Chlorine containing high-concentration NOX waste gas treatment method

A waste gas treatment and high-concentration technology, which is applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of reducing production costs, tail gas emissions that cannot meet standards, and oxidation efficiency that decreases over time.

Inactive Publication Date: 2017-04-26
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the defects that the current wet denitrification oxidation process is only carried out in the liquid phase or gas phase, the oxidation efficiency decreases significantly with time, the treated tail gas cannot meet the standard discharge, and cannot be used for high-concentration gas treatment; at the same time, no external oxidant is required , effectively reduce the production cost

Method used

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  • Chlorine containing high-concentration NOX waste gas treatment method
  • Chlorine containing high-concentration NOX waste gas treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A catalyst roasting process produces chlorine-containing high-concentration NOx exhaust gas: the exhaust gas flow rate is 3200Nm 3 / H, NOx concentration is 12500mg / m 3 , Cl 2 The concentration is 2144mg / m 3 , the rest is air, the oxygen content is about 20v%; the exhaust gas temperature is 200°C;

[0066] After the gas is dedusted by the bag 208, the dust concentration at the outlet is 20mg / m 3 . Add a stream of fresh air, the gas flow rate is 3200Nm 3 / H, after the two are mixed, the gas temperature is reduced to 100°C, and it is introduced from the bottom of the packed absorption tower through the induced draft fan. The packed absorption tower is 3-stage packing, and the semiconductor packing is TiO 2 , the wavelength of ultraviolet light is 300-350nm, the absorbent is 20wt% NaOH solution, the temperature of the absorbent is guaranteed to be 45-50°C through steam tracing, the absorbent is in countercurrent contact with the exhaust gas, the effective contact time o...

Embodiment 2

[0070] A catalyst roasting process produces chlorine-containing high-concentration NOx exhaust gas: the exhaust gas flow rate is 15000Nm 3 / H, NOx concentration is 5000mg / m 3 , Cl 2 The concentration is 500mg / m 3 , the rest is air, the oxygen content is about 20v%; the exhaust gas temperature is 100°C;

[0071] After the gas passes through the bag dust removal, the dust concentration at the outlet is detected to be 0. No air is introduced into it, and it is introduced from the bottom of the packed absorption tower through the induced draft fan. The packed absorption tower is 2-stage packing, and the semiconductor packing is TiO 2 , the wavelength of ultraviolet light is 350-400nm, the absorbent is 10wt% NaOH solution, the temperature of the absorbent is guaranteed to be 40-45°C through steam tracing, the absorbent is in countercurrent contact with the exhaust gas, the effective contact time of the gas is 5S, and the gas-liquid ratio is 8:1. The absorption liquid is recycl...

Embodiment 3

[0073] A catalyst roasting process produces chlorine-containing high-concentration NOx exhaust gas: the exhaust gas flow rate is 1500Nm 3 / H, NOx concentration is 25000mg / m 3 , Cl 2 The concentration is 3500mg / m 3 , the oxygen content is 15v%; the exhaust gas temperature is 100°C;

[0074] After the gas passes through the bag dust removal, the dust concentration at the outlet is detected to be 10mg / m 3 . A stream of fresh air is added through the induced draft fan, and the air flow rate is 750Nm 3 / H, the oxygen concentration in the exhaust gas is 19v% at this time, the two gases are mixed in the buffer tank, the gas temperature after mixing is 67°C, the gas is introduced from the bottom of the packed absorption tower, the packed absorption tower is 4-stage packing, and the semiconductor packing is TiO 2 , the wavelength of ultraviolet light is 250-300nm, and the absorber is

[0075] 15wt% NaOH solution, the temperature of the absorbing liquid is guaranteed to be 45-50°C...

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Abstract

The invention provides a chlorine containing high-concentration NOX waste gas treatment method. Chlorine containing high-concentration NOX tail gas, after undergoing bag-type dust removal, is sequentially processed by virtue of a packing absorbing tower and a plate absorbing tower under an ultraviolet light catalysis condition as well as a normal absorbing tower. The packing absorbing tower and the plate absorbing tower adopt wet dechlorination and denitration under the ultraviolet light catalysis condition, and the normal absorbing tower is a protection tower. In treated waste gas, the content of NOX is lower than 240mg/m<3> and the content of Cl2 is lower than 65mg/m<3>, up to national emission demand. The method has the advantages that by adopting ultraviolet catalytic oxidation wet dechlorination and denitration, by catalyzing an oxidation-reduction reaction between chlorine and NO in the waste gas, and by implementing an oxidizing process simultaneously in a gas phase and a liquid phase, the shortcoming of an existing wet method which is not high in denitration efficiency is overcome; a solution is purified after absorption liquid is electrolyzed, and the NOX is finally recovered in the form of nitrate, so that a degree of resource utilization is improved; and the absorption liquid in the system is recycled, so that secondary pollution is prevented.

Description

technical field [0001] The invention provides a high-concentration NO X A waste gas treatment method belongs to the technical field of environmental protection waste gas treatment. Background technique [0002] Raney catalysts used in chemical production produce high concentrations of NO during roasting X Exhaust gas, and NO produced by power plants, nitric acid industry, and electronics industry X The exhaust gas is different, the NO produced by the Raney catalyst during the roasting process X Has a high concentration (usually >5000mg / m 3 ) and contains toxic gases such as chlorine. Currently for high concentrations of NO X At present, the exhaust gas is generally treated by dilution first and then denitrification, while for high concentration NO X At present, there is no mature and efficient dechlorination and denitrification treatment process for waste gas. [0003] Chlorine gas is easily soluble in water and can react with alkali and reducing agent. In industry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/68B01D53/78B01D53/76B01D53/86B01D46/02
CPCB01D53/56B01D46/023B01D53/68B01D53/76B01D53/78B01D53/8628B01D53/8659B01D2251/10B01D2251/304B01D2251/604B01D2251/606B01D2255/20707B01D2255/20776B01D2255/802B01D2259/804
Inventor 王俊俊范珍龙曾凡雪李云钊杜永顺段美荣张宏科华卫琦
Owner WANHUA CHEM GRP CO LTD
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