Air-drying machine composition characteristics 
 The air-dryer is a continuous atmospheric dryer. The structure shown in Figure 10-9, is the direct contact with the heating medium to be dry solid food particles, and suspended in the air stream, and the hot air flow, continuous and rapid drying. Air-drying machine can be operating in the positive or negative, depending on the location of the fan in the system arrangement 

 Characteristics of the air-dryer 
 (1) As a result of higher air flow rate (20-40m / s), the solid particles in the gas stream highly dispersed in suspension, gas-solid heat and mass transfer between the surface area is greatly increased, the volumetric heat transfer coefficient increased . 
 (2) air drying using gas-solid two-phase flow operation, so that you can use the high temperature thermal medium drying, air drying tube length is generally 10-20m tube gas velocity of 20-40m / s, therefore, the wet material The drying time is only 0.5-2s, drying time is very short, large capacity, high thermal efficiency. 
 (3) The structure is simple, compact, small size, easy to operate. 
 (4) the flow resistance of the air-dryer system down the larger, generally for the 3000-4000Pa, you must use high pressure or medium pressure fan. 

 DWP type to wear a flow loop with dryer composed by a number of the drying unit and a cooling unit, each of the drying unit segment including circulating fans, heating devices, the new air replenishment system, the share of emissions and exhaust reuse system. Process is as follows: the materials before the procedure later, into the feeding stage, the hopper by a conveyor belt into the dryer, after symmetry device uniform material, mesh belt running speed is adjustable; cold new wind supplement into the mouth of the centrifugal fan, heated by finned heat exchanger (or a mix of high-temperature hot air and hot stove), into the dryer through the material layer by the special structure of speed, full contact with the wet material, heat and mass transfer, materials within the water evaporated into water vapor and hot air away a part of the wet air from the humidity and the mouth emptying, the other part into the circulation; due to the moisture content of the material in each unit, each units of the humidity and the amount of circulating air ratio; throughout the drying process, hot air humidity are not the same; the beginning of drying materials higher moisture content may make use of high hot air temperature; drying the material of the late The low moisture content, can be used to lower the air temperature, greatly improving the drying efficiency. 

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