Tail gas treatment device in phosphorus pentasulfide production process

Abstract

The utility model relates to a tail gas treatment device in a phosphorus pentasulfide production process, which effectively solves the problems of pipeline blockage and the like caused by easy accumulation of solid substances in a pipeline in a tail gas treatment process. Comprising a reaction kettle, a cooling pipe is arranged on the reaction kettle, a treatment box is arranged at the end, away from the reaction kettle, of the cooling pipe, a flue gas recovery tower is arranged on one side of the treatment box, the treatment box is connected with the flue gas recovery tower through a pipeline, a rotating shaft coaxially rotates in the treatment box, and flow guide fan blades are coaxially fixed to the rotating shaft; the tail gas treatment device is ingenious in structure and convenient to use, through the arrangement of the motor, the flow guide fan blades, the filter screen and the like, the motor drives the rotating shaft to rotate, the flow guide fan blades form large suction force, solid-phase matter or dust formed in the cooling pipe is sucked into the treatment box in an accelerated mode, and the staying time of tail gas in the cooling pipe is shortened; meanwhile, generated solid-phase objects can move towards the interior of the treatment box under the driving of large wind power, and pipeline blockage caused by excessive accumulation of the solid-phase objects is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment equipment, in particular to a tail gas treatment device in the production process of phosphorus pentasulfide. Background Art

[0002] Phosphorus pentasulfide is an inorganic compound with the chemical formula P2S5. It is a yellow solid that is stable when dry, but it hydrolyzes into phosphoric acid and hydrogen sulfide when it comes into contact with water, so there will be a smell of rotten eggs in the air.

[0003] The Chinese patent with application number CN202021366973.4 discloses a tail gas purification device for the production of phosphorus pentasulfide, including a purification kettle body and a water tank. The scale is a component made of transparent material, and the residual amount inside the purification kettle body can be observed by the scale. The mounting part is spirally connected to the air inlet of the through pipe through a screw groove, and the air inlet mechanism can be rotated to remove it from one end of the air inlet. The air outlet is distributed on the outer surface of the through pipe, which is convenient for fully merging the tail gas with the liquid, and the purification effect is good. The liquid enters the water tank through the water inlet pipe and can be filtered through the filter layer. The screen can prevent particles in the tail gas from clogging the water outlet pipe. The activated carbon layer can absorb harmful substances. The water pump sucks the liquid in the water tank to the nozzle, which is convenient for the reuse of the water liquid. The slider matches the slide rail, and the sliders are fixedly installed at both ends of the filter screen, that is, the filter screen can slide along the slide rail. The operator can open the maintenance door to replace the filter screen. The tail gas purified by the filter screen is purer and has a good use effect.

[0004] Existing tail gas absorption equipment for phosphorus pentasulfide generates sulfur vapor and hydrogen sulfide gas during the production process of phosphorus pentasulfide. When the tail gas enters the cooling pipe for cooling, phosphate and sulfide deposition will occur inside the pipe, causing pipe blockage. Utility Model Content

[0005] In view of the above problems, the present invention provides a tail gas treatment device for a phosphorus pentasulfide production process, which has the advantages of tail gas pretreatment and preventing blockage of pipelines in cooling pipes.

[0006] The technical solution is that the utility model comprises a reactor, a cooling pipe is arranged on the reactor, a treatment box is arranged at one end of the cooling pipe away from the reactor, a fume recovery tower is arranged on one side of the treatment box, and the treatment box is connected to the fume recovery tower through a pipeline;

[0007] A rotating shaft is coaxially rotated in the processing box, a guide blade is coaxially fixed on the rotating shaft, a filter screen is fixed on the right side of the guide blade in the processing box, a transmission bevel gear is coaxially fixed on the rotating shaft, a vertical shaft is rotatably connected to the processing box, a conduction bevel gear is coaxially fixed to one end of the vertical shaft, a steering box is connected to the other end of the vertical shaft, the conduction bevel gear is meshed with the transmission bevel gear, and a motor is fixed to the input end of the steering box;

[0008] A through slot is provided at the bottom of the processing box, a funnel-shaped collecting bucket is fixed in the through slot, a collecting pipe is fixed at the bottom of the collecting bucket, and an electric valve is arranged on the collecting pipe.

[0009] Preferably, an outer gear ring is coaxially fixed to one end of the rotating shaft close to the cooling tube, a rotating ring is rotatably connected inside the processing box, an inner gear ring is coaxially fixed to the inner ring of the rotating ring, the outer gear ring and the inner gear ring are meshed, a plurality of circumferentially evenly distributed arc strips are fixed to the side of the rotating ring close to the cooling tube, the arc strips are in contact with the inner wall of the cooling tube, and a first brush is fixed on the arc strips.

[0010] Preferably, a connecting ring is coaxially fixed on the rotating shaft, a plurality of scrapers evenly distributed around the circumference are fixed on the connecting ring, the scrapers are in contact with the filter screen, and a second brush is arranged on the scrapers.

[0011] Preferably, a shock-absorbing pad is provided between the motor and the processing box.

[0012] Preferably, the length of the arc strip is not less than one third of the length of the cooling pipe.

[0013] Preferably, the filter screen, guide blades, rotating ring and arc strip are made of nickel-based alloy or corrosion-resistant stainless steel.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. Through the settings of motor, guide fan blades and filter screen, the motor drives the shaft to rotate, and the guide fan blades form a large suction force, which accelerates the suction of solid phase or dust formed in the cooling pipe into the inside of the treatment box, reducing the time that the exhaust gas stays in the cooling pipe. At the same time, the solid phase generated will also move into the inside of the treatment box driven by strong wind force, avoiding excessive accumulation of solid phase and causing pipeline blockage.

[0016] 2. Through the settings of rotating ring, arc strip and inner gear ring, when the shaft rotates, multiple arc strips will clean the tube wall of the cooling pipe. After the dust is lifted, it enters the treatment box under the guidance of the guide fan blades, and then enters the flue gas recovery tower after being filtered by the filter. Since the arc strip has a certain curvature, when the arc strip rotates, it will drive the large particles to move toward the treatment box, thereby preventing blockage in the cooling pipe pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a plan view of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the processing box in the utility model.

[0019] Figure 3 It is a structural schematic diagram of the rotating shaft and the connecting piece in the utility model.

[0020] Figure 4 It is a schematic diagram of the transmission bevel gear and the conduction bevel gear in the utility model.

[0021] Figure 5 It is a schematic diagram of the inner gear ring and the outer gear ring in the utility model.

[0022] Figure 6 It is a schematic diagram of the cooperation between the scraper and the filter screen in the utility model.

[0023] Explanation of the symbols in the schematic diagram:

[0024] 1. Reactor; 2. Cooling pipe; 3. Processing box; 4. Flue gas recovery tower; 5. Rotating shaft; 6. Guide fan blades; 7. Filter; 8. Transmission bevel gear; 9. Vertical shaft; 10. Conduction bevel gear; 11. Steering box; 12. Motor; 13. Collection bucket; 14. Collection pipe; 15. Electric valve; 16. Outer gear ring; 17. Rotating ring; 18. Inner gear ring; 19. Arc strip; 20. Connecting ring; 21. Scraper. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Depend on Figures 1 to 4It is given, including a reactor 1, in which sulfur and yellow phosphorus are mixed to prepare phosphorus pentoxide, a cooling pipe 2 is arranged on the reactor 1, and the cooling pipe 2 is composed of an outer tube and an inner tube, a cooling coil is arranged between the inner tube and the outer tube, and a coolant flows in the cooling coil, and the tail gas generated by the preparation of phosphorus pentasulfide passes through the inner tube, and the tail gas enters the tail gas recovery tower after passing through the cooling pipe 2. The cooling pipe 2 is relatively common on the market and will not be described in detail here. A treatment box 3 is arranged at one end of the cooling pipe 2 away from the reactor 1, and the treatment box 3 is used to pre-treat the tail gas. A flue gas recovery tower 4 is arranged on one side of the treatment box 3, and the treatment box 3 is connected to the flue gas recovery tower 4 through a pipeline. The flue gas recovery tower 4 is a prior art and will not be described in detail here;

[0027] Considering that the tail gas generated during the production of phosphorus pentasulfide contains gases such as hydrogen sulfide and phosphine, if the tail gas contains moisture or reacts with water vapor during the cooling process, because phosphorus pentasulfide will quickly hydrolyze into phosphoric acid and hydrogen sulfide when it meets water, this process may form phosphate and sulfide deposits in the cooling pipe 2, thereby causing pipe blockage. A rotating shaft 5 is coaxially rotated in the treatment box 3, and a guide blade 6 is coaxially fixed on the rotating shaft 5. A filter screen 7 is fixed on the right side of the guide blade 6 in the treatment box 3 to block large particles and prevent them from entering the interior of the tail gas absorption tower. A transmission bevel gear 8 is coaxially fixed on the rotating shaft 5. A vertical shaft 9 is rotatably connected to the treatment box 3. A conduction bevel gear 10 is coaxially fixed to one end of the vertical shaft 9, and a steering box 11 is connected to the other end of the vertical shaft 9. A group of bevel gear sets are arranged inside the steering box 11, which is an existing structure and will not be described in detail. The conduction bevel gear 10 is meshed with the transmission bevel gear 8. A motor 12 is fixed to the input end of the steering box 11. Through the motor 12, the guide blades 6 and the filter screen 7, the motor 12 drives the rotating shaft 5 to rotate, and the guide blades 6 form a large suction force to accelerate the solid phase or dust formed in the cooling pipe 2 to be sucked into the interior of the processing box 3, thereby reducing the time that the exhaust gas stays in the cooling pipe 2. At the same time, the solid phase generated will also move to the inside of the processing box 3 driven by the strong wind force, thereby avoiding excessive accumulation of solid phases and causing pipeline blockage;

[0028] In order to facilitate the collection and processing of solid phase matter, a through groove is opened at the bottom of the processing box 3, and a funnel-shaped collecting bucket 13 is fixed in the through groove. A collecting pipe 14 is fixed at the bottom of the collecting bucket 13, and an electric valve 15 is arranged on the collecting pipe 14. When solid phase matter such as particles enter the processing box 3, they gather in the collecting bucket 13. The electric valve 15 below is set to open at a timed interval. The particles in the collecting bucket 13 are discharged through the collecting pipe 14. A collecting box can be arranged below the collecting pipe 14, and the collecting box can be cleaned regularly.

[0029] refer to Figures 3 to 5As shown, in the process of generating solid phase, after the exhaust gas enters the cooling pipe 2, it drops to a certain temperature or the cooling pipe 2 contains water vapor, and then solid phase will be generated. It is found through observation that most of the solid phase is distributed in the latter half of the cooling pipe 2, so it is necessary to clean the wall of the cooling pipe 2 in the latter section to prevent some solid phase from adhering to the wall, which is difficult to remove completely by wind power alone. An outer gear ring 16 is coaxially fixed to one end of the rotating shaft 5 close to the cooling pipe 2, and a rotating ring 17 is rotatably connected in the processing box 3. An inner gear ring 18 is coaxially fixed to the inner ring of the rotating ring 17, and the outer gear ring 16 is meshed with the inner gear ring 18. A plurality of arcuate strips 19 uniformly distributed around the circumference are fixed to the side of the rotating ring 17 close to the cooling pipe 2, and the arcuate strips 19 are in contact with the inner wall of the cooling pipe 2. A first brush is fixed on 19, which is arranged through a rotating ring 17, an arc strip 19 and an inner gear ring 18. When the rotating shaft 5 rotates, the outer gear ring 16 and the inner gear ring 18 are meshed to drive the rotating ring 17 to rotate, and multiple arc strips 19 clean the tube wall of the cooling tube 2. The arc strip 19 has two main cleaning effects. One is to scrape off the stubborn dust attached to the tube wall of the cooling tube 2. After the dust is lifted, it enters the treatment box 3 under the guidance of the guide fan blades 6, and then enters the flue gas recovery tower 4 after being filtered by the filter screen 7. The second is that the arc strip 19 rotates to clean the large particles adhered to the tube wall of the cooling tube 2. Since the arc strip 19 has a certain curvature, when the arc strip 19 rotates, the arc strip 19 will drive the large particles to move toward the direction of the treatment box 3, so as to prevent the pipeline of the cooling tube 2 from being blocked.

[0030] refer to Figure 6 As shown, in order to prevent the filter 7 from being blocked, a connecting ring 20 is coaxially fixed on the rotating shaft 5, and a plurality of scrapers 21 evenly distributed around the circumference are fixed on the connecting ring 20. The scrapers 21 are in contact with the filter 7, and a second brush is provided on the scrapers 21. The scrapers 21 rotate with the rotating shaft 5 and clean up the impurities on the filter 7.

[0031] In order to prevent the motor 12 from generating large vibrations during operation, which may affect the sealing between the cooling pipe 2 and the processing box 3, a shock-absorbing pad is provided between the motor 12 and the processing box 3. Although there are still small vibrations after the shock-absorbing pad is added, the effect of this vibration on the sealing between the cooling pipe 2 and the processing box 3 is negligible. At the same time, a certain amount of vibration is helpful to clean impurities on the filter 7 and is also convenient for the collection bucket 13 to discharge materials.

[0032] In order to achieve the cleaning effect of the cooling tube 2 wall, the length of the arc strip 19 is not less than one third of the length of the cooling tube 2. In order to prevent the arc strip 19 from being too long, the maximum length does not exceed two thirds of the length of the cooling tube 2.

[0033] In order to prevent the exhaust gas from corroding the parts inside the treatment box 3 and affecting the service life of the treatment box 3, the material of the treatment box 3, the filter screen 7, the guide blade 6, the rotating ring 17, the scraper 21 and the arc strip 19 is nickel-based alloy or corrosion-resistant stainless steel.

[0034] When the utility model is used:

[0035] First, the tail gas generated during the preparation of phosphorus pentasulfide enters the cooling tube 2, and the cooling tube 2 cools the tail gas;

[0036] Then, the motor 12 is started, and driven by the steering box 11, the vertical shaft 9, the conduction bevel gear 10 and the transmission bevel gear 8, the rotating shaft 5 rotates to drive the guide blade 6 to rotate. At this time, the cooling pipe 2 is attracted by a large wind force, and the dust and solid phase in the cooling pipe 2 are sucked into the inside of the processing box 3. After being filtered by the filter screen 7, the particles fall into the collecting bucket 13. The electric valve 15 will be opened at regular intervals, and the impurities in the collecting bucket 13 will be discharged under the guidance of the collecting pipe 14. It should be noted that when the electric valve 15 is opened, the reactor 1 no longer prepares phosphorus pentasulfide;

[0037] Secondly, as the shaft 5 rotates, the multiple arc strips 19 clean the wall of the cooling tube 2. After the dust is lifted up, it enters the treatment box 3 under the guidance of the guide blades 6, and then enters the flue gas recovery tower 4 after being filtered by the filter screen 7. At the same time, since the arc strips 19 have a certain curvature, the arc strips 19 will drive the large particles to move toward the treatment box 3.

[0038] Finally, the scraper 21 also rotates with the rotation of the shaft 5 and cleans the impurities on the filter screen 7.

[0039] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tail gas treatment device for phosphorus pentasulfide production process, comprising a reaction kettle (1), characterized in that: The reactor (1) is provided with a cooling pipe (2), one end of the cooling pipe (2) away from the reactor (1) is provided with a treatment box (3), one side of the treatment box (3) is provided with a fume recovery tower (4), and the treatment box (3) and the fume recovery tower (4) are connected via a pipeline; A rotating shaft (5) is coaxially rotated in the processing box (3), a guide blade (6) is coaxially fixed on the rotating shaft (5), a filter screen (7) located on the right side of the guide blade (6) is fixed in the processing box (3), a transmission bevel gear (8) is coaxially fixed on the rotating shaft (5), a vertical shaft (9) is rotatably connected to the processing box (3), a conduction bevel gear (10) is coaxially fixed to one end of the vertical shaft (9), a steering box (11) is connected to the other end of the vertical shaft (9), the conduction bevel gear (10) is meshed with the transmission bevel gear (8), and a motor (12) is fixed to the input end of the steering box (11); A through groove is provided at the bottom of the processing box (3), a funnel-shaped collecting bucket (13) is fixed in the through groove, a collecting pipe (14) is fixed at the bottom of the collecting bucket (13), and an electric valve (15) is provided on the collecting pipe (14).

2. The tail gas treatment device for phosphorus pentasulfide production process according to claim 1, characterized in that: An outer toothed ring (16) is coaxially fixed to one end of the rotating shaft (5) close to the cooling tube (2); a rotating ring (17) is rotatably connected inside the processing box (3); an inner toothed ring (18) is coaxially fixed to the inner ring of the rotating ring (17); the outer toothed ring (16) and the inner toothed ring (18) are meshed; a plurality of circumferentially evenly distributed arcuate strips (19) are fixed to the side surface of the rotating ring (17) close to the cooling tube (2); the arcuate strips (19) are in contact with the inner wall of the cooling tube (2); and a first brush is fixed to the arcuate strips (19).

3. A tail gas treatment device for phosphorus pentasulfide production process according to claim 2, characterized in that: A connecting ring (20) is coaxially fixed on the rotating shaft (5), a plurality of scrapers (21) evenly distributed around the circumference are fixed on the connecting ring (20), the scrapers (21) are in contact with the filter screen (7), and a second brush is arranged on the scrapers (21).

4. The tail gas treatment device for phosphorus pentasulfide production process according to claim 1, characterized in that: A shock-absorbing pad is provided between the motor (12) and the processing box (3).

5. The tail gas treatment device for phosphorus pentasulfide production process according to claim 2, characterized in that: The length of the arc strip (19) is not less than one third of the length of the cooling pipe (2).

6. The tail gas treatment device for phosphorus pentasulfide production process according to claim 3, characterized in that: The material of the processing box (3), the filter screen (7), the guide blade (6), the rotating ring (17), the scraper (21) and the arc strip (19) is nickel-based alloy or corrosion-resistant stainless steel.

Images