Since the turn of the century, major structural changes have taken place in China's timber supply. Its performance is: First, the proportion of industrial fast-growing timber has gradually increased; second, the proportion of imported timber has risen rapidly. On the other hand, as a large energy consumer 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% and 40%; in addition, drying The pollution caused by the process 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 sulfur dioxide 45 cubic meters, and a small amount of nitrogen oxides, these substances are the main factors causing 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 innovation For example, theoretical breakthroughs have to be made in fundamental researches such as wood moisture migration mechanism, moisture three-dimensional flow field in wood, and wood stress release mechanism. The second is to focus on the research of new technologies and the integration of technological innovation with respect to the characteristics of China's timber resources. For example, for the ever-growing short-cycle plantation forest in China, further researches on the combined drying technology combining wood drying and wood modification and improvement are needed. The third is to advocate green drying and further energy-saving and emission reduction Such as promoting the use of biomass energy, further promote solar drying technology, etc.
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2. pig drinking water was significantly more than 30% savings in water, reducing sewage and sewage treatment pressure.
3. to prevent the metal drinking water to scratch the pigs, to avoid the chance of traumatic infection.
The future development direction of wood drying technology in China