Safe and efficient system and safe and efficient method for preparing powdered coal

Abstract

The invention provides a safe and efficient system and a safe and efficient method for preparing powdered coal. The system comprises a coal preparation system, a coal grinding system, a separating system and a superheated steam generating system, wherein the coal grinding system is provided with a material inlet, a superheated steam inlet, a powered coal outlet and a hot dust steam outlet; an outlet of the coal preparation system is communicated with the material inlet of the coal grinding system; an outlet of the superheated steam generating system is communicated with the superheated steam inlet of the coal grinding system; a hot dust steam outlet of the coal grinding system is communicated with an inlet of the separating system; the separating system is provided with a powered coal outlet and a hot steam outlet; the hot steam outlet of the separating system is communicated with a circulating steam inlet of the superheated steam generating system. Superheated steam is taken as protective gas, and thus the safety problem during the preparation of powered coal is solved; the protective medium of superheated steam can be basically subjected to full cyclic utilization, and thus the problems of pollutant discharge and heat waste are solved; the powered coal is dried by the superheated steam in a coal grinding machine, and thus the drying process is eliminated, the technical process is simplified, and the material processing cost is reduced.

Description

technical field [0001] The invention belongs to the field of coal processing, and relates to a pulverized coal preparation technology using raw coal, semi-coke or petroleum coke as raw materials, in particular to a safe and efficient pulverized coal preparation system and method. Background technique [0002] my country is the world's largest coal producer and also a major coal consumer. China's proven recoverable reserves of coal rank among the top in the world, and the annual coal mining volume of the entire industry reaches nearly 1 billion tons. my country's coal-based pattern determines that clean and efficient coal processing and utilization methods must be adopted to solve energy problems. [0003] Coal powder preparation is a coal processing method often used in electric power, chemical industry, metallurgy and other industries. Coal powder preparation is generally divided into wet preparation process and dry preparation process. Among them, the wet method is safe ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the defects of the prior art and provide a safe and efficient pulverized coal preparation system and method, which solves the problems of serious heat loss and serious environmental pollution caused by gas emissions in the process of preparing pulverized coal by the existing dry method

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