The Drying Process of Rice Dryer

Using a rice dryer can achieve excellent drying results, but it is not enough to only know the operating method without understanding the drying process. When equipment problems occur, people need to have rich experience and be familiar with the operation process of the rice dryer in order to quickly identify the root cause of the problem and solve it. Now, let me introduce you to the drying process of a rice dryer.

Before starting up the rice dryer, it needs to be preheated. It is not appropriate to load materials directly after starting up. Wait until part of the cylinder body is preheated by the combustion furnace before loading materials. The drying process of rice in the cylinder can be divided into three stages: high temperature zone, which is where rice enters into the dryer for preliminary drying with high-temperature gas flow; then enters into medium temperature zone, which is where internal lifting plates play a major role in lifting and tumbling rice while high-temperature gas flows through and achieves rapid drying effect; finally enters into low temperature zone, where dried rice is cooled down and water vapor is drawn out by induced draft fan. At this point, the entire drying process of rice is completed.

To ensure the quality of rice after drying and reduce the rate of cracked grains, it is necessary to employ lower hot air temperatures. If a hot air temperature of 38-40℃ is used, the increase in cracked grains will be less than 2%. The occurrence of cracked grains during rice drying is not only related to the hot air temperature, but also to the moisture content of the hot air and the initial moisture content of the rice. Restricting the drying rate of rice is important because both rapid drying and rapid cooling can lead to cracked grains. To ensure high-quality drying results, it is recommended to control the drying rate at or below 1.5%, which means that the hourly precipitation rate should not exceed 1.5%.