GÓMEZ BAREA , Alberto

This work investigates a circulating fluidized bed boiler, originally designed for air-firing, retrofitted to oxy-firing with the purpose of removing the CO2 emission from coal combustion. Previous studies have shown that the heat balance on the gas-particle side can be satisfied without changes in the boiler, but then the volume flow of gas is...

Gas distribution through the chambers of a loop seal in circulating fluidized bed (CFB) units is still difficult to predict and often misunderstood. Dedicated experiments were carried out in an isolated loop seal to assess how the gas fed into a loop seal is distributed under different aeration modes (through the recycle chamber, the supply...

Dispositivo para inducir hipotermia terapéutica, que comprende una bomba sanguínea combinada con un refrigerador termoeléctrico de tipo Peltier que permiten extraer sangre del cuerpo del paciente, modificar directamente la temperatura de la sangre del pac

Recently, the European Parliament has decided to include a specific reference to "Enhanced Landfill Mining" (ELFM) in the Landfill Directive proposing a regulatory framework for ELFM so as to permit the retrieval of secondary raw materials that are present in existing landfill sites. Recent studies are supporting ELFM since they consider that...

A simple method is proposed to evaluate the performance of fluidized bed reactors where an nth-order gas-solid reaction occurs. The method takes into account the fluid dynamics of the fluidized bed by a two-phase flow model and the rates of diffusion in the solid reactant particles (internal and external) by a simple particle model. Approximate...

The use of alkaline residue from the acetylene industry (carbide slag, CS) as in-bed sorbent to remove H₂S from syngas from biomass/waste fluidized bed (FB) gasification was investigated. Measurements were conducted in a laboratory FB applying differential conversion technique, tracking the reaction using both gas measurements and solid...

The potential to conduct allothermal steam-gasification of biomass using a dual fluidized bed gasifier (DFBG) assisted by solar energy has already been conceptually proposed. In this paper the design and operation of a solar DFBG (SDFBG) device to deal with this concept is assessed by modeling, considering thermodynamic, kinetic and...

The management of sewage sludge still represents a challenge in the EU sustainability plan for biowaste. Although there are consolidated alternatives for the valorization of sewage sludge (incineration, pyrolysis and gasification), technical issues related to heavy metals and other pollutants are not sufficiently understood considering the...

This study evaluates the benefits of integrating a full renewable dual back-up system (biomass and Thermal Energy Storage (TES)) in Concentrated Solar Power (CSP) plants. Two plants of 50 MWe capacity each are modelled and simulated, based on Parabolic Trough and Solar Tower technologies, with the integration of a biomass grate boiler in...

A hydrodynamic model of a dual fluidized bed gasifier (DFBG) is developed and its predictions are compared with measurements of solids flux and pressure profiles from a cold flow model (CFM). Then, the performance of a DFBG gasifier is theoretically analyzed in terms of solids circulation and solids distribution under changes in riser and loop...

A biomass gasifier coupled to an oxy­combustion boiler is an attractive concept, enabling simultaneous production of syngas of medium heating value and carbon "capture" from concentrated CO2 taken from the flue­gas of an oxyboiler. Pure oxygen is available for the gasifier, because it is produced for the oxyboiler, taking advantage of the...

This work provides literature data on the characteristics of biomass pyrolysis. It is analyzed the behavior of product yields and properties on pyrolysis peak temperature dependence (within 200-1000ºC). Empirical relationships are derived from the collected data, which can be used to approximate the elemental composition and heating value of...

Gasification of biomass in a fluidized bed (FB) was modeled based on kinetic data obtained from previously conducted thermogravimetric analysis. The thermogravimetric analysis experiments were designed to closely resemble conditions in a real FB gasifier by using high sample heating rates, in situ devolatilization and gas atmospheres of H2O/H2...