Method for controlling discharge of dioxins in burning process using sulfurous iron ore

A dioxin and pyrite technology, applied in the field of dioxin emission, can solve the problems of poor economy, great environmental harm and high operating cost, achieve obvious dioxin suppression effect and reduce dioxin emission , the effect of low price

Active Publication Date: 2009-07-22
ZHEJIANG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

Although this method can effectively control the emission of dioxins, there are two main defects: one is that the method itself cannot reduce the total amount of dioxins, and only transfers the dioxins in the gas phase through the adsorption of activated carbon. The fly ash mixed with activated carbon is enriched with high concentration of dioxins. At present, there is no good way to dispose of this fly

Method used

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Embodiment Construction

[0010] The present invention will be described in detail below.

[0011] The waste incinerator in this embodiment is a 400kg / h municipal solid waste pilot incinerator. The pyrite is fed into the furnace with a screw feeder, and the amount of feeding is controlled to keep the concentration of sulfur dioxide in the flue gas at the outlet of the incinerator at 200-400mg / Nm 3 ;

[0012] Compared with the comparative test without using pyrite, the dioxin toxic equivalent concentration of the flue gas in the chimney decreased by 95.3%. The toxic equivalent concentration of dioxins in the fly ash collected by the bag filter dropped by 98%, to only 0.23I-TEQ ng / g, which is lower than the current national standard for dioxin emissions in waste incineration fly ash.

[0013] Finally, it should also be noted that what is listed above are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations

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Abstract

The invention relates to a method for controlling pollutant discharge, and aims to provide a method for controlling dioxin discharge in flue gas by using sulfurous iron ore in the process of burning and processing solid wastes. The method comprises the following steps: throwing the sulfurous iron ore and trash to an incinerator, and controlling the added quantity, and keeping the concentration of sulfuric dioxide in the flue gas at an outlet of the incinerator to between 200 and 400mg/Nm. The dioxin restraining method has a simple process, does not need to change the incinerator and a flue gas processing system, has remarkable effect on dioxin restraining, and simultaneously can reduce the dioxin discharge in the flue gas and fly ash. The adopted sulfurous iron ore has low price and wide resources. In addition, the method has significant application value to solving the problem of the dioxin discharge in the process of burning wastes.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV
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