in situ heat value of coal in Mexico

In-situ monitoring of the transformation of ash upon heating …

This low ashing temperature was used to ensure that AAEMs are kept in the ash to facilitate the study of morphological transformations upon heating. For coal samples and coal/biomass blends, the ashing was carried out following the approach adopted by many others [3, 9, 15]. The sample was heated from room temperature to 500 °C in 30 …

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Analysis of heat transfer performance and system energy …

DOI: 10.1016/j.energy.2024.130690 Corpus ID: 267743288; Analysis of heat transfer performance and system energy efficiency of catalytic combustion heaters for low calorific value waste gas application to oil shale in-situ conversion

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Thermodynamic Analysis on In Situ Underground …

To develop the in situ underground pyrolysis process of tar-rich coal more scientifically, the effect of temperature and pressure on the distribution of pyrolysis products should be clarified. This paper selected …

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A method for in-situ measurement of calorific value of coal: …

This research quantifies the effects of the experimental condition parameters on the measurement of coal calorific value based on laser ignition, which lays the …

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A method for in-situ measurement of calorific value of coal…

The measurement repeatability for heating value and initial deformation fusion temperature was within ± 76 Btu/lb and 33°F, respectively, for a range of heating values and fusion temperature ...

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In situ coal permeability and favorable development …

In general, the major coal basins in China contain different types of coal, ranging from less thermally matured lignite coal to high thermally matured anthracite coal, with R o values ranging from 0.2% to 4.4%. The formation of multi-rank coals is the result of multi-stage evolution and the superposition of multiple heat sources for metamorphism …

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2 Gasiﬁcation of Coal

some other gases with a heating value typically less than 300 Btu/scf. 2. Medium-Btu gas consisting of a mixture of methane, carbon monoxide, hydrogen, and various other gases with a heating value in the range of 300–700 Btu/scf. 3. High-Btu gas consisting predominantly of methane with a heating value of approximately 1000 Btu/scf. It is also ...

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A method for in-situ measurement of calorific value of coal: …

The temperature change in coal and graphite during heating and combustion by a CO2 laser heat source was measured using the multi-two-colour method. Laser …

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Underground in situ coal thermal treatment for synthetic …

The key problem of UCTT is the heat transfer in coal seams and the migration of pyrolysis products. Furthermore, permeability is critical for mass transfer; sufficient permeability is required to ...

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Coal Gasification

Eq. (5.21) represents the thermal decomposition of coal; it decomposes into volatile matter such as hydrogen and hydrocarbon gas and char (residual solid content composed of fixed carbon and ash). Eqs. (5.22) and (5.23) indicate combustion and partial combustion by reaction with oxygen, and supply heat of reaction required for gasification. Eqs. (5.24) …

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COAL IN MEXICO

From the lowest rank upward, including its heat potential in BTU's, coal is classified as lignite (together with brown coal, 7400 Btu), sub-bituminous (9,720 Btu), bituminous …

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Estimation of gross calorific value of coal: A literature review

The gross calorific value (GCV), also known as the higher heating value (HHV) of coal is the amount of heat emitted upon complete combustion of coal. The GCV of coal is used to estimate various technoeconomic parameters such as boiler efficiency, …

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Analyzing the role of in situ coal fire in greenhouse gases …

In situ coal fires significantly pollute the environment in many countries of the world. Monitoring these pollutants is challenging due to extensive area coverage and spatial variations. Thus, the present study demonstrates the method of deriving the spatial and temporal profiles of columnar density of three major greenhouse gases (carbon …

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An in-situ calorimeter for coal powder: A numerical …

Timely monitoring of the calorific value of coal is beneficial to combustion regulation during the operation of coal-fired power plants. An in-situ measurement …

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In-situ investigation of coal particle fragmentation induced by thermal

The heat capacity of coal normally ranges from 0.2 to 0.4 cal g −1 K −1 (0.82–1.64 kJ kg −1 K −1), 2. The heat capacity roughly decreases along with the increase in the carbon content, 3. The heat capacity increases markedly as the moisture content and temperature increase.

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Thermal surface characteristics of coal fires 1 results of in-situ

Coal fires lead to the emission of large amounts of green house relevant as well as toxic and health threatening gasses. Due to the volume loss underground coal fires lead to cracks in the overlying bedrock surface and can also cause land subsidence (Chen, 1997).As shown in Fig. 1, Fig. 3 it is through the cracks that hot gaseous emissions of …

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In-Situ Heat System Stimulates Paraffinic-Crude Producers in Gulf of Mexico

Summary. A thermal stimulation process that generates downhole heat currently is being used to stimulate oil wells in the Gulf of Mexico. The crude produced from these shallow wells is highly paraffinic. Previous attempts to stimulate these wells with paraffin solvents and acid systems have been unsuccessful. The in-situ heat process has yielded 10-fold …

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Transformation of aromatic structure of vitrinite with different coal

Three vitrinite samples of different rank, denoted as V-YJL, V-AW, and V-J15, were investigated by in situ heating while in a High resolution transmission electron microscope (HRTEM) to study the aromatic structural transformations from 200 to 800 °C. Thermogravimetry coupled with Fourier transform infrared spectroscopy and mass …

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A method for in-situ measurement of calorific value of coal: …

Highlights: • An in-situ calorimeter for coal is presented. • Heat transfer processes and measurement results under different working conditions are studies. • The relative …

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In-situ study of the heating rate effects on covalent bonds …

The evolutions of weight loss, weight loss rate and heat flow of SQ coal during pyrolysis with various heating rates are presented in Fig. 3 (a), 3(b) and 3(c), respectively. Fig. 3 (a) indicates that the depolymerization of SQ coal molecule initially take place at 300 °C when heating rates are both 15 and 20 °C/min. However, a slight ...

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In-Situ Processes: Underground Coal Gasification

The idea of recovering the energy values of coal by in-situ processes, without the intervention of human effort below ground and without bringing waste to the surface, is one which has exceptional appeal to the public. For this reason alone, a careful analysis of the possibilities is desirable, regularly renewed in the light of developing technology and …

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Structural Transformations of Coal at Low Temperature …

The 'C' value of samples with high oxygen content increased with temperature, caused due to the oxidation of aliphatic structures. The fitting areas of the 3600–3000 cm −1 region reduced with increasing coal rank. The aromatic structures changed more significantly with temperature in low-rank coal than in high-rank coal.

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Numerical Investigation of the Heat and Mass Transfer …

the in situ pyrolysis of oil-rich coal, leading to further energy savings and eﬃciency im-provements. 2. Model Description 2.1. Computational Domain and Boundary Conditions The actual production process of the in situ pyrolysis of oil-rich coal is shown in Fig-ure 1. Nitrogen gas is heated and injected into the fractured zone to heat the coal ...

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In-situ monitoring of the transformation of ash upon heating …

The fuel ratio (0.5–2.0), and higher heating values (16,100–19,000 kJ/kg) of coal and torrefied biomass were within the range useful for coal-fired plants. Additionally, ash analyses, ash fusion temperature, hygroscopic tendency, functional group study, and microstructural comparison were reviewed in this study.

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IN-SITU PROCESSES: UNDERGROUND COAL …

INTRODUCTION. The idea of recovering the energy values of coal by ill-situ processes. without the intervention of human effort below ground and without bringing waste to the …

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Estimation of gross calorific value of coal: A literature review

DOI: 10.1080/19392699.2024.2339340 Corpus ID: 269153347; Estimation of gross calorific value of coal: A literature review @article{Vilakazi2024EstimationOG, title={Estimation of gross calorific value of coal: A literature review}, author={Lethukuthula N. Vilakazi and Daniel Madyira}, journal={International Journal of Coal Preparation and …

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Numerical simulation on heat transfer characteristics during waste heat

DOI: 10.1080/10407782.2024.2344202 Corpus ID: 269314073; Numerical simulation on heat transfer characteristics during waste heat utilization after the underground in-situ pyrolysis of tar-rich coal

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Large-Scale Experimental Simulations of In Situ Coal …

This paper presents a series of surface experiments simulating underground coal gasification (UCG). The main goal of the experiments was to investigate the influence of the gasification medium and the coal rank on the gasification process. Four multi-day trials were carried out using a laboratory gasification facility designed for the large-scale …

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Evolution Mechanism of Macromolecular Structure in Coal during Heat

1. Introduction. The integrally structural arrangement of coal increases with proceeding coalification up to the formation of organic macromolecules of flat shape with carbon atoms in the central part [1 – 3].During coalification, the size of coal molecules increases as well as the degree of their ordering and macromolecules arrange …

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In-situ study on fragmentation of a single coal particle …

The thermal evolution characteristics of coal particles in the gasifier are closely related to the gasification efficiency of the gasifier, and coal particle fragmentation, as one of the major phenomena in the evolution process of coal particles, has an crucial impact on the mass and heat transfer process of coal particles [2]. Types of ...

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رقم 1688 ، طريق Gaoke شرق ، حي بودونغ الجديد ، شنغهاي ، الصين.

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