What are the energy-saving methods of hot air circulating oven at present?

There are three energy-saving methods of hot-air circulation oven :

1. Increasing the air temperature at the entrance of hot-air circulation oven and reducing the exhaust temperature at the exit of drying equipment are helpful to improve the thermal efficiency of oven by increasing the air temperature at the entrance of drying equipment due to the common knowledge of oven thermal efficiency. However, the inlet air temperature is limited by the allowable temperature of the product. In a cocurrent oven, the surface temperature of particles is relatively low, so the air temperature at the entrance of the drying equipment can be much higher than the permissible temperature of the product. Reduce all kinds of heat loss in drying process: Generally speaking, the heat loss of hot air circulating oven will not exceed 10%, and the heat loss of large and medium-sized production equipment will be about 5% if the heat preservation is appropriate. Therefore, to do a good job of thermal insulation in drying system, but it is not that the thicker the insulation layer, the better, we should determine an optimal thickness of the insulation layer. In order to prevent the leakage of drying system, the series use of air supply fan and induced draft fan is generally adopted, and the system is operated at zero pressure state after reasonable adjustment, so as to avoid the decrease of the thermal efficiency of the oven caused by the leakage of drying medium or the leakage of ambient air in the hot air circulation oven. Reducing evaporation load of hot air circulating oven before entering the oven, pre-dewatering treatment such as filtration, centrifugal separation or evaporator can increase the solid content of the material and reduce the evaporation load of the oven, which is one of the most effective ways to save energy of the drying equipment. Applicable materials: bamboo shoots, mushrooms, mushrooms, chicken leg mushrooms, abalone mushrooms, Flammulina velutipes, tremella, agaric, chili, okra, pepper, pepper, dried tofu, bean curd, eggplant, garlic slices, potato chips, yellow cauliflower and other vegetables; rose, honeysuckle, hawthorn slices, lemon slices, kiwifruit slices, ginseng, ginseng, wolfberry, yam, pilose antler, ginseng, silver, etc. Forsythia, Isatis, Ganoderma lucidum, Snow Lotus and other traditional Chinese medicines; kelp, laver, dried fish, shrimp, squid, sea cucumber, abalone and other marine products; walnut, hazelnut, Padan wood, pine, jujube, cashew nut, raisin, melon seeds and other dried fruits.