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Mahmoud M Elhalwagi - One of the best experts on this subject based on the ideXlab platform.

  • an integrated approach for incorporating thermal membrane distillation in treating water in heavy oil recovery using sagd
    Journal of Unconventional Oil and Gas Resources, 2015
    Co-Authors: Nesreen A Elsayed, Mahmoud M Elhalwagi, Maria A Barrufet
    Abstract:

    Abstract The production of heavy oil and bitumen requires unconventional methods. One such approach is steam-assisted gravity drainage (SAGD). This technology has key advantages but is characterized with substantial levels of water consumption and discharge. Therefore, there is a need for effective water treatment and reuse methods in SAGD. This paper examines the use of an emerging technology: thermal membrane distillation (TMD) as an integral part of water treatment for SAGD. Synergistic effects are exploited from heat and Mass Integration of SAGD and TMD. Specifically, the hot produced water and blowdown water are evaluated for treatment using TMD because of their thermal content and because of the need for high levels of purity which can be achieved by TMD. Several design configurations and scenarios are proposed and evaluated to assess the technical and economic viability of including TMD as a process in water-management systems for SAGD.

  • an integrated approach to the simultaneous design and operation of industrial facilities for abnormal situation management
    Computer-aided chemical engineering, 2014
    Co-Authors: Fadwa T Eljack, Mahmoud M Elhalwagi
    Abstract:

    Abstract Flaring is a common operation in industrial facilities and is usually intended for safety purposes, for disposal of waste gases with low heating values, or for management of abnormal situations. In addition to the economic losses associated with ineffective combustion of off-spec hydrocarbon products, flaring contributes significantly to the emission of greenhouses gases and primary and secondary pollutants. These are critically important economic and environmental issues to the State of Qatar. Traditionally, abnormal situation management has been addressed through responsive operational strategies. In this work, we propose a novel approach to the optimal management of abnormal situation that occur in facilities, based on simultaneous design and operation. First, the process is described as an integrated system with models that relate the various design and operating variables. The result is a Mass-Integration framework, which quantifies the causes and consequences of plant upsets resulting in flaring as they pertain to the key objectives of the process, such as productivity, environmental sustainability, safety. Based on this holistic understanding of the process, optimal design modifications and operating strategies are derived for plausible scenarios and deviations. As such, flaring resulting from abnormal situations is reconciled with the various process objectives and is proactively contextualized as part of the design and operation of the process. Once base-case scenarios and designs are developed, dynamic simulation models are developed to track process operation and to determine optimal operational strategies. Additionally, energy Integration alternatives (e.g., process cogeneration) will be considered for the effective utilization of heat associated with flaring.

  • targeting cogeneration and waste utilization through process Integration
    Applied Energy, 2009
    Co-Authors: Mahmoud M Elhalwagi, D Harell, Dennis H Spriggs
    Abstract:

    In this paper we focus on energy flows and specifically on the complex interactions between heat and power generation and use in steam systems along with combustible wastes of the process. Our objective is to present a systematic methodology for the quick targeting of power cogeneration potential in steam systems ahead of designing the power generation network. The devised approach makes effective utilization of combustible wastes and reconciles the use and dispatch of process fuel sources, heating and non-heating uses of steam, and power generation. The new concept of extractable energy is introduced to facilitate a simple calculation of cogeneration potential in the process. Balances around steam headers are used to identify surpluses and deficits. Next, surplus and deficit composite curves are constructed to identify feasible transfers of extractable energy. The result is the identification of the cogeneration target and excess steam that can be used in condensing turbines. This methodology takes a holistic view of the process and can easily be combined with other Mass and energy Integration techniques. It specifically accommodates both (a) production objectives (Mass Integration) and (b) heat recovery network targeting and utility selection (energy Integration). An example problem is presented to illustrate the methodology.

  • optimum Mass Integration strategies for condensation and allocation of multicomponent vocs
    Chemical Engineering Science, 2000
    Co-Authors: Gautham Parthasarathy, Mahmoud M Elhalwagi
    Abstract:

    Abstract Multicomponent volatile organic compounds (VOCs) are among the most important species employed in the process industry. Their recovery and allocation, therefore, are critical tasks in many facilities. A key VOC recovery technology is condensation. This paper introduces a systematic procedure for the optimal design of condensation, mixing and routing of multicomponent VOCs. Mass Integration strategies are employed as a holistic framework for addressing the problem. First, a mixed integer nonlinear program is developed to solve the problem. Because of the non-convexity of the problem coupled with the need to solve an inner minimization problem, a global optimization procedure is developed. This procedure is based on exploiting problem properties gained by insights, active constraint strategies and decomposition techniques. Furthermore, the solution strategy allows the use of non-ideal vapor liquid equilibrium calculations outside the optimization problem thereby significantly simplifying the calculations while still maintaining the rigor of the results. Using these concepts, the seemingly complicated design task is reduced to a far more tractable problem which is solved globally. A case study is presented to demonstrate the broad applicability and potential benefits of the approach along with its global optimization solution strategies.

  • interval based targeting for pollution prevention via Mass Integration
    Computers & Chemical Engineering, 1999
    Co-Authors: Bahy M Noureldin, Mahmoud M Elhalwagi
    Abstract:

    Mass Integration is a holistic approach to the optimal allocation, generation, and separation of streams and species. It addresses pollution using a combination of strategies including manipulation of process equipment, structural changes in the flowsheet, rerouting of streams and addition of new units. In the past, systematic Mass Integration techniques were developed to determine optimal strategies for the recycle and separation of process streams. The purpose of this paper is to introduce two novel contributions that can greatly expand the scope of Mass Integration for pollution prevention. First, maximum achievable pollution targets will be determined ahead of design and with little input data. In this context, we will illustrate the use of interval arithmetic to determine these targets. Second, pollution prevention through unit manipulation will be addressed. The devised interval-based targets posess the attractive feature that they are global regardless of the nonlinearity nature of the process model. These new concepts are illustrated with a case study. © 1999 Elsevier Science Ltd. All rights reserved.

Daramola, Michael O. - One of the best experts on this subject based on the ideXlab platform.

  • A review on heat and Mass Integration techniques for energy and material minimization during CO2 capture
    'Springer Science and Business Media LLC', 2019
    Co-Authors: Yoro, Kelvin O., Sekoai, Patrick T., Isafiade, Adeniyi J., Daramola, Michael O.
    Abstract:

    One major challenge confronting absorptive CO2 capture is its high energy requirement, especially during stripping and sorbent regeneration. To proffer solution to this challenge, heat and Mass Integration which has been identified as a propitious method to minimize energy and material consumption in many industrial applications has been proposed for application during CO2 capture. However, only a few review articles on this important field are available in open literature especially for carbon capture, storage and utilization studies. In this article, a review of recent progress on heat and Mass Integration for energy and material minimization during CO2 capture which brings to light what has been accomplished till date and the future outlook from an industrial point of view is presented. The review elucidates the potential of heat and Mass exchanger networks for energy and resource minimization in CO2 capture tasks. Furthermore, recent developments in research on the use of heat and Mass exchanger networks for energy and material minimization are highlighted. Finally, a critical assessment of the current status of research in this area is presented and future research topics are suggested. Information provided in this review could be beneficial to researchers and stakeholders working in the field of energy exploration and exploitation, environmental engineering and resource utilization processes as well as those doing a process synthesis-inclined researc

  • Energy and Material Minimization During CO2 Capture Using a Combined Heat and Mass Integration Technique
    SINTEF Academic Press, 2019
    Co-Authors: Yoro, Kelvin O., Isafiade, Adeniyi J., Chiwaye Natsayi, Daramola, Michael O.
    Abstract:

    Heat and Mass exchange occur concurrently during CO2 capture. Therefore, the application of a combined heat and Mass exchanger network (CHAMEN) could be a very good option to reduce energy and material consumption simultaneously during CO2 capture. In this study, a systematic technique for the synthesis of combined heat and Mass exchanger networks (CHAMENs) was introduced to concurrently minimize the use of external utilities and Mass separating agents (MSA) during adsorptive CO2 capture. The method proposed in this study is based on an innovative approach that integrates a mathematical programming technique for the heat exchanger networks (HENs) synthesis and a sequentially-based composition interval technique for Mass exchanger networks (MENs) synthesis with regeneration. A combined optimization approach was used to minimize the total annualized cost of the synthesized CHAMEN. An example was solved to test the efficacy of the proposed method. The cost of Mass separating agents, as well as hot and cold utilities which form the total annualized costs (TAC) for the combined heat and Mass exchangers, was minimized. The total annualized cost (TAC) of the synthesized CHAMEN obtained in this study (TAC=$199800/yr) showed significant improvement over the TAC reported in the literature using other synthesis techniques. Results obtained in this study confirmed that the Integration of a combined heat and Mass exchanger with regeneration network is an effective way to minimize heat and Mass during adsorptive CO2 capture. The combined heat and Mass exchanger networks adequately satisfied the heat and Mass balance of the process with a lower total annualized costpublishedVersio

Dennis H Spriggs - One of the best experts on this subject based on the ideXlab platform.

  • targeting cogeneration and waste utilization through process Integration
    Applied Energy, 2009
    Co-Authors: Mahmoud M Elhalwagi, D Harell, Dennis H Spriggs
    Abstract:

    In this paper we focus on energy flows and specifically on the complex interactions between heat and power generation and use in steam systems along with combustible wastes of the process. Our objective is to present a systematic methodology for the quick targeting of power cogeneration potential in steam systems ahead of designing the power generation network. The devised approach makes effective utilization of combustible wastes and reconciles the use and dispatch of process fuel sources, heating and non-heating uses of steam, and power generation. The new concept of extractable energy is introduced to facilitate a simple calculation of cogeneration potential in the process. Balances around steam headers are used to identify surpluses and deficits. Next, surplus and deficit composite curves are constructed to identify feasible transfers of extractable energy. The result is the identification of the cogeneration target and excess steam that can be used in condensing turbines. This methodology takes a holistic view of the process and can easily be combined with other Mass and energy Integration techniques. It specifically accommodates both (a) production objectives (Mass Integration) and (b) heat recovery network targeting and utility selection (energy Integration). An example problem is presented to illustrate the methodology.

Baake Olaf - One of the best experts on this subject based on the ideXlab platform.

  • Regular black holes and gravitational particle-like solutions in generic DHOST theories
    'IOP Publishing', 2021
    Co-Authors: Baake Olaf, Charmousis Christos, Hassaine Mokhtar, San Miguel
    Abstract:

    International audienceWe construct regular, asymptotically flat black holes of higher order scalar tensor (DHOST) theories, which are obtained by making use of a generalized Kerr-Schild solution generating method. The solutions depend on a Mass Integration constant, admit a smooth core of chosen regularity, and generically have an inner and outer event horizon. In particular, below a certain Mass threshold, we find Massive, horizonless, particle-like solutions. We scan through possible observational signatures ranging from weak to strong gravity and study the thermodynamics of our regular solutions, comparing them, when possible, to General Relativity black holes and their thermodynamic laws

  • Regular black holes and gravitational particle-like solutions in generic DHOST theories
    'IOP Publishing', 2021
    Co-Authors: Baake Olaf, Charmousis Christos, Hassaine Mokhtar, Juan, Miguel San
    Abstract:

    We construct regular, asymptotically flat black holes of higher order scalar tensor (DHOST) theories, which are obtained by making use of a generalized Kerr-Schild solution generating method. The solutions depend on a Mass Integration constant, admit a smooth core of chosen regularity, and generically have an inner and outer event horizon. In particular, below a certain Mass threshold, we find Massive, horizonless, particle-like solutions. We scan through possible observational signatures ranging from weak to strong gravity and study the thermodynamics of our regular solutions, comparing them, when possible, to General Relativity black holes and their thermodynamic laws.Comment: 20 pages, 5 figures (added new references

Bahy M Noureldin - One of the best experts on this subject based on the ideXlab platform.

  • interval based targeting for pollution prevention via Mass Integration
    Computers & Chemical Engineering, 1999
    Co-Authors: Bahy M Noureldin, Mahmoud M Elhalwagi
    Abstract:

    Mass Integration is a holistic approach to the optimal allocation, generation, and separation of streams and species. It addresses pollution using a combination of strategies including manipulation of process equipment, structural changes in the flowsheet, rerouting of streams and addition of new units. In the past, systematic Mass Integration techniques were developed to determine optimal strategies for the recycle and separation of process streams. The purpose of this paper is to introduce two novel contributions that can greatly expand the scope of Mass Integration for pollution prevention. First, maximum achievable pollution targets will be determined ahead of design and with little input data. In this context, we will illustrate the use of interval arithmetic to determine these targets. Second, pollution prevention through unit manipulation will be addressed. The devised interval-based targets posess the attractive feature that they are global regardless of the nonlinearity nature of the process model. These new concepts are illustrated with a case study. © 1999 Elsevier Science Ltd. All rights reserved.