A method for preparing ultra-pure coal assisted by electrohydraulic pulverization

Abstract

The invention discloses a method for preparing hyperpure coal with assistance of liquid-electric crushing. The method comprises the following steps: (1) putting a coal raw material into water, carrying out pulse discharge by using a high-voltage pulse generator, crushing coal by using intense laser waves generated from a discharge channel, and filtering and retaining solid granules of which the particle size is greater than an expected particle size critical value so as to obtain a solid-liquid mixture of coal and water, wherein the average electric field strength of pulse discharge is 15-25kV / cm; (2) carrying out alkali treatment; (3) carrying out acid treatment; (4) adjusting a pH value, and carrying out drying treatment. By improving overall process design of the preparation method, a liquid-electric crushing treatment process is adopted to crush the coal raw material, hyperpure coal with a very low ash content can be obtained, and the problems that a conventional hyperpure coal preparation method is poor in crushing effect, large in potential safety hazard, serious in dust pollution and the like can be effectively solved.

Description

technical field [0001] The invention belongs to the field of ultra-pure coal preparation, in particular to the intersecting field of high-voltage technology, pulse power technology and mining engineering, and more specifically relates to a method for assisting the preparation of ultra-pure coal by hydroelectric pulverization. Background technique [0002] China is a country rich in coal and low in oil, and coal resources have always been regarded as the most basic part of my country's energy strategy. The conventional use of coal is mainly as a primary energy source. The direct use of coal as a fuel has low added value and produces a lot of harmful gases and dust. In some areas, more than 30% of the air pollutants come from the direct combustion of coal. In view of the pressure brought by environmental protection, the development of clean coal technology and the diversified utilization of coal resources are the general trend. At present, the industry has made a lot of progre...

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Problems solved by technology

[0007] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for assisting the preparation of ultra-pure coal by electrohydraulic pulverization, wherein by improving the overall flow process design of the preparation method, the electrohydraulic pulverization treatment process is used to Coal raw materials are crushed to obtain ultra-pure coal with extremely low ash content, which can effectively solve the problems of poor crushing effect, large safety hazards, and serious dust pollution in the existing ultra-pure coal preparation methods

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