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System for recovering vented hydrogen gas of cold-hydrogenated silicon powder charging system and method

A technology of cold hydrogenated silicon powder and feeding system, which is applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems of increasing the load of exhaust gas washing process, waste of hydrogen, and poor system operation, and achieves reduction of hydrogen consumption. , The effect of reducing hydrogen consumption and small investment

Active Publication Date: 2019-06-07
内蒙古通威高纯晶硅有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The direct discharge of hydrogen will cause great waste, and at the same time, a large amount of depressurized hydrogen will also increase the load of the exhaust gas washing process, making the entire system run poorly

Method used

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  • System for recovering vented hydrogen gas of cold-hydrogenated silicon powder charging system and method
  • System for recovering vented hydrogen gas of cold-hydrogenated silicon powder charging system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present invention includes a silicon powder filter I2 and a silicon powder filter II3 which are sequentially connected to the silicon powder feed tank 1 through pipelines, and a hydrogen compressor is connected to the gas outlet of the silicon powder filter II3. A buffer tank 4 is arranged between the hydrogen compressor and the silicon powder filter II3.

[0032] The silicon powder filter includes a tank body 11, which is cylindrical and has a conical collecting bucket 12 at the bottom. Described tank body 11 is provided with horizontal clapboard 15; Described clapboard 15 is provided with several filter cores 16; An air outlet 14 is arranged above the plate 15 ; and the end of the tank body 11 having the air outlet is provided with a blowback outlet 17 , and the end with the air inlet 13 is provided with a silicon powder outlet 18 . The filter element 16 is cylindrical, one end is open and the other end is closed; the open end is towards the gas outlet end of the...

Embodiment 2

[0035] Such as figure 1 , figure 2 As shown, the present invention includes a silicon powder filter I2 and a silicon powder filter II3 connected in sequence to the silicon powder feed tank 1 through pipelines, and a hydrogen compressor is connected to the gas outlet end of the silicon powder filter II3. A buffer tank 4 is arranged between the hydrogen compressor and the silicon powder filter II3. A branch pipe is provided between the silicon powder filter I2 and the silicon powder filter II3, and the branch pipe is connected to the waste gas washing system 5 . A valve I6 is arranged on the branch pipe, and a valve II7 is arranged between the silicon powder filter II3 and the branch pipe. Branches are existing pipelines, and it is generally not necessary to dismantle the original pipelines in the actual production process. And when the first line of valve II7 fails, the line can be switched to allow the entire system to continue running, avoiding shutdowns for maintenance. ...

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PUM

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Abstract

The invention discloses a system for recovering vented hydrogen gas of a cold-hydrogenated silicon powder charging system and a method. The system comprises a silicon powder filter I and a silicon powder filter II which are sequentially connected with a silicon powder charging tank by using a pipeline, wherein a gas outlet end of the silicon powder filter II is connected with a hydrogen gas compressor; and a branch pipe is arranged between the silicon powder filter I and the silicon powder filter II and is connected to an exhaust gas leaching system. According to the system and the method, only one silicon powder filter and corresponding pipelines are required to be additionally arranged, and thus, the investment is small. The consumption of hydrogen gas is lowered, and the hydrogen gas can be recovered by about 357000Nm<3> / year according to a designed operating volume.

Description

technical field [0001] The invention relates to a system and method for recovering vented hydrogen in a cold hydrogenation silicon production process. Background technique [0002] In the process of preparing silicon powder by cold hydrogenation, the silicon powder feeding tank needs to accept silicon powder again after the silicon powder is pushed out. In this process, the pressure in the silicon powder feeding tank needs to be released from 2.8Mpa.G to slightly positive pressure, and this part of the gas is hydrogen. In the existing process, the depressurized hydrogen is sent to the waste gas washing process for treatment and then discharged to the atmosphere. [0003] The direct discharge of hydrogen will cause great waste, and at the same time, a large amount of depressurized hydrogen will also increase the load of the exhaust gas washing process, making the entire system run poorly. Contents of the invention [0004] In view of this, the present invention provides a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/00B01D46/24B01D46/42B01D50/00C01B33/021
CPCY02P20/129
Inventor 钟建伟甘居富游书华彭中王亚萍
Owner 内蒙古通威高纯晶硅有限公司