バイオコークス技術を用いたコーヒー豆循環システムの実装検証

抄録

In recent years, many coffee chain stores have opened nationwide, and it has become possible to drink drip coffee easily and inexpensively at major convenience chains. However, there is a problem that a large amount of waste is left behind after the extraction of coffee. In this report, in order to solve the problem of coffee grounds in small and medium-sized coffee beverage factories, we examined the energy cycle of processing coffee grounds into Bio-coke and using it as a heat source. Bio-coke is a biomass solid fuel that can be molded from various biomass feedstocks. With a relative weight yield of 100%, its volume can be reduced and it can be stored for a long time. In addition, the manufacturing process is simple and suitable for small-scale distributed use. As a result of examining energy circulation systems that use coffee grounds Bio-coke as heat sources for drying coffee grounds and roasting coffee beans, we have found that this system is feasible. The coffee grounds used in this study had a water content of 70 wt.% before drying and a water content of 2.0 wt.% after drying. Assuming that the low calorific value of 1.0 kg of coffee grounds Bio-coke is 100%, the proportion of each energy required to make 1.0 kg of coffee grounds Biocoke is as follows. The thermal energy required to dry the raw material moisture was 58.6%. The electrical energy useed to heat and compress the coffee grounds to produce Bio-coke was 8.0%. As a result, it was found that 33.4% of the energy of coffee grounds Bio-coke can be used effectively. If 13.1% of the energy is used to roast coffee beans and 0.1% is used to transport coffee grounds Bio-coke, the remaining 20.2% can be used as heat energy for the extraction plant.