Fabrication and performance study of the radiative catalytic pad for flameless combustion of natural gas in different climate conditions

In the present study، fabrication and performance testing of a flameless catalytic pad has been investigated. The catalyst was prepared with 1g of H2PtCl6. 6H2O solved in 0. 5 liter solvent contains 50% water and 50% ethanol and sprayed on the alumina - silica fiber mat as the catalyst support. The wet pad was dried and calcined before usage. The performance of the heater was evaluated by design and fabrication of a test stand which was capable of measuring parameters such as temperature at surface and in depth of the catalyst layer، the amount of pollutants such as CO and NOx، flow rate and pressure of the fuel and surface air circulation in front of the pad. In addition، by placing the panel containing the pad in an environmental test chamber، the effect of different climate conditions in five cities of Iran، i. e.، Borojerd، Khalkhal، Lavan، Mahshahr and Puladshahr were investigated. Average surface temperature of the pad was measured about 350°C. No NOx was detected and CO emission of the burner was measured up to 5ppm. In Khalkhal conditions with the lowest temperature and humidity، the highest temperature at surface was recorded and the maximum CO emissions in Mahshahr with the highest temperature and humidity was about 3ppm. It was shown that increasing the fuel flow rate increases the surface temperature and CO emissions. It was also shown that an increase of environment temperature and humidity، increases the surface temperature.