Method of desulfuration using powder dust and flue gas from calcium carbide stove

Abstract

The invention provides a method for utilizing calcium carbide furnace dust and flue gas for desulfurization,and belongs to a coal fired boiler desulfurization method. Furnace gases containing dust and flue gases, which are generated during the production of the calcium carbide furnace, are transferred to a furnace hearth above a grate of the coal fired boiler, calcium oxide in the dust makes the over reaction with sulfur dioxide generated when coal burns, and the generated calcium sulfate is discharged along with slag; and, calcium steam in the flue gas enters a boiler flue and undergoes over reaction with sulfur dioxide in the flue, and the generated crystal is removed from the flue gas by an electric dust removing device in the flue. The desulfurization method not only eliminates the pollution of the dust and flue gas generated in the process of producing calcium carbide, but also uses the dust and flue gas to desulfurize the coal fired boiler, so that the method has the advantages of realizing the combat-pollutant-with-pollutant, having good desulfurization effect, and having low desulfurization operation cost, and the desulfurization efficiency is more than 90 percent; moreover, because the dust and flue gas are high in temperature and contain a large amount of coke powder and carbon monoxide, and the dust and flue gas are cofired with coal, the coal is saved.

Description

technical field [0001] The invention provides a desulfurization method for a coal-fired boiler, in particular a method for desulfurizing by using calcium carbide furnace dust and flue gas. Background technique [0002] At present, calcium carbide furnaces for the production of calcium carbide usually adopt an open structure. During the production process, dust splashes everywhere, smoke soars into the sky, and the smell is choking. The dust in the calcium carbide furnace gas contains a large amount of calcium oxide, coke powder, magnesium oxide, etc., and the flue gas contains a large amount of calcium vapor, carbon monoxide, hydrogen, etc. The direct discharge of these pollutants will cause serious environmental pollution. The desulfurization method used in the use of coal-fired boilers such as thermal power plant power boilers is to add a certain proportion of limestone to the coal, and the coal and limestone rise together in the furnace, tumble and burn to form calcium ox...

AI Technical Summary

Problems solved by technology

The disadvantages of this desulfurization method are: first, limestone needs to consume a lot of heat energy during the combustion process, thereby increasing coal consumption; second, limestone will cause wear and tear on the furnace wall of the boiler furnace during the process of rising and tumbling combustion, resulting in increased furnace maintenance times

Although limestone desulfurization measures have been taken, the desulfurization effect is still poor, and activated carbon desulfurization towers are needed to desulfurize the flue gas of coal-fired boilers

The structure of the activated carbon desulfurization tower is complicated, the manufacturing and operation costs are high, and its desulfurization effect is not ideal

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