5HL series grain dryer I. Overview: grain dryer according to the Food and airflow direction of relative movement can be divided into cross-flow, Francis, downstream, upstream and along reflux, mixed reflux, along Francis and other types. Optimum drying parameters of advanced technology the company now produces 5HL series along countercurrent mixing countercurrent Heshun Francis grain dryer, drying in the digestion and absorption of foreign technology, based on the use of grain drying mathematical modeling computer design drawn model, is downstream, upstream, Francis dryer respective advantages, to achieve high-temperature rapid drying, increase drying capacity, without increasing the heat consumption, to ensure a uniform grain quality and moisture content. Mainly applied to grain, farm, seed and feed, ethanol and other enterprises, high-moisture grain drying process. It was a variety of crops (corn, rice, wheat, soybean, etc.) for the production of continuous drying operation. It consists of grain unloading, lifting, cleaning, transportation, warehouse before baking, drying tower, drying after the warehouse, heat, electrical and control units can be outdoor installation, also can be installed in a factory building. Second, characteristics: 1, good drying grain quality, low cost. In countercurrent along grain dryer, grain drying medium first contact with cold wet, to flow in the same direction, which not only makes full use of high-temperature hot air, and so that each grain drying process can get the same temperature, the grain itself the maximum heating temperature is below 55 ℃, after each drying section, with a tempering process, so that the grain before the next dry grain center to the surface of the water content and temperature, become more balanced in favor of the next stage dried and baked to ensure food quality. 2, precipitation amplitude, thanks to the multi-stage drying process in a precipitation rate can be as high as 15-18%. 3, saving significant, proven drying compared to other models, energy savings of 20-25%. 4 adapt to a wide range of convenient combination, according to different grain precipitation, set different precipitation and drying sections meet production requirements. ? 5, high degree of automation with stepless adjustment row of grain, with a monitoring system that automatically adjusts the hot air, simple and reliable. Third, the structure and process: Heat part of the equipment can be divided into hand burn, automatic stove, the combustion chamber and heat exchanger manufacture is divided into two bodies, can be stacked off the installation or division installed according to the heating capacity of the heat exchanger part metal, use a combination of tubes and plate heat exchangers, flue gas heat exchangers and air running multiple backhaul, smoke, wind prevails, access to clean hot air for drying crops, the smoke air temperature controller to adjust the combustion state and heat than the column, in order to ensure air temperature stable, uniform drying, the grain pollution. Send dryer all-metal structure, from top to bottom lined with stored grain, dried, tempering, change direction, and then drying, cooling, exhaust and other food segments, hot air from the plenum into the middle column, the air distribution is evenly distributed to each corner into the wind box, the grain layer heat and mass transfer and then discharged from the grain discharge means tower. Discharge tidal mouth with a metal shutters to atmospheric discharge of exhaust gas stream flows. Heat exchangers, air drying tower and heating pipes are manufactured as double metal shell, sandwiching a flame-resistant cotton insulation, in order to improve the drying effect of the wind, the smoke pipe has wind, smoke temperature controller to adjust working condition fan, hood, adjust hot air temperature, flow rate, total pressure parameters to ensure that the desired operation of the drying operation. Cited hood arranged at the lower exhaust port at the smoke box, so that a negative pressure in the smoke path heat exchanger, and a blower arranged at the front of the heat exchanger inlet, the air pressure state is formed in the heat exchanger to ensure pure hot air. The device is provided with heat recovery and dust chimney, in order to improve the thermal efficiency and reduce exhaust smoke content, and meet the national emission standards. The device uses the following process: cleaning shoe - the food - stored grain - drying - tempering - commutation - drying - tempering - drying - tempering - Cooling - grain discharge