixedly sleeved on the outer wall of the rotating shaft (5). The plurality of second nozzles (102) are evenly arranged around the water distribution box (101) in the circumferential direction. The water distribution box (101) is located below the exhaust pipe (4). The inner wall of the rotating shaft (5) is provided with a water outlet hole (103) that connects the water distribution box (101) and the guide cavity (6).

4. The tail gas treatment device for desulfurization wastewater to acid production according to claim 2, characterized in that, The cleaning mechanism (11) includes two scrapers (111) and two fixing rods (112). The two scrapers (111) are symmetrically arranged on both sides of the rotating shaft (5), and the outer walls of the two scrapers (111) abut against the inner bottom wall of the reaction tank (1). The two fixing rods (112) are respectively fixedly connected to one side of the top of the two scrapers (111), and the top of the two fixing rods (112) is fixedly connected to the water guide box (71). The other side of the top of the two scrapers (111) is slidably connected to the bottom of the filter screen (8).

5. The tail gas treatment device for desulfurization wastewater to acid production according to claim 3, characterized in that, The nozzles of the first nozzle (72) and the second nozzle (102) are both flat, and there are gaps between the water distribution box (101), the water guide box (71) and the inner wall of the reaction tank (1).

6. The tail gas treatment device for desulfurization wastewater to acid production according to claim 3, characterized in that, The outer wall of the spiral blade (9) abuts against the inner wall of the reaction vessel (1), and the upper and lower ends of the spiral blade (9) are connected to the water distribution box (101) and the water guide box (71) respectively.

7. The tail gas treatment device for desulfurization wastewater to acid production according to claim 1, characterized in that, The top of the rotating shaft (5) is connected to a water inlet pipe (12) that communicates with the flow guide cavity (6), and the water inlet pipe (12) is sealed and rotatably connected to the rotating shaft (5).

8. The tail gas treatment device for desulfurization wastewater to acid production according to claim 1, characterized in that, The outer wall of the rotating shaft (5) is fixedly connected to a transmission gear (13), and the transmission gear (13) is located above the reaction vessel (1).

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