Soft coal rock sample preparation system and method

Abstract

The invention relates to a soft coal rock sample preparation system and method .The system comprises a box with a box cover and a safety relief valve .Holes are formed in the box cover, the box cover is connected with a liquid nitrogen treatment system and a vacuumizing system through pipelines, and the liquid nitrogen treatment system comprises a liquid inlet valve, a first pressure gauge, a liquid nitrogen tank stop valve and a liquid nitrogen tank which are sequentially connected through a liquid inlet pipeline .The safety relief valve penetrates through the box cover and stretches into the box .The joint of the safety relief valve and the box cover is sleeved with a sealing sleeve .According to the system, the vacuumizing system is adopted for vacuum degassing, soft coal rock fractures and other microdefect spaces are filled with water, and a water absorption saturation state is achieved .The liquid nitrogen treatment system is utilized for carrying out ultralow temperature treatment on soft coal rock, the soft coal rock is frozen, and the difficulty that the soft coal rock is prone to be broken when used for preparing a test sample is solved .The system is simple in structure and convenient to use, the soft coal rock test sample is prepared fast and efficiently, and advantageous test determination conditions are provided for physical and mechanical property parameters of the soft coal rock.

Description

technical field [0001] The invention belongs to the technical field of coal and rock characteristic tests, in particular to a soft coal and rock sample preparation system and method, which are mainly used for making coal and rock test samples used in indoor experiments. Background technique [0002] As we all know, in the design of coal mining, coal seam gas drainage, coal bed methane gas injection mining and other projects, the physical and mechanical characteristic parameters of coal rock (such as: tensile and compressive strength of coal rock, adsorption constant, permeability, etc.) are very important These parameters must be obtained through experiments. However, most of the mine coal seams in my country are soft coal seams, and the characteristics of soft coal, low strength and easy breakage make the preparation of soft coal samples more difficult. Therefore, the preparation method of soft coal coal samples is an urgent problem to be solved by scientific researchers. ...

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Problems solved by technology

The other is the raw coal production method, using a drilling sampling machine to directly sample on a large intact coal block, because there are some initial cracks / cracks in the raw coal block and its strength is low, easy to break, the coal sample starts before the drilling is completed Breakage occurs, the success rate is low, and it is difficult to achieve the ideal sampling effect

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