CN207645819U - 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
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- CN207645819U CN207645819U CN201721753467.9U CN201721753467U CN207645819U CN 207645819 U CN207645819 U CN 207645819U CN 201721753467 U CN201721753467 U CN 201721753467U CN 207645819 U CN207645819 U CN 207645819U
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- nitrogen
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- powder drying
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Abstract
The utility model discloses a kind of silica powder drying and nitrogen gas recovering apparatus,Including silica powder drying device,Silica powder drying device is equipped with air inlet,Gas outlet,Feed inlet,Discharge port,The retracting device further includes the filter being connect with silica powder drying device,The gas-liquid separator being connect with filter,The dehydration sled block being connect with gas-liquid separator,The nitrogen heater being connect with dehydration sled block,The dehydration sled block includes two towers for being filled with adsorbent,Two towers are alternately dry and regenerate,The filter is equipped 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 connect with silica powder drying device,The gas of filter outlet mouth discharge is passed into gas-liquid separator,The gas being discharged in gas-liquid separator is passed into dehydration sled block,Dry gas after dehydration sled block drying is passed through nitrogen heater,Nitrogen after nitrogen heater heats is passed through the air inlet of silica powder drying device.
Description
Technical field
The utility model is related to a kind of silica powder drying and nitrogen gas recovering apparatus, are mainly synthesized to the trichlorosilane of polysilicon
When raw material silica flour carry out high temperature drying, belong 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 approval and concern of meeting.Photovoltaic generation has extensively the whole society and particularly acts on, polysilicon as clean reproducible energy
It is the basic material of electronics industry and solar photovoltaic industry.Trichlorosilane is the primary raw material of production polysilicon, and silica flour
It is the important source material for producing trichlorosilane, trichlorosilane is generally generated by silica flour and hydrogen chloride gas in reaction reaction in furnace, and three
Silicon chloride meets water and easily reacts, and silica flour can absorb certain moisture during transport and storage, so must before use
It need ask silica flour that processing is dried.
Currently, silica powder drying uses outer steam disc tubular type and chuck drier.Drier can be passed through steam, hot water or deep fat
It is 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 heating time is 8 ~ 10 hours, and the silica flour after drying is by entering trichlorosilane reactor in silica flour feed bin.
Nitrogen at the top of from drier out is usually directly to be vented, or be discharged into offgas duct, is then sent for eluting column and is absorbed
Processing.This silica powder drying the problem is that：1）Silica flour does not recycle completely, causes the waste of raw material；2）Contain a small amount of silicon
The nitrogen direct emission of powder causes dust pollution production area that cannot reach cleaning and requires；3）The waste of a large amount of nitrogen, wastes energy
Source；4）It uses for a long time, the offgas duct of elution is easy to be blocked by silica flour, influences to produce.
Invention content
The purpose of this utility model is to provide a kind of silica powder drying and nitrogen gas recovering apparatus, to solve the silicon of the prior art
The technical issues of powder silica flour recycling when dry is incomplete and nitrogen wastes.
The utility model adopts the following technical solution：A kind of silica powder drying and nitrogen gas recovering apparatus, including silica powder drying device,
Silica powder drying device is equipped with air inlet, gas outlet, feed inlet, discharge port, and the retracting device further includes connecting with silica powder drying device
The filter that connects, the dehydration being connect with gas-liquid separator sled block, is prized block with dehydration and is connect the gas-liquid separator being connect with filter
Nitrogen heater, dehydration sled block includes two towers for being filled with adsorbent, and a tower is for moisture pair in absorption nitrogen
Nitrogen is dried, another tower regenerates adsorbent with regeneration gas, and two towers are alternately dry and regenerate, the mistake
Filter is equipped with air inlet, gas outlet, discharge gate, and the gas outlet of the silica powder drying device and the air inlet of filter connect, mistake
The discharge gate of filter is connect with silica powder drying device, and the gas of filter outlet mouth discharge is passed into gas-liquid separator, gas-liquid point
It is passed into dehydration sled block from the gas being discharged in device, the dry gas after dehydration sled block drying is passed through nitrogen heater, passes through
Nitrogen after nitrogen heater heating is passed through the air inlet of silica powder drying device.
Nitrogen supercharging machine is equipped 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 connects, and secondary filter is connect with nitrogen supercharging machine, and the discharge gate of grade one filter and secondary filter is passed into silica flour
In drier.
It is equipped with nitrogen buffer tank between the dehydration sled block and nitrogen heater, the drying nitrogen after dehydration sled block drying
It is first passed into nitrogen buffer tank and enters back into nitrogen heater heating.
Fresh nitrogen is connected on the nitrogen buffer tank to make up line.
The silica powder drying device is heated using chuck, and chuck is equipped with middle pressure steam import and medium-pressure steam condensate goes out
Mouthful.
The bottom of the silica powder drying device is equipped with nitrogen distributor.
The nitrogen heater is electric heater.
The utility model has the beneficial effects that：The operational process of the utility model is the nitrogen after nitrogen heater heats
Gas is passed into the vapor that silica flour is taken away in silica powder drying device, so that the silica flour in drier is in rarefaction, simultaneously containing moisture
The nitrogen for carrying some silica flours secretly enters from the top exit of silica powder drying device and is filtered to remove silica flour in filter, filter bottom mistake
The silica flour filtered irregularly returns to silica powder drying device, and the aqueous nitrogen of filter top enters dehydration sled after gas-liquid separator
Block further removes the moisture content in nitrogen, its dew point is made to be less than -70 DEG C, and the nitrogen after drying, which enters back into nitrogen electric heater, to follow
Ring uses, and the industrial silica fume after drying is sent to subsequent processing.The utility model is taken off the silicon powder particle in nitrogen by filter
It removes, not only recycles silica flour completely, moreover it is possible to prevent silica flour from blocking pipeline.During the utility model silica powder drying, nitrogen is one
It is recycled in a closed circulation line, realizes cleanly production, environmental protection, energy-saving and emission-reduction, reduces production cost,
Ensure drying effect while avoiding the entrance system of air, oxygen and other pollutants.Present apparatus overall structure is simple, easily grasps
Make, nitrogen use level is less, has the advantages that environmental protection and energy saving.
Further, nitrogen supercharging machine makes nitrogen pressure stablize, and ensures system continuous operation.
Further, grade one filter can be filtered to remove silica powder drying device discharge nitrogen in most of silica flour, two
Grade filter can be filtered to remove micro silica flour, by double-filtration, further reduce the consumption of silica flour, while realizing dry
The recycling of net nitrogen re-uses.
Further, the use of surge tank and supplement fresh nitrogen ensures that nitrogen use level is stablized in drier, enables the system to
Continuous reliable operation.
Further, using nitrogen distributor, keep nitrogen distribution more uniform, improve the service efficiency of nitrogen, to shorten
Drying time.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of embodiment of the utility model；
Fig. 2 is the schematic diagram of dehydration sled block in Fig. 1.
Specific implementation mode
The utility model is described in detail in the following with reference to the drawings and specific embodiments.
A kind of structure of embodiment of the utility model as shown in Figure 1, the present embodiment silica powder drying and nitrogen gas recovering apparatus
Including silica powder drying device 1, the filter being connect with silica powder drying device 1, the gas-liquid separator being connect with filter 5 and gas-liquid point
The dehydration sled block 6 connected from device 5, the nitrogen heater 8 being connect with dehydration sled block 6, silica powder drying device 1 are equipped with air inlet, go out
Gas port, feed inlet, discharge port, the silica powder drying device 1 are heated using chuck, and chuck is equipped with middle pressure steam import and middle pressure is steamed
Vapour condensate outlet.The bottom of the silica powder drying device 1 is equipped with nitrogen distributor 9.The filter is equipped with air inlet, outlet
Mouth, discharge gate, the gas outlet of the silica powder drying device 1 and the air inlet of filter connect, and the discharge gate and silica flour of filter are dry
Dry device connection, the gas of filter outlet mouth discharge are passed into gas-liquid separator 5, and the gas being discharged in gas-liquid separator 5 is logical
Enter to dehydration and prize in block 6, the dry gas after dehydration sled block 6 is dried is passed through nitrogen heater 8, is heated through nitrogen heater 8
Nitrogen afterwards is passed through the air inlet of silica powder drying device 1.Nitrogen supercharging machine 4 is equipped between the filter and gas-liquid separator 5.Institute
It includes the grade one filter 2 being cascaded and secondary filter 3 to state filter, and grade one filter 2 connects with silica powder drying device 1
It connects, secondary filter 3 is connect with nitrogen supercharging machine 4, and the discharge gate of grade one filter 2 and secondary filter 3 is passed into silica flour
In drier 1.It is equipped with nitrogen buffer tank 7 between the dehydration sled block 6 and nitrogen heater 8, it is dry after dehydration sled block 6 is dried
Dry nitrogen, which is first passed into nitrogen buffer tank 7, enters back into the heating of nitrogen heater 8.It is connected on the nitrogen buffer tank 7 fresh
Nitrogen makes up line 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 regenerates adsorbent with regeneration gas, and two towers are alternately dry and regenerate.Dehydration sled block 6
Schematic diagram as shown in Fig. 2, gas after two tower lower parts in the block are equipped with aqueous nitrogen inlet duct road 61 and regeneration is prized in dehydration arranges
Air pipe 64, dehydration prize two tower top in the block and are equipped with drying nitrogen gas exhaust piping 62 and regeneration gas air inlet pipeline 61.Gas-liquid
The nitrogen being discharged in separator 5 is dried by aqueous nitrogen inlet duct road 61 into a tower, the drying nitrogen after drying
It is 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
It is discharged by gas exhaust pipeline 64 after regenerating after being regenerated.
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, the hot nitrogen of 180 DEG C of pressure 0.3MPa will be heated to through nitrogen heater 8 through silica powder drying
Device lower part nitrogen distributor 9 is passed through in silica powder drying device, and the middle pressure for being passed through 1.0Mpa in 1 external jacket of silica powder drying device simultaneously is steamed
Vapour, nitrogen take away dry silica flour and generate vapor from bottom to top, and the silica flour in silica powder drying device is made to be 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
It is filtered to remove most of silica flour 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 3 top of secondary filter not silicon powder-containing passes through nitrogen
Gas supercharger 4, pressure is pressurized to 0.4MPa by 0.3MPa, to dehydration sled block 6 to remove the water in nitrogen after gas-liquid separator 5
Part, so that its dew point is less than -70 DEG C, the nitrogen after drying enters nitrogen buffer tank 7, then enters back into the progress of nitrogen heater 8, follows
Ring uses.In order to which the nitrogen use level in silica powder drying device 1 is stablized, 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 recycles silica flour completely, moreover it is possible to anti-
Only silica flour blocks pipeline.During silica powder drying, nitrogen is recycled in a closed circulation line, realizes cleaning
Metaplasia production, energy-saving and emission-reduction, reduces production cost at environmental protection, is ensuring drying effect while avoiding air, oxygen and other
The entrance system of pollutant.
For producing 1.2 ten thousand tons of polysilicon per year, the silica powder drying of corresponding cold hydrogenation is about that 1200 marks are vertical using nitrogen amount
Square rice, using the silica powder drying and nitrogen gas recovering apparatus of the utility model, about 1000 mark side's rice of recyclable nitrogen per hour, Nian Sheng
The time is produced by calculating in 8000 hours.With a 1000Nm3The expense of/h nitrogen-making devices is made comparisons, and newly-built nitrogen-making device investment is
4200000 yuan, nitrogen gas recovering apparatus cost of investment is 3,100,000 yuan, saves 420-310=1,100,000 yuan of equipment investment cost.Newly-built nitrogen
The energy consumption of gas is 0.41*1000*8000=3280000kWh/, and it is 0.18*1000*8000=1440000 to recycle nitrogen energy consumption
KWh/.Based on 0.3 yuan/degree of electricity price, usually save operating cost is energy consumption：（3280000-1440000）*0.3=552000
Member/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 above example the utility model, it is necessary to which indicated herein is that above example is only used
It is further described in the utility model, should not be understood as the limitation to scope of protection of the utility model, the technology of ability
Personnel can make some nonessential modifications and adaptations according to the content of above-described embodiment.The utility model requires protection scope
It is defined by the appending claims 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 equipped with air inlet, go out
Gas port, feed inlet, discharge port, it is characterised in that：The retracting device further includes and silica powder drying device（1）The filter of connection,
The gas-liquid separator being connect with filter（5）With gas-liquid separator（5）Block is prized in the dehydration of connection（6）And dehydration sled block（6）Even
The nitrogen heater connect（8）, the dehydration sled block（6）The tower for being filled with adsorbent including two, a tower are used for absorption nitrogen
Nitrogen is dried in middle moisture, another tower regenerates adsorbent with regeneration gas, and two towers are alternately dry and again
Raw, the filter is equipped with air inlet, gas outlet, discharge gate, the silica powder drying device（1）Gas outlet and filter into
Gas port connects, and the discharge gate of filter is connect 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 dry after drying
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 equipped 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 to be passed into silica flour dry
Dry device（1）It is interior.
4. silica powder drying according to claim 1 and nitrogen gas recovering apparatus, it is characterised in that：Block is prized in the dehydration（6）With
Nitrogen heater（8）Between be equipped with nitrogen buffer tank（7）, block is prized through dehydration（6）Drying nitrogen after drying 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. the silica powder drying according to claim 1 to 5 any one and nitrogen gas recovering apparatus, it is characterised in that：The silicon
Powder drier（1）It is heated using chuck, chuck is equipped with middle pressure steam import and medium-pressure steam condensate exports.
7. the silica powder drying according to claim 1 to 5 any one and nitrogen gas recovering apparatus, it is characterised in that：The silicon
Powder drier（1）Bottom be equipped with nitrogen distributor（9）.
8. the silica powder drying according to claim 1 to 5 any one and nitrogen gas recovering apparatus, it is characterised in that：The nitrogen
Hot-air heater（8）For electric heater.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721753467.9U CN207645819U (en) | 2017-12-15 | 2017-12-15 | A kind of silica powder drying and nitrogen gas recovering apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721753467.9U CN207645819U (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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| CN207645819U true CN207645819U (en) | 2018-07-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107857270A (en) * | 2017-12-15 | 2018-03-30 | 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107857270A (en) * | 2017-12-15 | 2018-03-30 | 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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