Process and system for treating sludge by utilizing waste heat of boiler

Abstract

The invention relates to a process and system for treating coal slime or sludge by using waste heat of a power station boiler. The process comprises the steps of feeding, wherein coal slime or sludge is purified, crushed and then conveyed into a drying machine to have the characteristic of being suitable for drying; drying, wherein hot flue gas of the boiler is introduced into the drying machine to serve as a heat source and makes direct contact with the coal slime or sludge for heat exchange so that the coal slime or sludge can be dewatered and dried; blending combustion, wherein the dried coal slime or sludge is conveyed into the boiler for blending combustion to realize final treatment of the coal slime or sludge; and drying waste gas treatment, wherein evaporated moisture in the drying machine is introduced into the boiler for combustion to prevent odor generated by sludge drying from leaking. According to the process, the coal slime or sludge is treated by utilizing the waste heat of the boiler in an environment-friendly manner, no odor leaks, the operation stability and reliability of a blending combustion system of the boiler are improved, the bunker coal resources of the boiler are saved, the energy conservation and emission reduction effects are obvious, and the pollution of the waste to the environment is eliminated.

Description

Technical field [0001] The present invention relates to the field of solid waste disposal, in particular, a process and system for placing sludge by boiler waste heat. Background technique [0002] According to statistics, my country has built 3,800 city sewage treatment plants, which produces 43 million tons per year. Municipal sludge is the product after the sewage treatment of urban and industrial sewage treatment plants. About 70% of pollutants in sewage transferred to sludge, and their ingredients are complex, including a large amount of organic matter, but also harmful heavy metals, pathogenic microorganisms, dehydration Sex, easy to corusure, high treatment and treatment, and the risk is large. If the sludge is not properly treated, disposal will bring severe pollution to the surrounding air, water source and soil environment. [0003] At present, domestic utilization of power plant boiler is blending is a sludge disposal method for applications. The Ministry of Environmen...

AI Technical Summary

Problems solved by technology

For example, ①The dry sludge is discharged from the chimney through the cyclone separator, and the dust emission cannot meet the standard; ②The dry sludge contains obvious odor and is discharged without treatment, which seriously affects the air quality of the power plant and its surroundings; ③The original dry sludge Excessive water content can easily cause blockage of the coal delivery system of the power plant

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