According to the direction of relative motion of the grains and airflow, the dryer can be divided into the cross-flow, mixed flow, downstream, countercurrent and Shun countercurrent mixed the countercurrent Shun Francis type. 

 A cross-flow dryer 
 Cross-flow dryer is our first introduction to a model, mostly cylindrical sieve or square tower type sieve structure, currently there are still many manufacturers. The advantage of the machine: the manufacturing process is simple, easy installation, low cost, and high productivity. The disadvantages are: poor grain drying uniformity, specific heat consumption high, a dryer variety of cereals is limited, after drying of grain quality is more difficult to meet the requirements, the need to frequently clean up inside and outside the sieve. The small circulating dryer above deficiencies can be avoided. 

 2 Francis dryer 
 Francis dryer multi-the staggered triangular or pentagonal box (fork) arrangement consisting of a tower structure. Manufacturers of domestic production of this model than cross flow and cross-flow compared to its advantages are: (1) uniform supply of hot air, more uniform grain moisture content after drying; (2) the unit heat rate from 5% to 15% lower; ( 3) under the same conditions required fan power consumption per unit of drying medium; (4) drying a wide variety of cereals, both drying grain can bake species; (5) easy to clean up and difficult to hybrids. The disadvantages are: (1) The structure is complex, and the manufacturing cost is slightly higher in the same productivity under conditions; dryer at the four corners (2) a small portion of the cereal precipitation Pianman. 

 3. Downstream dryer 
 Downstream dryer funnel inlet and angular box exhaust ports combined tower structure, it is different from the mixed flow dryer consists of a main air pipe heating wind, but by a number of (class) The hot air pipe supplying different or part of the same hot air. Domestic manufacturers less than the number of mixed-flow dryer manufacturers, the advantages are: (1) the use of the hot air temperature is high, the general temperature of a high temperature of up to 150 to 250 ℃; (2) units of heat consumption is low, can guarantee the food after drying quality; (3) more than three downstream dryer has the advantage down great water, and higher productivity; (4) consecutive drying a precipitation rate, usually ranging from 10% to 15% ; (5) the most suitable for drying moisture of the food crops and seeds. The disadvantages are: (1) The structure is more complex, close to or slightly higher than the manufacturing costs Francis dryer; (2) grain thickness required for high pressure air power, high prices. 

 4 Shun countercurrent, mixed the countercurrent Heshun Francis dryer 
 Pure countercurrent dryer production and use of small, it most other airflow dryer with the use, i.e. for the cooling section of the dryer of cocurrent or mixed to form cis countercurrent and mixed countercurrent dryer. The counterflow cooling has the advantage of natural cold to full contact with the grain, can increase the cooling rate, due to lower the height of the cooling section. Shun countercurrent mixed countercurrent Heshun Francis dryer are use of their respective advantages, to achieve high-temperature drying fast, increase drying capacity, without increasing the specific heat consumption, grain quality and uniform moisture content. 

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