新闻资讯
Grain dryer is an assembly of dryers
Release time:
2024-12-26
According to the relative movement direction of grains and airflow, dryers can be divided into cross-flow, mixed flow, downstream, counter-flow, downstream and counter-flow, mixed counter-flow, downstream and mixed flow, etc.
According to the relative movement direction of grains and airflow, dryers can be divided into cross-flow, mixed flow, downstream, counter-flow, downstream and counter-flow, mixed counter-flow, downstream and mixed flow, etc.
1. Cross-flow dryer
Cross-flow dryer is a type of machine introduced in my country, mostly cylindrical sieve hole type or square tower sieve hole type structure, and many manufacturers still produce it in China.
The advantages of this machine are: simple manufacturing process, convenient installation, low cost and high productivity. The disadvantages are: poor uniformity of grain drying, high unit heat consumption, limited drying of multiple grains by one machine, difficult to meet the quality requirements of some grains after drying, and frequent cleaning of internal and external sieve holes. However, small-scale circulating dryers can avoid some of the above shortcomings.
2. Mixed flow dryer
Mixed flow dryers are mostly tower structures composed of triangular or pentagonal boxes arranged in a staggered (fork) manner. There are more domestic manufacturers of this type of machine than cross-flow dryers. Compared with cross-flow dryers, its advantages are: (1) the hot air supply is uniform, and the moisture content of the grain after drying is relatively uniform; (2) the unit heat consumption is 5% to 15% lower; (3) the fan power required under the same conditions is small, and the unit consumption of the drying medium is also small; (4) it can dry a wide variety of grains, and can dry both grains and seeds; (5) it is easy to clean and not easy to mix seeds.
Disadvantages are: (1) the structure is complex, and the manufacturing cost is slightly higher under the same productivity conditions; (2) a small part of the grain at the four corners of the dryer precipitates slowly.
3. Downstream dryer
Downstream dryers are mostly tower structures that combine funnel-type air inlets with angular box exhaust ducts. Unlike mixed-flow dryers, which are supplied with hot air by one main air duct, they are supplied with different or partially identical hot air by multiple (level) hot air ducts.
The number of domestic manufacturers is less than that of mixed flow dryers. Their advantages are: (1) high hot air temperature, generally the temperature of the first high temperature section can reach 150-250℃; (2) low unit heat consumption, which can ensure the quality of grain after drying; (3) three-stage co-current dryers have the advantage of reducing moisture and can achieve higher productivity; (4) the moisture reduction range is large during continuous drying, generally up to 10%-15%; (5) suitable for drying grain crops and seeds with high moisture content.
The disadvantages are: (1) the structure is relatively complex, and the manufacturing cost is close to or slightly higher than that of mixed flow dryers; (2) the thickness of the grain layer is large, the required high-pressure fan power is large, and the price is high.
4. Co-current and counter-current, mixed counter-current and co-current mixed flow dryers
Pure counter-current dryers are rarely produced and used. Most of them are used in conjunction with dryers of other airflows, that is, used in the cooling section of co-current or mixed flow dryers to form co-current and counter-current and mixed counter-current dryers. The advantage of countercurrent cooling is that the natural cold air can fully contact the grain, which can increase the cooling speed and appropriately reduce the height of the cooling section. The countercurrent, mixed countercurrent and countercurrent and mixed current dryers respectively utilize their own advantages to achieve high-temperature and rapid drying, improve drying capacity, do not increase unit heat consumption, and ensure uniform grain quality and moisture content.
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