Agitation tank emptying and output solution concentration keeping disturbance-rejection method with saturation characteristic

A technology of solution concentration and stirring tank, which is applied in the direction of non-electric variable control, simultaneous control of multiple variables, instruments, etc., can solve the problem of excessive deviation between solution concentration and target concentration, and achieve the effect of eliminating local interference

Pending Publication Date: 2018-12-18
LANZHOU UNIVERSITY
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  • Application Information

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Problems solved by technology

However, in fact, the mixing tank is often disturbed by disturbances during on-site operations. It is difficult to eliminate such disturbances in the previous inventive methods, which may cause too large a deviation between the actual output solution concentration and the target concentration, and ultimately cannot meet the requirements. actual needs

Method used

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  • Agitation tank emptying and output solution concentration keeping disturbance-rejection method with saturation characteristic
  • Agitation tank emptying and output solution concentration keeping disturbance-rejection method with saturation characteristic
  • Agitation tank emptying and output solution concentration keeping disturbance-rejection method with saturation characteristic

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings. A kind of anti-disturbance and the method for emptying and maintaining the concentration of the output solution of the stirred tank with saturation characteristics, comprising the steps of:

[0037] 1) Obtain the parameters of the mixing tank, the parameters include the concentrations of the two liquids input into the mixing tank and Current and expected output solution concentration C of the stirred tank bd , C bd =C b (0), the expected trajectory of the liquid level drop in the stirring tank h d (t), where The system equation of the mixing tank is as follows:

[0038]

[0039]

[0040] where k 1 and k 2 In order to affect the outflow rate constant of the dynamic process of the system, h(t) is the height of the liquid level drop in the stirring tank, t is the time, and w 1 (t), w 2 (t) is the flow rate of the two liquids input into the mixing tank, C ...

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Abstract

The invention provides an agitation tank emptying and output solution concentration keeping disturbance-rejection method with saturation characteristic. The method comprises the following steps: 1) acquiring parameters of an agitation tank, wherein the parameters include concentration C<b1> and C<b2> of solution of two types, desired output solution concentration C<bd>, and desired trajectory h<d>(t) of dropping of liquid level in the agitation tank, wherein C<b1> is not equal to C<b2>; 2) defining a residual function and deducing out a controller equation set in combination with a system equation of the agitation tank; 3) setting flow rate w<1>(t) and w<2>(t) of two types of liquid input into the agitation tank according to the controller equation set, thereby realizing that: (1) the method has the disturbance-rejection characteristic, the system of the agitation tank can effectively eliminate local disturbance, and even though local disturbance exists, the method also can guarantee the agitation tank to continuously output the solution of target concentration; (2) the method has the saturation characteristic, can effectively constrain flow rate of the input liquid of two types ofthe agitation tank, and thus, a maximum value of the flow rate of the input liquid of two types of the agitation tank is kept to be in a certain range.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to an anti-disturbance and saturation control method for emptying a stirring tank and maintaining the concentration of an output solution. Background technique [0002] The problem of emptying the solution of the mixing tank has become a very important problem in the industrial field of our country at present, and the existing technology pays more attention to how to empty the sediment in the tank and only discharge it as liquid waste, which will cause very Serious waste of industrial resources and pollution of the natural environment. In addition, the actual operating environment of the mixing tank is complex and changeable. For example, the mixing tank is in a real-time moving state, or is disturbed by changes in external temperature, etc. These complex actual conditions put forward higher requirements for the stability and accuracy of the mixing tank system. The invention met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04G05D27/02
CPCG05B13/042G05D27/02
Inventor 金龙段文辉刘梅张继良
Owner LANZHOU UNIVERSITY
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