The importance of Desiccant, you know?
For people who eat a lot of snacks, a small paper bag found in the food bag is often, it feels like a grain of sand, and yes, it is a Desiccant. Desiccant is a kind of absorbent, it is used in moisture-proof, mildew, drying effect, according to the adsorption mode and the reaction products are different for the adsorption Desiccant and chemical adsorption Desiccant. Physical adsorption of Desiccant silica gel Desiccant, Desiccant, molecular sieve Desiccant, activated carbon, alumina gel bone charcoal, charcoal, mineral Desiccant, or activated clay, lime Desiccant, etc., and its drying principle is to ship by physical adsorption of water molecules in the structure itself. After drying up, keep drying.
Drying is an important and versatile operation in many industrial fields. The drying of materials is often due to one or more of the following reasons: to make the materials liquid, easy to load and unload, easy to preserve and store, reduce the transportation cost, and obtain the product quality of the hope. Need the variety of drying, they need the drying time of each different, each have different physical shape and quality requirements, improper drying can lead to poor product quality, product sale, cause irreparable damage.
According to relevant literature, there are more than 400 models of drier, of which there are more than 100 kinds. Because of high vaporization latent heat and low efficiency due to hot air as the drying medium (the most common), drying becomes a high-energy unit operation that can be compared with distillation. According to the survey, in the United States, Canada, France and the UK, industrial dry energy consumption accounts for 10% to 15% of the total energy consumption in China, while in Denmark and Germany it is as high as 20% ~ 25%. (the latter comes from the industry's mandatory energy audit, which makes it more reliable.) Such high energy consumption is the result of the widespread application of dry operation in various sectors of the national economy. The amount of energy needed during the process of drying usually come from the combustion of fossil fuels, and may cause harm to the environment, as the global economic boom, drying the required energy consumption will also increase, the contradiction between dry and environment will be more and more obvious. Therefore, in order to ensure that the market economy is restricted, efforts should be made to improve the drying process and minimize the drying energy consumption.
Dry technical innovation means that at least one or more of its properties can replace the original product, operation or method: the product or method that was not previously manufactured or invented; Higher productivity than existing technologies; Better quality control and better quality control. Reducing the environmental footprint of equipment; Operate more safely; More efficient; The total cost is lower. The new technology can be a new type of product, such as microwave drying, dielectric drying, etc. Also can be the moderate improvement of existing products and processes, such as: jet impact drying, cyclone drying, etc. It is also a major improvement on existing technologies, such as: organic superheated steam drying, Desiccant drying, etc.
Drying of Desiccant is contact with adsorption drying, and its drying principle is based on the wet transfer between the dry material and the solid that can adsorb the wet part in direct contact. The dry form contains two types of drying techniques. One is a typical contact dryness: the evaporation of the wet part is at the cost of heat transfer from a hot solid surface. The second is adsorption drying: the moisture transfer here is driven by a gradient of mass concentration. Due to the different interaction between the materials and the adsorbent, the adsorption drying can be divided into two categories: inert adsorbent drying and active adsorption drying. Inert adsorbent is a solid material that does not form the final product and is separated after the drying process is completed. The active adsorbent can be an integral part of the final product and do not need to be separated after drying. Due to the addition of Desiccant, the drying technology of Desiccant is better than the conventional convection drying, which has good quality, uniform quality and easy to maintain biological activity. Short drying time; Low operating cost, relatively small system, relatively small equipment and low investment in civil engineering. Especially suitable for the needs of small, portable, or relative shortage of power users, is a kind of very promising drying technology, which can be widely used in chemical industry, food, medicine, textile, biological and other industries.
According to the application environment, there are generally three situations:
(1) use in a small environment: the Desiccant is placed directly in bottles, cans or other sealed small pockets to keep the items in the small environment dry.
(2) use in the medium environment: the Desiccant is directly placed in the carton (or packing bucket and bag) to avoid moisture in the packaging.
(3) use in the environment: the Desiccant is directly used in similar warehouses and containers to achieve the purpose of controlling the environmental humidity.