Investigation of technological processes of wheat straw preparation for the synthetic diesel fuel production

Abstract

The straw of cereals could be utilized for synthetic diesel fuel production. The research of raw materials preparation technological processes to produce synthetic diesel fuel is relevant, because this scientific area is little investigated. The physical-mechanical properties of these raw materials are important for handling and transportation processes. From these properties depends harvesting of raw materials, storage, transportation logistics, conversion technology and selection of equipment and operation. The work carried out on winter wheat straw preparation of synthetic diesel fuel production processes and raw materials physical-mechanical properties. There were established the chopped and milled wheat straw physicalmechanical properties (chaff moisture content, bulk density, fineness, natural slope and fall angles and a coefficient of dynamic friction), and required energy consumption for straw milling. It was found that flow angles at various processing stages of synthetic diesel differed slightly, and milled wheat straw bulk density was more than two times higher than chopped. Wheat straw chaff fraction was significantly coarser than mill: more than 2 mm particles of chopped wheat straw were 69.30±2.63%, and wheat straw mill was only 7.36±1.85%. Dust of investigated variants amounted to 4.02±1.17 and 7.83±1.52% respectively. It was determined that after three-times increase in the supply of wheat straw chaff mass to the mill, the power consumption of the milling increased by approximately three times (273%), and mill productivity increased only about two times (204%). While increasing of wheat straw chaff load and movement velocity, the dynamic friction coefficient and, respectively, the optimal inclination angles of raw material storage and transportation implements walls decreases.