Synchronous flue gas desulfurization and denitrification process and system for coal-fired power plant

Abstract

The invention discloses a synchronous flue gas desulfurization and denitrification process and system of a coal-fired power plant. The process comprises the following steps: cooling the original flue gas 1 to a certain temperature below 101.88 DEG C to obtain flue gas 2, and introducing the flue gas 2 into a desulfurization and denitrification tower, wherein the flue gas is in sufficiently contact with H2O, dissolved O2, an intermediate product HNO3 and itself attached to the specific surface of foamed ceramic when SO2, NO, NO2 and O2 in the flue gas moves around the pores of the multi-layer foamed ceramic filler, after repeated concatenate chemical reactions, SO2, NO and NO2 in the flue gas are removed, a mixed solution of H2SO4 and HNO3 is separated, and the components of the discharged flue gas 3 are close to normal air components. The system is formed by organically combining a direct cooler, the desulfurization and denitrification tower, a monitoring subsystem and the like. The flue gas desulfurization and denitrification can be simultaneously realized in a set of device (complete equipment), the removal efficiency is high, secondary pollution is avoided, and the mixed solution of chemical raw materials H2SO4 and HNO3 is recovered.

Description

technical field [0001] The invention belongs to the intersection field of energy engineering and environmental engineering, and in particular relates to a simultaneous desulfurization and denitrification process and system for flue gas of a coal-fired power plant. Background technique [0002] Coal-burning pollution is one of the main sources of air pollution in my country. In the primary energy consumption and its composition, coal-burning accounts for about 70%. The largest coal-consuming households in my country are mainly coal-fired power plants. Sulfur dioxide emissions account for about 55% of total industrial emissions, and nitrogen oxide emissions account for about 43% of total industrial emissions. It is estimated that by 2020, my country's northeast, north, southeast regions and the Sichuan Basin SO 2 Emissions reached 30.6 million tons, NO x Emissions amounted to 26.6 million tons. Therefore, reducing and controlling coal combustion, especially coal-fired power ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of desulfurization and denitrification in coal-fired power plants that need to be built separately for desulfurization and denitrification in the current technology, the construction investment is large, the operation and maintenance are complicated, and the operation cost is high. Simultaneous desulfurization and denitrification process and system for coal-fired power plants with low cost, no secondary pollution, and the ability to recycle sulfur and nitrogen resources in flue gas

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