Design of SRU Thermal Reactor and Waste Heat Boiler Considering Recombination Reactions

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Studying oven technology towards the energy consumption optimisation for the baking process

A recent guideline from the European Commission declared that several highly energy consuming domestic equipment should be better regulated or avoided at all in the near future. Together with this, several EU nations are abandoning the gas ovens in favour of the electric ones, also due to the home energy rating regulations, that make impossible to get the highest rating with gas ovens. Due to this fact, the study of the technologies related to the energy efficiency in cooking is increasingly developing. The combination of several energy sources (e.g. forced convection, irradiation, microwave, etc.), as well as optimisation of each of them, is an emerging target for oven manufacturers, in matter of oven design and better use of the oven capabilities. Within this context, an energy consumption analysis and optimisation is targeted in this work, by the application of a bread baking model, validated on experimental data. Each source of energy is given the due importance and the practically applicable process solutions are compared. A basic quality standard is guaranteed by taking into account some quality markers, which are relevant on the basis of a consumer point of view. This work is a part of a more comprehensive study on oven cooking and energy integration, and could lead to practical applications in the design of energy efficient cooking programs

Sexto reporte de eventos adversos con tratamientos biológicos en Argentina. Informe del registro BIOBADASAR

Objetivo: actualizar los resultados del registro BIOBADASAR sobre seguridad, duración y causas de interrupción del tratamiento luego de 8 años de seguimiento. Métodos: BIOBADASAR es un registro de seguridad de terapias biológicas establecido por la Sociedad Argentina de Reumatología. Se presenta la descripción de BIOBADASAR 3.0, una cohorte compuesta por 53 centros de Argentina seguidos prospectivamente desde agosto de 2010 hasta enero de 2018

Heat and mass transfer in roast beef cooking : temperature and weight loss prediction

The development of food processes, ingredients and formulations is a daily topic for the food industries. Model-based product, process and equipment design are getting increasing industrial attention, due to the high potential in matter of time and money saving. Bringing these advantages to the consumers\u2019 table by the application of this approach is one of the ultimate challenges of food and bioprocess engineering. This work aims to consider roast beef cooking as a practical, widespread, case study. A computational model, which correlates temperature, time and weight loss for a standard piece of meat cooked in oven, is developed and validated with experiments. The thermal properties are derived with a general approach, applicable to other food. The heat and mass transport equations are based both on conservation laws and on the cooking conditions

Improving Operability And Process Understanding Of Sulfur Recovery Units

Sulfur recovery units are particularly difficult to model since they are usually characterized by poor field instrumentation and the phenomena governing their main units and reactions are very complex and quite cumbersome to be explained by first-principles relationships. Specifically, the thermal reaction furnace is the key-element of these processes but there is still not full understanding on its general behavior and on the interactions of the complex phenomena that take place in it. This paper is aimed at proposing an overall sensitivity analysis of the thermal reaction furnace by means of detailed kinetics schemes (800+ reactions). The results are the essential guidelines to improve the operability and safety of sulfur recovery units. Copyright © 2012, AIDIC Servizi S.r.l.26237242Akyildiz, V., Ozkan, A., Cokaygil, Z., Banar, M., Baydar, S., Improvement of solid product quality in pyrolysis of tyre derived fuels (tdf (2010) Chemical Engineering Transactions, 21, pp. 775-780Binoist, M., Labégorre, B., Monnet, F., Clark, P.D., Dowling, N.I., Huang, M., Archambault, D., Marquaire, P.M., Kinetic study of the pyrolysis of H2S (2003) Ind. Eng. Chem. Res., 42, pp. 3943-3951Bolf, N., Mohler, I., Golob, M., Galinec, G., Ivandic, M., Software sensor for sulphur recovery unit control (2009) Chemical Engineering Transactions, 17, pp. 1191-1196Bonet-Ruiz, J., Bonet-Ruiz, A.E., Llacuna, J.L., Plesu, V., Bercaru, M.T., Bozga, R.E., Patrut, C., Simulation of a continuous process for biodiesel synthesis from triacylglycerol based on different topologies (2010) Chemical Engineering Transactions, 21, pp. 1357-1362Brinkmann, U., Kenig, E., Thiele, R., Haas, M., Modelling and simulation of a packed sulphur dioxide absorption unit using the hydrodynamic analogy approach (2009) Chemical Engineering Transactions, 18, pp. 195-200Clark, P.D., Dowling, N.I., Huang, M., Svrcek, W.Y., Monnery, W.D., Mechanisms of co and cos formation in the claus furnace (2001) Ind. Eng. Chem. 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Design of SRU thermal reactor and waste heat boiler considering recombination reactions

The Claus process is commonly used for recovering sulfur from acid gases coming from oil and gas desulphurization treatment. Typically, a SRU is composed of a burner, a thermal reactor (TR), a waste heat boiler (WHB), and a train of sulfur condensers and catalytic Claus reactors. A model for the design of a TR and a WHB was described and was applied to two operating systems. For the first, inlet acid gas and combustion air compositions were given, and the TR-WHB system was modeled as a single plug flow reactor. For the second system, the model was applied to the WHB only, for a given combusted gas composition at the inlet of tubes. For system 1, the gas temperature was at uniform temperature in the TR and composition was about at equilibrium at the inlet of tubes. Recombination occurred and significant amount of H2S was formed. SO2 and CO2 were formed and consumed, respectively. This is an abstract of a paper presented at the CHISA 2012 - 20th International Congress of Chemical and Process Engineering and PRES 2012 - 15th Conference PRES (Prague, Czech Republic 8/25-29/2012)

Assessment Of Direct Thermal Energy Storage Technologies For Concentrating Solar Power Plants

Dynamic simulation, design improvements and control issues in solar power plants might compete with special considerations on storing techniques along with optimal store technically and from economic point of view. In order to provide the stability in production of power in spite of inconsistency in the source of energy, i.e., sun, overall concerns in the details of solar power plant, competition and comparison of common storing technologies should be taken into account in designation of the plant and plantwide control based on the performance of the storage in charging and discharging periods for the delivery and produce the electricity steadily. This research activity is mainly focused on the simulation of solar power plant for direct thermal energy storage technologies (double-tank and single-tank storage technologies) with DYNSIM™ suite to simulate dynamics and control the entire of plant and FLUENT™ for computational fluid-dynamics studies of thermocline effects in single-tank storage. Assessment of effectiveness, controllability, and flexibility of different direct technologies are brought together with the development of ad hoc control strategies to manage optimally. Copyright © 2013, AIDIC Servizi S.r.l.35547552Cabeza, L.F., Sloe, C., Castell, A., Oro, E., Gil, A., Review of solar thermal storage techniques and associated heat transfer technologies (2012) Proceeding of IEEE, 100, pp. 525-538Čuček, L., Lam, H.L., Klemeš, J.J., Varbanov, P.S., Kravanja, Z., Synthesis of regional networks for the supply of energy and bioproducts (2010) Clean Technologies and Environmental Policy, 12 (6), pp. 635-645Flueckiger, S., Yang, Z., Garimella, S.V., (2011) An Integrated Thermal and Mechanical Investigation of Molten-salt Thermocline Energy Storage, , CTRC Research Publications, paper 150Klemeš, J.J., Varbanov, P.S., Pierucci, S., Huisingh, D., Minimising emissions and energy wastage by improved industrial processes and integration of renewable energy (2010) Journal of Cleaner Production, 18 (9), pp. 843-847Lam, H.L., Varbanov, P., Klemeš, J., Minimising carbon footprint of regional biomass supply chains (2010) Resources, Conservation and Recycling, 54 (5), pp. 303-309Lam, H.L., Varbanov, P.S., Klemeš, J.J., Optimisation of regional energy supply chains utilising renewables: P-graph approach (2010) Computers and Chemical Engineering, 34 (5), pp. 782-792Lam, H.L., Varbanov, P.S., Klemeš, J.J., Regional renewable energy and resource planning (2011) Applied Energy, 88 (2), pp. 545-550Li, P., Van Lew, J., Chan, C., Karaki, W., Stephens, J., O'Brien, J.E., Similarity and generalized analysis of efficiencies of thermal energy storage (2012) Renewable Energy, 39, pp. 388-402Li, P., Lew, J.V., Karaki, W., Chan, C., Stephens, J., Wang, Q., Generalized chart of energy storage effectiveness for thermocline heat storage tank design and calibration (2011) Solar Energy., 85, pp. 2130-2143Manenti, F., Ravaghi-Ardebili, Z., Dynamic simulation of concentrating solar power plant and two-tank direct thermal energy storage (2013) Energy, , to appear, DOI: 10.1016/j.Energy.2013.02.001Oro, E., Gil, A., Gracia, A., Boer, D., Cabeza, L.F., Comparative life cycle assessment of thermal energy storage systems for solar power plants (2012) Renewable Energy, 44, pp. 166-173Ozalp, N., Epstein, M., Kogan, A., An overview of solar thermochemical hydrogen, carbon nano-materials and metals production technologies (2009) Chemical Engineering Transactions, 18, pp. 965-970Pacheco, J., Showalter, S., Kolb, W., Development of a molten salt thermocline thermal storage system for parabolic trough plants (2002) Solar Energy Engineering, 124, pp. 153-159Piemonte, V., De Falco, M., Giaconia, A., Tarquini, P., Iaquaniello, G., Life cycle assessment of a concentrated solar power plant for the production of enriched methane by steam reforming process (2010) Chemical Engineering Transactions, 21, pp. 25-30Sikos, L., Klemeš, J., Reliability, availability and maintenance optimisation of heat exchanger networks (2010) Applied Thermal Engineering, 30 (1), pp. 63-69Vitte, P., Manenti, F., Pierucci, S., Joulia, X., Buzzi-Ferraris, G., Dynamic simulation of concentrating solar plants (2012) Chemical Engineering Transactions, 29, pp. 235-240Yang, Z., Garimella, S.V., Thermal analysis of solar thermal energy storage in a molten-salt thermocline (2010) Solar Energy, 84, pp. 974-989Zhu, X.X., Zanfir, M., Klemeš, J., Heat transfer enhancement for heat exchanger network retrofit (2000) Heat Transfer Engineering, 21 (2), pp. 7-1