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Since the beginning of the 1980s, in the past 30 years, China's industrial drying technology has developed rapidly, and its product range has grown from a dozen to more than 60 types. Commercial dryers have grown from zero to 20,000 to 30,000 per year. 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. “
Zhang Jijun, general manager of Shijiazhuang Gongda Chemical Equipment Co., Ltd., first recommended the conductive drying technology: “From the point of energy utilization, the conductive drying method is 20%-50% more energy-saving than the convection-type drying method. The environmental performance is also better, and it should be vigorously promoted. ."
According to reports, for the use of conductive drying technology of the tray dryer, paddle dryer, steam tube rotary dryer, vacuum belt dryer and tube dryer and other equipment, the current domestic enterprises have 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 domesticized.
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 dryer. The device can save energy better.
Zhang Jijun said that 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 this regard, Cha Guocai, chairman of Changzhou Step Drying Equipment Co., Ltd. holds the same view. He said that 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."
Zha Guocai also took the combination of spray dryer and microwave dryer developed by Step Drying Equipment Co., Ltd. as an example to explain to reporters the energy saving principle of combination drying: the use of spray hot air convection drying in the early stage of the drying process can reduce costs. Cost, but also to 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.
In addition, the use of solar energy, biomass energy as a source of dry heat has also been mentioned by people in the industry. Foreign countries have begun to vigorously develop green drying, and carry out technological energy-saving drying, such as drying with new energy sources such as solar energy, wind energy, and water energy. 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 suggested that the domestic drying industry should pay more attention to this and carry out active and effective exploration in this field.
In short, under the impetus of the national energy conservation policy, as the "energy-intensive" drying equipment, the energy used accounts for about 12% of the total energy consumption of the national economy. Energy conservation has naturally become the future direction of the development of drying equipment. With the increasing demand for energy-saving and emission-reducing drying equipment, it is imperative to promote energy-saving drying technology.
Active exploration of energy-saving technologies Dry equipment environmental protection is imperative
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 industry.