Multiple reaction integrated process for desulfuizing from fume by dry method and its system

Abstract

A multiple reactions integrated process for desulfurizing from the fume by dry method includes such steps as spraying limestone powder in high-temp combustion box from its top to decompose calcium carbonate into calcium oxide and CO2, absorbing SO2 from fume by partial calcium oxide to generate calcium sulfate, spraying water to activate calcium oxide to transform partial calcium oxide to calcium hydroxide and absorb SO2 from fume to generate calcium sulfite, and using the residual calcium hydroxide and calcium oxide to desulfurize the fume in desulfurizing tower. Its system is composed of limestone powder sprayer, moistening flue, desulfurizing tower, external electric duster, draught blower and chimney.

Description

technical field [0001] The invention relates to a flue gas desulfurization technology of a coal-fired power station, in particular to a multi-reaction integrated dry flue gas desulfurization process and a system thereof. Background technique [0002] my country is one of the few countries in the world that use coal as the main energy source. Coal has always accounted for more than 70% of the primary energy production and consumption in my country. It is imperative to control the pollution caused by sulfur dioxide emissions. [0003] At present, the technologies used for flue gas desulfurization in coal-fired power plants generally include wet, semi-dry and dry desulfurization. Calcium spraying in the furnace is a dry desulfurization technology developed in the 1960s. Because it uses cheap limestone, calcium carbonate CaCO 3 As a desulfurizer, it has the characteristics of low investment and simple process. It was valued and developed by Europe, the Unit...

AI Technical Summary

Problems solved by technology

However, the circulating fluidized flue gas desulfurization method also has the following disadvantages: the desulfurizing agent used in this method is high-quality calcium hydroxide Ca(OH) 2 Or calcium oxide CaO that needs to be processed by the digestive system. On the one hand, due to high-quality calcium hydroxide Ca(OH) 2 Or the price of calcium oxide CaO is also high, which greatly increases the operating cost of the entire desulfurization system; on the other hand, due to the addition of a digestive system, the structure of the entire desulfurization system is complicated, the operating cost is high, and the surface activity of slaked lime particles is not easy to guarantee

In addition, since calcium hydroxide Ca(OH) 2 Or calcium oxide CaO has certain hazards to human health. Therefore, when using it as a desulfurizer, it is necessary to ensure that the transportation process and the desulfurization system have good sealing and safety measures, which makes the system structure more complicated and the operating cost cannot be reduced.

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