Numerical Simulation Of C-type Direct-flow Burners’ Combustion In Pulverized Coal Furnace

Now the DC burner of pulverized coalburner is the most commonly used in the power plant boiler. The burner isan important part ofthe normal operation and the productionof power plant boiler. The gas-solid two-phaseflow and combustion in the furnace has played a crucial role for the research of combustionefficiencyandstudy of combustion stability. There have appeared new national regulations of thermal power plant in recent years.Thelow nitrogen combustionemissionhasbecome the key research object for the scientific researchinstitutionsand power plantactual production.In this paper,by means of the software CFD,themodelof singleC-type DCburner and its application in power plantboiler awre studied by numerical simulation.Firstly,in this paper,numerical simulation was carried out for the single C-typeDCburnerofpulverized coal particles. We can take a study of pulverized coal particlescombustion in the furnace and and get the temperature cloud chart forward the direction of ignitionjet.The pulverized coalcanform a C-shapecoal jetin the furnace through the C-type DCburner. And at its twoends, there are two smallflamefire areas, where the relativelysurface area is very big, and the relative concentration of pulverized coal is very high. Because of the big relative surface area, the two ends can deeply entrain the high-temperature gas, and form two smallflameignition zone, which can cause coaleasyignition and steady combustion.Secondly, in this paper, we have studied the influence of differenttipangles on the performance of C-typeburner. It can be found that,thetipangle is smaller,thesmallflame effect anddoubleignition effect of the tip is more obvious.Finally, in this paper, by the use of the RNGk-εturbulence model,we make the numerical simulationof coalcombustion and emission pollutant, according to the application of C-type DCburner a 300 MWpower plant boiler. C-type DC burner can improve theadvancing ignition of coal particle, and the effect of promoting the combustionefficiency and the combustion stability is obvious. Besides, ina certain extent, it also can promote thereduction of nitrogen oxide emissions.