Review on incineration compatibility of hazardous waste
Review on incineration compatibility of hazardous waste
Review on incineration compatibility of hazardous waste
Feed compatibility of hazardous waste is the most basic and critical step in incineration disposal process, which is of great significance to the economic and reliable combustion process. Scientific and effective incineration compatibility is conducive to stable operation of incineration system, protection of system equipment, improvement of disposal capacity, pollutant discharge standards, and reduction of operating costs.
一.Scientific and reasonable compatibility purposes
1. Ensure that the calorific value of materials entering the rotary kiln is stable within a certain range to ensure the economy and reliability of system operation.
2. Control the proportion of halide and organic matter to reduce the corrosion of waste heat boiler and flue gas treatment equipment caused by acid pollutants in flue gas produced by combustion.
3. Control the content of halides and heavy metals to ensure the treatment effect of incineration smoke and normal exhaust emissions.
4. Control the content of chlorine-containing organic waste in kiln, and reduce the generation of dioxins in incineration process from the source.
5. Control alkali metal and other low melting point content, control system coking and structure blockage, reduce the impact on refractory materials.
6. Make full use of a variety of feeding channels and stable burning conditions to avoid large instantaneous fluctuations when entering the kiln.
7. Control the moisture stability of materials to ensure the normal drying stage of waste and improve waste disposal efficiency.
二.Mechanism analysis of hazardous waste incineration
The composition and structure of polymer waste are quite complex. In the process of combustion, they can be completely decomposed into low-molecule combustible gas through continuous multistage thermal decomposition reaction, and finally converted into combustion reaction, and release combustion heat.
三.Analysis and discussion of hazardous waste incineration reaction
When burning plastics, rubber, paint and asphalt in the air, the smoke can spread to 30-40 meters in the air. This is because: first, complete gasification is not equal to complete pyrolysis. Solid (liquid) polymer waste can be completely gasification, but complete gasification does not mean that the toxicity of organic pollution can be harmless; Second, thermal decomposition and combustion, conceptually, thermal decomposition and thermal combustion are two completely different reactions, thermal decomposition is endothermic reaction, combustion is exothermic reaction, only a relatively complete decomposition, can achieve a relatively complete combustion; Third, after the complete decomposition of the thick black combustible gas, the exothermic complete combustion reaction can be carried out, and the toxicity of organic pollution can be harmless. Billowing black smoke is caused by incomplete thermal decomposition, uneven combustion oxygen supply and incomplete combustion.
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