Cement rotary kiln co-processing domestic waste and energy comprehensive utilization system and method

Abstract

The invention relates to a system and a method of synergistic treatment of household garbage and energy resource comprehensive utilization with a rotary cement kiln. The system includes a garbage metering and storing system, a grate furnace, a rotary kiln, a decomposition furnace, a pre-heater, a boiler water steam comprehensive utilization system, a grate cooler, a kiln head dust collector, an odor treatment system and a leachate treatment system. Household garbage is fermented to reduce the moisture to about 20% and then is fed into the grate furnace by a grab bucket for being combusted, and generated flue gas is fed into the decomposition furnace through a kiln tail smoke chamber. In the decomposition furnace, harmful substances in the gas are decomposed under a high-temperature environment, wherein the waste ash in the flue gas is fed into the rotary kiln with the materials in the decomposition furnace together and then is calcined to form clinker. Meanwhile, flue gas in the kiln is subjected to equivalent replacement in the kiln tail smoke chamber, wherein the flue gas, after passing through a boiler, is discharged into the kiln head dust collector to collecting dust and then is emitted into air through a chimney. The system is free of a garbage sorting facility. The method is simplified in processes and is reduced in cost, is reduced in operation cost of garbage treatment, so that the method and the system can improve the problem that there is no garbage sorting in China at present.

Description

technical field [0001] The present invention relates to a cement rotary kiln cooperative treatment system and method for domestic waste and comprehensive utilization of energy, in particular to a system for utilizing grate furnace and dry-process cement rotary kiln for cooperative treatment of domestic waste and utilizing a back pressure steam turbine for efficient energy conversion The method belongs to the technical field of domestic waste treatment. Background technique [0002] With the improvement of people's living standards, the discharge of domestic waste is also increasing. At present, my country's municipal solid waste stockpile has reached 6 billion tons, occupying 500 million square meters of arable land, producing 200 million tons of municipal solid waste every year, and will grow rapidly at a rate of 9%. These large quantities of domestic waste have constituted an increasingly serious threat to the ecological environment in and around the city. [0003] Tradi...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of poor stability, low calorific value, and high moisture in urban waste, the incineration of waste produces a large amount of flue gas and low oxygen content, the introduction of the cement kiln decomposition furnace affects the normal air use of the rotary kiln system and affects the decomposition. The combustion of fuel in the furnace will greatly reduce the output, quality and stability of the cement kiln

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