A waste gas dust removal and purification device for phosphorus pentachloride production

Abstract

The application discloses a waste gas dust reduction and purification device for phosphorus pentachloride production, which comprises a box body with a closed inner cavity, a semi-cylindrical inner shell with an opening downward and eccentric rotation installed in the inner cavity, and an air inlet pipe fixed in the inner cavity below the inner shell; wherein the inner wall top of the inner shell is provided with a spraying cavity and a plurality of spraying heads communicated with the spraying cavity; a liquid distribution pipe is installed in the spraying cavity and communicated with a liquid supply device outside the box body; a sealing plate for sealing the spraying cavity is hinged above the spraying cavity, and a blocking rod for pressing on the sealing plate is fixed on the inner wall of the box body. The inner shell is arranged in eccentric rotation and automatically opened and closed in cooperation with the sealing plate; when the inner shell is horizontal, waste gas is closed and gathered below the inner shell, stays for a long time and can fully contact with the sprayed reaction solvent; after the inner shell rotates, the sealing plate is automatically opened by the pressure in the cavity, the purified waste gas reversely passes through the spraying head, forms secondary reverse washing and realizes washing of the spraying head at the same time.

Description

Technical Field

[0001] This invention relates to the field of phosphorus pentachloride technology, specifically to a dust reduction and purification device for waste gas used in phosphorus pentachloride production. Background Technology

[0002] Phosphorus pentachloride is a crucial raw material in the field of new energy materials. Industrially, it is primarily produced on a large scale using a synthesis process involving the chlorination of phosphorus trichloride and chlorine. This production process continuously generates a large amount of process waste gas, which is complex in composition, mainly containing particulate matter, unreacted chlorine gas, and acidic hydrogen chloride gas. Currently, phosphorus pentachloride production enterprises commonly employ traditional baghouse dust collectors, fixed tower spray scrubbers, and multi-stage water washing + alkaline washing combinations to treat process waste gas. However, these methods still have some shortcomings in practical industrial applications.

[0003] Spray purification equipment often adopts a fixed cavity structure. After the exhaust gas enters the equipment, the airflow distribution is chaotic and the residence time is uncontrollable, resulting in insufficient gas-liquid contact in some areas. At the same time, during long-term operation of the fixed spray structure, the spray head is easily blocked by dust and crystallized impurities, requiring shutdown for cleaning and maintenance, which affects the operating efficiency of the production line. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, this invention provides a dust reduction and purification device for waste gas in phosphorus pentachloride production.

[0005] This invention adopts the following technical solution: a dust reduction and purification device for waste gas in phosphorus pentachloride production, comprising: The box has a closed inner cavity; the inner cavity is used to fill the reaction solvent; A semi-cylindrical inner shell is eccentrically and rotatably mounted inside the cavity of the box; the inner shell is arranged with its opening facing downwards and is submerged in the reaction solvent; A drive unit, fixed to one side of the housing, is used to drive the inner housing to rotate; The air intake pipe is fixed in the inner cavity below the inner housing; The inner shell has a spraying chamber and multiple spray heads communicating with the spraying chamber at the top of its inner wall. The spraying chamber is equipped with a liquid distribution pipe, which is connected to a liquid supply device on the outside of the tank. A sealing plate for sealing the spraying chamber is hinged above the spraying chamber, and a stop bar for pressing on the sealing plate is fixed on the inner wall of the box.

[0006] Preferably, the inner shell includes an arc-shaped plate and semi-circular plates fixed at both ends of the arc-shaped plate; the semi-circular plates on both sides are rotatably mounted on the inner wall of the box via a rotating shaft and bearings at their eccentric positions, wherein the rotating shaft on one side is fixedly connected to the driving device; The inner wall of the box is fixed with a stop block for limiting the rotation angle of the semi-circular plate.

[0007] Preferably, the arc-shaped plate has a downwardly protruding arc-shaped convex plate at the middle position of its top; The sealing plate is arc-shaped, with one side of each end of the sealing plate hinged to the semi-circular plates on both sides; when the lower end face of the arc-shaped plate is horizontal, the sealing plate is aligned with the convex plate and is coaxial with the arc-shaped plate, forming a sealed spraying cavity between the sealing plate and the convex plate.

[0008] Preferably, the spray head is inserted through the convex plate; multiple rows of spray heads are arranged along the axial direction of the convex plate, and the spray heads in each row are evenly distributed along the arc surface of the convex plate.

[0009] Preferably, the two ends of the liquid distribution pipe are fixed to the semi-circular plates on both sides, one end of the liquid distribution pipe passes through the semi-circular plate and is connected to a hose, and the other end of the hose passes through the box near the rotating shaft and is connected to the liquid supply device. The center lines of the exit points of the rotating shaft, liquid distribution pipe, and hose on the housing are on the same plane.

[0010] Preferably, when the lower end face of the arc-shaped plate is horizontal, the air intake pipe coincides with the axis of the arc-shaped plate; One end of the air intake pipe extends out of the housing and is connected to the air source to be treated. Above the air intake pipe, there is an air guide plate fixed to the semi-circular plates at both ends. The two side plates of the air guide plate are arranged in a conical shape, and the sides of the two side plates are inclined.

[0011] Preferably, multiple layers of inclined dispersion sieve plates are fixed in the inner cavity above the inner shell; Above the dispersing sieve plate is a gas collecting chamber integrated with the box body. A baffle assembly is installed in the gas collecting chamber, and an exhaust pipe is connected to the upper side of the gas collecting chamber.

[0012] Preferably, the dispersing screen plate is stamped with uniform through grooves, and a stamped baffle is connected to one side of the through grooves.

[0013] Preferably, the gas collecting chamber is a long, narrow channel, with sealing doors installed at both ends; The baffle assembly includes baffle blocks closely arranged in the gas collection chamber, and baffle slots that run vertically through the baffle blocks; the baffle blocks are slidably installed along the gas collection chamber and clamped by sealing doors on both sides.

[0014] Preferably, a raised connecting cavity is provided above the gas collecting cavity, and the connecting cavity is connected to the baffle groove of the baffle block in the middle position; the exhaust pipe is opposite to the connecting cavity.

[0015] The beneficial effects of this invention are as follows: The inner shell adopts an eccentric rotating design, which, together with the sealing plate, enables automatic opening and closing. The two inner shells work alternately, allowing for segmented and sealed reactions of the exhaust gas, resulting in more thorough purification. When the inner shell is horizontal, the exhaust gas is sealed and accumulates in the sealed space below the inner shell, resulting in a longer residence time and full contact with the sprayed reaction solvent. This enhances the absorption and sedimentation of phosphorus pentachloride dust and acidic harmful substances, improving dust reduction and purification efficiency. When the inner shell rotates and tilts, the sealing plate automatically opens due to the internal pressure of the cavity. The purified exhaust gas then passes through the spray head in the opposite direction and is discharged upwards. During the discharge process, the gas passes through the spray liquid film twice, forming a secondary reverse washing process. This process further traps unsettled fine dust in the exhaust gas, reducing the dust content of the tail gas, and simultaneously flushing the spray head, solving the problem of spray head clogging after prolonged operation. Multi-layer inclined dispersion screens enhance gas-liquid mixing. As the airflow rises and passes through the matrix channel, it is cut and diverted. The impact baffles further break up the airflow, increasing the specific surface area of ​​gas-liquid contact, thereby reducing the dust content in the exhaust gas and improving the compliance rate of waste gas purification. The baffle blocks de-mist effectively remove mist and prevent droplets from being carried into the rear exhaust pipe, reducing solvent loss. The baffle blocks can be replaced online, and the pre-sealed baffle blocks at both ends ensure no waste gas leakage during the replacement process, improving the overall uptime of the equipment and ensuring continuous operation of the production line. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This invention provides a three-dimensional dust suppression and purification device for waste gas in phosphorus pentachloride production. Figure 1 .

[0018] Figure 2 This invention provides a three-dimensional dust suppression and purification device for waste gas in phosphorus pentachloride production. Figure 2 (Part of the side panel is hidden in the picture).

[0019] Figure 3 for Figure 2 The main view in the middle.

[0020] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0021] Figure 5 for Figure 3 BB section view.

[0022] Figure 6 This is a three-dimensional view of the inner shell.

[0023] Figure 7 This is a 3D view of the air guide plate.

[0024] Figure 8 This is a three-dimensional view of the dispersing sieve plate.

[0025] Explanation of reference numerals in the attached figures: 1. Housing; 11. Inner cavity; 12. Gas collection cavity; 121. Connecting cavity; 2. Inner shell; 201. Spray chamber; 21. Arc plate; 211. Convex plate; 22. Semicircular plate; 221. Rotating shaft; 23. Spray head; 24. Sealing plate; 25. Baffle bar; 26. Baffle block; 3. Liquid distribution pipe; 31. Flexible hose; 4. Drive unit; 5. Intake pipe; 51. Air guide plate; 6. Dispersion sieve plate; 601. Through groove; 61. Baffle bar; 7. Baffle block; 71. Baffle channel; 8. Exhaust pipe. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. It should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the component or element referred to must have a specific orientation.

[0027] Example 1: like Figures 1 to 3 As shown, the present invention provides a dust suppression and purification device for waste gas in phosphorus pentachloride production, comprising a box 1 with a closed inner cavity 11, wherein at least one inner shell 2 is installed in the box 1; in this embodiment, two symmetrically arranged inner shells 2 are installed in the box 1. The inner cavity 11 is filled with a reaction solvent for treating waste gas, and the reaction solvent completely submerges the inner shell 2.

[0028] Combination Figures 2 to 6As shown, the inner shell 2 includes an arc-shaped plate 21 and semi-circular plates 22 welded and fixed to both ends of the arc-shaped plate 21, forming a semi-enclosed structure with the opening facing downwards. Rotating shafts 221 are fixed to the semi-circular plates 22 on both sides, and the rotating shafts 221 are rotatably mounted on the side wall of the housing 1 via bearings. Furthermore, the rotating shafts 221 are eccentrically arranged, that is, the rotating shafts 221 are located at a position offset from the center of the semi-circular plates 22, with one side of the rotating shaft 221 connected to a drive device 4. The drive device 4 is a geared motor fixed to the side wall of the housing 1, used to control the rotation of the entire inner shell 2 around the rotating shaft 221. Stops 26 are fixed on the inner wall of the housing 1 to limit the rotation angle of the semi-circular plates 22, such as… Figure 4 As shown, the left stop 26 is closer to the pivot 221 and is used to keep the lower end face of the inner housing 2 horizontal; the right stop 26 is further away from the pivot 221 and is used to keep the right side of the lower end face of the inner housing 2 rotated downward by a certain angle.

[0029] The top center of the arc-shaped plate 21 has a downwardly protruding arc-shaped convex plate 211; an arc-shaped sealing plate 24 is provided at the upper opening of the convex plate 211, with one side of each end of the sealing plate 24 hinged to the two semi-circular plates 22 on both sides. When the sealing plate 24 and the convex plate 211 are in relative contact, the upper end of the convex plate 211 can be completely sealed, forming a spray chamber 201; and at this time, the sealing plate 24 and the arc-shaped plate 21 are coaxial, that is, the sealing plate 24 and the arc-shaped plate 21 form a smooth semi-circular arc surface. A circular stop bar 25 is provided above the sealing plate 24, and the two ends of the stop bar 25 are fixedly or rotatably connected to the inner wall of the housing 1. Figure 4 As shown, when the lower end face of the inner shell 2 is horizontal, the circular stop bar 25 presses against the highest position of the sealing plate 24, so that the sealing plate 24 completely seals the protrusion 211, and the exhaust gas can be collected in the inner shell 2; when the geared motor controls the inner shell 2 to rotate clockwise by a certain angle, the sealing plate 24 will move down by a certain distance, so that the sealing plate 24 can rotate around the hinge point, thereby opening the upper side of the spray chamber 201, and the purified exhaust gas passes back through the spray head 23 and rises from the sealing plate 24.

[0030] Combination Figure 3 , Figure 4As shown, multiple rows of spray heads 23 are arranged axially along the convex plate 211. The spray holes of the spray heads 23 connect the spray chamber 201 and the inner cavity 11. The spray heads 23 in each row are evenly distributed along the arc surface of the convex plate 211, so that the spray heads 23 can cover the internal space of the inner shell 2. A liquid distribution pipe 3 is installed in the spray chamber 201. Small holes are opened on the circumference of the liquid distribution pipe 3. Both ends of the liquid distribution pipe 3 are fixed to the semicircular plates 22 on both sides. One end of the liquid distribution pipe 3 passes through the semicircular plate 22 and is connected to a flexible hose 31. The flexible hose 31 extends obliquely downward for a certain distance and then passes out from the side wall of the box 1 and is connected to the liquid supply device. In this embodiment, the center lines of the exit points of the rotating shaft 221, the liquid distribution pipe 3, and the hose 31 on the housing 1 are on the same plane. The hose 31 exits near the rotating shaft 221, which reduces the swaying amplitude of the hose 31 when it exits with the inner housing 2, thereby improving the stability and service life of the hose 31. In this embodiment, the liquid supply device is used to provide reaction solvent at a certain pressure. The liquid supply device can also actively extract reaction solvent from the housing 1, on the one hand to realize the circulation of reaction solvent and ensure that the reaction solvent reacts fully, and on the other hand to control the liquid level of reaction solvent in the housing 1.

[0031] Combination Figures 5 to 7 As shown, the air intake pipe 5 is located in the inner cavity 11 below the inner shell 2; when the lower end face of the arc-shaped plate 21 is horizontal, the air intake pipe 5 coincides with the axis of the arc-shaped plate 21. Small holes are opened on the circumference of the air intake pipe 5, and one end of the air intake pipe 5 passes through the housing 1 and connects to the air source to be treated. An air guide plate 51 is provided above the air intake pipe 5, and both ends of the air guide plate 51 are fixed to the semi-circular plates 22 at both ends. The air guide plate 51, fixed to the semi-circular plates 22 at both ends, includes plates bent on both sides, with the lower sides of the two side plates forming a conical surface. Figure 7 As shown, the sides of both plates of the air guide plate 51 are beveled to facilitate greater dispersion of the airflow on both sides. The airflow then gathers upward into the inner cavity 11 below the inner shell 2, where it reacts with the reaction solvent sprayed from the spray head 23 to achieve exhaust gas purification.

[0032] Example 2: Based on the above embodiment one, combined with Figures 2 to 5 ,as well as Figure 8 As shown, a multi-layered dispersing sieve plate 6 is fixed in the inner cavity 11 above the inner shell 2. The dispersing sieve plate 6 is an inclined plane, and a matrix of through grooves 601 are stamped on the dispersing sieve plate 6. One end of the stamped part is connected to one side of the through groove 601 to form a baffle 61. During operation, the gas sprayed from the spray chamber 201 at the upper end of the inner shell 2 rises to the dispersing sieve plate 6 and flows out of each through groove 601 in the dispersing sieve plate 6 for dispersion. After passing through the through grooves 601, the airflow impacts the baffle 61 and is further dispersed, so that the gas and the reaction solvent can be more fully mixed and reacted, thereby improving the quality of waste gas purification treatment.

[0033] Combination Figure 2 , Figure 3 and Figure 5 As shown, the upper end of the housing 1 has an integral gas collecting chamber 12, which is located above the dispersing sieve plate 6. The gas collecting chamber 12 is a long, narrow channel with open ends, and the lower side of the long, narrow channel is connected to the inner cavity 11 of the housing 1. The upper part of the long, narrow channel has a protruding connecting cavity 121, and an exhaust pipe 8 is installed on the upper side of the connecting cavity 121. The two ends of the long, narrow channel are hinged with sealing doors, and a locking device is installed between the sealing doors and the housing 1.

[0034] Multiple baffle blocks 7 are slidably installed in the gas collecting chamber 12, closely arranged and clamped by the sealing doors on both sides. Each baffle block 7 has a vertically penetrating baffle groove 71 with a bent structure. When airflow passes through the baffle groove 71, it impacts the side wall of the groove and bends, thus intercepting mist and droplets. The connecting cavity 121 above the gas collecting chamber 12 communicates with the baffle groove 71 of the baffle block 7 in the middle position. At least one baffle block 7 at each end of the gas collecting chamber 12 does not participate in operation, serving only a sealing function. This facilitates online replacement of the baffle blocks 7. For example, when the inner shell 2 does not release gas, the baffle blocks 7 are essentially inactive. At this time, the sealing doors on both sides are opened, a new baffle block 7 is added from one side and pushed inward, while the baffle block 7 on the other side is pushed out for cleaning. Then the sealing doors on both sides are closed. This process is repeated to allow for the timely replacement of the baffle blocks 7 one by one.

[0035] Working principle: The inner shells 2 and the air intake pipes 5 on both sides work alternately. Taking the inner shells 2 and the air intake pipes 5 on one side as an example, the following explanation is provided. The inner shell 2 is initially horizontal and filled with a slow-reaction solvent. The inlet pipe 5 introduces the cooled exhaust gas into the lower part of the inner shell 2. The exhaust gas rises and passes through the guide plate 51, converging from both sides towards the lower part of the inner shell 2. The liquid supply device pumps a certain pressure of reaction solvent into the liquid distribution pipe 3 through the hose 31. The reaction solvent gathers in the spray chamber 201 and is sprayed into the lower inner cavity 11 through the spray head 23, reacting with the exhaust gas gathered in the inner cavity 11. After a certain amount of exhaust gas has gathered in the inner shell 2, the inlet pipe 5 switches to supply gas to the other side of the inner shell 2. After a certain period of time, the exhaust gas in the inner shell 2 undergoes sufficient reaction and purification, such as Figure 3 and Figure 4 As shown in the figure, the geared motor controls the inner housing 2 to rotate clockwise by a certain angle. The internal pressure of the spray chamber 201 pushes the sealing plate 24 to rotate and open. The purified exhaust gas passes back through the spray head 23 and rises from the sealing plate 24. The rising gas is dispersed by the multi-layer dispersion sieve plate 6 and comes into full contact with the reaction solvent, further purifying the gas and improving the quality of exhaust gas treatment. The purified gas continues to rise and passes through the baffle block 7 for demisting, and is discharged through the exhaust pipe 8. Finally, the inner shell 2 closes again; the intake pipe 5 then switches the exhaust gas back, thus realizing the alternating operation of the two inner shells 2.

[0036] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. Obviously, those skilled in the art can make various modifications and variations to the invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A dust suppression and purification device for waste gas from phosphorus pentachloride production, characterized in that, include: The box has a closed inner cavity; the inner cavity is used to fill the reaction solvent; A semi-cylindrical inner shell is eccentrically and rotatably installed inside the box body; The inner shell is arranged with its opening facing downwards and is submerged in the reaction solvent; A drive unit, fixed to one side of the housing, is used to drive the inner housing to rotate; The air intake pipe is fixed in the inner cavity below the inner housing; The inner shell has a spraying chamber and multiple spray heads communicating with the spraying chamber at the top of its inner wall. The spraying chamber is equipped with a liquid distribution pipe, which is connected to a liquid supply device on the outside of the tank. A sealing plate for sealing the spraying chamber is hinged above the spraying chamber, and a stop bar for pressing on the sealing plate is fixed on the inner wall of the box.

2. The waste gas dust reduction and purification device for phosphorus pentachloride production according to claim 1, characterized in that: The inner shell includes an arc-shaped plate and semi-circular plates fixed at both ends of the arc-shaped plate; the semi-circular plates on both sides are rotatably mounted on the inner wall of the box via a rotating shaft and bearings at their eccentric positions, and the rotating shaft on one side is fixedly connected to the drive device. The inner wall of the box is fixed with a stop block for limiting the rotation angle of the semi-circular plate.

3. The waste gas dust reduction and purification device for phosphorus pentachloride production according to claim 2, characterized in that: The top center of the arc-shaped plate has a downward-protruding arc-shaped protrusion. The sealing plate is arc-shaped, with both ends hinged to the semi-circular plates on both sides; when the lower end face of the arc-shaped plate is horizontal, the sealing plate is aligned with the convex plate and coaxial with the arc-shaped plate, forming a sealed spraying cavity between the sealing plate and the convex plate.

4. The waste gas dust reduction and purification device for phosphorus pentachloride production according to claim 3, characterized in that: The spray head is inserted through the convex plate; multiple rows of spray heads are arranged along the axial direction of the convex plate, and the spray heads in each row are evenly distributed along the arc surface of the convex plate.

5. The waste gas dust reduction and purification device for phosphorus pentachloride production according to claim 2, characterized in that: The two ends of the liquid distribution pipe are fixed to the semicircular plates on both sides. One end of the liquid distribution pipe passes through the semicircular plate and is connected to a hose. The other end of the hose passes through the box near the rotating shaft and is connected to the liquid supply device. The center lines of the exit points of the rotating shaft, liquid distribution pipe, and hose on the housing are on the same plane.

6. The waste gas dust reduction and purification device for phosphorus pentachloride production according to claim 2, characterized in that: When the lower end face of the arc-shaped plate is horizontal, the air intake pipe coincides with the axis of the arc-shaped plate; One end of the air intake pipe extends out of the housing and is connected to the air source to be treated. Above the air intake pipe, there is an air guide plate fixed to the semi-circular plates at both ends. The two side plates of the air guide plate are arranged in a conical shape, and the sides of the two side plates are inclined.

7. The waste gas dust reduction and purification device for phosphorus pentachloride production according to claim 1, characterized in that: Multiple layers of inclined dispersion sieve plates are fixed in the inner cavity above the inner shell. Above the dispersing sieve plate is a gas collecting chamber integrated with the box body. A baffle assembly is installed in the gas collecting chamber, and an exhaust pipe is connected to the upper side of the gas collecting chamber.

8. The waste gas dust reduction and purification device for phosphorus pentachloride production according to claim 7, characterized in that: The dispersing screen plate is stamped with uniform through grooves, and a stamped baffle is connected to one side of the through grooves.

9. The waste gas dust reduction and purification device for phosphorus pentachloride production according to claim 7, characterized in that: The gas collecting chamber is a long, narrow channel, with sealing doors installed at both ends. The baffle assembly includes baffle blocks closely arranged in the gas collection chamber, and baffle slots that run vertically through the baffle blocks; the baffle blocks are slidably installed along the gas collection chamber and clamped by sealing doors on both sides.

10. A dust suppression and purification device for waste gas in phosphorus pentachloride production according to claim 9, characterized in that: A raised connecting cavity is provided above the gas collecting chamber, and the connecting cavity is connected to the baffle groove of the baffle block in the middle position; the exhaust pipe is opposite to the connecting cavity.

Images