High-sodium coal pretreatment system

Abstract

The invention relates to the field of coal-fired thermal power generation and discloses a high-sodium coal pretreatment system. The system comprises a pulverized coal preparing subsystem, a boiler and a steam turbine, wherein the pulverized coal preparing subsystem is used for preparing pulverized coal from high-sodium coal, and the boiler and the steam turbine are connected in sequence and are connected with the pulverized coal preparing subsystem respectively to supply heat energy; the pulverized coal preparing subsystem comprises a coal washing unit, a drying unit and a pulverized coal preparing unit which are connected sequentially; the coal washing unit is used for performing hot washing sodium removal treatment on the high-sodium coal, and wet sodium-removed coal is obtained; the drying unit is used for drying the wet sodium-removed coal, and dry sodium-removed coal is obtained; the pulverized coal preparing unit is used for crushing the dry sodium-removed coal for preparation of the pulverized coal. According to the high-sodium coal pretreatment system, the pulverized coal is prepared through concentrated pretreatment integrating coal washing, drying and pulverized coal preparation for the high-sodium coal, so that the problems of contamination, slagging and the like caused by high sodium content in a follow-up use process of the high-sodium coal are solved, the water transportation cost caused by direct transportation of the high-sodium coal is also avoided by means of the dry pulverized coal, and the follow-up transportation is more economical and more convenient.

Description

technical field [0001] The invention relates to the field of coal-fired thermal power generation, in particular to a high-sodium coal pretreatment system. Background technique [0002] High-sodium coal refers to coal with a sodium content (calculated as ash) greater than 2%. For example, Zhundong coal in Xinjiang, my country is a high-sodium coal. Xinjiang Zhundong coalfield is currently the largest integrated coalfield in my country and the world , Its development and utilization are of great significance to our country. [0003] At present, in the Zhundong coalfield, the utilization of Zhundong coal, which is a high-sodium coal, is mainly to mine the raw coal and transport it directly to the place of use, such as a coal-fired power plant, where it is mixed with contaminated coal for use. However, in coal-fired power plants, problems such as severe slagging of burners in the furnace and fouling and clogging of high-temperature superheaters and high-temperature reheaters wil...

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Problems solved by technology

[0006] In addition, regarding the existing methods of utilizing high-sodium coal in the Zhundong coalfield in Xinjiang, raw coal is directly transported to the place of use or processing, and the "moisture" contained in the raw coal is relatively high, causing problems during transportation. "Water transportation" accounts for a large part of the transportation cost, which greatly increases the cost. Moreover, due to the huge storage capacity of the Zhundong coalfield, the fuel consumption in some areas is limited after all. Therefore, the coal produced must be transported nationwide. The traditional use mode is in While increasing costs, it limits the wide-scale transportation and use of Zhundong Coalfield

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