Coal sample powder preparation equipment and powder preparation method thereof

Abstract

The invention provides coal sample powder preparation equipment. A vertical powder preparation machine communicates with a coal sample feeding pipe and a coal sample discharging pipe; a feeding machine for pumping and conveying a coal sample in the vertical powder preparation machine is arranged on the coal sample discharging pipe; the discharging end of the feeding machine is provided with a material discharging pipeline; the material discharging pipeline comprises a sampling pipeline used for discharging the coal sample in the feeding machine and a circulation pipe communicating with the coal sample feeding pipe of the vertical powder preparation machine. The coal sample is subjected to vertical cutting crushing and is then pumped out by the feeding machine; a vertical cutting crushing structure has high adaptability on coal sample moisture; the crushing is performed in a coal sample conveying air flow; the coal sample residue is small; the arrangement of a sieve screen is not neededin the vertical powder preparation machine; the blockage problem is avoided; the material discharging pipeline comprises the sampling pipeline and a circulation pipeline; when the crushed coal samplemeets the requirements, the materials can be taken out from the sampling pipeline; when the requirement is not met, the materials can be conveyed to the vertical powder preparation machine through the circulation pipe for further crushing; the coal sample powder preparation reliability is improved. The invention also provides a powder preparation method of the coal sample powder preparation equipment.

Description

technical field [0001] The invention relates to the technical field of coal quality evaluation, and more specifically relates to a coal sample pulverizing equipment and a pulverizing method thereof. Background technique [0002] Coal, as a commodity, is unique in that it is a heterogeneous bulk, and its properties vary greatly depending on the place of origin, and its quality also varies greatly due to differences in mining methods, storage and transportation methods, and management levels. difference. In addition, various industrial uses have different quality requirements for coal types, so the evaluation of coal quality also has particularity that general commodities do not have. [0003] The correct coal quality evaluation must have a coal sample that can represent the entire sample, and the acquisition of a representative coal sample must have a standardized sampling and sample preparation system, so sampling and sample preparation are the correct way to carry out coal...

AI Technical Summary

Problems solved by technology

This equipment has the following disadvantages. First, the particle size is difficult to reach 100%. The grinding bowl has poor adaptability to materials. It has good adaptability to brittle substances and poor adaptability to flexible substances.

Therefore, grinding-type pulverization has higher requirements on the drying of coal samples. When the coal samples are dry, the pulverization effect is good, but according to the standard requirements, 100% of the particle size requirement of 0.2 is required, so the drying of the coal samples is not sufficient. Under such circumstances, it is difficult to meet the requirements of 100% milling granularity

Second, the grinding bowl has high vibration and noise, and the reliability is not high.

This kind of equipment has a screen that is easy to block and easy to residue

The screen is easily broken and the reliability is not high

Moreover, heat accumulation will be generated during the screen cutting process, resulting in high temperature inside the equipment and affecting coal quality.

At the same time, the sieve cutting milling method has low efficiency and long milling time

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