Energy Properties of Torrefied Biofuel from Cellulose
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Abstract
Due to the rise of concern for recycling, waste paper to produce recycled paper and paperboard is recovered in individual countries of the world. The global recovery rate is around 58% in 2014. But some paper such as beverage paper containers and the low quality waste paper are not suitable to the material for recycling. The utilization of the above paper as a solid biofuel to replace coal is considered to be reasonable from the standpoint of cascade cyclic utilization of waste biomass. The waste paper is mainly composed of cellulose and has a good property of low water content, but its heating value is two-thirds of coal. In the present study, the cellulose is reformed by the torrefaction and it is assumed that the torrefied biofuel from cellulose is utilized for the biomass and coal co-firing at existing coal power plants. There are two objectives in the present study. The first one is to correlate the energy properties of torrefied cellulose with the mass yield. The second one is to clarify the optimum mass yield condition to produce torrefied biofuel from cellulose using the modified energy analysis model. From the results, it is found that torrefaction has a positive effect on the reduction of carbon dioxide emission in the case that the energy consumptions for production and transportation of torrefied biofuel are relatively high.
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