Mj Mark Prins

Thermodynamics of gas-char reactions: first and second law analysis

In energytransformation processes such as combustion, gasi

Torrefaction of wood: Part 2. Analysis of products

cation and reforming of fossil and renewable fuels, the conservation of energy(

More efficient biomass gasification via torrefaction

rst law of thermody namics) as well as the qualityof energy(second law of thermody namics) is important. This studyfocuses on the conversion of biomass with air and/or steam into gaseous components and char represented bysolid carbon (graphite). Energy and exergy (available energy) losses are analysed by calculating the composition of a dry, ash-free typical biomass feed represented by CH1:4O0:59N0:0017 in equilibrium with varying amounts of air and/or steam. The analysis is carried out for adiabatic systems at atmospheric pressure, with input of biomass and air at ambient conditions and steam at atmospheric pressure and temperature of 500 K. For air gasi

Torrefaction of wood. Part 1. Weight loss kinetics

cation, energyand exergyin the product gas have a sharp maximum at the point where all carbon is consumed, the carbon boundarypoint. This is the optimum point for operating an air-blown biomass gasi

From coal to biomass gasification : comparison of thermodynamic efficiency

er. For gasi

Exergetic evaluation of biomass gasification

cation with steam, operation at the carbon boundarypoint is also optimal, but thermody namic process losses hardlyincrease when adding more steam than required. The e9ciencyof steam and air-blown gasi

Exergetic optimisation of a production process of Fischer-Tropsch fuels from biomass

cation was compared using the de

Torrefaction for entrained-flow gasification of biomass

nition of rational e9ciency . Although gasi

Energy and exergy analyses of the oxidation and gasification of carbon

cation bysteam is more e9cient (87.6% vs. 80.5%), this di=erence is expected to level o= if exergylosses for the production of steam are taken into account. The choice between steam and air as a gasifying medium therefore seems to depend more on the required gas compositions. For steam gasi

TORREFACTION FOR ENTRAINED-FLOW GASIFICATION OF BIOMASS

cation, the product gas contains mainlymethane and carbon dioxide, while hy drogen, carbon monoxide, and (at least 38%) nitrogen are the main product gases for air gasi