Experimental study on heat transfer characteristics of H-type finned tube in ceramic packed bed

Based on the heat extraction process of coal mine VAM thermal oxidation with embedded finned heat ex-changer,the steady state heat extraction experimental platform was built. Heat transfer characteristics of H-type finned tube in a narrow space enclosed by ceramic porous medium and the contribution of heat transfer mode to the heat transfer coefficient of H-type finned tube by the method of plating silver on the outer surface were studied experimen-tally. The maximum temperature on the edge of the H-type finned tube increased 264 degree centigrade with the in-crease of the inlet temperature,and changed only 35 degree centigrade with the increase of the Reynolds number. The temperature of the tube wall of the base tube changed little with the increase of the inlet temperature and the Reynolds number. Honeycomb ceramic could strengthen the heat radiation of H-type finned tube and the heat loss was reduced by 29. 8% ,but inhibit the convection heat transfer to a certain extent. The radiation heat transfer contribution degree increased from 48. 17% to 60. 34% with the increase of inlet temperature and reduced from 57. 2% to 55. 35% with the increase of Re. The experimental data were inductively analyzed,leading to an experimental correlation of heat transfer characteristics of H-type finned tube in the ceramic oxidation bed.