Numuerical Simulation Analysis Of The Gas Industrial Furnace Swiling Combustion And NO_x Generation

Along with the development of the gas industry, especially the development ofnatural gas industry, gas has been widely used in metallurgy, machinery, chemicalindustry, building materials, light industry and food industries as well. Also, theconsciousness of energy conservation and environmental protection is graduallystrengthened. Fuel combustion efficiency improvement and reduction of flue gaspollutants generation are concerned and become an important research topic. The vortexcombustion technology can increase the gas and air uniformity, promote the combustionreaction and prevent local high temperature. At the same time by the action of vortex，backflow area can be made which can reduce the combustion temperature andconcentration of oxygen area and effectively reduce NO_xproduction. On the basis ofanalysis and reference for the related literature at home and abroad, gas industrialfurnace swirling combustion is researched.With the utilization of commercial fluid numerical simulation software FLUENT，the geometric model of a gas heating furnace is established. Based on a lot of researchliterature，the standard k-εprocess turbulent flow model, PDF combustion model,P-1radiation model and NO_xformation model (the model is solved to NO_xcontrolequation the after the completion of the simulation of burning question, which is calledpost-processing method) are chosen. The numerical simulation for furnace vortexcombustion and NO_xgeneration under different swirling number and excess aircoefficient circumstance is made and the corresponding results are draw as well.The results of the analysis shows that the furnace temperature field influenced bythe vortex number and excess air coefficient increase at first and then reduce and bothinfluence is independent of each other. In the actual application of rotary flow throughby regulating the size or adjust the air supply to change of the flame of partial long orpartial short, furnace of the temperature too high or low; With the improvement of thevortex number, the concentration of the NO_xgradually declines，while，with the increaseof the excess air coefficient the concentration of the NO_xfirst rise and then have adownward trend. The both effect influences each other. In the actual applicationprocess，improving vortex number to reduce NO_xgeneration can be chosen，in the caseof ensuring the furnace temperature to increase the amount of air.