1. Introduction. Coal is the most sufficient fossil fuel and accounts for about 27% of energy consumption all over the world in 2020. 1 However, considering the increasingly urgent demand for environmental protection, the conventional method of coal mining and utilization should be replaced. Another alternative process is underground coal gasification (UCG), which is more environmentally ...
Aquathermolysis of bitumen occurs when it is thermally cracked in the presence of water. Current in situ technologies for bitumen production, such as Cyclic Steam Stimulation and SteamAssisted Gravity Drainage, inject high pressure, high temperature steam in the reservoir to heat the bitumen which in turn lowers its viscosity enabling flow to a production well.
UNDERGROUND COAL GASIFICATION INTRODUCTION The idea of recovering the energy values of coal by illsitu processes. without the ... progress, especially in the USA, should allow the potential of the process to be defined with a reasonable degree of accuracy by about 1983. Within the last few years, in addition to aesthetic considerations, a new ...
This study provides an overview of the systematic methods of the in situ coal gasification process. Furthermore, the model of the porous structure of coal has been presented and the gas movement taking place in the carbon matrix—which is part of the bed—has been described. The experimental tests were carried out with the use of air forced ...
article{osti_, title = {A new approach of reduction of carbon dioxide emission and optimal use of carbon and hydrogen content for the desired syngas production from coal}, author = {Lu, Wenyang and Cao, Qingxi and Xu, Bang and Adidharma, Hertanto and Gasem, Khaled and Argyle, Morris and Zhang, Fan and Zhang, Yulong and Fan, Maohong}, abstractNote = {We report this research is designed ...
Increasing global energy demand is a central challenge of the 21st century. Apart from renewable energy concepts, sustainable bridging and buffering technologies are needed which simultaneously offer longterm energy supply guarantees. Underground coal gasification (UCG) shows a promising potential to meet these requirements of future energy markets by in situ conversion of coal to a valuable ...
In situ gasification chemical looping combustion (iGCLC) was a promising way to inherently sequestrate CO 2. Due to the nitrogen in coal, the NOx emission was a key issue in this study, we aimed to identify the nitrogen conversion and distribution characteristics in two elementary stages of coal conversion (pyrolysis and subsequent char gasification) during the i GCLC process in a ...
Request PDF | In situ gasification of coal, a natural example: history, petrology, and mechanics of combustion | A 6 m thick coal seam of the Upper Jurassic and Lower Cretaceous Mist Mountain ...
Catalytic coal gasification for methane production is a promising technology in the clean coal utilization field. In this review, the technologies for coalderived natural gas production, the catalytic coal gasification processes and the used reactors were compared.
Gas properties Gas content. One of the factors affecting the energy release potential of coal is gas content. Gas content is the summation of free and adsorbed gas in coal and is recognized as the key parameter used for determining outburst propensity (Lama 1995).In Australia, gas content is used alone to define a Threshold Limit Value (TLV) in coal mines to assess outburst risks.
In situ combustion (ISC) and in situ gasification (ISG) are enhanced recovery methods to produce hydrocarbons involving the injection of an oxidant into the formation and the production of a hydrocarbon. ISC is a method developed to recover oil resources.
Its main focus was the theoretical and experimental development of in situ production of hydrogenrich gas from coal using underground gasification. A followup project HUGE2 (201114), which was also financed by RFCS, focused on the environmental and safety aspects associated to the UCG process, including underground water contamination and ...
In industrial chemistry, coal gasification is the process of producing syngas —a mixture consisting primarily of carbon monoxide (CO), hydrogen ( H2 ), carbon dioxide ( CO2 ), methane ( CH4 ), and water vapour ( H2O )—from coal and water, air and/or oxygen. Historically, coal was gasified to produce coal gas, also known as "town gas".
gasifier. (Show more) coal gasification, any process of converting coal into gas for use in illuminating and heating. The first illuminating gas was manufactured from coal in England in the late 18th century by the process of carbonization or destructive distillation, heating coal in the absence of air, leaving a residue of coke as a byproduct.
EXAMPLE A conventional in situ coal gasification process for the production of a high calorific synthetic gas may be initiated utilizinga starting mixture of mole of water to yield a product gas at atmosphere and I,800F. A similar process may be initiated utilizing the improved process of the present invention wherein a mixture of ...
This chapter deals with coal gasification, which is a process that converts carbonaceous materials, such as coal, petroleum, petroleum coke, or biomass, into carbon monoxide and hydrogen.
The underground coal gasification (UCG) technology converts coal into product gas and provides the option of environmentally and economically attractive coal mining. Obtained syngas can be used for heating, electricity, or chemical production. Numerous laboratory coal gasification trials have been performed in the academic and industrial fields. Labscale tests can provide insight into the ...
As mentioned above, different combinations or concentrations of gasification agents are applied in biomass gasification technologies. The use of one or another gasification agent leads to a different composition of product gas, so the choice among them is made based on a balance between the final product gas specification (for downstream application) and process costs [14].
The Chinese government has authorized an underground coalgasification project in Lineng of Shandong Province recently. This is a model project combining insitcoal gasification and gasfired power generation., as well as being of interest to the British, the Australians and ourselves, to name but a few.
In situ coal gasification: a unique means of energy recovery. United States: N. p., 1976. Web. Copy to clipboard. Schrider, L A, Fischer, D D. ... using both air and oxygen/steam injection: both low and mediumBtu gas were produced. The process wells were spaced 18 m (60 ft) apart and completed within m (5 ft) of the bottom of the m ...
Underground coal gasification (UCG) is the process of converting hydrocarbon materials into synthesis gas insitu. The process has been developed over more than a century and many aspects of the process are well understood. Despite this, no large scale commercial UCG plants have been constructed recently, with only one Sovietera plant from the ...
The Process Intensification for Syngas Hydrogen key technology area addresses control of chemical reactions in increasingly modular and intrinsically efficient reactors, allowing for streamlined processes with wellcoordinated unit operations, and with a focus on gasification of biomass and carbonaceous wastes into syngas, s.
The Underground Coal Gasification (UCG) offers a clean source of energy by converting coal/lignite insitu into syngas that can be used either as a fuel or as a chemical feedstock [2]. The UCG has the potential to utilize coal and lignite resources which are inaccessible due to depth and are uneconomical to extract using the conventional mining ...
The coal face is ignited, and the high temperatures (about 1,200°C) from the combustion and limited oxygen causes nearby coal to partially oxidize into hydrogen, carbon monoxide (CO), carbon dioxide (CO 2 ), and minimal amounts of methane (CH 4) and hydrogen sulfide (H 2 S).
© DZCrusher - كل الحقوق محفوظة
