Traditional coal mining and utilisation patterns are severely detrimental to natural resources and environments and significantly impede safe, low-carbon, clean, and sustainable utilisation of coal resources. Based on the idea of in situ fluidized coal mining that aims to transform solid coal into liquid or gas and transports the fluidized resources …
Underground coal gasification (UCG)/In-situ gasification (ISG) Underground coal gasification (UCG) also known as in-situ gasification (ISG) of coal takes place underground, generally below approximately 370 m. The underground setting provides both the coal feedstock source as well as pressures comparable to that in an above-ground …
Aiming at the in-situ measurement of the calorific value of coal, a method based on an open cyclic calorimeter was proposed and the related model was …
This paper conducts a thermodynamic study of the pyrolysis characteristics of tar-rich coal under an in situ environment. Typical thermodynamic functions of tar-rich coal, including the standard enthalpy …
The DAF heating value of feedlot manure, on average, is 15,000 kJ/kg (5000 Btu/lb) versus coal, which has a DAF heating value of 35,000 kJ/kg (14,000 Btu/lb). Even though the biomass has high VM contents, the heating values of biomass volatile are less than that of coal as shown in Table 8 (cf. Eq. (2)).
Summary. The thermal properties of coal are important in determining the applicability of coal to a variety of conversion processes. Calorimeters used for the …
ABSTRACT. Hydrogen production via in-situ injection of supercritical water into underground coal seams is a new coal conversion technology. This study proposes a solid-fluid-heat coupling mathematical model for the heating stage of the injection of supercritical water into the coal seam and studies the evolution law of the temperature …
Request PDF | An in-situ calorimeter for coal powder: A numerical investigation | Timely monitoring of the calorific value of coal is beneficial to combustion …
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.
Tar-rich coal in situ pyrolysis (TCISP) refers to the technology that upgrades oil and gas products by heat transfer through heat carriers (such as high-temperature nitrogen) under formation pressure without mining, as shown in Figure Figure1 1. The products are expelled through pores and fractures in the coal layer and finally flow out …
DOI: 10.1016/J.TCA.2021.179011 Corpus ID: 237655010; A method for in-situ measurement of calorific value of coal: a numerical study @article{Linglong2021AMF, title={A method for in-situ measurement of calorific value of coal: a numerical study}, author={Wang Linglong and Xue-cheng Wu and Xiang Gao and Yingchun Wu and Kefa …
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 ...
Calcium-looping is an attractive approach for removing CO 2 in flue gas from the coal-fired power plant to form CaCO 3.The integration of CO 2 capture via calcium-looping and in-situ dry reforming of methane with CaCO 3 allows the simultaneous CaCO 3 decomposition to regenerate CaO and syngas production. The produced syngas is …
Abstract. 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 ...
1. Introduction. Coal can be roughly graded into three types according to the tar yield obtained at temperatures from 500 to 700 °C. Coals having tar yields (x) of x ≤ 7%, 7% < x < 12%, and x ≥ 12% are tar-containing coal, tar-rich coal, and high-tar coal, respectively (Han and Yang, 1979, Yang and Ma, 2020).Western China is rich in tar-rich …
Target UCG site for the project is located in the Malkara region of the Tekirdağ province of Turkey and is managed by Uysal Mining Co. The coal seam selected for the UCG application is located 53 m deep in the underground and have an average thickness of 3.3 m.The results of the ultimate (C, H, O, N, and S content), approximate …
High temperature carbonisation is one of the main ways of coal utilisation. Small angle X-ray scattering (SAXS) with synchrotron radiation can be used for in-situ measurement of the carbon network structure change during heating coal. Recently, we developed a high temperature (1,200°C) furnace for in-situ SAXS measurements on …
The average temperature of the gas increases when the coal releases heat and reaches the peak (306 K). Then it starts to decrease at the end of coal combustion (t c = 230 s). As gas. Conclusion. Aiming at the in-situ measurement of the calorific value of coal, a method based on an open cyclic calorimeter was proposed and the related model …
In-situ investigation of coal particle fragmentation induced by thermal stress and numerical analysis of the main influencing factors ... and ε is the coal particle emissivity. Here, a value of ε = 0.85 is applied for the calculation [17], which is a characteristic value for ... The heat capacity of coal normally ranges from 0.2 to 0.4 cal …
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 …
The study aims to explore the kinetics of coal char during high temperature gasification by thermogravimetric analyzer and in situ heating stage microscope. Yangchangwan coal (YCW) and Shenfu coal (SF) were selected as the feedstock. The kinetics was fitted by using shrinking core, random pore, and homogeneous models, …
Coal calorific value is an important indicator in the combustion optimization of power plants and the calculation of operating efficiency. Hence, the in-situ measurement …
Abstract. Catalytic coal gasification for methane production is a promising technology in the clean coal utilization field. In this review, the technologies for coal-derived natural gas production, the catalytic coal gasification processes and the used reactors were compared. The compared catalysts mainly included single-component, composite ...
UCG is a is a combination of mining, exploitation and gasification that eliminates the need for mining and can be used in deep or steeply dipping, unmineable …
Abstract and Figures. Pyrolysis of Roland Seam (Wyodak) subbituminous coal has been investigated from 383 to 1273 K in an inert gas at 0.1 MPa (1 bar). The gas, liquid (condensibles at 0 °C) and ...
Also refers to the heat value of coal as expressed in Joules per kilogram (J/kg), kilojoules per kilogram (kJ/kg), British thermal units per pound (Btu/lb), or calories per gram (cal/g). ... in situ.--Refers to coal "in place" in the ground. in situ mining.--Utilization of coal by burning in place and extracting the gases, tars, and heat.
The ultimate and elemental properties of selected coal samples are shown in Table S1.According to Table S1, the volatile matter content of the coal samples is similar, however, the content of some key elements (i.e., hydrogen and oxygen) is different, suggesting the different pyrolysis behaviors of the coal samples.Specifically, JX coal has …
The in-situ heat injection test is conducted for the first time. ... Under the five desorption conditions, the t 0 values of the coal samples were 458, 346, 214, 84, and 53 min, which indicated that the time for water injection desorption to reach desorption equilibrium was the longest, whereas the time for heat injection desorption to reach ...
In situ underground pyrolysis of tar-rich coal is significant for alleviating the scarcity of oil and gas resources and realizing the green and efficient development and utilization of coal in China. Tar-rich coal is often subjected to high axial pressure, surrounding pressure, and pore pressure in the in situ underground pyrolysis …
The idea of recovering the energy values of coal by ill-situ processes. without the ... have been made for the recovery of the energy values in the coal by other means, for example as liquids (by solvent extraction, for example) but little real basis exists for ... some of the coal to provide heat (Fig. 11.1). Two boreholes are drilled and a ...
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 …
Underground coal thermal treatment (UCTT) is a promising concept that was recently proposed for extracting high-value hydrocarbon fuels from deep coal seams, which are economically unattractive for mining.UCTT is essentially an in situ pyrolysis process that converts underground coals into synthetic liquid and gaseous fuels, while leaving …
Compared with the actual values measured by the calorimeter, the value of the empirical formula (eq 3) is the closest, so the heat content of tar-rich coal is −23.83 MJ·kg –1, and the standard enthalpy of formation of tar-rich coal production is …
Heat injection strengthen desorption and relieve inhibition of water on gas. •. The in-situ heat injection test is conducted for the first time. •. Concentration and daily gas production are increased by 10 times and 100 times. •. The drainage stage after heat injection is the high yield period of gas drainage. •.
