Pneumatic conveying characteristics in the rice husk powder industry and optimization of engineering process

Abstract

Large-scale biomass pneumatic conveying technology serves the fields of biomass reuse, including agricultural and forestry waste management, and biomass gasification. This study focuses on the dense phase conveying characteristics of rice husk powder in a positive pressure pneumatic conveying system, examining the impact of operational parameters on mass flow rate and solid-gas ratio. The study successfully achieved industrial dense-phase pneumatic conveying technology with a mass flow rate of 3000–10,000 kg/h and a solid-gas ratio as high as 160 kg/kg. A prediction equation for mass flow rate based on pressure drive was provided, which was suitable for this system and provided a design basis for pressure. Based on the design of fluidization velocity, the design basis for the fluidization gas in actual operation was proposed. The phase diagram was used to analyze the conveying state and determine the economic gas velocity. Furthermore, the economic gas velocity was predicted by using the function relationship of Ar and Re numbers, and the prediction deviation is less than 5 %. This work provided a valuable reference for the efficient conveying and processing of biomass particles on a large scale.