References of "Dumont, Marie-Noëlle"
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See detailAssessing the environmental potential of carbon dioxide utilization: A graphical targeting approach
Dumont, Marie-Noëlle ULg

Conference (2012, July)

Carbon Capture and Utilization (CCU) has the potential to reduce both greenhouse gas emissions and fossil fuel use. However, the conversion of CO2 is intrinsically difficult due to its low energetic state ... [more ▼]

Carbon Capture and Utilization (CCU) has the potential to reduce both greenhouse gas emissions and fossil fuel use. However, the conversion of CO2 is intrinsically difficult due to its low energetic state. Thus, a positive environmental effect of a CO2-consuming reaction cannot be taken for granted. In this work, we therefore present a graphical method to identify promising reaction schemes using CO2 as a feedstock. Reactant mixtures leading to minimal life-cycle greenhouse gas (GHG) emissions are determined. The optimal reaction schemes strongly depend on the reactants’ global warming potential (GWP); in the case of CCU, the future GWP values of CO2 and H2 are particularly critical and subject to major uncertainty today. The graphical method therefore provides GWP targets for CO2 capture and H2 production technologies. The method is demonstrated for the production of methanol. Five optimal reaction schemes are identified depending on the GWP values of CO2 and H2. Thus, four threshold relations for the GWP of CO2 and H2 are derived showing directly under which conditions the utilization of CO2 as a feedstock is environmentally preferential. [less ▲]

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See detailAssessing the environmental potential of carbon dioxide utilization: A graphical targeting approach
Dumont, Marie-Noëlle ULg; der Assen, Niklas Von; Sternberg, André et al

in Computer Aided Chemical Engineering (2012)

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See detailAdaptation and testing of data reconciliation software for CAPE-OPEN compliance
Radermecker, Eric; Dumont, Marie-Noëlle ULg; Heyen, Georges ULg

in Computer Aided Chemical Engineering (2009), 26

The experience gained in the development of a CAPE-OPEN 1.0 thermo socket for the BELSIM-VALI software is presented. A material object has been developed and interfaced with the modelling code. The user ... [more ▼]

The experience gained in the development of a CAPE-OPEN 1.0 thermo socket for the BELSIM-VALI software is presented. A material object has been developed and interfaced with the modelling code. The user interface has been adapted. Several case studies were analysed, with performance comparison between the native thermodynamic model, and properties obtained from several CAPE-OPEN thermo plugs. [less ▲]

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See detailDEVELOPMENT OF A CAPE-OPEN 1.0 SOCKET
Radermecker, Eric; Wising, Ulrika; Dumont, Marie-Noëlle ULg

Conference (2008, November)

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See detailSimulation et aide au dimensionnement des chaudières de récupération
Dumont, Marie-Noëlle ULg

Doctoral thesis (2007)

Heat recovery steam generators (HRSG) play a very important role in combined cycle (CC) power plants, where steam is generated from a gas turbine exhaust and supplied at the appropriate pressure and ... [more ▼]

Heat recovery steam generators (HRSG) play a very important role in combined cycle (CC) power plants, where steam is generated from a gas turbine exhaust and supplied at the appropriate pressure and temperature to steam turbines for further power generation. The power plants achieve an overall efficiency above 55% and are ideally suited for combined heat and power generation in utility systems. The performance of energy conversion is improved by reducing exergy losses which implies reducing the temperature difference between the combustion gas and the steam cycle. Thus recent HRSG designs include up to three pressure levels with reheat in the steam cycle for maximum energy recovery and the use of high pressure, high temperature superheater and reheater in CC plants. Super critical boilers are also conceivable. Since HRSG performance has a large impact on the overall efficiency of the CC power plant, an accurate simulation of the performance of the HRSG is necessary. We present a steady state HRSG model to support design and rating simulations of vertical units. The simulation model, called FELVAL, divides the boiler in its rows. The row model can also be divided several times following the tube length, to better estimate the fumes temperature distribution across the hot gas path. Another model, called SUFVAL, carries out the design as well as the automatic generation of the FELVAL units and all the needed connections. The log mean temperature difference (LMTD) method and the effectiveness-NTU (ε -NTU) method are alternatively used to compute the overall heat transferred in each part of the HRSG. The problem of convergence of boiler models with more than one row in parallel is discussed. Good initialisation of the different variables is crucial to obtain convergence. The models are tested on 2 references HRSG. The first one is an assisted circulation boiler that operates at 3 subcritical pressure levels. The second is a once through boiler able to operate above the critical pressure of water. These new models were introduced into a commercial software of data reconciliation (VALI of Belsim sa) already used by the engineering and design departments of a HRSG manufacturer. They thus have a general-purpose package enabling them to make design, data reconciliation and simulation with the same software. Moreover, the use of FELVAL model will enable them to simulate any type of boiler and to obtain informations on the change of the temperatures inside the heat exchangers. This information is crucial for well monitoring closely the operation of a boiler, and better understanding its behaviour. This knowledge improvement allows to limit the overdesign and the safety margins and to reduce the investment costs. [less ▲]

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See detailRow by row simulation of heat recovery steam generators : comparing different types of initialization as well as the LMTD and ε-NTU simulation method
Dumont, Marie-Noëlle ULg; Heyen, Georges ULg

Conference (2007, May)

We developed a model which makes it possible to simulate a boiler rows by row. This model as well uses the European approach of log mean temperature difference as the American approach of effectiveness ... [more ▼]

We developed a model which makes it possible to simulate a boiler rows by row. This model as well uses the European approach of log mean temperature difference as the American approach of effectiveness-number of transfer unit. These approaches are compared in term of results and speed of calculation. We also present the difficulties encountered and some means of circumventing them. Some cases of superheater are treated in order to illustrate our matter. [less ▲]

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See detailMathematical modelling and design of an advanced once-through heat recovery steam generator
Dumont, Marie-Noëlle ULg; Heyen, Georges ULg

in Computers & Chemical Engineering (2004), 28(5), 651-660

The once-through heat recovery steam generator (HRSG) design is ideally matched to very high temperature and pressure, well into the supercritical range. Moreover this type of boiler is structurally ... [more ▼]

The once-through heat recovery steam generator (HRSG) design is ideally matched to very high temperature and pressure, well into the supercritical range. Moreover this type of boiler is structurally simpler than a conventional one, since no drum is required. In a conventional design, each tube plays a well-defined role: water preheating, vaporisation, superheating. Empirical equations are available to predict the average beat transfer coefficient for each region. For once-through applications, this is no more the case and mathematical models have to be adapted to account for the disappearance of the conventional economiser, boiler and superheater. General equations have to be used for each tube of the boiler, and the actual heat transfer condition in each tube has to be identified. The mathematical complexity as well as the number of equations is increased. A thermodynamic model has been selected and implemented to suit very high pressure (up to 240 bar), sub- and supercritical steam properties. Model use is illustrated by two case studies: a 180 bar once-through boiler (OTB) and a conventional boiler superheater and reheater. (C) 2004 Elsevier Ltd. All rights reserved. [less ▲]

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See detailMathematical modelling and design of an advanced once-through heat recovery steam generator
Dumont, Marie-Noëlle ULg; Heyen, Georges ULg

in Computer Aided Chemical Engineering (2003), 14

The once-through heat recovery steam generator design is ideally matched to very high temperature and pressure, well into the supercritical range. Moreover this type of previous termboilernext term is ... [more ▼]

The once-through heat recovery steam generator design is ideally matched to very high temperature and pressure, well into the supercritical range. Moreover this type of previous termboilernext term is structurally simpler than a conventional one, since no drum is required. A specific mathematical model has been developed. Thermodynamic model has been implemented to suit very high pressure (up to 240 bar), sub- and supercritical steam properties. We illustrate the model use with a 180 bar once-through previous termboilernext term (OTB). [less ▲]

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See detailComputer-Aided Design of Redundant Sensor Networks
Heyen, Georges ULg; Dumont, Marie-Noëlle ULg; Kalitventzeff, Boris ULg

Poster (2002, May)

A systematic method to design sensor networks able to identify key process parameters with a required precision at a minimal cost is presented. The procedure is based on a linearised model, derived ... [more ▼]

A systematic method to design sensor networks able to identify key process parameters with a required precision at a minimal cost is presented. The procedure is based on a linearised model, derived automatically from a rigorous non-linear data reconciliation model. A genetic algorithm is used to select the sensor types and locations. [less ▲]

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See detailMathematical modelling of an advanced once-through sub- or supercritical heat recovery steam generator
Dumont, Marie-Noëlle ULg

Poster (2001, October)

The design and the follow-up of a once-through circulation boiler differs from the design and the follow-up of a conventional boiler. A specific thermodynamic model has to suit very high pressure, sub ... [more ▼]

The design and the follow-up of a once-through circulation boiler differs from the design and the follow-up of a conventional boiler. A specific thermodynamic model has to suit very high pressure, sub- and supercritical steam properties. Mathematical models have to be adapted to account for the disappearance of the conventional economiser, boiler and superheater. Empirical equations corresponding to each part of the traditional boiler are no more possible. In a once-through heat recovery boiler the location of the boiling point is no more fixed. General equations have to be used for each tube of the boiler. The mathematical complexity as well as the number of equations is increased. This paper presents one subcritical 180 bar once-through heat recovery boiler model. Comparison with usual boilers in terms of mathematical results are presented, including the description of a specific mathematical model, especially developed, using the Belsim-VALI software, to represent a once-through boiler. [less ▲]

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See detailProduction of sulfuric acid and installation therefor
Arpentinier, Philippe; Dumont, Marie-Noëlle ULg; Kalitventzeff, Boris ULg

Patent (2000)

In the production of sulfuric acid by (a) oxidizing a sulfurous material with an oxidant to obtain sulfur dioxide, (b) catalytically oxidizing this with oxygen to obtain sulfur trioxide and (c) producing ... [more ▼]

In the production of sulfuric acid by (a) oxidizing a sulfurous material with an oxidant to obtain sulfur dioxide, (b) catalytically oxidizing this with oxygen to obtain sulfur trioxide and (c) producing sulfuric acid and a waste gas, at least part of the waste gas is recycled to the first step. The fabrication of sulfuric acid consists of: (a) producing sulfur dioxide from a sulfur based material and an oxidant; (b) converting catalytically the sulfur dioxide into trioxide in a catalytic converter fed with oxygen; and (c) producing sulfuric acid from the sulfur trioxide. In the last step, some other gases are also produced which are (partially) recycled into the oxidant used in step (a). An Independent claim is also included for apparatus for performing the process. The apparatus for H2SO4 production consists of: (a) production unit (10') of SO2 from a sulfurous raw material and an oxidant; (b) catalytic converter (20') of SO2 equipped with means of feeding O2; and (c) preparation unit (30') of H2SO4 from SO3 It comprises also means for recycling waste gases at the outlet of the preparation unit (30') of H2SO4 towards the SO2 production unit (10'). [less ▲]

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See detailProcess Integration Techniques in the Development of New Energy Technologies : Application to the Isothermal Gas Turbine
Dumont, Marie-Noëlle ULg; Marechal, Francois; Kalitventzeff, Boris ULg

(1998, August)

Cogeneration is one of the key technologies for CO2 reduction in the process industry. A good integration of the cogeneration system and the process is necessary to obtain the maximum energy saving. This ... [more ▼]

Cogeneration is one of the key technologies for CO2 reduction in the process industry. A good integration of the cogeneration system and the process is necessary to obtain the maximum energy saving. This requires the possibility of adapting the design parameters of the cogeneration system to better suit the process requirements. The isothermal gas turbine is a new concept combining partial oxidation and staged combustion inside a gas turbine to reach electrical efficiencies as high as 58%. The use of steam in the catalytic burner allows to expand steam directly in the gas turbine in such a way that the mechanical power production is increased. The flue gases composition and temperature are therefore modified. New flow sheets for combined cycles will be presented as well as their adaptation to different steam to carbon ratios. When using isothermal gas turbine as a cogeneration system, the steam flowrate allows adapting the flue gases of the turbine in order to match at best the process requirements. The conceptual design of the isothermal gas turbine integration has been performed using the « Effect Modeling and Optimization » concept that is based on process integration techniques. This serves as a first step to identify the major flow rates to be considered for the technology. The final configuration of the integrated technology has been evaluated afterwards using process simulation. [less ▲]

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See detailPinch Point Method in Optimization of Advanced Combined Cycles
Maréchal, François; Dumont, Marie-Noëlle ULg

Poster (1997, October 05)

The pinch point method has been developed to identify energy saving opportunities in industrial processes, The use of the composite curves allows to compute the minimum energy requirement of a process and ... [more ▼]

The pinch point method has been developed to identify energy saving opportunities in industrial processes, The use of the composite curves allows to compute the minimum energy requirement of a process and to determine optimal heat exchange between hot urd cold streams. The use of MILP (Mixed Integer Linear Programming) optimisation method allows to extend the approach to solve combined heat and power problems. The method is applied here to determine the optimal configuration of combined cycles, It allows to maximize the mechanical power production without having to consider the heat exchangersc onfiguration in the boiler nor in the preheating section. The method is also used to compute the steam extractions or productions and their optimal pressure levels that maximize the mechanical power produced From these results, the heat exchangers network structure is then determined. Three situations are analyzed: l) the heat recovery in a classical boiler using air preheating, 2) the gas turbine combined cycle and. 3) the " isothermal" gas turbine. The " isothermal" gas turbine is an innovative promising technology that uses a partial oxydation reactor followed by a staged combustion between the expansion stages to reach a quasi isothermal profile during the expansion. This allows to reduce the exergy losses in the gas turbine. The resulting flue gases are used in a combined cycle optimized with the method presented here. Diffirent configurations are discussed We show that the structure of combined cycles may strongly differ from one to another. [less ▲]

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See detailCase study concerning the opportunity of installing cogeneration system in an existing industrial site
Dumont, Marie-Noëlle ULg

in Proceedings ECCE-1, Volume 3 (1997, May 04)

The combined production of heat and power using cogeneration systems is one of the investigated area to reduce the global CO2 production of the industrial activities in Europe. Due to the time scale of ... [more ▼]

The combined production of heat and power using cogeneration systems is one of the investigated area to reduce the global CO2 production of the industrial activities in Europe. Due to the time scale of the investment, the appropriate sizing of a cogeneration unit is critical for defining the financial feasibility of the project. The possible efforts that could be made during this time scale for improving the enorgy efficiency of the process can make the cogeneration system oversized or even useless. In this paper, we present two methods that we applied to compute the appropriate size of a cogeneration system to be integrated to an industrial site. The first is directly based ôn the present steam consumption figures. This approach is easier and simpler but the solution is not sure for the future, it leads to a 5.6 MW gas turbine but without reducing the overall energy requirements of the plant. The second is based on energy integration including the optimal use of the steam network for CHP. This approach has the advantage to provide a reliable solution for the future. Using this approach, we have computed an energy savings potential of 60Vo, the energy requirements being satisfied by a 4.6 MW gas turbine, and the possibility of producing a complementary 3 MW with steam turbines. [less ▲]

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