Experiment apparatus having certain pressure adsorption state by quantitative addition of moisture in coal body

Abstract

The invention discloses an experiment apparatus having a certain pressure adsorption state by quantitative addition of moisture in coal body. The experiment apparatus comprises two high pressure steel cylinders, the high pressure steel cylinders are connected with gas filling pipelines through a balance tank, the quantity of gas filling pipeline is three, and the gas filling pipelines are respectively connected with a first coal sample pot, a reference pot and a second coal sample pot, the first coal sample pot and the second coal sample pot respectively pass through a high pressure water-injection pipeline and is connected with a high pressure ball valve, a non return valve, a non return valve, a metering pump and a liquid injection pump in order, the first coal sample pot and the second coal sample pot respectively pass through a dispersion pipeline to connected with a fixed space, the pressure sensors are arranged on the upper part of the dispersion pipeline and in the fixed space, and a dispersion valve is arranged on the pipeline. The experiment apparatus can accurately control the liquid feeding amount, realizes the high pressure liquid feeding, besides water injection, realizes whole-process computer control, and has the advantages of high control precision and high experiment result accuracy, can simulate complete and real well coal body environment, and can fully satisfy the requirement of a liquid feeding experiment for coal body under the certain pressure adsorption state.

Description

technical field [0001] The invention relates to the technical field of coal gas adsorption and desorption measurement, in particular to an experimental device and a use method for quantitatively adding water to a coal body in an adsorption state with a certain pressure. Background technique [0002] At present, with the increase of coal seam depth and strength in coal mining, coal mining is becoming more and more difficult and dangerous, and the geological conditions of coal seam and gas occurrence are complicated, the coal seam has low air permeability, high gas content and high pressure, which poses a threat to coal mines. Therefore, it is often necessary to carry out gas drainage work at the same time as coal mining. In order to improve the drainage rate, anti-reflection drainage measures for coal seams can be implemented, and anti-reflection drainage is carried out. Before taking measures, it is necessary to have a certain degree of knowledge and understanding of the ori...

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Problems solved by technology

[0002] At present, with the increase of coal seam depth and strength in coal mining, coal mining is becoming more and more difficult and dangerous, and the geological conditions of coal seam and gas occurrence are complicated, the coal seam has low air permeability, high gas content and high pressure, which poses a threat to coal mines. Therefore, it is often necessary to carry out gas drainage work at the same time as coal mining. In order to improve the drainage rate, anti-reflection drainage measures for coal seams can be implemented, and anti-reflection drainage is carried out. Before taking measures, it is necessary to have a certain degree of knowledge and understanding of the original gas emission performance of the coal body, and the research on the gas emission performance of the coal body can find a technical means to restrain the gas emission to a certain extent, so as to prevent and control underground gas emission. Gas overrun

[0003] Most of the devices for measuring gas emission performance in the laboratory lack flexibility, and can only measure the gas emission performance of coal under one or several specific conditions, which is not conducive to exploratory research

For the measurement device of coal gas emission performance with added moisture, its disadvantages are obvious

The general liquid-adding devices in the laboratory are generally firstly added with liquid and then degassed, or firstly added with low-pressure liquid and then filled with high-pressure gas, which will cause water to be lost during the degassing process and affect the transfer of experimental results. , or the amount of added liquid cannot be precisely controlled, and the required experimental requirements cannot be met, and a laboratory environment consistent with downhole conditions cannot be truly realized. In addition, the problem of uneven liquid addition to the coal sample tank has not been effectively solved

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