References of "Kalitventzeff, Boris"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailProcess monitoring using a combination of data driven techniques and model based data validation
Duchesne, Arnaud; Heyen, Georges ULg; Mack, Philippe et al

in Revista de Chimie (2007), 58(4), 423-426

Process monitoring is made difficult when measurements are subjected to errors, since pertinent information is hidden in the measurement noise. To address this issue, one can use model based data ... [more ▼]

Process monitoring is made difficult when measurements are subjected to errors, since pertinent information is hidden in the measurement noise. To address this issue, one can use model based data validation, or rely on statistical techniques to analyze large historical data sets (data mining). An industrial case study is presented here, where a model based approach (data validation) is compared to data driven techniques. [less ▲]

Detailed reference viewed: 65 (7 ULg)
Full Text
Peer Reviewed
See detailHow CAPE tools can contribute to process sustainability
Kalitventzeff, Boris ULg; Heyen, Georges ULg; Closon, Hervé et al

in Journal of Cleaner Production (2004), 12(2), 117-124

The concern of the EFCE for sustainability. Four recent case studies to illustrate how CAPE tools contribute to process sustainability: (1) ultimate plant operation at Wacker-Chemie (DE), (2) development ... [more ▼]

The concern of the EFCE for sustainability. Four recent case studies to illustrate how CAPE tools contribute to process sustainability: (1) ultimate plant operation at Wacker-Chemie (DE), (2) development of a new sulphuric acid plant with Air Liquide (FR), (3) plant retrofit for CO2 abatement at Kemira (BE), (4) insertion of a new plant in an existing Solvay industrial site (Asia). (C) 2003 Published by Elsevier Ltd. [less ▲]

Detailed reference viewed: 129 (10 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 22 (7 ULg)
Full Text
Peer Reviewed
See detailPlant monitoring and fault detection - Synergy between data reconciliation and principal component analysis
Amand, Thierry; Heyen, Georges ULg; Kalitventzeff, Boris ULg

in Computers & Chemical Engineering (2001), 25(4-6), 501-507

Data reconciliation and principal component analysis are tno recognised statistical methods used for plant monitoring and fault detection. We propose to combine them for increased efficiency. Data ... [more ▼]

Data reconciliation and principal component analysis are tno recognised statistical methods used for plant monitoring and fault detection. We propose to combine them for increased efficiency. Data reconciliation is used in the first step of the determination of the projection matrix for principal component analysis (eigenvectors). principal component analysis can then be applied to raw process data for monitoring purpose. The combined use of these techniques aims at a better efficiency in fault detection. It relies mainly in a lower number of components to monitor. The method is applied to a modelled ammonia synthesis loop. (C) 2001 Elsevier Science Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 20 (3 ULg)
Full Text
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 ▲]

Detailed reference viewed: 52 (21 ULg)
Full Text
Peer Reviewed
See detailModelling the butterfat crystallisation process
Heyen, Georges ULg; Alleman, Xavier; Kalitventzeff, Boris ULg et al

in Computers & Chemical Engineering (1999), 23(Suppl. S), 819-822

Milk fat exhibits seasonal variations in composition and properties which are undesirable for many subsequent applications. Thus techniques are sought to process dairy products in order to achieve a ... [more ▼]

Milk fat exhibits seasonal variations in composition and properties which are undesirable for many subsequent applications. Thus techniques are sought to process dairy products in order to achieve a consistent quality. A brief introduction to milk fat presents its most important particularities, especially composition, seasonal variations, solid fat content, crystalisation and polymorphism. The differential scanning calorimetry (DSC) analysis allows to estimate the solid fat content. Different methods have been developed to estimate more and more precisely the solid fat content which is certainly an important parameter in the description of the textural properties of butterfat. The industrial crystallisation process is modelled on the basis of pilot plant data. That model allows to approach the particular temperature profile in the scraped surface heat exchangers and to give a first explanation of the involved phenomena. [less ▲]

Detailed reference viewed: 18 (3 ULg)
Full Text
Peer Reviewed
See detailA comparison of advanced thermal cycles suitable for upgrading existing power plant
Heyen, Georges ULg; Kalitventzeff, Boris ULg

in Applied Thermal Engineering (1999), 19(3), 227-237

In view of the constant growth of electricity usage and public pressure to reduce the dependence on nuclear power plants in the energy supply, solutions are sought to increase the capacity of power plants ... [more ▼]

In view of the constant growth of electricity usage and public pressure to reduce the dependence on nuclear power plants in the energy supply, solutions are sought to increase the capacity of power plants using fossil fuels. Highly efficient cycles are available : gas turbines combined with waste heat boilers and steam cycles are able to achieve efficiencies above 50-55%. However building new plants requires a large amount of capital. Alternative proposals are based on upgrades of existing plants : capital savings are expected by reusing part of the facilities. In the present study, three parallel proposals are compared on the basis of exergy efficiency; cost of investment and flexibility of operation are also discussed. They are compared with classical Rankine cycle and state of the art combined cycles. (C) 1998 Elsevier Science Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 26 (5 ULg)
Full Text
Peer Reviewed
See detailSpreadsheet based teaching aids in chemical engineering education
Heyen, Georges ULg; Kalitventzeff, Boris ULg

in Computers & Chemical Engineering (1999), 23(Suppl. S), 629-632

Modern spreadsheet programs offer a wide range of calculation, charting and dialog options, allowing the development of effective teaching aids. Examples of worksheet illustrating numerical analysis ... [more ▼]

Modern spreadsheet programs offer a wide range of calculation, charting and dialog options, allowing the development of effective teaching aids. Examples of worksheet illustrating numerical analysis, thermodynamics and unit operations are shown. All offer complete interaction between the problem statement and the presentation of results. [less ▲]

Detailed reference viewed: 37 (3 ULg)
Full Text
Peer Reviewed
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 ▲]

Detailed reference viewed: 18 (9 ULg)
Full Text
Peer Reviewed
See detailApplication of CAPE techniques to the revamping of existing electrical power plants: an example of interdisciplinary collaboration.
Heyen, Georges ULg; Vrielynck, B.; Kalitventzeff, Boris ULg

in Computers & Chemical Engineering (1998), 22(Suppl. S), 239-246

Coupling of a partial oxidation reactor with a gas turbine. is proposed to increase the capacity and efficiency of thermal power plants. The exhaust of the partial oxidation gas turbine:is a preheated ... [more ▼]

Coupling of a partial oxidation reactor with a gas turbine. is proposed to increase the capacity and efficiency of thermal power plants. The exhaust of the partial oxidation gas turbine:is a preheated fuel that can be burned with little modification in the existing steam generator. The feasibility study requires the development of a reliable model for an existing 250 MW power plant. Data reconciliation is found valuable for obtaining precise mass and energy balances and for screening out unreliable measurements. The identification of model parameters from reconciled values is then straightforward. The same validation Software is later applied to rating simulation of the modified plant, by merging the partial oxidation gas turbine in the model. (C) 1998 Elsevier Science Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 22 (4 ULg)
Full Text
Peer Reviewed
See detailA comparison of advanced thermal cycles suitable for upgrading existing power plants
Heyen, Georges ULg; Kalitventzeff, Boris ULg

in Applied Thermal Engineering (1998), 19

Detailed reference viewed: 7 (3 ULg)
Peer Reviewed
See detailMethodology for optimization of operation to reduce site-scale energy use in production plants
Heyen, Georges ULg; Kalitventzeff, Boris ULg

in Applied Thermal Engineering (1997), 17(8-10), 1005-1014

A methodology was developed to improve energy usage in the process industries by optimizing plant operation. The first step was to build fine tuned site-scale models of energy intensive production plants ... [more ▼]

A methodology was developed to improve energy usage in the process industries by optimizing plant operation. The first step was to build fine tuned site-scale models of energy intensive production plants and of combined heat and power utility distribution networks (heat, power, cooling), and later to optimize them using various numerical techniques. The methodology not only comprises these models, but also the selected optimization methods, their implementation in algorithms suited for the problems to be solved and the evaluation of the results in terms of their applicability ia real industrial problems. The detailed models were tuned on the basis of actual plant data. They were used to calculate accurate energy balances, and thus to identify sources of energy waste. Finally they allowed optimization of energy usage by adjusting operating conditions at a medium time scale (a few hours to a couple of days). Energy savings in the range 5%-10% could be obtained for energy intensive processes, where even a low percentage represents a considerable amount. (C) European Communities 1997. Published by Elsevier Science Ltd. [less ▲]

Detailed reference viewed: 20 (2 ULg)
Full Text
Peer Reviewed
See detailEnergy savings in methanol synthesis: Use of heat integration techniques and simulation tools.
Maréchal, François; Heyen, Georges ULg; Kalitventzeff, Boris ULg

in Computers & Chemical Engineering (1997), 21(Suppl. S), 511-516

Starting with a classical process for producing methanol using the reforming and synthesis steps, a combined approach applying simulation models and a new synthesis strategy, named Effect Modelling and ... [more ▼]

Starting with a classical process for producing methanol using the reforming and synthesis steps, a combined approach applying simulation models and a new synthesis strategy, named Effect Modelling and Optimisation (EMO), has been used to optimise the energy efficiency of the process. The method allows to identify different ways of improving the energy efficiency of the process. The modifications concern the synthesis reactor and the reforming reactor designs, the exploitation of the purge stream as fuel gas to satisfy the process requirement and its integration to a gas turbine system. The EMO approach allows to target the impact of a process modification at the global level of the energy cost of the process, including the combined production of heat and mechanical power in a gas turbine and the steam network. Starting with a classical methane conversion of 60% for the classical system, we identify solutions with up to 93% of the overall methane conversion when we transform the net mechanical power produced into methane savings at the country level. The interest of the approach is the possibility of computing the impact of the process modifications suggested by the analysis of the shape of the heat cascade on the overall energy balance of the plant without having to simulate in many details the steam and the heat exchanger network. [less ▲]

Detailed reference viewed: 21 (3 ULg)
Full Text
Peer Reviewed
See detailSensitivity calculations and variance analysis in plant measurement reconciliation
Heyen, Georges ULg; Marechal, Eric; Kalitventzeff, Boris ULg

in Computers & Chemical Engineering (1996), 20(Suppl. A), 539-544

Analysis of the results of a data reconciliation program is made easier by extracting more information from the Jacobian matrix of the constraint equations. Standard deviation for all state variables ... [more ▼]

Analysis of the results of a data reconciliation program is made easier by extracting more information from the Jacobian matrix of the constraint equations. Standard deviation for all state variables (measured or not measured) is related to the standard deviation of measurements. Distinction between variables that are actually corrected by the validation process, and those that are merely derived from a single measurement is straightforward. Based on this information, decisions can be taken : deletion of unnecessary measurements, addition of new measurement points and their optimal selection, or identification of key measurements for which any enhancement of accuracy would result in significant improvement in the quality of the process validation. [less ▲]

Detailed reference viewed: 29 (5 ULg)
Peer Reviewed
See detailSIMULATION OF FAST TRANSIENTS IN FLUID TRANSPORT EQUIPMENTS AND UTILITY NETWORKS
Heyen, Georges ULg; Kalitventzeff, Boris ULg; HUTCHINSON, Philip et al

in Computers & Chemical Engineering (1992), 16(Suppl. S), 109-117

A model allowing dynamic simulation of processes involving compression, expansion, heat generation and transfer in fluids is presented. Equations are developed for some equipment models, based on one ... [more ▼]

A model allowing dynamic simulation of processes involving compression, expansion, heat generation and transfer in fluids is presented. Equations are developed for some equipment models, based on one-dimensional flow approximation. The architecture of a simulation package based on the object paradigm is described. The programme has been validated with experimental data : surge onset in compression systems has been satisfactorily predicted. [less ▲]

Detailed reference viewed: 11 (0 ULg)