CN110841401B - Exhaust gas treatment equipment - Google Patents

Abstract

The present disclosure provides an exhaust gas treatment apparatus, which includes a body, a filter screen, and a water spraying device. The body comprises a shell, and an air inlet and an air outlet which are respectively arranged at two opposite ends of the shell. The filter screen is arranged in the shell. The average thickness of the filter screen is 0.4 cm to 1.0 cm. The water spraying devices are arranged between the air inlet and the filter screen, wherein at least one water spraying device sprays water towards the filter screen so as to form a water film on the surface of the filter screen. The water film can effectively increase the removal efficiency of smaller particles and salt particles in the waste gas, and can greatly reduce the frequency of equipment maintenance.

Description

Exhaust gas treatment equipment

technical field

The present disclosure relates to an exhaust gas treatment device, in particular, to a wet-type exhaust gas treatment device.

Background technique

In industrial processes, a large amount of exhaust gas is inevitably generated. If a large amount of waste gas is directly discharged into the atmosphere without any purification treatment, it will have a huge impact on the ecosystem and human living environment. Therefore, exhaust gas treatment equipment must be actively developed to effectively remove harmful substances and particles in exhaust gas.

Conventional wet scrubbers (also known as scrubbers) are commonly used exhaust gas treatment equipment that utilizes liquids to remove particulates or harmful gases. The biggest advantage of wet scrubbers is that they can remove both particulate and gaseous pollutants. Although wet scrubbers can have high dust removal efficiency, however, wet scrubbers often have problems with too large pressure drop, high operating costs and wastewater treatment. Wet scrubbers are the most widely used waste gas treatment equipment for removing acid and alkali gases.

The dust removal principle of the conventional wet scrubber is to make dust particles contact with water droplets with a particle size of 50 μm to 500 μm to be collected, and then separate the water droplets containing particles from the exhaust gas by gravity, inertia or centrifugal force to achieve the purpose of dust removal. In general, wet scrubbers use three mechanisms to bring particles into contact with water droplets, namely inertial impact, direct entrapment, and Brownian motion. Inertial impact is an important collection mechanism for particles with an average particle size greater than 10 microns; direct interception is used to collect particles with a larger average particle size; particles with a smaller average particle size may contact water droplets due to Brownian motion, and then be captured. collect. Among the above mechanisms, direct interception can be easily achieved by ordinary dust collectors. For small particles that are difficult to remove, they must be collected by inertial impact and Brownian motion mechanisms. However, the conventional wet scrubber is not effective in removing particulates (PM2.5) with an average particle diameter of 2.5 microns or less.

A conventional wet scrubber for treating inorganic acid-base gas is a scrubber, which absorbs and transports solutes in the gas into the liquid through gas-liquid two-phase contact. Conventional and commonly used absorption washing devices include a spray column, a plate absorption tower and a packed tower, among which the packed tower is the most widely used. The conventional packed tower is a continuous operation equipment, and the washing liquid is usually recycled. In the long-term operation, the nozzle will be blocked due to the accumulation of particulate matter, and the pipe diameter will become smaller. Therefore, the packed tower must be regularly cleaned. maintenance to maintain its performance.

In view of this, there is an urgent need to provide an exhaust gas treatment device that can effectively remove particles with a smaller average particle size and reduce the frequency of device maintenance.

SUMMARY OF THE INVENTION

An aspect of the present disclosure is to provide an exhaust gas treatment device, which includes a main body, a filter screen, and a water spray device. The body includes a casing and an air inlet and an air outlet respectively arranged at opposite ends of the casing. In the direction from the intake port to the exhaust port, the intake port is involute and the exhaust port is tapered. The filter screen is arranged in the casing. The average thickness of the filter mesh is 0.4 cm to 1.0 cm. The water spraying device is arranged in the casing and is between the air inlet and the filter screen. At least one water spray device sprays water toward the filter screen.

Another aspect of the present disclosure is to provide an exhaust gas treatment device, which includes a main body, a filter screen, a filling layer, a demisting layer, and a water spray device. The body includes a casing, and air inlets and exhaust ports disposed at opposite ends of the casing. In the direction from the intake port to the exhaust port, the intake port is involute and the exhaust port is tapered. The filter screen is arranged in the casing. The average thickness of the filter mesh is 0.4 cm to 1.0 cm. The filling layer is arranged between the air inlet and the filter screen. The defogging layer is arranged in the casing. The water spraying device is arranged on one side wall of the casing and is between the air inlet and the filter screen. The water spray device sprays liquid towards the filling layer.

Description of drawings

Aspects of the present disclosure will be better understood from the following detailed description read in conjunction with the accompanying drawings. It should be noted that, as is standard practice in the industry, many features are not drawn to scale. In fact, the dimensions of many features can be arbitrarily scaled for clarity of discussion.

FIG. 1 is a schematic cross-sectional view illustrating an exhaust gas treatment apparatus according to an embodiment of the present disclosure;

2 is a schematic cross-sectional view illustrating an exhaust gas treatment apparatus according to another embodiment of the present disclosure;

3 is a schematic cross-sectional view illustrating an exhaust gas treatment apparatus according to an embodiment of the present disclosure.

Detailed ways

The following disclosure provides many different embodiments or illustrations for implementing various features of the invention. The specific illustrations of components and arrangements described below are for the purpose of simplifying the present disclosure. These are, of course, only examples and are not intended to be limiting. For example, a description that a first feature is formed on or over a second feature includes embodiments in which the first feature and the second feature are in direct contact, as well as embodiments where other features are formed between the first feature and the second feature, Embodiments such that the first feature and the second feature are not in direct contact. The dimensions of many features may be drawn at different scales for simplicity and clarity. In addition, the present disclosure repeats reference numerals and/or letters in various illustrations. This repetition is for simplicity and clarity and does not imply any relationship between the various embodiments and/or configurations discussed.

Furthermore, spatially relative terms, such as "below", "below", "below", "above", "above", etc., are used to facilitate the description of the elements or features depicted in the figures and Relationships to other elements or features. Spatially relative terms encompass different orientations of elements in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations). The order of the following operations can vary. One or more additional operations may be performed between or after the following operations, and one or more of the following operations may be undone.

The present disclosure provides an exhaust gas treatment equipment, which is provided with a layer of filter screen in a casing, and sprays water toward the filter screen through a water spray device, so that a water film is formed on the surface of the filter screen. The water film is used to make the pores on the surface of the filter screen smaller, so as to increase the adsorption efficiency of the filter screen for fine particles in the exhaust gas, especially for the better collection efficiency of salts. Furthermore, since the particles in the exhaust gas are blocked by the water film, and the liquid that adsorbs the particles continues to flow due to gravity sedimentation, the filter screen will not be blocked. Therefore, the present disclosure increases the removal efficiency of small particles and salt particles in the exhaust gas through the filter screen with a water film, and can greatly reduce the frequency of equipment maintenance.

Please refer to FIG. 1 , which is a schematic cross-sectional view of an exhaust gas treatment apparatus 100 according to an embodiment of the present disclosure. The exhaust gas treatment device 100 is arranged horizontally. The exhaust gas treatment equipment 100 includes a main body 110 , a filter screen 120 and a water spray device 130 . The body includes a casing 112 , an air inlet 114 and an air outlet 116 . The air inlet 114 and the air outlet 116 are respectively disposed at opposite ends of the casing 112 . Along the direction from the intake port 114 to the exhaust port 116 , the intake port 114 is gradually opened, and the exhaust port 116 is tapered, that is, the diameter of the casing 112 is larger than the intake port 114 and the exhaust port 116 , and the extreme ends of the intake port 114 and the exhaust port 116 are the places with the smallest pipe diameters. The filter screen 120 and the water spray device 130 are both disposed in the casing 112 , wherein the water spray device 130 is closer to the air inlet 114 than the filter screen 120 . It should be added that the filter screen 120 cannot be installed in the exhaust port 116. Since the diameter of the exhaust port 116 is small, the installation of the filter screen 120 may cause the pressure difference between the intake port and the exhaust port to increase significantly, and further Affects the performance of back-end connected extraction equipment.

Part of the water spraying device 130a sprays water toward the filter screen 120 in the direction 132, so that a water film is formed on the surface of the filter screen. In some embodiments, part of the water spray device 130b can be selectively arranged to spray the liquid in the opposite direction 134 of the water spray device 130a, which is mainly used to make the particles in the exhaust gas come into contact with the water droplets to be more easily captured . In some embodiments, the liquid sprayed by the water spray device 130 may include one of water, an acidic aqueous solution, an alkaline aqueous solution, or any combination thereof. The liquid of the water spray device 130 is selected according to the characteristics of the treated exhaust gas.

In some embodiments, the filter screen 120 is comprised of a non-woven screen. For example, the material of the non-woven filter mesh can be cotton, wool, hemp, silk, polyester, nylon, acrylic, rayon, orlon, cashmilon, pressure Acrylan, Toraylon, Exlan, Dynel, Veral, Polypropylene, etc. Generally speaking, a filter screen with a larger average pore size cannot capture smaller particles. However, if a filter screen with a smaller average pore size is used, the pressure difference during the operation of the exhaust gas treatment device 100 will be larger. The exhaust equipment connected at the back end of 100 consumes a lot of energy. In some embodiments, the filter mesh 120 is a non-woven primary filter mesh and/or an intermediate filter mesh with larger average pores, and the average thickness is 0.4 cm to 1.0 cm. In a specific example, the filter screen 120 is a 3M mineral-free vegetable melon cloth. When a water film is formed on the surface of the filter screen 120, the surface of the filter screen 120 can have smaller pores to capture smaller particles. Furthermore, in some embodiments, the waste gas contains salts generated in the process, and the filter screen 120 with a water film and the characteristics that the salts are easily soluble in water can be used to make the salt particles absorbed or captured by the water film, Thus, a large amount of white smoke is avoided from the chimney, thereby reducing the opacity.

In some embodiments, the exhaust gas treatment apparatus 100 may optionally provide a filling layer (not shown) in the casing 112 . The packing layer may be provided, for example, between the air inlet 114 and the water spray device 130 (or the water spray device 130b). In one embodiment, the filling layer includes a plurality of raschig rings. In a specific example, the Raschig rings of the filling layer may be filled in a manner such as random stacking. Due to the high surface area of Raschig rings, filling with multiple layers of Raschig rings helps to trap particulates and moisture in exhaust gases. The filling layer is mainly used to intercept medium-sized particles, and the medium-sized particles in the exhaust gas are mainly trapped by the filling layer due to inertial action. The filling layer can further increase the area of the Raschig ring for capturing particles by the liquid sprayed by the water spray device 130b. However, smaller particles (eg 1 micron to 2.5 microns) tend to flash past the fill layer without being trapped due to their small inertial effect.

In other embodiments, a defogging layer (not shown) can be selectively disposed in the casing 112 . The defogging layer can be disposed between the air inlet 114 and the filter screen 120 , and can also be disposed between the filter screen 120 and the exhaust port 116 . The defogging layer includes a plurality of Raschig rings and/or corrugated plates. Generally, the Raschig rings of the defogging layer are smaller than those of the filling layer. If the defogging layer is arranged between the filter screen 120 and the air inlet 114, the defogging layer can capture larger particles; Used to filter out the liquid in the exhaust gas.

In some embodiments, a drainage unit (not shown) can be selectively disposed under the main body 110 and communicated with the housing 112 . The liquid is drained from the exhaust gas treatment apparatus 100 through the drain unit. The discharged liquid can be recycled through the water quality and then returned to the sprinkler 130, or used for other applications.

In some embodiments, the exhaust gas treatment device 100 may be disposed between the back ends of all processes and the chimney, so that the exhaust gas generated by the process can be removed from the exhaust gas particles and salt particles before being discharged through the chimney. In other embodiments, the exhaust gas treatment equipment 100 can also be disposed at the rear end of each process, so as to reduce the frequency of cleaning the air duct.

Please refer to FIG. 2 , which is a schematic cross-sectional view of an exhaust gas treatment apparatus 200 according to another embodiment of the present disclosure. The exhaust gas treatment apparatus 200 has a similar configuration to the exhaust gas treatment apparatus 100, except that the exhaust gas treatment apparatus 200 is arranged vertically. The horizontal exhaust gas treatment equipment 100 or the vertical exhaust gas treatment equipment 200 can be selected according to requirements or space configuration.

The exhaust gas treatment equipment 200 includes a main body 210 , a filter screen 220 and a water spray device 230 . The body 210 includes a housing 212 , an air inlet 214 and an air outlet 216 at opposite ends of the housing 212 , respectively. Exhaust gas is blown from the air inlet 214 to the air outlet 216 from below to above. The intake port 214 gradually opens from bottom to top, while the exhaust port 216 tapers from bottom to top. Part of the water spray device 230 a sprays water toward the filter screen 220 in the direction 232 , so that a water film is formed on the surface of the filter screen 220 . In some embodiments, a portion of the water spraying device 230b may also be selectively configured to spray liquid toward the direction 234 . It should be noted that the filter screen 220 cannot be installed in the exhaust port 216. Since the diameter of the exhaust port 216 is small, the installation of the filter screen 220 may cause the pressure difference between the intake port and the exhaust port to increase significantly, and further Affects the performance of back-end connected extraction equipment.

In some embodiments, the filter screen 220 is comprised of a non-woven screen. For example, the material of the non-woven filter mesh can be cotton, wool, hemp, silk, polyester, nylon, acrylic, rayon, orlon, cashmilon, pressure Acrylan, Toraylon, Exlan, Dynel, Veral, Polypropylene, etc. Generally speaking, a filter screen with a larger average pore size cannot capture smaller particles. However, if a filter screen with a smaller average pore size is used, the pressure difference during the operation of the exhaust gas treatment device 200 will be larger. The energy consumption of the air extraction equipment connected to the upper end of the 200 is relatively large. In some embodiments, the filter mesh 220 is a non-woven primary filter mesh and/or an intermediate filter mesh with larger average pores, and its average thickness is 0.4 cm to 1.0 cm. In a specific example, the filter screen 220 is a 3M mineral-free vegetable melon cloth. When a water film is formed on the surface of the filter screen 220, the surface of the filter screen 220 can have smaller pores to capture smaller particles. Furthermore, in some embodiments, the filter screen 220 with a water film can absorb and remove salt particles, thereby preventing the chimney from emitting a large amount of white smoke, thereby reducing the opacity.

In some embodiments, the exhaust gas treatment apparatus 200 may optionally provide a filling layer (not shown) in the casing 212 . The filling layer may be provided, for example, under the water spray device 230 (or the water spray device 230b). In one embodiment, the fill layer includes a plurality of Raschig rings. In a specific example, the Raschig rings of the filling layer may be filled in a manner such as random stacking. Due to the high surface area of Raschig rings, filling with multiple layers of Raschig rings helps to trap particulates and moisture in exhaust gases. The filling layer is mainly used to intercept medium-sized particles, and the medium-sized particles in the exhaust gas are mainly trapped by the filling layer due to inertial action. The filling layer can further increase the area of the Raschig ring for capturing particles by the liquid sprayed by the water spray device 230b. However, smaller particles (eg 1 micron to 2.5 microns) tend to flash past the fill layer without being trapped due to their small inertial effect.

In other embodiments, a defogging layer (not shown) can be selectively disposed in the casing 212 . The defogging layer can be arranged above the filter screen 220 or below the filter screen 220 . The defogging layer includes a plurality of Raschig rings and/or corrugated plates. Generally, the Raschig rings of the defogging layer are smaller than those of the filling layer. If the defogging layer is arranged under the filter screen 220, the defogging layer can capture larger particles; if the defogging layer is arranged above the filter screen 220, it is mainly used to filter out the liquid in the exhaust gas.

In some embodiments, the exhaust gas treatment apparatus 200 can also selectively set a drainage unit at the lower end of the air inlet 214 to discharge the flowing down liquid. The discharged liquid can be recycled through the water quality and then returned to the sprinkler 230, or used for other applications.

In some embodiments, the exhaust gas treatment equipment 200 may be disposed between the rear end of all processes and the chimney, so that the exhaust gas generated by the process can be removed from the exhaust gas particles and salt particles before being discharged through the chimney. In other embodiments, the exhaust gas treatment equipment 200 can also be disposed at the rear end of each process, so as to reduce the frequency of cleaning the air duct.

Please refer to FIG. 3 , which is a schematic cross-sectional view of an exhaust gas treatment apparatus 300 according to an embodiment of the present disclosure. In some embodiments, the exhaust gas treatment device 300 is positioned horizontally. The exhaust gas treatment equipment 300 includes a main body 310 , a filter screen 320 , a water spray device 330 , a filling layer 340 and a demisting layer 350 . The body 310 includes a housing 312 , an air inlet 314 and an air outlet 316 at opposite ends of the housing 312 , respectively. Along the direction from the intake port 314 to the exhaust port 316 , the intake port 314 is involute and the exhaust port 316 is tapered. The filter screen 320 , the water spray device 330 , the filling layer 340 and the defogging layer 350 are all disposed in the casing 312 . In some embodiments, a first filling layer 340a and a second filling layer 340b are respectively disposed on both sides of the first defogging layer 350a, wherein the second filling layer 340b is between the first defogging layer 350a and the second defogging layer 340b between layers 350b. In some embodiments, the filter screen 320 includes a first filter screen 320a and/or a second filter screen 320b, wherein the first filter screen 320a is disposed between the first filling layer 340a and the first defogging layer 350a, and the first filter screen 320a The two filter screens 320b are disposed between the second filling layer 340b and the second defogging layer 350b. However, the filter screen 320 can also be selectively disposed at any position of the housing 310, and the present disclosure is not limited thereto.

In some embodiments, both the filling layer 340 and the defogging layer 350 include a plurality of Raschig rings, wherein the defogging layer 350 may optionally include a corrugated board. Since the exhaust gas may contain acidic and alkaline particles or gases, and the exhaust gas may have high temperature, the material of the Raschig ring must be selected to be resistant to acid, alkali and high temperature. Both the filling layer 340 and the defogging layer 350 can include Raschig rings with any shape, such as a plum blossom, a double star, a sea urchin, a double cross, a crown, and any combination thereof, and can be filled in a manner such as random stacking . In one example, the packing density of the filling layer 340 is smaller than the packing density of the defogging layer 350, so as to intercept particles of different sizes.

In some embodiments, the filter screen 320 is comprised of a non-woven screen. For example, the material of the non-woven filter mesh can be cotton, wool, hemp, silk, polyester, nylon, acrylic, rayon, orlon, cashmilon, pressure Acrylan, Toraylon, Exlan, Dynel, Veral, Polypropylene, etc. Generally speaking, a filter screen with a larger average pore size cannot capture smaller particles. However, if a filter screen with a smaller average pore size is used, the pressure difference during the operation of the exhaust gas treatment equipment 300 will be larger. The energy consumption of the air extraction equipment connected to the upper end of the 300 is relatively large. In some embodiments, the filter mesh 320 is a non-woven primary filter mesh and/or an intermediate filter mesh with larger average pores, and its average thickness is 0.4 cm to 1.0 cm. In a specific example, the filter screen 320 is a 3M mineral-free vegetable melon cloth. When a water film is formed on the surface of the filter mesh 320, the surface of the filter mesh 320 can have smaller pores to capture smaller particles. Furthermore, in some embodiments, the filter screen 320 with a water film can absorb and remove salt particles, thereby preventing the chimney from emitting a large amount of white smoke, thereby reducing the opacity.

The water spray device 330 is disposed on the side wall of the casing 312 . In some embodiments, the first water spraying device 330a is disposed above the first filling layer 340a to spray liquid on the first filling layer 340a; the second water spraying device 330b is disposed above the second filling layer 340b to spray liquid on the first filling layer 340a The second filling layer 340b sprays liquid. In some embodiments, a third water spray device 330c can be selectively disposed above the second filter screen 320b to spray liquid on the second filter screen 320b to form a water film on the surface of the second filter screen 320b. It is added that even if the third water spray device 330c is not arranged above the second filter screen 320b, the liquid sprayed by the second water spray device 320b will be adsorbed to the second filter screen 320b along with the direction of the airflow, and A water film is formed on the second filter screen 320b. In some embodiments, the liquid sprayed by the water spray device 330 includes water, an acidic solution, an alkaline solution, and any combination thereof.

In some embodiments, the exhaust gas treatment equipment 300 may be disposed between the rear end of all processes and the chimney, so that the exhaust gas generated by the process can be removed from the exhaust gas particles and salt particles before being discharged through the chimney. In other embodiments, the exhaust gas treatment equipment 300 can also be disposed at the rear end of each process, so as to reduce the frequency of cleaning the air duct.

In some embodiments, the exhaust gas treatment device 300 may perform two-stage exhaust gas treatment, for example, the alkaline exhaust gas is treated first, and then the acidic exhaust gas is treated. The acidic solution is sprayed by the first water spray device 330a to wash and trap alkaline gas and particles by the first filling layer 340a. Then, the alkaline solution is sprayed by the second water spraying device 330b to wash and trap the acid gas and particles by the second filling layer 340b. Then, the salt particles generated by the neutralization of acid and alkali can be dissolved in the water sprayed by the third water spray device 330c, or captured by the water film on the surface of the filter screen 320, thereby avoiding the emission of a large amount of white smoke from the chimney, and Reduce the opacity.

The mist removal layer 350 can be used to capture larger particles in the exhaust gas, and can also be used to filter out liquid or moisture in the exhaust gas. The first defogging layer 350a disposed between the first filling layer 340a and the second filling layer 340b can filter out particles and liquids generated in the first filling layer 340a, and is disposed between the filter screen 320 and the exhaust port 316. The second demisting layer 350b in between is used to filter out excess body or water vapor, so as to prevent the exhaust gas from containing a large amount of liquid. The positions and numbers of the defogging layers 350 shown in FIG. 3 are only for illustrative purposes, and are not intended to limit the present disclosure. In fact, the exhaust gas treatment device 300 can be provided with any number of layers of the mist removal layer 350, and the mist removal layer 350 can be provided in any position of the housing 312, however, the mist removal layer 350 is not suitable to be provided at the air inlet 314 or the exhaust. In the air port 316, since the pipe diameter of the air inlet port 314 and the air outlet port 316 are small, when the defogging layer 350 is provided, the pressure difference between the air inlet port 314 and the air outlet port 316 will increase. In some embodiments, the defogging layer 350 may be disposed obliquely or vertically.

The water spray device 330 is disposed between the air inlet 314 and the filter screen 320, that is, the filter screen 320 is disposed below the water spray device 330 (eg, the third water spray device 330c) closest to the exhaust port 316, And spray water to the filter screen 320 through the water spray device 330 . In some embodiments, the filter screen 320 may be disposed obliquely or vertically, and the inclined configuration may allow the liquid sprayed by the water spray device 330 to be adsorbed on the surface of the filter screen 320 according to the direction of the air flow. It should be noted that the filter screen 320 cannot be installed in the exhaust port 316. Since the diameter of the exhaust port 316 is small, the installation of the filter screen 320 may cause a large pressure difference between the intake port 314 and the exhaust port 316. rise, which in turn affects the performance of the exhaust equipment connected at the back end.

In some embodiments, the exhaust gas treatment apparatus 300 can selectively dispose the drainage unit 360 below the body 310 and communicate with the housing 312 . Through the drainage unit 360, the liquid sprayed by the water spray device 330 is collected, and after the water quality is circulated, the liquid is returned to the water spray device 330, or used for other applications.

In one embodiment, the concentration of particles with a particle size larger than 10 microns in the exhaust gas at the intake port is 4400 μg/Nm ³ , and after passing through the exhaust gas treatment equipment of the present disclosure, the concentration at the exhaust port can be reduced to 1000 μg/Nm ³ ; The concentration of particles with a particle size of 2.5 to 10 microns in the exhaust gas can be reduced from 450 μg/Nm ³ to 150 μg/Nm ³ ; the concentration of particles with a particle size of 1 to 2.5 microns in the exhaust gas can be reduced from 750 μg/Nm ³ to 150 μg/Nm ³ ; The concentration of particles with a particle size of 0.1 μm to 1 μm in the exhaust gas can be reduced from 3400 μg/Nm ³ to 1100 μg/Nm ³ .

In other words, according to the concentration of the exhaust gas at the intake port and the exhaust port of the exhaust gas treatment equipment, the exhaust gas treatment equipment of the present disclosure can achieve a removal efficiency of 77% for particles with a particle size larger than 10 microns in the exhaust gas, and a particle size of 2.5 μm. The removal efficiency of particles from microns to 10 microns is about 67%, the removal efficiency of particles from 1 to 2.5 microns is about 80%, and the removal efficiency of particles from 0.1 to 1 micron can still reach 71%.

By applying the exhaust gas treatment equipment of the present disclosure, the water film formed on the surface of the filter screen can greatly remove salt particles with smaller particle size. Therefore, the emission of white smoke can be greatly reduced, thereby greatly reducing the opacity. Furthermore, the filter screen is not easily blocked by particles, so the frequency of equipment maintenance can be effectively reduced.

The various embodiments described provide many advantages over the prior art. It is to be understood that not all advantages are necessarily discussed here, that no advantages are applicable to all embodiments, and that other embodiments may provide different advantages.

According to some embodiments of the present disclosure, an exhaust gas treatment apparatus is provided. The exhaust gas treatment equipment includes a body, a filter screen and a water spray device. The body includes a casing and an air inlet and an air outlet respectively arranged at opposite ends of the casing. In the direction from the intake port to the exhaust port, the intake port is involute and the exhaust port is tapered. The filter screen is arranged in the casing. The average thickness of the filter mesh is 0.4 cm to 1.0 cm. The water spraying device is arranged in the casing and is between the air inlet and the filter screen, and at least one water spraying device sprays water toward the filter screen.

In some embodiments, the above-mentioned exhaust gas treatment equipment further includes a filling layer disposed in the casing, and the filling layer is between the water spray device and the air inlet.

In some embodiments, the above-mentioned exhaust gas treatment equipment further includes a mist removal layer disposed in the housing.

In some embodiments, the filter screen described above comprises a non-woven filter screen.

In some embodiments, the above-mentioned exhaust gas treatment equipment is arranged horizontally or vertically.

According to other embodiments of the present disclosure, an exhaust gas treatment apparatus is provided. The exhaust gas treatment equipment includes a body, a filter screen, a filling layer, a demisting layer and a water spray device. The body includes a casing, and air inlets and exhaust ports disposed at opposite ends of the casing. In the direction from the intake port to the exhaust port, the intake port is involute and the exhaust port is tapered. The filter screen is arranged in the casing. The average thickness of the filter mesh is 0.4 cm to 1.0 cm. The filling layer is arranged between the air inlet and the filter screen. The defogging layer is arranged in the casing. The water spraying device is arranged on one side wall of the casing and is between the air inlet and the filter screen, and the water spraying device sprays liquid toward the filling layer.

In some embodiments, the filter screen described above comprises a non-woven filter screen.

In some embodiments, the above-mentioned defogging layer and filter screen are arranged obliquely or vertically.

In some embodiments, the aforementioned liquids comprise water, acidic solutions, alkaline solutions, and any combination thereof.

In some embodiments, the above-mentioned filling layer and defogging layer respectively comprise a plurality of Raschig rings.

The foregoing summarizes the features of many embodiments so that those of ordinary skill in the art may better understand aspects of the present disclosure. Those of ordinary skill in the art should appreciate that using the present disclosure as a basis, other processes and structures can be devised or modified to achieve the same purposes and/or achieve the same advantages as the described embodiments. Those skilled in the art should also understand that the equivalent structure does not deviate from the spirit and scope of the present disclosure, and can make various changes, exchanges and substitutions without departing from the spirit and scope of the present disclosure.

Claims (9)

1. An exhaust gas treatment device, comprising:

the body comprises a shell, an air inlet and an air outlet, wherein the air inlet and the air outlet are respectively arranged at two opposite ends of the shell, and the air inlet is gradually opened and the air outlet is gradually reduced along the direction from the air inlet to the air outlet;

a filter screen disposed in the housing, wherein the filter screen is a non-woven filter screen, and an average thickness of the filter screen is 0.4 cm to 1.0 cm; and

and a plurality of water spraying devices arranged in the shell and between the air inlet and the filter screen, wherein the plurality of water spraying devices comprise a plurality of first water spraying devices arranged to spray water towards the filter screen so as to form a layer of water film on the surface of the filter screen, the plurality of water spraying devices comprise a plurality of second water spraying devices arranged to spray water towards the air inlet, and the plurality of first water spraying devices and the plurality of second water spraying devices are seen from the air inlet to the air outlet, and at least one of the plurality of first water spraying devices is positioned between two adjacent ones of the plurality of second water spraying devices.

2. The exhaust treatment device of claim 1, further comprising a plurality of packing layers disposed within the housing and between the plurality of water injection devices and the air inlet.

3. The exhaust gas treatment device of claim 1, further comprising a plurality of demisting layers disposed within the housing.

4. The exhaust gas treatment device of claim 1, wherein the exhaust gas treatment device is horizontally or vertically disposed.

5. An exhaust gas treatment device, comprising:

the body comprises a shell, an air inlet and an air outlet, wherein the air inlet and the air outlet are arranged at two opposite ends of the shell, and the air inlet is gradually opened and the air outlet is gradually reduced along the direction from the air inlet to the air outlet;

a first filter screen disposed within the housing, wherein an average thickness of the filter screen is 0.4 cm to 1.0 cm;

the first filling layers are arranged between the air inlet and the first filter screen;

the first defogging layer is arranged in the shell and is arranged between the exhaust port and the first filter screen;

a plurality of first water spraying devices arranged on one side wall of the shell, wherein the plurality of first water spraying devices are arranged between the air inlet and the first filter screen when viewed from top, and the plurality of first water spraying devices are arranged to spray a first liquid towards the plurality of first filling layers;

a second filter screen arranged in the shell and between the exhaust port and the first demisting layer;

the second filling layers are arranged in the shell and are arranged between the first defogging layers and the second filter screen;

the second defogging layer is arranged in the shell and is arranged between the air outlet and the second filter screen;

a plurality of second water spraying devices arranged on the side wall of the shell, wherein the plurality of second water spraying devices are arranged between the exhaust port and the first demisting layer when viewed from top, and the plurality of second water spraying devices are arranged to spray a second liquid towards the plurality of second filling layers; and

and the third water spraying device is arranged on the side wall of the shell, at least part of the third water spraying device is arranged between the plurality of second filling layers and the second filter screen when viewed from top, and the third water spraying device is arranged to directly spray a third liquid towards the second filter screen.

6. The exhaust gas treatment apparatus of claim 5, wherein the first filter and the second filter comprise nonwoven fabric filters.

7. The exhaust gas treatment apparatus according to claim 5, wherein the first demister layer, the second demister layer, the first filter and the second filter are disposed obliquely or vertically.

8. The exhaust gas treatment device of claim 5, wherein the first liquid, the second liquid, and the third liquid comprise water, an acidic solution, a basic solution, and any combination thereof.

9. The exhaust gas treatment device of claim 5, wherein the first packed beds, the second packed beds, the first demister layer, and the second demister layer each comprise a plurality of raschig rings.

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