Selection and Rational Arrangement of Grain Dryer

Suitable grain dryer model and size is selected depends on analysis of two important indicators of the local situation and capacity and rainfall range of the grain dryer. For example, 3000t corn of moisture content 26％ with average ambient temperature of －5℃, the corn and be stored about 15 days, keep working 20h per day, and it can be dryed to be moisture of 14％ after 30 days, then the suitable grain dryer is small size and large capacity of 5t/h. If it is in the food concentrated producing area with a large capacity in drying season, it should select the large size , hight temperature and efficiency grain dryer according to the actual situation.

Processing Capacity of Grain Dryer

Selecting large size grain dryer is better than the small size one, because the grain dryer is used only when harvest time is in rainy season, samll productivity and large capacity can not solve the problem. It should select large or middle size dryer to used in nation or local grain depot and the grain concentration producing area. Semidiameter of stationary type dryer is proper small to be huge to reduce the transport distance, reduce cost and increase benefit. Movable type dryer can be used in the countryside or south small grain-producing area which the grain is not concentrated, and the capacity should be 2～5t/h, if it is too small, it will be unpopular, so it should be a machine with multi-purpose, not only can be used in grain, but also commercial crop, the semidiameter should be large then it can work well.

Select Drying Heat Source According to the Local Energy Resources

Consider the local energy resources of using reasonable and reducing cost. Grain producing area with coal mines, the heat source and be coal, blind coal and coke, it is cheap, but hot blast heater with coal need a big investment one time. Grain producing area with oil field and natural gas can use light oil or natural gas and propane as hot blast heater fuel, the use cost is high, but investment is low. Seed dryer equipped with fuel oil or natural gas is better, because the wind-warm syndrome is stable, which is easy to control, and this can ensure the drying seed germination percentage.

Consider Environment Condition to Select Grain Dryer

Due to the harvest time of all kinds of crop and the temperature of south and north is different, drying effect and cost should be considered. coastal areas try to avoid drying grain in low temperature moist weather, or the dehydration and productivity is bad and cost is high. In north area, almost half the time, the drying is under 0℃, the lower the external temperature is, the larger the heat consumption per unit it needs, and cost is higher. For reduce the heat loss, the dryer works under 0℃ should be installed insulating layer on outer wall and hot wind pipeline.

Equipments of Grain Dryer

The drying process should be equipped with some accessory equipments. Continuous system dryer install the upper and lower level indicators (or overflow pipes) on the grain storing part, install full level indicator in temporary storage bin, the elevator shuld be equipped with autostop and blocking warning device, etc. Install a overload protection device with the electrical machine, controlled by manual operation and automatic chain. The discharge outlet can be adjusted with the speed or realize infinitely variable speeds. Temperature controller can show the hot-blast temperature and grain temperatures of each part, and it can alarm when it is in high temperature. Equipped with the fast moisture tester to test the moisture of the grain.