Modelling and L1 Adaptive Control of Temperature in Biomass Pretreatment

Remus Mihail Prunescu, Mogens Blanke, Gürkan Sin

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Abstract

Biomass steam pretreatment is a key process in converting agricultural wastes to bioethanol. The pretreatment occurs in a large pressurized tank called a thermal reactor. Two key parameters influence the successfulness of the process: the reactor temperature, and the retention time. A particle pump pressurizes untreated biomass from atmospheric to reactor pressure with recycled steam from the reactor. This paper formulates a steam mathematical model both for the thermal reactor and the particle pump, which is then used to design an L1 adaptive output feedback controller for the reactor temperature. As steam is recycled from the reactor to pressurize the particle pump, pressure drops and the reactor temperature is disturbed. The main control challenge is to reject these disturbances and keep a steady temperature. The nonlinear process model embeds mass and energy balances, valve characteristics, and enthalpy-pressure and pressure-temperature dependencies. Nonlinear feed-forward terms are added in the control strategy. The process model, the control strategy, the application of the L1 adaptive controller and its tuning method based on minimizing a cost function represent novelties of this paper.
Original languageEnglish
Title of host publicationProceedings of 52nd IEEE Conference on Decision and Control
PublisherIEEE
Publication date2013
Pages3152-3159
ISBN (Print)9781467357142
DOIs
Publication statusPublished - 2013
Event52nd IEEE Conference on Decision and Control (CDC 2013) - Congress Centre Firenze, Florence, Italy
Duration: 10 Dec 201313 Dec 2013
http://cdc2013.units.it/

Conference

Conference52nd IEEE Conference on Decision and Control (CDC 2013)
LocationCongress Centre Firenze
CountryItaly
CityFlorence
Period10/12/201313/12/2013
Internet address

Keywords

  • Computing and Processing

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