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A method for simultaneous desulfurization and denitrification by ozone fractional oxidation combined with wet absorption

A graded oxidation, desulfurization and denitrification technology, applied in the field of flue gas desulfurization and denitrification treatment, can solve the problems of high investment and operation costs, difficulty in meeting emission standards, and secondary impact on the environment, so as to save investment and operation costs and low comprehensive economic cost , Reduce the effect of ozone input

Active Publication Date: 2022-04-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned flue gas pollutant treatment technologies still have the following problems: single function, complex system, large footprint, easy to cause secondary impact on the environment, poor adaptability to complex flue gas environments, and difficulty in meeting increasingly stringent emission standards ; High investment and operating costs, difficulty in adapting to different flue gas emission conditions and emission standards, unclear implementation parameters, etc.

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  • A method for simultaneous desulfurization and denitrification by ozone fractional oxidation combined with wet absorption

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Effect test

specific Embodiment 1

[0047] NO x Low initial concentration (less than 200mg / m 3 ), high emission standards (higher than 140mg / m 3 ). Apply technical route 1 as above. Control O 3 / NO molar ratio is around 1.0, ozone initially oxidizes NO x , to ensure a reaction time of at least 0.2s, and to ensure that the flue gas temperature range of the ozone oxidation reaction is 60°C; to oxidize NO in the flue gas to NO 2 , and then pass the oxidized flue gas into the 3 / CaO conventional desulfurization slurry synergistically absorbs SO 2 and NO 2 Gas; in the wet scrubber, the liquid-to-gas ratio is 8L / m 3 , the number of spray tower layers is 2, and the residence time of the flue gas is ≥ 2s; the purified flue gas is discharged from the chimney, and the reacted slurry is processed to produce chemical products such as gypsum and nitrite. Final NO x The removal efficiency is about 30%, SO 2 The removal efficiency is above 90%.

specific Embodiment 2

[0049] NO x Low initial concentration (less than 200mg / m 3 ), high emission standards (higher than 140mg / m 3 ). Apply technical route 1 as above. Control O 3 / NO molar ratio is about 1.1, ozone initially oxidizes NO x , to ensure a reaction time of at least 0.2s, and to ensure that the flue gas temperature range of the ozone oxidation reaction is 130°C; to oxidize NO in the flue gas to NO 2 , and then pass the oxidized flue gas into the 3 / CaO conventional desulfurization slurry synergistically absorbs SO 2 and NO 2 Gas; in the wet scrubber, the liquid-to-gas ratio is 12L / m 3 , the number of spray tower layers is 3, and the residence time of the flue gas is ≥ 2s; the purified flue gas is discharged from the chimney, and the reacted slurry is processed to produce chemical products such as gypsum and nitrite. Final NO x The removal efficiency is about 30%, SO 2 The removal efficiency is above 90%.

specific Embodiment 3

[0051] NO x Low initial concentration (less than 200mg / m 3 ), high emission standards (higher than 140mg / m 3 ). Apply technical route 1 as above. Control O 3 The / NO molar ratio is about 1.2, and the ozone initially oxidizes NO x , to ensure a reaction time of at least 0.2s, and to ensure that the flue gas temperature range of the ozone oxidation reaction is 180°C; to oxidize NO in the flue gas to NO 2 , and then pass the oxidized flue gas into the 3 / CaO conventional desulfurization slurry synergistically absorbs SO 2 and NO 2 Gas; in the wet scrubber, the liquid-to-gas ratio is 16L / m 3 , the number of spray tower layers is 4, and the residence time of the flue gas is ≥ 2s; the purified flue gas is discharged from the chimney, and the reacted slurry is processed to produce chemical products such as gypsum and nitrite. Final NO x The removal efficiency is about 30%, SO 2 The removal efficiency is above 90%.

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Abstract

The invention relates to flue gas desulfurization and denitrification treatment technology, and aims to provide a method for simultaneous desulfurization and denitrification through ozone graded oxidation combined with wet absorption. The method is to add ozone to the flue gas to reduce NO x Carry out oxidation treatment, and then use wet scrubbing and absorption system to absorb the gas products after oxidation reaction; in the process of ozone oxidation treatment, according to the emission standards of flue gas desulfurization and denitrification treatment, the amount of ozone added is controlled in stages. The present invention realizes NO x and SO 2 Efficient synergistic removal, while minimizing ozone input, saving investment and operating costs. It is suitable for various small-capacity boilers, industrial furnaces and other equipment, meets the emission standards of nitrogen oxides, the process transformation is simple, and the desulfurization efficiency is maintained above 90%, which has broad application prospects.

Description

technical field [0001] The invention relates to flue gas desulfurization and denitrification treatment technology, in particular to a method for simultaneous desulfurization and denitrification through ozone graded oxidation combined with wet absorption. Background technique [0002] Limestone / gypsum wet flue gas desulfurization technology (WFGD) is mostly used for flue gas desulfurization, and the desulfurization efficiency of this method can reach more than 90%. However, in order to further meet the requirements of "ultra-low emission standards", it is often necessary to adopt the double-tower design of the wet spray tower and ultra-fine atomization technology. Flue gas denitration technology is mainly divided into reduction denitrification and oxidation denitrification. Among them, denitrification by reduction method includes selective non-catalytic reduction technology (SNCR) and selective catalytic reduction technology (SCR). x Revert to N 2 . Since SNCR and SCR den...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/80B01D53/60B03C3/00
CPCB01D53/75B01D53/76B01D53/80B01D53/60B03C3/00B01D2258/0283B01D2251/104B01D2251/404B01D2251/304Y02A50/20
Inventor 王智化林法伟何勇陈冠益朱燕群徐超群周志军刘建忠
Owner ZHEJIANG UNIV
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