The factor of pelletizer was added into the objective function, which effectively restrained the sharp change of controlled variable and ensured the security of the grade transition process.

• 在目标函数中考虑造粒过程的影响后，能够有效抑制操作变量的剧烈变化，使其变化轨迹趋于平缓，保证切换生产过程的安全进行。