Measuring method and device for gas adsorption capacity and adsorption deformation of coal rock under stress conditions

Abstract

The invention discloses a method and a device for measuring gas adsorption quantity and adsorption deformation of coal rock under a stress condition. The method comprises the following steps of: processing the coal rock into a cylindrical sample; wrapping the cylindrical sample, a gasket and the base of a sample tank through a sealing material; vacuumizing; filling gas in a gas injection meteringpump; opening an ambient pressure control metering pump, injecting ambient pressure liquid in the tank, and recording volume and pressure of liquid in the ambient pressure control metering pump; opening the gas injection metering pump; injecting gas; recording volume and pressure of gas in the gas injection metering pump; and calculating the adsorption quantity and the adsorption deformation. A sub-system is connected with a valve in a fluid injection and control sub-system. The sub-system is connected with a fluid passage hole in a tank sub-system through a stainless steel pipe. The valve inthe sub-system is connected with a four-way in the fluid injection and control sub-system. The ambient pressure control metering pump in the fluid injection and control sub-system is respectively connected with an acquisition card in a data acquisition sub-system through a cable. The method and device disclosed by the invention has the advantages of simple principle, clear structure, simple and convenient operation and accurate and credible result.

Description

technical field [0001] The present invention relates to the technical field of testing coal rock characteristics, more specifically to a method for measuring the gas adsorption and adsorption deformation of coal rock, and also to a device for measuring the gas adsorption and adsorption deformation of coal rock, especially a suitable A method and device for measuring the adsorption capacity and adsorption deformation of coal rock gas under different stress conditions. Background technique [0002] Due to the large number of pores in its structure and the large surface area, coal rock has the ability to adsorb gas. A large number of studies have shown that coal rocks will deform after adsorbing gas, which will affect the pore structure of coal rocks, and then affect the flow parameters such as the permeability of coal rocks, thereby affecting the coalbed methane (CH 4 ) mining. [0003] The adsorption deformation is caused by the adsorption of gas by coal rocks, so the study...

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Problems solved by technology

[0003] The adsorption deformation is caused by the adsorption of gas by coal rocks, so the study of coal rock adsorption deformation must be related to the adsorption amount, and the relationship between coal rock adsorption deformation and adsorption amount must be established, so the coal rock gas adsorption amount and adsorption deformation must be measured simultaneously, and At present, there are few studies in this area

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