Дисертації з теми "PH control system"
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Favaro, Juliana. "Controle preditivo aplicado à planta piloto de neutralização de pH." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-16072013-170810/.
Повний текст джерелаThe predictive control is an advanced control technique which has gained evidence in the economic and ecological context because the search for sustainability and process optimization. This control has already been applied by the chemical and petrochemical industries. The purpose of this project is to develop a predictive controller which will be applied in a pH neutralization plant located in the Industrial Processes Control Laboratory at Polytechnic School of the University of São Paulo. The development of this project can be divided into four stages: implementation of regulatory control loops, identification of the system, construction of the predictive controller, applications and experimental analysis. The first step is necessary in order to study the plant and to implement some internal loops using PID controllers. In the second step, the identification process of the plant model will be done. It is important to note that operating points and internal parameter settings are very important for modeling. In the third stage, using the model obtained from the identification process, a predictive controller is built from auxiliary software such as MATLAB and IIT 800xA (by ABB), which will be used for the development and implementation of the control algorithm. Finally, the last step consists in collecting and analyzing the results of the pH neutralization plant. At this stage the responses of each controller will be compared: PID controller, MPC controller in cascade mode with PID and MPC controller acting directly on actuators.
Alvarado, Christiam Segundo Morales. "Identificação e controle preditivo de uma planta-piloto de neutralização de pH." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-11072014-111203/.
Повний текст джерелаIdentification for control system is based specifically on the mathematical models construction from experimental data, whose aim is to find a relationship between a set of inputs and outputs of a dynamic process. These models are fundamentally important for the industrial processes controllers design. In this work is performed the identification and development of the control system for a pH neutralization pilot plant. The identification procedure is based on the real data collected from pH neutralization process, operating in closed loop. The models estimation is performed in two forms: (1) estimating models that represent all system behavior, including process PID controllers and (2) estimating process models with collecting data of the control signals and process output variables. The process models parameters estimation is performed with the algorithms studied in Chapter 4. With the estimated process models is a MPC (Model Predictive Control) control strategy was designed, creating two control schemes. First scheme will compute the optimal set points that will enter to the process-loops. The second scheme will compute the optimal control signals that will enter to the process. The type of MPC controller adopted is a QDMC (Quadratic Dynamic Matrix Control), allowing restriction of the input and output signals. The control schemes evaluation is performed by changing the set point of the process-loops and the disturbance influence. This disturbance is based on acid flow increased that enters the reactor.
Obut, Salih. "Control Of Ph In Neutralization Reactor Of A Waste Water Treatment System Using Identification Reactor." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606395/index.pdf.
Повний текст джерелаlinear and has time&ndash
varying characteristics. Therefore, the control of pH is a challenging problem where advanced control strategies are often considered. In this study, the aim is to design a pH control system that will be capable of controlling the pH-value of a plant waste-water effluent stream having unknown acids with unknown concentrations using an on&ndash
line identification procedure. A Model Predictive Controller, MPC, and a Fuzzy Logic Controller, FLC, are designed and used in a laboratory scale pH neutralization system. The characteristic of the upstream flow is obtained by a small identification reactor which has ten times faster dynamics and which is working parallel to actual neutralization tank. In the control strategy, steady&ndash
state titration curve of the process stream is obtained using the data collected in terms of pH value from the response of the identification reactor to a pulse input in base flow rate and using the simulated response of the identification reactor for the same input. After obtaining the steady&ndash
state titration curve, it is used in the design of a Proportional&ndash
Integral, PI, and of an Adaptive Model Predictive Controller, AMPC. On the other hand, identification reactor is not used in the FLC scheme. The performances of the designed controllers are tested mainly for disturbance rejection, set&ndash
point tracking and robustness issues theoretically and experimentally. The superiority of the FLC is verified.
David, William Whalley. "Intracellular pH and Na+ in heart cells during exposure to anisosmolar solutions : regulation of Na+-H+ exchange and Na+-K+ pump activity." Thesis, The University of Sydney, 1992. https://hdl.handle.net/2123/26486.
Повний текст джерелаGuner, Evren. "Adaptive Neuro Fuzzy Inference System Applications In Chemical Processes." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1252246/index.pdf.
Повний текст джерелаTammia, Rasmus. "Modeling and Control of Lime Addition in a Flotation Process." Thesis, Linköpings universitet, Reglerteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139331.
Повний текст джерелаBoshoff, Gerhardus Marthinus. "Investigating a novel in vitro embryo culture system – The Walking Egg Affordable Assisted Reproductive Technology." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/63049.
Повний текст джерелаDissertation (MSc)--University of Pretoria, 2017.
Obstetrics and Gynaecology
MSc
Unrestricted
Larsson, Jonathan. "PH-MÄTNING I PAPPERSPRODUKTION : En studie i optimeringar av elektriska mätsystem." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184577.
Повний текст джерелаThe fundamental principle for manufacturing paper is not a complicated one. However, for the paper to acquire specific properties, the process becomes increasingly complicated.Among other things, different chemicals are added, and the process is continuouslymonitored by various systems. One of these systems measures the pH-level of the pulp. This system is however constantly affected by measuring errors, which in turn leads to the incorrect dosage of the carbon dioxide used to lower the pH-level. This could in turn have a negative impact on the properties of the final paper. The underlaying purpose of this project is for the measuring system to ensure an even regulation of pH and therethrough guarantee an even paper quality. For this project, several question at issue, goals and subgoals have been established. The general goals cover establishing a statistical model for the error and estimate possible economical savings. To fulfil the goals and answer the questions at issue, firstly a basic understanding must be established for: concerned parts of the manufacturing process, the effect pH-level has on the process, the measuring principle of the pH-sensor, the design of the measuring systemand the routines concerning the measuring system. With this basis, the occurrence of measuring error is examined for the six measuring points. This is accomplished with two methods: The compilation of historical data and the compilation of manual measurementsexecuted under controlled conditions. The aspects examined are magnitude, frequency and the relation to process related values. Finally, a calculation for costs regarding the measuring system was established. This includes current carbon dioxide and maintenance costs. The result presents a statistical model for the measuring error, divided into historical and near time. The historical model shows that for all the addressed positions, a mean deviation occurred <0.3 pH-units. However, the minimum and maximum deviation could reach >0.8 pH-units. The model for near time shows significant deviations for four out of the six covered positions, which in turn shows relations to both paper quality and surface weight. With this statistical model possible savings were calculated. This in turn showed the possibility of savings for both carbon dioxide and maintenance. The conclusion for this project is the existence of a measuring error. Also, a connection between this and the process related aspects could be established. Although, the result cannot be completely guarantied. With this, possible savings through better accuracy could be estimated. Though, these were only in the size of 0.075‰ of the company’s total revenue.
Alvarado, Christiam Segundo Morales. "Estudo e implementação de métodos de validação de modelos matemáticos aplicados no desenvolvimento de sistemas de controle de processos industriais." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-05092017-092437/.
Повний текст джерелаLinear model validation is the most important stage in System Identification Project because, the model correct selection to represent the most of process dynamic allows the success in the development of predictive and robust controllers, within identification technique finite number and around the operation point. For this reason, the development of linear model validation methods is the main objective in this Thesis, taking as a tools of assessing the statistical, dynamic and robustness methods. Fuzzy system is the main component of model linear validation system proposed to analyze the results obtained by the tools used in validation stage. System Identification project is performed through operation real data of a pH neutralization pilot plant, located at the Industrial Process Control Laboratory, IPCL, of the Escola Politécnica of the University of São Paulo, Brazil. In order to verify the validation results, all modes are used in QDMC type predictive controller, to follow a set point tracking. The criterions used to assess the QDMC controller performance were the speed response and the process variable minimum variance index, for each model used. The results show that the validation system reliability were 85.71% and 50% projected for low and high non-linearity in a real process, respectively, linking to the performance indexes obtained by the QDMC controller.
Quachio, Raphael. "Análise do algoritmo PLS-PH para identificação de sistemas." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3139/tde-29062012-145724/.
Повний текст джерелаThe objective of this work consists in evaluating different applications of the PLS-PH (Partial Least Squares Prediction Horizon) algorithm, developed by (LAURI et al., 2010), in order to identify models for MPC controllers. The algorithms capacity of producing linear models capable of performing multiple steps-ahead prediction for both SISO and MIMO systems, with data collected in closed-loop. The algorithms capability of identifying non-linear models with the NARX polynomial structure is also evaluated.
Deng, Kangfa, Gerald Gerlach, and Margarita Guenther. "Force-compensated hydrogel-based pH sensor." SPIE, 2015. https://tud.qucosa.de/id/qucosa%3A35185.
Повний текст джерелаKalafatis, Alexandros. "Identification and control of Wiener-type nonlinear systems with applications to pH processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ27671.pdf.
Повний текст джерелаHamraoui, Mohamed. "Stabilisation des systèmes non-linéaires par retour d'état estimé. Applications aux réseaux de cinétique chimique et au traitement des eaux usées." Rouen, 1996. http://www.theses.fr/1996ROUES043.
Повний текст джерелаNigus, Tsegaye. "Experimental Investigation of Iron Control Systems Used in Fracking and Well Stimulation Fluids at higher pH." Thesis, University of Louisiana at Lafayette, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=1592418.
Повний текст джерелаThis experiment was designed to study iron control systems in fracking and well stimulation jobs at higher pH. Experimental study of iron control at high pH of this kind has not previously been reported in the literature. In addition, almost all of the widely used iron control chemicals today work at lower pH (≤4).
In this experiment, newly enhanced chemicals, such as EnerFlow 780, SC803, EDTA, Poly Itaconic acid, and TN801 were used and the following new result were found. In the absence of iron control chemicals, iron precipitation occurred at pH of 1.85 and completely precipitated at 3.5. SC803 has shown a very unique characteristic. The chelating characteristic of this product increases with pH. At lower pH (≤4), this product has shown weaker performance in curbing iron precipitation. Only 37% (average) initial iron was prevented from precipitating at this pH. However, when the pH was increased to above 4, its sequestering characteristic became more and more until it reached pH 13. Minimum precipitation was observed at pH of 11 & 12, which are 4.3% and 4.7%, respectively. Furthermore, SC803 was observed to cause unforeseen yellowish iron precipitation at lower pH.
TN801, a blend of SC803, EDTA and Poly Itaconic acid, showed the best result of the all the individual chemicals tested. It effectively curbed an average of 96% iron precipitation in all pH less than 13. EDTA and Poly Itaconic acid were added to enhance the performance of SC803 at lower pH. The result showed 86.8% maximum enhancement at lower pH and 0.3% at higher pH. TN801 was also able to dissolve 50% of crystalline iron sulfide, despite the fact that it is insoluble in nature. Furthermore, TN801 was tested on field and the anticipated result was achieved.
Davis, James Martin IV. "Biochar and pH as Drivers of Greenhouse Gas Production in Denitrification Systems." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/78273.
Повний текст джерелаMaster of Science
Szatkowska, Beata. "Performance and control of biofilm systems with partial nitritation and Anammox for supernatant treatment." Doctoral thesis, Stockholm : Mark- och vattenteknik, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4462.
Повний текст джерелаTouati, Eliette. "La phosphatase acide de ph optimum 2,5 d'escherichia coli : un systeme pour l'etude des effets negatifs de l'amp cyclique." Paris 6, 1986. http://www.theses.fr/1986PA066531.
Повний текст джерелаSinggeta, Ryan Laksmana, and Ryan Laksmana Singgeta. "Raspberry Pi Based pH Control for Nutrient Film Hydroponic System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/07335655842631944297.
Повний текст джерелаSu, Meng-wei, and 蘇孟偉. "Investigation of Wireless Remote Control System with Chlorine and pH Sensing Devices for Water Quality Monitoring." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41322695369883484060.
Повний текст джерела國立雲林科技大學
電子與光電工程研究所碩士班
100
In this thesis, the sensing properties of the chlorine and the pH sensing devices were discussed, and the chlorine and pH sensing devices applied to wireless measurement system and water quality monitoring system. The pH sensing membrane (ruthenium dioxide (RuO2)) was deposited on the silicon substrate by radio frequency (R. F.) sputtering system. The selective membrane of chlorine ion was prepared on the pH sensing membrane thin film by spin coating method. As well as, the sensing performance of the chlorine and pH sensing device with different manufacturing conditions were analyzed by using voltage-time system (V-T system) and electrochemical impedance spectroscopy (EIS). The quality of sensing device was measured by EIS before measurement, and the sensitivity and linearity of the sensing device was measured by V-T measurement system. The response time of the chlorine and pH sensing devices were less than 30 s and 10 s, respectively. The sensitivity and linearity of the pH sensing device were 55.27 mV/pH and 0.999, respectively. The sensitivity and linearity of the chlorine sensing device were 10.04 mV/ppm and 0.996 in sodium chloride (NaCl) solution, respectively. The sensitivity and linearity of the chlorine sensing device were 15.33 mV/ppm and 0.990 in sodium hypochlorite (NaClO) solution, respectively. Moreover, the lifetime of the chlorine sensing device was immersed at least 14 days in NaCl or NaClO solutions; the lifetime of the pH sensing device was immersed at least 15 days in pH buffer solutions. According to the experimental results, chlorine and pH sensing devices can be applied to water quality monitoring system with wireless measurement system for real-time measurement and long-term measurement.
Chen, Wan-Yuan, and 陳萬原. "Automatic Monitoring and Real-time Control of Modified Single Continuous-flow Sludge Batch Reactor System--Using ORP, pH as Control Parameters." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/90285682749327303620.
Повний текст джерела國立中央大學
環境工程學系
84
For open and dynamic systems, the conventional steady- state control strategies applied in wastewater treatment plants usually could not result in the best performance. From recent research results, it has been found that the breakpoint of the ORP and pH monitorning curves of biological treatment processes are correlated to the disappearance of nitrogen compound. Therefore, a real-time control strategy built by ORP and pH was used to control the single tank continuous- flow SBR in this study. The experimental procudures of this study contain two main sections as follows: (1) Fixed-time control study: to prove the feasibility of using ORP and pH as the control parameters under different operation conditions. Results obtained from fixed-time studies reflect that the ORP and pH profiles can represent the system''s dynamic characteristics, especially in pointing out the ends of nitrification and denitrification in form of breakpoint. It is noted that the locations and values of ORP and pH, on those endpoints, are highly correlated to F/M ratio with linear relationship. This result provided the primary ideas for set-point and set-time control. The breakpoints, set- point and set-time on the ORP and pH profiles were used to establish the real-time control strategy; (2) Real-time control study: some results had found in real-time study including: (a) pH was more appropriate parameter for controlling aerobic stage and ORP for controlling anoxic stage; (b) six mathematical calculation methods were appliced to determine the transfers of operation stages, and the multiplication of two slopes of ORP was appropriate for determining the breakpoint on ORP profile, and the differential of pH was more practical for determining the breakpoint of pH; (c) The real-time control study show a good proformane in COD and nitrogen removeal, approxicaty 93% COD , 88.68% NH4+-N, 86.54% T-N be reducted. In addition, the real-time study required less retention time than fixed-time study, it is approxicately 2.5 hours can be abridged. Thus, it can save the cycle time and aeration energy.
"Process Control Applications in Microbial Fuel Cells(MFC)." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.49364.
Повний текст джерелаDissertation/Thesis
Doctoral Dissertation Electrical Engineering 2018
Jhy, Lu Hsueh, and 呂學智. "The Preliminary Study of Automatic Monitoring and Control of Modified Single Continuous-flow Activated Sludge Batch Reactor --- Using ORP、pH and DO meter for System Monitoring." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/60814426193153122193.
Повний текст джерела國立中央大學
環境工程研究所
83
Modified single continuous-flow activated sludge system is a small and compact system which includes the functions of equalization, aeration and sedimentation, and can be used to remove organic carbon, nitrogen and phosphorus, simultaneously As a small and compact system, automatic monitoring and control of the system has become a basic requirement from the view- point of practical engineering. In concern of process automation, the main purpose of this study is to find the relationships between automatic monitoring and control parameters and system characterics. Furthermore, the study of the operation and control of the system based on previous relationships was also discussed. The ORP, pH, DO, and MLSS meters were used, which include some advantages of inexpensive, convienient, quic Two stages of the experiment have been conducted. The purpose of the first stage is to find the stable conditions for system operation. According to the result of the first stage,the results have shown that the characteristics of the system can be reflected adequately by using ORP、pH and DO to be as the automatic monitoring and control parameters. The end point of denitrification in anoxic phase, the end point of nitrification and the fully oxidation state of carbon source in aerobic phase can be determined by differentialing to the ORP and pH profiles. Furthermore, the F/M ratio of the system can be predicted by the ORP of the end point of denitification from the relation equation of ORP versus log(F/ M).