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Cody Park Thesis Final 7_13_2018.pdf (3.96 MB)

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Sliding Mode Control and Electrical Capacitance Volume Tomography for Advanced Control of the Chemical Looping Process

Park, Cody
http://rave.ohiolink.edu/etdc/view?acc_num=osu153148162698589

Abstract Details

2018, Master of Science, Ohio State University, Chemical Engineering.
The chemical looping process is a novel process platform capable of efficiently converting fossil fuels to energy or chemical products with in-situ carbon capture. The process may be designed for a variety of fuel feedstocks, from coal and biomass to natural gas, and can yield a flexible range of products such as syngas and electricity. In the process, a metal oxide oxygen carrier oxidizes a fuel source by providing lattice molecular oxygen in one reactor. The depleted oxygen carrier is transported to a second reactor where it is re-oxidized with air and transported back to the first reactor in a cyclic manner. The process then results in a pure product or flue gas stream while circumventing the need for air separation units or carbon separation units associated with other carbon capture techniques. As the chemical looping platform approaches commercial deployment, the need for an advanced process control architecture is made evident. Experience from operation of several sub-pilot and pilot scale units by The Ohio State University has revealed that the operating parameters of the chemical looping process are highly intertwined and non-linear in nature. In particular, transient state changes experienced during start-up and shut-down of the process is particularly difficult and will only grow increasingly complex as the process is scaled up. The purpose of this work is then to develop control techniques, algorithms, and architecture for controlling the chemical looping process. Sliding Mode Control is investigated as a superior alternative to classical control methods for non-linear control loops in terms of both control properties as well as ease of implementation. The controllers are tested and compared against Proportional-Integral control for regulation of the system pressure, pressure balance, non-mechanical gas seals, and solids circulation rate of a Syngas Chemical Looping sub-pilot unit. The start-up, fuel injection, and shut-down procedures are automated and tested multiple times in the sub-pilot unit, enabling complete automation of the process. Electrical Capacitance Volume Tomography technology is developed as an option for monitoring the solids circulation rate in the chemical looping system, a critical parameter for precise control of the process. Electrical Capacitance Volume Tomography is a non-intrusive, non-invasive process flow measurement technique, capable of providing real-time volume images of two phase flow systems. In this work, experiments and data analysis methods are developed for the imaging and measuring of packed moving bed flow at ambient conditions and elevated temperatures. A method is developed for measuring mass flow and flux through a sensing region. Finally, future work for advanced control development and Electrical Capacitance Volume Tomography is proposed.
Andrew Tong, Dr. (Advisor)
Andre Palmer, Dr. (Committee Member)
106 p.
Chemical Engineering
Electrical Capacitance Volume Tomography; Chemical Looping; Sliding Mode Control

Recommended Citations

Citations

  • Park, C. (2018). Sliding Mode Control and Electrical Capacitance Volume Tomography for Advanced Control of the Chemical Looping Process [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu153148162698589

    APA Style (7th edition)

  • Park, Cody. Sliding Mode Control and Electrical Capacitance Volume Tomography for Advanced Control of the Chemical Looping Process. 2018. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu153148162698589.

    MLA Style (8th edition)

  • Park, Cody. "Sliding Mode Control and Electrical Capacitance Volume Tomography for Advanced Control of the Chemical Looping Process." Master's thesis, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu153148162698589

    Chicago Manual of Style (17th edition)

osu153148162698589
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This open access ETD is published by The Ohio State University and OhioLINK.