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Active-disturbance-rejection control structure and control method for binary rectification process

A technology of active disturbance rejection control and rectification process, which is applied in the field of active disturbance rejection control structure and control of binary distillation process, can solve problems such as waste of process energy, state deviation of rectification tower, and influence on product quality, and achieve control The effect of fewer parameters, low dependence, and easy engineering realization

Active Publication Date: 2022-03-29
NANTONG UNIVERSITY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to various external disturbances in the rectification process, if the control system design of the rectification process is unreasonable, the states in the rectification tower will deviate, resulting in waste of process energy and affecting product quality

Method used

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  • Active-disturbance-rejection control structure and control method for binary rectification process

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Embodiment 1

[0046] see Figure 1 to Figure 2 , the technical solution provided by the present invention is a control structure and control method for a rectification tower in a binary rectification process, figure 1 It is a schematic diagram of the binary distillation process. In the figure, the mixture enters the tower from the feed inlet in the middle of the tower. The upper area of ​​the feed inlet is generally called the rectification section, and the lower area of ​​the feed inlet is generally called the stripping section. The light component products come from the top of the rectification section. The condenser is extracted, and the heavy component is extracted from the tower kettle.

[0047] Taking the separation of benzene-toluene mixture by the binary rectification tower as an example, the light component benzene is extracted from the top of the tower, and the heavy component toluene is extracted from the bottom of the tower.

[0048] figure 2 The above control structure is s...

Embodiment 2

[0069] The binary distillation column with the control structure and control method of Example 1 is used to separate the benzene-toluene mixture. The rectification column is designed with a total of 41 layers, including 39 layers of trays, a reboiler and a condenser, and the feed inlet is located at the 21 layers of trays. After the binary distillation tower runs smoothly, the set value of the light component product concentration at the top of the tower is changed from 0.99 to 0.995 at t=20min, and the set value of the light component product concentration at the bottom of the tower is changed from 0.01 at t=100min is 0.005, and the liquid holdups of the condenser and reboiler remain unchanged. The change of liquid holdup and concentration of light component products at both ends is as follows: image 3 shown. From image 3 It can be seen from the figure that under this control method, the concentration of light component products at the top and bottom of the tower can be ...

Embodiment 3

[0071] The binary distillation column with the control structure and control method of Example 1 is used to separate the benzene-toluene mixture. After the binary distillation tower runs smoothly, the feed flow rate increases by 20% at t=20min, Figure 4 It is the liquid holdup of the condenser and reboiler and the change of the concentration of light component products at both ends. From Figure 4 It can be seen from the figure that under this control method, the concentration of light components at the top and bottom of the tower returns to the set value within 100 minutes, and the absolute values ​​of the maximum fluctuations are less than 0.0001 and 0.00015, respectively. The liquid holdup of the condenser and the reboiler can also return to the set value within 60 minutes after being disturbed, and the absolute value of the maximum fluctuation is less than 0.0017 and 0.0011 respectively. This shows that the control structure and control method have good robust performan...

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Abstract

The invention provides an active-disturbance-rejection control structure and a control method for a binary rectification process, and belongs to the technical field of energy-saving control of a chemical rectification process. The technical problems that various external disturbances exist in the existing rectification process, so that various states in the rectification tower are deviated, the process energy is wasted, and meanwhile, the product quality is influenced are solved. According to the technical scheme, the control structure for the product purity and quality of the binary rectifying tower comprises four control loops, namely a condenser liquid level control loop, a reboiler liquid level control loop, a tower top light component product concentration control loop and a tower bottom light component product concentration control loop; the control method comprises the step of realizing control of the four control loops by designing the four active-disturbance-rejection controllers. The control method has the beneficial effects that the degree of dependence of the control method on a mathematical model in the rectification process is low, the set value tracking of the concentration of the products at the tower top and the tower bottom can be realized, the purity of the products is ensured to be slightly influenced under the condition that the feeding flow or components are greatly disturbed, and the method has relatively strong robustness and stability.

Description

technical field [0001] The invention relates to the technical field of energy-saving control of chemical distillation process, in particular to an active disturbance rejection control structure and control method of binary distillation process. Background technique [0002] The petrochemical industry is a large energy consumer, and the distillation process is one of the representatives of high energy consumption in the petrochemical process. Although the rectification technology is widely used, according to statistics, the energy consumption of the rectification process accounts for 67% of the energy consumption of the entire petrochemical industry and 3% of the world's energy consumption. The energy utilization rate of the rectification process is extremely low, and 80%-90% of the energy in the whole process is wasted. This limits the sustainable development of the petrochemical industry. Therefore, it is very important to study the energy-saving technology of the rectifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/02
CPCG05B13/024Y02P20/10
Inventor 程赟范云雷袁银龙戴凌宇杜宇笙
Owner NANTONG UNIVERSITY
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