Process and device for co-processing municipal sludge through iron ore sintering work procedure

Abstract

The invention relates to the technical field of utilization of waste as resources, in particular to a process and device for co-processing municipal sludge through an iron ore sintering work procedure. The process comprises the step of distributing a sintering mixture, wherein the sintering mixture consists of a mixture A and a mixture B; the mixture A is prepared by mixing and granulating municipal sludge and parts of sintered materials; the mixture B is prepared by mixing and granulating residual sintering materials; and the material distribution mode is as follows: the mixture B, the mixture A and the mixture B are sequentially distributed. According to the process disclosed by the invention, pollutants such as volatile organic compounds (VOCs) decomposed from the municipal sludge in a sintering and heating process in the part of flue gas can be intensively collected; meanwhile, the pollutants are input into a sintering machine again by utilizing a circulating flue to be fully combusted, so that the concentration of the organic pollutants such as the VOCs in the sintering flue gas during co-treatment of the municipal sludge is reduced; and heat released by combustion of organic matters is fully utilized.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of waste, and in particular relates to a process and a device for co-processing urban sludge in an iron ore sintering process. Background technique [0002] Municipal sludge mainly refers to semi-solid or solid substances produced in the process of urban sewage treatment, which gather almost all pollutants in sewage. With the continuous improvement of the level of urbanization in our country, the amount of sewage to be treated by urban sewage plants has shown a skyrocketing trend, and the sludge production has also increased significantly at the same time. Therefore, it is necessary to take timely and efficient disposal measures for it. [0003] However, the disposal of municipal sludge is a worldwide problem. Its moisture content is high (70%-85%), its organic content is high, and it is perishable; it contains parasite eggs, pathogenic microorganisms and other pathogenic substances, ...

AI Technical Summary

Problems solved by technology

[0006] At present, the process of co-processing municipal sludge with sintering process mainly includes mixing municipal sludge with sintering materials, granulation, and sintering. However, no effective attention has been paid to the impact of the thermal decomposition products of sludge in the mixture on the concentration of specific pollutants in the sintering flue gas and the subsequent flue gas purification treatment

[0007] However, according to the thermal reaction characteristics of municipal sludge, it can be known that municipal sludge begins to decompose into polycyclic aromatic hydrocarbons, C x h y Volatile organic compounds (VOCs) and other volatile organic compounds (VOCs) will also produce dioxins during combustion; however, existing flue gas purification devices cannot completely remove these pollutants. After introducing municipal sludge, sintering discharges VOCs and dioxins The concentration of other pollutants will increase and pollute the environment

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