Efficient nitric acid bleaching device

Abstract

The utility model provides an efficient nitric acid bleaching device which comprises a tower body, the tower body is a hollow cylinder, a seal head is arranged at the upper end of the tower body, a bottom cover is arranged at the lower end of the tower body, and the seal head and the bottom cover are respectively connected with the tower body in a sealed mode. The tower body is provided with a liquid distributor, a filler, a liquid collector and a pore plate, and the liquid distributor, the filler, the liquid collector and the pore plate are sequentially arranged along the tower body from top to bottom. The end socket is provided with an air outlet pipe, the bottom cover is provided with a liquid outlet pipe, and a liquid inlet pipe is arranged on the upper side of the tower body and connected with the liquid distributor. A gas inlet pipe is arranged on the lower side of the tower body. A base is arranged on the lower side of the tower body and connected with the bottom cover, and a liquid outlet of the liquid outlet pipe is formed in the side wall of the base. According to the nitric acid bleaching device, the contact area of fuming nitric acid and hot air is increased, the reaction efficiency is improved, the liquid outlet speed is controlled through the pore plate, the treatment effect is ensured, and the nitric acid concentration is improved.

Description

Technical Field

[0001] The utility model belongs to a nitric acid production device, in particular to a high-efficiency nitric acid bleaching device. Background Art

[0002] Nitric acid is an important inorganic chemical product and a key raw material for the manufacture of fertilizers, explosives, dyes, nitro compounds, and pharmaceuticals. Nitric acid is highly acidic and oxidizing, so it is often used as an etchant and cleaning agent in the manufacturing process of photovoltaic cells and electronic components. With the development of the photovoltaic industry and the electronic information industry and the demand for agricultural modernization, the market demand for nitric acid continues to increase. The nitric acid industry is facing the pressure of technological progress, improving energy efficiency, reducing costs, and improving efficiency.

[0003] The nitric acid bleaching tower is used to precipitate the excess nitrogen oxides in the generated concentrated nitric acid to produce qualified concentrated nitric acid products. The traditional nitric acid bleaching tower has a low bleaching efficiency for fuming nitric acid, and the concentration of nitric acid produced cannot meet the requirements of etching silicon wafers in the photovoltaic industry and electronic cleaning in the electronic cleaning industry.

[0004] Therefore, the above problems need to be solved urgently. Utility Model Content

[0005] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a high-efficiency nitric acid bleaching device, which increases the contact area between fuming nitric acid and hot air, improves reaction efficiency, improves production efficiency, controls the liquid outlet speed through a orifice plate, ensures the treatment effect, and increases the nitric acid concentration.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides a high-efficiency nitric acid bleaching device, including a tower body, which is a hollow cylinder. A head is provided at the upper end of the tower body, and a bottom cover is provided at the lower end of the tower body. The head and the bottom cover are respectively and tightly connected to the tower body. The tower body is provided with a liquid distributor, a filler, a liquid collector, and a perforated plate. The liquid distributor, the filler, the liquid collector, and the perforated plate are arranged in sequence along the tower body from top to bottom. The head is provided with an air outlet pipe, the bottom cover is provided with a liquid outlet pipe, and the upper part of the tower body is provided with a liquid inlet pipe, which is connected to the liquid distributor. The lower part of the tower body is provided with an air inlet pipe. A base is provided on the lower side of the tower body, which is connected to the bottom cover, and the discharge port of the liquid outlet pipe is arranged on the side wall of the base. During the production of nitric acid, fuming nitric acid enters the liquid distributor from the liquid inlet pipe on the upper side of the tower body, and hot air is sent in from the air inlet pipe. The liquid distributor evenly distributes the fuming nitric acid so that the fuming nitric acid flows evenly into the packing. The nitric acid flowing out of the packing is redistributed by the liquid collector, throttled by the orifice plate, and finally the bleached nitric acid flows out from the liquid outlet pipe provided on the bottom cover, and the hot air flows out from the air outlet pipe. In the nitric acid bleaching device, the liquid distributor ensures that the fuming nitric acid enters evenly from the top of the packing, the packing increases the contact area between the fuming nitric acid and the hot air, so that the nitrogen oxides dissolved in the nitric acid react with oxygen to re-produce nitric acid, the liquid collector gathers and redistributes the nitric acid, avoids wall flow, improves the gas-liquid contact efficiency, and improves the product concentration. The orifice plate controls the flow of nitric acid through the size and shape of the holes, controls the flow of nitric acid entering the liquid outlet pipe, and maintains a suitable processing efficiency. The utility model high-efficiency nitric acid bleaching device increases the contact area between the fuming nitric acid and the hot air, improves the reaction efficiency, controls the liquid outlet speed through the orifice plate, ensures the processing effect, and improves the nitric acid concentration.

[0007] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, the liquid distributor includes a transverse tube and a branch tube, and the branch tubes are provided with 2 or more branch tubes, which are provided on both sides of the transverse tube, and the axis of the transverse tube is arranged perpendicular to the axis of the branch tube, and the branch tube and the transverse tube are connected, and the free ends of the branch tube and the transverse tube are sealed respectively. The transverse tube and the branch tube are provided with a liquid outlet on the side facing the liquid collector, and the liquid outlets are arranged in an array along the axis of the transverse tube and the branch tube, respectively. The transverse tube is provided with a liquid inlet on the side away from the liquid collector, and the liquid inlet and the liquid inlet pipe are sealed and connected. Fuming nitric acid enters the liquid distributor from the liquid inlet, and flows out from the liquid outlet provided on the transverse tube and the branch tube. The fuming nitric acid is evenly distributed on the top of the filler, ensuring that the filler is evenly covered by the liquid, avoiding the occurrence of channel flow and wall flow, and increasing the contact area and time between the gas-liquid two phases, thereby improving the rate and efficiency of the bleaching reaction, and increasing the processing capacity and nitric acid concentration.

[0008] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, a support ring is provided at the lower side of the liquid distributor, the support ring is a hollow ring, the support ring is fixed inside the tower body, the liquid distributor is placed on the top surface of the support ring, and the support ring supports the liquid distributor.

[0009] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, the liquid collector is in the shape of a dish, and includes a liquid collector portion and a bottom portion. The liquid collector portion is inclined at the periphery of the bottom portion, and the liquid collector portion gathers the liquid to the bottom portion. The bottom portion is provided with a plurality of through holes. The liquid collector gathers the liquid flowing down from the filler to avoid the wall flow phenomenon. The liquid is redistributed at the bottom of the liquid collector, and the liquid is decomposed into evenly distributed droplets, increasing the liquid gap, increasing the contact area between the gas-liquid two phases, and the liquid flows through the through holes at the bottom, which can help separate the gas and liquid and improve the reaction efficiency.

[0010] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, the orifice plate has multiple liquid holes, and in order to set as many liquid holes as possible, the liquid holes are arranged in an equilateral triangle array at equal intervals. The liquid holes on the orifice plate limit the liquid flow rate, control the liquid to enter the bottom of the tower body, promote gas-liquid mixing, and enhance the bleaching reaction efficiency. The orifice plate can also avoid the impact of airflow on the liquid and prevent liquid flooding.

[0011] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, a grid plate is provided at the lower side of the packing to support the packing, and a packing pressing plate is provided at the upper side of the packing to squeeze the packing. The packing pressing plate can prevent the packing from being displaced due to the impact of airflow, and ensure that the gaps in the packing are uniform.

[0012] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, the tower body includes a head section, an upper section, a middle section, and a lower section, and the head section, the upper section, the middle section, and the lower section are connected in sequence from top to bottom.

[0013] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, the air inlet pipe includes an air inlet flange, a pipe body, and an air inlet. The pipe body extends into the interior of the tower body. The air inlet flange is arranged on the outside of the tower body and connected to the air inlet device. The air inlet flange is connected to an opening at one end of the pipe body. The pipe body is provided with an air inlet, and the air inlet is arranged inside the tower body.

[0014] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, in order to ensure that the hot air flows from bottom to top, the air inlet is arranged at the end of the tube body away from the air inlet flange, the cross-section of the air inlet and the axis of the tube body form an angle of 45 degrees, and the air inlet intakes air obliquely downward to ensure uniform distribution of airflow, improve gas phase mixing, and improve the efficiency of the bleaching reaction.

[0015] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, one end of the tube body away from the air inlet flange is sealed, and the air inlet is arranged on the side wall of the tube body. The air inlet intakes air horizontally, and the gas moves along the tower body to generate a vortex, so that the gas is dispersed into smaller bubbles, increasing the gas-liquid interface area, promoting gas-liquid mixing, and improving the processing efficiency.

[0016] Furthermore, in the above-mentioned high-efficiency nitric acid bleaching device, a defoamer is provided at the head in order to separate the nitric acid solution carried in the rising gas.

[0017] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the utility model high-efficiency nitric acid bleaching device is provided with a liquid distributor, a filler, a liquid collector, and a perforated plate, so as to increase the contact area between the fuming nitric acid and the hot air, improve the reaction efficiency, control the liquid outlet speed through the perforated plate, ensure the treatment effect, and improve the nitric acid concentration. The liquid flow is limited by the perforated plate, and the liquid is controlled to enter the bottom of the tower body, so as to promote gas-liquid mixing and enhance the bleaching reaction efficiency. The perforated plate can also avoid the impact of airflow on the liquid and prevent liquid flooding. The air inlet is horizontally inlet, and the gas moves along the tower body to generate a vortex, so that the gas is dispersed into smaller bubbles, the gas-liquid interface area is increased, the gas-liquid mixing is promoted, and the treatment efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of the utility model high-efficiency nitric acid bleaching device;

[0019] Figure 2 A bottom view of the liquid distributor;

[0020] Figure 3 is a front view of the support ring;

[0021] Figure 4 is a cross-sectional view of the liquid collecting device;

[0022] Figure 5 is a top view of the orifice plate;

[0023] Figure 6 is a top view of the grid plate;

[0024] Figure 7 is a top view of the packing pressure plate;

[0025] Figure 8-9 It is a front view of the intake pipe.

[0026] In the figure: 1, tower body, 11, head, 111, air outlet pipe, 12, bottom cover, 121, liquid outlet pipe, 13, liquid distributor, 131, branch pipe, 132, cross pipe, 133, liquid outlet, 135, support ring, 14, packing, 141, grid plate, 142, packing pressure plate, 15, liquid collector, 151, liquid collector, 152, bottom, 16, orifice plate, 161, liquid hole, 17, liquid inlet pipe, 18, air inlet pipe, 181, air inlet flange, 182, pipe body, 183, air inlet, 2, base, 10, head, 20, upper section, 30, middle section, 40, lower section. DETAILED DESCRIPTION

[0027] Example 1

[0028] like Figure 1The high-efficiency nitric acid bleaching device shown comprises a tower body 1, which is a hollow cylinder. The tower body 1 comprises a head 10, an upper section 20, a middle section 30, and a lower section 40, which are sequentially connected from top to bottom. A head cover 11 is provided at the upper end of the tower body 1, and a bottom cover 12 is provided at the lower end of the tower body 1. The head cover 11 and the bottom cover 12 are respectively and tightly connected to the tower body 1. The tower body 1 is provided with a liquid distributor 13, a filler 14, a liquid collector 15, and a perforated plate 16. The liquid distributor 13, the filler 14, the liquid collector 15, and the perforated plate 16 are sequentially arranged along the tower body 1 from top to bottom. The head cover 11 is provided with an air outlet pipe 111, the bottom cover 12 is provided with a liquid outlet pipe 121, and the upper section of the tower body 1 is provided with a liquid inlet pipe 17, which is connected to the liquid distributor 13. The lower section of the tower body 1 is provided with an air inlet pipe 18. A base 2 is provided at the lower side of the tower body 1, and the base 2 is connected to the bottom cover 12, and the discharge port of the liquid outlet pipe 121 is provided at the side wall of the base 2. In order to separate the nitric acid solution carried in the rising gas, a defoamer is provided at the head 10. During the production of nitric acid, the fuming nitric acid enters the liquid distributor 13 from the liquid inlet pipe 17 on the upper side of the tower body 1, and hot air is sent in from the air inlet pipe 18. The liquid distributor 13 evenly flows the fuming nitric acid into the packing 14, and then redistributes it through the liquid collector 15, and throttles through the orifice plate 16, and flows out from the liquid outlet pipe 121 provided on the bottom cover 12. The hot air is discharged from the air outlet pipe 111 provided on the head 11.

[0029] like Figure 2 In the high-efficiency nitric acid bleaching device shown, the liquid distributor 13 includes a transverse pipe 132 and a branch pipe 131. There are two or more branch pipes 131. The branch pipes 131 are arranged on both sides of the transverse pipe 132. The axis of the transverse pipe 132 is arranged perpendicular to the axis of the branch pipe 131. The branch pipes 131 and the transverse pipe 132 are connected. The free ends of the branch pipes 131 and the transverse pipe 132 are sealed. The transverse pipe 132 and the branch pipe 131 are provided with liquid outlets 133 on the side facing the liquid collector 15. The liquid outlets 133 are arranged in an array along the axis of the transverse pipe 132 and the branch pipe 131. The transverse pipe 132 is provided with a liquid inlet on the side away from the liquid collector 15. The liquid inlet is sealed and connected to the liquid inlet pipe 17. The liquid distributor 13 evenly distributes the fuming nitric acid from the liquid outlets 133 provided on the transverse pipe 132 and the branch pipe 131 to the top of the filler.

[0030] like Figure 3 In the high-efficiency nitric acid bleaching device shown, a support ring 135 is provided at the lower side of the liquid distributor 13. The support ring 135 is a hollow ring. The support ring 135 is fixed inside the tower body 1. The liquid distributor 13 is placed on the top surface of the support ring 135. The support ring 135 supports the liquid distributor 13.

[0031] like Figure 4In the high-efficiency nitric acid bleaching device shown, the liquid collector 15 is in the shape of a dish, and includes a liquid collector portion 151 and a bottom portion 152. The liquid collector portion 151 is arranged obliquely at the periphery of the bottom portion 152, and the liquid collector portion 151 gathers the liquid to the bottom portion 152. The bottom portion 152 is provided with a plurality of through holes. The liquid collector 15 gathers the liquid flowing down from the filler. The liquid is redistributed at the bottom of the liquid collector 15, and the liquid is decomposed into evenly distributed droplets.

[0032] like Figure 5 In the high-efficiency nitric acid bleaching device shown, the orifice plate 16 is penetrated by a plurality of liquid holes 161. In order to arrange as many liquid holes 161 as possible, the liquid holes 161 are arranged in an equilateral triangle array at equal intervals.

[0033] like Figure 6-7 In the high-efficiency nitric acid bleaching device shown, a grid plate 141 is provided at the lower side of the filler 14 to support the filler 14 , and a filler pressing plate 142 is provided at the upper side of the filler 14 to squeeze the filler 14 .

[0034] like Figure 8 In the high-efficiency nitric acid bleaching device shown, the air inlet pipe 18 includes an air inlet flange 181, a pipe body 182, and an air inlet 183. The pipe body 182 extends into the interior of the tower body 1. The air inlet flange 181 is arranged outside the tower body 1 and connected to the air inlet device. The air inlet flange 181 is connected to an opening at one end of the pipe body 182. The pipe body 182 is provided with an air inlet 183, and the air inlet 183 is arranged inside the tower body. In order to ensure that the hot air flows from bottom to top, the air inlet 183 is arranged at one end of the pipe body 182 away from the air inlet flange 181. The cross section of the air inlet 183 forms an angle of 45 degrees with the axis of the pipe body 182, and the air inlet takes in air obliquely downward.

[0035] Example 2

[0036] like Figure 1The high-efficiency nitric acid bleaching device shown comprises a tower body 1, which is a hollow cylinder. The tower body 1 comprises a head 10, an upper section 20, a middle section 30, and a lower section 40, which are sequentially connected from top to bottom. A head cover 11 is provided at the upper end of the tower body 1, and a bottom cover 12 is provided at the lower end of the tower body 1. The head cover 11 and the bottom cover 12 are respectively and tightly connected to the tower body 1. The tower body 1 is provided with a liquid distributor 13, a filler 14, a liquid collector 15, and a perforated plate 16. The liquid distributor 13, the filler 14, the liquid collector 15, and the perforated plate 16 are sequentially arranged along the tower body 1 from top to bottom. The head cover 11 is provided with an air outlet pipe 111, the bottom cover 12 is provided with a liquid outlet pipe 121, and a liquid inlet pipe 17 is provided on the upper side of the tower body 1, and the liquid inlet pipe 17 is connected to the liquid distributor 13. An air inlet pipe 18 is provided on the lower side of the tower body 1. A base 2 is provided at the lower side of the tower body 1, and the base 2 is connected to the bottom cover 12, and the discharge port of the liquid outlet pipe 121 is provided at the side wall of the base 2. In order to separate the nitric acid solution carried in the rising gas, a defoamer is provided at the head 10. During the production of nitric acid, the fuming nitric acid enters the liquid distributor 13 from the liquid inlet pipe 17 on the upper side of the tower body 1, and steam is fed into the air inlet pipe 18. The liquid distributor 13 evenly flows the fuming nitric acid into the packing 14, and then redistributes it through the liquid collector 15, and throttles through the orifice plate 16, and flows out from the liquid outlet pipe 121 provided on the bottom cover 12, and the hot air is discharged from the air outlet pipe 111 provided on the head 11.

[0037] like Figure 2 In the high-efficiency nitric acid bleaching device shown, the liquid distributor 13 includes a transverse tube 132 and a branch tube 131. There are two or more branch tubes 131. The branch tubes 131 are arranged on both sides of the transverse tube 132. The axis of the transverse tube 132 and the axis of the branch tube 131 are arranged perpendicularly. The branch tubes 131 and the transverse tube 132 are connected. The free ends of the branch tubes 131 and the transverse tube 132 are sealed respectively. The transverse tube 132 and the branch tube 131 are provided with liquid outlets 133 on the side facing the liquid collector 15. The liquid outlets 133 are arranged in an array along the axis of the transverse tube 132 and the branch tube 131 respectively. The transverse tube 132 is provided with a liquid inlet on the side away from the liquid collector 15. The liquid inlet is sealed and connected to the liquid inlet pipe 17. The liquid distributor 13 evenly distributes the fuming nitric acid from the liquid outlets 133 provided on the transverse tube 132 and the branch tube 131 to the top of the filler.

[0038] like Figure 3 In the high-efficiency nitric acid bleaching device shown, a support ring 135 is provided at the lower side of the liquid distributor 13. The support ring 135 is a hollow ring. The support ring 135 is fixed inside the tower body 1. The liquid distributor 13 is placed on the top surface of the support ring 135. The support ring 135 supports the liquid distributor 13.

[0039] like Figure 4In the high-efficiency nitric acid bleaching device shown, the liquid collector 15 is in the shape of a dish, and includes a liquid collector portion 151 and a bottom portion 152. The liquid collector portion 151 is arranged obliquely at the periphery of the bottom portion 152, and the liquid collector portion 151 gathers the liquid to the bottom portion 152. The bottom portion 152 is provided with a plurality of through holes. The liquid collector 15 gathers the liquid flowing down from the filler. The liquid is redistributed at the bottom of the liquid collector 15, and the liquid is decomposed into evenly distributed droplets.

[0040] like Figure 5 In the high-efficiency nitric acid bleaching device shown, the orifice plate 16 is penetrated by a plurality of liquid holes 161. In order to arrange as many liquid holes 161 as possible, the liquid holes 161 are arranged in an equilateral triangle array at equal intervals.

[0041] like Figure 6-7 In the high-efficiency nitric acid bleaching device shown, a grid plate 141 is provided at the lower side of the filler 14 to support the filler 14 , and a filler pressing plate 142 is provided at the upper side of the filler 14 to squeeze the filler 14 .

[0042] like Fig. 9 In the high-efficiency nitric acid bleaching device shown, the air inlet pipe 18 includes an air inlet flange 181, a pipe body 182, and an air inlet 183. The pipe body 182 extends into the interior of the tower body 1. The air inlet flange 181 is arranged outside the tower body 1 and connected to the air inlet device. The air inlet flange 181 is connected to an opening at one end of the pipe body 182. The pipe body 182 is provided with an air inlet 183, and the air inlet 183 is arranged inside the tower body. The pipe body 182 is sealed at one end away from the air inlet flange 181. The air inlet 183 is arranged on the side wall of the pipe body 182. The air inlet 183 is arranged close to the inner wall of the pipe body 182. The air inlet 183 takes in air horizontally, and the gas moves along the tower body 1 to generate a vortex.

[0043] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the utility model so that people familiar with this field can understand the content of the utility model and implement it accordingly, and they cannot limit the protection scope of the utility model in turn. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A high efficiency nitric acid bleaching device, characterized in that: The tower body (1) comprises a tower body (1), wherein the tower body (1) is a hollow cylinder, a head cover (11) is provided at the upper end of the tower body (1), and a bottom cover (12) is provided at the lower end of the tower body (1), wherein the head cover (11) and the bottom cover (12) are respectively connected to the tower body (1) in a sealed manner; the tower body (1) is provided with a liquid distributor (13), a filler (14), a liquid collector (15), and a perforated plate (16), wherein the liquid distributor (13), the filler (14), the liquid collector (15), and the perforated plate (16) are arranged along the tower body (1). The tower body (1) is provided with an air outlet pipe (111), the bottom cover (12) is provided with a liquid outlet pipe (121), the upper section of the tower body (1) is provided with a liquid inlet pipe (17), and the liquid inlet pipe (17) is connected to a liquid distributor (13); the lower section of the tower body (1) is provided with an air inlet pipe (18); the lower side of the tower body (1) is provided with a base (2), the base (2) is connected to the bottom cover (12), and the liquid outlet of the liquid outlet pipe (121) is provided on the side wall of the base (2).

2. The high-efficiency nitric acid bleaching device according to claim 1, characterized in that: The liquid distributor (13) comprises a transverse tube (132) and a branch tube (131). Two or more branch tubes (131) are provided. The branch tubes (131) are provided on both sides of the transverse tube (132). The axis of the transverse tube (132) is arranged perpendicular to the axis of the branch tube (131). The branch tube (131) and the transverse tube (132) are in communication. The free ends of the branch tube (131) and the transverse tube (132) are respectively sealed. The transverse tube (132) and the branch tube (131) are provided with liquid outlets (133) on the side facing the liquid collector (15). The liquid outlets (133) are respectively arranged in an array along the axis of the transverse tube (132) and the branch tube (131). The transverse tube (132) is provided with a liquid inlet on the side away from the liquid collector (15). The liquid inlet and the liquid inlet tube (17) are sealedly connected.

3. The high-efficiency nitric acid bleaching device according to claim 1, characterized in that: A support ring (135) is provided on the lower side of the liquid distributor (13); the support ring (135) is fixed inside the tower body (1); the liquid distributor (13) is placed on the top surface of the support ring (135); and the support ring (135) supports the liquid distributor (13).

4. The high-efficiency nitric acid bleaching device according to claim 1, characterized in that: The liquid collecting device (15) is in the shape of a dish, and comprises a liquid collecting portion (151) and a bottom portion (152). The liquid collecting portion (151) is arranged obliquely on the periphery of the bottom portion (152). The liquid collecting portion (151) collects liquid toward the bottom portion (152). The bottom portion (152) is provided with a plurality of through holes.

5. The high-efficiency nitric acid bleaching device according to claim 1, characterized in that: The orifice plate (16) is penetrated by a plurality of liquid holes (161), and the liquid holes (161) are arranged in an equilateral triangle array at equal intervals.

6. The high-efficiency nitric acid bleaching device according to claim 1, characterized in that: A grid plate (141) is provided on the lower side of the filler (14), the grid plate (141) supports the filler (14), and a filler pressing plate (142) is provided on the upper side of the filler (14), the filler pressing plate (142) presses the filler (14).

7. The high-efficiency nitric acid bleaching device according to claim 1, characterized in that: The tower body (1) comprises a head (10), an upper section (20), a middle section (30), and a lower section (40), wherein the head (10), the upper section (20), the middle section (30), and the lower section (40) are connected in sequence from top to bottom.

8. The high-efficiency nitric acid bleaching device according to claim 1, characterized in that: The air intake pipe (18) comprises an air intake flange (181), a pipe body (182), and an air intake port (183); the pipe body (182) extends into the interior of the tower body (1); the air intake flange (181) is arranged outside the tower body (1) and connected to an air intake device; the air intake flange (181) is connected to an opening at one end of the pipe body (182); the pipe body (182) is provided with an air intake port (183); and the air intake port (183) is arranged inside the tower body.

9. The high-efficiency nitric acid bleaching device according to claim 8, characterized in that: The air inlet (183) is arranged at one end of the tube body (182) away from the air inlet flange (181); the cross section of the air inlet (183) forms an angle of 45 degrees with the axis of the tube body (182); and the air inlet (183) inhales air obliquely downward.

10. The high-efficiency nitric acid bleaching device according to claim 8, characterized in that: One end of the tube body (182) away from the air inlet flange (181) is sealed, and the air inlet (183) is arranged on the side wall of the tube body (182), and the air inlet (183) takes in air horizontally.

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