Drying operation involves a wide range of national economy. It is not only an indispensable basic production link for a large number of industrial and agricultural products, but also the energy consumption of China, which accounts for about 12% of the total energy consumption of the national economy. In addition, the pollution caused by the drying process is often an important source of environmental pollution in China, and the progress of drying technology is closely related to the development of the whole national economy.
  Facing the severe energy and environmental challenges, China has recently formulated the strategy and development plan for the development of the medium and long term energy science and technology to the 2020 with a comprehensive, coordinated and sustainable Scientific Outlook on Development. The formulation of the strategy for the development of the energy environment also pointed out the direction for the development of dry technology in China, and explored the dry technology. It is imperative to develop a new way of development.
  Compared with other operations in industrial and agricultural production, the task of energy saving and pollution prevention in drying process is particularly urgent. First of all, drying operations involve a wide range of fields, and China's drying energy consumption accounts for almost half of the total industrial energy consumption than the UK, to 12%. Secondly, the environmental pollution caused by drying is also very serious. In the most widely used conventional drying equipment, more than 3/4 of the drying equipment are hot air drying. The pollution of this kind of drying equipment is very serious, and the transformation of the coal burning furnace in the drying system has become an important issue to be solved urgently.
  Improving energy efficiency in drying process and preventing environmental pollution are complementary. Reducing the energy consumption of 100 million tons of standard coal can reduce over 64 million tons of CO2 and SO2 emissions in China, and its environmental benefits are very significant. Therefore, in the exploration of the new development road of drying technology, the comprehensive, coordinated and sustainable development of energy efficiency, environmental protection and the quality of products must be taken into consideration.
  In order to implement the development strategy of high efficiency and green drying, the first step is to take the road of resource-saving development, and change the single extensive drying into combination and intelligent drying. We should not only transform the drying process fundamentally, but also carry out comprehensive and multi-level energy-saving technological transformation, and vigorously develop the drying technology for the application of renewable energy and industrial waste heat. From the government level, we should establish and improve the comprehensive evaluation criteria and industry standards of dry equipment, establish macro regulation and market regulation mechanism, and accelerate the renewal and replacement of dry technology.