Gas-solid separation device for collecting spherical silicon dioxide

Abstract

The utility model relates to a gas-solid separation device for collecting spherical silicon dioxide, which comprises a urea solution stirring tank, a urea solution storage tank, a conveying and valve device, an induced draft fan, an integrated denitration device, a cyclone collection bin and a spheroidizing silicon furnace. On the premise of keeping dust purification, the denitration rate is greatly improved, escape of raw material ammonia gas is low, and the method has great significance on the problem of gas-solid separation flue gas generated after silicon dioxide production.

Description

Technical Field

[0001] The utility model relates to a gas-solid separation device, in particular to a gas-solid separation device for collecting spherical silicon dioxide. Background Art

[0002] Silicon dioxide, with its excellent dielectric properties and low thermal expansion coefficient, is widely used in epoxy molding compounds and copper-clad laminates. High silicon dioxide filling can reduce costs, improve thermal conductivity, reduce the thermal expansion coefficient, and increase strength. Consequently, there is a high demand for spherical silicon dioxide production. However, the high nitrogen oxide content of flue gas generated during the production process is a significant concern. Wastewater and wastewater must be treated to meet national standards before discharge to reduce environmental pollution.

[0003] Application number CN202323088259.X discloses a denitrification reaction device for a honeycomb denitrification catalyst, which includes a processing chamber, an air inlet chamber, an air outlet chamber, a catalyst, a rectifier, a support ring and an aeration component. The aeration component is opened to discharge ammonia into the air inlet chamber, mixed with the original flue gas and enter the processing chamber, and then evenly diverted through the circular holes on the rectifier so that it can evenly react with the surface of the catalyst; however, its disadvantage is that the flow rate during the honeycomb denitrification process is too fast, the denitrification reaction time is short, and the reaction is not thorough enough. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the background technology and provide a gas-solid separation device for collecting spherical silica.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A gas-solid separation device for collecting spherical silicon dioxide, comprising a urea solution stirring tank, a urea solution storage tank, a conveying and valve device, an induced draft fan, an integrated denitrification device, a cyclone collection bin, and a spheroidizing silicon furnace;

[0007] The urea solution stirring tank is connected to the urea solution storage tank front to back. The delivery and valve device runs through the switches and pipelines of the entire device. The induced draft fan is connected to the integrated denitrification device and the flue gas bypass pipe through a pipeline and an expansion joint. The induced draft fan is provided with an exhaust duct. The inlet of the cyclone collection bin is connected to the outlet of the spheroidizing silicon furnace through a pipeline.

[0008] The integrated denitrification device is the main reaction part of the device, which includes a denitrification chamber with a multi-layer ceramic filter cartridge as the main body. The ceramic filter cartridge in the denitrification chamber includes a catalyst filter layer and filter holes, and the filter hole diameter is 0.1-0.8 microns.

[0009] Preferably, the urea solution stirring tank includes a bucket elevator, a urea delivery bin and a three-blade stirring paddle in the tank, the bucket elevator is installed in front of the urea solution stirring tank, the urea delivery bin is installed on the bucket elevator to deliver urea to the tank, and the three-blade stirring paddle is fixed in the urea solution stirring tank.

[0010] Preferably, the urea solution storage tank is provided with a high and low level gauge, and the outlet of the urea solution storage tank is connected to the delivery pump pipeline by a valve control.

[0011] Preferably, the conveying and valve device includes a conveying pump, a pipe valve, a flue gas bypass pipe, an expansion joint, a urea solution pipe and a denitrification exhaust pipe. The pipe valve is located on the outlet pipe of the cyclone collection bin and the flue gas bypass pipe. The expansion joint is located on the outlet pipe of the spheroidizing silicon furnace and the outlet pipe of the cyclone collection bin. The urea solution pipe is located behind the urea solution storage tank and is also provided with several valves. The denitrification exhaust pipe is installed on the integrated denitrification device and is connected to the induced draft fan.

[0012] Preferably, the integrated denitrification device also includes a mixing bin, a clean air bin, a static pressure box and a unloading bin, and a plurality of diversion guide plates are installed in the mixing bin; a cross bar is installed in the static pressure box, and a plurality of spray nozzles are installed on the cross bar; the unloading bin includes a baffle, a discharge auger and a discharge port, and the discharge port is installed under the discharge auger, and the baffle is surrounded outside the unloading bin.

[0013] Preferably, a coarse silicon discharge port is provided below the cyclone collection bin.

[0014] Preferably, the spheroidizing silicon furnace is divided into an angular silicon powder area and a spherical silicon powder area, and an auger feed port is installed on the top of the spheroidizing silicon furnace.

[0015] After the raw silicon is introduced into the auger feed port 73, it first enters the angular silicon powder area 71 for 2500℃ natural gas oxygen-enriched combustion to convert it into spherical silicon powder and enter the spherical silicon powder area 72. The material components entering the cyclone collection bin 6 from the silicon furnace are silicon powder, H2O, CO2 and nitrogen oxide flue gas, etc. The coarse silicon outlet 61 under the cyclone collection bin 6 first outputs the first-level coarse silicon, and the fine silicon enters the integrated denitrification device 5 together with the flue gas; at the same time, urea is dissolved on the other side to form a 32% urea solution. After the temperature reaches 330℃, it enters the mixing bin 51 through the urea solution pipe 35 and is fully mixed with the flue gas. It should be noted here that the production must be completed before the collection and denitrification Nitrate, denitrification and production are not carried out simultaneously; in the denitrification process, the flue gas, ammonia and silicon powder first enter the mixing bin 51 and are evenly mixed through the diversion guide plate 8, and then the ammonia is sprayed on the static pressure box 54 and then enters the denitrification bin 52 ceramic filter cartridge for catalytic denitrification reaction. After the reaction is completed, the treated clean gas is stored in the clean gas bin 53 and then discharged directly, and the fine silicon powder enters the unloading bin 55 and passes through the unloading plate into the unloading auger 552 and the discharge port 553 for discharge and collection; the water vapor and carbon dioxide clean gas in the process can be introduced into the exhaust pipe of the induced draft fan through the flue gas bypass pipe 33 and the denitrification exhaust pipe 36 connected to the denitrification device and then discharged, realizing gas-solid separation.

[0016] Preferably, the diversion guide plate includes a mounting rod, a guide plate and an adjusting member. The guide plate is a straight plate. A group of diversion guide plates has at least two mounting rods, and the mounting rod passes through multiple guide plates. The angle between the mounting rod and the guide plate is adjusted by the adjusting member.

[0017] Preferably, the adjusting member includes a fixed rod, a connecting shaft, a driving member and a sliding rod; the fixed rod is hollow inside, and its long side direction is consistent with the direction of the mounting rod, and the sliding rod is welded thereon, and the sliding rod passes through and is slidably connected to the mounting rod, and the fixed rod is also provided with a strip through groove; the upper and lower ends of the connecting shaft pass through the strip through groove and are welded and fixed to the guide plate; the driving member is connected to the fixed rod and the connecting shaft, and the driving member includes a linkage bar and a driving bolt, and the linkage bar is located in the inner cavity of the fixed rod, and a plurality of through holes are provided on the linkage bar, through which the connecting shaft is rotated relative to the linkage bar; the driving bolt nut is externally arranged, and the screw section extends into the fixed rod and is threadedly connected at one end of the linkage bar.

[0018] Apply force to the driving bolt 8332, and the driving bolt 8332 drives the linkage bar 8331 to move along the opening direction of the strip groove 8311 through cooperation with the fixing rod 831, and then drives the guide plate 82 to change its angle through the connecting shaft 832 until the direction of the gas channel is appropriate, changing the flue gas velocity and temperature distribution at the flue cross-section and right-angle turn, making the flow field at the ammonia injection grid uniform, ensuring the uniform distribution of flue gas and ammonia when entering the catalyst layer, and improving the denitrification effect of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall device diagram of the utility model;

[0020] Figure 2 is a structural diagram of the ceramic filter cartridge in the denitrification warehouse of the present invention;

[0021] Figure 3 shows the utility model Figure 1 A magnified schematic diagram of point A;

[0022] Figure 4 is a schematic diagram of the diversion guide plate of the utility model;

[0023] Figure 5 shows the utility model Figure 4 An enlarged schematic diagram of point B;

[0024] FIG6 is a schematic cross-sectional view of the structure of FIG4 of the present invention;

[0025] Figure: 1. Urea solution mixing tank; 11. Bucket elevator; 12. Urea delivery bin; 13. Three-blade agitator; 2. Urea solution storage tank; 21. High and low level gauge; 3. Delivery and valve device; 31. Delivery pump; 32. Pipe valve; 33. Flue gas bypass pipe; 34. Expansion joint; 35. Urea solution pipe; 36. Denitration exhaust pipe; 4. Induced draft fan; 41. Exhaust pipe; 5. Integrated denitration device; 51. Mixing bin; 52. Denitration bin; 521. Ceramic filter cartridge; 522. Catalyst filter element; 523. Filter hole; 53. Clean air bin; 54. Static Press box; 55, unloading bin; 541, cross bar; 542, spraying port; 551, baffle; 552, discharging auger; 6, cyclone collecting bin; 61, coarse silicon discharge port; 7, spheroidizing silicon furnace; 71, angular silicon powder area; 72, spherical silicon powder area; 73, auger feed port; 8, diversion guide plate; 81, mounting rod; 82, guide plate; 821, strip hole; 83, adjusting part; 831, fixing rod; 8311, strip through groove; 832, connecting shaft; 833, driving part; 834, sliding rod; 8331, linkage bar; 8332, driving bolt. DETAILED DESCRIPTION

[0026] 1 to 6 , a gas-solid separation device for collecting spherical silica includes a urea solution stirring tank 1, a urea solution storage tank 2, a conveying and valve device 3, an induced draft fan 4, an integrated denitrification device 5, a cyclone collection bin 6, and a spheroidizing silicon furnace 7;

[0027] The urea solution stirring tank 1 is connected to the urea solution storage tank 2 front to back. The conveying and valve device 3 runs through the switches and pipelines of the entire device. The induced draft fan 4 is connected to the integrated denitrification device 5 and the flue gas bypass pipe 33 through a pipeline and an expansion joint 34. The induced draft fan 4 is provided with an exhaust duct 41. The inlet of the cyclone collection chamber 6 is connected to the outlet of the spheroidizing silicon furnace 7 through a pipeline.

[0028] The integrated denitrification device 5 is the main reaction part of the device, which includes a denitrification chamber 52 with a multi-layer ceramic filter cartridge as the main body. The ceramic filter cartridge 521 in the denitrification chamber 52 includes a catalyst filter layer 522 and filter holes 533. The filter diameter of the filter holes 533 is 0.1-0.8 microns.

[0029] The urea solution stirring tank 1 includes a bucket elevator 11, a urea delivery bin 12 and a three-blade stirring paddle 13 in the tank. The bucket elevator 11 is installed in front of the urea solution stirring tank 1. The urea delivery bin 12 is installed on the bucket elevator 11 to transport urea into the tank. The three-blade stirring paddle 13 is fixed in the urea solution stirring tank 1.

[0030] A high and low level gauge 21 is provided in the urea solution storage tank 2 , and a pipeline between the outlet of the urea solution storage tank 2 and the delivery pump 31 is connected to a valve for control.

[0031] The conveying and valve device 3 includes a conveying pump 31, a pipe valve 32, a flue gas bypass pipe 33, an expansion joint 34, a urea solution pipe 35 and a denitrification exhaust pipe 36. The pipe valve 32 is located on the outlet pipe of the cyclone collection bin 6 and the flue gas bypass pipe 33. The expansion joint 34 is located on the outlet pipe of the spheroidizing silicon furnace 7 and the outlet pipe of the cyclone collection bin 6. The urea solution pipe 35 is located behind the urea solution storage tank 2 and is also provided with several valves. The denitrification exhaust pipe 36 is installed on the integrated denitrification device 5 and is connected to the induced draft fan 4.

[0032] The integrated denitrification device 5 also includes a mixing bin 51, a clean air bin 53, a static pressure box 54 and a discharge bin 55. A number of diversion guide plates 8 are installed in the mixing bin 51; a cross bar 541 is installed in the static pressure box 54, and a number of spraying ports 542 are installed on the cross bar 541; the discharge bin 55 includes a baffle 551, a discharge auger 552 and a discharge port 553. The discharge port 553 is installed under the discharge auger 552, and the baffle 551 is surrounded by the outside of the discharge bin 55.

[0033] A coarse silicon discharge port 61 is provided below the cyclone collecting bin 6 .

[0034] The spheroidizing silicon furnace 7 is divided into an angular silicon powder area 71 and a spherical silicon powder area 72 . An auger feed port 73 is installed on the top of the spheroidizing silicon furnace 7 .

[0035] The diversion guide plate 8 includes a mounting rod 81, a guide plate 82 and an adjusting member 83. The guide plate 82 is a straight plate. A group of diversion guide plates 8 has at least two mounting rods 81, and the mounting rod 81 passes through multiple guide plates 82. The angle between the mounting rod 81 and the guide plate 82 is adjusted by the adjusting member 83.

[0036] The adjusting member 83 includes a fixed rod 831, a connecting shaft 832, a driving member 833 and a sliding rod 834; the fixed rod 831 is hollow inside, and its long side direction is consistent with the direction of the mounting rod 81. A sliding rod 834 is welded on it, and the sliding rod 834 passes through and is slidably connected to the mounting rod 81. The fixed rod 831 is also provided with a bar-shaped through-slot 8311; the upper and lower ends of the connecting shaft 832 pass through the bar through-slot 8311 and are welded and fixed to the guide plate 82; the driving member 833 is connected to the fixed rod 831 and the connecting shaft 832, and the driving member 833 includes a linkage bar 8331 and a driving bolt 8332. The linkage bar 8331 is located in the inner cavity of the fixed rod 831, and a plurality of through holes are provided on the linkage bar 8331, through which the connecting shaft 832 is rotated relative to the linkage bar 8331; the nut of the driving bolt 8332 is externally arranged, and the screw section extends into the fixed rod 831 and is threadedly connected at one end of the linkage bar 8331.

[0037] The working principle of this embodiment is as follows: after the raw silicon is introduced into the auger feed port 73, it first enters the angular silicon powder area 71 for 2500℃ natural gas oxygen-enriched combustion to convert it into spherical silicon powder and enter the spherical silicon powder area 72. The material components entering the cyclone collection bin 6 from the silicon furnace are silicon powder, H2O, CO2 and nitrogen oxide flue gas, etc. The coarse silicon discharge port 61 under the cyclone collection bin 6 first outputs the first-level coarse silicon, and the fine silicon enters the integrated denitrification device 5 together with the flue gas; at the same time, urea is dissolved on the other side to form a 32% urea solution. After the temperature reaches 330℃, it enters the mixing bin 51 through the urea solution pipe 35 to be fully mixed with the flue gas. It should be noted here that Denitrification must be collected after production is completed, and denitrification and production are not carried out simultaneously; in the denitrification process, the flue gas, ammonia and silicon powder first enter the mixing bin 51 and are evenly mixed through the diversion guide plate 8, and then the ammonia is sprayed on the static pressure box 54 and then enters the denitrification bin 52 ceramic filter cartridge for catalytic denitrification reaction. After the reaction is completed, the treated clean gas is stored in the clean gas bin 53 and then discharged directly, and the fine silicon powder enters the unloading bin 55 and passes through the unloading plate into the unloading auger 552 and the discharge port 553 for discharge and collection; the water vapor and carbon dioxide clean gas in the process can be introduced into the exhaust pipe of the induced draft fan through the flue gas bypass pipe 33 and the denitrification exhaust pipe 36 connected to the denitrification device and then discharged.

Claims

1. A gas-solid separation device for collecting spherical silicon dioxide, characterized in that: It includes a urea solution stirring tank (1), a urea solution storage tank (2), a conveying and valve device (3), an induced draft fan (4), an integrated denitrification device (5), a cyclone collection chamber (6), and a spheroidizing silicon furnace (7); The urea solution stirring tank (1) is connected to the urea solution storage tank (2) front to back; the delivery and valve device (3) runs through the switches and pipelines of the entire device; the induced draft fan (4) is connected to the integrated denitrification device (5) and the flue gas bypass pipe (33) through a pipeline and an expansion joint (34); an exhaust duct (41) is provided on the induced draft fan (4); the inlet of the cyclone collection bin (6) is connected to the outlet of the spheroidizing silicon furnace (7) through a pipeline; The integrated denitration device (5) is the main reaction part of the device, and includes a denitration chamber (52) with a multi-layer ceramic filter cartridge as the main body. The ceramic filter cartridge (521) in the denitration chamber (52) includes a catalyst filter layer (522) and filter holes (533).

2. A gas-solid separation device for collecting spherical silicon dioxide according to claim 1, characterized in that: The urea solution stirring tank (1) comprises a bucket elevator (11), a urea delivery bin (12), and a three-blade stirring paddle (13) in the tank. The bucket elevator (11) is installed in front of the urea solution stirring tank (1), the urea delivery bin (12) is installed on the bucket elevator (11) to deliver urea into the tank, and the three-blade stirring paddle (13) is fixed in the urea solution stirring tank (1).

3. A gas-solid separation device for collecting spherical silicon dioxide according to claim 1, characterized in that: The urea solution storage tank (2) is provided with a high and low level gauge (21), and the outlet of the urea solution storage tank (2) is connected to a pipeline of a delivery pump (31) via a valve for control.

4. A gas-solid separation device for collecting spherical silicon dioxide according to claim 1, characterized in that: The delivery and valve device (3) includes a delivery pump (31), a pipe valve (32), a flue gas bypass pipe (33), an expansion joint (34), a urea solution pipe (35) and a denitrification exhaust pipe (36); the pipe valve (32) is located on the outlet pipe of the cyclone collection bin (6) and the flue gas bypass pipe (33); the expansion joint (34) is located on the outlet pipe of the spheroidizing silicon furnace (7) and the outlet pipe of the cyclone collection bin (6); the urea solution pipe (35) is located behind the urea solution storage tank (2) and is also provided with a plurality of valves; the denitrification exhaust pipe (36) is installed on the integrated denitrification device (5) and is connected to the induced draft fan (4).

5. A gas-solid separation device for collecting spherical silicon dioxide according to claim 1, characterized in that: The integrated denitrification device (5) further comprises a mixing bin (51), a clean air bin (53), a static pressure box (54) and a discharge bin (55); a plurality of diversion guide plates (8) are installed in the mixing bin (51); a crossbar (541) is installed in the static pressure box (54), and a plurality of spraying ports (542) are installed on the crossbar (541); the discharge bin (55) comprises a baffle (551), a discharge auger (552) and a discharge port (553); the discharge port (553) is installed under the discharge auger (552), and the baffle (551) surrounds the discharge bin (55).

6. A gas-solid separation device for collecting spherical silicon dioxide according to claim 1, characterized in that: A coarse silicon discharge port (61) is provided below the cyclone collection bin (6).

7. A gas-solid separation device for collecting spherical silicon dioxide according to claim 1, characterized in that: The spheroidizing silicon furnace (7) is divided into an angular silicon powder area (71) and a spherical silicon powder area (72). An auger feed port (73) is installed on the top of the spheroidizing silicon furnace (7).

8. A gas-solid separation device for collecting spherical silicon dioxide according to claim 5, characterized in that: The diversion guide plate (8) comprises a mounting rod (81), a guide plate (82) and an adjusting member (83). The guide plate (82) is a straight plate. A group of diversion guide plates (8) has at least two mounting rods (81), and the mounting rods (81) pass through a plurality of the guide plates (82). The angle between the mounting rods (81) and the guide plates (82) is adjusted by the adjusting member (83).

9. A gas-solid separation device for collecting spherical silicon dioxide according to claim 8, characterized in that: The adjusting member (83) includes a fixed rod (831), a connecting shaft (832), a driving member (833) and a sliding rod (834); the fixed rod (831) is hollow inside, and its long side direction is consistent with the direction of the mounting rod (81), and the sliding rod (834) is welded thereon, and the sliding rod (834) passes through and is slidably connected to the mounting rod (81), and the fixed rod (831) is also provided with a strip-shaped through-slot (8311); the upper and lower ends of the connecting shaft (832) pass through the strip-shaped through-slot (8311) and are welded and fixed to the guide plate (82); The driving member (833) is connected to the fixed rod (831) and the connecting shaft (832). The driving member (833) includes a linkage bar (8331) and a driving bolt (8332). The linkage bar (8331) is located in the inner cavity of the fixed rod (831). The linkage bar (8331) is provided with a plurality of through holes, through which the connecting shaft (832) is rotated relative to the linkage bar (8331). The nut of the driving bolt (8332) is externally arranged, and the screw section extends into the fixed rod (831) and is threadedly connected to one end of the linkage bar (8331).

10. The gas-solid separation device for collecting spherical silicon dioxide according to claim 1, characterized in that: The filter pore (533) has a filter diameter of 0.1-0.8 microns.

Images