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Control method for quick change working condition

A control method and working condition technology, applied in chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve problems such as control divergence, large fluctuations, and exceeding the system, so as to improve accuracy, reduce the number of iterative corrections, and avoid time-consuming Lag effect

Active Publication Date: 2020-04-03
马光俊 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual operation process, usually a change period is 20 to 50 seconds. If real-time data feedback is used for adjustment, for example, pneumatic control valves or other types of valves are used, due to time lag and other factors, it cannot match the rapid change period. real-time adjustment
Therefore, in the existing engineering practice, if the control valve adopts automatic feedback control, such as PID setting adjustment, it will cause control divergence and cannot operate stably. Large, beyond the tolerance of the system, which will lead to production stoppage and seriously affect the normal operation of the process

Method used

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  • Control method for quick change working condition
  • Control method for quick change working condition
  • Control method for quick change working condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Refer to the above control method for such as figure 1 The flow change conditions shown are controlled.

[0057] Such as figure 1 As shown, the time of the cycle is discretized into n time points, which are recorded as t in turn 0 , t 1 ,...,t n , preset a valve opening parameter corresponding to each time point, and at the same time, set the ideal flow data corresponding to each time point, see figure 1 Preset opening parameters shown along with ideal flow curve.

[0058] The system operates according to the above preset opening parameter conditions, and runs for several cycles to obtain the actual flow data. The deviation between the actual flow data and the ideal flow data and the preset valve opening parameters are used as independent variables to calculate the new flow rate. The opening parameter of the valve, the opening parameter of the new valve is used as the opening parameter of the preset valve, and the above process is repeated for iterative correction ...

Embodiment 2

[0060] Refer to the above control method for such as Figure 4 The pressure change conditions shown are controlled.

[0061] Such as Figure 4 As shown, the time of the cycle is discretized into n time points, which are recorded as t in turn 0 , t 1 ,...,t n , preset a valve opening parameter corresponding to each time point, and at the same time, set the ideal pressure data corresponding to each time point, see Figure 4 Preset opening parameters and ideal pressure curves shown.

[0062] The system operates according to the above preset opening parameter conditions, and runs for several cycles to obtain the actual pressure data, see Figure 5 In the actual pressure curve shown, the deviation between the actual pressure data and the ideal pressure data and the opening parameter of the preset valve are used as independent variables to calculate the new valve opening parameter, and the new valve opening parameter is used as Preset the opening parameters of the valve, repea...

Embodiment 3

[0064] Refer to the above control method for such as Figure 7 The pressure change conditions shown are controlled.

[0065] Such as Figure 7 As shown, the time of the cycle is discretized into n time points, which are recorded as t in turn 0 , t 1 ,...,t n , preset a valve opening parameter corresponding to each time point, and at the same time, set the ideal pressure data corresponding to each time point, see Figure 8 Preset opening parameters and ideal pressure curves shown.

[0066] The system operates according to the above preset opening parameter conditions, and runs for several cycles to obtain the actual pressure data. The deviation between the actual pressure data and the ideal pressure data and the preset valve opening parameters are used as independent variables to calculate the new value. The opening parameter of the valve, the opening parameter of the new valve is used as the opening parameter of the preset valve, and the above process is repeated for iter...

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PUM

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Abstract

The invention discloses a control method for a quick change working condition. Actual working condition data are obtained by presetting valve opening parameters, so that new valve opening parameters are obtained through calculation, iterative loop is carried out according to the opening parameters, finally, the valve opening parameters meeting the process control requirement are obtained, and real-time control on the quick working condition is achieved. The method aims at solving the problems in a quick change process, the working condition control process cannot be adjusted according to real-time data feedback due to short change period; the preset valve opening parameters are corrected in an iterative loop mode, so that the valve opening parameters meeting the technological requirementsare expected to be obtained, and actually, the stable operation of the system is guaranteed by accurately obtaining the valve opening parameters which tends to ideal working condition data at the current time point in a cycle period.

Description

technical field [0001] The invention relates to a control method for rapidly changing working conditions, in particular to a control method in which working condition change curves such as flow rate or pressure fluctuate periodically, and belongs to the technical field of process control. Background technique [0002] Adsorption technology refers to that in the solid phase-gas phase, solid phase-liquid phase, liquid phase-gas phase, gas phase-gas phase system, the density of a certain phase or the concentration of solute dissolved in the phase changes at the interface A phenomenon in which the actual body is different. In the field of adsorption, taking pressure swing adsorption oxygen production technology as an example, there are often situations where the working conditions change rapidly. [0003] In the prior art, in order to realize the stable operation of the pressure swing adsorption oxygen production process and improve the recovery efficiency of the product gas, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/047C01B13/02
CPCB01D53/047C01B13/0259
Inventor 马光俊宋筱露董静张孝贵
Owner 马光俊