重庆时时彩有人控制吗|重庆时时彩的规律

冻干机英文文献和中文翻译

时间:2017-12-07 21:31来源:毕业论文
Introduction of Vacuum Freeze Drying Machine The characteristics and the developing situation at home and abroad of freeze-drying food were introduced. The main problems related to development of freeze-drying food in China were analyzed dee
Introduction of Vacuum Freeze Drying Machine
The characteristics and the developing situation at home and abroad of freeze-drying food were introduced. The main problems related to development of freeze-drying food in China were analyzed deeply, the countermeasure for freeze-drying food in China was given.16322
The mechanism of the vacuum freeze-drying, the basic structure of vacuum freeze driers and their applications in the food industry were reviewed; the current status and the future development trend of the vacuum freeze drying equipment were projected.
LGJ - 25 froze n - dryer assembles two functions of pre - freeze and freeze - drying. The chamber selects the structure of the bell glass. The shelves are heated by electricity. In this paper, the technical data, the design and selection of the parts ,and the experimental results of the instrument are presented.
The following properties of the vapor condenser used in vacuum freezing dryer system that were interior structure, placed position and the vapor condensation characteristic were introduced. Secondly, the design method of the tube vapor condenser outside the dryer whose tubes were placed in rows was given. Finally we discussed the process and condition of icing or frosting in the condenser, and expound its advantage and shortcoming separately.
An experimental study on the performance of freeze – dryer’s cold trap has been carried out under different temperature of the cold trap coil and different frost thickness in the paper. Research results reveal that the capture efficiency of cold trap increases with the decrease of the temperature of cold trap coil, and the overall heat transfer coefficient of the cold trap decreases with the increase of frost accumulation on the surface of the cold trap coil. A theoretical analysis on the convection heat transfer in the cold trap shows that the convection heat transfer decreases with the increase of the degree of vacuum , and the convective heat transfer needn’t to be considered when the fluid in the cold trap is in the state of free - molecule flow. 本文来源:http://www.mamitama.com/a/www.qiusuo.net.cn/

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In accordance with widespread application of vacuum freezing and drying unit, the method to determine refrigerating capacity of the plant is discussed in this paper. It is suggested that for common freezing and drying food the reasonable evaporation temperature of the plant should be between - 35 ℃and - 40 ℃. The most suitable refrigerants , so far , are R717 and R22 , and the optimal refrigeration units are single-stage or two-stage compression condersing unit, or screw compressor unit with economizer. The result s above can provide a basis for engineering design.
A control system for a freeze drier based on PC and PLC is introduced , emphasizing on the design and implementation of the computer monitoring and control software. The techniques of multithreading and a self-made module of communication class were adopted in the program, the feasibility of the system was proved in its applications.
This Paper mainly introduces the design and choose type of measurement and control for vacuum freeze drying. On the basis of formation of freeze drying curve, expounds emphatically measurement and control for temperature and variety and eutectic point, and analysis of influence, thereby for freeze drying produce design scheme and example of optimum freeze drying rate.
The hardware formation and software design of manual automatic control system composed of OMRON PLCöC 40P and 8032öEU 818P15 are introduced. They are used in ZLG230 Vacuum -Freeze Drying Equipment etc. which is applied to many fields such as astronavigation, military affairs, medicine and nutritive health foods. In accordance with various technological requirements of different materials to be processed, two self-adaptive and self turning methods which are DRA algorithm and critical proportion method have been adopted to solve the temperature-time-delay problem of the plan t. Then the stable and reliable automatic freezing and drying process can be realized. 冻干机英文文献和中文翻译:/a/fanyi/20171207/17613.html
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