Mill air flow Mill fan speed Material moisture Mill differential pressure Water injection Mixture composition Product transport volume Grinding aid injection Composition of raw material Temperature after the mill Hot gas Grinding roller wear Mill vibrations Fresh air Figure2. VRM control classifiion . Classical control
· Hammer mills process grain and other products in agriculture processes. Industrial hammer mill material handling requires dust collection to prevent combustible dust fires. Handling and transporting agriculture process materials are covered under NFPA 61 and OSHA other industries use hammer mills, which produce dust that may be combustible.