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Fumed silica tail gas treatment system and treatment method thereof

A gas-phase white carbon black and tail gas treatment technology, applied in chemical instruments and methods, chlorine/hydrogen chloride purification, chlorine/hydrogen chloride, etc., can solve the problems of large environmental pollution, unstable by-products, etc., and achieve high economic value-added, flexible sex high effect

Pending Publication Date: 2020-08-07
宁夏福泰硅业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of large environmental pollution and unstable by-products existing in the prior art, the present invention discloses a gas-phase white carbon black tail gas treatment method

Method used

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  • Fumed silica tail gas treatment system and treatment method thereof

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Embodiment approach 1

[0035] This embodiment, as the basic embodiment of the present invention, discloses a gas phase white carbon black tail gas treatment system, the specific structure is as follows figure 1 As shown, along the flow direction of the air flow, there are sequentially connected a booster fan 2, a bag filter 1, a synthesis furnace 3, a cooling device 4, a drying tower 5, a gas compressor 6, a high-pressure buffer tank 7 and a pressure swing adsorption tower group 8 , wherein the upper and lower sides of the bag filter 1 are respectively provided with an exhaust port and a solid material discharge port, and its side wall is provided with an air inlet, which is connected to the booster fan 2, and the solid material discharge port is connected to Corresponding dust recovery equipment;

[0036]The upper part of the synthesis furnace 3 is provided with a plurality of feed ports, and each feed port is airtightly connected with the corresponding gas source, and the bottom thereof is a disch...

Embodiment approach 2

[0041] This embodiment, as another preferred embodiment of the present invention, discloses a gas phase white carbon black tail gas treatment method, which includes the following steps:

[0042] S1. Incorporate the exhaust gas into the booster fan. After increasing the fan booster, the exhaust gas is passed into the bag filter after being pressurized. The filter bag in the bag filter is recommended to be made of PTFE-coated Flumes needle felt. filter bags;

[0043] S2, the tail gas after the dedusting of step S1 is passed into the synthesis furnace, and chlorine and hydrogen are passed into the synthesis furnace simultaneously, according to the content change of chlorine in the tail gas, under standard conditions, the volume ratio of the hydrogen and chlorine that is passed into is 1.05:1, and the above-mentioned gases are fully mixed and then ignited in the synthesis furnace to make it continue to burn. After full combustion, all the chlorine in the tail gas and the chlorine ...

Embodiment approach 3

[0047] Present embodiment is another preferred embodiment of the present invention, and it discloses a kind of gas-phase white carbon black tail gas treatment method, and it comprises the following steps:

[0048] S1. Incorporate the exhaust gas into the booster fan. After increasing the fan booster, the exhaust gas is passed into the bag filter after being pressurized. The filter bag in the bag filter is recommended to be made of PTFE-coated Flumes needle felt. filter bags;

[0049] S2, the tail gas after the dedusting of step S1 is passed into the synthesis furnace, and chlorine and hydrogen are passed into the synthesis furnace simultaneously, according to the content change of chlorine in the tail gas, under standard conditions, the volume ratio of the hydrogen and chlorine that is passed into is 2:1, and the above gas is fully mixed and then ignited in the synthesis furnace to make it continue to burn. After full combustion, all the chlorine in the tail gas and the chlori...

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Abstract

The invention discloses a fumed silica tail gas treatment system and a treatment method thereof. The system comprises a bag-type dust collector, a synthesis furnace, a cooling device, a drying tower,a gas compressor, a high-pressure buffer tank and a pressure swing adsorption tower group which are connected in sequence. Toxic chlorine in the tail gas is completely converted into hydrogen chloridegas in a mode of mixed combustion of the tail gas, the chlorine and excessive hydrogen at high temperature, then the high-concentration compressed hydrogen chloride gas is separated through the stepsof dehydration, pressure swing adsorption and the like, and meanwhile, the emptied tail gas is only nitrogen and oxygen. Compared with the prior art, the method has the following advantages: the discharged tail gas cannot generate environmental pollution, and meanwhile, a large amount of pickling waste liquid cannot be generated, so that the environmental protection pressure of an enterprise is greatly reduced; and the product of the invention is hydrogen chloride gas, and compared with hydrochloric acid with unstable concentration, the hydrogen chloride gas has higher economic value and useflexibility, and the economic benefit of enterprises can be improved.

Description

technical field [0001] The invention relates to the technical field of polysilicon production, in particular to a gas phase white carbon black tail gas treatment system and a treatment method thereof. Background technique [0002] The current gas-phase silica production process will produce a large amount of tail gas containing hydrogen chloride gas that needs to be treated. In the prior art, the following steps are generally used for the above-mentioned tail gas: 1. The tail gas of gas-phase silica is sprayed with hydrochloric acid to remove the tail gas 2. The absorption of hydrogen chloride in the tail gas is generally divided into a multi-stage packed absorption tower that uses dilute hydrochloric acid to absorb hydrogen chloride; 3. The tail gas is washed with water, and the water washing tower uses water as the absorbent to absorb hydrogen chloride; 4. The alkali washing tower uses hydrogen oxidation Sodium is used as an absorbent to absorb chlorine in the tail gas and...

Claims

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Application Information

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IPC IPC(8): C01B7/01C01B7/07
CPCC01B7/012C01B7/0706Y02P20/129
Inventor 刘倩李存鑫张辉丁乐
Owner 宁夏福泰硅业有限公司
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