Desulfurization and dust removal equipment for preparing sodium pyrosulfite

Abstract

The invention relates to the technical field of processing of sodium pyrosulfite, in particular to desulfurization and dust removal equipment for preparing sodium pyrosulfite, which comprises an absorption tower, a drying mechanism and a dust removal bag, the absorption tower comprises a tower body which is hollow inside and comprises a plurality of absorption areas, a spraying mechanism for spraying alkali liquor into the tower body, a driving mechanism for driving the spraying mechanism to rotate, and a reciprocating execution mechanism for driving the spraying mechanism to reciprocate up and down; in the process that waste gas is introduced into the absorption tower and circulates from top to bottom, the driving mechanism and the reciprocating executing mechanism achieve desulfurization operation of synchronous multi-stage rotation and up-down reciprocating motion through the arranged multiple absorption areas, and therefore the problem that the existing desulfurization effect is poor is solved.

Description

Technical Field

[0001] The invention relates to the technical field of sodium pyrosulfite processing, in particular to desulfurization and dust removal equipment for preparing sodium pyrosulfite. Background Art

[0002] In the process of preparing sodium metabisulfite, waste gas containing sulfur dioxide is generated. In order to protect the environment and meet emission standards, these waste gases need to be desulfurized and dusted.

[0003] Wet desulfurization is one of the most widely used desulfurization methods at present, mainly including alkaline solution absorption method. The principle is to use alkaline solution to absorb sulfur dioxide in the exhaust gas to generate sulfite or sulfate. It mainly uses absorption tower, spray system and circulating pump and other equipment to pass the exhaust gas into the absorption tower. At the same time, the spray system sprays alkaline solution into the absorption tower to contact and react with the exhaust gas, thereby achieving the purpose of removing sulfur dioxide. This method has high absorption efficiency and the by-products can be recycled.

[0004] However, the current desulfurization and dust removal equipment still has the following defects: 1. From the time the exhaust gas enters the absorption tower to the time it is discharged from the absorption tower, the exhaust gas has only one opportunity to contact with the alkali solution. Not only is the contact time short, but the contact area is small. Therefore, the desulfurization effect is poor; 2. After the exhaust gas enters the absorption tower, it is quickly discharged from the exhaust pipe, which reduces the residence time of the exhaust gas in the absorption tower, thereby reducing the opportunity for it to fully contact with the alkali solution, further resulting in poor desulfurization effect; 3. When the exhaust gas after desulfurization is discharged, it will be accompanied by a certain amount of water vapor, which will directly enter the dust removal bag for dust removal, which will affect the dust removal effect and affect the dust removal bag, affecting its subsequent use. Summary of the invention

[0005] Technical problem to be solved: The present invention provides a desulfurization and dust removal equipment for the preparation of sodium metabisulfite, which can solve the above-mentioned problems.

[0006] Technical solution: In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a desulfurization and dust removal equipment for the preparation of sodium metabisulfite, including an absorption tower, wherein the absorption tower includes a hollow tower body, a plurality of spraying mechanisms for spraying alkali solution into the tower body to absorb sulfur dioxide in the exhaust gas introduced, a driving mechanism for driving the spraying mechanism to rotate, and a reciprocating actuator for driving the spraying mechanism to reciprocate up and down.

[0007] Partition plates are evenly arranged in the tower body from top to bottom, and the space in the tower body is divided into multiple absorption zones by the partition plates; the upper side surface of the lower wall of each absorption zone is an inclined surface arranged in the left and right directions, and the inclined directions of the upper and lower adjacent inclined surfaces are opposite; an air hole for facilitating the flow of exhaust gas is opened at the higher end of each inclined surface; square holes for the outflow of alkali solution are evenly opened on the left and right sides of the tower body corresponding to the upper and lower ends of each inclined surface, and the front and rear sides of the left and right inner walls of the tower body corresponding to the square holes are inclined structures; a gas blocking member for preventing exhaust gas from passing into the outside from the square holes is arranged in the square hole.

[0008] A spray collection tank for collecting alkali solution is also provided under the tower body, and collection holes are provided on the left and right sides of the spray collection tank, and the collection holes are connected to the square holes on the corresponding sides through a first pipe; a straight pipe extending into the spray collection tank is provided on the bottom wall of the tower body below the air hole, and the bottom end of the pipe is close to the inner bottom wall of the spray collection tank; an air inlet pipe is provided on the rear side of the uppermost absorption area; and an air outlet pipe is provided above the right side wall of the spray collection tank.

[0009] A water outlet is provided on the rear side of the spray collection tank, a filter screen is provided at the water outlet, and the water outlet is connected to each spray mechanism through a second pipeline provided with a water pump. A water inlet pipe and a water outlet pipe are also provided on the spray collection tank.

[0010] As a preferred technical solution of the present invention, the air blocking member includes an air blocking shaft rotatably mounted in the middle of the square hole, and arc-shaped fan blades are circumferentially arranged on the circumferential side walls of the air blocking shaft.

[0011] As a preferred technical solution of the present invention, the tower body also includes folded plates vertically arranged in each absorption zone, multiple folded plates are evenly arranged front and back in the same absorption zone, and the front and rear adjacent folded plates are spaced apart from each other to form an S-shaped gas flow path.

[0012] As a preferred technical solution of the present invention, the tower body also includes a rotating shaft, and the upper and lower ends of the rotating shaft and the connection between the middle part and each partition plate are installed through bearings. The upper end of the rotating shaft passes through the upper wall of the tower body and is connected to a driving mechanism; a spray mechanism corresponding to each absorption zone is fixedly installed on the rotating shaft, and circular grooves are provided on the lower side surface of the tower body top and the bottom surface of each partition plate, and the spray mechanism is arranged in the circular groove.

[0013] As a preferred technical solution of the present invention, the spray mechanism is composed of a plurality of annular pipes distributed from the inside to the outside, the annular pipes are connected by connecting rods, adjacent annular pipes are interconnected, and spray heads are evenly arranged at the bottom of each annular pipe; the apertures of the spray heads on the corresponding annular pipes on each spray mechanism distributed from top to bottom gradually decrease, and the number of spray heads gradually decreases.

[0014] As a preferred technical solution of the present invention, a reciprocating actuator corresponding to the absorption zone is arranged between the right side surface of the tower body and the rotating shaft; the reciprocating actuator includes a rectangular long plate fixedly mounted on the outer wall of the rotating shaft, the right side of the rectangular long plate extends out of the right side wall of the tower body, and a rectangular groove for allowing the rectangular long plate to pass through is opened on the right side wall of the tower body, the front and rear sides of the rectangular long plate are sealed and slidably connected with the front and rear walls of the rectangular groove, and a foldable anti-leakage cloth is installed between the upper side surface of the rectangular long plate and the upper bottom wall of the rectangular groove, as well as between the lower side surface of the rectangular long plate and the lower bottom wall of the rectangular groove to prevent exhaust gas from leaking from the rectangular groove.

[0015] As a preferred technical solution of the present invention, a rotating shaft is installed on the right side surface of the tower body corresponding to the position of each absorption zone, and rotates evenly from top to bottom. Pulleys and cams are arranged on the rotating shaft in sequence from the end close to the tower body to the end away from the tower body, wherein the pulleys are connected by belts, and the cam cooperates with one end of the rectangular long plate located outside the tower body, and the side of the rectangular long plate that cooperates with the cam is an arc-shaped structure; the rotating shaft in any reciprocating actuator is connected to an external driving device.

[0016] As a preferred technical solution of the present invention, the rotating shaft is composed of an axis one located in the middle and an axis two and an axis three elastically and telescopically connected to the upper and lower ends of the axis one, and the axis one can only slide axially and cannot rotate; the upper and lower ends of the axis one respectively penetrate the top wall of the tower body and the lowest partition plate, the axis two is fixedly connected to the output shaft of the driving mechanism, and the axis three is rotatably connected to the bottom wall of the tower body; the spray mechanism is fixedly installed on the axis one.

[0017] As a preferred technical solution of the present invention, it also includes a drying device and a dust removal bag. The absorption tower, the drying device and the dust removal bag are all provided with an air inlet pipe and an air outlet pipe. The air outlet pipe of the absorption tower and the air inlet pipe of the drying device, as well as the air outlet pipe of the drying device and the air inlet pipe of the dust removal bag are all connected by pipes.

[0018] The present invention has the following beneficial effects:

[0019] 1. The desulfurization and dust removal equipment for preparing sodium pyrosulfite of the present invention enables the spray mechanism to reciprocate up and down while rotating through the arranged driving mechanism and reciprocating actuator, thereby causing the movement trajectory of the alkali solution to change continuously, thereby increasing the contact area with sulfur dioxide and ensuring the desulfurization effect.

[0020] 2. The desulfurization and dust removal equipment for preparing sodium metabisulfite of the present invention divides the tower body into multiple absorption zones from top to bottom through the partition plate, and passes the waste gas discharged from the last absorption zone into the spray collection tank for re-absorption, thereby increasing the contact opportunity between the waste gas and the alkali solution and further improving the desulfurization effect.

[0021] 3. The desulfurization and dust removal equipment for preparing sodium metabisulfite of the present invention allows the exhaust gas to flow in each absorption zone in an S-shaped path through the folding plates arranged in each absorption zone, which greatly increases the circulation time in the absorption zone, further increases the contact time with the alkali solution, and improves the desulfurization effect.

[0022] 4. The desulfurization and dust removal equipment for preparing sodium metabisulfite of the present invention is provided with a drying device so that the waste gas with water vapor after desulfurization is dried before entering the dust removal bag, thereby avoiding affecting the use of the dust removal bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure from the first viewing angle of the present invention.

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of the interior of the absorption tower of the present invention from a first perspective.

[0026] Figure 3 It is a schematic diagram of the internal three-dimensional structure from a first-view perspective of the absorption tower of the present invention after the folding plate is removed.

[0027] Figure 4 It is a schematic diagram of the internal three-dimensional structure from a second perspective of the absorption tower of the present invention after the folding plate is removed.

[0028] Figure 5 The present invention Figure 3 Enlarged view of point A in the middle.

[0029] Figure 6 It is a cross-sectional view of the front view of the present invention.

[0030] Figure 7 The present invention Figure 6 Cross-sectional view of BB.

[0031] Figure 8 The present invention Figure 6 Cross-sectional view of CC.

[0032] Fig. 9 is a cross-sectional view of the gas barrier of the present invention.

[0033] In the figure: 1. absorption tower; 2. drying equipment; 3. dust bag; 11. tower body; 12. spray mechanism; 13. driving motor; 14. reciprocating actuator; 15. spray collecting trough; 111. partition plate; 1111. air hole; 112. square hole; 113. folding plate; 114. rotating shaft; 151. collecting hole; 152. straight pipe; 1121. air blocking shaft; 1122. arc-shaped fan blade; 121. annular pipe; 141. rectangular long plate; 142. pulley; 143. cam. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] See also Figure 1 A desulfurization and dust removal equipment for preparing sodium metabisulfite comprises an absorption tower 1, a drying device 2 and a dust removal bag 3. The absorption tower 1, the drying device 2 and the dust removal bag 3 are all provided with an air inlet pipe and an air outlet pipe. The air outlet pipe of the absorption tower 1 and the air inlet pipe of the drying device 2, as well as the air outlet pipe of the drying device 2 and the air inlet pipe of the dust removal bag 3 are all connected by pipelines. During specific operation, the waste gas generated in the preparation process of sodium metabisulfite first enters the absorption tower 1 to absorb sulfur dioxide gas, then enters the drying device 2 for drying treatment, and finally passes through the dust removal bag 3 to remove impurities such as dust.

[0036] See also Figure 1 and Figure 2 The absorption tower 1 includes a tower body 11 with a hollow interior, a plurality of spraying mechanisms 12 for spraying alkali solution into the tower body 11 to absorb sulfur dioxide in the exhaust gas introduced therein, a driving motor 13 for driving the spraying mechanism 12 to rotate, and a reciprocating actuator 14 for driving the spraying mechanism 12 to reciprocate up and down.

[0037] See also Figure 2 , Figure 3 , Figure 6 and Figure 7 , partition plates 111 are evenly arranged from top to bottom in the tower body 11, and the space in the tower body 11 is divided into multiple absorption zones by the partition plates 111; the partition plates 111 and the upper side surfaces of the bottom wall of the tower body 11 are inclined surfaces arranged in the left and right directions, so that the alkali solution can flow to one side and out of the tower body 11 after falling on the partition plates 111, and the inclined directions of the upper and lower adjacent inclined surfaces are opposite; an air hole 1111 is provided at the higher end of each inclined surface for facilitating the flow of exhaust gas; square holes 112 for the outflow of alkali solution are evenly provided on the left and right sides of the tower body 11 corresponding to the upper and lower ends of each inclined surface; a gas blocking member for preventing exhaust gas from passing into the outside from the square hole 112 is provided in the square hole 112.

[0038] See also Fig. 9The gas blocking component includes a gas blocking shaft 1121 rotatably installed in the middle of the square hole 112, and the circumferential side wall of the gas blocking shaft 1121 is circumferentially provided with arc-shaped fan blades 1122; during desulfurization operation, some exhaust gas may overflow from the square hole 112. By setting the gas blocking component, when the alkali solution flows out of the square hole 112, the arc-shaped fan blades 1122 are pushed to rotate, and the rotation of the arc-shaped fan blades 1122 generates an airflow blowing toward the inside of the tower body 11, which can prevent the exhaust gas from overflowing from here to a certain extent, thereby playing a role in gas blocking.

[0039] See also Figure 2 , Figure 4 , Figure 6 and Figure 7 A spray collection tank 15 for collecting alkali solution is also provided below the tower body 11, and collecting holes 151 are provided on the left and right sides of the spray collection tank 15, and the collecting holes 151 are connected to the square holes 112 on the corresponding sides through a first pipe; a straight pipe 152 extending into the spray collection tank 15 is provided on the bottom wall of the tower body 11 below the air hole 1111, and the bottom end of the straight pipe 152 is close to the inner bottom wall of the spray collection tank 15; an air inlet pipe is provided on the rear side of the uppermost absorption zone; and an air outlet pipe is provided above the right side wall of the spray collection tank 15.

[0040] See also Figure 6 and Figure 8 The spray collection tank 15 has a water outlet at the rear side, a filter screen (not shown in the figure) is arranged at the water outlet, and the water outlet is connected to each spray mechanism 12 through a second pipe provided with a water pump (not shown in the figure). The spray collection tank 15 also has a water inlet pipe and a water outlet pipe (not shown in the figure).

[0041] During specific operation, alkali solution is introduced into the spray collection tank 15 through the provided water inlet pipe, and then the exhaust gas is introduced into the tower body 11 through the air inlet pipe, and enters the spray collection tank 15 through the air holes 1111 from top to bottom in turn, and is finally discharged through the air outlet pipe of the spray collection tank 15; at the same time, the alkali solution is sprayed out through the spray mechanism 12, contacts and reacts with the exhaust gas diffused in the tower body 11, and falls on the partition plate 111, and flows out through the square hole 112 under the action of the inclined surface, and enters the spray collection tank 15 through the pipeline between the square hole 112 and the collection hole 151. The alkali solution entering the spray collection tank 15 is filtered under the action of the water pump and circulated into each spray mechanism 12 for recycling; the waste alkali solution is discharged through the water outlet pipe, thereby realizing the replacement of the alkali solution.

[0042] See also Figure 2 , Figure 7 and Figure 8The tower body 11 also includes a folded plate 113 vertically arranged in each absorption zone. A plurality of folded plates 113 are evenly arranged in the front and rear of the same absorption zone, and the front and rear adjacent folded plates 113 are staggered left and right to form an S-shaped gas flow path, which increases the flow time of the exhaust gas in each absorption zone, and then increases the contact time with the spraying alkali solution, thereby improving the absorption effect of sulfur dioxide; the square hole 112 is located between the two folded plates 113.

[0043] See also Figure 2 and Figure 3 The tower body 11 also includes a rotating shaft 114. The upper and lower ends of the rotating shaft 114 and the connection between the middle part and each partition plate 111 are installed through bearings. The upper end of the rotating shaft 114 passes through the upper wall of the tower body 11 and is connected to the driving motor 13; a spray mechanism 12 corresponding to each absorption zone is fixedly installed on the rotating shaft 114, and a circular groove is opened on the lower side surface of the top of the tower body 11 and the bottom surface of each partition plate 111, and the spray mechanism 12 is rotatably set in the circular groove.

[0044] During specific operation, the driving motor 13 drives the rotating shaft 114 to rotate, and the rotating shaft 114 drives the multiple spraying mechanisms 12 to rotate, thereby realizing rotary spraying in each absorption zone, increasing the spraying area, and further improving the removal effect of sulfur dioxide.

[0045] Continue reading Figure 2 and Figure 3 The spray mechanism 12 is composed of a plurality of annular pipes 121 distributed from the inside to the outside, each annular pipe 121 is connected by a connecting rod, adjacent annular pipes 121 are interconnected, and spray heads are evenly provided at the bottom of each annular pipe 121; under the action of a water pump, the alkali solution in the spray collection tank 15 first enters the outermost annular pipe 121 through the second pipe, and then enters the inner annular pipes 121 in turn, and finally is sprayed into the tower body 11 through the spray head to contact with the exhaust gas for reaction.

[0046] The aperture of the spray head on the corresponding annular pipe 121 on each spray mechanism 12 distributed from top to bottom gradually decreases, and the number of spray heads gradually decreases; in the process of exhaust gas flowing from top to bottom, the amount of unabsorbed sulfur dioxide in each absorption zone gradually decreases. The present invention adjusts the spray volume by setting the spray head to have a gradually decreasing aperture and a gradually decreasing number, thereby ensuring that the alkali solution spray volume in the absorption zone distributed from top to bottom gradually decreases to adapt to the change in the amount of sulfur dioxide, thereby avoiding excessive extraction of alkali solution when not much alkali solution is needed, causing excessive workload on the pump.

[0047] See also Figure 3-Figure 5A reciprocating actuator 14 corresponding to the absorption zone is arranged between the right side of the tower body 11 and the rotating shaft 114; the reciprocating actuator 14 includes a rectangular long plate 141 rotatably sleeved on the outer wall of the rotating shaft 114, the right side of the rectangular long plate 141 extends out of the right side wall of the tower body 11, and a rectangular groove for the rectangular long plate 141 to pass through is opened on the right side wall of the tower body 11, the front and rear sides of the rectangular long plate 141 are sealed and slidably connected with the front and rear walls of the rectangular groove, and a foldable anti-leakage cloth is installed between the upper side of the rectangular long plate 141 and the upper bottom wall of the rectangular groove, and between the lower side of the rectangular long plate 141 and the lower bottom wall of the rectangular groove to prevent exhaust gas from leaking from the rectangular groove.

[0048] A rotating shaft is installed on the right side surface of the tower body 11 at positions corresponding to each absorption zone, and rotates evenly from top to bottom. Pulleys 142 and cams 143 are arranged on the rotating shaft in sequence from the end close to the tower body 11 to the end away from the tower body 11, wherein the pulleys 142 are connected by belts, and the cam 143 cooperates with one end of the rectangular long plate 141 located outside the tower body 11, and the side of the rectangular long plate 141 that cooperates with the cam 143 is an arc-shaped structure; the rotating shaft in any reciprocating actuator 14 is connected to an external driving device such as a motor.

[0049] The rotating shaft 114 consists of a shaft 1 located in the middle and a shaft 2 and a shaft 3 elastically and telescopically connected to the upper and lower ends of the shaft 1 respectively. The shaft 1 and the shaft 2 and the shaft 3 can only slide axially and cannot rotate; the upper and lower ends of the shaft 1 respectively penetrate the top wall of the tower body 11 and the lowest partition plate 111, the shaft 2 is fixedly connected to the output shaft of the driving motor 13, and the shaft 3 is rotatably connected to the bottom wall of the tower body 11; the spray mechanism 12 is fixedly installed on the shaft 1.

[0050] During specific operation, the rotating shaft connected to it is driven to rotate through an external driving device, and the rotating shaft drives the pulley 142 and the cam 143 thereon to rotate synchronously. While the pulley 142 rotates, the rotating shafts at other positions are driven to rotate synchronously through the belt, thereby realizing the synchronous movement of all cams 143. Since the position states of the cams 143 are completely consistent, the multiple cams 143 drive shaft one to move downward by synchronously acting on the corresponding rectangular long plate 141. When the cam 143 is no longer in contact with the rectangular long plate 141, it is reset under the elastic telescopic connection between shaft one and shaft two and shaft three, thereby realizing the up and down reciprocating motion of shaft one. The up and down reciprocating motion of shaft one drives the spray mechanism 12 to move synchronously. During the up and down reciprocating motion of the spray mechanism 12, the spraying trajectory of the alkali solution changes in real time, thereby being able to change the spraying range of the alkali solution, increase the contact area with the exhaust gas, and improve the removal effect of sulfur dioxide.

[0051] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A desulfurization and dust removal device for preparing sodium metabisulfite, comprising an absorption tower (1), characterized in that: The absorption tower (1) comprises a tower body (11) with a hollow interior, a plurality of spray mechanisms (12) for spraying alkali solution into the tower body (11) to absorb sulfur dioxide in the introduced exhaust gas, a drive motor (13) for driving the spray mechanisms (12) to rotate, and a reciprocating actuator (14) for driving the spray mechanisms (12) to reciprocate up and down; The tower body (11) is evenly provided with partition plates (111) from top to bottom, and the space inside the tower body (11) is divided into a plurality of absorption zones by the partition plates (111); the upper side surface of the lower wall of each absorption zone is an inclined surface arranged in the left-right direction, and the inclined directions of the upper and lower adjacent inclined surfaces are opposite; the higher end of each inclined surface is provided with an air hole (1111) for convenient exhaust gas circulation; square holes (112) for alkali solution to flow out are evenly provided on the left and right sides of the tower body (11) corresponding to the upper and lower ends of each inclined surface; and a gas blocking member for preventing exhaust gas from passing into the outside through the square hole (112) is provided in the square hole (112); A spray collection tank (15) for collecting alkali solution is also provided below the tower body (11), and collection holes (151) are provided on the left and right sides of the spray collection tank (15), and the collection holes (151) are connected to the square holes (112) on the corresponding sides through a first pipe; a straight pipe (152) extending into the spray collection tank (15) is provided on the bottom wall of the tower body (11) below the air hole (1111), and the bottom end of the straight pipe (152) is close to the inner bottom wall of the spray collection tank (15); an air inlet pipe is provided on the rear side of the uppermost absorption zone; and an air outlet pipe is provided above the right side wall of the spray collection tank (15); A water outlet is provided on the rear side of the spray collection tank (15), a filter screen is provided at the water outlet, and the water outlet is connected to each spray mechanism (12) via a second pipeline provided with a water pump; a water inlet pipe and a water outlet pipe are also provided on the spray collection tank (15).

2. A desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 1, characterized in that: The air blocking member comprises an air blocking shaft (1121) rotatably mounted in the middle of the square hole (112), and arc-shaped fan blades (1122) are circumferentially arranged on the circumferential side wall of the air blocking shaft (1121).

3. A desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 1, characterized in that: The tower body (11) further comprises folded plates (113) vertically arranged in each absorption zone, a plurality of folded plates (113) are evenly arranged front and back in the same absorption zone, and the front and back adjacent folded plates (113) are staggeredly distributed left and right to form an S-shaped gas flow path.

4. A desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 1, characterized in that: The tower body (11) further comprises a rotating shaft (114), the upper and lower ends of the rotating shaft (114) and the connection between the middle part and each partition plate (111) are all mounted via bearings, the upper end of the rotating shaft (114) passes through the upper wall of the tower body (11) and is connected to a driving motor (13); a spray mechanism (12) corresponding to each absorption zone is fixedly mounted on the rotating shaft (114), a circular groove is provided on the lower side surface of the top of the tower body (11) and the bottom surface of each partition plate (111), and the spray mechanism (12) is rotatably arranged in the circular groove.

5. The desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 1, characterized in that: The spray mechanism (12) is composed of a plurality of annular pipes (121) distributed from the inside to the outside, the annular pipes (121) are connected by connecting rods, adjacent annular pipes (121) are interconnected, and spray heads are evenly arranged at the bottom of each annular pipe (121).

6. A desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 5, characterized in that: The apertures of the spray heads on the corresponding annular pipes (121) on the spray mechanisms (12) distributed from top to bottom gradually decrease, and the number of the spray heads gradually decreases.

7. A desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 4, characterized in that: A reciprocating actuator (14) corresponding to each absorption zone is arranged between the right side of the tower body (11) and the rotating shaft (114); the reciprocating actuator (14) comprises a rectangular long plate (141) rotatably sleeved on the outer wall of the rotating shaft (114); the right side of the rectangular long plate (141) extends out of the right side wall of the tower body (11); a rectangular groove for allowing the rectangular long plate (141) to pass through is opened on the right side wall of the tower body (11); the front and rear sides of the rectangular long plate (141) are sealed and slidably connected to the front and rear walls of the rectangular groove; and a foldable anti-leakage cloth for preventing exhaust gas from leaking from the rectangular groove is installed between the upper side of the rectangular long plate (141) and the upper bottom wall of the rectangular groove, and between the lower side of the rectangular long plate (141) and the lower bottom wall of the rectangular groove.

8. A desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 7, characterized in that: A rotating shaft is evenly mounted on the right side surface of the tower body (11) at positions corresponding to each absorption zone, and is rotatably mounted from top to bottom. A pulley (142) and a cam (143) are arranged on the rotating shaft in sequence from an end close to the tower body (11) to an end away from the tower body (11), wherein the pulleys (142) are connected by belts, and the cam (143) cooperates with an end of a rectangular long plate (141) located outside the tower body (11), and a side of the rectangular long plate (141) that cooperates with the cam (143) is an arc-shaped structure; and the rotating shaft in any reciprocating actuator (14) is connected to an external driving device.

9. A desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 8, characterized in that: The rotating shaft (114) is composed of a shaft 1 located in the middle, and a shaft 2 and a shaft 3 elastically and telescopically connected to the upper and lower ends of the shaft 1, respectively. The shaft 1 and the shaft 2 and the shaft 3 can only slide axially and cannot rotate. The upper and lower ends of the shaft 1 respectively penetrate the top wall of the tower body (11) and the lowest partition plate (111), the shaft 2 is fixedly connected to the output shaft of the driving motor (13), and the shaft 3 is rotatably connected to the bottom wall of the tower body (11); the spray mechanism (12) is fixedly mounted on the shaft 1.

10. The desulfurization and dust removal equipment for preparing sodium metabisulfite according to claim 1, characterized in that: It also comprises a drying device (2) and a dust removal bag (3); the absorption tower (1), the drying device (2) and the dust removal bag (3) are all provided with an air inlet pipe and an air outlet pipe; the air outlet pipe of the absorption tower (1) and the air inlet pipe of the drying device (2) as well as the air outlet pipe of the drying device (2) and the air inlet pipe of the dust removal bag (3) are all connected via pipelines.

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