Chinese dried Reuters since this century, China's timber supply, there have been significant structural changes, which were as follows:
First, the proportion of industrial fast-growing materials has gradually increased;
The second is the rapid increase in the proportion of imported materials.
On the other hand, as a large consumer of energy in the wood processing industry, wood drying accounts for 40-70% of the energy consumption of wood processing, while the dry heat efficiency is generally low, usually only between 30-40%; in addition, the drying process The pollution caused is often an important source of environmental pollution in China. Taking a steam drying plant with an annual drying capacity of 10,000 cubic meters as an example, the harmful substances discharged per hour are approximately: 40 kg of soot, 1900 cubic meters of carbon dioxide, and 45 parts of sulfur dioxide. Cubic meters, as well as a small amount of nitrogen oxides, are the major contributors to the atmospheric greenhouse effect, acid rain and ozone damage. Since the contribution of energy to environmental protection can reach 70-80%, the energy saving and environmental protection issues of drying technology are particularly important.
Therefore, the innovative development of the wood drying technology in the future has basically the following three aspects:
The first is to strengthen theoretical innovations, such as theoretical breakthroughs in basic research on wood moisture transport mechanisms, three-dimensional spatial flow in wood, and wood stress release mechanisms.
The second is to focus on the characteristics of China's timber resources, pay attention to the research of new technologies and technological integration and innovation. For example, for the continuous expansion of China's short-cycle artificial forest timber, it is necessary to further study the combination drying technology of wood drying and wood modification and improvement.
The third is to promote green and dry, further energy-saving emission reduction, such as the promotion of biomass energy use, and further promote solar drying technology.
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