1 main features
The future development of the dryer will be based on an in-depth study of the drying mechanism and material drying characteristics, and mastering the optimal operating conditions for different materials to develop and improve the dryer; in addition, large-scale, high-strength, high-economical, and improved adaptation to raw materials Performance and product quality are the basic trends in the development of dryers. At the same time, further research and development of new and adaptable dryers such as combined dryers, microwave dryers and far-infrared dryers.
2 Development potential
The development of dryers should also pay attention to energy conservation and comprehensive utilization of energy, such as adopting various combined heating methods, transplanting heat pump and heat pipe technology, developing solar dryers, etc .; also developing automatic control technologies for dryers to ensure the realization of optimal operating conditions In addition, as human beings attach great importance to environmental protection, improving the environmental protection measures of the dryer to reduce the leakage of dust and exhaust gas, etc., will also be the direction of in-depth research.
The current status of China's dryer equipment market and analysis of the current needs of the United Nations, conventional drying equipment in the domestic market, and major international market drying equipment are basically made in China, which indicates that the history of import-oriented drying equipment in China has ended. However, there are still some problems and difficulties. According to the prediction of the China General Machinery Drying Equipment Industry Association, in the next few years, the chemical industry in China will have about 3000 (sets) of drying equipment; the annual demand for pharmaceutical drying equipment will reach 3000 (sets) ); The annual demand for agriculture, forestry, food, light industry and other industries, such as drying equipment, is expected to reach about 5000 (sets). At present, the domestic market share of drying equipment has reached more than 80%.
It is estimated that during the "Tenth Five-Year Plan" period, China's domestic market share of drying equipment will reach 90%. At present, there are two methods of regional focus on performance problems and technological innovation capabilities. Most of the concentrated production enterprises in China's drying equipment industry gradually produce early-stage enterprises on the basis of this industry. The relatively concentrated geographical location and serious staffing defects exist. So far, the enterprises are mainly distributed in Jiangsu, Zhejiang, Shanghai, Liaoning, and black. These enterprises account for almost 50% of the total industry. In contrast, there are some regions where there is no drying equipment manufacturing in China. Business. In highly competitive industries, some companies focus on the immediate results, do not require any systematic development, improve the overall quality, progress slowly, and seriously hinder the normal development of the industry. Technology development has not been strong since the reform and opening up, especially in recent years, China's economic growth potential has been effectively released, the supply and demand of the shortage economy have undergone fundamental changes, and a buyer's market has initially formed. Under the pressure of the buyer's market, some companies are catching up in the market, instead of looking for and developing new markets. Enterprises focus on the market demand in the near future, more mature products. Therefore, in ovens, vibrating fluidized bed dryers and other products, manufacturers are more concentrated and more competitive. The drying equipment industry is engaged in the development of small enterprises, new products, and the perfect introduction of new products are mainly imitating each other. It is recommended to develop advanced technology and improve product quality. Compared with developed countries, China's drying equipment technology still has a certain gap in the same industry. The current market is dominated by products with low technological content. China's entry into the WTO will have more international counterparts entering the domestic market, and with increasingly serious international competition, we will face tremendous competitive pressure. Drying equipment manufacturers such as Danish Nilu Group Co., Ltd. Ogawara Japan have set up branches in China one after another to seize the Chinese market. With the acceleration of economic globalization, more companies will target the Chinese market. Increasingly fierce competition requires us to absorb foreign advanced technology, innovation and improve product quality through the progress of enterprises. The idea is to develop products to large-scale equipment, control the degree of automation, quality, surface treatment equipment, efforts to select anti-corrosive materials, and develop multifunctional combination machines, and the product life cycle continues to extend. Industry associations should organize enterprises to participate in international technology exchanges and absorb the results of new technologies in order to speed up the entire industry and improve technology levels. Adjusted enterprises to cultivate their core competitiveness in China are characterized by enterprises in the dry industry that do not do this, are not strong, are not suitable, and not perfect, but the overall quality is not high, most enterprises are lagging behind in management and do not meet the corresponding economies of scale Through the guidance and coordination of industry associations, change the situation of blind development.
Jiangsu, Zhejiang, Shanghai, with relatively concentrated 3 companies can consider using the joint venture, cooperation and acquisition of the central and western regions to migrate to find a wider space for survival and development of the enterprise. The industrial enterprises are on the road to becoming stronger and stronger, and have cultivated some technical strengths, well-known brands and large companies and enterprise groups with independent intellectual property rights. Formed its own special products and special services. The relatively low innovation capacity of drying equipment manufacturing enterprises in China, the introduction of new technologies and new products with independent intellectual property rights, a few companies, this is an important reason for the slow development of drying. At present, there are dozens of universities and research institutes engaged in research and development of drying technology, which are located in eastern, western, and southern China. Most of the knowledge achievements have not been effectively transformed into real productivity. Enterprises becoming the main body of technological innovation should be directly related to various forms of unions of these universities and research institutions. Therefore, reasonable resource allocation and use can effectively cultivate and develop innovative enterprises.
Looking ahead, the focus of the competitive drying equipment industry will focus on product quality, technology, service and price. The types of equipment used in drying, hot air will be based on dry air heating equipment, vacuum drying equipment, other equipment, such as far-infrared drying, flash dryer microwave drying equipment, and other users in special fields will also gradually expand the number of applications. The demand for large standard equipment in food, pharmaceutical drying, and vacuum freeze-drying equipment will increase, and the demand for combined functions (such as granulation drying, drying-filter) equipment will increase, and highly automated drying equipment will be affected in some applications welcome. In addition, the emergence of drying equipment will have more and more emphasis on quality, corrosion-resistant material drying equipment and reliable performance, will pay special attention to users. At present, the drying equipment industry has begun to enter a more mature development stage, which can better meet the actual needs of users in various fields. The price of similar foreign products is only 1/3, which makes the drying equipment in China more competitive than the imported equipment in the market. The price has obvious advantages; on the other hand, most of the larger drying equipment also involves on-site installation, commissioning and after-sales service work. For domestic users, the choice of imported equipment for domestic equipment has more options and is more convenient. In the international market, China's entry into the WTO makes drying equipment more conducive to expanding exports. At present, China's main export products are vacuum drying equipment, drying equipment, drying equipment, vibration, small and medium-sized grain, agriculture, forestry, food and local product drying equipment, with an annual export volume of more than 100 vehicles, mainly exported to Southeast Asian countries and other developing countries. Countries and opened their doors to European and American markets. At present, China's exports account for less than 5% of the total amount of drying equipment. Experts predict that the total domestic share of drying equipment and drying equipment for export products during the Tenth Five-Year Plan period will exceed 10%. International competition. The main competitors of drying equipment manufacturers in China are Denmark, Switzerland, the United Kingdom, Germany, the United States and Japan. Compared with competitors, the advantages of drying equipment in China are very cheap, which is mainly due to the lack of products that control the degree of automation, appearance quality, feature set and combination areas have been further improved. Therefore, domestic drying equipment manufacturers should take full advantage of China's accession to the WTO, strengthen technical exchanges, and learn from foreign countries' advanced drying equipment and drying equipment to accelerate the improvement of China's degree of automation and control, and the quality of appearance. Feature set and combination, and narrowing down with foreign products to improve the trust of our products in users, therefore, drying equipment in China can be performed not only in the domestic market, but also in foreign markets. China is producing more and more varieties of drying equipment, expanding the scale, the level and quality of products are increasing rapidly, and more and more market competitiveness. In particular, the Chinese government supports relevant export policies, and the production of drying equipment creates good external conditions for domestic enterprises, which indicates that China has a promising development of drying equipment.
Conversion of dryer unit heat consumption and drying capacity
Heat consumption and production capacity are important indicators of the grain dryer test, but due to environmental conditions,
Due to the variability of the drying medium conditions, the test results are often not comparable. Therefore, the performance test data of the dryer must be converted to a recognized standard condition for comparison and calibration. Based on the test data of grain dry dryers, this paper studies and explores the unit heat consumption and production capacity conversion coefficients of root dry food dryers with reference to domestic and foreign root food dryer test standards. Four conversion methods are analyzed and analyzed. The calculation methods and steps of the conversion coefficient of the grain dryer under different environments and grain conditions are described. The advantages and disadvantages of the various methods are described. Preliminary suggestions for the conversion method are presented. The comparability of the test data of the dryer and the improvement of the dryer are presented. The test criteria provided the basis.
China is the world's largest food producer, with a total annual grain output of 500 million tons. Every year, the weather is rainy and the drying equipment is insufficient to cause the mildew loss of grain by up to 5%. After more than 30 years of development, China's grain drying equipment and technology have reached a certain level and played an important role in agricultural modernization. However, compared with China's demand for drying equipment, there is still a large gap. Taking rice drying as an example, the number of rice dryers in Japan has reached 1.1 million units, and the level of mechanization of rice drying has reached more than 90%. However, less than 1% of rice is mechanically dried in China, and rice drying equipment is less than 10,000. station. There are many reasons for the above-mentioned gaps, and the backwardness of the research on the technical standards for grain drying is also an important reason. At present, China still adopts the national standards of the 1980s (such as grain dryer test methods and grain drying technical conditions). Some of these conditions and indicators are no longer suitable for the needs of the current dryer development, such as the lack of dryer production in the existing standards. The conversion methods of capacity and unit heat consumption are not yet complete and reasonable. Some indicators do not specify a uniform test method, and some indicators are relatively backward, which restricts the development, promotion, and application of new grain drying equipment and processes. . The international technical standards for grain drying have been revised many times, such as 501,202: 1997; the determination of drying performance of agricultural grain dryers, such as 15011520-2: 2 printed l. In these new drying technology standards, there are conversion methods for the main drying performance parameters. There are dozens of models and formulas used [because it is a relatively complex and difficult problem, there is no such technology in China's grain drying technology standards. In this regard.
Grain drying is a very complicated process with many influencing factors and changing drying conditions. Among the influencing factors are medium parameters (such as hot air temperature, hot air volume, and hot air humidity), and grain parameters (such as grain type, grain moisture, and grain temperature). And grain flow), environmental conditions (such as atmospheric temperature and atmospheric humidity), drying processes (such as co-current drying, counter-current drying, cross-flow drying, mixed-flow drying), and structural parameters of the dryer. A grain dryer may work at a very low ambient temperature (-20 ° C below zero), or it may work at an environmental condition as high as 30 ° C. The working conditions are completely different, or even very different. The index is converted to a uniform and recognized drying condition.
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