Thermal power plant flue gas recirculation and sludge drying coupled on-line mixed-burning system

Abstract

The invention provides a thermal power plant flue gas recirculation and sludge drying coupled on-line mixed-burning system, and belongs to the field of boiler flue gas waste heat utilization and sludge drying in order to solve the problems that in a current system, odorous gas leaks, flue gas carries toxic and harmful organic matter, consequently, environmental pollution is caused, and up-to-standard discharge of dust and sulfur is affected, system operation is not flexible enough, boiler NOx emission exceeds the standard during the low load. After a quick lime weighing conveyor in a sludge drying system mixes wet sludge with quick lime, a mixture is conveyed into one or two drying machines through a first screw conveyor and a sludge strip cutting machine, 120-150 DEG C high-temperature flue gas from a circulating fluidized bed power generation system enters the drying machines to be dried, dried sludge is conveyed into a blending bin through a dried sludge weighing conveyor to be mixed with pulverized coal and then enters a boiler for burning, flue gas from the drying machines serves as boiler primary air for recirculation to be delivered back to a hearth, the circulating fluidized bed power generation system is combined with the sludge drying system, and after the wet sludge is dried through flue gas waste heat, the dried sludge is taken as fuel for burning power generation.

Description

technical field [0001] The invention relates to the technical field of waste heat utilization of boiler flue gas in a thermal power plant and sludge drying utilization, and in particular relates to an on-line co-combustion system for thermal power plant flue gas recirculation coupled with sludge drying. Background technique [0002] In recent years, environmental protection requirements have become more and more stringent, especially for sewage treatment. With the increasing scale of sewage treatment plants, sludge production is also increasing. Sludge has the characteristics of high water content and huge volume, which is extremely inconvenient in the process of storage, transportation, loading and unloading, etc., and there are also high potential environmental safety risks and hidden dangers. Reduction and recycling are imperative. At present, sludge treatment methods mainly include landfill, composting, natural drying or incineration. Practice has shown that sludge dry...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the leakage of malodorous gas in the current sludge drying mixed combustion system, the toxic and harmful organic substances in the flue gas cause environmental pollution and affect the discharge of dust and sulfur, the system operation is not flexible enough, and the boiler NO at low load x To solve the technical problem of excessive emissions, the present invention provides a thermal power plant flue gas recirculation coupling sludge drying online blending system

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