METHOD OF TIMBER DRYING AND ASSOCIATED DEVICE Russian patent published in 2009 - IPC F26B5/04 F26B9/06 

FIELD: heating; drying.

SUBSTANCE: invention relates to construction industry and woodworking industry. Particularly, it is referred to the fast drying technologies of timber, including large size timber pieces. Timber drying method and associated device include transporting and storage operations with trolleys, process operations in two working chambers lasting at an interval, at least, 30 minutes, drying agent heating, moving and distributing in piles by means of heaters, reversible fans and flow dividers. The next stages of the method include timber softening and moisture distribution around the timber cross section with the use of hot water, steam and damping system. Then, timber is exposed to heating, atmospheric pressure or residual vacuum. The steam-air mixture is removed from the working chamber to vacuum chambers by cyclic vacuum pulses at power corresponding to their volumetric ratio. After that, vacuum conditions are intensified in time in the vacuum chamber by means of vacuum pump. The process is controlled by pressure, temperature, moisture and damping medium volume. The volume of cylindrical drying chambers is within 2.5÷3 from the pile volume being at the same volumetric ratios with vacuum chamber as 1 to 1.1÷1.2. The fans and heaters make the drying agent flows movement and heating being evenly distributed between the pile lines and gradually removed from the chambers. According to the parallel diagram, the fans and heaters are mounted on the upper part of the shells. They are mounted together with the mainline pipes of liquid high-temperature coolant heating and circulation units. There is a heater and two fans in each unit. Taken together, they form working zone of the even drying agent flow and working medium and flow dividers located on the sides of the shell. There are nozzles on one side of the flow dividers. They are implemented in the shape of truncated cone and located symmetrically and parallel to gaskets lines having flow area selected from the range of D_y= 10÷15 mm and D_y=45÷50 mm for the inner volume of chamber being equal to 1 m³.

EFFECT: improvement of process monitoring conditions by pressure due to gradual moisture transfer and production cost reduction by changing geometrical shape of working chamber shells replacing box-like chamber with cylindrical chambers while ensuring rational items layout.

2 cl, 5 dwg