Process and system for mixed burning of coal slime in big proportion in coal-powder boiler

Abstract

The invention provides a process and a system for mixed burning of coal slime in big proportion in a coal-powder boiler. The process comprises the following steps that coal slime is pre-treated, that is, the coal slime is subjected to impurity removal, crushing and paste manufacturing, so that the coal slime is suitable for pumping; the coal slime is pumped, that is, coal slime paste is hermetically transported in a coal slime powdering unit through a pipeline; the coal slime is powdered, that is, the air inlet temperature of a coal mill is increased and the air volume is increased by adopting a fuel gas heating or high-temperature steam heat exchanging method, and coal slime powder meeting the burning requirement is obtained; and the coal slime powder is fed in the coal-powder boiler in a gradient manner for burning, that is, the coal slime powder is fed in the coal-powder boiler in a gradient and layered manner for burning. The process and the system realize mixed burning of coal slime in big proportion, the operation stability and reliability of the system are improved, the fire coal resources in the boiler are saved, the effects of energy conservation and emission reduction are remarkable, and the pollution of wastes on the environment is eliminated.

Description

technical field [0001] The invention relates to the technical field of solid waste disposal, in particular to a process and system for burning coal slime with a large proportion of pulverized coal furnaces. Background technique [0002] my country is the world's largest coal producer and coal consumer. For a long time, coal has accounted for more than 75% of China's energy mix. 80% of China's coal resource consumption is used for direct combustion, and more than 70% of the smoke and dust emitted by Chinese cities into the atmosphere and SO 2 90% of the total comes directly from coal combustion, and the direct combustion of a large amount of coal has become the main source of air pollution. Making raw coal a clean fuel through coal washing is an important technical measure to improve coal quality, improve coal combustion efficiency, and reduce air pollution. [0003] Coal slime is a by-product of the coal washing process. Coal slime contains a large amount of combustible ...

AI Technical Summary

Problems solved by technology

But at present, due to the immature technology of blending coal slime in pulverized coal furnaces, the proportion of coal slime blending is low, only about 10%, and a large proportion of blending cannot be achieved, and the coal slime needs to be dried and aired separately, and the production efficiency is low.

It affects the popularization and application of pulverized coal furnace mixed coal slime technology

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