A Uniaxial Compression Experiment with CO<sub>2</sub>-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System

Weitao Hou; Hanpeng Wang; Wei Wang; Zhongzhong Liu; Qingchuan Li

doi:10.3791/59405

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constan...

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A Uniaxial Compression Experiment with CO₂-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System

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10:27 min

June 12, 2019

DOI: 10.3791/59405-v

Weitao Hou¹, Hanpeng Wang¹, Wei Wang¹, Zhongzhong Liu¹, Qingchuan Li¹

¹Research Center of Geotechnical and Structural Engineering,Shandong University

Overview

This protocol demonstrates the preparation of a briquette sample and the execution of a uniaxial compression experiment under varying CO2 pressures. It aims to explore the physical and mechanical property changes in coal due to CO2 adsorption.

Key Study Components

Area of Science

Geological sequestration
Coalbed methane recovery
Gas-solid interactions

Background

This method addresses the relationship between coal properties and gas adsorption.
Static and dynamic loads can be applied to briquettes in a constant volume state.
The entire experimental process is visualized through photographic monitoring.
The method is applicable to any porous rock species.

Purpose of Study

To investigate the effects of CO2 on coal's physical and mechanical properties.
To provide insights into carbon dioxide geological sequestration.
To enhance understanding of coalbed methane recovery processes.

Methods Used

Weigh 1000 grams of pulverized coal with a particle size of 0-1 mm and 300 grams with a size of 1-3 mm.
Mix the coal in a beaker in a mass proportion of 0.76 to 0.24.
Prepare cement by mixing sodium humate powder with distilled water.
Conduct uniaxial compression experiments under controlled CO2 pressures.

Main Results

The method allows for the visualization of the experimental process.
Static and dynamic loads can be effectively applied to the briquette samples.
Changes in coal properties due to CO2 adsorption were observed.
The technique is versatile for testing various porous rocks.

Conclusions

This protocol provides a reliable method for studying coal properties under CO2 conditions.
It contributes valuable data for carbon sequestration and methane recovery research.
The experimental setup can be adapted for different sample types.

Frequently Asked Questions

What is the main advantage of this technique?

The technique allows for the application of static and dynamic loads in a constant volume state while visualizing the entire process.

Can this method be applied to other types of rocks?

Yes, the method can be applied to mechanical tests of any porous rock species.

What is the significance of CO2 adsorption in this study?

CO2 adsorption is crucial for understanding the physical and mechanical changes in coal, which is important for geological sequestration and methane recovery.

How is the briquette sample prepared?

The briquette sample is prepared by mixing specific proportions of pulverized coal with a defined particle size distribution.

What measurements are taken during the experiment?

Measurements of physical and mechanical properties of the coal under different CO2 pressures are taken during the uniaxial compression tests.

Is there a specific requirement for the coal species used?

No, there are no specific requirements for the species of the coal sample used in this method.

This protocol demonstrates how to prepare a briquette sample and conduct a uniaxial compression experiment with a briquette in different CO₂ pressures using a visualized and constant-volume gas-solid coupling test system. It also aims to investigate changes in terms of coal’s physical and mechanical properties induced by CO₂ adsorption.

This method can help answer key questions in field of carbon dioxide geological sequestration and coalbed methane recovery about the relationship between coal's properties and gas adsorption. The main advantage of this technique is that static and dynamic load can apply on briquette in constant volume state and whole experiment process is visualized by photographic monitoring. There is no particular requirement for the species of the sample, therefore this method can apply to mechanical tests of any porous rock.

To begin, weigh 1000 grams and 300 grams of pulverized coal with a particle size distribution of zero to one millimeter and one to three millimeters respectively. Put them together in a beaker in a mass proportion of 0.76 to 0.24 and use a six millimeter diameter glass rod to mix them well. To prepare the cement, put four grams of sodium humate powder into a beaker and add approximately 96 millimeters of distilled water.

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