Superheated steam drying peat
     When the peat is used as a boiler fuel, the water content is generally 60%. Result of the dry peat need to consume a lot of energy, so the peat as a fuel is not through dry. But this will reduce the efficiency of the boiler, so many countries have recently considered dry peat as fuel. Superheated steam drying is an effective way to Sweden since 1988 to establish a superheated steam peat drying machine, due to reduce energy consumption, 4,5 years can recover costs.
     In 1970 the Swedish University developed a pressure steam air dryer, which is a closed system. Peat directly in contact with the superheated steam, which not only can be dried peat can also be dried beet pulp, bark, etc. Circulating steam pressure 0.2-0.6MPa, a cyclone separation of steam and material, recycling steam, the excess steam is discharged. Drying time of 10-30s, transporting speed of 20-40m / s. Since the excess steam can recycle, dryer heat consumption is only 500-700kJ/kg water, the general air dryer heat consumption is approximately 3500-4800kJ/kg water.
He1sinki University successfully developed a - kind of a fluidized bed dryer peat, water evaporation capacity of 100kg / h. A pipe heat exchanger people buried in the bed, to provide heating source, from peat in the evaporated water is used as the vulcanizing medium fed from the lower wet peat, peat dry screw is discharged from the bed at bed and tube heat transfer efficiency is low, only 100w / (mmK), after drying pulverized peat average particle size is 1mm. If the use of fine magnetite sand as bed material that allows heat transfer coefficient increases 350w / (mmK), experience has shown that the use of the aircraft, superheated steam fluidized bed dryer is economically viable. Recently, in Sweden built a peat-fueled power plants, at the place of drying peat, drying machine production rate 20t/1h, steam heat exchanger total area of ​​5,500 square meters of heat consumption of the dryer 0.5MJ/kg water, as an ordinary hot air dryer heat consumption 1/7-l/6.

 

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