.1 The following 160T/24H flour mill is specially designed according to hard wheat.
1.2 This design adopts the technical process of extracting flour from medium and long flour scheme in the milling workshop and 10 MMD25/100 pneumatic automatic roller mills to consist the 4B7M1S1T milling technique with 4 purifying and two bran scourings which is full blown in Europe. 4B has coarse and fine systems; bran pieces from upper section of plansifter is treated with bran scourer to shorten the process of break system. Middling system, semolina system and 1T system all adopt smooth rollers and combine with impact detacher to reduce the power of rear milling stage. Roller’s contact length is 12.50mm/100Kg wheat•24h; sieving area is 0.088m2/100Kg wheat•24h; purifier’s unit sieve surface width is 1.84mm/100Kg wheat•24h.
1.3 In consideration of environment protection requirements, it’s suggested that dry cleaning method which is usually adopted by Europe be used for wheat cleaning process and meanwhile intensive dampener with computer feedback device be used to reach the moisture suitable for milling. The process includes two sievings, two scourings, one de-stoning, two dampenings, three magnetic separatings and multiple air suctions before the clean wheat enters break system. This is to ensure wheat purity. All the equipment is fully enclosed.
1.4 In tropical humid areas, 18 hours conditioning time is required for clean wheat before it enters break system; in tropical arid areas, the conditioning time is longer than 18 hours.
1.5 This technical process has the following economic and technical index: if it mills one grade, total flour extraction rate is 75%, cumulative ash content is 0.53～0.62%; if it mills two grades, the extraction rate of grade 1 is 45%, its ash content is 0.45～0.55; the extraction rate of grade 2 is 30% and its ash content is 0.65～0.73%. The above mentioned ash content is calculated on dry basis. For normal milling, the power consumption per ton flour is not higher than 65kW•h.
1.6 Flour is transported to packing workshop 120 meters away by conveying system. There is a small bag packing workshop 20 meters away from milling workshop. A electric valve distributes the flour to either packing workshop.
1.7 Inferior and bran are packed directly. All the organic leftovers will be crushed by a crusher and then mixed with bran.
1.8 Total installed capacity is 597kW.