Methylchlorosilane production waste gas incineration process

A technology of methyl chlorosilane and exhaust gas, which is applied in the direction of incinerators, combustion types, combustion methods, etc., can solve the problems of not meeting national standards, heavy alkali washing load, and ineffective cyclone separation, etc., achieving significant environmental protection benefits and saving production costs , to avoid the effect of dioxin

Active Publication Date: 2022-08-05
HUBEI XINGRUI SILICON MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to avoid the production of dioxins, the working temperature of the cyclone separator is above 550 degrees, which requires high material requirements, and the fumed silica produced by incineration has low density and small amount, and the cyclone separation is basically ineffective.
The flue gas from the incinerator contains a large amount of nitrogen and carbon dioxide, so that the absorption efficiency of hydrogen chloride is not high during the falling film absorption, resulting in a large load of alkali washing and high alkali consumption
This process route cannot effectively remove the tail gas dust entrainment and nitrogen oxides, and does not meet the requirements of the national standard, and the tail gas temperature is low and the water content is high, and the high-altitude emission has white visual pollution
Another disadvantage of this process is that due to the low discharge pressure of the exhaust gas in the methyl chlorosilane separation process, generally 0.03-0.05Mpa(G), there is a pressure loss during transportation, and it cannot enter the incineration system smoothly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Production waste gas 1 is transported from the synthesis unit to the gas buffer tank of the incineration unit through a pipeline of 529Nm 3 / h, pressure 0.9Mpa(G), temperature 10℃, intermittent discharge, average discharge per hour of methyl chloride 105Nm 3 , methane 300Nm 3 , nitrogen 97Nm 3 , hydrogen chloride 15Nm 3 , methylchlorosilane 12Nm 3 , enter the incinerator after pressure regulation and incinerate at a temperature of 1150 ℃, and control the pressure of the incinerator at -300Pa (G) through the induced draft fan. Quantitatively add air to the incinerator to support combustion and control the furnace temperature. Because the calorific value of the exhaust gas can support the combustion, only 20kg / h diesel oil is needed as a constant light. After incineration, the high-temperature flue gas is sprayed with urea solution with a mass concentration of 10% through the NCR system at 1180 ° C to remove nitrogen oxides in the flue gas. The flue gas then enters t...

Embodiment 2

[0021] Production waste gas 2 from methyl chlorosilane separation unit waste gas 203Nm 3 / h, pressure 0.03Mpa(G), temperature 5℃, continuous discharge, chloromethane 58Nm in exhaust gas 3 / h, methylchlorosilane 50Nm 3 / h, nitrogen 95Nm 3 / h, transported to the incinerator through the pipeline for incineration at 1150℃, and the pressure of the incinerator was controlled at -300Pa(G) by the induced draft fan. Quantitatively add air to the incinerator to support combustion and control the furnace temperature. Because the calorific value of the exhaust gas cannot support combustion, add 150kg / h diesel as a combustion aid and a permanent light. After incineration, the high-temperature flue gas is sprayed with urea solution with a mass concentration of 8% through the NCR system at 1150 ° C to remove nitrogen oxides in the flue gas. The flue gas then enters the waste heat recovery system, and 2t / h normal temperature process water is added to the system to obtain 1.0MPa(G) steam, a...

Embodiment 3

[0024] Production waste gas 3 self-synthesis unit, 1040Nm 3 / h, pressure 0.5Mpa(G), temperature 10℃, intermittent discharge, average discharge per hour of methyl chloride 250Nm 3 / h, methylchlorosilane 90Nm 3 / h, nitrogen 700Nm 3 / h, transported to the incinerator through the pipeline for incineration at 1150 °C, and the pressure of the incinerator was controlled at -350Pa (G) by the induced draft fan. Quantitatively add air to the incinerator to support combustion and control the furnace temperature. Because the calorific value of the exhaust gas is not enough to support the combustion, add 120kg / h diesel as a combustion aid and a permanent light. After incineration, the high-temperature flue gas is sprayed with urea solution with a mass concentration of 10% through the NCR system at 1150 ° C to remove nitrogen oxides in the flue gas. The flue gas then enters the waste heat recovery system, and 4t / h normal temperature process water is added to the system to obtain 1.1MPa(G...

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PUM

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Abstract

The invention discloses a process and a device for incinerating waste gas produced by methyl chlorosilane. The pressure of the waste gas produced by methyl chlorosilane is adjusted and then sent to an incinerator. After incineration, the flue gas is removed by NCR and then enters a waste heat recovery device. The recovered flue gas enters the quenching tower, enters the hydrochloric acid absorption tower to remove most of the hydrogen chloride after quenching and cooling, and then further removes chlorine through the alkali washing tower, finally removes the dust through the wet electrostatic precipitator, and discharges it at high altitude after heating. The invention has simple technological process, energy saving and environmental protection, and has good application prospect.

Description

technical field [0001] The invention relates to the technical field of methylchlorosilane production, in particular to a technology for waste gas treatment of methylchlorosilane production. Background technique [0002] In the production process of methylchlorosilane, the methylchlorosilane synthesis device and separation device will generate a large amount of waste gas, which is a recognized problem in the industry. The waste gas mainly includes methyl chloride, nitrogen, methylchlorosilane, hydrogen chloride, hydrocarbons and a small amount of silicon powder. This part of the waste gas is generally treated by water washing. Although the operation cost of the water washing process is low, it will produce a large amount of waste water containing salt and oil, and the waste water treatment cost is high, and part of the waste gas does not react with water or is insoluble in water, and is discharged into the atmosphere, causing odor, polluting the environment and harmful to hu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/06F23J15/04F23J15/06F22B1/18
CPCF23G7/06F23J15/04F23J15/06F22B1/18Y02E20/30
Inventor 李少平李书兵高英颜昌锐王清云王文金余传林关小川
Owner HUBEI XINGRUI SILICON MATERIAL CO LTD
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