CN107857270A - A kind of silica powder drying and nitrogen gas recovering apparatus - Google Patents
A kind of silica powder drying and nitrogen gas recovering apparatus Download PDFInfo
- Publication number
- CN107857270A CN107857270A CN201711347663.0A CN201711347663A CN107857270A CN 107857270 A CN107857270 A CN 107857270A CN 201711347663 A CN201711347663 A CN 201711347663A CN 107857270 A CN107857270 A CN 107857270A
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- nitrogen
- gas
- silica powder
- filter
- powder drying
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/02—Silicon
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicon Compounds (AREA)
- Drying Of Solid Materials (AREA)
- Drying Of Gases (AREA)
Abstract
The invention discloses a kind of silica powder drying and nitrogen gas recovering apparatus,Including silica powder drying device,Silica powder drying device is provided with air inlet,Gas outlet,Charging aperture,Discharging opening,The retracting device also includes the filter being connected with silica powder drying device,The gas-liquid separator being connected with filter,The dehydration sled block being connected with gas-liquid separator,The nitrogen heater being connected with dehydration sled block,The dehydration sled block includes two towers for being filled with adsorbent,Two towers are alternately dried and regenerated,The filter is provided with air inlet,Gas outlet,Discharge gate,The gas outlet of the silica powder drying device and the air inlet of filter connect,The discharge gate of filter is connected with silica powder drying device,The gas of filter outlet mouth discharge is passed into gas-liquid separator,The gas discharged in gas-liquid separator is passed into dehydration sled block,Nitrogen heater is passed through through the dehydration sled dried dry gas of block,Nitrogen after nitrogen heater heats is passed through the air inlet of silica powder drying device.
Description
Technical field
The present invention relates to a kind of silica powder drying and nitrogen gas recovering apparatus, when mainly being synthesized to the trichlorosilane of polysilicon
Raw material silica flour carries out high temperature drying, belongs to silica powder drying technical field.
Background technology
In today that the whole world is perplexed by increasingly severe problem of environmental pollution, environmentally friendly importance gradually obtains society
The accreditation and concern of meeting.Photovoltaic generation has extensively to the whole society and particularly acted on, polysilicon as clean reproducible energy
It is the basic material of electronics industry and solar photovoltaic industry.Trichlorosilane is the primary raw material for producing polysilicon, and silica flour
It is the important source material for producing trichlorosilane, trichlorosilane is typically produced by silica flour and hydrogen chloride gas in reaction reaction in furnace, and three
Silicon chloride is met water and easily reacted, and silica flour can absorb certain moisture during transport and storage, so must before use
It need ask silica flour that processing is dried.
At present, silica powder drying uses outer steam disc tubular type and chuck drier.Drier can be passed through steam, hot water or deep fat
Heated, while nitrogen is blown into from drier bottom, the nitrogen of flowing takes away the moisture of silica flour, then is arranged by engine manifold
Toward eluting column, each heat time is 8 ~ 10 hours, and dried silica flour passes through in silica flour feed bin and enters trichlorosilane reactor.
Nitrogen at the top of from drier out is usually directly to be vented, or is discharged into offgas duct, is then sent for eluting column and is absorbed
Processing.The problem of this silica powder drying is present be：1）Silica flour does not reclaim completely, causes the waste of raw material；2）Contain a small amount of silicon
The nitrogen of powder directly discharges, and causes dust pollution producing region to reach cleaning and requires；3）The waste of a large amount of nitrogen, wastes energy
Source；4）Use for a long time, the offgas duct of elution is easily blocked by silica flour, influences to produce.
The content of the invention
It is an object of the invention to provide a kind of silica powder drying and nitrogen gas recovering apparatus, is existed with solving the silica flour of prior art
Silica flour reclaims the technical problem that incomplete and nitrogen wastes when drying.
The present invention adopts the following technical scheme that：A kind of silica powder drying and nitrogen gas recovering apparatus, including silica powder drying device, silica flour
Drier is provided with air inlet, gas outlet, charging aperture, discharging opening, and the retracting device also includes what is be connected with silica powder drying device
Filter, the gas-liquid separator being connected with filter, the dehydration sled block being connected with gas-liquid separator, the nitrogen being connected with dehydration sled block
Hot-air heater, the dehydration sled block include two towers for being filled with adsorbent, and a tower is for moisture in absorption nitrogen to nitrogen
It is dried, another tower is regenerated with regeneration gas to adsorbent, and two towers are alternately dried and regenerated, the filter
Air inlet, gas outlet, discharge gate are provided with, the gas outlet of the silica powder drying device and the air inlet of filter connect, filter
Discharge gate be connected with silica powder drying device, filter outlet mouth discharge gas be passed into gas-liquid separator, gas-liquid separator
The gas of middle discharge is passed into dehydration sled block, nitrogen heater is passed through through the dehydration sled dried dry gas of block, through nitrogen
Nitrogen after heater heating is passed through the air inlet of silica powder drying device.
Nitrogen supercharging machine is provided between the filter and gas-liquid separator.
The filter includes the grade one filter and secondary filter being cascaded, grade one filter and silica powder drying
Device is connected, and secondary filter is connected with nitrogen supercharging machine, and the discharge gate of grade one filter and secondary filter is passed into silica flour
In drier.
Nitrogen buffer tank is provided between the dehydration sled block and nitrogen heater, the dried drying nitrogen of block is prized through dehydration
First it is passed into nitrogen buffer tank and enters back into nitrogen heater heating.
Fresh nitrogen is connected with the nitrogen buffer tank to make up line.
The silica powder drying device is heated using chuck, and chuck is provided with middle pressure steam import and medium-pressure steam condensate goes out
Mouthful.
The bottom of the silica powder drying device is provided with nitrogen distributor.
The nitrogen heater is electric heater.
The beneficial effects of the invention are as follows：The running of the present invention is that the nitrogen after nitrogen heater heats is passed into
The vapor of silica flour is taken away in silica powder drying device, the silica flour in drier is in rarefaction, containing moisture and carries secretly
The nitrogen of silica flour enters in filter from the top exit of silica powder drying device is filtered to remove silica flour, what filter bottom filtered down
Silica flour irregularly returns to silica powder drying device, and the aqueous nitrogen of filter top is further into dehydration sled block after gas-liquid separator
The moisture content in nitrogen is removed, its dew point is less than -70 DEG C, dried nitrogen is entered back into nitrogen electric heater and recycled,
Dried industrial silica fume delivers to subsequent processing.The present invention is removed the silicon powder particle in nitrogen by filter, not only completely
Reclaim silica flour, moreover it is possible to prevent silica flour from blocking pipeline.During silica powder drying of the present invention, nitrogen is in a closed circulation line
In recycle, realize cleanly production, environmental protection, energy-saving and emission-reduction, reduce production cost, ensuring that drying effect is same
When avoid the entrance system of air, oxygen and other pollutants.Present apparatus overall structure is simple, easy to operate, and nitrogen use level is less,
The advantages of with environmental protection and energy saving.
Further, nitrogen supercharging machine makes nitrogen pressure stable, and guarantee system is continuously run.
Further, grade one filter can be filtered to remove silica powder drying device discharge nitrogen in most of silica flour, two
Level filter can be filtered to remove micro silica flour, by double-filtration, further reduce the consumption of silica flour, while realize dry
The recovery of net nitrogen re-uses.
Further, the use of surge tank and supplement fresh nitrogen, ensure that nitrogen use level is stable in drier, enables the system to
Continuous reliable operation.
Further, using nitrogen distributor, make nitrogen distribution more uniform, improve the service efficiency of nitrogen, to shorten
Drying time.
Brief description of the drawings
Fig. 1 is the structural representation of an embodiment of the present invention；
Fig. 2 is the schematic diagram of dehydration sled block in Fig. 1.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
The structure of an embodiment of the present invention is as shown in figure 1, the silica powder drying and nitrogen gas recovering apparatus of the present embodiment include
Silica powder drying device 1, the filter being connected with silica powder drying device 1, the gas-liquid separator 5 being connected with filter and gas-liquid separator 5
The dehydration sled block 6 of connection, with the nitrogen heater 8 that is connected of dehydration sled block 6, silica powder drying device 1 provided with air inlet, gas outlet,
Charging aperture, discharging opening, the silica powder drying device 1 are heated using chuck, and chuck is provided with middle pressure steam import and middle pressure steam is cold
Condensate outlet.The bottom of the silica powder drying device 1 is provided with nitrogen distributor 9.The filter be provided with air inlet, gas outlet,
Discharge gate, the gas outlet of the silica powder drying device 1 and the air inlet of filter connect, discharge gate and the silica powder drying device of filter
Connection, the gas of filter outlet mouth discharge are passed into gas-liquid separator 5, and the gas discharged in gas-liquid separator 5 is passed into
In dehydration sled block 6, nitrogen heater 8 is passed through through dehydration sled 6 dried dry gas of block, after the heating of nitrogen heater 8
Nitrogen is passed through the air inlet of silica powder drying device 1.Nitrogen supercharging machine 4 is provided between the filter and gas-liquid separator 5.The mistake
Filter includes the grade one filter 2 and secondary filter 3 being cascaded, and grade one filter 2 is connected with silica powder drying device 1, and two
Level filter 3 is connected with nitrogen supercharging machine 4, and the discharge gate of grade one filter 2 and secondary filter 3 is passed into silica powder drying device
In 1.Nitrogen buffer tank 7 is provided between the dehydration sled block 6 and nitrogen heater 8,6 dried drying nitrogen of block is prized through dehydration
First it is passed into nitrogen buffer tank 7 and enters back into nitrogen heater 8 and heat.Fresh nitrogen benefit is connected with the nitrogen buffer tank 7
Fill pipeline 10.The nitrogen heater 8 is electric heater.
The dehydration sled block 6 includes two towers for being filled with adsorbent, and a tower is for moisture in absorption nitrogen to nitrogen
It is dried, another tower is regenerated with regeneration gas to adsorbent, and two towers are alternately dried and regenerated.Dehydration sled block 6
Schematic diagram as shown in Fig. 2 dehydration sled block in two tower bottoms be provided with aqueous nitrogen inlet duct road 61 and regeneration after gas arrange
Air pipe 64, two tower tops that dehydration is prized in block are provided with drying nitrogen gas exhaust piping 62 and regeneration gas air inlet pipeline 61.Gas-liquid
The nitrogen discharged in separator 5 is dried by aqueous nitrogen inlet duct road 61 into a tower, dried drying nitrogen
Discharged by drying nitrogen gas exhaust piping 62, regeneration gas enters another tower by regeneration gas air inlet pipeline 63, to adsorbent in the tower
Discharged after being regenerated by gas exhaust pipeline 64 after regenerating.
The present embodiment specific work process is as follows：Silica flour to be dried is added in silica powder drying device 1, is sufficiently displaced from through nitrogen
Ensure in silica powder drying device after anaerobic, 180 DEG C of pressure 0.3MPa hot nitrogen will be heated to through nitrogen heater 8 through silica powder drying
Device bottom nitrogen distributor 9 is passed through in silica powder drying device, and the middle pressure for being passed through 1.0Mpa in the external jacket of silica powder drying device 1 simultaneously is steamed
Vapour, nitrogen take away dry silica flour and produce vapor from bottom to top, and the silica flour in silica powder drying device is in rarefaction, prevent
Only silica flour coking on appts wall.As the nitrogen containing moisture is entrained with upper outlet of the silica flour through silica powder drying device 1 come
Most of silica flour is filtered to remove into grade one filter 2, secondary filter 3 is entered back into and is filtered to remove micro silica flour, double-filtration
The silica flour that device bottom settles down irregularly returns to silica powder drying device 1, and the nitrogen of the top of secondary filter 3 not silicon powder-containing passes through nitrogen
Gas supercharger 4, pressure is pressurized to 0.4MPa by 0.3MPa, and block 6 is prized to dehydration to remove the water in nitrogen after gas-liquid separator 5
Part, its dew point is less than -70 DEG C, dried nitrogen enters nitrogen buffer tank 7, then enters back into nitrogen heater 8 and carries out, follows
Ring uses.In order to which the nitrogen use level in silica powder drying device 1 is stable, aperiodically made up line 10 supplement fresh nitrogens by nitrogen
Gas.
The present embodiment is removed the silicon powder particle in nitrogen by two-stage filter, not only reclaims silica flour completely, moreover it is possible to anti-
Only silica flour blocks pipeline.During silica powder drying, nitrogen recycles in a closed circulation line, realizes cleaning
Metaplasia production, environmental protection, energy-saving and emission-reduction, reduce production cost, ensuring drying effect while avoiding air, oxygen and other
The entrance system of pollutant.
Exemplified by producing 1.2 ten thousand tons of polysilicon per year, correspondingly the silica powder drying of cold hydrogenation is about that 1200 marks are stood using nitrogen amount
Square rice, using the silica powder drying and nitrogen gas recovering apparatus of the present invention, the mark side rice of recyclable nitrogen about 1000 per hour, during year production
Between by 8000 hours calculate.With a 1000Nm3The expense of/h nitrogen-making devices is made comparisons, and newly-built nitrogen-making device investment is 4,200,000
Member, nitrogen gas recovering apparatus cost of investment are 3,100,000 yuan, save equipment investment cost 420-310=1,100,000 yuan.The energy of newly-built nitrogen
Consume for 0.41*1000*8000=3280000kWh/, and reclaim nitrogen energy consumption as the kWh/ of 0.18*1000*8000=1440000
Year.Based on 0.3 yuan/degree of electricity price, usually save operating cost is energy consumption：（3280000-1440000）* 0.3=552000 yuan/year.
1,100,000 yuan of equipment investment cost can be saved using this nitrogen gas recovering apparatus, it is annual to save 55.2 ten thousand yuan of operating cost.
A kind of preferred embodiment of the above example present invention, it is necessary to it is pointed out here that be that above example is served only for pair
The present invention is further described, it is impossible to is interpreted as limiting the scope of the invention, the technical staff of ability can basis
The content of above-described embodiment makes some nonessential modifications and adaptations.The claimed scope of the invention is by appended claim
Book and its equivalent thereof.
Claims (8)
1. a kind of silica powder drying and nitrogen gas recovering apparatus, including silica powder drying device（1）, silica powder drying device be provided with air inlet, go out
Gas port, charging aperture, discharging opening, it is characterised in that：The retracting device also includes and silica powder drying device（1）The filter of connection,
The gas-liquid separator being connected with filter（5）With gas-liquid separator（5）The dehydration sled block of connection（6）And dehydration sled block（6）Even
The nitrogen heater connect（8）, the dehydration sled block（6）Including two towers for being filled with adsorbent, a tower is used for absorption nitrogen
Nitrogen is dried middle moisture, and another tower is regenerated with regeneration gas to adsorbent, two towers alternately dry and again
Raw, the filter is provided with air inlet, gas outlet, discharge gate, the silica powder drying device（1）Gas outlet and filter enter
Gas port is connected, and the discharge gate of filter is connected with silica powder drying device, and the gas of filter outlet mouth discharge is passed into gas-liquid separation
Device（5）In, gas-liquid separator（5）The gas of middle discharge is passed into dehydration sled block（6）In, prize block through dehydration（6）It is dried dry
Pathogenic dryness body is passed through nitrogen heater（8）, through nitrogen heater（8）Nitrogen after heating is passed through silica powder drying device（1）Air inlet.
2. silica powder drying according to claim 1 and nitrogen gas recovering apparatus, it is characterised in that：The filter and gas-liquid point
From device（5）Between be provided with nitrogen supercharging machine（4）.
3. silica powder drying according to claim 1 and nitrogen gas recovering apparatus, it is characterised in that：The filter includes series connection
Grade one filter together（2）And secondary filter（3）, grade one filter（2）With silica powder drying device（1）Connection, two level mistake
Filter（3）With nitrogen supercharging machine（4）Connection, grade one filter（2）And secondary filter（3）Discharge gate be passed into silica flour and do
Dry device（1）It is interior.
4. silica powder drying according to claim 1 and nitrogen gas recovering apparatus, it is characterised in that：The dehydration sled block（6）With
Nitrogen heater（8）Between be provided with nitrogen buffer tank（7）, block is prized through dehydration（6）Dried drying nitrogen is first passed into nitrogen
Surge tank（7）In enter back into nitrogen heater（8）Heating.
5. silica powder drying according to claim 4 and nitrogen gas recovering apparatus, it is characterised in that：The nitrogen buffer tank（7）
On be connected with fresh nitrogen and make up line（10）.
6. silica powder drying and nitrogen gas recovering apparatus according to claim 1 to 5 any one, it is characterised in that：The silicon
Powder drier（1）Heated using chuck, chuck is provided with middle pressure steam import and medium-pressure steam condensate exports.
7. silica powder drying and nitrogen gas recovering apparatus according to claim 1 to 5 any one, it is characterised in that：The silicon
Powder drier（1）Bottom be provided with nitrogen distributor（9）.
8. silica powder drying and nitrogen gas recovering apparatus according to claim 1 to 5 any one, it is characterised in that：The nitrogen
Hot-air heater（8）For electric heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711347663.0A CN107857270A (en) | 2017-12-15 | 2017-12-15 | A kind of silica powder drying and nitrogen gas recovering apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711347663.0A CN107857270A (en) | 2017-12-15 | 2017-12-15 | A kind of silica powder drying and nitrogen gas recovering apparatus |
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| Publication Number | Publication Date |
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| CN107857270A true CN107857270A (en) | 2018-03-30 |
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ID=61706676
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| CN201711347663.0A Pending CN107857270A (en) | 2017-12-15 | 2017-12-15 | A kind of silica powder drying and nitrogen gas recovering apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108623651A (en) * | 2018-06-19 | 2018-10-09 | 南京肽业生物科技有限公司 | Efficient Peptide systhesis device |
| CN112062883A (en) * | 2020-09-02 | 2020-12-11 | 烟台木赐化工科技有限公司 | Polyethylene wax purification method and purification system |
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| CN207645819U (en) * | 2017-12-15 | 2018-07-24 | 中石化南京工程有限公司 | A kind of silica powder drying and nitrogen gas recovering apparatus |
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| JP2000042327A (en) * | 1998-07-28 | 2000-02-15 | Ibiden Co Ltd | Reproducing system for exhaust gas purification device |
| CN2935034Y (en) * | 2006-01-10 | 2007-08-15 | 高志凯 | Compressed gas residual heat regeneration drying device without gas consumption |
| CN201643947U (en) * | 2009-06-11 | 2010-11-24 | 西安超滤净化工程有限公司 | Zero-discharge gas drying device |
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Cited By (2)
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| CN108623651A (en) * | 2018-06-19 | 2018-10-09 | 南京肽业生物科技有限公司 | Efficient Peptide systhesis device |
| CN112062883A (en) * | 2020-09-02 | 2020-12-11 | 烟台木赐化工科技有限公司 | Polyethylene wax purification method and purification system |
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