feed forward 是什么（乙烯进料）？ the amount of heat required for hot steam standby is approximately 40% of that required for feed. there will be a substantial heat imbalance when feed is first admitted. this heat imbalance and the time involved in raising cracking temperatures will result in lower ethylene and propylene yields and increased heavier hydrocarbon yields. it is preferred to raise rates as quickly as possible while adhering to guidelines. taking a furnace off line or putting one online has a major effect of feed forward, approximately 20% of total feed either way. 与裂解炉正常进料时所需的热量相比，裂解炉热备时（即我们装置所说的ds开车状态）所需的热量仅为其40%。因此，当裂解炉投油时，炉子的热量将有极大地不平衡。 由于热量的不平衡以及将裂解炉调整到正常的裂解温度的过程中，将会导致裂解出的乙烯丙烯产量降低，重烃产量增加，这时最好按照指导尽快增加裂解炉的热量（这里rate我想是否翻译成热量，我们装置在裂解炉投油的同时，都要增点烧嘴，增加裂解热量）。将一台裂解炉退出或投一台裂解炉会对总进料量造成影响，无论那种情况，其影响量都是总进料的20%。 在这里feed forward 我想是否可以翻译成总进料查看更多
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