CN103088430A - Improved structure of device for eliminating phosphorus oxychloride in phosphorus diffusion furnace - Google Patents
Improved structure of device for eliminating phosphorus oxychloride in phosphorus diffusion furnace Download PDFInfo
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- CN103088430A CN103088430A CN2013100183421A CN201310018342A CN103088430A CN 103088430 A CN103088430 A CN 103088430A CN 2013100183421 A CN2013100183421 A CN 2013100183421A CN 201310018342 A CN201310018342 A CN 201310018342A CN 103088430 A CN103088430 A CN 103088430A
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- induced exhaust
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- phosphorus oxychloride
- exhaust
- phosphorous diffusion
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Abstract
The invention discloses an improved structure of a device for eliminating phosphorus oxychloride in a phosphorus diffusion furnace. The improved structure comprises a buffer tank and an exhaust tube, wherein a furnace tube opening is formed on the rear side wall of a buffer tank body; the front side of the buffer tank body is open and is provided with a sealing door; a flow guide structure is arranged on the sealing door; an exhaust tube opening is formed on the right side wall of the buffer tank body; the exhaust tube is U-shaped; an air inlet is arranged at one end of the exhaust tube; an air outlet is arranged at the other end of the exhaust tube and is connected with an exhaust fan; a furnace tube of the phosphorus diffusion furnace stretches into the buffer tank via the furnace tube opening; the air inlet of the exhaust tube is communicated with the buffer tank via the exhaust tube opening; a furnace crown is arranged at the mouth of the furnace tube and comprises a cylindric quartz crown body with the bottom sealed; an opening extension mouth protruding outwards is arranged at the bottom of the crown body; and a quartz snap ring is welded on the inner wall at the bottom of the crown body. The improved structure utilizes the natural air and atomized dilute ammonia water to quickly cool the tail gas eliminated from the diffusion furnace tube to prevent the teflon coating of the exhaust tube from being molten and simultaneously liquefy phosphorus oxychloride in the exhaust tube quickly.
Description
Technical field
The present invention relates to the manufacturing field of semi-conductor discrete device and solar battery sheet.
Background technology
Phosphorous diffusion is that semi-conductor discrete device, integrated circuit (IC) chip are made the necessary technique of PN junction with solar battery sheet, and the technology that adopts of this road technique is thermal diffusion technology at present.Semi-conductor discrete device is mainly for the manufacture of diode, triode, power device, IGBT and thyristor etc., and these series product have the sales volume of over ten billion at home, and production capacity is very huge.As the purposes of solar battery sheet, silicon chip uses also very extensive on the other hand, and the solar battery sheet of the whole world 70% or more is the use silicon chip as cell piece.Realized the production capacity of 25GW in 2011, it is 6 times of semi-conductor consumption that the polycrystalline consumption reaches 180,000 tons, so the output of sun power is larger than semi-conductor output.Domesticly can produce approximately family more than 120 of silicon chip of solar cell producer, and the producer that can produce the semi-conductor discrete device diffusion sheet also reaches tens.Diffusion furnace each producer that is used for phosphorous diffusion has tens to up to a hundred substantially, and market demand is very large.
The phosphorus diffusing technique of technology maturation mainly contains three kinds in the market: 1, adopt the source diffusion of liquid phosphorus oxychloride; 2, chain type diffusion after employing spraying phosphate aqueous solution; 3, chain type diffusion after the folder layer of employing phosphorus source.It is higher that the method for these three kinds of phosphorous diffusions has production efficiency with the method for liquid phosphorus source diffusion, obtains the surperficial advantage such as good of even, the smooth and diffusion layer of PN junction, therefore uses widest in arealy, and manufacturer generally adopts the method to produce in enormous quantities.The structure iron of phosphorus diffusion method as shown in Figure 1,
The chemical equation of phosphorous diffusion is as follows:
The P that generates
2O
5With pasc reaction, generate silicon-dioxide (SiO under diffusion temperature
2) and phosphorus atom, its reaction formula is as follows:
2P
2O
5+5Si＝5SiO
2+4P↓
Can fully react for phosphorus oxychloride and be filled with a certain proportion of oxygen when must pass into nitrogen in silica tube, phosphorus oxychloride could fully be reacted with silicon, forms at silicon face that one deck phosphorus---silex glass, phosphorus is to the silicon internal diffusion.
The gas that carries phosphorus oxychloride can not be fully after by the diffusion furnace tube of high temperature and pasc reaction, and quite a few unreacted phosphorus oxychloride gas is discharged from boiler tube.And phosphorus oxychloride has following chemistry, physical properties: achromaticity and clarification liquid.Irritant smell.Strongly be fuming.Water absorbability is arranged.Meet water and
EthanolDecompose heating.Relative density (d25) 1.645.
Fusing point1.25 ℃.
Boiling point105.8 ℃.Medium poison, medium lethal dose (rat, per os) 380mg/kg.Tearing property and corrodibility are arranged.Therefore unreacted phosphorus oxychloride can not be let alone to be diffused in air, these residual phosphorus oxychlorides need to be taken away, otherwise operator be endangered huge.Existing diffusion furnace has generally all been installed suction opening in the silica tube exit phosphorus oxychloride has been detached.These extractor fans generally adopt stainless steel or iron sheet to make, but the corrosive nature of phosphorus oxychloride is very strong, and general half a year will be with these induced exhaust corrosion thoroughly to one-year age, and phosphorus oxychloride will leak the operator is produced very large harm.
Summary of the invention
The phosphorus oxychloride remover that technical problem to be solved by this invention just is to provide a kind of phosphorous diffusion stove improves structure, and diffusing capacity in the air of the work-ing life of prolongation induced exhaust, minimizing phosphorus oxychloride obnoxious flavour prevents from the person is produced injury.
for solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of phosphorus oxychloride remover of phosphorous diffusion stove improves structure, it is characterized in that: comprise baffle-box, induced exhaust and sealing radiator, this baffle-box comprises square buffering casing, the inwall of described baffle-box is coated with teflon coatings, described buffering casing rear wall is provided with the boiler tube opening, described buffering casing front side is uncovered and be provided with hermatic door, described hermatic door right side is hinged with the buffering casing, be provided with lock structure between described hermatic door left side and buffering casing, described hermatic door is provided with flow-guiding structure, described buffering casing right side wall is provided with the induced exhaust opening, this induced exhaust is the U-shaped pipe, induced exhaust one end arranges the vertical blast inlet of opening direction and induced exhaust left side pipeline, the induced exhaust the other end is provided with the air outlet higher than blast inlet, and this air outlet opening upwards also connects vacuum fan, and the inner-walls of duct of induced exhaust is provided with teflon coatings, the boiler tube of phosphorous diffusion stove stretches into described baffle-box by described boiler tube opening, the induced exhaust blast inlet is communicated with baffle-box by the induced exhaust opening, the boiler tube oral area is provided with furnace crown, described furnace crown comprises the quartzy material cap of the round shape body of closed bottom, described cap body bottom is provided with an outwardly opening Yan Zui, described cap body bottom interior wall is welded with a quartzy snap ring, and described opening Yan Zui is arranged between snap ring bottom surface and cap body diapire, described induced exhaust bottom opening also is provided with throat structure, the sealing water tank comprises the quad seal casing that the top is uncovered, the dehisce structure of uncovered position, seal case top for opening laterally, the seal case bottom sides is provided with water-in, seal case is provided with the Overflow drainage mouth over against the side of water-in above water-in, described throat structure inserts the described structure of dehiscing, throat structure and the sealing structure and fixing of dehiscing.
As preferably, described hermatic door upper edge, lower edge and the right seal along being provided with sealed strip, described flow-guiding structure is the diversion trench at edge, hermatic door left side, and described lock structure comprises the hook of installing in the middle of diversion trench and cushions limit, casing left side to linking up with buckling of setting.
As preferably, the left side pipeline roof of described induced exhaust is provided with the ammonia spray nozzle of spray ammoniacal liquor.
As preferably, described throat structure outer wall is provided with barb, and the described inner structural wall of dehiscing is installed a circle sealing-ring, and the outside, uncovered upper edge, described seal case top is equipped with clip, described clip and described barb fasten, and described sealing-ring and described throat structure outer wall form sealing.
As preferably, described induced exhaust comprises that cross section is square pipeline body, is provided with a vertical central dividing plate in described pipeline body induced exhaust is separated into the U-shaped structure, and described central dividing plate bottom only arrives the throat structure place.
As preferably, the throat structure bottom of described induced exhaust is provided with below the liquid level that extension board stretches into sealing radiator.
As preferably, be coated with teflon coatings on described throat structure outer wall, described vacuum fan is flow-mixing blower fan, and described sealing radiator is stainless steel structure, and the sealing radiator inwall is provided with teflon coatings.
As preferably, the height of described Overflow drainage mouth is lower than the central dividing plate bottom of U-shaped induced exhaust, higher than the extension board bottom of U-shaped induced exhaust.
As preferably, described sealing radiator water-in is connected with cooling tank by pipeline, and described Overflow drainage mouth connects Waste Water Treatment by pipeline, is loaded with the sodium bicarbonate cooling solution in described cooling tank, be provided with spiral coil cooling tube in cooling tank, described cooling tank bottom is provided with bleed valve.
As preferably, described cap body bottom outer wall is welded with a quartzy handle, and described opening prolongs mouth length and is controlled at 3-5cm, and opening prolongs the mouth internal diameter and is controlled at 0.5-1cm, and described snap ring thickness equals cap body bottom wall thickness.
The present invention connects a baffle-box at the blast inlet end of induced exhaust, the baffle-box hermatic door is provided with flow-guiding structure guiding air and enters, simultaneously, the left side pipeline roof of U-shaped induced exhaust is provided with the ammonia spray nozzle of spray ammoniacal liquor, thereby, can utilize the tail gas of getting rid of in the rapid cooling diffusion furnace tube of natural air and vaporific weak ammonia, prevent from melting the teflon coatings of induced exhaust, make simultaneously phosphorus oxychloride liquefaction rapidly in induced exhaust.
And due to the induced exhaust bottom opening and connect a sealing radiator, the phosphorus oxychloride liquid of liquefaction has been dropped into sealing radiator rapidly in induced exhaust, and in carrying out in sealing radiator and harmless treatment, discharge from the overflow port water port of sealing radiator at last, enter Waste Water Treatment.Thereby reduced the corrosion speed of exhausting system, avoided the leakage of phosphorus oxychloride of gasification and the generation of intoxication accident, thereby in can carrying out phosphorus oxychloride rapidly by system of the present invention and harmless treatment, do not increased the operating load of Waste Water Treatment.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments:
Fig. 1 is the structural representation of phosphorus diffusion method in prior art;
Fig. 2 is overall structure schematic diagram of the present invention;
Fig. 3 is the furnace crown structural representation;
Fig. 4 is the furnace crown bottom schematic view;
Fig. 5 is the baffle-box structural representation;
Fig. 6 is the sealing radiator structural representation;
Fig. 7 is the cooling tank structural representation.
Embodiment
As shown in Figure 2, be the overall structure of the phosphorus oxychloride remover of phosphorous diffusion stove of the present invention, it comprises baffle-box 2, induced exhaust 3 and sealing radiator 4, has also comprised simultaneously a cooling tank 5 shown in Figure 7.
As shown in Figure 3 and Figure 4, be phosphorous diffusion stove boiler tube furnace crown 1, it comprises the quartzy material cap of the round shape body 10 of closed bottom, described cap body 10 bottoms are provided with an outwardly opening and prolong mouth 12, described cap body bottom interior wall is welded with a quartzy snap ring 13, and described opening Yan Zui is arranged between snap ring bottom surface and cap body diapire.Described cap body bottom outer wall is welded with a quartzy handle 11.Described opening prolongs mouth 12 length and is controlled at 3-5cm, and opening prolongs the mouth internal diameter and is controlled at 0.5-1cm.Described snap ring 13 thickness equal cap body 10 bottom wall thickness.
Furnace crown 1 adopts quartzy material, thermostability is high, the opening of quartzy furnace crown bottom sides prolongs the phosphorus oxychloride gas that mouth 12 is used for the boiler tube discharge of release phosphorous diffusion stove, cap body bottom interior wall is welded with a quartzy snap ring 13, snap ring just leaves the width of opening Yan Zui apart from the bottom, boiler tube oral area apical grafting is unlikely to block opening and prolongs mouth 12 on snap ring, facilitated operation at the quartzy handle 11 of furnace crown 1 bottom welding.
as shown in Figure 5, be phosphorous diffusion stove induced exhaust baffle-box 2, it comprises square buffering casing 20, described buffering casing 20 rear walls are provided with the boiler tube opening, the boiler tube of phosphorous diffusion stove stretches into described baffle-box 2 by described boiler tube opening, furnace crown 1 also is positioned at baffle-box 2 and is enclosed within on the boiler tube oral area, described buffering casing 20 front sides are uncovered and be provided with hermatic door 21, described hermatic door 21 right sides are hinged with buffering casing 20, be provided with lock structure between described hermatic door left side and buffering casing, described hermatic door is provided with flow-guiding structure, described buffering casing right side wall is provided with the induced exhaust opening.The blast inlet of induced exhaust 3 has just put in baffle-box by the induced exhaust opening.
Described hermatic door 21 upper edges, lower edge and the right seal along being provided with sealed strip 22.Described flow-guiding structure is the diversion trench 24 at edge, hermatic door left side.On the left of described lock structure comprises the hook 23 of installing in the middle of diversion trench and cushions casing, the limit is to linking up with buckling of setting, and described baffle-box inwall is coated with teflon coatings.
Baffle-box 2 materials are used 312 stainless steels, the size of baffle-box 2 changes according to boiler tube and diffusion furnace size, induced exhaust 3 begins the inner teflon coatings that adopts of induced exhaust 3 with the operation buffer joining place, the Teflon coating thickness is 0.2-10mm, the high temperature that teflon coatings can the highest anti-260 ℃.Three of hermatic door 21 adopt D type sealing materials to seal, and diversion trench 24 places on hermatic door do not add sealed strip 22 and are beneficial to air and enter.
Phosphorous diffusion stove induced exhaust 3 as shown in Figure 2, this induced exhaust 3 is the U-shaped pipe, induced exhaust 3 one ends arrange the vertical blast inlet of opening direction and induced exhaust left side pipeline, the induced exhaust the other end is provided with the air outlet higher than blast inlet, this air outlet opening upwards also connects vacuum fan, and described vacuum fan is flow-mixing blower fan.The left side pipeline roof of described induced exhaust 3 is provided with the ammonia spray nozzle 32 of spray ammoniacal liquor, can realize vaporific spray in induced exhaust.
Described induced exhaust 3 comprises that cross section is square pipeline body 30, is provided with a vertical central dividing plate 31 in described pipeline body induced exhaust is separated into the U-shaped structure.Described induced exhaust bottom opening also is provided with throat structure 33, and described central dividing plate 31 bottoms only arrive throat structure 33 places, and throat structure 33 bottoms of described induced exhaust are provided with extension board 34, and described throat structure 33 outer walls are provided with barb.
U-shaped induced exhaust 3 is from baffle-box 2 combining sites, the inner Teflons that all adopt spray, and coating thickness is 0.2-10mm, and the Teflon spraying is not carried out in the induced exhaust outside, induced exhaust bottom opening constriction is carried out the Teflon spraying, and the U-shaped induced exhaust is installed on the side of diffusion furnace.
Phosphorous diffusion stove induced exhaust sealing radiator 4 as shown in Figure 6, it comprises the quad seal casing 40 that the top is uncovered, the dehisce structure 41 of uncovered position, seal case top for opening laterally, described structure 41 inwalls of dehiscing are installed a circle sealing-ring 44, the outside, uncovered upper edge, top is equipped with clip 45, the seal case bottom sides is provided with water-in 42, and seal case is provided with Overflow drainage mouth 43 over against the side of water-in above water-in.Described sealing radiator 4 is stainless steel structure, and the sealing radiator inwall is provided with teflon coatings.The coating thickness of described teflon coatings is 0.2-10mm.
Wherein, the clip 45 of seal case 40 tops of sealing radiator 4 fastens with described barb, and described sealing-ring 44 forms sealing with described throat structure 33 outer walls.
The extension board 34 of throat structure 33 bottoms of described induced exhaust 3 stretches into below the liquid level of sealing radiator 4, and specifically the length of this extension board 34 is the 5cm left and right.The height of described Overflow drainage mouth 43 is lower than central dividing plate 31 bottoms of U-shaped induced exhaust 3, higher than extension board 34 bottoms of U-shaped induced exhaust 3.
Described sealing radiator 4 water-ins are connected with cooling tank 5 by pipeline, and described Overflow drainage mouth 43 connects Waste Water Treatment by pipeline.
the present invention utilizes the natural wind of baffle-box collection to carry out the waste gas that contains phosphorus oxychloride that rapid cooling diffusion furnace is got rid of, utilize simultaneously water conservancy diversion hermatic door and band having directional exhaust mouth to get furnace crown and prevent that the gaseous state phosphorus oxychloride from revealing and orientation is taken away, utilize in the ammoniacal liquor sprinkling and the phosphorus oxychloride of gaseous state, utilize in the cooling sodium hydrogen carbonate solution that flows and liquid phosphorus oxychloride and innoxious wastewater treatment, utilize the high temperature resistant and erosion resistance of Teflon to prevent the corrosion of air draft pipe, reduced the disclosure risk of phosphorus oxychloride, reduce operator's injury accident, significantly promote the work-ing life of air draft pipe, simultaneously phosphorus oxychloride is carried out harmless treatment, has environment protecting.
Claims (10)
1. the phosphorus oxychloride remover of a phosphorous diffusion stove improves structure, it is characterized in that: comprise baffle-box, induced exhaust and sealing radiator, this baffle-box comprises square buffering casing, the inwall of described baffle-box is coated with teflon coatings, described buffering casing rear wall is provided with the boiler tube opening, described buffering casing front side is uncovered and be provided with hermatic door, described hermatic door right side is hinged with the buffering casing, be provided with lock structure between described hermatic door left side and buffering casing, described hermatic door is provided with flow-guiding structure, and described buffering casing right side wall is provided with the induced exhaust opening; This induced exhaust is the U-shaped pipe, induced exhaust one end arranges the vertical blast inlet of opening direction and induced exhaust left side pipeline, the induced exhaust the other end is provided with the air outlet higher than blast inlet, and this air outlet opening upwards also connects vacuum fan, and the inner-walls of duct of induced exhaust is provided with teflon coatings; The boiler tube of phosphorous diffusion stove stretches into described baffle-box by described boiler tube opening, the induced exhaust blast inlet is communicated with baffle-box by the induced exhaust opening, the boiler tube oral area is provided with furnace crown, described furnace crown comprises the quartzy material cap of the round shape body of closed bottom, described cap body bottom is provided with an outwardly opening Yan Zui, described cap body bottom interior wall is welded with a quartzy snap ring, and described opening Yan Zui is arranged between snap ring bottom surface and cap body diapire; Described induced exhaust bottom opening also is provided with throat structure; The sealing water tank comprises the quad seal casing that the top is uncovered, the dehisce structure of uncovered position, seal case top for opening laterally, the seal case bottom sides is provided with water-in, seal case is provided with the Overflow drainage mouth over against the side of water-in above water-in, described throat structure inserts the described structure of dehiscing, throat structure and the sealing structure and fixing of dehiscing.
2. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 1 improves structure, it is characterized in that: described hermatic door upper edge, lower edge and the right seal along being provided with sealed strip, described flow-guiding structure is the diversion trench at edge, hermatic door left side, and described lock structure comprises the hook of installing in the middle of diversion trench and cushions limit, casing left side to linking up with buckling of setting.
3. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 1 improves structure, it is characterized in that: the left side pipeline roof of described induced exhaust is provided with the ammonia spray nozzle of spray ammoniacal liquor.
4. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 3 improves structure, it is characterized in that: described throat structure outer wall is provided with barb, the described inner structural wall of dehiscing is installed a circle sealing-ring, the outside, uncovered upper edge, described seal case top is equipped with clip, described clip and described barb fasten, and described sealing-ring and described throat structure outer wall form sealing.
5. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 4 improves structure, it is characterized in that: described induced exhaust comprises that cross section is square pipeline body, be provided with a vertical central dividing plate in described pipeline body induced exhaust is separated into the U-shaped structure, arrival throat structure place, described central dividing plate bottom only.
6. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 5 improves structure, it is characterized in that: the throat structure bottom of described induced exhaust is provided with below the liquid level that extension board stretches into sealing radiator.
7. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 6 improves structure, it is characterized in that: be coated with teflon coatings on described throat structure outer wall, described vacuum fan is flow-mixing blower fan, and described sealing radiator is stainless steel structure, and the sealing radiator inwall is provided with teflon coatings.
8. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 7 improves structure, and it is characterized in that: the height of described Overflow drainage mouth is lower than the central dividing plate bottom of U-shaped induced exhaust, higher than the extension board bottom of U-shaped induced exhaust.
9. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 8 improves structure, it is characterized in that: described sealing radiator water-in is connected with cooling tank by pipeline, described Overflow drainage mouth connects Waste Water Treatment by pipeline, be loaded with the sodium bicarbonate cooling solution in described cooling tank, be provided with spiral coil cooling tube in cooling tank, described cooling tank bottom is provided with bleed valve.
10. the phosphorus oxychloride remover of phosphorous diffusion stove according to claim 1 improves structure, it is characterized in that: described cap body bottom outer wall is welded with a quartzy handle, described opening prolongs mouth length and is controlled at 3-5cm, opening prolongs the mouth internal diameter and is controlled at 0.5-1cm, and described snap ring thickness equals cap body bottom wall thickness.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100183421A CN103088430A (en) | 2013-01-17 | 2013-01-17 | Improved structure of device for eliminating phosphorus oxychloride in phosphorus diffusion furnace |
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| CN2013100183421A CN103088430A (en) | 2013-01-17 | 2013-01-17 | Improved structure of device for eliminating phosphorus oxychloride in phosphorus diffusion furnace |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04125922A (en) * | 1990-09-17 | 1992-04-27 | Fuji Electric Co Ltd | Semiconductor closed tube diffusion method and closed tube diffusion equipment |
| US5883919A (en) * | 1997-05-20 | 1999-03-16 | Vanguard International Semiconductor Corporation | Diffusion furnace system for preventing gas leakage |
| CN202347128U (en) * | 2011-12-09 | 2012-07-25 | 东南大学 | Multi-end gas intake and exhaust controllable diffusion furnace tube |
| CN102936752A (en) * | 2012-10-26 | 2013-02-20 | 陈功 | Phosphorus oxychloride remover for phosphorus diffusion furnace |
| CN203007494U (en) * | 2013-01-17 | 2013-06-19 | 陈功 | Phosphorus oxychloride removing device improvement structure of phosphorus diffusion furnace |
-
2013
- 2013-01-17 CN CN2013100183421A patent/CN103088430A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04125922A (en) * | 1990-09-17 | 1992-04-27 | Fuji Electric Co Ltd | Semiconductor closed tube diffusion method and closed tube diffusion equipment |
| US5883919A (en) * | 1997-05-20 | 1999-03-16 | Vanguard International Semiconductor Corporation | Diffusion furnace system for preventing gas leakage |
| CN202347128U (en) * | 2011-12-09 | 2012-07-25 | 东南大学 | Multi-end gas intake and exhaust controllable diffusion furnace tube |
| CN102936752A (en) * | 2012-10-26 | 2013-02-20 | 陈功 | Phosphorus oxychloride remover for phosphorus diffusion furnace |
| CN203007494U (en) * | 2013-01-17 | 2013-06-19 | 陈功 | Phosphorus oxychloride removing device improvement structure of phosphorus diffusion furnace |
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Application publication date: 20130508 |