It is known that the spray dryer sprays the liquid into a mist by a special device, and is dried in contact with hot air. It should be noted that the liquid liquid is sprayed into a very fine misty liquid bead through the high-speed centrifugal atomizer at the top of the equipment, and can be dried into a finished product in a short time by cocurrent contact with hot air. Due to the short contact time and fast drying, it will not damage the nutrients in the material and ensure the drying quality, especially suitable for heat sensitive materials.
In addition, compared with the traditional drying equipment, because the spray dryer can adjust the pressure, flow rate and orifice size of the liquid pump according to the process requirements, the spherical particles with a certain proportion can be obtained to ensure the size of the finished material. Uniform, uniform specifications, for users to have a significant flexibility in the production of products, operability. At the same time, the particle size of the material can be accurately controlled, and an average particle size of 30 to 500 microns can usually be produced, which is distributed in a bell shape.
Nowadays, with the rapid development of food drying technology, the drying equipment manufacturer has introduced a combined spray dryer, which has the same function as the spray dryer. Its drying speed is fast, the surface area of ​​the liquid after atomization is greatly increased, and the hot air flow In the middle, it can quickly evaporate more than 95% of the water, and usually the drying time can be completed within 1 minute.
In addition, the spray-dried product of the machine has good uniformity, solubility and fluidity, and the product has high purity and good quality, and meets the high quality requirements for spray drying. Not only that, it is well known that many heat sensitive materials are particularly sensitive to temperature. As long as the temperature is slightly higher and the heating time is prolonged, the material is prone to burnt smell, which directly affects the flavor and quality of the product.
The combined spray dryer, because of the heat transfer and mass transfer during drying, occurs in the air and vapor film around the droplets, which keeps the particles at a saturated, even temperature, so that it does not affect the drying quality of the material. , so as to better avoid the product smell.
In addition, some enterprises have developed intelligent high-speed centrifugal spray drying equipment, using high-speed centrifugal technology, spray drying is faster, can well meet the dry granulation of liquid materials with higher solid content, can also be used for viscosity, Spray drying and granulation of oily, heat sensitive and moisture repellent materials meet high standards of safety and hygiene. However, it is worth noting that * good to maintain the hygiene of the spray drying environment, can avoid air pollution in the production environment, affecting the quality of spray drying.
At present, with the increasing awareness of people's safety, the quality and safety requirements of food are improved. The spray drying equipment plays an important role in ensuring the drying and granulation quality of the products, and is more and more widely used and diversified. With the rapid development of science and technology, the comprehensive performance of spray dryers should be upgraded and developed, or combined with other technologies, such as advanced technologies such as ultrasonic and microwave, which not only can save energy and protect the environment, but also improve the quality of products. . This may be the research direction for the improvement and upgrade of spray drying equipment in the future.
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