Thermodynamic method and system for cement kiln to realize cooperative treatment of domestic garbage

Abstract

The invention relates to a thermodynamic method and a thermodynamic system for a cement kiln to realize cooperative treatment of domestic garbage and belongs to the technical field of garbage treatment. The thermodynamic method for the cement kiln to realize cooperative treatment of domestic garbage comprises the following steps of: (1) conveying the domestic garbage to an RDF manufacturing plant;(2) conveying RDF to a fluidized bed incinerator, wherein high-temperature flue gas generated in incineration enters a cyclone separator, passes through an over-heater, a coal economizer, a denitrating device and an air preheater after recycling a part of a fuel and then enters a decomposition furnace and a cement burning rotary kiln; and high-temperature steam generated by the over-heater entersa steam replenishing type steam turbine and is used for driving a generator to generate electricity; and (3) conveying furnace slags generated by garbage incineration to a cement kiln raw material storehouse and obtaining cement clinkers after cement burning and rotary kiln burning. The invention further provides the thermodynamic system for the cement kiln to realize cooperative treatment of thedomestic garbage; a cement production system and a garbage incineration system share one set of flue gas treatment equipment, so the investment is lowered, the cost is lowered, and the economical efficiency of the whole plant is improved.

Description

technical field [0001] The invention relates to a thermal method and a system for coordinating domestic garbage in a cement kiln, and belongs to the technical field of garbage treatment. Background technique [0002] The principle of using cement kilns to co-process municipal solid waste is similar to that of incineration power generation, which uses high temperature to process waste. Since the cement kiln temperature is higher than that of the waste incineration plant, on the one hand, the cement burning system can be used to digest the odor and toxic substances in the waste treatment process; Toxic substances can be decomposed into corresponding inorganic substances and heavy metals and solidified in cement clinker. The co-processing of solid waste in cement kilns is of great significance to both solid waste treatment and the development of the cement industry. [0003] The existing cement kiln synergistic treatment methods have the following problems: 1. Excessive utili...

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Problems solved by technology

[0003] The existing cement kiln synergistic treatment methods have the following problems: 1. Excessive utilization of waste heat in the cement production process, resulting in loss and waste of heat energy; 2. Initial air temperature of the primary and secondary air of the incineration boiler is low, resulting in energy waste Moreover, the primary and secondary air humidity is high, which seriously corrodes the air preheater and superheater; 3. The slag reduction rate of the grate furnace is difficult to reach the standard 5%, which affects the quality of cement as a cement raw material; 4. The grate furnace smoke The gas directly enters the cement kiln decomposition furnace, causing excessive NOx emissions in the subsequent flue gas treatment; 5. The layout of the cement plant is scattered and far away from the urban area, and the domestic waste is co-processed, and the transportation cost is high

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