Modeling of oxygen combustion of natural gas in boilers

In order to implement international climate agreements at the supranational and national levels, various measures are being used to stimulate, among other things, the technological transition of energy from generation based on hydrocarbons and other fuels to carbon-free energy resources and energy resources with low greenhouse gas emissions. In this paper, the results of mathematical modeling of natural gas combustion for a fire-tube boiler in air and in a mixture of air with a recirculated flow of carbon dioxide enriched with oxygen are considered. The study of oxygen combustion of natural gas was carried out when air was replaced with pure oxygen in the range from 0 to 100 % of its demand. Part of the carbon dioxide produced is proposed to be recycled into the furnace, and the second part for technological needs for injection into the reservoir, further liquefaction and sale or storage. The dependence of the efficiency of the equipment, the temperature of the exhaust gases, the volume of CO2, NOx, H2O emissions on the volume fraction of oxygen in the fuel-air mixture is investigated. Conclusions are drawn about the most effective modes of operation of the equipment based on environmental and energy criteria. The results obtained indicate the prospects for continuing work in this area to reduce greenhouse gas emissions into the environment.