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Device and method for electro-dynamic migration recovery and cyanogen-containing waste gas purification

An exhaust gas treatment device and electric power technology, applied in chemical instruments and methods, separation methods, preparation/purification/separation of hydrogen cyanide, etc., can solve problems such as secondary pollution and large consumption of chemicals

Active Publication Date: 2014-05-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN 201586472 U discloses a cyanide-containing waste gas treatment device. The cyanide-containing waste gas is fully absorbed after being mixed with caustic soda solution twice. Compared with the operation in the prior art, the absorption rate is greatly increased and the caustic soda consumption is reduced. , improve the level of safe production, but also face the consumption of a large amount of chemical agents, and produce secondary pollution, and the ions cannot be recycled

Method used

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  • Device and method for electro-dynamic migration recovery and cyanogen-containing waste gas purification
  • Device and method for electro-dynamic migration recovery and cyanogen-containing waste gas purification
  • Device and method for electro-dynamic migration recovery and cyanogen-containing waste gas purification

Examples

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Effect test

Embodiment 1

[0025] use as figure 1 A device for recovering and purifying cyanide-containing waste gas by electrodynamic migration is shown to recover HCN in carbon fiber cyanide-containing waste gas. The concentration of HCN in the exhaust gas is 30mg / m 3 , the flow rate is 100m 3 / h, the residence time is 10min, after passing through the device of electrodynamic migration recovery and purification of cyanide-containing waste gas, HCN gas with a purity of 98%-99.5% can be obtained in the HCN recovery storage tank, and the gas discharged after being treated by the cathode electro-Fenton device The content of HCN in the gas is less than 0.05mg / Nm 3 , lower than the maximum allowable concentration of HCN national standard is 0.3mg / Nm 3 . Among them, the size of the electric exhaust gas treatment device is 3m*4m*10m, the anode is a titanium ruthenium-plated mesh electrode, the cathode is a stainless steel mesh electrode, and the inert filler is an active ceramic ball.

Embodiment 2

[0027] Two sets of electric waste gas treatment devices are used in series to recover HCN in calcium carbide furnace gas. The operation steps and HCN recovery principle are the same as those in Example 1. The concentration of HCN in the exhaust gas is 2.45g / m 3 , the flow rate is 1000m 3 / h, the furnace gas enters the two-stage electric waste gas treatment device in two ways, and the residence time is 20 minutes. After passing through the device for electric power migration recovery and purification of cyanide-containing waste gas, the purity of 97%-98.5% can be obtained in the HCN recovery storage tank. HCN gas, the content of HCN in the discharged gas after being treated by the cathode electro-Fenton device is less than 0.25mg / Nm 3 , lower than the maximum allowable concentration of HCN national standard is 0.3mg / Nm 3 . Among them, the size of each stage of electric exhaust gas treatment device is 5m*4m*10m, the anode is titanium ruthenium plated mesh electrode, the c...

Embodiment 3

[0029] In Example 3, two sets of electric waste gas treatment devices are used to recover HCN in calcium carbide furnace gas in series. The operation steps and HCN recovery principle are as follows: Figure 4 shown. The concentration of HCN in the exhaust gas is 2.45g / m 3 , the furnace gas enters the two-stage electric waste gas treatment device in two ways, and the residence time is 20 minutes. After passing through the device for electric power migration recovery and purification of cyanide-containing waste gas, the gas contains 24.5 mg / m after the HCN absorption and recovery of HCN in the first stage 3 , and then after the second stage of absorption, the content of HCN in the discharged gas is lower than 0.24mg / Nm 3 , reaching a maximum allowable concentration lower than the HCN national standard of 0.3mg / Nm 3 requirements.

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Abstract

The invention discloses a device and a method for electro-dynamic migration recovery and cyanogen-containing waste gas purification. The device consists of an electric waste gas treatment device and a cathode electro-Fenton device, wherein the electric waste gas treatment device consists of an anode chamber and a cathode chamber which are separated by an ionic selective permeable membrane, a voltage is applied to two ends of the device, the waste gas enters the cathode chamber and is converted into CN<->, the CN<-> penetrates an ion exchange membrane and enters the anode chamber under the action of electric migration, and high-concentration HCN gas is obtained in the anode chamber, collected by a HCN recovery storage tank and reused. The device can be used for recovering the HCN in various cyanogen-containing waste gases (such as carbon fiber tail gas, allyl cyanide tail gas, calcium carbide furnace gas, coke oven gas and yellow phosphorus tail gas).

Description

technical field [0001] The invention relates to a device and a method for recovering and purifying waste gas containing cyanide by electrodynamic migration. Background technique [0002] The removal methods of HCN are mainly absorption method, adsorption method and combustion method. Several methods for removing HCN waste gas have their own characteristics, and the advantages and disadvantages of each treatment method and the objects they are suitable for are different. When dealing with HCN tail gas produced in actual production, factors such as HCN concentration, other components contained in tail gas and emission methods, existing equipment and cost of treatment methods will all affect the choice of HCN removal method. When using the adsorption method, some gas components will affect the adsorption of activated carbon to HCN. For example, when the exhaust gas contains a lot of water vapor, there is a competitive adsorption phenomenon between water vapor and HCN, which m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/74B01D53/78B01D53/54C01C3/04
Inventor 吴祖成廖文
Owner ZHEJIANG UNIV
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