The approach is demonstrated to measure greater than atmosphere pressures of N2 gas using a commercially available gas-flow stage.
This technique provides a means to ensure reproducible sample pressures between different experiments, and even between very differently designed gas-flow stages.
Yet, the restriction of solution gas flow at an intermediate stage increases the amount of dissolved gas, and, therefore, increases the gas solubility at previous stages.
In the case of the reference samples, a JEOL Cross Section Polisher IB-09010CP (JEOL, Tokyo, Japan) was used for 12 hours with a 4.0 kV accelerating voltage, 4.4 argon gas flow and a swinging stage.
The formulation assumes a quassi-steady-stage gas flow and a local equilibrium momentum balance.
Figure 3a illustrates that the proportion of the slit-shaped macropores in Jurassic low-rank coal reaches 31.66 % and the permeability of macropores reaches 10.34 mD, which promotes gas flow in high-pressure stages.
Large Langmuir volume means the adsorption and desorption abilities are strong, which is important to maintain stable gas production rate in late flow stage.
The larger the inter-porosity flow coefficient is, the lower the position of pressure curves and the larger the gas rate at the inter-porosity flow stage.
It was observed that the gas flow increased dramatically during the failure stage, and the corresponding increase ranges were more than 4.5 L/min, 1.4 L/min, and 0.3 L/min, respectively.
If the gas flow rate exceeds a certain threshold value, a second stage of the detachment takes place that follows the first spherical segment stage.
The compression subsystem has a three stage compressor with a rated gas flow rate of 5,2 Nm3/h and a delivery pressure of 360 bar.
