Underground coal gasification (UCG) allows for the utilization of coal reserves not exploitable due to unfavorable geology and economic boundary conditions. The present study examines underground coal gasification economics converting deep-situated coals into a high-calorific UCG synthesis gas....

This paper presents a reactor model for combustion of CH4 with NiO/NiAl2O4 oxygen carriers in the Fuel Reactor of Chemical Looping Combustion (CLC) process. The model hydrodynamics is based on the two phase bubble - emulsion concept of bubbling fluidized beds, validated by residence time...

A novel procedure to perform carbon dioxide (CO2) gasification studies was tested with two different Alberta coals and compared to the most common procedures using thermogravimetric analysis (TGA). The designed experiments indicate that maximum reaction rates reported in the literature were...

In this paper, measurements of the CO₂ gasification kinetics for two types of Shenfu coal chars, which were respectively prepared by slow and rapid pyrolysis at temperatures of 950 °C and 1,400 °C, were performed by an isothermal thermo-gravimetric analysis under ambient pressure and elevated...

A pressurized wire-heating reactor (PWHR) that can provide experimental conditions up to pressures and temperatures of 50atm and 1750K, respectively, was developed to evaluate the intrinsic reaction kinetics of CO2 gasification for Berau sub-bituminous coal char (Indonesian coal) at elevated...

Lignite pyrolysis and gasification has been conducted in a semi batch reactor at reactor temperatures of 800–950°C in 50°C intervals. CO2 has been used as the gasifying agent for gasification experiments. The objective of this investigation is to understand the mechanism of syngas evolution...

Western Canada is endowed with considerable reserves of deep un-mineable coal, which can be converted to syngas by means of a gasification process called underground coal gasification (UCG). The syngas can be transformed into hydrogen (H2) through commercially available technologies employed in...

Underground coal gasification (UCG) is promising to be an important means of meeting the increasing energy demand in several countries. UCG is inherently an unsteady process since a number of parameters, such as the growth of the cavity, inherent variation in the properties of the coal along the...

Studies on the growth of three-dimensional cavity geometries in underground coal gasification (UCG) are important in exploiting the large fraction of coal that is present in underground coal seams. In the present study, the cavity formation in UCG has been simulated using experiments carried out...

Various options are considered to reduce CO2 emissions when utilizing deep coal by applying underground coal gasification (UCG), i.e., in combination with carbonation of synthetic minerals (CaO), conventional UCG followed by ex-situ separation of CO2 and upgrading the product gas using naturally...