Foreign to the pulse combustor tail pipe drying research
    Pulse combustor tail pipe drying , can take advantage of high-speed tail pipe , hot pulsating airflow and acoustic performance, rapid drying the wet material . Small pulse combustion air dryer drying system by the pressure position , pulsating burner , drying tower and feeding , unloading components. Pulse combustor using a self-driven Rong valve , the operating frequency of 60Hz, rated power of 300kw, opening of 3:1, evaporation of water, 300kg / h. Wet material , such as sawdust , lard, crushed cereal straw , waste lees direct injection into the tail pipe . In the tail pipe , the material in the turbulent airflow and temperature difference between good dispersion of the joint action , to strengthen dry. Then, the material into the drying tower , further evaporation of water . If dry cyclone part of the product collected in the feed back mixing , the initial moisture content of the material can be reduced to improve the dispersibility of the wet material . If the moisture content of the final product requirements are minimal ( ie, high-intensity drying ) , it will return the product discharged from the cyclone drying tower . Exhaust gas drying tower , to be recycled to the combustor cooling layer pipe , while reducing the initial temperature of the smoke gas escape . Recycle gas drying system to provide a safe internal environment , and the recovery of the exhaust gas energy.
    From 1965 to 1969 , the U.S. Minerals Bureau developed for drying lignite pulse combustion device . 1966 first made in propane-fueled , power of 292kw prototype , followed by the successful development of three kinds of dry powder process produces lignite -fueled power pulse combustor drying device . Burner lengths 3.66m, 6.10m and 10.7m, the smallest power of the burner 0.3-1.37Mw, maximum operating frequency of the burner 15Hz, power 7.3Mw. . The lignite power drier powder as fuel at startup when the first ignition of the fuel propane preheated to a certain temperature , the sprayed into blended with 3% ( calorific value ) of lignite powder, propane or oil burner , continuous work . Burner itself is a Schmidt -type burner , with air inlet valve pneumatic tube , you can self-priming work without blowing equipment . Section of the combustion chamber of the internal diameter of 146.3mm tube connected to a convergent cylindrical cone pipe, length is 305mm; tailpipe diameter of 102mm, the entire burner length 203mm, length 15.24m. Be dried lignite from the hopper by screw feeder to the drying tube entrance, a high-speed pulse burner outlet airflow automatically pumped into the drying tube . Dried lignite flows into a collection chamber . This design without additional lignite conveyor using pulsating burner exhaust momentum , set heating and drying and conveying in one lignite . Improves the overall efficiency of the device , to simplify the mechanism . The drying machine drying lignite per hour 3.2t.