Cement kiln CO2 emission reduction system and method

Abstract

The invention relates to a cement kiln CO2 emission reduction system and method. The cement kiln CO2 emission reduction system comprises a cement kiln preheater, an electric heating pyrolysis rotary kiln, a high-temperature waste heat boiler, a steam turbine, a generator, a dust collector, an exhaust fan, an adsorption bed, a rectifying tower, an induced draft fan and a storage tank, wherein a gasoutlet of the high-temperature waste heat boiler is connected with a gas inlet of the dust collector; a steam outlet of the high-temperature waste heat boiler is connected with a steam inlet of the steam turbine; the output end of the steam turbine is connected with the input end of the generator; and the electric energy output end of the generator is connected with the electric energy input endof the electric heating pyrolysis rotary kiln. According to the cement kiln CO2 emission reduction system and method, firstly, heat in smoke is extracted, electric energy is generated through the steam turbine and the generator to be used for providing electric energy for operation of the electric heating pyrolysis rotary kiln, and therefore energy consumption is reduced; then, CO2 is subjected todust removal, purification and rectification and then is collected in a centralized manner to be reutilized, and cement kiln CO2 emission reduction is achieved; and in addition, other agents do not need to be added, and cost is low.

Description

technical field [0001] The invention relates to a cement kiln CO 2 Mitigation systems and methods. Background technique [0002] my country's calcium carbonate industry is relatively developed, and its annual output is second only to the United States, accounting for the second in the world. It is widely used in the manufacturing process of paper, rubber, paint and other products. Therefore, the amount of calcium carbonate solid waste is also relatively large. Disposal and resource utilization of calcium carbonate solid waste is the focus. Waste calcium carbonate can be used as raw material for cement clinker production, which is a direction for waste calcium carbonate disposal. [0003] When waste calcium carbonate is pyrolyzed into cement, it will produce a large amount of CO 2 flue gas, CO 2 It is an important factor of global warming and must be reduced before it can be emitted; the existing CO 2 Emission reduction methods mainly include membrane separation method, ad...

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Problems solved by technology

[0003] When waste calcium carbonate is pyrolyzed into cement, it will produce a large amount of CO 2 flue gas, CO 2 It is an important factor of global warming and must be reduced before it can be emitted; the existing CO 2 Emission reduction methods mainly include membrane separation method, adsorption separation method, low-temperature distillation method and physical absorption method; however, membrane separation method and low-temperature distillation method require high pressure and high energy consumption; The amount of agent used is large and the cost is high; the absorption liquid in the physical absorption method is easily polluted by impurities and the absorption efficiency is reduced; 2 flue gas, CO 2 Separation and purification are difficult and need to be further improved

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