Cooling of wood briquettes

Abstract

This paper is concerned with the experimental research of surface temperature of wood briquettes during cooling phase along the cooling line. The cooling phase is an important part of the briquette production technology. It should be performed with care, otherwise the quality of briquettes could deteriorate and possible changes of combustion characteristics of briquettes could happen. The briquette surface temperature was measured with an IR camera and a surface temperature probe at 42 sections. It was found that the temperature of briquette surface dropped from 68 to 34°C after 7 minutes spent at the cooling line. The temperature at the center of briquette, during the 6 hour storage, decreased to 38°C

Effects of operating parameters on maize COB briquette quality

“…Under high pressure and temperature, low molecular weight components become binding elements of particles whereas at high temperature and pressure, moisture evaporates and increases the rate of heat transfer within biomass particles [56].…”

“…Therefore, a minimum amount of moisture in a feedstock is required to act as a binding/catalyst to release low molecular mass products which binds particles together thereby improving briquette strength. However, low moisture content is associated with low rate of heat transfer between particles and therefore the requirement for high compacting pressure [56]. In addition, moisture is responsible for bringing interfacial forces and capillary pressure into play to increase forces of attraction between particles [27].…”

Decision Support System for the Production of Miscanthus and Willow Briquettes

“…The biomass is regarded as a RES of high potential, which can satisfy energy demands of contemporary society both in developed and developing countries throughout the world [6][7][8][9]. The interest in biofuels created from different biomass types including agricultural energy waste and energy cultivations is growing [10,11].…”

“…The work delivered by pressure is partially converted into heat. During densification, the friction and shear in between the particles and between the particles and the briquetting machine, as well as the molecular adhesive forces cause the temperature of the briquette to increase [9].…”

“…Therefore, in the production of solid biofuel (briquette), it is very important to understand the impact of these main factors on the properties of briquette. With this knowledge, product quality can be improved [9,21].…”