The combination dryer is a combination of two or more drying forms. For materials, the main one is the series connection, that is, the materials are passed through two or more dryers one after another. The combination drying is mainly to meet certain drying conditions. Process needs. As we all know, each type of dryer has certain deficiencies. Working in tandem or two or more models in series, using their respective advantages, often results in a single device that cannot be achieved.
Recently, a combination of different drying methods and different drying principles has been widely used, and drying devices that can make use of their respective advantages to make up for their respective disadvantages. For example, direct drying is combined with indirect drying, and indirect drying is used to provide most of the heat required for drying. In this way, it is possible to increase the drying rate and obtain a drying apparatus using a combination of a direct and indirect drying method with a small volume and a high thermal efficiency.
Combined dryers are also used more and more widely, such as the combination of spray dryers and vibrating fluidized bed dryers, combination of rake dryers and vibrating fluidized bed dryers, rotary stirring dryers, conductive stirring dryers, air flow The dryer is combined with a fluidized bed dryer to achieve lower moisture. Single spray dryers can be used to obtain products with 1% to 3% moisture content. If the moisture content is required to be below 0.3%, the exhaust temperature often needs to be above 120°C and the heat loss is very high. Similarly, if the moisture content is further required, and the moisture content is less than 0.1%, the exhaust gas temperature is required to be 130°C or higher. In order to save thermal energy, in the design, spray dryer with exhaust temperature of 90°C is generally used to make the moisture reach 2%, and 60°C hot air generated by heat recovery can be used in a horizontal fluidized bed dryer in series, and the final moisture can be To reach 0.1% or less, and thermal energy can save 20%.
Recently, a combination of different drying methods and different drying principles has been widely used, and drying devices that can make use of their respective advantages to make up for their respective disadvantages. For example, direct drying is combined with indirect drying, and indirect drying is used to provide most of the heat required for drying. In this way, it is possible to increase the drying rate and obtain a drying apparatus using a combination of a direct and indirect drying method with a small volume and a high thermal efficiency.
Combined dryers are also used more and more widely, such as the combination of spray dryers and vibrating fluidized bed dryers, combination of rake dryers and vibrating fluidized bed dryers, rotary stirring dryers, conductive stirring dryers, air flow The dryer is combined with a fluidized bed dryer to achieve lower moisture. Single spray dryers can be used to obtain products with 1% to 3% moisture content. If the moisture content is required to be below 0.3%, the exhaust temperature often needs to be above 120°C and the heat loss is very high. Similarly, if the moisture content is further required, and the moisture content is less than 0.1%, the exhaust gas temperature is required to be 130°C or higher. In order to save thermal energy, in the design, spray dryer with exhaust temperature of 90°C is generally used to make the moisture reach 2%, and 60°C hot air generated by heat recovery can be used in a horizontal fluidized bed dryer in series, and the final moisture can be To reach 0.1% or less, and thermal energy can save 20%.
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