关键词: 稻谷, 缓苏工艺, 参数优化, 干燥速率, 爆腰率

Abstract: In order to reduce the crack rate of rice after drying and improve the drying efficiency of rice, this experiment explored the effects of technological parameters such as retarding temperature, retarding ratio and initial moisture content of rice on the crack growth rate and drying rate of rice, and the mechanism of retarding technology to inhibit drying cracks of rice. The technological parameters of rice slow-tempering drying were optimized by three-dimensional quadratic orthogonal rotation combination design. Taking slow-tempering temperature, slow-tempering ratio and initial moisture content of rice as experimental factors, Box-Behnken test was used to establish a regression model and analyze the relationship between each factor and the experimental indicators. The Design-Expert 12 software was used to optimize the parameters and analyze the data of the test results, and the optimal process parameters were obtained as follows: the retarding temperature was 57℃, the initial moisture content was 23%, and the retarding ratio was 2.4∶1. Under these combined parameters, the rice crack growth rate is 9.53%, the drying rate is 0.104%/min, and the relative error is small. The results show that the optimized combination parameters have a positive effect on reducing the crack growth rate and improving the drying rate of rice, which can provide a theoretical basis for practical production.

Key words: rice, tempering process, parameter optimization, drying rate, crack rate