Control device and method of divided-wall rectifying tower and divided-wall rectifying tower

By setting temperature control circuits in different sections of the partition distillation tower and adjusting the temperature parameters in the tower, the problem of difficult control of the partition distillation tower in the face of large disturbances is solved, and the smooth control of the entire tower and the guarantee of product purity are achieved.

CN119680230APending Publication Date: 2025-03-25PETROCHINA CO LTD
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Patent Information

Application Number
CN202311242623.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-25
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The wall distillation tower is difficult to achieve stable control when there is a large disturbance in the feed flow rate or components, and the prior art component control methods are not easy to be used in industrial applications.

Method used

By using the temperature parameter control method, temperature control circuits are set in the distillation section, the side line section, the distillation section and the pre-fraction section respectively, the overhead distillation liquid flow, the side line production flow, the tower kettle liquid flow and the liquid separation ratio are adjusted to control the temperature parameters of each sensitive plate.

Benefits of technology

After large disturbances in the feed flow or components (>±10%, the maximum fluctuation amplitude can reach ±20%), stable control of the entire tower can be achieved in a short period of time, ensuring the purity of each product, simplifying the control parameters and loops, and easy to promote and apply.

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Abstract

The invention provides a control device and method for a divided-wall rectifying tower and the divided-wall rectifying tower, and the control device comprises a first temperature control loop which is arranged on a rectifying section sensitive plate and is configured to control the temperature parameter of the rectifying section sensitive plate by adjusting the flow feedback of tower top distillate; the second temperature control loop is arranged on the side line section sensitive plate and is configured to feed back and control the temperature parameter of the side line section sensitive plate through the side line extraction flow; the third temperature control loop is arranged on the stripping section sensitive plate and is configured to feed back and control the temperature parameter of the stripping section sensitive plate by adjusting the tower kettle liquid flow; and the fourth temperature control loop is arranged on the pre-fractionation section sensitive plate and is configured to feed back and control the temperature parameter of the pre-fractionation section sensitive plate by adjusting the liquid separation ratio in the divided-wall rectifying tower. According to the invention, stable control of the whole tower can be realized in a short time after a multi-component mixture is greatly disturbed.
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