High-sodium coal sodium removal, quality improvement fan mill pulverization and water recovery combined cycle power generation system

Abstract

The invention relates to a high-sodium coal sodium removal, quality improvement fan mill pulverization and water recovery combined cycle power generation system, which at least comprises a drying pipe, a coal mill, a pulverized coal separator, a pulverized collector, a pulverized coal bunker, an air and pulverized coal mixer and a boiler which are sequentially and serially connected. The system additionally comprises a mixing chamber, a steam turbine, and a steam exhaust waste heat recovery device, a steam exhaust condensation and recovery device, a raw coal sodium removal device, a separation device and a water treatment unit which are sequentially connected. The system has the advantages that the content of alkali metals in raw coal is reduced, the problems of furnace coking, heating surface contamination and corrosion and the like caused to a high-sodium-coal-fired power generator set are greatly improved or fundamentally solved, the system is effective and applicable to quality improvement treatment of East Junggar coal and other high-sodium, high-water-content and poor-quality coal, the process is simple, the operation safety is high, the investment is small, the energy is saved, the environment is protected, the goal of circular economy is realized, and the system not only can be used for supplying high-quality clean coal, but also can be used for high-sodium-coal-fired pithead power generator sets to realize coal and electricity co-production.

Description

technical field [0001] The invention belongs to the technical field of coal power generation, and relates to high-sodium coal power generation technology, in particular, to a high-sodium coal desodium upgrading fan milling and water recovery combined cycle power generation system. Background technique [0002] High-sodium coal refers to a special type of coal with a high content of alkali metal compounds in coal. Among all kinds of alkali metal compounds, sodium-based compounds are generally in the majority, so it is called "high-sodium coal". At present, my country's high-sodium coal is mainly concentrated in the Zhundong Coalfield in the eastern part of the Junggar Basin in Xinjiang. The predicted reserves of Zhundong Coalfield resources are 390 billion tons. It is currently the largest integrated coal field in my country. Based on the current annual coal production in my country, one Zhundong coalfield can be used nationwide for a hundred years. Due to abundant resource...

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Problems solved by technology

[0011] However, the above structure does not fully consider the desodium treatment of high-sodium coal, and how to use the heat and moisture contained in the exhaust gas. The heat energy recovery and water recovery of the exhaust gas are insufficient, resulting in a large amount of heat energy and water resources being wasted.

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