Method for treating hazardous waste by utilizing oxygen carrier to assist combustion in rotary kiln

Abstract

The invention discloses a method for treating hazardous waste by utilizing an oxygen carrier to assist combustion in a rotary kiln. The method comprises the following steps that the oxygen carrier andthe hazardous waste are reasonably matched and then added into a main combustion chamber of the rotary kiln, the uniformity of oxygen distribution in the main combustion chamber is improved accordingto the oxygen absorption and release characteristics and the catalytic performance of the oxygen carrier, the hazardous waste and oxygen are fully mixed in time and space, the combustion efficiency is improved, and generation and emission of harmful gases in the main combustion chamber are reduced; ash slag which contains the oxygen carrier and is discharged from the rotary kiln passes through aslag cooler and then enters a separation device, the oxygen carrier is separated from the ash slag and then conveyed to the rotary kiln, and cyclic utilization of the oxygen carrier is achieved; and the ash slag is conveyed out for melting treatment. By means of the method, sufficient combustion and complete combustion of the hazardous waste are promoted, the uniformity of oxygen and temperature distribution in the main combustion chamber is improved, and the problems that according to an existing rotary kiln incineration technology, the flue gas emission concentration is unstable and exceedsthe standard frequently are solved.

Description

technical field [0001] The invention relates to the cross technical field of energy and environmental protection, in particular to a method for using an oxygen carrier to assist a rotary kiln to burn and treat hazardous waste gas. Background technique [0002] Hazardous waste is referred to as hazardous waste, which has a variety of hazardous characteristics. Its harmful effects last for a long time and are latent. If it is not handled properly, it will cause serious damage to the environment. Incineration can realize the harmlessness, reduction and recycling of hazardous waste, and occupies an important position in the hazardous waste disposal industry. At present, the incinerators for treating solid waste mainly include grate type, hearth type, fluidized bed type, and rotary kiln type. In comparison, rotary kiln has the characteristics of many types of waste, mature technology, and stable operation. Rotary kilns are widely used in the hazardous waste disposal industry. ...

AI Technical Summary

Problems solved by technology

In an enterprise, there are often problems such as unstable flue gas emission concentration and frequent exceeding of standards within a combustion cycle. The main reasons are insufficient fuel combustion, insufficient oxygen content in the furnace, uneven distribution, and substandard temperature.

At the same time, the generated fly ash and bottom slag contain high levels of harmful components such as heavy metals, have high leaching toxicity, and are usually identified as hazardous waste

However, the traditional process for the treatment of fly ash and bottom slag is only reduced landfill treatment, and the harmlessness is not thorough enough

[0004] These deficiencies have greatly increased the difficulty of flue gas and ash treatment in the process of the rotary kiln treatment hazardous waste system, as well as the investment and operation costs of equipment and equipment. Moreover, if the treatment is not done properly, it will cause serious damage to the living environment of human beings.

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