Experimental Research On Natural Gas Of U-type Tube Using High Temperature Air Combustion

High temperature air combustion has many advantages such as lower flame peak temperature, uniform temperature distribution, lower oxidation loss, lower CO emission and NOx emission. It is a new way to use HTAC in natural gas furnace. The new type furnace contains the advantages of HTAC and natural gas. The researches on its physical and chemical characteristics, dispersion combustion inside the furnace can improve the control level on NOx and CO emission and energy saving in the combustion process and promote the sustained development of society and economy in our country.In this paper, the technology of High Temperature Air Combustion(HTAC) and its advantages in technology and developing trend are systematically analyzed. The ways to obtain low oxygen condition for HTAC are also systematically analyzed. The Flue Gas Recirculation(FGR) is widely used to reduce NOx emission, and it is the most useful technology to reach low oxygen condition. So the technology of FGR was used in this paper. This paper does study on effect of FGR to temperature distribution in the furnace and gets rules of NOx and CO's emission, as well as makes sure the oxygen's remains concentration, and does some experimental studies on relations of emission to heating load and gets rules of it.In this thesis, experimental method was used to study the effect of FGR parameters and operation parameters on temperature distribution and NOx emission. The preheat air temperature of this system is above 700℃and the exhaust gas released into the atmosphere is lower than 150℃. The combustion experiments were carried out to get the data of temperature distribution and NOx emission in high temperature air combustion process. Experimental results were used to validate the guidance used in the engineering.