ERRORS OF MANOMETRIC CO2 SORPTION EXPERIMENTS ON COAL CAUSED BY ACCURACY OF PRESSURE SENSOR

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International Journal on Smart Sensing and Intelligent Systems

Professor Subhas Chandra Mukhopadhyay

Exeley Inc. (New York)

Subject: Computational Science & Engineering, Engineering, Electrical & Electronic

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VOLUME 9 , ISSUE 2 (June 2016) > List of articles

ERRORS OF MANOMETRIC CO2 SORPTION EXPERIMENTS ON COAL CAUSED BY ACCURACY OF PRESSURE SENSOR

Jiang Renxia / Yu Hongguan / Wang Li / Chen Lihui

Keywords : Pressure sensors, Measurement errors, Carbon dioxide, Sorption, Coal, Experimental uncertainty, Pressure effects, Manometers.

Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 9, Issue 2, Pages 468-490, DOI: https://doi.org/10.21307/ijssis-2017-879

License : (CC BY-NC-ND 4.0)

Received Date : 18-December-2015 / Accepted: 09-April-2016 / Published Online: 01-June-2016

ARTICLE

ABSTRACT

The accuracy of supercritical CO2 sorption determination on coal is important for estimating the CO2 sequestration potential of coal bed using CO2 injection into deep unminable coal seams. Based on the CO2 density change and CO2 sorption data of three selected coal samples, this paper investigates the effect of pressure-sensor accuracy on measurements of CO2 adsorption isotherms on coals with manometric equipment. The characteristic density-change of CO2 in proper pressure range determines a greater influence of pressure error on CO2 adsorption data on coal. The sensor accuracy has significant influence on Excess sorption increment of CO2 on coal in medium pressure (7-12 MPa), and on CO2 Excess-sorption isotherm at medium- and high pressure. The medium pressures with a greater CO2 density-change at a constant temperature in the sample cell are probably inevitable. A lower experiment-temperature will results in a greater measurement error of the sorption caused by pressure sensor accuracy. The pressure sensor accuracy may result in the less reproducibility and repeatability of CO2 adsorption on coals at medium- and high pressure, and negative sorption increment and even negative adsorption.

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