A spray dryer is a device that can simultaneously perform drying and granulation. According to the process requirements, the pressure, flow rate and orifice size of the liquid pump can be adjusted to obtain the desired spherical particles in a certain proportion. Then, the author will briefly introduce the common types of spray dryers: centrifugal spray dryer, pressure spray dryer, airflow spray dryer, spray dryer for traditional Chinese medicine extract.
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Centrifugal spray dryer is a widely used process in the liquid process forming and drying industry. It is mainly used to spray and dry materials such as solutions, emulsions, suspensions, pastes and traditional Chinese medicine extracts into powdery and granular solid products. It has the advantages of high speed, high efficiency and few processes. The heat sensitive material can maintain its color and fragrance, and the powder has good solubility and high purity. The spray dryer can be widely used in chemical, petrochemical, light industry, food, medicine, building materials, ceramics, forestry and chemical industries. 
The pressure spray dryer feeds the liquid (filtered liquid) into a pressure atomizer by high pressure to atomize into small droplets. After atomization, the droplets (large surface area) are fully contacted with hot air to complete quickly. The drying process results in a finished product of powder or fine particles. The drying speed of the series of dryers is fast, and the surface area of ​​the liquid is greatly increased after atomization. In the hot air flow, 95%-98% of the water can be evaporated in an instant, and the drying time takes only ten to several tens of seconds. It is especially suitable for the drying of heat sensitive materials. All products are spherical particles with uniform particle size, good fluidity, good solubility, high purity and good quality. 
The airflow spray dryer blows compressed air or water vapor from the nozzle at a speed of ≥300 m/s, and the frictional force generated by the difference in speed between the gas and the liquid separates the liquid material into fine droplets. The droplets are in full contact with the hot air and exchange heat, and the entire drying process is quickly completed in 10-30 seconds. Therefore, the industry also known as airflow spray dryer is an instant dryer, especially suitable for solutions, emulsions, pastes, suspensions and even sticky materials, mainly used in chemical, food, dairy, building materials industries, such as latex. , dyes, resins, maltose, dextrin, starch, etc. 
The special spray dryer for traditional Chinese medicine extract is the application of centrifugal spray drying technology in the drying of specific materials. It also uses high-speed centrifugal atomizer to disperse the material into fine powder, fully contact with hot air, and complete instant drying to form powdered finished product. Drying device. The drying device is a spray dryer specially designed to solve the problem of drying the Chinese medicine extract and the plant extract, and the machine can effectively solve the problems of the original LPG series high-speed centrifugal spray dryer in the drying of the traditional Chinese medicine extract. The machine is fully enclosed, all parts are made of stainless steel, equipped with a three-stage purification device, and the filtered air can reach the requirements of 100,000. The cylinder and the top are equipped with a cold wall device to make the wall temperature <80 ° C, and there is an air sweeping device in the drying tower. The traditional Chinese medicine extract powder dried by the machine will not cause coking and deterioration, which greatly increases the yield (more than 95%), and can avoid mixed drug pollution and sticking. 
So what about the advantages of the AHD Four in One CCTV Kit?
AHD Four in One CCTV Kit is the combination of the AHD Four in One Cameras and the Digital Video Recorder. Let me introduce you the 2 parts respectively.
The AHD Four in One Camera, also called the Analog High Definition Camera, one type of the analog camera, contains 4 video formats, and they are AHD,TVI,CVI,and CVBS respectively. The AHD Four in One Camera can transmit the ultra-long distant (500 meters) high-definition analog signal(resolution above 720P is High Definition, also called the HD ) via the ordinary video cable or the 75-5 coaxial cable.The AHD Four in One Camera adopts the advanced Y/C signal separation and analog filtering technology, which can effectively reduce color noise in the high-frequency area and improve the image restoration. Besides, compared with the traditional analog high-definition camera, the image resolution of the AHD Four in One Camera has a great improvement and the highest definition can reach up to the equal level to the network HD 1080P.
The Digital Video Recorder, also called the DVR, is the video storage device(a computer system for image storage and processing) via the hard disk recording. The Digital Video Recorder has the functions of long-term image recording, voice recording, remote monitoring and control of images/voices. In terms of the image processing, image storage, retrieval, backup, network transmission, and remote control, the Digital Video Recorder is the far superior to the analog monitoring equipment because of the adoption of the digital recording technology.
The Digital Video Recorder represents the developing direction of the TV monitoring system, and it is also the first choice for the TV monitoring system in this market.
What about the disadvantages for the AHD Four in One CCTV kit?
The AHD Four in One CCTV Kit is wired and it is not so convienient as the Wireless CCTV Kit in some applications, but the AHD Four in One CCTV Kit is stable and cheap in some degree.
Therefore, we should choose the suitable CCTV Kit according to our demand.