CN217988799U

CN217988799U - Dry-method dust removal system suitable for fluidized bed reaction

Info

Publication number: CN217988799U
Application number: CN202221238873.2U
Authority: CN
Inventors: 刘旭瑞; 袁闯; 石春凤
Original assignee: Zhengzhou Gesi Technology Development Co ltd
Current assignee: Zhengzhou Gesi Technology Development Co ltd
Priority date: 2022-05-23
Filing date: 2022-05-23
Publication date: 2022-12-09
Anticipated expiration: 2032-05-23

Abstract

The utility model provides a dry process dust pelletizing system suitable for fluidized bed reaction, use in coordination with fluidized bed reactor, including cyclone, prevent blockking up air cooler, the filter bank, collect jar and the hierarchical treater of weighing, cyclone and fluidized bed reactor's exit linkage, prevent blockking up air cooler is through the exit linkage of gas conveying pipeline with cyclone, the filter bank comprises the parallelly connected filtration that sets up of multiunit, multiunit filter is work in turn, every group filter all is provided with off-line high pressure blowback device, prevent the jam of filter through off-line high pressure blowback device, it is including a jar body and weighing sensor to collect the jar of weighing, collect and weigh the filterable powder of filter, the hierarchical treater is to collecting the powder of weighing the jar and carry out stage treatment, in a word the utility model has the advantages of solve gaseous powder smugglies secretly, reduce the thick liquid sediment and produce, recycle powder granule, reduction in production cost and keep polycrystalline silicon and organosilicon production to continue going on.

Description

Dry-method dust removal system suitable for fluidized bed reaction

Technical Field

The utility model relates to a dry process dust collecting equipment technical field, concretely relates to dry process dust pelletizing system suitable for fluidized bed reaction.

Background

At present, in the process of treating polycrystalline silicon and organic silicon, a fluidized bed reactor is used, wherein the fluidized bed reactor refers to a state that solid particle materials are in a suspension motion state (namely a fluidized state) in equipment under the action of air flow (or liquid flow), and a solid particle layer in the fluidized state has the characteristic of liquid and can be specially treated in the production process; at present, the phenomenon of gas dust entrainment can occur in the treatment process of polycrystalline silicon and organic silicon through a fluidized bed reactor, a common method is to use a cyclone separator for gas-solid separation, but the cyclone separator can only separate larger solid particles although the gas-solid separation can be performed, and the separation effect on powder with smaller particles cannot be good, so that flowing gas treated by the cyclone separator can entrain a large amount of powder to enter a subsequent spray tower, and wet dust removal is performed in the spray tower, not only is the waste of raw materials caused, but also the problem of slurry slag generated by the spray tower is difficult to treat, the treatment of the slurry slag needs to spend a large amount of manpower and material resources, and even under partial conditions, the whole production line needs to be stopped in order to clear clean the slurry slag.

Except cyclone separator, the conventional device capable of performing gas-solid separation at present also comprises a bag-type dust collector, but the bag-type dust collector is only suitable for a reaction system with small pressure difference and not too high temperature due to the limitation of the material of the filter bag and the structure of a supporting keel, and is not suitable for high-temperature fluidized bed reactors such as polysilicon, organic silicon and the like and processes with high powder density, and meanwhile, for high-temperature fluidized bed reactor systems such as polysilicon, organic silicon and the like, the pulse back-blowing gas of the bag-type dust collector is limited by pressure and gas volume, so that the filter bag cannot be cleaned effectively, and the filter bag is easy to block in the using process, once the filter bag is blocked, the shutdown treatment is required, so that the use of the existing bag-type dust collector also has great risk, and therefore, the dry-type dust collection system suitable for fluidized bed reaction is needed from the viewpoints of energy conservation, environmental protection, economy and safety, and the technical problems of poor dust collection effect, easy blocking, low production efficiency and high dust collection cost existing dust collection equipment are solved urgently.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical problem, the utility model aims to provide a dry process dust pelletizing system suitable for fluidized bed reaction solves the technical problem that gaseous powder secretly among the polycrystalline silicon that the aforesaid provided and the organosilicon process high temperature fluidized bed reaction system, when solving the thick liquid sediment, can also carry out classification and recycle to the powder granule of separation, guarantees the normal clear of polycrystalline silicon and organosilicon production.

The purpose of the utility model can be realized by the following technical scheme: the dry dedusting system suitable for fluidized bed reaction is matched with a fluidized bed reactor for use, and is used for synthesis and preparation of polycrystalline silicon and organic silicon monomers, and comprises a cyclone separator, an anti-blocking air cooler, a filter group, a collecting and weighing tank and a grading processor, wherein the cyclone separator is connected with an outlet of the fluidized bed reactor, the anti-blocking air cooler is connected with the outlet of the cyclone separator through a gas conveying pipeline, so that the flowing gas phase which is discharged by the cyclone separator and carries powder is cooled, the filter group consists of a plurality of groups of filters which are connected in parallel, the plurality of groups of filters work alternately, each group of filters are provided with an off-line high-pressure back-blowing device, the filter is prevented from being blocked through the off-line high-pressure back-blowing device, the collecting and weighing tank comprises a tank body and a weighing sensor, the weighing sensor is arranged below the tank body, the powder filtered by the filters is collected and weighed, the grading processor is used for grading the powder in the collecting and weighing tank, a recycling conveying pipeline is arranged at the outlet of the grading processor, and the recycling conveying pipeline is communicated with the fluidized bed reactor, so that large particles produced by the grading processor are conveyed to the fluidized bed reactor for recycling.

Furthermore, a tar impurity storage box body is arranged at the bottom of the anti-blocking air cooler, a high-temperature steam pipeline and a high-temperature steam valve arranged on the high-temperature steam pipeline are arranged on the side wall of the tar impurity storage box body, and the high-temperature steam pipeline is connected with a corresponding steam conveying source.

Furthermore, off-line high pressure blowback device includes the high-pressure gas shower nozzle, and the high-pressure gas shower nozzle sets up the exit position at the filter stack, and the high-pressure gas shower nozzle is connected with the high-pressure gas pipeline, all is provided with control flap on the entrance position of filter stack, exit position and the high-pressure gas pipeline.

Further, the inside filtration storehouse body that is provided with of filter, the bottom of the filtration storehouse body is provided with the dust storage compartment, and the high-pressure gas shower nozzle sets up at the top of the filtration storehouse body, and is located the top of dust storage compartment.

Furthermore, the outlet of the tank body is connected with the inlet of the grading processor through a weighing connecting pipeline, and after the collected powder reaches a certain weight, the powder in the tank body enters the grading processor along the weighing connecting pipeline.

Furthermore, the grading processor is provided with a grading discharge pipeline which is communicated with equipment of the next procedure of the dry dedusting system.

The utility model has the advantages that:

1. the utility model discloses a cyclone carries out preliminary processing to fluidized bed reactor exhaust gas of taking the dust, then cool down through preventing blockking up air cooler again, prevent that the gas and the dust of too high temperature from entering into subsequent filter, thereby destroy the filter, arouse the damage of filter screen, come separation gas and dust through the filter, wherein inside gas enters into subsequent spray column, carry out wet dedusting and handle, the dust is collected and is weighed through collecting weighing the jar, accumulate to certain degree when the dust, thereby carry the dust and handle hierarchical treater inside, the bigger dust of granule returns fluidized bed reactor to and handles, the less direct abandonment of dust of granule, thereby finally improve the production efficiency of polycrystalline silicon and organosilicon, increase corresponding equipment's life.

2. The utility model discloses a bottom at the anti-clogging air cooler sets up tar impurity case body, can accept the tar impurity that the inside long-term cooling of anti-clogging air cooler produced, and can be in the maintenance phase, through opening the high-temperature steam valve, make the high-temperature steam in the high-temperature steam pipeline enter into and prevent the anti-clogging air cooler inside, then soften tar impurity, and subsequent clearance, use in turn through the multiunit filter and guarantee the incessant of in-process going on, carry out the blowback through off-line high-pressure blowback device to the dust impurity who remains in the filter inside simultaneously, make the bottom of the filter storehouse body under these dusts, guarantee the long-term use of filter, can carry the dust to the inside of grading treater in batches through collecting the jar of weighing, reduce the loss of grading treater, carry out recycle to the large granule solid through the grading treater, avoid the waste of raw and other materials, the gas through the filter treater carries out inside the spray column simultaneously, can not produce the thick liquid sediment of handling the difficulty, use manpower and material resources are saved, guarantee that the production carries out incessantly.

Drawings

The present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the present invention;

fig. 2 is a schematic view of the connection between the middle filtering cabin and the dust storage cabin.

In the figure: 1. a fluidized bed reactor; 2. a cyclone separator; 3. an anti-clogging air cooler; 4. a filter; 5. collecting and weighing tanks; 6. a classification processor; 7. a gas delivery conduit; 8. an off-line high-pressure back-flushing device; 9. recycling the conveying pipeline; 10. a tar impurity storage box body; 11. a high temperature steam line; 12. a high temperature steam valve; 13. a high pressure gas showerhead; 14. a high pressure gas conduit; 15. a filtering bin body; 16. a dust storage bin; 17. weighing the connecting pipeline; 18. a graded discharge pipe; 19. and (4) a spray tower.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.

Example 1

Referring to fig. 1 and 2, a dry dedusting system suitable for fluidized bed reaction, which is used in cooperation with a fluidized bed reactor 1 and used for synthesis and preparation of polysilicon and organosilicon monomers, comprises a cyclone separator 2, an anti-clogging air cooler 3, a filtering set, a collecting and weighing tank 5 and a grading processor 6, wherein the cyclone separator 2 is connected with an outlet of the fluidized bed reactor 1, and the anti-clogging air cooler 3 is connected with an outlet of the cyclone separator 2 through a gas conveying pipeline 7, so that a flowing gas phase which is discharged from the cyclone separator 2 and carries powder is cooled; the temperature reduction treatment range of the anti-clogging air cooler 3 is from 350 ℃ to 370 ℃ to 180 ℃ to 240 ℃. The bottom of the anti-blocking air cooler 3 is provided with a tar impurity storage box body 10, the side wall of the tar impurity storage box body 10 is provided with a high-temperature steam pipeline 11 and a high-temperature steam valve 12 arranged on the high-temperature steam pipeline 11, and the high-temperature steam pipeline 11 is connected with a corresponding steam conveying source.

The filter group consists of three groups of filters which are arranged in parallel, the three groups of filters 4 work alternately, so that one group of filters 4 is kept in a working state, the second group of filters 4 is in a standby state, the third group of filters 4 is in a back-blowing cleaning state, the three groups of filters 4 are switched by a control valve to operate, the specific structure and the operation mode are the prior art, each group of filters 4 is provided with an off-line high-pressure back-blowing device 8, and the filters 4 are prevented from being blocked by the off-line high-pressure back-blowing device 8; the off-line high-pressure blowback device 8 comprises a high-pressure gas nozzle 13, the high-pressure gas nozzle 13 is arranged at the outlet position of the filter group, the high-pressure gas nozzle 13 is connected with a high-pressure gas pipeline 14, and control valves are arranged at the inlet position, the outlet position and the high-pressure gas pipeline 14 of the filter group. The inside filter storehouse body 15 that is provided with of filter 4, the bottom of the filter storehouse body 15 is provided with dust storage bin 16, and high-pressure gas shower nozzle 13 sets up at the top of the filter storehouse body 15, and is located the top of dust storage bin 16, and the exit position of filter 4 still is connected with gas outlet and dust outlet, and gas outlet is connected with the spray column 19 that sets up at filter 4 rear end process, and the dust outlet communicates with the import of collecting weighing tank 5.

Collect jar 5 of weighing including jar body and weighing sensor, weighing sensor sets up in the below of jar body, collect and weigh filter 4 filterable powder, the import connection of the export of jar body through weighing connecting tube 17 and grading processor 6, after the powder of collecting reaches a definite weight, the internal powder of jar gets into grading processor 6 along weighing connecting tube 17, how to detect and collect jar 5 inside powder of weighing and whether reach a definite weight and also belong to the conventional technology in this field, and not the utility model discloses a protection content. The grading processor 6 is used for grading the powder in the collecting and weighing tank 5, a recycling conveying pipeline 9 is arranged at the outlet of the grading processor 6, and the recycling conveying pipeline 9 is communicated with the fluidized bed reactor 1, so that the large-particle powder generated by the grading processor 6 is conveyed to the fluidized bed reactor 1 for recycling.

The grading processor 6 is provided with a grading discharge pipeline 18, and is communicated with equipment of the next process of the dry dedusting system through the grading discharge pipeline 18.

The utility model discloses in the in-process that uses, cyclone 2 carries out preliminary dust removal to the gas of fluidized bed reactor 1 exhaust area dust and handles, then cool down through preventing blockking up air cooler 3 again, gas and dust are cooled down to 180 ℃ -240 ℃ from 350 ℃ -370 ℃, from preventing that too high temperature gas and dust enter into in having prevented subsequent filter 4, thereby destroy filter 4, arouse the damage of filter 4 filter screen, then through being in operating condition's filter among three filter 4 gas and dust separation, wherein gas enters into inside subsequent spray column 19, carry out wet dedusting and handle, the dust is collected and weighed through collecting weighing jar 5, when the dust accumulation to certain degree, collecting weighing jar 5 carries the dust to the inside of grading treater 6 and handles, the bigger dust of granule returns fluidized bed reactor 1 and handles, the granule is direct abandonment, thereby finally improve polycrystalline silicon and organosilicon's production efficiency, increase the life of corresponding equipment; in a word, the utility model has the advantages of solving gaseous powder and smuggleing secretly, reducing the thick liquid sediment and producing, recycle powder granule, reduction in production cost and keeping polycrystalline silicon and organosilicon production to go on continuously.

The foregoing is merely illustrative and explanatory of the invention and is intended to be within the scope of the invention, as defined by the claims and the appended claims.

Claims

1. A dry dedusting system suitable for fluidized bed reaction is matched with a fluidized bed reactor (1) for use, is used for synthesis and preparation of polycrystalline silicon and organic silicon monomers, and is characterized in that: the device comprises a cyclone separator (2), an anti-blocking air cooler (3), a filter group, a collecting weighing tank (5) and a grading processor (6), wherein the cyclone separator (2) is connected with an outlet of a fluidized bed reactor (1), the anti-blocking air cooler (3) is connected with the outlet of the cyclone separator (2) through a gas conveying pipeline (7) so as to cool flowing gas phase which is discharged by the cyclone separator (2) and carries powder, the filter group comprises a plurality of groups of filters which are connected in parallel, the plurality of groups of filters (4) work alternately, each group of filters (4) is provided with an off-line high-pressure back-blowing device (8), the filters (4) are prevented from being blocked through the off-line high-pressure back-blowing devices (8), the collecting weighing tank (5) comprises a tank body and a weighing sensor, the weighing sensor is arranged below the tank body, the powder filtered by the filters (4) is collected and weighed, the grading processor (6) is used for grading the powder in the collecting weighing tank (5), a recycling conveying pipeline (9) is arranged at an outlet of the grading processor (6), and the grading processor (6) is used for conveying the powder to the fluidized bed reactor (1) and communicating the recycling pipeline (6).

2. The dry dedusting system suitable for the fluidized bed reaction according to claim 1, characterized in that a tar impurity storage box body (10) is arranged at the bottom of the anti-clogging air cooler (3), a high temperature steam pipeline (11) and a high temperature steam valve (12) arranged on the high temperature steam pipeline (11) are arranged on the side wall of the tar impurity storage box body (10), and the high temperature steam pipeline (11) is connected with a corresponding steam delivery source.

3. The dry dedusting system suitable for the fluidized bed reaction according to claim 2, characterized in that the off-line high pressure back-blowing device (8) comprises a high pressure gas nozzle (13), the high pressure gas nozzle (13) is arranged at the outlet of the filter set, the high pressure gas nozzle (13) is connected with a high pressure gas pipeline (14), and the inlet, outlet and high pressure gas pipeline (14) of the filter set are provided with control valves.

4. The dry dedusting system suitable for the fluidized bed reaction according to claim 3, characterized in that a filtering bin body (15) is arranged inside the filter (4), the filtering bin body (15) is provided with a dust storage bin (16), and the high-pressure gas spray head (13) is arranged at the top of the filtering bin body (15) and is positioned above the dust storage bin (16).

5. The dry dedusting system for fluidized bed reaction according to claim 4, characterized in that: the outlet of the tank body is connected with the inlet of the grading processor (6) through a weighing connecting pipeline (17), and when the collected powder reaches a certain weight, the powder in the tank body enters the grading processor (6) along the weighing connecting pipeline (17).

6. The dry dedusting system suitable for the fluidized bed reaction in accordance with claim 5, characterized in that the grading processor (6) is provided with a grading discharge pipe (18) and is communicated with the equipment of the next process of the dry dedusting system through the grading discharge pipe (18).