Coal/shale isothermal adsorption experimental device

Abstract

The invention provides a coal / shale isothermal adsorption experimental device, wherein the output hole of a reference kettle and the first port of an intermediate area are connected through a first valve; the second port of the intermediate area and a gas storage tank are connected through a second valve; a third valve is arranged at the third port of the intermediate area; the fourth port of the intermediate area and a sample kettle are connected through a fourth valve; the reference kettle, the sample kettle, a temperature sensor, the gas storage tank and the intermediate area are arranged in a constant-temperature control box; a filter net is arranged at the output hole of the sample kettle; a first pressure sensor is used for obtaining the pressure value in the reference kettle; the second pressure sensor is used for obtaining the pressure valve in the sample kettle; the temperature sensor is used for precisely measuring the temperature value in the adsorption experimental process; the gas storage tank is used for pre-heating gas required in the adsorption experimental process before entering the reference kettle and the sample kettle; the intermediate area is used for gradually decreasing the pressure of the reference kettle and gradually increasing the pressure of the sample kettle, and therefore, the adsorption amount under different sample kettle pressures after adsorption equilibrium for many times is obtained.

Description

technical field [0001] The invention relates to the field of adsorption measurement, in particular to a coal / shale isothermal adsorption experiment device. Background technique [0002] At present, there are two main experimental methods for measuring gas adsorption isotherms: volumetric method and gravimetric method. Among them, the volumetric method is divided into constant volume type and constant pressure type according to different gas injection methods. [0003] Constant volume volumetric method, as the most commonly used method, its experimental device is mainly composed of gas cylinders, vacuum pumps, booster pumps, reference kettle, sample kettle, pressure and temperature sensors, and thermostat box. Inject the adsorbate gas into the medium, record the pressure of the reference tank after the pressure is stable, then open the intermediate valve between the reference tank and the sample tank, let the gas expand isothermally and enter the sample tank, wait for the ad...

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Problems solved by technology

[0009] The experimental equipment required by the traditional volumetric method is simple and easy to operate, but the experimental operation of multiple gas injections will cause multiple accumulations of measurement errors, resulting in large experimental errors in measurement results, which may eventually cause abnormal adsorption isotherms. This method is only suitable for adsorbents (such as activated carbon, etc.) with large adsorption capacity (small measurement error), and it will cause large errors in the measurement of coal / shale with very low adsorption gas capacity, which will seriously affect the experimental results.

Although the patent CN102607991A has the ability to measure the adsorption capacity of coal / shale, and proposes the use of pneumatic valves for automatic program control to simulate high reservoir pressure, but its principle is the constant volume volume method, the error of the measurement results is still large, and the Can not guarantee accurate measurement of adsorption capacity of different gases in coal / shale under actual formation conditions such as high temperature and high pressure

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