The Influence of Larch Lumber Drying Technology on the Duration of Dehydration
Journal Title: Lesnoy Zhurnal (Russian Forestry Journal) - Year 2020, Vol 13, Issue 4
Abstract
Convective drying of lumber should be considered as a relatively simple method of elimination moisture from wood. Such technologies are widely used in bringing moisture content in lumber to a certain level. Meanwhile, this drying method is characterized by an increased duration of the process, which automatically increases the expenses for thermal and electrical energy. The drying time of larch lumber is on average higher by 1.5–2.5 times compared to other species, which further increases the cost of drying. Therefore, there is a necessity of finding ways to solve the problem of reducing the drying time of larch lumber in the conditions of convective heat exchange. One of the ways is to develop and apply such drying schedules, which would allow to accelerate the process of wood dehydration. The option of improvement the drying schedules is offered by the Finnish experts of Jartek Oy company. The developed design of the drying kiln allows to implement a two-stage structure of drying schedules: at the first stage with increasing temperature, at the second with decreasing temperature. This paper presents the results of the analysis of the operation of continuous drying kilns with zonal circulation for larch lumber drying. The analysis showed that the direction of drying agent movement along the length of the kiln during larch lumber drying is critical. This conclusion follows from the fact that larch responses in a peculiar way to temperature variations. In the initial period of drying a film of extractives is formed on the surface of the larch вoard. This film blocks the output of an aqueous solution of extractives from wood. In these circumstances, it is advisable to form such schedules that the drying agent temperature with each step of a lumber pile in the drying kiln increases. The specified principle condition for drying larch lumber is observed only in the kiln section, where counter-flow circulation is carried out. The second section, where the direct-flow circulation is implemented, practically runs idle, since the drying agent temperature with each step of the drying pile of lumber decreases. It follows that such designs of kilns for larch lumber drying is impractical for operation.
Authors and Affiliations
Sh. G. Zaripov, V. A. Kornienko
Keywords
Related Articles
- EP ID EP688515
- DOI 10.37482/0536-1036-2020-4-134-146
- Views 276
- Downloads 0
Fiber Cement Soil in the Construction of Pavements for Logging Roads
The most important factor in increasing the efficiency of the development of forest tracts is the development and improvement of the transport and operational condition of the network of logging roads. Inert road constru...
The Density of Pine Wood in Drained Shrub-Sphagnum Pine Forests
The density of wood is a key indicator of its quality. It is necessary to identify the factors affecting the density of wood for its effective and rational use. Knowledge of the features of wood formation in various fore...
Rooting of the Cuttings of Coniferous Species of Dendroflora of the Baikal Region
The active development of production has a negative impact on the environment. Millions of cubic meters of forest are cut down annualy for production needs. These volumes need to be restored. Therefore, research in the f...
The Use of Oxidative Alkali Treatment for Sulphate Hardwood Pulp Bleaching
Pulp and paper plants use chlorine dioxide, oxygen, and hydrogen peroxide for pulp bleaching. The paper aims at analyzing the effect of oxidative alkali treatment with the addition of oxygen and hydrogen peroxide on hard...
Evaluation of Siberian Stone Pine Plantations at the End of the First Age Class
The 40-year-old plantations of Siberian stone pine laid out as a permanent seed plot have been studied. The research purpose is to study the integrity, state and main forest inventory parameters of the Siberian stone pin...