Method using quality-based utilization of low-rank coal to prepare coal-water slurry

Abstract

The invention provides a method using the quality-based utilization of low-rank coal to prepare coal-water slurry. The method includes: drying, performing gasification reduction, crushing and grinding. The method has the advantages that quality-improved coal, rice gas, clean water and coal tar are prepared by the quality-based utilization of the low-rank coal, the prepared quality-improved coal isqualitatively changed as compared with the low-rank coal in terms of coal properties, the low-range coal which is many and large in pore structure, excellent in hydrophilicity, high in water content,different in quality and low in consistency is prepared into the quality-improved coal which is few and small in pore structure, excellent in hydrophobicity, low in water content, identical in quality and high in consistency, and accordingly the coal-water slurry which is high in slurry forming rate (the slurry forming rate of the coal-water slurry can reach 70%) and prepared by different low-rank coal is small in quality difference and high in consistency; the method can provide clean water and use process water provided by other coal processing processes and has excellent system cooperationability.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and relates to a method for preparing coal-water slurry, in particular to a method for preparing coal-water slurry by separating and utilizing low-rank coal. Background technique [0002] More than half of my country's proven coal reserves are low-rank coals, and the volatile matter contained in them is equivalent to 100 billion tons of oil and gas resources. Low-rank coal mainly has the material characteristics of high moisture and high volatility. When burning, the flame is long and smokey, and the degree of coalification is low. Typical coal types are lignite and long-flame coal. my country is rich in coal and lacks oil and gas. How to efficiently utilize low-rank coal has become a major issue in today's clean coal technology. However, whether it is combustion power generation or modern coal chemical utilization, the efficiency of comprehensive utilization is extremely low beca...

AI Technical Summary

Problems solved by technology

However, the properties of coal-water slurry are affected by some variables, especially the properties of coal. The quality of coal-water slurry produced by different raw coals varies greatly. Low-rank coal can be divided into long-flame coal, weakly caking coal, non-caking coal, lignite , and even if the coal types are the same, the quality differences between low-rank coals are large due to the inconsistency in water content, particle size, sulfur content, etc.

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