System and method for preparing ultrafine pulverized coal

Abstract

The invention discloses a system and a method for preparing ultrafine pulverized coal. The system comprises a fine pulverized coal preparation system and an ultrafine pulverized coal separation system. The fine pulverized coal preparation system comprises a vertical-type grinding machine. The vertical-type grinding machine is communicated with a bucket elevator. The bucket elevator is communicated with the ultrafine pulverized coal separation system. The ultrafine pulverized coal separation system comprises a pulverized coal surge bin. The pulverized coal surge bin is communicated with a grading machine. The grading machine is communicated with a cyclone separator. The cyclone separator is communicated with a pulse bag-type dust collector. The grading machine is communicated with a fine pulverized coal finished-product bin. The cyclone separator is communicated with an ultrafine pulverized coal finished-product bin 1#. The pulse bag-type dust collector is communicated with an ultrafine pulverized coal finished-product bin 2#. The method comprises fine pulverized coal preparation and ultrafine pulverized coal separation extraction. Through three-grade separation extraction adopting the grading machine, the cyclone separator and the pulse bag-type dust collector, the ultrafine pulverized coal is divided into different grades of ultrafine pulverized coal. The ultrafine pulverized coal obtained by the system and the method has a low cost and does not burn easily. The graded ultrafine pulverized coal can satisfy requirements on particle size graduation of coal water slurry master batch. The system and the method can realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of ultrafine coal powder, and relates to a preparation system and method of ultrafine coal powder. Background technique [0002] Coal is the main energy source in our country, and it will not change for a long time in the future. The state implements the clean coal plan, and regards clean coal technology as an important means to improve coal utilization efficiency and reduce environmental pollution, which is attracting more and more attention from all walks of life. In addition, coal is the non-renewable strategic resource with the largest reserves and the widest distribution in China. The comprehensive utilization of coal resources is an important direction for current and future development. It has great strategic significance for deep processing of coal, extending the industrial chain, and increasing the added value of coal. [0003] Grinding coal into coal powder for boiler combustion improves the combu...

AI Technical Summary

Problems solved by technology

[0005] (1) High preparation cost

For example, the production of fine powder produced by conventional ultrafine powder preparation equipment jet mill is low, energy consumption is large, and air consumption is large.

[0006] (2) Ultra-fine pulverized coal has a large specific surface area, which is more prone to oxidation and spontaneous combustion. The conventional mill system does not take this characteristic of pulverized coal into account

[0007] (3) The particle size distribution of the conventional coal grinding system is single, which not only affects the particle size distribution of the CWS masterbatch, but also limits the product types

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