基于Kriging模型的造纸法再造烟叶筛分工艺参数优化方法
Optimization of sieving process parameters for paper-based reconstituted tobacco based on Kriging model
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摘要: 为充分考虑造纸法再造烟叶筛分工艺参数的随机变化,以水流速度和烟浆固含量为设计参数,以筛分后12目以上纤维质量占比和50目以下纤维质量占比为性能响应,提出了基于Kriging模型的造纸法再造烟叶筛分工艺参数优化方法。首先,以当前工艺参数为继承点进行继承拉丁超立方采样和筛分实验,在此基础上构建初始Kriging模型以拟合水流速度和烟浆固含量与12目以下纤维质量占比和50目以上纤维质量占比间的隐式关系;其次,采用局部自适应采样方法开展序列采样以提高Kriging模型在优化迭代关键点的精度;最后,利用蒙特卡罗仿真-序列二次规划计算最优的再造烟叶筛分工艺参数。结果表明:优化得到的水流速度和烟浆固含量分别为6.31 L/min和0.53%,该工艺参数下的12目以下纤维质量占比为13.72%,较优化前提升了7.19%;50目以上纤维质量占比为17.65%,较优化前降低了4.13% 。该方法能够满足造纸法再造烟叶筛分工艺参数优化需求。Abstract: In order to fully consider the random variation of sieving process parameters,this paper constructs the reliability-based optimization model for reconstituted tobacco process parameters,which taking the percentage of fibers below 12 mesh as the optimization objective,water flow rate and pulp concentration as the design parameters,and the percentage of fibers over 50 mesh as the probabilistic constraint. Firstly, the current process parameters are used as inheritance points for Latin hypercube sampling and screening experiments. Based on this, an initial Kriging model is constructed to fit the implicit relationship between water flow velocity, smoke slurry solid content, and the proportion of fiber mass below 12 mesh and above 50 mesh. And local adaptive sampling (LAS) was carried out to update the Kriging model to ensure the approximate accuracy of key positions at optimization iteration.Finally,Monte Carlo simulation (MCS)-Sequential quadratic programming (SQP) was used to solve the optimization model of screening process parameters. The results indicated that the optimized water flow rate and pulp concentration were 6.31 L/min and 0.53% , respectively. Under this process parameter, the proportion of fiber below 12 mesh was 13.72% , which was 7.19% higher than before optimization. The proportion of fibers over 50 mesh was 17.65% , which was a decrease of 4.13% compared to before optimization. This method could meet the optimization requirements of screening process parameters for paper making reconstituted tobacco leaves.
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