Research On Low No_x Emission Of Natural Gas Regenerative Tyre Boiler And Energy Saving Optimization

At present,environmental issues such as haze and global warming are increasingly prominent,and China's energy development strategy is to save energy.In Shandong,where industry accounts for a high proportion of GDP,it is vigorously advancing the conversion of new and old kinetic energy to major projects.Under such circumstances,improving product quality in the industry is particularly important for energy saving and emission reduction.This article uses clean energy-natural gas as raw material and an industrial furnace-kiln trolley as the experimental platform to study its energy-saving and NO_x emission levels,and proposes more effective combustion methods and lower levels of NO_x Emissions plan to achieve a good effect of energy saving and emission reduction.Firstly,in this paper,experimental research is used to design and build a complete set of heat storage kiln trolley furnace experimental bench,including its combustion system,air supply and exhaust system,heat exchange system and data acquisition system.Secondly,the pressure,flow rate,and temperature debugging tests were performed on the test bench.For the burn-out problems of the burners that occurred in the test,a heat supply program using intermittently supplied with a large load was proposed to effectively solve the practical problems.Then,a detailed thermal equilibrium analysis was conducted on the entire experimental bench,and the energy saving method of the trolley was proposed,ie continuous work,minimizing the heating time to solve the door seal and selecting a more lightweight trolley support material,so thatthe thermal efficiency?can reach more than 85%.Finally,the problem of high NO_x emission in the experiment is elicited and solved by theoretical analysis and numerical simulation.Through theoretical analysis,this paper has detailedly deduced the mechanism of NO_x generation,identified various factors affecting NO_x production,then modeling and numerical simulation analysis was carried out on the test bench,and the experimental data was used to verify the numerical simulation model.Errors were within 10%,and the correctness of the numerical simulation was confirmed.In this paper,a part of the flue gas external circulation to the combustion chamber to solve the problem of high NO_x emissions,using numerical simulation methods.The supply of recycled flue gas is divided into two schemes:one is evenly mixed with air;the other is non-uniform mixing,direct injection into the combustion chamber through the flue gas distribution cavity.The author combines the two schemes,firstly proposed a circulating flue gas segmented auxiliary combustion system to reduce the NO_x emission level to below 24 ppm,which meets the emission limit standards required by the latest design specifications.In terms of structural optimization,the authors studied the diameter d₂ of the combustion chamber and determined its optimal structure size,d₂=150mm,which maximizes the combination of actual and reduced NO_x emissions.