Gbemi Oluleye

Evaluating the potential of a process site for waste heat recovery

Full text via FindIt@Manchester(opens in a new window)|Full-text(opens in a new window)| Export | Download | More... Chemical Engineering TransactionsVolume 39, Issue Special Issue, 2014, Pages 1069-107417th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014; Prague; Czech Republic; 23 August 2014 through 27 August 2014; Code 114752Evaluating the potential of a process site for waste heat recovery (Article)Oluleye, G. , Jobson, M., Smith, R., Perry, S.J. Centre for Process Integration, School of Chemical Engineering and Analytical Science, University of Manchester, Manchester, United KingdomView references (12)AbstractIn this work, waste heat is defined and a methodology is developed to identify the potential for waste heat recovery in a process site, considering the temperature and quantity of waste heat sources from the site processes and the site utility system (including fired heaters and, the cogeneration, cooling and refrigeration systems). To support the methodology, the concept of the energy efficiency of a site is introduced - the fraction of the energy inputs that is converted into useful energy (heat or power or cooling). Mathematical models of waste heat recovery technologies using heat as primary energy source, such as organic Rankine cycles (using both pure and mixed organics as working fluids), absorption chillers and absorption heat pumps are provided and applied to assess the potential for recovery of waste heat. The methodology is illustrated using a case study of a petroleum refinery. The energy efficiency of the site increases by 12 % as a result of the energy recovered from waste heat..

An optimization method to estimate the SOFC market in waste water treatment

Abstract Wastewater treatment plants (WWTP) are one of the most energy intensive public utilities. The valorization of the biogas produced from the sludge in combined heat and power (CHP) systems allows important energy and emissions reduction, particularly if highly efficient engines, like solid-oxide fuel cells (SOFCs) are used. This paper proposes a two-stage stochastic optimization approach to assess the market potential for SOFCs in WWTPs in Europe. Despite the biogas availability is a challenge to guarantee continuity of operation, the results show that the WWTP is a promising market to pave the way for SOFC cost reduction and further technological learning.

Techno-economic assessment of the effects of biogas rate fluctuations on industrial applications of solid-oxide fuel cells

Abstract Wastewater treatment is an energy and greenhouse gas intensive process. An important opportunity to reduce both of these quantities is via the use of biogas in co-generation systems. Solid-oxide fuel cells (SOFCs) are the generator types studied in this work. The feasibility of the retrofitting of a wastewater treatment facility fitted with a SOFC combined heat and power energy provision system is assessed including effects of uncertainties in biogas availability on cost and energy performance. A two-stage stochastic optimization framework is proposed to provide feedback on the co-generation system design. Results quantify standard deviations in the biogas rate beyond which the SOFC capacity factor might drop below 80% and change the optimal size of the modules to install.