公开(公告)号：US4251248A

公开(公告)日：1981-02-17

申请号：US36015

申请日：1979-05-04

申请人： Takeshi Iyoki ,  Taichi Katsuki ,  Takumi Mizokawa ,  Takaharu Goto

发明人： Takeshi Iyoki ,  Taichi Katsuki ,  Takumi Mizokawa ,  Takaharu Goto

IPC分类号： F25J3/04 ,  G05B7/02

CPC分类号： F25J3/04848 ,  F25J3/0429 ,  F25J3/04412 ,  F25J3/04836 ,  F25J2205/24 ,  F25J2245/40

摘要： A method and apparatus for automatic change of operations in an air separation plant in increasing or decreasing the amounts of products. The present invention is characterized in that intended change values of the flow rate of feed air to be introduced into an air separation plant, the flow rate of liquid air recycled to an upper tower from a lower tower of a rectification column, the flow rate of recycled liquid nitrogen and the flow rate of an expansion turbine gas flowing in an expansion turbine are computed from the values of increased or decreased amounts of products. At the time of initiation of change of the flow rates, the ratio of the flow rate of feed air to the flow rate of the product is increased, and the flow rates of the feed air, recycled liquid air, recycled liquid nitrogen, expansion turbine gas and product are automatically changed to the intended values while gradually reducing the above ratio, and the period ranging from the point at which the intended values are attained to the point when the unstable operation state in the air separation plant is completed is set as the operation change-inhibiting period and the subsequent change of the flow rates is inhibited during this period.

摘要翻译： 一种用于在增加或减少产品量的情况下自动改变空分设备中的操作的方法和装置。 本发明的特征在于，引入空气分离装置的进料空气的流量的期望变化值，从精馏塔的下塔再循环到上塔的液体空气的流量， 再循环的液氮，并且在膨胀涡轮机中流动的膨胀涡轮机气体的流量根据产品数量的增加或减少的值计算。 在开始流量变化时，进料空气的流量与产品的流速的比率增加，进料空气，再循环液体空气，再循环液氮，膨胀涡轮机的流量 气体和产品在逐渐降低上述比率的同时自动变化为预期值，并且从达到预期值的点到空气分离装置中的不稳定运行状态完成的时间段被设定为 在此期间抑制了操作变化抑制期和随后的流量变化。