UTZ Freeze dried coffee: also known as Freeze-dried Coffee, it is an Instant Coffee made by freezing liquid products and removing ice through sublimation.
The freeze-dried coffee chips retain the original flavor of coffee well. Due to its loose and porous internal structure and fast dissolution rate, it is a "instant coffee" that is convenient to measure and can easily control the concentration of the beverage.
Bulk Freeze Dried Coffee,Freeze Dried Coffee Brands,Freeze Dried Soluble Coffee,Freeze Dried Instant Coffee Brands Yunnan New Biology Culture Co,.Ltd , https://www.lvsancoffee.com
1 The basic theory of evaporation According to the molecular kinematics theory, when the solution is heated, the kinetic energy obtained by the molecules near the heating surface outweighs the attraction between the molecules, so the escape to the liquid surface becomes a free molecule, which is called gas. Turn. The steam generated by the gasification will not gradually be removed after the escape space, and the vapor and the solution will gradually become in equilibrium, so that the gasification cannot be continued. Therefore, the necessary condition for evaporation is the continuous supply of heat and the elimination of the generated steam.
During the evaporation process, the gasification of the solvent in the solution can be divided into gasification at the boiling point and gasification at the lower boiling point, and the rate of the former far exceeds the latter, so industrial evaporation is carried out under boiling conditions. Evaporation of the solvent under boiling conditions still requires continuous supply of thermal energy. The amount of heat required to evaporate a unit weight of solvent is called latent heat of vaporization (or latent heat of vaporization). If it is an aqueous solution, the solvent is water. The heat source used in the industry is usually water vapor, so when the evaporation of the aqueous solution is encountered, steam is used as a heat source to supply heat energy on the one hand; on the other hand, steam is also generated when the aqueous solution itself evaporates, which is called heating steam for easy distinction. The latter is called secondary steam.
2 Chinese medicine evaporation concentration equipment evaporation equipment is the basis for the evaporation operation. With the needs and development of industry, the form of evaporator construction has also gradually improved. Firstly, the jacket heating type was replaced by a horizontal tube heating type, and then the vertical tube heating type was improved, and the latter was further improved in widespread use. In order to avoid the influence of the static pressure of the solution, a liquid film evaporator was created, in order to improve The production intensity creates an evaporator and a forced circulation evaporator outside the heating chamber. In addition, the method of saving heating steam can be used as a heating evaporator by using a secondary adiabatic compression to increase the temperature, and can be used again as a heating steam. The evaporator is called a heat pump evaporator. These improvements and creations are based on the basic principles of evaporation and the many factors related to their production intensity.
2.1 The type of evaporation equipment is divided into the shape and position of the heating surface, including jacket, coil, straight tube, heating chamber or outside; according to the placement method of the evaporator itself, there are lying, standing, tilting; The loop method is divided into, there are natural loops, forced loops.
2.2 Evaporation equipment form Figures 1 to 6 show the form of various common evaporators. 
2.3 Requirements for evaporation equipment (1) Try to ensure a large heat transfer coefficient; (2) Be suitable for some characteristics of the solution, such as viscosity, foaming, heat sensitivity, solubility characteristics with temperature and corrosion; (3) It can perfectly separate the liquid foam; (4) minimize the temperature difference loss; (5) minimize the formation rate of the dirt on the heat transfer surface; (6) discharge the crystals precipitated during the evaporation process; (7) Clean the heat transfer surface.
3 Process of Evaporation and Concentration Process of Traditional Chinese Medicine Evaporation process refers to the way in which the number of multi-effect evaporators is extremely combined, the flow of materials and steam, the setting of auxiliary equipment such as preheaters, condensers and vacuum pumps, and for further research. The solution and process used to save steam and make full use of thermal energy to use secondary steam.
Commonly used multi-effect evaporators and their combination methods are: (1) single-effect evaporation, evaporation process using only heated steam (raw steam) for one evaporation and concentration process; (2) double-effect evaporation, evaporation process in addition to utilization In addition to steam, the secondary steam is used for the secondary evaporation and concentration process; (3) multi-effect evaporation, multiple times using secondary steam for multiple evaporation and concentration operations.
3.1 Determination of Evaporation Device Process 3.1.1 Determination of Effectiveness (1) Economic limitation refers to the economical unreasonable after the effect exceeds a certain value.
(2) The technical limitation means that the number of effects is too large, and the evaporation operation will be difficult to carry out. In general, if the boiling point rises, it usually takes 2 to 3 effects, and if the boiling point rises less, it can take 4 to 6 effects. But the choice to the true adaptation of the effect, you also need to be determined by the zui optimization method.
3.1.2 Selection of solution flow in multi-effect evaporation device In the multi-effect evaporation device, the flow of the solution may be cocurrent, countercurrent and flat flow, and the selection of the process is mainly determined according to the characteristics of the solution, the operation mode and the economic degree.
3.2 Process group of evaporation and concentration process The process composition of the evaporation concentration process should be determined according to the requirements of the process and product and the characteristics of the material. Usually there are the following combinations: (1) single-effect evaporation of external circulation; (2) Double-cycle or three-cycle multi-effect evaporation; (3) double-effect evaporation of the falling film, as shown in Figure 7; (4) double-film double-effect evaporation, as shown in Figure 8; (5) one drop and two liters Evaporation; (6) three falling film three-effect evaporation. 
4 The energy-saving evaporation process during evaporation is also a heat balance process. Theoretically, 1L of water vapor is consumed to evaporate 1L of water, but in actual operation, there is considerable heat energy due to steam transport and heat transfer resistance of the equipment itself. Loss, the actual amount of steam consumed to evaporate 1L of water is much greater than the amount of steam of 1L. Therefore, how to save energy in the evaporation process, in addition to reducing the energy loss of the process, is mainly to improve the heat transfer effect of the heat exchange equipment and fully consider the rational use of secondary steam in the process.
4.1 Energy-saving measures that can be considered (1) Improve the manufacturing process of evaporation equipment: Consider improving the welding or other processing of thin-walled pipe fittings.
(2) Select high-efficiency heating equipment: Plate heat exchangers or other high-efficiency heaters can be considered as heating elements for evaporation operation.
(3) Improve evaporation process and operation, fully and effectively utilize heating steam and secondary steam: rationally select evaporation equipment and process assembly, try to improve the efficiency of secondary steam in process operation (such as using differential pressure operation, both effective Pressure operation, two-effect negative pressure operation; or heat pump equipment in the process, adiabatic compression, increase the temperature of the secondary steam, etc.).
4.2 Improvement of separator (evaporator) and design To achieve good evaporation effect, in addition to considering the use of efficient heating equipment and making full use of secondary steam, the reform of separator (evaporator) is also an important factor to improve evaporation efficiency. In the key aspects, the reform of the separator (evaporator) can be considered from the following two aspects: (1) expanding the distribution and evaporation area of ​​the liquid in the separator; and (2) enhancing the speed and effect of vapor-liquid separation.
5 Conclusion The extraction and concentration process of traditional Chinese medicine is a major energy-consuming person in the production of traditional Chinese medicine. Therefore, understanding the basic theory of evaporation, familiarizing with and mastering the structure and process flow of the evaporation and concentration equipment of traditional Chinese medicine are very important to improve the energy-saving effect of the evaporation process. Measures to improve and improve equipment performance.
Balance,mellow and clean tese
Introduction to the use of Chinese medicine evaporation and concentration process equipment and thermal energy
In the traditional Chinese medicine pharmaceutical industry, the Chinese medicine production process is a large operation process of thermal energy consumption, especially the evaporation and concentration operation process of the extract liquid, and the energy consumption accounts for the majority of the total process consumption. Therefore, the evaporation operation is a key issue for energy conservation work. Evaporation and concentration of traditional Chinese medicine extracts involves the balance and comprehensive utilization of thermal energy, and the energy-saving work involves the renewal, transformation and development of evaporation equipment and evaporation process.