System and method for preparing pulverized coal fuel of pulverized-coal boiler by using coal washing tailings

Abstract

The invention provides a system and method for preparing pulverized coal fuel of a pulverized-coal boiler by using coal washing tailings. The system includes a slurry mixing device, an impurity removing and coarse-grain material intercepting device, a grading recovery device, an ore pulp pretreatment device, a coal slime separating device, a coal slime water purifying device, a concentrate dehydration device and a thermal power drying device which are connected in a scientific mode. The method for preparing the pulverized coal fuel of the pulverized-coal boiler through the system comprises the steps of mixing ore pulp, removing impurities in the ore pulp, intercepting coarse-grain materials in the ore pulp, feeding the ore pulp into the grading recovery device for grading, adding floatation agents for pretreatment, feeding the ore pulp into a fine-grain coal slime separating device for separation, dehydrating and drying selected concentrate, feeding the tailings into a coal slime water treatment device for solid-liquid separation, and recycling purified tailing water. By means of the system and method for preparing the pulverized coal fuel of the pulverized-coal boiler by using the coal washing tailings, the pulverized coal fuel meeting the combustion requirements of the pulverized-coal fluidized bed boiler is prepared without the grinding step, emission of the coal washing tailings is reduced, the environment is protected, comprehensive utilization of resources is realized, resources are saved, and the utilization efficiency of coal resources is improved.

Description

technical field [0001] The invention relates to a fuel coal powder preparation technology, in particular to a system and method for preparing fuel coal powder that meets the combustion requirements of pulverized coal boilers by using waste coal washing tailings without grinding steps. Background technique [0002] Pulverized coal boiler is a new type of industrial boiler developed in my country. The coal saving rate is ≥ 40%, the combustion efficiency is ≥ 98%, the boiler thermal efficiency is ≥ 90%, and the pollution emission level is equivalent to that of natural gas boiler. It has the characteristics of high efficiency, energy saving and cleanness. A new type of energy-saving technology that the state encourages and popularizes. [0003] However, the fuel pulverized coal for pulverized coal boilers has relatively strict requirements: particle size ≤ 0.074mm, content greater than 85%, calorific value ≥ 5000 kcal / kg, moisture ≤ 8%. Existing fuel pulverized coal is generally...

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Problems solved by technology

[0004] The purpose of the present invention is to address the disadvantages of using pulverized coal to prepare pulverized coal boiler fuel pulverized coal in the prior art, which leads to a large amount of power consumption and a large amount of dust, which is not conducive to energy saving, emission reduction and environmental protection. One is to provide a coal washing The system for preparing powdered coal boiler fuel pulverized coal from tailings, the second is to provide a method of using waste coal to wash tailings without grinding steps to prepare fuel pulverized coal that meets the combustion requirements of pulverized coal boilers

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