A brief review on coal reserves, production and possible non-power uses: The case of Mexico

Dávila-Pulido, G.I.; González-Ibarra, A.A.; Garza-García, M.

doi:10.1016/j.heliyon.2023.e16043

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…To test the wettability of the coal under different N 2 pressure environments, a contact angle measurement platform was developed based on the German KRÜSS Drop Shape Analyzer DSA 25 (Figure 2). The platform was newly constructed by adding four units, including 1 ⃝ a high-pressure chamber made of transparent glass to allow clear observation of the water drops for accurate contact angle testing, which was the key component; 2 ⃝ a gas-injection system for injecting gas into the pressure chamber; 3 ⃝ a manual waterinjection pump; and 4 ⃝ a sample adjustment system for conducting multiple measurements of one sample by adjusting the sample position. This platform can achieve contact angle testing under a gas atmosphere with pressures of 0-10 MPa, and the measurement range of the contact angle is 0-180 • , with an accuracy of 0.1 • (Table 2).…”

Section: Contact Angle Experiments Under Gas Atmospherementioning

confidence: 99%

“…CBM is a type of clean and unconventional natural gas that holds immense significance in its development and utilization. It offers significant contributions in supplying clean energy, mitigating coal-mine gas disasters, and reducing carbon emissions [1][2][3][4]. Permeability plays a crucial role in evaluating the production potential of CBM wells [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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The Wetting Characteristics and Microscopic Wetting Mechanism of Coal under High-Pressure Nitrogen Environment

Long,

Shi,

Cao

et al. 2024

Processes

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The wettability of coal is an important factor influencing hydraulic stimulation. Field-trial data has proven that high-pressure N2 injection plays a positive role in increasing the coalbed methane (CBM) production rate. For the purpose of investigating the mechanism by which N2 promotes the gas rate, multiple experiments were conducted sequentially on the wettability of anthracite under different N2 pressures. Testing of the coal surface contact angle was conducted under 0.1–8 MPa nitrogen pressure using a newly built contact angle measuring device. The coal samples were collected from the Xinjing Coal Mine in the Qinshui Basin, China. The test results revealed that the contact angle increased with increasing N2 pressure. That is, the contact angle was 77.9° at an N2 pressure of 0.1 MPa and gradually increased to 101.4° at an infinite N2 pressure. In contrast, the capillary pressure decreased with an increasing N2 pressure, from 0.298 MPa to −0.281 MPa. The relationship between the contact angle and N2 pressure indicates a reversal of the wettability, at 5.26 MPa, with a contact angle of 90° and a capillary pressure of 0 MPa. The capillary pressure reversed to a negative value as the N2 pressure increased. At the microlevel, a high N2 pressure increases the surface roughness of coal, which improves the ability of the coal matrix to adsorb N2, forming the gas wall that hinders the intrusion of water into the pores of the coal matrix. The results of this study provide laboratory evidence that high-pressure N2 injection can prevent water contamination and reduce the capillary pressure, thus benefiting coalbed methane production.

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Section: Contact Angle Experiments Under Gas Atmospherementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Wetting Characteristics and Microscopic Wetting Mechanism of Coal under High-Pressure Nitrogen Environment

Long,

Shi,

Cao

et al. 2024

Processes

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“…Though direct burning of coal leads to pollution and influences the climate, it is difficult to completely replace coal with clean energy in a short period of time. Even today, coal still plays a leading role in the energy structure of many countries [1][2][3] and is very important in ensuring the security of the world's energy resources. To address the issues of pollution and carbon emissions, the clean utilization of coal has been proposed [4].…”

Section: Introductionmentioning

confidence: 99%

Adhesion Behavior of Underground Coal Dust with Fused Silica: Effects of Relative Humidity and Particle Size

Zhou,

Yang,

Shang

2024

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Coal dust particles adhering to a camera lens reduce its light transmittance, which deteriorates the performance of the camera and may lead to serious problems with mining equipment that requires visual ability. Aiming at improving coal dust removal and cleaning technologies, the adhesion behavior of coal dust with fused silica is studied here. Experiments were conducted from microscopic and statistical points of view. The adhesion force between a single coal dust particle and fused silica is tested using atomic force microscopy (AFM), and the number and size distribution of large amounts of coal dust particles on fused silica are tested using a home-made adhesion experimental platform and image processing method. The results show that the adhesion force increases at high relative humidity (RH); it is dominated by van der Waals forces at low RH and capillary forces at high RH. The fused silica glass surface is predominantly covered by small-sized coal dust particles, and the total number of particles as well as the proportion of large-sized particles increases with RH. The theoretical values of van der Waals and capillary forces are significantly larger than the experimental values, owing to the irregular shape and roughness of the surface of the coal dust.

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Economic Challenges of Moving Beyond Fossil Fuels

Alipour,

Zandi Lak,

Rahimpour

2024

Encyclopedia of Renewable Energy, Sustainability and the Environment

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A brief review on coal reserves, production and possible non-power uses: The case of Mexico

Cited by 3 publications

References 23 publications

The Wetting Characteristics and Microscopic Wetting Mechanism of Coal under High-Pressure Nitrogen Environment

The Wetting Characteristics and Microscopic Wetting Mechanism of Coal under High-Pressure Nitrogen Environment

Adhesion Behavior of Underground Coal Dust with Fused Silica: Effects of Relative Humidity and Particle Size

Economic Challenges of Moving Beyond Fossil Fuels

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