Method for removing sodium in Sinkiang high-sodium coal

Abstract

The invention relates to a method for removing sodium in Sinkiang high-sodium coal. The method for removing the sodium in the Sinkiang high-sodium coal comprises the following steps: crushing high-sodium raw coal into crushed raw coal in a certain size; washing the crushed raw coal by adopting a high temperature washing solution at a first temperature and a certain pressure to obtain mixed liquor, and stabilizing for a certain time; stirring the mixed liquor for a period of time to obtain a high temperature stirred liquid; cooling the high temperature stirred liquid to a second temperature to obtain a low temperature stirred liquid; carrying out coal water separation on the low temperature stirred liquid to obtain waste liquor and upgraded coal; drying the upgraded coal to obtain low-sodium low-oxygen coal. By virtue of the sodium removing and oxygen removing processes, alkali metal content and oxygen content in the high-sodium raw coal are finally reduced, quality and utilization rate of high-sodium coal are improved, and content of sodium alkali metal volatilized in a combustion process of the high-sodium coal is greatly reduced, so that contamination, scorification and dust stratification caused by combustion of the high-sodium coal are well controlled, heat release during combustion of coal is not influenced, and the treated high-sodium raw coal can be utilized more widely.

Description

technical field [0001] The invention specifically relates to a method for removing sodium from high-sodium raw coal in Xinjiang to obtain low-sodium and low-oxygen coal. Background technique [0002] my country is a country rich in coal resources. Coal is the main energy source in our country, accounting for more than 70% of the energy consumption structure. And with the decreasing reserves of petroleum resources and the development of new energy sources needs to be improved, the advantages of coal resources are becoming more and more obvious. [0003] High-sodium coal refers to coal with high sodium content in coal, which has certain reserves in Australia, the United States, Germany and other places. Zhundong, Xinjiang is an area rich in coal resource reserves, with predicted reserves of 390 billion tons. At present, the cumulative proven coal resource reserves are 213.6 billion tons, and the coal-forming area of ​​the coal field is 14,000 square kilometers. It is currentl...

AI Technical Summary

Problems solved by technology

However, there are still deficiencies in how to reduce the alkali metal content of high-sodium coal into the furnace, prevent slagging, contamination and corrosion, improve the combustion quality of Zhundong coal, and ensure the safe and economical long-term operation of the boiler and the treatment technology.