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

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

technical field [0001] The invention relates to a pollutant emission control method, in particular to a method for controlling dioxin emission in flue gas by using pyrite in the process of incineration and disposal of solid waste. Background technique [0002] The waste incineration process is one of the main sources of dioxins in the environment. Regarding the reduction of dioxin emissions in the flue gas of waste incineration, the main control technologies at home and abroad are: 1. Pre-combustion control, mainly to classify waste, and sort out high chlorine content and some heavy metals; 2. .In-furnace control, by adding sulfur-containing and nitrogen-containing substances and co-firing waste, a good suppression effect can be achieved. At the same time, the waste is controlled by following the "3T" principle, that is, high temperature, long residence time, and good turbulence. 3. Tail flue gas control, for the generated dioxins, add activated carbon or SCR system to cont...

AI Technical Summary

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 ash. The landfill method is mainly used in China to dispose of it. Fly ash-like, which has great potential harm to the environment; second, this method needs to consume a large amount of activated carbon, and the operating cost is relatively high

For some small waste incinerators that do not recover heat, such as medical waste incinerators, incineration with coal is technically unfeasible and economical