Kinetic analysis of diffusion combustion of low calorific value gas under the action of thermal dynamics

At present, a large number of low calorific value gases are directly discharged, which will not only pollute the environment, but also wastes resources. In view of the difficulty in burning low calorific value gas, based on the numerical simulation software Fluent, this paper studies the reaction kinetics of diffusive combustion of low calorific value gas under the action of thermal dynamics, and analyzes the distribution of the gas concentration field in the furnace, the reaction turbulent rate and the reaction equivalent ratio change of the combustion reaction of CH4, CO, H-2 in the blast furnace gas as well. The results show that the air preheating temperature increases, the O-2 concentration decreased and the CO concentration increases. On the same cross section, as the air preheating temperature increases, the reaction turbulence of CH4 decreases. When Ta = 350 K, the turbulent rate of the combustion reaction of CO and H-2 reaction in the complete combustion stage is the largest, turbulent rates are 6.68698E-5 and 2.8484E-7, respectively. With the increase of air preheating temperature, the higher the reaction equivalent ratio of the combustion reaction of CH4, CO and H-2. When Ta = 450 K, the change trend of the reaction equivalent ratio of the three combustion reactions of CH4, CO and H-2 is the same, the minimum peak values are 1.42458, 3.22563 and 0.72694, respectively, and the reaction equivalent ratio of CO is the highest. At this temperature, the complete combustion of the CO component in the low calorific value gas can be promoted.