Device for automatically and synchronously measuring adsorption quantity and adsorption heat of high-pressure gas and determination method

Abstract

The invention discloses a device for automatically and synchronously measuring adsorption quantity and adsorption heat of high-pressure gas and a determination method. The device comprises a gas source sample system, a vacuum system, a synchronous adsorption quantity and adsorption heat measurement system and a data acquisition and automation control system. The determination method comprises thefollowing steps: determining a pressure change in the adsorption process by a high-precision pressure sensor in an equilibrium state, reaching adsorption equilibrium under constant temperature control, and combining a gas state equation to calculate the gas adsorption mole number or volume from an initial state to the equilibrium process; and outputting a dynamic curve changing along with time ina heat flux form by adopting a thermoelectric force difference of a multiple stereoscopic thermopile measurement reference cell and a sample cell, and combining a Clausius-Clapeyron equation to calculate the adsorption heat by virtue of instrument parameter correction and integral curves. The measuring device disclosed by the invention is stable, reliable, high in measuring accuracy, high in automation control degree and simple and convenient to operate, and the gas adsorption quantity and adsorption heat in the isothermal gas adsorption process can be synchronously measured.

Description

technical field [0001] The invention belongs to the field of gas-solid adsorption, and relates to a device and a measuring method for automatically and synchronously measuring high-pressure gas adsorption amount and adsorption heat. Background technique [0002] Coal is a porous organic rock that contains various mineral impurities and is cut by fractures, and is an excellent natural adsorbent. No matter in the process of coal formation or in the process of mining, it is accompanied by the adsorption and analysis of gas. The adsorption process releases heat and the desorption process absorbs heat. Therefore, the study of the kinetics and thermodynamic characteristics of coal to gas adsorption and desorption is helpful for the prevention and control of mine gas. Accidents have important theoretical and practical significance. When studying the gas adsorption process, the adsorption amount of the sample is small, the heat of adsorption is weak, and the test value varies great...

AI Technical Summary

Problems solved by technology

When studying the gas adsorption process, the adsorption amount of the sample is small, the heat of adsorption is weak, and the test value varies greatly and is unstable under dynamic changes, which makes on-site testing difficult, and the measurement error of the adsorption amount and adsorption heat of the gas-solid adsorption system is relatively large

In addition, the adsorption amount and the heat of adsorption usually need to be measured separately, so the measured adsorption amount and adsorption heat cannot accurately reflect the dynamic law of the same adsorption process.

[0003] Chinese patent application CN102607991A discloses a coal / shale adsorption measuring device, which measures the adsorbed gas content by the volumetric method, and can measure the isothermal adsorption of coal rocks in high-pressure gas, but cannot measure the heat of adsorption, and cannot measure coal rocks Other gas-solid adsorption outside the field, the thermodynamic adsorption process cannot be studied

Chinese patent application CN103278531A discloses a device for synchronously tracking and measuring micro-calorie changes in the gas-solid adsorption process. The device can simultaneously measure the gas adsorption amount and adsorption heat, but cannot realize the adsorption amount measurement under a constant temperature state, and cannot measure the isotherm adsorption line , and the heat of adsorption is calculated by integrating the temperature change curve, compared with the direct measurement method, the error is larger, and the heat loss in the gas flow process is not considered

In addition, the measurement operation of the above two devices has a low degree of automation and control, and the operation is cumbersome

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