关键词: 生物质, 旋压成型, 生产率, 吨料电耗, 成品密度, 参数优化

Abstract: Biomass is an important renewable energy resource. The preparation of solid biomass briquette fuel by rotary extrusion has the advantages of simple process and high productivity, but there are still some problems in the application of this technology, such as high energy consumption of equipment and unstable quality of products. Taking the biomass spinning molding equipment with forced feeding system as research object, this study analyzed the influence of feed frequency, wheel speed, ratio of mold length to diameter, proportion of bacteria residue and raw material moisture content on productivity of the densification device, energy consumption and product density using mixed horizontal orthogonal testusing and carried out the optimization of multi-objective evaluation. Results showed that all the experimental factors had significant impact on productivity of the densification device, energy consumption and product density. But the optimal combination of different evaluation index was not consistent. The optimal combination of multi-objective optimization result was feed frequency 60 Hz, wheel speed 65 r/min, ratio of mold length to diameter 6, proportion of bacteria residue 5% and raw material moisture content 10%. Testing results indicated that productivity of this combination was 5.2 t/h, energy consumption was 38.5 kW·h/t, and the product density was 0.84 g/cm3.

Key words: biomass, rotary press modelling, productivity, energy consumption, product density, parameter optimization