Cement kiln waste heat comprehensive utilization power generation system and method

Abstract

The invention provides a cement kiln waste heat comprehensive utilization power generation system which comprises a rotary cement kiln, a grate cooler, an AQC (air quenching cooler) waste heat boiler, an SP waste heat boiler, a steam turbine and a power generator, wherein the AQC waste heat boiler comprises a first heat exchanger, a second heat exchanger and a first boiler barrel, the first heat exchanger is internally provided with a first economizer, the second heat exchanger is internally provided with a second economizer and a first evaporator; the SP waste heat boiler comprises a third heat exchanger and a second boiler barrel, the third heat exchanger is internally provided with a second evaporator; water in the first economizer is heated and then flows into the second economizer and continuously flows to a water supply collection tank and respectively flows into the first boiler barrel and the second boiler barrel; and water in the first boiler barrel is heated circularly in the first evaporator, water in the second boiler barrel is circularly heated in the second evaporator, and heat steam is collected to a steam collection tank, and enters into a fourth evaporator for being continuously heated, and finally enters into the steam turbine to drive the power generator to generate electricity. According to the invention, the recycling efficiency of waste heat of the cement kiln is increased and electric energy production is increased.

Description

technical field [0001] The invention belongs to the technical field of cement kiln waste heat power generation, and relates to a cement kiln waste heat comprehensive utilization power generation system and a power generation method. Background technique [0002] With the development of new dry process cement clinker production technology, my country's cement industry has made great progress in energy-saving technology. The high-temperature waste heat of cement kilns has been recycled in cement production, and the heat consumption of cement clinker has changed from 4600 in the past. -6700kJ / kg dropped to 3000-3600kJ / kg. However, due to the limitation of cement clinker production technology and domestic energy-saving technology level, there is still a large amount of low-temperature waste heat below 400 °C in the cement production process that cannot be fully utilized, and its heat accounts for about 10% of the total heat consumption of the cement clinker firing system. More t...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a cement kiln waste heat comprehensive utilization power generation system to overcome the problem of resource waste caused by insufficient utilization of medium and low temperature waste heat generated in the cement production process in the prior art

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