响应曲面法在CTD烘梗丝工艺参数优化中的应用

Response Surface Methodology as an Approach for Optimization of CTD Drying Process of Cut Stem

在单因素试验的基础上,利用响应曲面法的中心复合表面设计,对CTD烘梗丝工艺参数进行优化分析。选择PG温度、PG流量、PG含氧量作为优化因素,研究各因素的不同水平对烘梗丝出口含水率均值的影响;选择HT蒸汽流量、物料流量作为优化因素,研究各因素的不同水平对烘梗丝出口含水率标准偏差的影响。通过响应曲面分析得到烘梗丝的最优条件为PG温度200℃,PG流量21 500 m^3/h,PG含氧量2.21%,HT蒸汽流量391.6 m^3/h,物料流量3 428 kg/h;在此条件下,烘后梗丝含水率CPK值可达到1.21。

Response surface methodology （RSM） based on a central composite face-centered design （CCF） is applied for the optimization of CTD drying process of cut stem. In RSM analysis, the pairwise interactive effects of PG temperature, PG flow, oxygen level, on the yield of the mean and the HT steam flow, inlet cut stem flow on the yield of the standard deviation of outlet moisture are examined. Results show that the optimal values of the above parameters are determined as follows ： PG temperature 200℃, PG flow 21 500 m^3/h, oxygen level 2.21%, HT steam flow 391.6 m^3/h and inlet cut stem flow 3 428 kg/h. Under the optimized conditions, the experimental CPK value of outlet moisture is 1.21.