Desulphurization-denitration integrated method and apparatus for low temperature flue gas

Abstract

The invention provides a desulphurization-denitration integrated method for low temperature flue gas. Two or three apparatuses selected from a group consisting of a plasma desulphurization-denitration apparatus, a hydrogen-peroxide catalytic-activation desulphurization-denitration apparatus and an ozone oxidation desulphurization-denitration apparatus are integrated onto a to-be-treated flue. In a scheme which employs the plasma desulphurization-denitration apparatus, the plasma desulphurization-denitration apparatus is arranged at the forefront of the flue; and in the condition that the hydrogen-peroxide catalytic-activation desulphurization-denitration apparatus and the ozone oxidation desulphurization-denitration apparatus both exist, the hydrogen-peroxide catalytic-activation desulphurization-denitration apparatus is located at the front end. According to the method provided by the invention, two or three technologies selected from a group consisting of a plasma desulphurization-denitration technology, a H2O2 catalytic-activation desulphurization-denitration technology and an ozone advanced-oxidation desulphurization-denitration technology are applied in one scheme, and the three desulphurization-denitration technologies can be cooperated and adjusted according different conditions of flue gas, so the removal efficiency of NOx is improved, and desulphurization-denitration operation cost is reduced.

Description

technical field [0001] The present invention relates to a method and device for desulfurization and denitrification, and more specifically, to a method and device for integrating low-temperature flue gas desulfurization and denitrification. Background technique [0002] Nitrogen oxides and sulfur oxides produced by fossil fuel combustion are the main components of air pollutants. They can form acid rain and photochemical smog, and can lead to severe haze weather, which is very harmful to living organisms. Such pollutants have seriously affected human life and health and the living environment, so controlling and eliminating the emissions of nitrogen oxides and sulfur oxides is an urgent need for people. [0003] At present, ammonia selective catalytic reduction (SCR) technology is widely used in flue gas denitrification at high temperature (300-400°C), which requires the temperature of flue gas to be kept at 300-400°C to maintain the activity of the catalyst. Limestone-gyps...

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Problems solved by technology

[0009] The purpose of the present invention is to solve H 2 o 2 When the oxidation flue gas is simultaneously desulfurized and denitrified, the utilization efficiency of the liquid phase feed is low, and the H 2 o 2 Insufficient activity; large amount of ozone oxidized flue gas, incomplete absorption when the amount is low, and unreasonable arrangement of the oxidation process lead to high operating costs for pollutant removal. A method and device for integrating low-temperature flue gas desulfurization and denitrification are provided.

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