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Apparatus and method for pH control in wastewater treatment plants and other systems

A controlled and predictive control technology, applied in the field of control systems, can solve problems such as pH difference control and difficult tuning of PID controllers

Active Publication Date: 2014-02-19
HONEYWELL INT INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, tuning of PID controllers is often difficult, typically resulting in poor control of pH

Method used

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  • Apparatus and method for pH control in wastewater treatment plants and other systems
  • Apparatus and method for pH control in wastewater treatment plants and other systems
  • Apparatus and method for pH control in wastewater treatment plants and other systems

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[0192]

[0193] In the setup for this problem, eight nodes are distributed linearly over the output range, which varies between 11 and 52. Since this is an output non-linearity, a PRMS signal is used, which has min and max values ​​of 9 and 13 respectively. As can be seen from the problem formulation, the disturbance to the output power is 7%. This simple example converges in only three iterations. And, if Figure 17 The predictive performance shown in is good, Figure 17 show respectively and Lines 1702 to 1704.

[0194] Figure 17 Another aspect depicted in is the fact that the data is discontinuous. Being able to handle discontinuities as well as bad data (NaNs) is a requirement for any method used in industrial layouts. It is extremely rare that all the data collected for any identification is contiguous. In fact, even in the rare cases where it is adjacent, data often need to be excluded from identification for one reason or another. This requirement result...

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Abstract

A method includes obtaining (4002) a nonlinear model (3124) that represents a pH of a material (3104) in a process to be controlled. The model is generated using an orthonormal basis function and an ordinal spline basis function. The method also includes performing (4004) non-linear model predictive control of the process using the model. The method could also include generating the model using the orthonormal basis function and the ordinal spline basis function. This could include identifying a distribution (3300) of knots and multiple ordinal spline functions, where each ordinal spline function is associated with one of the knots. The ordinal spline basis function can be generated using at least one of the ordinal spline functions.

Description

[0001] [0002] CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY CLAIM [0003] This application claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Patent Application No. 61 / 497,758, filed June 16, 2011, which is hereby incorporated by reference. technical field [0004] The present disclosure generally relates to control systems. More specifically, the present disclosure relates to devices and methods for pH control in wastewater treatment plants and other systems. Background technique [0005] Wastewater can include a wide variety of undesirable constituents, so wastewater is typically treated in large wastewater treatment plants. One type of wastewater treatment process involves the use of bacteria to convert undesirable wastewater components into more desirable components. However, difficulties arise in creating the proper environment for bacteria to thrive and thereby provide optimal performance. For example, pH control is widely used in wastewater tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D21/02C02F1/66
CPCG05D21/02G05B13/048G05B21/00C02F1/008C02F2209/06
Inventor J.W.麦克阿瑟S.K.达什R.K.巴斯卡
Owner HONEYWELL INT INC
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