Nitric oxide production off-gas treatment device

Abstract

The utility model relates to tail gas treatment equipment technical field discloses a nitrogen monoxide production tail gas treatment device, including spray tower and absorption tower, absorption tower is located one side of spray tower, one side below of spray tower is connected with the air inlet pipe, the inside assembly of spray tower has and links to each other the circulating assembly of spray assembly, circulating pump will collect liquid tank absorption liquid delivery to the storage ring, atomizes and sprays through annular spray head, the gas to be treated enters from the air inlet pipe, forms the cyclone through the cyclone vane in the flow guide box, makes the gas -liquid contact time extension, turbulent mixing enhances the mass transfer efficiency, makes the pollutant and absorption liquid fully contact and is absorbed efficiently, absorption liquid falls back to the collection liquid tank and is recycled, when spray tower runs, the absorption liquid after spraying is initially filtered through the dust sieve hole of flow guide box bottom surface, then is refined and filtered through the impurity filter board, after flowing into the collection liquid tank, is cooled by the condensing coil, finally is pumped back for use through the circulating pump, realizes absorption liquid recycling.

Description

Technical Field

[0001] This utility model relates to the technical field of exhaust gas treatment equipment, specifically to a nitrogen monoxide production exhaust gas treatment device. Background Technology

[0002] The exhaust gas we are talking about now mainly refers to automobile exhaust gas, that is, the exhaust gas emitted by automobiles from the exhaust pipe. Automobile exhaust gas is another major factor in air pollution. Automobile exhaust gas contains carbon monoxide, nitrogen oxides, and other solid particles that have adverse effects on the human body. Leaded gasoline, in particular, is even more harmful to the human body.

[0003] Chinese patent CN205638639U discloses a waste heat recovery treatment device for nitrogen dioxide-containing exhaust gas, including a waste heat recovery tower, an electrostatic precipitator plate, and a third centrifugal fan. A first centrifugal fan is installed at the bottom of the waste heat recovery tower, and an exhaust gas conveying pipe is installed at the top. A heat exchange tube is installed inside the waste heat recovery tower, and an air-cooling device is installed above the heat exchange tube. A second centrifugal fan is installed above the air-cooling device, and an activated carbon adsorption plate is installed above the second centrifugal fan. The electrostatic precipitator plate is installed above the activated carbon adsorption plate. A condensation separation device is installed on the right side of the waste heat recovery tower. This invention can thoroughly cool high-temperature exhaust gas, protect filtration equipment from damage, and the multi-layer adsorption and filtration layers can thoroughly adsorb harmful particulate matter in the exhaust gas, resulting in cleaner exhaust gas. Simultaneously, it achieves waste heat recovery, energy saving, and emission reduction.

[0004] However, the following shortcomings still exist:

[0005] During the exhaust gas treatment process, particulate matter contained in the exhaust gas is prone to deposition. During spray dust removal, the gas rises too fast, which prevents it from fully contacting the absorbent liquid. This not only hinders the uniform distribution of airflow but also reduces the reaction contact area. At the same time, a large amount of absorbent liquid is generated during the spraying process, resulting in a serious waste of resources. Therefore, those skilled in the art provide a nitric oxide production exhaust gas treatment device to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to provide a nitrogen monoxide production tail gas treatment device to solve the problems mentioned in the background art above.

[0007] This utility model provides the following technical solution: a nitrogen monoxide production tail gas treatment device, including a spray tower and an absorption tower, wherein the absorption tower is located on one side of the spray tower, an air inlet pipe is connected to the lower side of the spray tower, the spray tower is equipped with a spray assembly and a circulation assembly connected to the spray assembly, a demister is installed at the upper end of the spray assembly, and an air duct is connected to one side of the spray tower.

[0008] As a preferred embodiment of the above technical solution, the spray assembly includes a collection tank, a circulating pump, a delivery pipe, a guide box, a storage ring, spray heads, and swirl vanes. The collection tank is located on the bottom inner wall of the spray tower, and an annular groove is formed on the outer surface of the collection tank. The circulating pump is located on one side of the collection tank, and the delivery pipe is connected to one side of the circulating pump. The delivery pipe is connected to the storage ring through the guide box. The guide box is fixed in the middle of the inner wall of the spray tower and is cylindrical. The storage ring is fixed above the inner wall of the guide box. The spray heads are evenly distributed in a ring array on the inner diameter of the storage ring. The swirl vanes are located on the inner wall of the guide box and are spiral in shape.

[0009] As a preferred embodiment of the above technical solution, the circulation assembly includes dust sieve holes, impurity filter plates, a box cover, a condenser coil, and a drain pipe. The dust sieve holes are arranged in a ring on the bottom surface of the guide box. The impurity filter plates are fixed to the bottom of the guide box, and the positions of the impurity filter plates correspond to the upper dust sieve holes and the lower box cover, respectively. The box cover is fixed to the top surface of the collection box, and the top surface of the box cover has a grid structure. The condenser coil is adapted to the annular groove outside the collection box, and the drain pipe is connected to the lower side of the collection box.

[0010] As a preferred embodiment of the above technical solution, a demister is installed above the air guide box, and the demister is in the shape of a ring.

[0011] As a preferred embodiment of the above technical solution, the spray tower is connected to the absorption tower through an air intake pipe, and an induced draft fan is installed inside the air intake pipe.

[0012] As a preferred embodiment of the above technical solution, the inner wall of the absorption tower is provided with an activated carbon adsorption mesh, a molecular sieve, and a silica gel mesh, with the molecular sieve located between the activated carbon adsorption mesh and the silica gel mesh. The absorption tower is connected to an exhaust pipe via a blower located on one side below.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The circulating pump of this utility model transports the absorbent liquid from the collection tank to the storage ring, and sprays it out through the ring spray head. The gas to be treated enters from the air inlet pipe and forms a swirling flow through the swirl blades in the guide box, which prolongs the gas-liquid contact time and enhances the mass transfer efficiency through turbulent mixing. This allows the pollutants to fully contact the absorbent liquid and be absorbed efficiently. The absorbent liquid falls back to the collection tank and is recycled.

[0015] 2. When the spray tower is running, the absorbent liquid after spraying is initially filtered through the dust sieve holes at the bottom of the guide box, then finely filtered through the impurity filter plate, flows into the collection tank and is cooled by the condenser coil, and finally pumped back for reuse by the circulation pump, so as to realize the recycling of the absorbent liquid. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional cross-sectional structure of the spray tower.

[0017] Figure 2 A schematic diagram of the overall three-dimensional structure of a nitrogen monoxide production tail gas treatment device;

[0018] Figure 3 A front sectional view of the nitric oxide production tail gas treatment unit;

[0019] Figure 4 for Figure 1 A magnified structural diagram at point P.

[0020] Legend:

[0021] 1. Spray tower; 101. Inlet pipe; 2. Absorption tower; 201. Exhaust fan 2; 202. Exhaust pipe; 21. Activated carbon adsorption mesh; 22. Molecular sieve; 23. Silica gel mesh; 3. Spray assembly; 301. Liquid collection tank; 302. Circulation pump; 303. Liquid delivery pipe; 304. Flow guide box; 305. Liquid storage ring; 306. Spray head; 307. Swirl blades; 31. Circulation assembly; 3101. Dust sieve holes; 3102. Impurity filter plate; 3103. Tank cover; 3104. Condensate coil; 3105. Drain pipe; 4. Demister; 5. Exhaust pipe; 51. Exhaust fan 1. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] Please see Figures 1-4 As shown, this utility model provides a technical solution: a nitrogen monoxide production tail gas treatment device, including a spray tower 1 and an absorption tower 2. The absorption tower 2 is located on one side of the spray tower 1. An air inlet pipe 101 is connected to the lower side of the spray tower 1. The spray tower 1 is equipped with a spray assembly 3 and a circulation assembly 31 connected to the spray assembly 3. A demister 4 is installed at the upper end of the spray assembly 3. An air duct 5 is connected to one side of the spray tower 1.

[0024] As one implementation method in this embodiment, please refer to Figures 2-4As shown, the spray assembly 3 includes a collection tank 301, a circulating pump 302, a delivery pipe 303, a guide box 304, a storage ring 305, spray heads 306, and swirl vanes 307. The collection tank 301 is located on the bottom surface of the inner wall of the spray tower 1. An annular groove is formed on the outer surface of the collection tank 301. The circulating pump 302 is located on one side of the collection tank 301. The delivery pipe 303 is connected to one side of the circulating pump 302. The delivery pipe 303 is connected to the guide box 304 and the storage ring 305 through the guide box 304. The guide box 304 is fixed in the middle of the inner wall of the spray tower 1 and is cylindrical. The storage ring 305 is fixed on the upper part of the inner wall of the guide box 304. The spray heads 306 are evenly distributed in a ring array on the inner diameter of the storage ring 305. The swirl vanes 307 are located on the inner wall of the guide box 304 and are spiral in shape.

[0025] Furthermore, when the spray tower 1 is running, the circulating pump 302 draws absorbent from the collection tank 301 and delivers it to the storage ring 305 through the delivery pipe 303. The absorbent forms pressure in the storage ring 305 and is evenly sprayed into the guide box 304 through the annular array of spray heads 306, forming fine atomized droplets. At the same time, the gas to be treated enters from the bottom of the spray tower 1 through the inlet pipe 101 and flows upward through the guide box 304, interacting with the dust sieve holes 310 on the bottom surface of the guide box 304. 1. Further contact and interception of larger dust particles. Subsequently, the gas encounters the spiral swirl blades 307 to form a rotating upward airflow. The swirl structure not only prolongs the gas residence time, but also enhances the turbulent mixing effect, allowing the pollutants to fully contact the absorbent and be efficiently absorbed. The absorbed liquid after spraying falls back to the bottom of the guide box 304 and re-enters the circulation through the collection box 301. Through continuous droplet spraying and swirl enhancement, the spray assembly 3 achieves efficient circulation of gas purification.

[0026] As one implementation method in this embodiment, please refer to Figures 2-4 As shown, the circulation component 31 includes a dust sieve hole 3101, an impurity filter plate 3102, a box cover 3103, a condenser coil 3104, and a drain pipe 3105. The dust sieve hole 3101 is arranged in a ring on the bottom surface of the flow guide box 304. The impurity filter plate 3102 is fixed below the flow guide box 304. The positions of the impurity filter plate 3102 correspond to the upper dust sieve hole 3101 and the lower box cover 3103, respectively. The box cover 3103 is fixed to the top surface of the liquid collection box 301. The top surface of the box cover 3103 has a grid structure. The condenser coil 3104 is adapted to the annular groove outside the liquid collection box 301. The drain pipe 3105 is connected to the lower side of the liquid collection box 301.

[0027] Furthermore, when the spray tower 1 is running, the absorbed liquid, carrying the absorbed pollutants and dust particles, flows out from the dust sieve holes 3101 on the bottom surface of the guide box 304. The dust sieve holes 3101 intercept larger dust particles again, achieving preliminary filtration. Subsequently, the absorbed liquid continues to flow downwards and undergoes deep purification through the impurity filter plate 3102. The impurity filter plate 3102, utilizing its microporous structure, further removes fine impurities, suspended solids, and any possible crystals from the absorbed liquid, ensuring the cleanliness of the absorbed liquid. After two stages of filtration, the absorbed liquid flows into the collection tank through the grid structure of the tank cover 3103. 301. At this point, the temperature of the absorbent rises due to the exothermic reaction during the absorption process. The condenser coil 3104, through close contact with the outer wall of the collection tank 301, transfers the heat of the absorbent to the cooling medium, thereby lowering the temperature of the absorbent to a suitable operating range. Therefore, the absorbent is cooled by the condenser coil 3104. Finally, the cooled clean absorbent is pumped back to the delivery pipe 303 and the storage ring 305 by the circulation pump 302 for use. After a period of use, the absorbent is discharged from the collection tank 301 through the drain pipe 3105, realizing the recycling of the absorbent and reducing resource waste and operating costs.

[0028] As one implementation method in this embodiment, please refer to Figures 1-2 As shown, the inner wall of the absorption tower 2 is provided with activated carbon adsorption mesh 21, molecular sieve 22 and silica gel mesh 23. Molecular sieve 22 is located in the middle of activated carbon adsorption mesh 21 and silica gel mesh 23. The absorption tower 2 is connected to the exhaust pipe 202 through the induced draft fan 201 on one side below.

[0029] Furthermore, the second induced draft fan 201 is located at the bottom side of the absorption tower 2. Through negative pressure, the gas is made to pass evenly through the activated carbon adsorption net 21, the molecular sieve 22, and the silica gel net 23. The gas containing pollutants first passes through the activated carbon adsorption net 21 to remove organic pollutants, then the molecular sieve 22 intercepts large-diameter molecules and adsorbs polar substances, and finally the silica gel net 23 adsorbs residual moisture and trace amounts of polar impurities through hydrogen bonds. The purified gas is drawn to the exhaust pipe 202 by the second induced draft fan 201 and discharged. The three-stage adsorption mechanism realizes the fine purification of the gas.

[0030] Working principle: The induced draft fan 51 draws the gas to be treated into the spray tower 1 through the inlet pipe 101. At the same time, the circulating pump 302 draws the absorbent liquid from the collection tank 301, atomizes it through the annular spray head 306, and when the gas enters the guide box 304 through the inlet pipe 101, it forms a swirling flow through the swirl vanes 307, ensuring that the pollutants are fully contacted with the absorbent liquid and efficiently absorbed. During operation, the absorbent liquid undergoes primary filtration through the dust sieve 3101 and fine filtration through the impurity filter plate 3102. After being cooled by the condenser coil 3104, it is reused through the circulating pump 302. The drain pipe 3105... Waste liquid is discharged periodically to achieve recycling. When the purified gas rises from the guide box 304 into the demister 4, the demister 4 removes the liquid droplets carried in the purified gas in the spray tower 1, preventing the liquid droplets from being discharged with the exhaust gas and causing secondary pollution or equipment corrosion. Subsequently, the purified gas rises above the spray tower 1 through the operation of the first induced draft fan 51 and enters the absorption tower 2 through the gas induced draft pipe 5. The second induced draft fan 201 is located on the bottom side of the absorption tower 2. The negative pressure causes the gas to pass through the activated carbon adsorption net 21, molecular sieve 22, and silica gel net 23 in sequence. After three-stage adsorption purification, it is discharged through the exhaust pipe 202.

[0031] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A nitrogen monoxide production tail gas treatment device, comprising a spray tower (1) and an absorption tower (2), wherein the absorption tower (2) is located on one side of the spray tower (1), characterized in that: An air inlet pipe (101) is connected to the lower side of one side of the spray tower (1). The spray tower (1) is equipped with a spray assembly (3) and a circulation assembly (31) connected to the spray assembly (3). A demister (4) is installed at the upper end of the spray assembly (3). An air duct (5) is connected to one side of the spray tower (1). The spray assembly (3) includes a collection tank (301), a circulating pump (302), a delivery pipe (303), a guide box (304), a storage ring (305), a spray head (306), and swirl vanes (307). The collection tank (301) is located on the bottom inner wall of the spray tower (1), and an annular groove is formed on the outer surface of the collection tank (301). The circulating pump (302) is located on one side of the collection tank (301), and the delivery pipe (303) is connected to one side of the circulating pump (302). The pipe (303) is connected to the flow guide box (304) and the liquid storage ring (305) through the flow guide box (304). The flow guide box (304) is fixed in the middle of the inner wall of the spray tower (1). The flow guide box (304) is cylindrical. The liquid storage ring (305) is fixed above the inner wall of the flow guide box (304). The spray heads (306) are evenly distributed in a ring array on the inner diameter of the liquid storage ring (305). The swirl blades (307) are set on the inner wall of the flow guide box (304). The swirl blades (307) are spiral in shape.

2. The nitric oxide production tail gas treatment device according to claim 1, characterized in that: The circulation component (31) includes a dust sieve (3101), an impurity filter plate (3102), a box cover (3103), a condenser coil (3104), and a drain pipe (3105). The dust sieve (3101) is arranged in a ring on the bottom surface of the guide box (304). The impurity filter plate (3102) is fixed below the guide box (304). The impurity filter plate (3102) corresponds to the positions of the upper dust sieve (3101) and the lower box cover (3103). The box cover (3103) is fixed to the top surface of the collection box (301). The top surface of the box cover (3103) has a grid structure. The condenser coil (3104) is adapted to the annular groove outside the collection box (301). The drain pipe (3105) is connected to the lower side of the collection box (301).

3. The nitric oxide production tail gas treatment device according to claim 1, characterized in that: A demister (4) is installed above the flow guide box (304), and the demister (4) is in the shape of a ring.

4. The nitric oxide production tail gas treatment device according to claim 1, characterized in that: The spray tower (1) is connected to the absorption tower (2) through the air intake pipe (5), and the air intake pipe (5) is equipped with an induced draft fan (51).

5. The nitric oxide production tail gas treatment device according to claim 1, characterized in that: The inner wall of the absorption tower (2) is provided with an activated carbon adsorption mesh (21), a molecular sieve (22), and a silica gel mesh (23). The molecular sieve (22) is located between the activated carbon adsorption mesh (21) and the silica gel mesh (23). The absorption tower (2) is connected by a blower (201) and an exhaust pipe (202) on one side below.

Images