Drying equipment for sulfur acid production

Abstract

The invention provides drying equipment for sulfur acid production, and belongs to the technical field of gas drying, the drying equipment comprises a drying tower body, a stirring assembly and a gas inlet distribution disc are arranged at the bottom of a gas inlet drying chamber, a gas exhaust hole in the bottom of the gas inlet distribution disc faces the stirring assembly, a spraying assembly is arranged in a spraying drying chamber, and the spraying assembly is communicated with the stirring assembly. An air inlet pipeline, an overflow drainage pipeline and an emptying pipeline are arranged on the lower portion of the side wall of the drying tower body, the air inlet pipeline extends to the air inlet drying cavity and communicates with the air inlet distribution disc, the overflow drainage pipeline is connected to the middle of the air inlet drying cavity, and the emptying pipeline is connected to the bottom of the air inlet drying cavity; an acid inlet pipeline is arranged in the middle of the side wall of the drying tower body. According to the drying equipment for sulfur-to-acid production, the drying degree of air dried for three times can meet the use requirement of a subsequent sulfur burning furnace, the problem that the air drying effect of a sulfuric acid drying tower is poor is solved, and the production efficiency of sulfuric acid preparation is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gas drying, and more specifically, relates to a drying device used in sulfuric acid production. Background Art

[0002] In the sulfur acid production process, sulfur powder is blown into the sulfur incinerator, and dry gas is introduced into the sulfur incinerator at the same time. The sulfur powder melts into liquid sulfur. The dry gas introduced into the sulfur incinerator needs to be dried in advance in a sulfuric acid drying tower.

[0003] In the prior art, concentrated sulfuric acid is connected to the top of a drying tower through a pipeline, and the concentrated sulfuric acid is sprayed downward in the inner cavity of the drying tower from top to bottom. External air is connected to the bottom of the drying tower through a pipeline, and the air passes through the inner cavity of the drying tower from bottom to top. The concentrated sulfuric acid contacts the air and absorbs the mixed moisture, and finally the air is dried to meet the needs of subsequent use. However, in the actual production process, after the air passes through the drying tower once, its dryness often cannot meet the use requirements of the sulfur incinerator. The effect of drying the air in the sulfuric acid tower is not good, and the air often needs to pass through the drying tower multiple times, which will affect the rhythm of continuous production and reduce the production efficiency of sulfuric acid preparation. Summary of the invention

[0004] The object of the present invention is to provide a drying device for sulfuric acid production, aiming to solve the problem that the sulfuric acid drying tower has poor air drying effect, resulting in reduced production efficiency of sulfuric acid preparation.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a drying device for sulfuric acid production, including a drying tower body, the inner cavity of the drying tower body is respectively provided with a packing assembly and a demisting assembly from bottom to top, the packing assembly and the demisting assembly respectively divide the inner cavity of the drying tower body from bottom to top into an air intake drying chamber, a spray drying chamber and an exhaust filter chamber, the bottom of the air intake drying chamber is provided with a stirring assembly and an air intake distribution plate from bottom to top, the exhaust hole at the bottom of the air intake distribution plate faces the stirring assembly, the spray drying chamber is provided with a spray assembly, the exhaust filter chamber is provided with a filter A wire mesh layer is provided, an air inlet pipe, an overflow drainage pipe and an emptying pipe are arranged at the lower part of the side wall of the drying tower body, the air inlet pipe extends to the air inlet drying chamber and is connected to the air inlet distribution plate, the overflow drainage pipe is connected to the middle part of the air inlet drying chamber and the overflow drainage pipe is located above the exhaust hole of the air inlet distribution plate, the emptying pipe is connected to the bottom of the air inlet drying chamber, an acid inlet pipe is arranged at the middle part of the side wall of the drying tower body, the acid inlet pipe extends to the spray drying chamber and is connected to the spray assembly, an exhaust pipe is arranged at the top of the drying tower body, and the exhaust pipe is connected to the exhaust filter chamber.

[0006] In one possible implementation, the packing assembly includes an upper filter plate, a lower filter plate and a middle packing, the upper filter plate is arranged on the top of the middle packing, the lower filter plate is arranged on the bottom of the middle packing, the upper filter plate and the lower filter plate both have a plurality of evenly distributed filter holes, and the middle packing is a composite packing mixed with fiber packing and ceramic packing.

[0007] In one possible implementation, the defogger assembly includes a blocking baffle and a plurality of defogger sleeves, wherein the blocking baffle is horizontally installed at the upper part of the inner cavity of the drying tower body, and a plurality of mounting holes corresponding to the plurality of defogger sleeves are opened on the blocking baffle, and the defogger sleeve has a connecting port only at the upper end, and the outer periphery and the bottom of the defogger sleeve have a defogger layer with gas passage holes only.

[0008] In a possible implementation, the inner cavity cross-sectional area of ​​the air intake distribution plate decreases from top to bottom, the top of the air intake distribution plate is connected to the air intake pipe, the bottom of the air intake distribution plate has an exhaust surface, and a plurality of exhaust holes are evenly arranged on the exhaust surface and the exhaust direction of the plurality of exhaust holes is toward the stirring assembly.

[0009] In a possible implementation, the stirring assembly includes a driving motor, a rotating shaft and a stirring mesh plate, the driving motor is installed at the bottom of the drying tower body, the rotating shaft is longitudinally arranged at the bottom of the air intake drying chamber and is connected to the driving end of the driving motor, the stirring mesh plate is vertically arranged on the rotating shaft, a cutting gap for preliminary cutting of bubbles is formed between the stirring mesh plate and the exhaust surface, a plurality of cutting mesh holes for secondary cutting of bubbles are evenly opened on the stirring mesh plate, a plurality of spoiler rods are arranged at intervals along the length direction at the upper end of the stirring mesh plate, the plurality of spoiler rods and the stirring mesh plate are all inclined and have the same inclination angle, and the inclination angle of the spoiler rod is set at an angle to the rotation direction of the rotating shaft.

[0010] In a possible implementation, the exhaust surface is an upwardly protruding spherical surface, the upper end of the stirring mesh plate forms an arc surface adapted to the spherical surface, the spherical surface and the arc surface form the cutting gap, and a plurality of spoiler rods are sequentially arranged on the arc surface along the length direction.

[0011] In a possible implementation, the spray assembly includes a liquid inlet end and a spray sleeve, the liquid inlet end is integrally formed at the end of the acid inlet pipe, a baffle is circumferentially arranged at the end of the liquid inlet end, the upper part of the spray sleeve is sleeved on the liquid inlet end, a ring plate is arranged on the top of the spray sleeve, the ring plate is sleeved on the acid inlet pipe, an elastic member is arranged between the baffle and the ring plate, a plurality of nozzles are arranged on the middle and lower parts of the outer wall of the spray sleeve, a pulse valve is arranged on the acid inlet pipe, the pulse valve is located outside the drying tower body, the pulse valve provides sulfuric acid in a pulse spray state to the spray sleeve through the liquid inlet end, the spray sleeve moves up and down under the action of the elastic member and sprays sulfuric acid with the help of the plurality of nozzles at the same time.

[0012] In a possible implementation, the multiple nozzles located in the middle of the outer wall of the spray sleeve are defined as upper nozzles, and the multiple nozzles located in the lower part of the outer wall of the spray sleeve are defined as lower nozzles, the upper nozzles are arranged to be inclined upward, the bottom of the spray sleeve has a spherical shell, the lower nozzles are vertically arranged on the spherical shell, and the axial angle between the upper nozzle and the lower nozzle is between 45° and 90°.

[0013] In a possible implementation, the nozzle includes an injection tube and a sputtering sleeve, the end of the injection tube is closed and a plurality of injection holes are opened on the circumferential outer wall near the end, the sputtering sleeve is arranged at the end of the injection tube and surrounds the plurality of injection holes inside, the inner circumferential wall of the sputtering sleeve forms a conical sputtering surface of a flared structure, the path of the sulfuric acid liquid sprayed from the injection tube is defined as an original path, the path of the sulfuric acid liquid after sputtering by the conical sputtering surface is defined as a sputtering path, and the angle between the original path and the sputtering path is greater than 90°.

[0014] In a possible implementation, both the overflow drainage pipe and the drain pipe are provided with opening and closing valves.

[0015] The beneficial effect of a drying device for sulfuric acid production provided by the present invention is that: compared with the prior art, the filling assembly and the demisting assembly of the inner cavity of the drying tower body respectively divide the inner cavity of the drying tower body from bottom to top into an air intake drying chamber, a spray drying chamber and an exhaust filter chamber, and the sulfuric acid liquid enters the spray assembly through the acid inlet pipe, and the spray assembly sprays the sulfuric acid liquid in the spray drying chamber, and after passing through the filling assembly, it is collected at the bottom of the air intake drying chamber. When the liquid level of the sulfuric acid liquid reaches the height of the overflow drainage pipe, it is discharged through the overflow drainage pipe. External air enters the air intake distribution plate through the air intake pipe, and then is discharged into the sulfuric acid liquid collected at the bottom of the air intake drying chamber through the exhaust hole of the air intake distribution plate. The stirring assembly stirs the sulfuric acid liquid so that the air is fully in contact with the sulfuric acid liquid, and the air completes the initial drying. After that, the air passes upward through the filling assembly, and then contacts the sulfuric acid liquid in the filling assembly for a second time to complete the secondary drying. Finally, the air contacts the sprayed sulfuric acid liquid again upward to complete the third drying. After the above drying, the air passes through the demisting component and the filter screen layer, and is finally discharged from the exhaust pipe for use in the subsequent process. The dryness of the air after three dryings can meet the use requirements of the subsequent sulfur incinerator, solving the problem of poor air drying effect of the sulfuric acid drying tower and improving the production efficiency of sulfuric acid preparation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a drying device for sulfuric acid production provided by the present invention; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 A side structural diagram of the rotating shaft, stirring mesh plate and spoiler rod provided by the present invention; Figure 4 A top view of the structure of the stirring mesh plate and the spoiler rod provided by the present invention; Figure 5 A schematic diagram of the structure of the spray assembly provided by the present invention; Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0018] In the figure: 1. Drying tower body; 2. Filling assembly; 210. Upper filter plate; 220. Lower filter plate; 230. Middle filler; 3. Demisting assembly; 310. Blocking baffle; 320. Demisting sleeve; 4. Inlet drying chamber; 5. Spray drying chamber; 6. Exhaust filter chamber; 7. Stirring assembly; 710. Drive motor; 720. Rotating shaft; 730. Stirring mesh plate; 740. Spoiler rod; 8. Inlet distribution plate; 810. Exhaust hole; 9. Spraying assembly; 10. Filter mesh layer; 11. Air inlet pipe; 12. Overflow drainage pipe; 13. Emptying pipe; 14. Acid inlet pipe; 1410. Pulse valve; 15. Exhaust pipe; 16. Liquid inlet end; 17. Spray sleeve; 18. Baffle; 19. Ring plate; 20. Elastic part; 21. Nozzle; 2110. Injection pipe; 2120. Injection hole; 2130. Sputtering sleeve; 2140. Conical sputtering surface; 2150. Original path; 2160. Sputtering path; 22. Opening and closing valve. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Unless explicitly defined otherwise, the use of terms such as "first," "second," or "third," etc., are intended to distinguish different objects rather than to describe a specific order.

[0021] Unless otherwise expressly defined, directional words such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", "high", "low", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, so they cannot be understood as limiting the specific scope of protection of the present invention.

[0022] See also Figures 1 to 6, a drying device for sulfuric acid production provided by the present invention is now described. A drying device for sulfuric acid production includes a drying tower body 1, the inner cavity of the drying tower body 1 is provided with a packing assembly 2 and a demisting assembly 3 from bottom to top, the packing assembly 2 and the demisting assembly 3 respectively divide the inner cavity of the drying tower body 1 from bottom to top into an air intake drying chamber 4, a spray drying chamber 5 and an exhaust filter chamber 6, the bottom of the air intake drying chamber 4 is provided with a stirring assembly 7 and an air intake distribution plate 8 from bottom to top, the exhaust hole 810 at the bottom of the air intake distribution plate 8 faces the stirring assembly 7, the spray drying chamber 5 is provided with a spray assembly 9, the exhaust filter chamber 6 is provided with a filter mesh layer 10, the drying tower body 1 An air intake pipe 11, an overflow drainage pipe 12 and an emptying pipe 13 are arranged at the lower part of the side wall. The air intake pipe 11 extends to the air intake drying chamber 4 and is connected to the air intake distribution plate 8. The overflow drainage pipe 12 is connected to the middle part of the air intake drying chamber 4 and the overflow drainage pipe 12 is located above the exhaust hole 810 of the air intake distribution plate 8. The emptying pipe 13 is connected to the bottom of the air intake drying chamber 4. An acid inlet pipe 14 is arranged in the middle part of the side wall of the drying tower body 1. The acid inlet pipe 14 extends to the spray drying chamber 5 and is connected to the spray assembly 9. An exhaust pipe 15 is arranged on the top of the drying tower body 1, and the exhaust pipe 15 is connected to the exhaust filter chamber 6.

[0023] The present invention provides a drying device for sulfuric acid production. Compared with the prior art, the packing assembly 2 and the demisting assembly 3 of the inner cavity of the drying tower body 1 respectively divide the inner cavity of the drying tower body 1 from bottom to top into an air intake drying chamber 4, a spray drying chamber 5 and an exhaust filter chamber 6. The sulfuric acid liquid enters the spray assembly 9 through the acid inlet pipe 14. The spray assembly 9 sprays the sulfuric acid liquid in the spray drying chamber 5. After passing through the packing assembly 2, the sulfuric acid liquid is collected at the bottom of the air intake drying chamber 4. When the liquid level of the sulfuric acid liquid reaches the height of the overflow drainage pipe 12, it is discharged through the overflow drainage pipe 12. External air enters the air intake distribution plate 8 through the air intake pipe 11, and then is discharged into the sulfuric acid liquid collected at the bottom of the air intake drying chamber 4 through the exhaust hole 810 of the air intake distribution plate 8. The stirring assembly 7 stirs the sulfuric acid liquid so that the air is fully in contact with the sulfuric acid liquid, and the air completes the initial drying. After that, the air passes upward through the packing assembly 2, and then contacts the sulfuric acid liquid in the packing assembly 2 for a second time to complete the secondary drying. Finally, the air moves upward and contacts the sprayed sulfuric acid liquid again, completing the third drying. After the above drying, the air passes through the demisting component 3 and the filter screen layer 10, and is finally discharged from the exhaust pipe 15 for use in the subsequent process. The dryness of the air after the third drying can meet the use requirements of the subsequent sulfur incinerator, solves the problem of poor air drying effect of the sulfuric acid drying tower, and improves the production efficiency of sulfuric acid preparation.

[0024] See also Figure 1The packing assembly 2 includes an upper filter plate 210, a lower filter plate 220 and a middle packing 230. The upper filter plate 210 is arranged on the top of the middle packing 230, and the lower filter plate 220 is arranged on the bottom of the middle packing 230. The upper filter plate 210 and the lower filter plate 220 are both provided with a plurality of evenly distributed filter holes. The upper filter plate 210 and the lower filter plate 220 can support the middle packing 230. At the same time, the filter holes can be used to filter air and sulfuric acid liquid. In addition, the middle packing 230 is a composite packing mixed with fiber packing and ceramic packing. The fiber packing is selected from polypropylene (PP), polyethylene (PE), polytetrafluoroethylene (PTFE), etc., and the ceramic packing is selected from alumina (Al2O3), diatomaceous earth (SiO2), zeolite, etc. The mixing ratio of the fiber packing and the ceramic packing is 1:3-5. The fiber packing can increase the fluffiness of the composite packing and increase the specific surface area of ​​the sulfuric acid liquid in contact with the air. The ceramic packing forms a skeleton structure and has better acid resistance.

[0025] See also Figure 1 The demisting assembly 3 includes a blocking baffle 310 and a plurality of demisting sleeves 320. The blocking baffle 310 is horizontally installed at the upper part of the inner cavity of the drying tower body 1. The blocking baffle 310 is provided with a plurality of mounting holes corresponding to the plurality of demisting sleeves 320. The demisting sleeve 320 has only a connection port at the upper end. The periphery and the bottom of the demisting sleeve 320 are provided with a demisting layer only for gas through holes. The demisting layer constitutes the main structure of the demisting sleeve 320. The demisting layer adopts a wire mesh, a filler, a fiber layer or a metal mesh. The demisting layer can further capture sulfuric acid droplets mixed in the air. After the sulfuric acid liquid sprayed by the spray assembly 9 is mixed in the air, the demisting layer can remove the sulfuric acid droplets mixed in the gas, purify the air finally discharged, and ensure the dryness of the air.

[0026] See also Figures 1 to 4 The cross-sectional area of ​​the inner cavity of the air inlet distribution plate 8 decreases from top to bottom. The top of the air inlet distribution plate 8 is connected to the air inlet pipe 11. The bottom of the air inlet distribution plate 8 is provided with an exhaust surface. A plurality of exhaust holes 810 are evenly arranged on the exhaust surface and the exhaust direction of the plurality of exhaust holes 810 is toward the stirring assembly 7. The air entering the air inlet distribution plate 8 through the air inlet pipe 11 is discharged from the plurality of exhaust holes 810 on the exhaust surface into the sulfuric acid liquid collected at the bottom of the air inlet drying chamber 4. The stirring assembly 7 stirs the sulfuric acid liquid so that the air entering from the outside is fully in contact with the sulfuric acid liquid to complete the drying of the air.

[0027] The stirring assembly 7 includes a driving motor 710, a rotating shaft 720, and a stirring mesh plate 730. The driving motor 710 is installed at the bottom of the drying tower body 1, the rotating shaft 720 is longitudinally arranged at the bottom of the air inlet drying chamber 4 and connected to the driving end of the driving motor 710, and the stirring mesh plate 730 is vertically arranged on the rotating shaft 720. The driving end of the driving motor 710 drives the rotating shaft 720 to rotate, thereby driving the rotation of the stirring mesh plate 730, and the stirring mesh plate 730 stirs the sulfuric acid liquid, so that the gas and liquid can fully contact, thereby improving the drying effect.

[0028] First, a cutting gap for preliminary cutting of bubbles is formed between the stirring mesh plate 730 and the exhaust surface. As the stirring mesh plate 730 rotates, the air discharged from the exhaust hole 810 passes through the cutting gap and is cut by the rotating stirring mesh plate 730, thereby preventing the air from forming larger bubbles in the sulfuric acid liquid and reducing the contact area between the air and the sulfuric acid liquid.

[0029] Secondly, a plurality of cutting meshes for secondary cutting of bubbles are evenly arranged on the stirring mesh plate 730. The air passing through the cutting gap forms more bubbles, and these bubbles are secondary cut by the plurality of cutting meshes to form smaller bubbles, thereby further increasing the contact area between the air and the sulfuric acid liquid.

[0030] Finally, the upper end of the stirring mesh plate 730 is provided with a plurality of spoiler rods 740 at intervals along the length direction, and the spoiler rods 740 are located in the cutting gap. When the air passes through the cutting gap, the plurality of spoiler rods 740 stir the sulfuric acid liquid and the air, and can break up the larger bubbles. In addition, the plurality of spoiler rods 740 and the stirring mesh plate 730 are all tilted and arranged at the same inclination angle, and the inclination angle of the spoiler rods 740 is arranged at an angle with the rotation direction of the rotating shaft 720. When the spoiler rods 740 rotate with the stirring mesh plate 730, they can form a greater resistance, can enhance the spoiler effect of the sulfuric acid liquid, break the larger bubbles into smaller bubbles, increase the contact area between the air and the sulfuric acid liquid, and ensure the drying effect of the air.

[0031] Preferably, the exhaust surface is a spherical surface convex upward, and the upper end of the stirring mesh plate 730 forms an arcuate surface adapted to the spherical surface, and the spherical surface and the arcuate surface form a cutting gap, and a plurality of spoiler rods 740 are sequentially arranged on the arcuate surface along the length direction. The effective area of ​​the exhaust surface that the spherical surface structure can increase, more exhaust holes 810 can be arranged on the exhaust surface, and under the gas of the same exhaust volume, the exhaust holes 810 are more in number, and their apertures are smaller, and the bubbles generated are also better, which can improve the contact area between air and sulfuric acid liquid. At the same time, the air discharged from the exhaust holes 810 on the exhaust surface of the spherical surface structure is not easy to be discharged directly from the edge of the exhaust surface, but needs to be fully stirred and mixed by the stirring mesh plate 730, and then thrown out of the edge of the exhaust surface, which can improve the contact time between air and sulfuric acid liquid, and air can be fully in contact with sulfuric acid liquid.

[0032] See also Figure 5 The spray assembly 9 includes a liquid inlet end 16 and a spray sleeve 17. The liquid inlet end 16 is integrally formed at the end of the acid inlet pipe 14. A baffle 18 is circumferentially arranged at the end of the liquid inlet end 16. The upper part of the spray sleeve 17 is sleeved on the liquid inlet end 16. The top of the spray sleeve 17 is provided with an annular plate 19, and the annular plate 19 is sleeved on the acid inlet pipe 14. The outer peripheral wall of the baffle 18 is sealed and matched with the inner peripheral wall of the spray sleeve 17 and can slide axially. The inner peripheral wall of the annular plate 19 is sealed and matched with the outer peripheral wall of the liquid inlet end 16 and can slide axially.

[0033] An elastic member 20 is provided between the baffle 18 and the annular plate 19. The elastic member 20 is a spring. The spring sleeve is provided outside the acid inlet pipe 14 and inside the spray sleeve 17. The spring is in a free state when not subjected to external force. Multiple nozzles 21 are provided at the middle and lower parts of the outer wall of the spray sleeve 17. A pulse valve 1410 is provided on the acid inlet pipe 14. The pulse valve 1410 is located outside the drying tower body 1. The pulse valve 1410 provides sulfuric acid liquid in a pulse spray state to the spray sleeve 17 through the liquid inlet terminal 16. The spray sleeve 17 moves up and down under the action of the elastic member 20 and sprays sulfuric acid with the help of multiple nozzles 21 at the same time.

[0034] Under the action of the pulse valve 1410, the sulfuric acid liquid is intermittently sprayed into the spray sleeve 17 in a pulse spraying state. When the sulfuric acid liquid is just sprayed into the spray sleeve 17, its impact force will drive the spray sleeve 17 to move downward along the axial direction of the liquid inlet end 16 and compress the spring, and the effective space in the spray sleeve 17 gradually increases. The sulfuric acid liquid sprayed into the spray sleeve 17 is sprayed into the spray drying chamber 5 through multiple nozzles 21. Afterwards, the impact force of the sulfuric acid liquid disappears, and the spring in the compressed state is reset, thereby driving the spray sleeve 17 to move upward and reset. In this process, the effective space inside the spray sleeve 17 gradually shrinks, forming pressure on the sulfuric acid liquid. In addition, due to the residual impact force of the sulfuric acid liquid, the sulfuric acid liquid will continue to spray outward as the spray sleeve 17 is reset. Finally, in one pulse stroke, the spray assembly 9 located in the spray drying chamber 5 will reciprocate in the height direction while spraying the sulfuric acid liquid in the circumferential direction, thereby forming multiple contacts with the air in the height direction, increasing the contact area between the air and the sulfuric acid liquid, and repeating the above-mentioned pulse spraying state can greatly improve the drying effect of the sulfuric acid liquid on the air.

[0035] Specifically, the plurality of nozzles 21 located in the middle of the outer wall of the spray sleeve 17 are defined as the upper nozzles 21, and the plurality of nozzles 21 located in the lower part of the outer wall of the spray sleeve 17 are defined as the lower nozzles 21. The upper nozzles 21 are arranged to tilt upward, and the bottom of the spray sleeve 17 is provided with a spherical shell. The lower nozzles 21 are arranged vertically on the spherical shell, and the axial angle between the upper nozzles 21 and the lower nozzles 21 is between 45° and 90°. The upper nozzles 21 and the lower nozzles 21 can effectively cover the periphery and bottom areas of the spray sleeve 17, so that the volume of the spray sleeve 17 does not need to be made very large, which can not only reduce the manufacturing cost, but also make the mass of the spray assembly 9 lighter, and facilitate the installation and maintenance of the spray assembly 9 in the spray drying chamber 5.

[0036] See also Figure 6 The nozzle 21 includes a spray pipe 2110 and a sputtering sleeve 2130. The end of the spray pipe 2110 is closed and a plurality of spray holes 2120 are provided on the circumferential outer wall near the end. The sputtering sleeve 2130 is arranged at the end of the spray pipe 2110 and surrounds the plurality of spray holes 2120 inside. The inner circumferential wall of the sputtering sleeve 2130 forms a conical sputtering surface 2140 with an expanded structure. The path of the sulfuric acid liquid sprayed from the spray pipe 2110 is defined as an original path 2150, and the path of the sulfuric acid liquid after sputtering by the conical sputtering surface 2140 is defined as a sputtering path 2160. The sulfuric acid liquid sprayed from the plurality of spray holes 2120 is sprayed into the spray drying chamber 5 after being reflected by the conical sputtering surface 2140. The angle between the original path 2150 of the initial spray of the sulfuric acid liquid and the sputtering path 2160 after passing through the conical sputtering surface 2140 is greater than 90°, which can have a wider spray angle range and can effectively cover the space around and at the bottom of the spray assembly 9. In addition, after the high-speed sprayed sulfuric acid liquid hits the conical sputtering surface 2140, the sulfuric acid liquid will form smaller or mist-like droplets, increasing the contact area between the air and the sulfuric acid liquid and improving the drying effect of the air.

[0037] In addition, both the overflow drainage pipe 12 and the emptying pipe 13 are provided with an opening and closing valve 22. First, the opening and closing valve 22 on the overflow drainage pipe 12 is opened, and sulfuric acid liquid is introduced through the acid inlet pipe 14. When sulfuric acid liquid begins to be discharged from the overflow drainage pipe 12, external air is introduced through the air inlet pipe 11, and the external air can complete preliminary drying with the sulfuric acid liquid collected at the bottom of the air inlet drying chamber 4. When all the external air is dried, sulfuric acid liquid is no longer introduced through the acid inlet pipe 14, and the opening and closing valve 22 on the overflow drainage pipe 12 is closed. The opening and closing valve 22 on the emptying pipe 13 can be selectively opened or not opened. If the air needs to be dried continuously for a short time, the opening and closing valve 22 on the emptying pipe 13 does not need to be opened. When air drying is performed again, sufficient sulfuric acid liquid will be collected at the bottom of the air inlet drying chamber 4, and sulfuric acid liquid and external air can be introduced at the same time. If the next air drying operation interval is long, the on-off valve 22 on the exhaust pipe 13 can be opened to completely exhaust the sulfuric acid liquid collected at the bottom of the air intake drying chamber 4.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A drying device for sulfuric acid production, characterized in that: The invention comprises a drying tower body (1), wherein the inner cavity of the drying tower body (1) is provided with a packing assembly (2) and a demisting assembly (3) at intervals from bottom to top, respectively; the packing assembly (2) and the demisting assembly (3) respectively divide the inner cavity of the drying tower body (1) from bottom to top into an air intake drying chamber (4), a spray drying chamber (5) and an exhaust filter chamber (6); the bottom of the air intake drying chamber (4) is provided with a stirring assembly (7) and an air intake distribution plate (8) from bottom to top, the exhaust hole (810) at the bottom of the air intake distribution plate (8) faces the stirring assembly (7); the spray drying chamber (5) is provided with a spray assembly (9); the exhaust filter chamber (6) is provided with a filter mesh layer (10); the lower part of the side wall of the drying tower body (1) is provided with an air intake duct (11 ), an overflow drainage pipe (12) and an emptying pipe (13), the air intake pipe (11) extends to the air intake drying chamber (4) and is connected to the air intake distribution plate (8), the overflow drainage pipe (12) is connected to the middle of the air intake drying chamber (4) and the overflow drainage pipe (12) is located above the exhaust hole (810) of the air intake distribution plate (8), the emptying pipe (13) is connected to the bottom of the air intake drying chamber (4), an acid inlet pipe (14) is arranged in the middle of the side wall of the drying tower body (1), the acid inlet pipe (14) extends to the spray drying chamber (5) and is connected to the spray assembly (9), and an exhaust pipe (15) is arranged on the top of the drying tower body (1), and the exhaust pipe (15) is connected to the exhaust filter chamber (6).

2. A drying device for sulfuric acid production according to claim 1, characterized in that: The filler assembly (2) comprises an upper filter plate (210), a lower filter plate (220) and a middle filler (230); the upper filter plate (210) is arranged on the top of the middle filler (230); the lower filter plate (220) is arranged on the bottom of the middle filler (230); the upper filter plate (210) and the lower filter plate (220) both have a plurality of evenly distributed filter holes; and the middle filler (230) is a composite filler mixed with a fiber filler and a ceramic filler.

3. The drying equipment for sulfuric acid production according to claim 1, characterized in that: The demisting assembly (3) comprises a blocking baffle (310) and a plurality of demisting sleeves (320); the blocking baffle (310) is horizontally mounted on the upper part of the inner cavity of the drying tower body (1); a plurality of mounting holes corresponding to the plurality of demisting sleeves (320) are opened on the blocking baffle (310); the demisting sleeve (320) has only a connection port at the upper end; the outer periphery and the bottom of the demisting sleeve (320) are both provided with a demisting layer with only gas through holes.

4. The drying equipment for sulfuric acid production according to claim 1, characterized in that: The cross-sectional area of ​​the inner cavity of the air intake distribution plate (8) decreases from top to bottom, the top of the air intake distribution plate (8) is connected to the air intake pipe (11), and the bottom of the air intake distribution plate (8) is provided with an exhaust surface, and a plurality of exhaust holes (810) are evenly arranged on the exhaust surface and the exhaust direction of the plurality of exhaust holes (810) is toward the stirring assembly (7).

5. A drying device for sulfuric acid production according to claim 4, characterized in that: The stirring assembly (7) comprises a driving motor (710), a rotating shaft (720) and a stirring mesh plate (730), wherein the driving motor (710) is mounted at the bottom of the drying tower body (1), the rotating shaft (720) is longitudinally arranged at the bottom of the air intake drying chamber (4) and connected to the driving end of the driving motor (710), the stirring mesh plate (730) is vertically arranged on the rotating shaft (720), a cutting gap for preliminary cutting of bubbles is formed between the stirring mesh plate (730) and the exhaust surface, a plurality of cutting mesh holes for secondary cutting of bubbles are evenly arranged on the stirring mesh plate (730), a plurality of spoiler rods (740) are arranged at intervals along the length direction at the upper end of the stirring mesh plate (730), the plurality of spoiler rods (740) and the stirring mesh plate (730) are all arranged obliquely and at the same inclination angle, and the inclination angle of the spoiler rod (740) is arranged at an angle to the rotation direction of the rotating shaft (720).

6. A drying device for sulfuric acid production according to claim 5, characterized in that: The exhaust surface is an upwardly protruding spherical surface, the upper end of the stirring mesh plate (730) forms an arcuate surface adapted to the spherical surface, the spherical surface and the arcuate surface form the cutting gap, and a plurality of spoiler rods (740) are sequentially arranged on the arcuate surface along the length direction.

7. The drying equipment for sulfuric acid production according to claim 1, characterized in that: The spray assembly (9) comprises a liquid inlet end head (16) and a spray sleeve (17); the liquid inlet end head (16) is integrally formed at the end of the acid inlet pipe (14); a baffle (18) is circumferentially arranged at the end of the liquid inlet end head (16); the upper part of the spray sleeve (17) is sleeved on the liquid inlet end head (16); an annular plate (19) is arranged on the top of the spray sleeve (17); the annular plate (19) is sleeved on the acid inlet pipe (14); and a spring is arranged between the baffle (18) and the annular plate (19). The spray sleeve (17) is provided with a plurality of nozzles (21) at the middle and lower parts of the outer wall of the spray sleeve (17), the acid inlet pipeline (14) is provided with a pulse valve (1410), the pulse valve (1410) is located outside the drying tower body (1), the pulse valve (1410) provides sulfuric acid liquid in a pulse spray state to the spray sleeve (17) through the liquid inlet end (16), and the spray sleeve (17) moves up and down under the action of the elastic member (20) and sprays sulfuric acid with the help of the plurality of nozzles (21) at the same time.

8. The drying equipment for sulfuric acid production according to claim 7, characterized in that: The plurality of nozzles (21) located in the middle of the outer wall of the spray sleeve (17) are defined as upper nozzles, and the plurality of nozzles (21) located in the lower part of the outer wall of the spray sleeve (17) are defined as lower nozzles, the upper nozzles are arranged to be inclined upward, the bottom of the spray sleeve (17) is provided with a spherical shell, the lower nozzles are vertically arranged on the spherical shell, and the axial angle between the upper nozzle and the lower nozzle is between 45° and 90°.

9. A drying device for sulfuric acid production according to claim 7 or 8, characterized in that: The nozzle (21) comprises an injection pipe (2110) and a sputtering sleeve (2130); the end of the injection pipe (2110) is closed and a plurality of injection holes (2120) are provided on a circumferential outer wall close to the end; the sputtering sleeve (2130) is arranged at the end of the injection pipe (2110) and surrounds the plurality of injection holes (2120) inside; the inner circumferential wall of the sputtering sleeve (2130) forms a conical sputtering surface (2140) with an expanded structure; the path of the sulfuric acid liquid sprayed from the injection pipe (2110) is defined as an original path (2150); the path of the sulfuric acid liquid after sputtering by the conical sputtering surface (2140) is defined as a sputtering path (2160); and the angle between the original path (2150) and the sputtering path (2160) is greater than 90°.

10. The drying equipment for sulfuric acid production according to claim 1, characterized in that: The overflow drainage pipe (12) and the drain pipe (13) are both provided with opening and closing valves (22).

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