Search

El grano de cebada es una importante fuente de β-glucanos, el cual es un polisacárido que forma parte de la fibra dietética (FD) soluble. La fibra soluble tiene mejores propiedades de hidratación, al igual que la fermentación y la producción de ácidos grasos de cadena corta (AGCC). Los β-glucanos proporcionan numerosos beneficios a la salud humana. La presente revisión tiene como objetivo analizar la evidencia actual e informar sobre las modificaciones que sufre durante el consumo, su adición y propiedades funcionales de los β-glucanos de cebada, permitiendo obtener los beneficios a la salud (hipolipidémico, hipoglucémico e hipocolesterolémico). De acuerdo con la revisión, se ha encontrado que contribuyen a disminuir el colesterol total y el cLDL, a prevenir la grasa visceral y el riesgo de enfermedad diverticular, así mismo provocan retraso en el vaciamiento gástrico y atenuación de la velocidad de absorción de la glucosa en el intestino delgado. Además, pueden colaborar a aliviar lesiones gástricas y participar en la actividad anticancerosa y el carcinoma de pulmón; también, su aplicación tópica mejora la cicatrización de úlceras diabéticas y venosas. La evidencia de los estudios recientes demuestra consistentemente que el consumo de β-glucanos se asocia con múltiples beneficios, desde la disminución de la absorción de macronutrientes, hasta la cicatrización de heridas. Esto destaca aún más la importancia de su consumo y utilización.

The article presents a 2-D steady state mathematical model developed to simulate woody biomass combustion in moving grate furnaces. The model simulates: moisture evaporation, devolatilization of volatile matter and char formation, heterogeneous reactions of char, mass and heat transfer between solid and gas phase and bed shrinkage. The model gives as results the contour of the mass concentration of moisture, char and ash along the grate. Furthermore, mass concentration, temperature and velocity field of gas phase above the biomass bed are calculated and structured to be used in a multidimensional CFD model of gas phase combustion. The model provides a significant insight into the various phenomena that occur during biomass thermal conversion and their correlation between the operational condition and biomass characteristics. Thus, the present model can be used as instrument for furnaces design and for the optimization of the existing ones., Proceedings of the 21st European Biomass Conference and Exhibition, 3-7 June 2013, Copenhagen, Denmark, pp. 1118-1124

Moving grate furnaces have large diffusion as CHP plants due to economical feasibility and the ability to process low grade biomass fuels. Unfortunately, packed beds combustion is an high complexity combustion phenomenon and as result these plants are strongly affected by regulation issues which almost inhibit to successfully transfer results from numerical studies. However there is considerable margin to improve performances on pollutant emissions and efficiency by utilizing advanced regulation strategies. The most advanced control strategies adopt a model- based approach to deal with intrinsic high non linearity and complexity of the physics on packed bed combustion. In this paper data obtained from several experimental campaigns have been evaluated on the purpose to obtain an effective MIMO black box modeling of different furnace processes. Data are collected via a particular closed loop swinging regulation to exploit high frequency modal response of the furnace. The model used for parametric linear MIMO analysis utilize Finite Response Filters scheme applied on direct measured quantities or soft sensed ones. The resulting transfer functions from system identification procedures allow good prediction on local furnace behaviors and these can be utilized for synthesis of advanced controllers., Proceedings of the 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden, pp. 552-560

The paper deals with the experimental activities on a biomass combustion test-bed. More in detail, experimental campaigns have been devoted to investigate the operation of a biomass moving grate furnace.A research-oriented facility based on a moving grate furnace (350kW) has been set up in order to perform experimental activities in a wide range of test configurations. The paper reports the description of the complete biomass-plant and the assessment of the system operation. As first step, the chemical and physical properties of the used wooden biomass have been preliminarily investigated. Once the biomass-fuel has been characterized, investigations have been devoted to point out the operation of the furnace. It has been operated at full load, highlighting the influence of biomass on particulate matter emission., Proceedings of the 25th European Biomass Conference and Exhibition, 12-15 June 2017, Stockholm, Sweden, pp. 603-610