Experimental Study And Numerical Simulation On High-heat And Swirling Gas Burner

The burner is the key facility to the furnaces. High-heat swirling gas burner is anew efficient gas burner which has high combustion flame temperature, short flamelength, well-distributed temperature, steady lighting source and lower NO_xdensity.Currently, it prompts the developing and application of the high quality, high efficiencyand clean energy and utilization that changes of energy structure, the enlargement ofpolicy of "coal to gas" and serious environmental pollution so that developing a newefficient gas burner and putting it into use has a very significance for energyconservation and environmental protection.Swirling combustion make the compounding process between high-temperaturecombustion product and fuel rapidly in recirculation region, and its steady lightingsource can make the flame steady. It flame temperature can reach at1200-1800℃.Swirling combustion is one of the efficient measures to reduce the NO_xemission load, and it can meet the requirement of some special heating technology. Ithas a compact Combustion Chamber, and it can control the flame shape, change theflame divergence angle and Range Change.The combustion flame is steady well. It has many obvious advantages, such asenergy conservation, high efficiency, lower pollution, rapid load change ability andadjustable flame momentum, so it widespread applies in heating advices, such asnormalizing furnace, anneal burner and Die forging furnace, and in heating technologyabout metal material and parts.Firstly，I analyses the developments of the swirling combustion technology, andelaborates the basic theory of swirling combustion. Secondly, an experimental industrialgas burner has been designed and set up in combination with relevant knowledge. Lastly,heat combustion experiment of five experimental condition is tested on the basis of thehigh-heated swirling disc burner. It mainly researches the influence of the differentthermal load and excess air coefficient α on combustion characteristics, recirculationregion, temperature uniform it and NO_xconcentration of the gas burner. The results ofheat combustion experiment show that: in different thermal load and differentexperimental condition, the high-heated swirling gas burner can stably burn, and it has abig load ratio. With the increase of heat load, the corresponding flame test pointtemperature rise; When the heat load is in a certain, the lager the excess air coefficient is,the smaller the flame volume becomes, the shorter the flame length becomes, andvise verse. So we can control the flame temperature and the flame length to meet somespecial process need through adjusting the heat load and excess air coefficient. Whenthe excess air coefficient is bigger, the NO and NO_xconcentration in the trail gas issmaller as the heat load is in a certain, and vise verse. The change law is similar to thechange curve of the flame temperature. And the change of the O₂concentration in thetrail gas is same to the change of the excess air coefficient.On the basis of experiment, under the condition of the selected experimentalcondition, Methane/air non-premixed combustion process has been studied with thenumerical simulator soft-ware Fluent. Using Reynolds standard k-simulation andsimplify PDF combustion model to study the combustion process. Through numericalsimulation on non-premixed combustion process in the combustion chamber,calculating the flow field, the temperature field and the NO_xconcentration field,itsresults is consistent with the experiment results in the trend. It shows that numericalsimulation has certain guiding significance to the swirling combustion research.