DOI: 10.5281/zenodo.7255059
title: Chemical reactors with enhanced heat transfer for conducting simultaneous endothermic and exothermic reactions

description: <strong>Chemical reactors with enhanced heat transfer for conducting simultaneous endothermic and exothermic reactions</strong> Junjie Chen Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com Many chemical processes utilize catalysts to enhance chemical conversion behavior. A catalyst promotes the rate of chemical conversion but does not affect the energy transformations which occur during the reaction. Often catalytic processes are conducted within tubes which are packed with a suitable catalytic substance. The process gas flows within the tube and contacts the catalytic packing where reaction proceeds. The tube is placed within a hot environment such as a furnace such that the energy for the process can be supplied through the tube wall via conduction. The mechanism for heat transfer with this arrangement is rather tortuous as heat must first be transferred through the outer boundary layer of the tube, conducted through the often-heavy gauge wall of the tube and then pass through the inner boundary layer into the process gas. The process gas is raised in temperature and this energy can be utilized by the process for chemical reaction. The process engineer is often caused to compromise between the pressure drop within the tube reactor with the overall heat transfer and catalytic effectiveness. The inner heat transfer coefficient can be effectively increased by raising the superficial velocity of the process gas. The higher gas velocity therefore improves the thermal effectiveness of the system. However, higher gas velocities increase the system's pressure drop and results in increased compressor sizes and associated operating costs. Streamwise distance (meters), Heat flux (watts per square meter) 0 27306.2 0.00025 124496 0.0005 117728 0.00075 106208 0.001 94912 0.00125 85088 0.0015 76704 0.00175 69488 0.002 63200 0.00225 57712 0.0025 52832 0.00275 48528 0.003 44704 0.00325 41264 0.0035 38144 0.00375 35344 0.004 32912 0.00425 30720 0.0045 28688 0.00475 26832 0.005 25184 0.00525 23664 0.0055 22272 0.00575 21056 0.006 19952 0.00625 18912 0.0065 17936 0.00675 17072 0.007 16288 0.00725 15568 0.0075 14864 0.00775 14240 0.008 13728 0.00825 13216 0.0085 12752 0.00875 12304 0.009 11840 0.00925 11472 0.0095 11168 0.00975 10832 0.01 10448 0.01025 10128 0.0105 9952 0.01075 9776 0.011 9472 0.01125 9232 0.0115 9136 0.01175 8832 0.012 8640 0.01225 8688 0.0125 8576 0.01275 8432 0.013 8320 0.01325 8192 0.0135 8016 0.01375 7904 0.014 7840 0.01425 7728 0.0145 7648 0.01475 7552 0.015 7488 0.01525 7440 0.0155 7360 0.01575 7312 0.016 7248 0.01625 7184 0.0165 7104 0.01675 7024 0.017 6992 0.01725 7008 0.0175 7008 0.01775 6928 0.018 6880 0.01825 6880 0.0185 6800 0.01875 6720 0.019 6720 0.01925 6704 0.0195 6640 0.01975 6592 0.02 6624 0.02025 6592 0.0205 6496 0.02075 6464 0.021 6512 0.02125 6528 0.0215 6448 0.02175 6384 0.022 6384 0.02225 6320 0.0225 &nb
description: Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: komcjj@gmail.com, Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China