Titanium dioxide calcination tail gas treatment spray tower and tail gas treatment device

Abstract

The utility model discloses a titanium dioxide calcination tail gas treatment spray tower and a tail gas treatment device, relates to the technical field of titanium dioxide production and treatment, and solves the technical problems that in the existing titanium dioxide calcination process, sodium sulfite is generated in the tail gas alkali spraying process, and a large amount of sodium sulfite is discharged along with tail gas, so that the dust content of the tail gas is high. The spraying device comprises a plurality of layers of spraying assemblies which are longitudinally arranged from top to bottom, each layer of spraying assembly comprises a spraying containing cavity and a rotary spraying piece, the spraying containing cavity is of a spiral structure, and the multiple rotary spraying pieces are arranged at the bottom of the spraying containing cavity at intervals in a penetrating mode. The lengths of the rotary spraying pieces located on the same spraying containing cavity are different. The tail gas alkali spraying device has the advantages that sodium sulfite generated in the tail gas alkali spraying process can be fully absorbed, the dust content of tail gas can be fully reduced, meanwhile, spraying liquid can be recycled, spraying liquid loss is reduced, the operation cost is reduced, and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to titanium dioxide production processing technical field, concretely relates to a kind of titanium dioxide calcination tail gas treatment spray tower and tail gas treatment device. BACKGROUND

[0002] Sulfuric acid method, chlorination method are the mainstream technology of current large-scale industrial manufacturing of titanium dioxide. At present, China's sulfuric acid method titanium white production process is still dominant, and in the sulfuric acid method titanium dioxide process, tail gas treatment is the core link of the entire process field. Titanium dioxide can produce a variety of mixed gas after calcination, and many gases are strongly polluting, which will have varying degrees of impact and damage to the air quality and atmospheric environment of the region, and even cause respiratory diseases and other problems of residents in the region. Therefore, titanium dioxide calcination tail gas treatment has become an important stage of titanium dioxide manufacturing process, and urgent technical upgrading and industrial innovation are needed to adjust and improve from the technical, management and operational levels. Influenced by titanium dioxide production process, the application quality of tail gas treatment technology will directly or indirectly affect the quality of titanium dioxide products, which needs to be strengthened and implemented from the production process.

[0003] The main raw material for titanium dioxide production is metatitanic acid. Such substances have high temperature and air humidity during calcination, and objectively there are conditions for the emission of titanium dioxide dust, acid mist, sulfur oxides and other harmful gases. According to the data analysis of a titanium dioxide production workshop, about 20,000 m 3 Waste gas is emitted for every 1t of titanium dioxide produced, and the temperature of waste gas is 200-400℃, which objectively aggravates waste gas pollution and deepens the diffusion degree of waste gas. In addition, the pollution of acid mist, sulfur dioxide and titanium dioxide in waste gas varies greatly under different production technology levels, so it can be seen that the sulfuric acid method titanium dioxide calcination process needs to further improve the technical level and quality of tail gas treatment, and needs to understand and analyze traditional technology to further explore the innovation content of sulfuric acid method titanium dioxide calcination tail gas treatment technology, reduce the temperature and pollution of exhaust gas, and effectively control gas pollution.

[0004] The application advantage of sulfuric acid method is mainly to realize effective smelting of iron ore and sulfuric acid with low production cost, and the production process is relatively mature, and the operation is simple, the production is convenient, the cost is controllable, and the basic needs of intermittent production can be met. However, the biggest problem of the process is that the calcination tail gas has a serious pollution problem, especially the products such as sulfuric acid and waste water are more, and the air pollution, environmental pollution and water pollution are relatively serious. At present, the problems existing in the traditional titanium dioxide calcination tail gas treatment technology are mainly the emission of sulfur dioxide, dust particles, non-condensable gas, water vapor and acid mist at high temperature and high humidity, which will directly or indirectly affect the implementation of the production process. At present, the mainstream titanium dioxide calcination tail gas treatment process in China includes cyclone dust collection, Venturi spray system, water washing tower, electric demisting, chimney and the like, and the corresponding treatment technologies have certain limitations and backwardness. Although the cyclone dust collector can recover most of the particles, there is still a problem of disordered emission of part of the particles, and sodium sulfite is generated in the tail gas alkali spraying process, and a large amount of sodium sulfite is discharged with the tail gas, resulting in high dust content of the tail gas. Practical new type content

[0005] The utility model discloses a titanium dioxide calcination tail gas treatment spray tower and tail gas treatment device, and intends to solve the technical problem that in the existing titanium dioxide calcination process, sodium sulfite is generated in the tail gas alkali spraying process, and a large amount of sodium sulfite is discharged with the tail gas, resulting in high dust content of the tail gas.

[0006] In order to solve the above-mentioned technical problems, the technical scheme adopted by the utility model is as follows:

[0007] A titanium dioxide calcination tail gas treatment spray tower, comprising a plurality of layers of spray assemblies arranged vertically from top to bottom, each layer of the spray assembly comprising a spray containing cavity and a rotating spray part, the spray containing cavity is arranged in a spiral structure, and a plurality of rotating spray parts are arranged at intervals in the bottom of the spray containing cavity, the rotating spray parts on the same spray containing cavity are different in length.

[0008] The utility model discloses a plurality of groups of the spray assembly from top to bottom setting can as far as possible to the spray tower with the tail gas in reaction absorption, can clean the inner wall of tower at different height simultaneously, prevent smoke dust accumulation, the spray containing cavity is used for providing support effect to the rotary spray piece, provides water source for rotary spray piece simultaneously, when needing to handle calcination tail gas, injects the spray water into the spray containing cavity, then is transported to the rotary spray piece, makes the rotary spray piece can rotate and sprays water even, forms greater coverage, realizes even spraying effect, the spiral setting can set up the rotary spray piece in large area, improves the contact of spray water and calcination tail gas, and does not influence the tail gas after purification treatment and discharges upwards, the rotary spray piece can rotate while spraying water, makes the water flow to different positions, can wash the dust on the spray tower wall, can also make spray water and tail gas contact fully, improves the spraying effect, because the length of the rotary spray piece on same spray containing cavity is different, makes the height of the rotary spray piece on the spray tower different, can fully react and absorb the tail gas in the spray tower, can clean the whole pipe wall simultaneously, improves the treatment effect of tail gas, increases the cleaning range of pipe wall.

[0009] The utility model discloses a kind of titanium dioxide calcination tail gas treatment spray towers, the rotary spray piece includes communicating pipe and rotary nozzle, the communicating pipe one end is connected with the spray containing cavity, the communicating pipe other end is connected with the rotary nozzle.

[0010] By the technical scheme, the communicating pipe is connected with the spray containing cavity, for providing spray water to the rotary nozzle on the communicating pipe, the rotary nozzle can spray high-speed rotating water mist, which can uniformly spray water mist into the air, thereby adsorbing and settling dust particles suspended in the air, effectively reducing dust concentration and improving air quality. The spray effect can be guaranteed while saving water resources and energy consumption. Moreover, secondary pollution will not be generated during the spraying process, which is friendly to the environment. It should be noted that the rotary nozzle is a prior art and is widely used in agricultural irrigation, landscaping and other fields, such as model MP800SR rotary nozzle. Therefore, further description is not provided here.

[0011] The utility model discloses a kind of titanium dioxide calcination tail gas treatment spray towers, the communicating pipe includes main pipe and branch pipe, the main pipe one end is connected with the spray containing cavity, the main pipe other end side wall is intervally provided with a plurality of branch pipes, each branch pipe is connected with a rotary nozzle.

[0012] Adopt this technical scheme, the main pipe is connected with the spray containing cavity, the spray water in the spray containing cavity can be introduced into each branch pipe, each branch pipe is connected with one rotating nozzle, rotating spray can be carried out at different positions, full contact with tail gas smoke and overall coverage can be realized, and tail gas treatment effect is improved.

[0013] The utility model discloses a kind of titanium dioxide calcination tail gas treatment spray towers, the length of the main pipe on the same spray containing cavity is different, and the length of the main pipe is less than the distance between two adjacent spray containing cavities.

[0014] Adopt this technical scheme, the length of the main pipe is different, so that the rotating nozzle can spray at different heights inside the spray tower, i.e. tail gas in the spray tower can be fully reacted and absorbed, while the entire pipe wall can be cleaned, improving the treatment effect of tail gas and increasing the cleaning range of the pipe wall.

[0015] The utility model discloses a kind of titanium dioxide calcination tail gas treatment spray towers, and the spray containing cavity includes several hollow annular rings, and the hollow annular rings are connected through.

[0016] Adopt this technical scheme, the spray containing cavity is formed by several hollow annular rings connected through, which can store spray water inside the spray containing cavity and provide spray water for the rotating spray element. The rotating spray element can be evenly arranged to improve the contact between spray water and calcination tail gas. Water can be supplied to each rotating spray element through the water inlet without affecting the upward discharge of purified tail gas from the gap.

[0017] The utility model discloses a kind of titanium dioxide calcination tail gas treatment spray towers, and the spray containing cavity is set as hollow structure, and the spray containing cavity upper is provided with water inlet.

[0018] Adopt this technical scheme, the water inlet is used to deliver spray water to the spray containing cavity, and the spray containing cavity is set as hollow structure, which can store spray water inside the spray containing cavity and provide spray water for the rotating spray element.

[0019] The utility model discloses a kind of titanium dioxide calcination tail gas treatment spray towers, and each spray assembly is provided with a filter layer below, and the filter layer is below the rotating nozzle.

[0020] Adopt this technical scheme, the filter layer is arranged below the spray assembly, which is beneficial to the full contact, absorption and neutralization reaction of gas-liquid two-phase to adsorb pollutants such as sulfur dioxide contained in waste gas, and improve the absorption effect of tail gas treatment.

[0021] The application discloses a titanium white calcination tail gas treatment device.

[0022] The application discloses a titanium white calcination tail gas treatment device.

[0023] The application discloses a titanium white calcination tail gas treatment device.

[0024] Adopting the technical scheme, tail gas generated in the calcination process of titanium dioxide produced by the sulfuric acid method is sequentially subjected to dust absorption by the cyclone dust collector, absorption of acidic pollutants such as sulfur dioxide in the tail gas by the acid mist spray tower, removal of acid mist carried in the tail gas and reduction of the temperature of the tail gas by the first spray tower, further removal of sulfur dioxide by the alkali liquor spray tower, and removal of sodium sulfite generated by the alkali liquor spray tower from the tail gas after treatment by the alkali liquor spray tower, so as to reduce the dust content in the tail gas, ensure that the tail gas emission meets the standard, reduce environmental pollution, meet the environmental protection requirements, the first communication pipe connects the first spray tower and the acid mist spray tower, and acidic spray liquor is obtained after water spraying, the acidic spray liquor is not subjected to recycling treatment, but directly flows back to the acid mist spray tower to be used as acid washing liquid for acid spraying, so that the wastewater post-treatment operation is reduced, and the second spray tower and the alkali liquor spray tower are connected in penetration, reaction liquid after spraying by the second spray tower flows back to the alkali liquor spray tower, so that the wastewater treatment operation is reduced, and the reaction liquid is reasonably utilized, so that the tail gas treatment realizes cyclic use, energy saving and environmental protection.

[0025] The acid mist spray tower, the first spray tower, the alkali liquor spray tower and the second spray tower are connected in penetration, reaction liquid after spraying by the second spray tower flows back to the alkali liquor spray tower, so that the wastewater treatment operation is reduced, and the reaction liquid is reasonably utilized, so that the tail gas treatment realizes cyclic use, energy saving and environmental protection.

[0026] Adopting the technical scheme, the acid mist spray tower, the first spray tower, the alkali liquor spray tower and the second spray tower are connected in penetration, reaction liquid after spraying by the second spray tower flows back to the alkali liquor spray tower, so that the wastewater treatment operation is reduced, and the reaction liquid is reasonably utilized, so that the tail gas treatment realizes cyclic use, energy saving and environmental protection.

[0027] As the above technical scheme is adopted, the beneficial effects of the present application are as follows:

[0028] 1. By increasing water spraying after alkali liquor spraying, sulfur dioxide, dust in the tail gas and sodium sulfite or sodium bisulfite generated by the reaction of alkali liquor and sulfur dioxide can be further absorbed, the dust content in the tail gas is further reduced, and the tail gas emission standard is reached;

[0029] 2. While the rotary spray part rotates, water is uniformly sprayed, forming a larger coverage area, which not only saves water resources, but also realizes more uniform spraying effect, in addition, the water flow washes the smoke dust and easy sticking position in the spray tower, forming a water film to prevent smoke dust accumulation, at the same time, the water spray of the spray head on the spray tower wall forms water mist, which combines with the smoke dust flowing with the wind, playing a dust reduction role;

[0030] 3. The inside of the spray accommodating cavity is provided with a hollow structure, which can store the spray water in the inside of the spray accommodating cavity to treat the tail gas when the water suddenly stops, so that the tail gas treatment progress is not affected in a short time, and a certain buffer time is provided for the construction unit;

[0031] 4. The first communication pipe connects the first spray tower and the acid mist spray tower, the acid spray liquid obtained after water spraying through the first spray tower is not recycled, but directly flows back to the acid mist spray tower to be used as the pickling liquid for acid spraying, the second spray tower is connected with the alkali spray tower, the reaction liquid after spraying in the second spray tower flows back to the alkali spray tower, so that the operation of waste water treatment is reduced, the reaction liquid is reasonably used, and the tail gas treatment realizes cyclic use, energy saving and environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0032] The utility model will be through example and the mode of referring to the drawing, wherein:

[0033] Figure 1 It is whole structure schematic diagram of the utility model;

[0034] Figure 2 It is internal structure perspective view of spray tower in the utility model;

[0035] Figure 3 It is overhead view of spray accommodating cavity in example 1;

[0036] Figure 4 It is structure schematic diagram of spray accommodating cavity in example 2;

[0037] Figure 5 It is structure schematic diagram of communication pipe.

[0038] REFERENCE NUMERALS

[0039] 1-cyclone, 2-acid mist spray tower, 3-alkali spray tower, 4-first spray tower, 5-second spray tower, 6-filter layer, 7-spray accommodating cavity, 8-communication pipe, 801-main pipe, 802-branch pipe, 9-rotary nozzle, 10-water inlet, 11-ventilation pipeline, 12-first communication pipe, 13-second communication pipe, 14-first check valve, 15-second check valve, 16-collecting tank, 17-penetration pipe. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and indicated in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0041] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] In order to make those skilled in the art better understand the technical scheme of the present application, the present application will be further described in detail below in conjunction with the drawings.

[0043] Embodiment 1

[0044] A titanium dioxide calcination tail gas treatment spray tower, comprising a plurality of layers of spray assemblies arranged longitudinally from top to bottom, each layer of the spray assembly comprising a spray containing cavity 7 and a rotating spray element, the spray containing cavity 7 is arranged in a spiral structure, and a plurality of rotating spray elements are arranged at intervals in the bottom of the spray containing cavity 7, the rotating spray elements located on the same spray containing cavity 7 are different in length.

[0045] The setting of the plurality of groups of the spraying assembly from top to bottom can react and absorb the tail gas in the spraying tower as much as possible, can clean the inner wall of the tower at different heights, prevents smoke accumulation, the spraying containing cavity 7 is used for providing support for the rotating spraying part, simultaneously provides water source for the rotating spraying part, when needing to process the calcination tail gas, injects the spraying water into the spraying containing cavity 7, then is transported to the rotating spraying part, so that the rotating spraying part can spray water uniformly while rotating, forms greater coverage, realizes uniform spraying effect, the spiral setting can set the rotating spraying part in a large area, improves the contact of spraying water and calcination tail gas, and does not affect the tail gas after purification treatment from the gap upwardly, the rotating spraying part can rotate while spraying water, so that water flow rushes to different positions, can not only flush the dust on the tower wall of the spraying tower, but also can make the spraying water and tail gas fully contact, improve the spraying effect, since the rotating spraying parts on the same spraying containing cavity 7 are different in length, the height of the rotating spraying part on the spraying tower is different, that is, the tail gas in the spraying tower can be fully reacted and absorbed, and the whole pipe wall can be cleaned, the treatment effect of the tail gas is improved, and the cleaning range of the pipe wall is increased.

[0046] The rotating spraying part includes a communicating pipe 8 and a rotating spray head 9, one end of the communicating pipe 8 is connected with the spraying containing cavity 7 in a penetrating mode, and the other end of the communicating pipe 8 is connected with the rotating spray head 9.

[0047] By adopting the technical scheme, the communicating pipe 8 is connected with the spraying containing cavity 7, and is used for providing spraying water for the rotating spray head 9 on the communicating pipe 8, the high-speed rotating water mist of the rotating spray head 9 can uniformly spray the water mist into the air, so that dust particles suspended in the air are adsorbed and settled, the dust concentration is effectively reduced, the air quality is improved, the spraying effect can be ensured, water resources and energy consumption are saved, and secondary pollution is not caused in the spraying process, which is environment-friendly.

[0048] The communicating pipe 8 includes a main communicating pipe 801 and branch pipes 802, one end of the main communicating pipe 801 is connected with the spraying containing cavity 7 in a penetrating mode, and a plurality of branch pipes 802 are arranged on the side wall of the other end of the main communicating pipe 801 at intervals, and each branch pipe 802 is connected with a rotating spray head 9.

[0049] By adopting the technical scheme, the main communicating pipe 801 is connected with the spraying containing cavity 7 in a penetrating mode, the spraying water in the spraying containing cavity 7 can be introduced into each branch pipe 802, each branch pipe 802 is connected with a rotating spray head 9, and the spraying water can be sprayed and sprayed at different positions, so that the tail gas smoke is fully contacted and fully covered, and the tail gas treatment effect is improved.

[0050] The length of the main through pipe 801 located on the same spray containing cavity 7 is different, and the length of the main through pipe 801 is less than the distance between two adjacent spray containing cavities 7.

[0051] By adopting the technical scheme, the length of the main through pipe 801 is different, so that the rotating spray head 9 can spray at different heights inside the spray tower, that is, the tail gas in the spray tower can be fully reacted and absorbed, and the entire pipe wall can be cleaned, thereby improving the treatment effect on the tail gas and increasing the cleaning range of the pipe wall.

[0052] The spray containing cavity 7 is provided in a hollow structure, and a water inlet 10 is arranged above the spray containing cavity 7.

[0053] By adopting the technical scheme, the water inlet 10 is used for conveying spray water to the spray containing cavity 7, the spray containing cavity 7 is provided in a hollow structure, and is used for providing spray water storage and conveying, and can use the spray water stored in the spray containing cavity 7 to treat tail gas when water supply is suddenly stopped, so that the treatment progress of the tail gas is not affected in a short period of time, and a certain buffer time is provided for a construction unit.

[0054] A filter layer 6 is arranged below each group of spray assemblies, and the filter layer 6 is located below the rotating spray head 9.

[0055] By arranging the filter layer 6 below the spray assembly, the gas-liquid two-phase full-contact absorption and neutralization reaction is facilitated, so that the pollutants such as sulfur dioxide contained in the waste gas are adsorbed, the absorption effect of the tail gas treatment is improved, the gas-liquid two-phase full-contact absorption and neutralization reaction is facilitated, so that the pollutants such as sulfur dioxide contained in the waste gas are adsorbed, the absorption effect of the tail gas treatment is improved, the filter layer 6 is composed of a skeleton material and a filler with a large specific surface area on the surface, and the pollutants are dissolved and adsorbed by fully contacting with the treatment medium on the filter layer 6.

[0056] A titanium dioxide calcination tail gas treatment device, comprising a cyclone dust collector 1, an acid mist spray tower 2 and an alkali spray tower 3 connected in sequence, further comprising a spray tower, the spray tower comprises a first spray tower 4 and a second spray tower 5, one side of the first spray tower 4 is connected with the acid mist spray tower 2, the other side of the first spray tower 4 is connected with the alkali spray tower 3, and the alkali spray tower 3 is further connected with the second spray tower 5.

[0057] Adopt this technical scheme, the calcination tail gas of sulfuric acid method production titanium dioxide is discharged after being treated by the cyclone dust collector 1, the acid mist spray tower 2, the first spray tower 4, the lye spray tower 3 and the second spray tower 5 in turn, meets the standard of tail gas emission, the cyclone dust collector 1 by high-speed rotating airflow, the dust particles in tail gas are introduced into the cyclone dust collector 1, so that tail gas is subjected to the action of centrifugal force, thereby separating dust particles from gas, with higher dust removal efficiency, the acid mist spray tower 2 uses acidifying agent to further treat the tail gas treated by the cyclone dust collector 1, can effectively reduce tail gas pollutants, such as sulfur dioxide and nitrogen oxides, the first spray tower 4 further absorbs sulfur dioxide and dust of tail gas, reduces tail gas temperature, the lye spray tower 3 removes sulfur dioxide by alkaline water washing, adopts sodium hydroxide and sulfur dioxide reaction to generate sodium sulfite solution or sodium bisulfite solution, to remove sulfur dioxide in tail gas, by water spray, sulfur dioxide, dust in tail gas and sodium sulfite or sodium bisulfite generated by the reaction of lye and sulfur dioxide are absorbed, further reduce the dust content in tail gas, reach the tail gas emission standard, by the rotating spray piece, water is uniformly sprayed out while rotating, forming a larger coverage area, not only saves water resources, but also can realize more uniform spraying effect, in addition, by the water flow flushing the smoke dust and easy sticking position in the spray tower, a layer of water film is formed to prevent smoke dust accumulation, at the same time, the water of the spray head hits the spray tower wall to form water mist, combined with the smoke dust flowing with the wind, plays a role in dust reduction.

[0058] The cyclone dust collector 1, the acid mist spray tower 2, the first spray tower 4, the lye spray tower 3 and the second spray tower 5 are connected in turn through the air duct 11, the first spray tower 4 bottom and the acid mist spray tower 2 bottom are connected through the first communication pipe 12, and the second spray tower 5 bottom and the lye spray tower 3 bottom are connected through the second communication pipe 13.

[0059] Adopting the technical scheme, tail gas generated in the calcination process of the sulfuric acid method for producing titanium dioxide is sequentially subjected to dust absorption by the cyclone dust collector 1, absorption of acidic pollutants such as sulfur dioxide in the tail gas by the acid mist spray tower 2, removal of acid mist carried in the tail gas and reduction of the temperature of the tail gas by the first spray tower 4, further removal of sulfur dioxide by alkaline water washing by the alkali spray tower 3, and removal of sodium sulfite generated by the tail gas after being treated by the alkali spray tower 3 by the second spray tower 5, so as to reduce the dust content in the tail gas. Through the complete tail gas treatment process, it is ensured that the tail gas emission meets the standard, the environmental pollution is reduced, the environmental protection requirement is met, the first communication pipe 12 connects the first spray tower 4 and the acid mist spray tower 2, the acidic spray liquid obtained after water spraying is not subjected to recycling treatment, but directly flows back to the acid mist spray tower 2 to be used as acid washing liquid for acid spraying, so that the wastewater post-treatment operation is reduced, the second spray tower 5 is connected with the alkali spray tower 3, the reaction liquid after being sprayed by the second spray tower 5 flows back to the alkali spray tower 3, so that the wastewater treatment operation is reduced, the reaction liquid is reasonably utilized, the tail gas treatment is recycled, energy is saved, and the environmental protection is realized, the first one-way valve 14 arranged on the first communication pipe 12 can ensure that the acidic spray liquid flows from the first spray tower 4 to the acid mist spray tower 2, and prevent the spray liquid in the acid mist spray tower 2 from flowing into the first spray tower 4, and the second one-way valve 15 is arranged to prevent the liquid in the alkali spray tower 3 from flowing into the second spray tower 5, so that the liquid flow direction is effectively controlled.

[0060] The acid mist spray tower 2, the first spray tower 4, the alkali spray tower 3 and the second spray tower 5 are all provided below with a collecting tank 16.

[0061] Adopting the technical scheme, the acid mist spray tower 2, the first spray tower 4, the alkali spray tower 3 and the second spray tower 5 in the process of spray treatment of the calcination tail gas, the impurities and other precipitates generated by the reaction between each spray liquid and the pollutants in the tail gas, the collecting tank 16 is used to collect the precipitates and reaction liquid in each spray tower, so as to avoid direct emission and pollution of the environment.

[0062] Example 2

[0063] The spray containing cavity 7 comprises a plurality of hollow annular rings, and the hollow annular rings are connected through.

[0064] By adopting the technical scheme, the spray containing cavity 7 is formed by a plurality of hollow annular rings in through connection, can store spray water inside the spray containing cavity 7, provides spray water for the rotary spray part, can uniformly arrange the rotary spray part, improves the contact between the spray water and the calcination tail gas, and also makes the rotary spray part be supplied with water through the water inlet 10, and does not affect the tail gas after purification treatment to be discharged upward from the gap.

[0065] The above description of disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will accord with the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spray tower for treating titanium dioxide calcination off-gas, characterized in that: The spray tower comprises a plurality of spray assemblies arranged longitudinally from top to bottom, each of the spray assemblies comprises a spray accommodating cavity (7) and a rotating spray element, the spray accommodating cavity (7) is arranged in a spiral structure, and a plurality of rotating spray elements are arranged through the bottom of the spray accommodating cavity (7) at intervals, and the rotating spray elements arranged on the same spray accommodating cavity (7) are different in length.

2. The spray tower for treating titanium dioxide calcination tail gas according to claim 1, characterized in that: The rotating spray element comprises a communicating pipe (8) and a rotating spray head (9), one end of the communicating pipe (8) is connected with the spray accommodating cavity (7) through, and the other end of the communicating pipe (8) is connected with the rotating spray head (9).

3. The spray tower for treating titanium dioxide calcination tail gas according to claim 2, characterized in that: The communicating pipe (8) comprises a main pipe (801) and a branch pipe (802), one end of the main pipe (801) is connected with the spray accommodating cavity (7) through, and a plurality of branch pipes (802) are arranged on the side wall of the other end of the main pipe (801) at intervals, and each branch pipe (802) is connected with one rotating spray head (9).

4. The spray tower for treating titanium dioxide calcination tail gas according to claim 3, characterized in that: The main pipes (801) arranged on the same spray accommodating cavity (7) are different in length, and the length of the main pipe (801) is smaller than the distance between two adjacent spray accommodating cavities (7).

5. The spray tower for treating titanium dioxide calcination tail gas according to claim 1, characterized in that: The spray accommodating cavity (7) comprises a plurality of cavity annular rings, and the cavity annular rings are connected through.

6. A spray tower for treating titanium dioxide calcination off-gas according to claim 1, characterized in that: The spray accommodating cavity (7) is arranged in a hollow structure, and a water inlet (10) is arranged above the spray accommodating cavity (7).

7. The spray tower for treating titanium dioxide calcination tail gas according to claim 2, characterized in that: A filter layer (6) is arranged below each group of spray assemblies, and the filter layer (6) is arranged below the rotating spray head (9).

8. A titanium dioxide calcination tail gas treatment device, comprising a cyclone dust collector (1), an acid mist spray tower (2) and an alkali liquor spray tower (3) connected in sequence, characterized in that: The spray tower comprises a first spray tower (4) and a second spray tower (5), one side of the first spray tower (4) is connected with the acid mist spray tower (2), the other side of the first spray tower (4) is connected with one side of the lye spray tower (3), and the other side of the lye spray tower (3) is connected with the second spray tower (5).

9. The titanium dioxide calcination off-gas treatment device according to claim 8, characterized in that: The cyclone dust collector (1), the acid mist spray tower (2), the first spray tower (4), the lye spray tower (3) and the second spray tower (5) are sequentially connected through an air duct (11).

10. The titanium dioxide calcination off-gas treatment device according to claim 8, characterized in that: The acid mist spray tower (2), the first spray tower (4), the lye spray tower (3) and the second spray tower (5) are provided with a collecting groove (16) below.

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