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Compared with developed countries, domestic products still have a certain gap between quality and technical level. Therefore, China's drying equipment manufacturers must continue to learn from international advanced technology, combined with practical experience, explore new technologies, develop new technologies, and come up with new products to participate in international competition. The trend toward large-scale, high-intensity, and high-efficiency continues to grow.
At present, the low level of automation of domestically produced drying equipment and the backwardness of control means are common problems. As far as the current level of automation is concerned, it is not difficult to solve the control problem in the drying equipment, but what is lacking most is the problem of the reasonable combination of the automatic control technology and the drying equipment. Different materials require different dryers. Similarly, there are major differences in the requirements for control methods for different materials.
As we all know, each drying equipment has its specific scope of application, and each kind of material can find several kinds of drying equipment that can meet the basic requirements, but the most suitable one can only have one kind. If improperly selected, users must not only bear unnecessary one-time high procurement costs, but also pay a heavy price during the entire use period, such as low efficiency, high energy consumption, high operating costs, poor product quality, and even equipment devices. It can't work normally.
The role of automatic control in the dryer is getting bigger and bigger, but its one-time investment is also the issue that people are most concerned about. Sometimes the investment in control equipment even exceeds the investment in the mechanical part of the dryer. It is also the subject that research should be carried out to determine a reasonable control plan for dryers and drying process requirements and to determine appropriate control measures for specific drying projects.
In addition, it should also pay attention to the magnification of drying equipment. The enlargement involves disciplines such as fluid mechanics, mechanics, thermodynamics, heat transfer, materials science, dust removal, corrosion protection, electrical appliances, and control. It is very likely that some problems will arise during the amplification process. Therefore, the amplification of the drying device is by no means a simple geometrical enlargement.
In this respect, it largely depends on the experience of industrialization, the mastery of the physical properties of materials and the understanding of drying equipment. The phenomena that may occur during the enlargement process should be predicted rationally and objectively, and corresponding solutions can be proposed. The so-called research amplification effect is to grasp the drying theory and drying technology while paying attention to accumulating practical experience and summing up lessons.
Domestic dryers are becoming large-scale, high-strength trends. Dryers are classified into normal-pressure dryers and vacuum dryers. Operation under vacuum can reduce the partial pressure of moisture in the space and accelerate the drying process, and can reduce the boiling point of moisture. And the material drying temperature, steam is not easy to leak, so the vacuum dryer is suitable for drying heat-sensitive, easy to oxidation, explosive and toxic materials and wet steam recovery occasions.
The development of dryers should also pay attention to energy saving and comprehensive utilization of energy, such as adopting various joint heating methods, transplanting heat pump and heat pipe technology, developing solar dryers, etc., and developing automatic control technology of dryers to ensure optimal operating conditions. In addition, as humans attach importance to environmental protection, improving the environmental protection measures of the dryer to reduce the leakage of dust and exhaust gas will also be the direction that needs further study.
As the quality of equipment, supporting components and basic research still need to be further improved, conventional drying is still the main form of drying. As each kind of drying has its own advantages and application scope, combined drying will be the trend of future development.
The boiling granulation dryer, commonly known as the domestic one-step granulator, was designed after the introduction of foreign products of the same type in the 1980s and was designed after digestion, absorption and improvement. Due to its simple operation, superior performance and excellent manufacturing, the equipment can meet the requirements of GMP regulations for the pharmaceutical and food industries, and is welcomed by users in the pharmaceutical and food industries. The device is especially suitable for drying and granulating Chinese and Western medicines and foods. The obtained particles have strong disintegration degree, good fluidity and fast dissolving property, and can be directly used for tableting, filling capsules, granules and solid beverages.
Centrifugal spray dryers have achieved ideal application results in dyes, dairy products and other fields. Over the years, the equipment has been widely used, and the level of technology and manufacturing quality have made great strides. In recent years, large-scale centrifugal spray dryers have also received attention in the application of flue gas desulfurization, and the development prospect cannot be ignored.
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 many, but it can be seen frequently in foreign literature, and the combination of forms is also varied. The promotion of combined drying technology in China can solve energy-saving problems well, which will become the development trend of domestic drying equipment in the future.
At present, the low level of automation of domestically produced drying equipment and the backwardness of control means are common problems. As far as the current level of automation is concerned, it is not difficult to solve the control problem in the drying equipment, but what is lacking most is the problem of the reasonable combination of the automatic control technology and the drying equipment. Different materials require different dryers. Similarly, there are major differences in the requirements for control methods for different materials.
As we all know, each drying equipment has its specific scope of application, and each kind of material can find several kinds of drying equipment that can meet the basic requirements, but the most suitable one can only have one kind. If improperly selected, users must not only bear unnecessary one-time high procurement costs, but also pay a heavy price during the entire use period, such as low efficiency, high energy consumption, high operating costs, poor product quality, and even equipment devices. It can't work normally.
The role of automatic control in the dryer is getting bigger and bigger, but its one-time investment is also the issue that people are most concerned about. Sometimes the investment in control equipment even exceeds the investment in the mechanical part of the dryer. It is also the subject that research should be carried out to determine a reasonable control plan for dryers and drying process requirements and to determine appropriate control measures for specific drying projects.
In addition, it should also pay attention to the magnification of drying equipment. The enlargement involves disciplines such as fluid mechanics, mechanics, thermodynamics, heat transfer, materials science, dust removal, corrosion protection, electrical appliances, and control. It is very likely that some problems will arise during the amplification process. Therefore, the amplification of the drying device is by no means a simple geometrical enlargement.
In this respect, it largely depends on the experience of industrialization, the mastery of the physical properties of materials and the understanding of drying equipment. The phenomena that may occur during the enlargement process should be predicted rationally and objectively, and corresponding solutions can be proposed. The so-called research amplification effect is to grasp the drying theory and drying technology while paying attention to accumulating practical experience and summing up lessons.
Domestic dryers are becoming large-scale, high-strength trends. Dryers are classified into normal-pressure dryers and vacuum dryers. Operation under vacuum can reduce the partial pressure of moisture in the space and accelerate the drying process, and can reduce the boiling point of moisture. And the material drying temperature, steam is not easy to leak, so the vacuum dryer is suitable for drying heat-sensitive, easy to oxidation, explosive and toxic materials and wet steam recovery occasions.
The development of dryers should also pay attention to energy saving and comprehensive utilization of energy, such as adopting various joint heating methods, transplanting heat pump and heat pipe technology, developing solar dryers, etc., and developing automatic control technology of dryers to ensure optimal operating conditions. In addition, as humans attach importance to environmental protection, improving the environmental protection measures of the dryer to reduce the leakage of dust and exhaust gas will also be the direction that needs further study.
As the quality of equipment, supporting components and basic research still need to be further improved, conventional drying is still the main form of drying. As each kind of drying has its own advantages and application scope, combined drying will be the trend of future development.
The boiling granulation dryer, commonly known as the domestic one-step granulator, was designed after the introduction of foreign products of the same type in the 1980s and was designed after digestion, absorption and improvement. Due to its simple operation, superior performance and excellent manufacturing, the equipment can meet the requirements of GMP regulations for the pharmaceutical and food industries, and is welcomed by users in the pharmaceutical and food industries. The device is especially suitable for drying and granulating Chinese and Western medicines and foods. The obtained particles have strong disintegration degree, good fluidity and fast dissolving property, and can be directly used for tableting, filling capsules, granules and solid beverages.
Centrifugal spray dryers have achieved ideal application results in dyes, dairy products and other fields. Over the years, the equipment has been widely used, and the level of technology and manufacturing quality have made great strides. In recent years, large-scale centrifugal spray dryers have also received attention in the application of flue gas desulfurization, and the development prospect cannot be ignored.
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 many, but it can be seen frequently in foreign literature, and the combination of forms is also varied. The promotion of combined drying technology in China can solve energy-saving problems well, which will become the development trend of domestic drying equipment in the future.
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