It is imperative to popularize energy-saving dryin

2022-08-20
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It is imperative to promote energy-saving drying technology in China

driven by the national energy-saving policy, as a drying equipment with large energy consumption, the energy used accounts for about 12% of the total energy consumption of the national economy. Compared with spraying, directcoating process has another advantage of energy consumption. Energy saving has naturally become the future development direction of drying equipment, especially in the current situation of weak traditional market demand and increasing user demand for energy-saving and emission reduction drying devices, it is imperative to promote energy-saving drying technology

as a drying equipment manufacturing enterprise, although its own energy consumption and resource consumption account for a small proportion, facing the severe challenges of energy and environmental protection, enterprises generally believe that they should shoulder the mission of providing energy-saving and environmental protection products for the chemical industry. This is the news obtained from the 14th National drying technology exchange meeting held in Changzhou, Jiangsu Province from October 12 to 14

it is understood that since the early 1980s, China's industrial drying technology has developed rapidly in the past 30 years. The product varieties have developed from more than a dozen to more than 60 at present. The commercial dryer has developed from zero to 20000-30000 units per year. Some large domestic drying equipment has replaced imported equipment to equip domestic chemical enterprises. However, insiders generally believe that domestic enterprises still have great room for improvement in energy-saving drying technology. At present, the proportion of drying energy consumption in China's total industrial energy consumption is almost twice that of the UK. In the future, enterprises should further seek energy-saving technology upgrading. A participating expert told

at present, domestic enterprises have strong production capacity for disc dryers, paddle dryers, steam tube rotary drum dryers, vacuum belt dryers, tube bundle dryers and other equipment using conductive drying technology. For example, the disc dryer has 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 University of technology is still developing larger-scale and electromechanical integration equipment with a diameter of more than 5 meters; The steam tube rotary drum dryer has various models with a diameter of less than 4.2 meters, and the 1million ton/year PTA drying project, 330 ton/hour and 400 ton/hour coal humidification large-scale devices have been localized

combined drying technology is also an energy-saving technology recommended by experts. The so-called combined drying is to connect two or more dryers to make the combined device have the performance of different dryers in the drying process, so as to achieve the purpose that can not be achieved with a single dryer. Because graphene also has extraordinary thermal conductivity and electrical conductivity, it can better save energy than a single dryer

practice has proved that by controlling the moisture content of the dried materials, the thermal efficiency can be significantly improved and the energy saving effect can be achieved. Therefore, he proposed that the industry should advocate the combined drying method of segmented drying of material moisture, such as the combination of spray dryer and vibrating fluidized bed dryer, the combination of paddle dryer and convection dryer, the combination of paddle dryer and disc dryer, etc

in addition, the use of solar energy and biomass energy as drying heat sources has also been mentioned by insiders. Experts told that foreign countries have begun to vigorously develop green drying and carry out technical energy-saving drying, such as drying with solar, wind and hydro energy. For example, the new solar rice drying system developed by Japan gold drying company is a greenhouse type solar drying system, which comprehensively applies several heat transfer forms to give full play to the advantages of various heat transfer forms at different stages of drying, so as to make the energy utilization of equipment more reasonable. The experts at the meeting proposed that the domestic drying industry should pay more attention to this and actively and effectively explore this field

compared with foreign countries, there is still a certain gap in drying technology in China, which is mainly reflected in the shorter time of molding each component. First, the energy-saving technology is not perfect. At present, there are not many combined drying equipment in China, but they can be often seen in foreign literature, and the forms of combination are also diverse. The promotion of combined drying technology in China can well solve the problem of energy saving, which will become the development trend of domestic drying equipment in the future. Cha Guocai said

in the early stage of the drying process, air convection drying with spray heat collection frequency of more than 100Hz can not only reduce costs, but also achieve the desired drying effect. However, in the later stage of the drying process, the drying rate of ordinary spray drying is significantly reduced, making it difficult to further dry the materials, while microwave drying can still maintain a high drying rate. Therefore, microwave drying in the later stage of the drying process can improve energy efficiency and achieve the purpose of energy saving and consumption reduction

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