Method for simultaneous desulfurization and denitrification of dry flue gas

Abstract

The invention discloses a method for simultaneous desulfurization and denitrification of dry flue gas. The method comprises the following steps: collecting flue gas to be treated by adopting a header, introducing ClO2 gas into a pipeline containing the flue gas to be treated or introducing the ClO2 gas and the flue gas to be treated into a mixing tank through the pipeline, and oxidizing NO and SO2 into NO2 and SO3 by ClO2 in a flue or the mixing tank; conveying a powdery deacidification agent into the flue containing treated flue gas, thermally activating the deacidification agent through the high temperature of the flue gas, enabling the deacidification agent to make full contact with the flue gas for a chemical reaction so as to absorb and purify SOx and NOx in the flue gas; feeding the treated flue gas into a dust remover, removing dust generated in the reaction, then discharging the flue gas, and completing desulfurization and denitrification of the flue gas; the method is simple in technological process, low in energy consumption, low in one-time investment, low in safety risk and free of ammonia leakage risk, heating equipment is not needed in the technological process, and the risks of fire disasters, explosions and the like are low; the method is suitable for market and industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a method for simultaneous desulfurization and denitrification of dry flue gas. Background technique [0002] With the continuous development and progress of the economy and society, the environmental pollution caused by the energy consumption structure is becoming more and more serious. Among them, the greenhouse effect, acid rain, and atmospheric smoke and dust pollution have caused serious harm to people's production and life. In China, SO released from coal combustion 2 Accounting for 85% of total emissions, NO x Accounting for 60% of the total emissions, the acid rain caused by the two accounts for 82% of the total acid rain. According to relevant studies, the economic loss caused by acid rain pollution in my country is about 500 billion yuan per year. [0003] Common flue gas desulfurization technologies include wet method (lime / limestone method, d...

AI Technical Summary

Problems solved by technology

In fact, two steps are used for wet desulfurization and denitrification. Not only the process is long, but also the wet equipment occupies a large area and the operation steps are cumbersome. In addition, O 3 The generator has high operating cost, O 3 Disadvantages such as low utilization rate and secondary pollution (nitrate wastewater)

The Chinese utility model patents with the announcement numbers CN2712446Y and CN2746971Y respectively proposed a "flue gas desulfurization and denitrification device" and "desulfurization and denitrification integrated flue gas purification tower", but the desulfurization and denitrification equipment are all large packing devices, and Directly using ammonia solution to absorb nitrogen oxides in flue gas not only greatly increases the resistance of the entire desulfurization and denitrification equipment, but also cannot effectively remove nitrogen oxides in flue gas

The reason is NO x NO accounts for more than 90% in the medium, and NO is insoluble in water, so it is difficult to remove NO by simple washing method

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