Desulphurization and denitration apparatus and method based on ozone

Abstract

The invention discloses a desulphurization and denitration apparatus and method based on ozone. The apparatus comprises a flue gas desulphurization and denitration device; the interior of the flue gas desulphurization and denitration device is provided with more than two spraying absorption layers and more than one ozone spray reaction and absorption layer, wherein the ozone spray reaction and absorption layer oxidizes low-valency nitrogen oxide in flue gas into high-valency nitrogen oxide, and the spraying absorption layers absorb sulfur dioxide and nitrogen oxide in the flue gas by using an absorbent and allow absorption products to be formed. The desulphurization and denitration apparatus and method provided by the invention are applicable to desulphurization and denitration of NOX-containing flue gas of a coal-fired boiler, a steel sintering machine, a pelletizing machine, an industrial kiln, etc. and can overcome the problems of high operation cost and complex equipment in conventional desulphurization and denitration process for flue gas.

Description

technical field [0001] The invention relates to a flue gas desulfurization and denitrification device and method, in particular to an ozone-based desulfurization and denitrification device and method. Background technique [0002] China is a major coal-based energy consumer and a major steel producer. In the process of coal burning and smelting, a large amount of sulfur dioxide, nitrogen oxides, dust and other harmful substances will be produced. Among them, sulfur dioxide and nitrogen oxides are the main substances that form acid rain, which will have huge adverse effects on the environment, human body, society and economy. to SO 2 At present, the more mature technology is the limestone-gypsum method, and the removal efficiency can reach more than 95%. In addition, there are technologies such as calcium injection desulfurization in furnace and electron beam desulfurization. The main technologies applied to flue gas denitration are selective catalytic reduction (SCR) and ...

AI Technical Summary

Problems solved by technology

Although this oxidative denitrification method can achieve the purpose of removing nitrogen oxides, the boiler flue gas first reacts with ozone (O 3 ) After the reaction, carry out the alkali treatment process, that is, the oxidation zone is separated from the absorption zone, and the ozone (O 3 ) in an environment with a smoke temperature exceeding 130°C and a dust content of 50-200mg / Nm 3 Under the flue gas conditions, it is easy to decompose, or the adsorbed dust loses its activity, resulting in a decrease in denitrification efficiency and ozone (O 3 ) consumption is too large, increasing the operating cost of the denitrification system

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