Contribution to the design of a pottery kiln using as fuel a mixture of cellulosic and plastic materials: Influence of the proportion of plastic on the emissions of NO, CO2, O2

Author(s): Salifou K.Ouiminga, Thomas Rogaume, Tizane Daho, Alfa Oumar Dissa, Samuel Ouoba, Jean Koulidiati

This paper presents a study of the influence of the proportion of polyethylene plastic, on the yields of gas emissions during the combustion of the mixture of “millet stalks and polyethylene plastic bags”, in a prototype of pottery kiln. During these investigations, we looked at the rate of residual oxygen (O2) and emissions of carbon dioxide (CO2) and nitrogenmonoxide (NO), as a function of primary air flow(Q1) and secondary airflow(Q2). The pottery kilns are considered as those powered by natural air flow. The primary air flows ranging from45 to 85 Nm3h-1 and secondary air flows from 20 to 60 Nm3h-1. To conduct this numerical study, the model used is “reactor ” based on the code CHEMKIN II. The modeled area is composed into amultitude of perfectly stirred reactors (PSR) and the kineticmodel has 893 species and 113 reversible chemical reactions. The results show that in our test conditions, the increasing of the rate of plastic in the mixture produces a decrease of the residual oxygen content, due to a higher oxygen consumption regardless of the airflow. The CO2 emissions are an increasing function of the rate of plastic (polyethylene) in the fuelmixture. Finally, NO emissions are increasing functions of the mass of plastic for a proportions less than or equal to 20%, and are essentially controlled by the temperature of the reactional medium.

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