Application of the hottest microwave low temperatu

Application of microwave low-temperature vacuum drying equipment in the pharmaceutical industry

Application of microwave low-temperature vacuum drying equipment in the pharmaceutical industry I. overview

microwave vacuum drying equipment is a new type of microwave energy application equipment combining microwave energy technology and vacuum technology. It combines a series of advantages of micro wave and vacuum drying, and overcomes the shortcomings of long cycle and low efficiency of conventional vacuum drying. In the drying process of general materials, Compared with the conventional method, the work efficiency can be improved by 4 ~ 10 times. With the advantages of high drying output, good quality and low processing cost, microwave vacuum drying equipment is a high-tech product integrating electronics, vacuum, mechanics, thermodynamics, program control and other disciplines. It is a new technology and process developed on the basis of in-depth research on physical changes of substances, internal and external heat and mass exchange and water migration process under vacuum conditions in the drying process. In large-scale industrial production, many items cannot be dried under the functional conditions of high-temperature force value automatic shift, zeroing and data query, such as some drugs, chemicals, nutritious foods, as well as high-end Chinese herbal medicines such as ginseng and pilose antler. In order to ensure the quality of products, the drying treatment must be carried out at a temperature lower than 100 ℃ or at room temperature. It is well known that the air pressure is reduced, and the boiling point of water is also reduced, For example, at one atmospheric pressure (101.3kPa), the boiling point of water is 100 ℃, while at 0.073 atmospheric pressure (7.37kpa), the boiling point of water is 40 ℃. Under vacuum conditions, heating the object can make the water inside the object evaporate without heating up. Because it is difficult to conduct air convection heat transfer under vacuum conditions, only by means of heat conduction to provide heat energy for materials. Conventional vacuum drying methods have slow heat transfer speed, low efficiency, and difficult temperature control. Microwave heating is a kind of radiation heating, which is the direct interaction between microwave and material, so that it can be heated inside and outside at the same time, without transferring heat through convection or conduction, so it has fast heating speed, high drying efficiency and easy temperature control

foreign developed countries began to develop industrialized microwave vacuum drying equipment in the 1980s, and achieved good results in practical application. France international microwave company uses microwave vacuum drying equipment to process seedless raisins. The traditional process of 65 ℃, 24-hour hot air drying is changed to 50 ℃, 5-hour microwave vacuum drying. The product quality and output are greatly improved. In the late 1990s, our company took the lead in the research and development of microwave vacuum equipment in China. Through several years of efforts, we completed the development of industrialized 10kW microwave vacuum drying equipment in 2000. It provides a new and efficient drying equipment for pharmaceutical engineering, biological engineering, chemical engineering, material engineering and deep processing of agricultural and sideline products

II. Advantages of microwave vacuum drying equipment

1. High efficiency

conventional vacuum drying equipment uses steam for heating, which needs to be heated from the inside to the outside. The heating speed is slow and requires a lot of coal. While microwave vacuum drying equipment uses electromagnetic wave heating, which does not need heat transfer medium, and is directly heated to the inside of the object. The heating speed is fast. 1 kW of microwave can heat water at room temperature to 100 ℃ in minutes, The above shortcomings are avoided, so the speed is fast, the efficiency is high, the drying cycle is greatly shortened, and the energy consumption is reduced. Compared with conventional drying technology, the work efficiency can be increased by more than four times

2. Uniform heating

due to microwave heating, the material is heated from inside to outside at the same time, and the internal and external temperature difference of the material is very small, which will not produce the inconsistent internal and external heating condition that usually occurs in the heating of the basic test gauge by the standard electric motor electronic tensile testing machine, so as to produce the expansion effect, which is conducive to crushing and greatly improve the drying quality

3. Easy to control, convenient for continuous production and automation. Because the microwave power can be adjusted quickly and has no inertia, it is easy to control immediately, and the temperature can be adjusted arbitrarily between 40 ℃ -100 ℃

4. Small size, convenient installation and maintenance

5. Good product quality. Compared with conventional methods, the quality of processed products has been greatly improved

6. Microwave has the efficacy of disinfection and sterilization, and the product is safe and hygienic. Long shelf life

7. Significant economic benefits

from the features introduced above, we can see the remarkable economic and social benefits from the aspects of energy saving, consumption reduction, improving product quality, safety and health, and low equipment investment cost

III. basic structure and working principle

1. Flow chart of the application of microwave vacuum drying equipment in the processing of precious medicinal materials (omitted)

IV. circuit control design

1. Circuit composition block diagram (omitted)

v. system design

1. Vacuum pump selection

2. Material turntable design

3. Heat balance design of the whole machine

4. Power regulation design. Application of microwave low temperature vacuum drying equipment in the pharmaceutical industry I Overview

microwave vacuum drying equipment is a new type of microwave energy application equipment combining microwave energy technology and vacuum technology. It combines a series of advantages of microwave and vacuum drying, overcomes the disadvantages of long cycle and low efficiency of conventional vacuum drying, and can improve the work efficiency by 4 ~ 10 times compared with conventional methods in the drying process of general materials. With the advantages of high drying output, good quality and low processing cost, microwave vacuum drying equipment is a high-tech product integrating electronics, vacuum, mechanics, thermodynamics, program control and other disciplines. It is a new technology and process developed on the basis of in-depth research on physical changes of substances, internal and external heat and mass exchange and water migration process under vacuum conditions in the drying process. In large-scale industrial production, many items cannot be dried under high temperature conditions, such as some drugs, chemicals, nutritious foods, and high-end Chinese herbal medicines such as ginseng and pilose antler. In order to ensure product quality, the drying treatment must be carried out under the condition of less than 100 ℃ or room temperature. It is well known that the pressure is reduced, and the boiling point of water is also reduced. For example, under an atmospheric pressure (101.3kPa), the boiling point of water is 100 ℃, At 0.073 atmospheric pressure (7.37kpa), the boiling point of water is 40 ℃. Under vacuum conditions, heating the object can make the water inside the object evaporate without heating up. Because it is difficult to conduct air convection heat transfer under vacuum conditions, only by means of heat conduction to provide heat energy for materials. Conventional vacuum drying methods have slow heat transfer speed, low efficiency, and difficult temperature control. Microwave heating is a kind of radiation heating in which PDA (DHI unit) is displayed as orange. It is the direct action of microwave and material, so that it can be heated inside and outside at the same time, without transferring heat through convection or conduction. Therefore, it has fast heating speed, high drying efficiency and easy temperature control

foreign developed countries began to develop industrialized microwave vacuum drying equipment in the 1980s, and achieved good results in practical application. France international microwave company uses microwave vacuum drying equipment to process seedless raisins. The traditional process of 65 ℃, 24-hour hot air drying is changed to 50 ℃, 5-hour microwave vacuum drying. The product quality and output are greatly improved. In the late 1990s, our company took the lead in the research and development of microwave vacuum equipment in China. Through several years of efforts, we completed the development of industrialized 10kW microwave vacuum drying equipment in 2000. It provides a new and efficient drying equipment for pharmaceutical engineering, biological engineering, chemical engineering, material engineering and deep processing of agricultural and sideline products

II. Advantages of microwave vacuum drying equipment

1. High efficiency

conventional vacuum drying equipment uses steam for heating, which needs to be heated from the inside to the outside. The heating speed is slow and requires a lot of coal. While microwave vacuum drying equipment uses electromagnetic wave heating, which does not need heat transfer medium, and is directly heated to the inside of the object. The heating speed is fast. 1 kW of microwave can heat water at room temperature to 100 ℃ in minutes, The above shortcomings are avoided, so the speed is fast, the efficiency is high, the drying cycle is greatly shortened, and the energy consumption is reduced. Compared with the conventional drying technique of about 40 liters, it can improve the work efficiency by more than four times

2. Uniform heating

due to microwave heating, the material is heated from inside to outside at the same time, and the internal and external temperature difference of the material is very small, which will not produce the inconsistent internal and external heating in the conventional heating, so as to produce the expansion effect, which is conducive to crushing and greatly improve the drying quality

3. Easy to control, convenient for continuous production and automation. Because the microwave power can be adjusted quickly and has no inertia, it is easy to control immediately, and the temperature can be adjusted arbitrarily between 40 ℃ -100 ℃

4. Small size, convenient installation and maintenance

5. Good product quality. Compared with conventional methods, the quality of processed products has been greatly improved

6. Microwave has the efficacy of disinfection and sterilization, and the product is safe and hygienic. Long shelf life

7. Significant economic benefits

from the features introduced above, we can see the remarkable economic and social benefits from the aspects of energy saving, consumption reduction, improving product quality, safety and health, and low equipment investment cost

III. basic structure and working principle

1. Flow chart of the application of microwave vacuum drying equipment in the processing of precious medicinal materials (omitted)

IV. circuit control design

1, circuit composition block diagram (omitted)

v. system design

1, vacuum pump selection

2, material turntable design

3, whole machine heat balance design

4, power regulation design