Dedusting and denitration system for thermal power plant fire coal smoke

Abstract

The invention provides a dedusting and denitration system for thermal power plant fire coal smoke, which lowers denitration cost while ensuring that the system efficiently denitrate. The dedusting and denitration system is characterized in that heat exchangers comprise a heat exchanger I and a heat exchanger II; a coal economizer is provided with two smoke outlets, wherein one smoke outlet is ledto the high-temperature inlet of the heat exchanger I, and the other smoke outlet is led to the high-temperature inlet of the heat exchanger II; the high-temperature outlet of the heat exchanger I isconnected with the inlet of a smoke flow regulation valve; the outlet of the smoke flow regulation valve is connected with one inlet of a smoke mixer; the high-temperature outlet of the heat exchanger II is connected with the other inlet of the smoke mixer; the outlet of the smoke mixer is connected with the inlet of an efficient dust remover; the outlet of the efficient dust remover is connectedwith the low-temperature inlet of the heat exchanger II; the low-temperature outlet of the heat exchanger II is connected with the inlet of an SCR (Silicon Controlled Rectifier) reactor; the outlet of the SCR reactor is connected with an air preheater; and the low-temperature inlet to the low-temperature outlet of the heat exchanger I is low-temperature liquid.

Description

technical field [0001] The invention relates to the technical field of flue gas dust removal and denitrification systems, in particular to a coal-fired flue gas dust removal and denitrification system in a thermal power plant. Background technique [0002] NOx is one of the main sources of air pollution, and there are many different forms of NOx: N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 , where NO and NO 2 are important air pollutants. They are easily discharged into the atmosphere to form acid rain and photochemical smog, destroy the ozone layer and cause the greenhouse effect, which has brought serious harm to the natural environment and human health. 70% of my country's NOx emissions come from the direct combustion of coal, and the power industry is a large coal-burning household in my country. Therefore, as a key industry, thermal power plants must control NOx emissions. [0003] At present, technologies for controlling NOx emissions include: 1. Fu...

AI Technical Summary

Problems solved by technology

However, due to the high ash content of the flue gas produced by burning coal, the concentration of fly ash in the flue gas at the outlet of the economizer is high, which directly causes the wear of the catalyst in the SCR reactor, pore blockage and poisoning, which reduces the denitrification efficiency of the system and the catalyst. Therefore, in order to maintain the efficient denitrification of the system, the expensive catalyst needs to be replaced frequently, which greatly increases the cost of denitrification

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