IMPROVEMENT OF CUTTING TECHNOLOGY FOR SUBSURFACE PEAT OF LOW DECOMPOSITION RATE

Cutting of low decomposition rate (to 15%) peat is related with some difficulties. The article discusses disadvantages of the available cutting technology for subsurface peat with the low decomposition rate, which mostly identical to cutting of regular decomposition rate peat, except for the application of air gathering of dried up peat. The difficulties of cutting subsurface peat with the low rate of decomposition are connected with the high initial moisture content, low density and high water absorption capacity. These factors result in the decreased seasonal and cyclic production of peat and, finally, to the essential rise in price of the final product. To eliminate these disadvantages, it is suggested to divide the drying process into two stages.

The first stage is peat spreading on wet ground down to the moisture content of 55–60%, the second stage is peat spreading over slopes of enlarged piles. At the first stage, water evaporates from the surface equal to the area of the field. A major portion of water evaporates in this stage. After stacking dried peat into an enlarged pile, a new area becomes available for cutting. Peat dries on the slopes of an enlarged pile in more comfortable conditions than on the surface of wet field. The pile slopes take more sunshine, the surface temperature grows, the relative humidity lowers, and the positive moisture exchange between the drying peat layer and the wet deposit surface is absent.

The separation of the drying process into two stages allows more peat cutting cycles and higher seasonal production output by 1.5–2 times.

Keywords

Peat of low decomposition rate, cutting technology, field drying, enlarged pile, evaporation, precipitation absorption, air gathering, subsurface peat.

Issue number: 2
Year: 2018
ISBN:
UDK: 622.331:62
DOI: 10.25018/0236-1493-2018-2-0-13-19
Authors: Boltushkin A. N., Belyakov V. A.

About authors: Boltushkin A.N., Candidate of Technical Sciences, Assistant Professor, e-mail: bolt@mail.ru, Belyakov V.A., Assistant Professor, e-mail: belva46@mail.ru, Tver State Technical University, 170026, Tver, Russia.

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