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Method for producing granular polysilicon

A technology for manufacturing granules and polysilicon, applied in chemical instruments and methods, silicon, silicon compounds, etc.

Inactive Publication Date: 2016-01-13
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem is that silicon-containing gases can lead to the formation of wall deposits if the wall temperature is too high

Method used

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  • Method for producing granular polysilicon
  • Method for producing granular polysilicon
  • Method for producing granular polysilicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this embodiment (such as figure 1 Schematic), exhaust gas 6 heats the two feed streams 1 and 2. For this purpose, two heat exchangers 3 and 4 are used.

[0051] h 2 The gas stream 1 is not subject to an upper temperature limit, so it is heated in the first heat exchanger 3 at a relatively high temperature level.

[0052] Then, with the help of heat exchanger 4, exhaust gas 6 converts TCS / H 2 The gas mixture (feed gas stream 2) is heated to a temperature of approximately 350°C.

[0053] Overall, 136.9kW of heat can be recovered from the method.

[0054] The exact values ​​in heat exchangers 3,4 can be found in Table 1 and Table 2.

[0055] Table 1 shows data for heat exchanger 3 .

[0056]Table 1

[0057] Exhaust gas inlet temperature

850.00

℃

Exhaust gas outlet temperature

584.12

℃

h 2 Inlet temperature

20.00

℃

h 2 output temperature

800.00

℃

heat transfer

78.50

kW

ΔT log...

Embodiment 2

[0064] In this embodiment (such as figure 2 shown), exhaust gas 6 preheats feed seed 7.

[0065] Only requires a minimum heat of 1.02kW.

[0066] For example, flushing the container with the seeds 7 with the hot exhaust air 6 can transfer heat.

[0067] Table 3 shows the data for this heat exchanger.

[0068] table 3

[0069] Exhaust gas inlet temperature

Embodiment 3

[0071] This example is in image 3 in the icon. It is not the subject of this patent, but is given only in comparison with other solutions.

[0072] Product particles with a mass flow of 37.16kg / h (32.16kg / h net deposit + 5kg / h seed) 8 heating H 2 Feed gas stream 1.

[0073] It is assumed that the granular silicon 8 is cooled from 1000° C. to 900° C. via different cooled internals and on the way to the heat exchanger 3 .

[0074] In heat exchanger 3, 8.22kW of heat is transferred.

[0075] Similar to Example 2, it is conceivable to use product containers, where H is preferred 2 Flow through the hot pellets from the reactor.

[0076] Clearly, more than an order of magnitude more energy can be recovered by using exhaust heat to preheat the feedstock than in the case of waste heat recovery by pellets 8 .

[0077] Table 4 shows the data for this heat exchanger.

[0078] Table 4

[0079] h 2 Inlet temperature

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Abstract

The invention relates to a method for producing granular polysilicon in a fluidized-bed reactor, said method comprising: the fluidization of silicon particles by means of a supplied fluidization gas in a fluidized bed, which is heated to a temperature of 600-1200 DEG C; adding a reaction gas containing silicon; separating silicon on the silicon particles, forming granular polysilicon, which is then discharged from the reactor; and discharging of waste gas. The method is characterized in that discharged waste gas is used in order to heat fluidization or reaction gas, or to heat a cooling water flow in a heat exchanger.

Description

technical field [0001] The invention relates to a method for producing granular polysilicon. Background technique [0002] Polycrystalline silicon granules, or polysilicon granules for short, are an alternative to polysilicon manufactured by the Siemens method. In the Siemens method, however, the polysilicon is produced as cylindrical rods, which must be crushed into so-called chip polysilicon in a time-consuming and costly manner before further processing, and may also require purification; the polysilicon grains have granular product properties And can be used directly as a raw material, for example, for the production of single crystals in the photovoltaic and electronics industries. [0003] Polysilicon granules are produced in fluidized bed reactors. This is carried out by fluidizing the silicon particles by means of a gas flow in a fluidized bed which is heated to a high temperature by means of a heater. A pyrolysis reaction takes place on the hot particle surface b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/027C01B33/029C01B33/03
CPCC01B33/027C01B33/029C01B33/03
Inventor 西蒙·佩德龙
Owner WACKER CHEM GMBH