Nonuniformity of Temperature Distributions of Flue Gas Temperature over the Depth of a Tube Furnace

The influence of a three-dimensional change in the parameters of flue gases on the distributions of temperatures and radiant heat fluxes in the radiant chamber of a tubular furnace is investigated. The external heat and mass transfer in the radiant chamber of the furnace is modeled by three-dimensional differential equations of energy, radiation transfer, motion, continuity, k–ε turbulence model, and two-step model of methane combustion. To solve the equation of radiation transfer, the method of discrete ordinates is used. Areas with the highest temperature gradients are identified.