China Drying Network Drying equipment is a large energy-consuming device. It is imperative to promote energy-saving drying technologies under the increasingly stringent national energy conservation and environmental protection policies. As a drying equipment manufacturing enterprise, although its energy consumption and resource consumption occupy a small proportion, in the face of severe energy and environmental challenges, companies generally believe that they should shoulder the mission of providing energy-saving and environmentally friendly products for the chemical industry. This is the news that the reporter received from the 14th National Drying Technology Exchange Conference held in Changzhou, Jiangsu from October 12th to 14th. It is understood that since the beginning of the 80s of the last century, China's industrial drying technology has developed rapidly over the past 30 years, and its product range has grown from a dozen to more than 60 types. Commercial dryers have been developed from zero to provide 20,000 to 30,000 a year. Taiwan, some large domestic drying equipment has replaced imported equipment and equipment for domestic chemical companies. However, people in the industry generally believe that there is still much room for growth for domestic companies in energy-saving drying technologies. "At present, China's dry energy consumption accounts for almost 100% of the total energy consumption of the entire industry. In the future, companies should further seek energy-saving technology upgrades," said one expert at the conference. For the use of conduction drying technology, such as disc dryer, paddle dryer, steam tube rotary dryer, vacuum belt dryer and tube dryer and other equipment, the current domestic enterprises have a strong production capacity. For example, disc dryers have been able to produce large-scale equipment with a maximum diameter of 3 meters and a maximum area of ​​180 square meters in China. Shijiazhuang Gongda University is also working on the development of large-scale and electromechanical integration equipment with a diameter of 5 meters or more; steam tube Dryers have various types of products with a diameter of 4.2 meters or less, and a large-scale device for 1 million tons/year of PTA drying, 330 tons/hour, and 400 tons/hour of coal moisture conditioning has been realized. Combination drying technology is also an energy-saving technology recommended by experts. The so-called combined drying is the connection of two or more dryers, so that the combination device has the performance of different types of dryers in the drying process, and achieves the purpose that can not be achieved with a single dryer, and thus is more dry than a single one. The device can save energy better. Practice has proved that by controlling the moisture content of the material being dried, the thermal efficiency can be significantly improved and the energy saving effect can be achieved. He therefore proposed that the industry should promote the combination of drying materials moisture drying methods, such as spray dryer and vibration fluidized bed dryer combination, paddle dryer and convection dryer combination, paddle dryer and disc dryer combination Wait. In addition, the use of solar energy, biomass energy as a source of dry heat has also been mentioned by people in the industry. Experts told reporters that foreign countries have begun to vigorously develop green drying, drying technology and energy saving, such as using solar energy, wind energy, water energy, new energy drying. For example, the new solar rice drying system developed by Japan Gold Drying Co., Ltd. is a greenhouse solar drying system, which integrates several heat transfer modes to make it take advantage of various heat transfer modes at different stages of drying, making the use of energy more efficient. reasonable. Experts at the meeting proposed that the domestic drying industry should pay more attention to this and carry out active and effective exploration in this field. There is still a certain gap between China's drying technology and foreign countries. One of the main performances is that the energy-saving technology is still not perfect. "China's current combined drying equipment is not yet very large, but it has been seen frequently in foreign literature, and the combination of forms is also diverse. In China, the promotion of combined drying technology can solve energy-saving problems well. It will become the development trend of domestic drying equipment in the future." In the early stage of the drying process, hot air convection drying is used, which can reduce the cost and achieve the desired drying effect. However, in the later stages of the drying process, the drying rate of ordinary spray drying is significantly reduced, making it difficult to further dry the material, while microwave drying still maintains a high drying rate. Therefore, the use of microwave drying in the later stage of the drying process can improve energy efficiency and achieve energy saving. Ningbo Yinzhou Leisheng Machinery Co.,Ltd , https://www.thundermach.com