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Process dynamic control scheme for bulkhead distillation column with partition plate at middle-lower part

A technology for dynamic control of the next-wall rectification tower, which is applied in the directions of distillation adjustment/control, fractionation, distillation separation, etc., and can solve problems such as difficult control of the next-wall rectification tower, product quality requirements, poor stability, etc.

Pending Publication Date: 2022-03-29
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is that the control of the rectifying tower with the next wall is difficult, the stability is not good, and the requirements of product quality and other problems

Method used

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  • Process dynamic control scheme for bulkhead distillation column with partition plate at middle-lower part
  • Process dynamic control scheme for bulkhead distillation column with partition plate at middle-lower part
  • Process dynamic control scheme for bulkhead distillation column with partition plate at middle-lower part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A Dynamic Control Scheme of Dividing Wall Distillation Column with Partition in the Middle and Lower Part

[0034] figure 2 It is a schematic diagram of a process dynamic control scheme of a dividing wall rectification column with partitions in the middle and lower parts. Taking the separation of the ternary mixture of isopentane, n-pentane and n-hexane as an example, the light component isopentane is extracted from the top of the main tower, the middle component n-pentane is extracted from the side line, and the heavy component n-hexane is extracted from the main column. Extracted from the bottom of the tower. Its process flow diagram is as follows figure 1 shown. The control loop of the present invention is as follows:

[0035] (1) Feed flow control loop, including for adopting flow controller to control the feed flow into the pre-separation tower;

[0036] (2) The pressure control circuit at the top of the tower, including using a pressure controller to control...

Embodiment 2

[0042] The process dynamic control scheme of the dividing wall rectification column with the partition plate in the middle and lower part of the control structure described in Example 1 is adopted, and the separation of isopentane, n-pentane and n-hexane is taken as an example. After the process runs smoothly for 1 hour, the feed flow rate changes by ±10%, from the original 300kmol / h to 330kmol / h or 270kmol / h, from image 3 It can be seen from the figure that through the function of the control loop, the product purity returns to the original set value in a short time and with a small overshoot under the disturbance of the flow rate ±10%. The maximum overshoot does not exceed 0.005, the longest time does not exceed 7h, and the final product purity returns to the set value, indicating that the control loop can well deal with disturbances within ±10%, and has good robustness and stability.

Embodiment 3

[0044] The process dynamic control scheme of the dividing wall rectification column with the partition plate in the middle and lower part of the control structure described in Example 1 is adopted, and the separation of isopentane, n-pentane and n-hexane is taken as an example. After the process runs smoothly for 1 h, the feed composition isopentane changes ± 10%, and the mole fraction changes from the original 0.33 to 0.363 or 0.297, from Figure 4 It can be seen from the figure that through the function of the control loop, the product purity returns to the original set value in a short time and with a small overshoot under the disturbance of the composition ±10%. The maximum overshoot does not exceed 0.002, the longest stabilization time is 7 hours, and the final product purity returns to the set value, indicating that the control loop can well deal with disturbances within ±10%, and has good robustness sex and stability.

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Abstract

The invention provides a dynamic control scheme of a dividing wall column process for separating isopentane, n-pentane and n-hexane. According to the process, separation is carried out through a dividing wall rectifying tower, control loops in the control scheme comprise a feeding flow control loop, a tower top pressure control loop, a liquid level control loop, a liquid phase distribution ratio control loop, a gas phase distribution ratio control loop, a composition control loop and a temperature-composition cascade control loop. And under the disturbance of + / -10% of feeding flow and feeding composition, the control scheme has a good control effect, and the product purity can reach the original set value.

Description

technical field [0001] The invention belongs to the field of chemical distillation process and automatic control, and relates to a process dynamic control scheme of a partition wall rectification tower in the middle and lower parts. Background technique [0002] Distillation technology is one of the most widely used separation techniques in the chemical and petrochemical industries. However, the energy consumption of the rectification process accounts for up to 40% of the chemical industry. With the decrease of non-renewable energy sources, in order to save energy consumption, it has become one of the urgent problems to be solved in the modern process industry to deeply tap the energy-saving potential of the rectification process and improve its thermodynamic efficiency. As one of the most important ways to intensify the process, the dividing wall distillation column has been extensively studied by scholars at home and abroad. [0003] Due to the high coupling between the ...

Claims

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Application Information

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IPC IPC(8): B01D3/14B01D3/42
CPCB01D3/141B01D3/42B01D3/4211B01D3/4294
Inventor 付琼璐许良华
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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