Method and equipment for sodium removal of high sodium coal

Abstract

The invention provides a method and equipment for sodium removal of high sodium coal. The method includes: sending broken raw coal to first stage washing, washing the raw coal with an aqueous solution from a second stage coal washing device, then sending the raw coal into the second stage coal washing device, conducting washing with an aqueous solution from a third stage coal washing device, further sending the washed coal sample into a third stage coal washing device, performing washing with the pure water treated by a reverse osmosis purification device or an aqueous solution that comes from the first stage coal washing device and passes through a vibrating-dewatering screen and a centrifugal dehydrator, letting the removed water enter a wastewater treatment system, making a saturated water solution enter a concentration pool, adding a chemical precipitating agent to remove suspended particles from the aqueous solution, and sending the sodium-free aqueous solution into the third stage coal washing device for cyclic washing of high sodium coal. At the same time, the invention provides the equipment corresponding to the method. According to the existence way of sodium in Xinjiang high sodium coal, the raw coal is washed through aqueous solutions to realize dust washing and sodium removal. After dehydration by the vibrating-dewatering screen and centrifugation, the dehydrated low sodium coal can be directly used for coal-fired power generator sets or gasification furnaces.

Description

technical field [0001] The invention belongs to the technical field of clean and efficient utilization of high-sodium coal, and relates to high-sodium coal-fired power generation technology, in particular to a furnace pretreatment system for high-sodium coal-fired power plant boilers. Background technique [0002] In recent years, coal mining and electric power have developed rapidly in Xinjiang, my country. After exploration, the Zhundong Coalfield, one of the four major coalfields in Xinjiang, contains about 390 billion tons of high-sodium low-rank coal resources. At present, the cumulative proven coal resource reserves are 213.6 billion tons, and the coal-forming area of ​​the coalfield is 14,000 square kilometers. It is currently the largest integrated coal field in my country. According to the current annual coal consumption of thermal power in my country, one Zhundong coalfield is enough for the whole country to use for one hundred years. Due to the history of coal fo...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a multi-stage recyclable water washing system for desodium purification of Xinjiang high-sodium coal, which uses the least amount of water to turn Xinjiang high-sodium coal into low-sodium coal, and fundamentally solves the problem of fuel consumption. Problems such as coking in the furnace, contamination and corrosion of the heating surface faced by high-sodium coal generating units

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