Deep deacidification and white smoke removing system and method for flue gas of garbage power plant

Abstract

The invention discloses a deep deacidification and white smoke removing system and method for flue gas of a garbage power plant. The system comprises a temperature reducing tower. The flue gas is introduced into a wet tower after preliminary deacidification by means of a semi-drying method, first deacidification is completed in a spraying bin, and then the flue gas is introduced into a slurry tankfor a gas-liquid reaction to complete second deacidification so that the deacidification efficiency of the flue gas can reach 90% or above; at the same time, the flue gas is condensed and dehumidified in a dehumidifying layer to reduce the water content in the flue gas, so that the two processes including deacidification and white smoke removing are integrally completed in the wet tower; during spraying deacidification, a certain guarantee is provided for the reaction time of spraying slurry and the flue gas, the slurry is in full contact with the flue gas, the demand for the height of a tower body is not high, and the energy consumption of the system is reduced; the flue gas is introduced into the slurry tank through a descending pipe after being subjected to spraying deacidification inthe spraying bin, acid gas removal and deep dust removal are further carried out through a slurry reaction, and ultra-low emission requirements are met.

Description

technical field [0001] The invention relates to a flue gas deacidification and whitening system, in particular to a system and method for deep deacidification and whitening of flue gas from a waste power plant. Background technique [0002] As environmental protection requirements become more and more stringent, NOx, SOx, HCl, dust, Hg, dioxins and other pollutants in the flue gas need to be discharged up to the standard, and the white smoke at the chimney outlet needs to be treated. Waste incineration plants The traditional method is semi-dry method + dry method + flue gas de-whitening system to achieve double effects. The semi-dry method + dry method deacidification mode adopted by waste incineration plants can meet the national standard (sulfur dioxide 80mg / Nm 3 , hydrogen chloride 50mg / Nm 3 ), but for the design value of local regulations for ultra-low emissions (sulfur dioxide 10mg / Nm 3 , hydrogen chloride 5mg / Nm 3 ) is difficult to achieve. [0003] In addition, be...

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Problems solved by technology

[0002] As environmental protection requirements become more and more stringent, NOx, SOx, HCl, dust, Hg, dioxins and other pollutants in the flue gas need to be discharged up to the standard, and the white smoke at the chimney outlet needs to be treated. Waste incineration plants The traditional method is semi-dry method + dry method + flue gas de-whitening system to achieve double effects. The semi-dry method + dry method deacidification mode adopted by waste incineration plants can meet the national standard (sulfur dioxide 80mg / Nm 3 , hydrogen chloride 50mg / Nm 3 ), but for the design value of local regulations for ultra-low emissions (sulfur dioxide 10mg / Nm 3 , hydrogen chloride 5mg / Nm 3 ) is difficult to achieve

[0003] In addition, because the absorption liquid in the conventional deacidification system is a dispersed phase during spraying, the SO in the flue gas 2 It is also the dispersed phase, and the deacidification method of the dispersed relative dispersed phase requires that the residence time of the flue gas in the tower should be as long as possible if it is to achieve high efficiency (the tower body needs to be high and the number of spray layers is large) and The spray volume should be large (requires a large liquid-gas ratio), and the potential energy work done by the system during the deacidification of the flue gas is large, resulting in a large power of the absorption liquid circulation pump and high energy consumption

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