Wet denitration process

A wet denitrification and process technology, applied in the field of wet denitrification process, can solve the problems of cost increase

Inactive Publication Date: 2020-04-14
苏州仕净科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar processes need to consume nitrogen oxide oxidizers such as potassium permanganate, sodium hypochlorite, sodium chlorite, ozone and other oxidants to oxidize NO into high-order nitrogen oxides, and then neutralize or reduce them with other more expensive chemicals, resulting in cost Increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]The waste gas (containing NO500ppm, oxygen 4%) after dedusting and desulfurization is input into the oxidizer from the lower part through the first conveying pipe. At 90°C, a part of the oxidized exhaust gas and another part of the unoxidized exhaust gas enter a scrubber together. The monitoring instrument at the gas inlet of the scrubber is linked with the electric intake valve to adjust the flow of exhaust gas entering the oxidizer in real time. When the monitoring instrument detects NO and NO 2 When the molar ratio is less than 1:1, the feedback signal is sent to the electric intake valve to increase the flow of exhaust gas entering the oxidizer; when the monitoring instrument detects NO and NO 2 When the molar ratio is greater than 1:1, the feedback signal is sent to the electric intake valve, and the exhaust gas flow into the oxidizer is reduced or closed; the mass percentage concentration is added to a dispenser: 15% urea, 0.10% EDTA, 0.05% Triethanolamine, 0.05% ...

Embodiment 2

[0029] The waste gas (containing NO800ppm, oxygen 4.5%) after dedusting and desulfurization is input into the oxidizer from the lower part through the first conveying pipe. At 85°C, a part of the oxidized waste gas and another part of the unoxidized waste gas enter a scrubber together. The monitoring instrument at the gas inlet of the scrubber is linked with the electric intake valve to adjust the flow of the exhaust gas entering the oxidizer in real time. When the monitoring instrument detects NO and NO 2 When the molar ratio is less than 1:1, the feedback signal is sent to the electric intake valve to increase the flow of exhaust gas entering the oxidizer; when the monitoring instrument detects NO and NO 2 When the molar ratio is greater than 1:1, the feedback signal is sent to the electric intake valve, and the exhaust gas flow into the oxidizer is reduced or closed; the mass percentage concentration is added to a dispenser: 10% urea, 0.08% ethylenediamine Cobalt, 0.08% of...

Embodiment 3

[0031] The waste gas (containing NO300ppm, oxygen 5%) after dedusting and desulfurization is input into the oxidizer from the lower part through the first conveying pipe. At 90°C, a part of the oxidized exhaust gas and another part of the unoxidized exhaust gas enter a scrubber together. The monitoring instrument at the gas inlet of the scrubber is linked with the electric intake valve to adjust the flow of exhaust gas entering the oxidizer in real time. When the monitoring instrument detects NO and NO 2 When the molar ratio is less than 1:1, the feedback signal is sent to the electric intake valve to increase the flow of exhaust gas entering the oxidizer; when the monitoring instrument detects NO and NO 2 When the molar ratio is greater than 1:1, the feedback signal is sent to the electric intake valve, and the exhaust gas flow into the oxidizer is reduced or closed; the mass percentage concentration is added to a dispenser: 20% urea, 0.20% EDTA ferrous, 0.06% of triethanola...

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Abstract

The invention relates to a wet denitration process, which comprises the following steps: oxidizing part of waste gas subjected to dust removal and desulfurization, mixing the oxidized waste gas and unoxidized waste gas, introducing the mixed waste gas into a washing tower, enabling a molar ratio of NO to NO2 in the mixed waste gas at the inlet of the washing tower to be less than 1:1, and washingthe waste gas in the washing tower by spraying an absorption agent, wherein the absorption agent is urea and an auxiliary agent, and the auxiliary agent comprises one or a plurality of materials selected from a complex, organic alcohol amine and a surfactant. According to the invention, the advantages of small occupied area and low investment of wet denitration are utilized to the greatest extent,and the wet denitration agent cost is reduced as much as possible, wherein NO is subjected to catalytic oxidation by using a low-cost catalyst at an oxidation stage, and the absorption is performed by combining cheap urea and other assistants at an absorption stage, so that the denitration cost is reduced as much as possible on the basis of the assurance of a certain denitration efficiency.

Description

technical field [0001] The invention relates to the fields of environmental protection, chemical industry and materials, in particular to a wet denitrification process. Background technique [0002] my country's energy consumption is dominated by coal, and coal has become the main source of environmental pollution in my country. The combustion of coal is mainly SO 2 , and NOx-based pollutant emission control is urgent. They are the main components of air pollution, which can cause human poisoning, plant damage, acid rain and acid fog, etc., and form photochemical smog with hydrocarbons to cause damage to the ozone layer. In addition, with the rapid increase of automobile consumption, the average annual growth rate of fuel consumption is 6%, and the NOx and SO in the air of big cities 2 and associated pollutant concentrations. In recent years, the urban population exposed to substandard air quality accounted for nearly two-thirds of the statistical urban population. Big c...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/18B01D53/14
CPCB01D53/56B01D53/18B01D53/14B01D2257/404B01D2252/50
Inventor 董仕宏吴倩倩何文
Owner 苏州仕净科技股份有限公司
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