Marc Mostade

University of Liege, Engineering, Faculty Member

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Phone: +32475746378
Address: 13, rue Wiertz
4000 Liège
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Papers by Marc Mostade

European project of underground coal gasification in Spain

International Conference on Multimedia Information Networking and Security, Mar 1, 1994

Underground coal gasification

Elsevier eBooks, 2023

Carbon stable isotope analysis as a tool for training temperature during el Tremedal underground coal gasification at great dept

Peer reviewe

Carbon stable isotope analysis as a tool for training temperature during el Tremedal underground coal gasification at great dept

Peer reviewe

99/00378 Underground coal gasification modelling activities in Belgium

Fuel and Energy Abstracts, 1999

By-products related to fuels 1073 K and holding time from 5 min to 60 min. The coal char surface ... more By-products related to fuels 1073 K and holding time from 5 min to 60 min. The coal char surface was studied by means of TPD and TGA with COz. Different stability of CO complex was observed The lower activation energy of the 'unstable' CO complex is very useful for COz gasification. The CO complex can be regarded as an 'active site'. It was also found that the condition of char preparation affects the surface property. Longer holding time can produce less CO complexes on the char surface, and the char has lower reactivity. 99i90374

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Belgo-German Thulin UCG Trial - Summary Report

Underground Coal Gasification: Looking ahead to commercialisation

Underground coal gasification (UCG) or In-situ coal gasification (ISCG) is the gasification of co... more Underground coal gasification (UCG) or In-situ coal gasification (ISCG) is the gasification of coal in-situ, which involves drilling boreholes into the coal and injecting water/air or water/oxygen mixtures. It combines an extraction (mining) process and a conversion (gasification) process into one step, producing a high-quality, affordable synthetic gas, which can be used for power generation, or manufacture liquid fuels, synthetic natural gas and industrial chemicals. Still in the early stage of commercialisation, UCG is poised to become a future major contributor to the energy mix in countries around the world.

Modeling of the chemical processes in a longwall face underground gasifier at great depth

in Situ, 1993

In order to simulate the cavity growth of an underground gasifier in thin seams, at great depth, ... more In order to simulate the cavity growth of an underground gasifier in thin seams, at great depth, Wilks1,2 has developed an original model based on the distribution of fluid flows around an injection well. In this paper, we aim to introduce within this model a description of chemical processes on the wall and within the fluid phase, in order to determine the temperature and concentration profiles along the coal wall. These profiles are dependent only on two factors: the transfer coefficients and the energy balance of the gas generator. A study of the sensitivity of the operating variables has been carried out.Peer reviewe

Belgian-German Field Test Thulin - Results of gasification

The Thulin bituminous coal deposit at 870 m depth has been opened by 4 vertical wells (distance 3... more The Thulin bituminous coal deposit at 870 m depth has been opened by 4 vertical wells (distance 35 m). From one of these wells an in-seam drainhole has been drilled towards the production well and a perfect link could be established between both wells. After initiating self-ignition, enlarging the reacting volume and bringing the reactive area nearer to the production well, the injected flow was gradually raised and then changed into an oxygen-foamy water mixture. A quick and considerable decrease of the permeability was observed at the very beginning. The injection pressure rose to 190 bar and the pressure at the production well was kept most of the time at 40 bar. The authors found that mainly due to the high overburden pressure, the in-seam drainhole collapsed and that consequently the following processes were conducted in filtration mode. Manipulation on back pressure and enlargement of the cavity by burning at the production well bottom influenced the permeability. The gasifica...

Towards commercialising underground coal gasification in the EU

Environmental Geotechnics, 2017

Modern ‘enabling technologies’ and over a century of research and development have pushed undergr... more Modern ‘enabling technologies’ and over a century of research and development have pushed underground coal gasification (UCG) beyond the proof-of-concept phase. Lessons learned from previous trials have demonstrated that UCG can exploit the energy stored in coal efficiently and with limited environmental impact compared with conventional coal-based energy technologies. Many countries in the EU (and worldwide) struggle to meet their energy needs despite containing very large reserves of coal, which cannot be exploited conventionally because of its depth. Application of modern UCG techniques, state-of-the-art drilling and monitoring technologies offer the opportunity to extract the energy from deep coal resources economically and with limited environmental impacts; however, several hurdles, such as public opinion and carbon dioxide (CO2) emission limits, must be overcome before UCG can be commercialised in the EU. Continued support by member states will attract more private investment...

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99/00251 Drilling, well completion and engineering activities in preparation of the first underground coal gasification trial in the framework of a European community collaboration, Alcorisa, Spain

Fuel and Energy Abstracts, 1999

Gaseous fuels (sources, properties, recovery, treatment) be solved, the sulfides will significant... more Gaseous fuels (sources, properties, recovery, treatment) be solved, the sulfides will significantly reduce the activities of catalysts applied in downstream processes such as synthesis of methanol, ammonia and urea. It is necessary to reduce sulfur compounds to as low as 0.5-l ppm after the synthesis gas is treated using wet method desulfurization processes and water-gas shift reaction process, the sulfur compound (HsS, COS and CSs) levelis 3-30 ppm. In the laboratory a number of dry methods to remove HIS, COS and CSs have been developed. B9l00250 Developmental shallow to dea geolo y of coalbed methane from Matanuska bas n, Maska, U.S.A. and Canada P

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The use of BEM in the cavity growth calculation of an underground gasifier at great depth

A numerical model for the simulation of Underground Coal Gasifier cavity growth at great depth ha... more A numerical model for the simulation of Underground Coal Gasifier cavity growth at great depth has been developed. The model is based on the coupling of the Boundary Element Method (BEM) for Darcy flow and the numerical solution of mass and energy balances of an heterogeneous chemical reactor. The BEM is a particularly well suited method to solve the problem, because it focuses on phenomena occuring at movable boundaries where a non-uniform Neumann condition is determined by chemical reactions.

Flow Modeling in An Underground Gasifier At Great Depth By the Boundary-element Method

in Situ, 1994

In order to simulate the cavity growth of an underground gasifier in thin seams at great depth, W... more In order to simulate the cavity growth of an underground gasifier in thin seams at great depth, Wilks1 has developed an original model that solves the continuity equation in the horizontal plane with the hypothesis of radial fluid flow around the injection well. In the model presented here, the continuity equation in the horizontal plane has been taken into account, removing the limiting assumption on flow (radial direction) assumed by Wilks. The simultaneous solution of the continuity equation and the Darcy law has been carried out using the Boundary Element Method (BEM); this method is particularly suitable for solving problems where boundary conditions are of prime importance. The model enables the influences of the permeability of the medium and gasifier geometry to be demonstrated.

Study of the cavity development during the ``El Tremedal`` underground coal gasification trial at great depth

During the underground coal gasification experiments at Alcorisa, a series of tracer tests using ... more During the underground coal gasification experiments at Alcorisa, a series of tracer tests using helium as injected material were effected. These tests illustrated the hydrodynamics of the flow profile inside the underground reactor during the main operating periods. The models developed to simulate the flow conditions are based on the material exchange between flowing fluid and a dead zone. The dead zone is represented by a homogeneous porous zone exchanging material with the flowing fluid by diffusion. The reactor volume calculated from the tracer results increases with the cumulative quantity of oxygen injected.

Groundwater Management During Intermediate-to-Deep Underground Coal Gasification

Egu General Assembly Conference Abstracts, May 1, 2010

Underground coal gasification (UCG) is a safe, economic way to extract energy from coal with sign... more Underground coal gasification (UCG) is a safe, economic way to extract energy from coal with significant environmental benefits compared with other coal-based energy production methods. However, in the wrong hands, UCG can adversely impact groundwater systems in two ways: 1) by contamination with inorganic and organic compounds; and 2) groundwater depletion. The hydrogeological conditions of UCG are highly site-specific and

MODELING OF THE CHEMICAL PROCESSES IN A LONGWALL FACE UNDERGROUND GASIFIER AT GREAT DEPTH

In order to simulate the cavity growth of an underground gasifier in thin seams, at great depth, ... more In order to simulate the cavity growth of an underground gasifier in thin seams, at great depth, Wilks has developed an original model based on the distribution of fluid flows around an injection well. In this paper, we aim to introduce within this model a description of chemical processes on the wall and within the fluid phase, in order to determine the temperature and concentration profiles along the coal wall. These profiles are dependent only on two factors: the transfer coefficient and the energy balance of the gas generator. A study of the sensitivity of the operating variables has been carried out.

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FLOW MODELING IN AN UNDERGROUND GASIFIER AT GREAT DEPTH BY THE BOUNDARY ELEMENT METHOD

In order to simulate the cavity growth of an underground gasifier in thin seams at great depth, W... more In order to simulate the cavity growth of an underground gasifier in thin seams at great depth, Wilks has developed an original model that solves the continuity equation in the horizontal plane with the hypothesis of radial fluid flow around the injection well. In the model presented here, the continuity equation in the horizontal plane has been taken into account, removing the limiting assumption on flow (radial direction) assumed by Wilks. The simultaneous solution of the continuity equation and the Darcy law has been carried out using the Boundary Element Method (BEM); this method is particularly suitable for solving problems where boundary conditions are of prime importance. The model enables the influences of the permeability of the medium and gasifier geometry to be demonstrated.

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A COUPLING OF CHEMICAL PROCESSES AND FLOW IN VIEW OF THE CAVITY GROWTH SIMULATION OF AN UNDERGROUND COAL GASIFIER AT GREAT DEPTH

In order to simulate the cavity growth of an underground gasifier in thin seams at great depth, a... more In order to simulate the cavity growth of an underground gasifier in thin seams at great depth, an original model has been developed. This model combines a representation of flow through rubble and ash in a central zone surrounding the gasifying agent injection point, with the calculation of chemical processes in a peripheral zone adjacent to the coal wall. The model facilitates the determination of the cavity shape evolution, as well as the evolution of temperature and concentration profiles along the coal wall. The influence of several parameters can be evaluated: gasifying agent flow and composition, distance between wells, recovery pressure, coal composition, water intrusion, etc… The permeability ratio between the gasifier central and peripheral zones is crucial. Results are in good accordance with expectation.

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Review of Environmental Issues of Underground Coal Gasification

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ASSESSING BELGIUM'S CBM POTENTIAL

Despite experience in gathering mine gas and gas storage in collieries, no CBM production is actu... more Despite experience in gathering mine gas and gas storage in collieries, no CBM production is actually envisaged in Belgium. After an inconclusive CBM test in 1994, studies focused on the enhancement of productivity and modelling gas production. However, the sequestration of CO2 either in closed collieries or in virgin coalfields may have the potential to restart CBM activity in Belgium.

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