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A Soft Sensing Method for Concentration in Dividing Wall Distillation Column Based on Nonlinear Filtering

A separation wall rectification column and nonlinear filtering technology, which is applied to the soft measurement of the concentration of separation wall rectification column based on nonlinear filtering and the soft measurement of chemical processes, can solve problems such as small residual error, and achieve fast and error-free control. , to avoid the effects of high prices and long delays

Active Publication Date: 2021-06-08
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the present invention, the unscented Kalman filter with stable control results, less vibration and small residual error is adopted, which solves the problem of reciprocating vibration caused by the extended Kalman filter due to the increase of the concentration detection interval

Method used

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  • A Soft Sensing Method for Concentration in Dividing Wall Distillation Column Based on Nonlinear Filtering
  • A Soft Sensing Method for Concentration in Dividing Wall Distillation Column Based on Nonlinear Filtering
  • A Soft Sensing Method for Concentration in Dividing Wall Distillation Column Based on Nonlinear Filtering

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Embodiment 1

[0015] Embodiment 1: Using the concentration soft-sensing method integrated with the data-driven model of the present invention to predict and control the concentration of the Kaibel dividing wall distillation column.

[0016] figure 1 Among them, the total number of plates in the pre-separation section is 40, and the feed plate is 20; the total number of plates in the main separation section is 70, the gas phase feed plate is 21, the liquid phase feed plate is 60, and the side line 1 (S1) production plate 30, side line 2 (S2) production plate is 50. The feed is methanol, ethanol, n-propanol, n-butanol and other mole fraction saturated liquid feeds, and the feed flow rate is 1000 mol / h. The heat load of the top condenser is 26.007kW, and the heat load of the bottom reboiler is 25.107kW. The operating pressure at the top of the tower is 1 atm, and the pressure drop of the single plate in the tower is 0.0068 atm. The molar reflux ratio at the top of the tower is 9.604. ...

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Abstract

The invention relates to a non-linear filtering-based concentration soft-sensing method for a partition wall rectification tower. The nonlinear unscented Kalman filter is used for error correction for the concentration soft-sensing method integrated with a data-driven model. When the concentration detector detects once every 2 hours or more, the error corrector uses nonlinear unscented Kalman filter for error correction; the error corrector can also use improved nonlinear unscented Kalman filter for error correction, wherein the improved When the nonlinear unscented Kalman filter is used for error correction, when the concentration point is corrected at the previous moment <c> k‑1 The covariance of P k‑1 When the matrix is ​​not positive definite, use the nearest symmetric positive definite matrix on its F‑norm instead of P k‑1 , for Cholesky decomposition. The invention solves the problem of oscillation in the extended Kalman filter due to the increase of the concentration detection interval, and realizes the rapid and error-free control of the dividing wall rectification tower.

Description

technical field [0001] The invention relates to a soft measurement method for the concentration of a partition wall rectification tower, in particular to a soft measurement method for the concentration of a partition wall rectification tower based on nonlinear filtering, which belongs to the soft measurement method of the chemical process. Background technique [0002] The dividing wall rectification tower is a thermally coupled rectification tower that integrates two (or more) rectification towers into one tower shell to realize the separation of ternary (and above) systems. Compared with the traditional rectification column system, the dividing wall distillation column can usually save about 30% of energy consumption, save about 30% of equipment investment, and save space. Among them, the four-component Kaibel dividing wall distillation column is an important type of dividing wall distillation column. It is composed of a pre-fractionation column and a main column. to conn...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00G06N3/02B01D3/14
CPCB01D3/14G01N33/00G06N3/02
Inventor 钱行黄克谨陈海胜苑杨张亮
Owner BEIJING UNIV OF CHEM TECH