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http://dx.doi.org/10.9713/kcer.2021.59.1.77

Control of Hot Spots in Plug Flow Reactors Using Constant-temperature Coolant  

Rhyu, Jinwook (Department of Chemical and Biological Engineering, Seoul National University)
Kim, Yeonsoo (Department of Chemical Engineering, Kwangwoon University)
Lee, Jong Min (Department of Chemical and Biological Engineering, Seoul National University)
Publication Information
Korean Chemical Engineering Research / v.59, no.1, 2021 , pp. 77-84 More about this Journal
Abstract
To control hot spot in a plug flow reactor (PFR) is important for the yield and purity of products and safety. In this paper, coolant temperature is set as a state variable, and radial distributions of heat and mass are considered to model the PFR more realistic than without considering radial distributions. The model consists of three state variables, reactant concentration, reactant temperature, and the coolant temperature. The flow rate of the isothermal coolant is a manipulated variable. This paper shows that the controller considering the radial distributions of heat and mass is more effective than the controller without them. Assuming that u3,0 is 0.7, the suggested control equation was robust when St is bigger than 1.3, and Ac/A is smaller than 2.0. Under this condition, the hot spot temperature changed within the relative error of one percent when the temperature of input altered within the range of five percent.
Keywords
Hot spots; Plug flow reactors; Nonlinear control; Radial distribution;
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