Abstract
In this study the NOx reduction capability of reburning three biomasses (i.e., wood pellet, torrefied biomass, and empty fruit bunch) via 12 cases (i.e., four reburning ratios for every biomass) is investigated in a 1 MWth-scale pilot-scale furnace. These reburning cases are compared with 12 cofiring cases presented in the Part 1 paper on a consistent basis. It is found that, for every cost to purchase and prepare biomass, reburning technology provides significantly better NOx abatement performance than cofiring (up to 3.4 times). NOx reduction effectiveness as high as 4.9 could be achieved by reburning, which means the percent of NOx abatement could be 4.9 times higher than the percent of reburning ratio. It is found that the highest NOx reduction per thermal unit of biomass happens at the lowest reburning ratio, and increasing the reburning ratio leads to a reduction in NOx abatement effectiveness in an exponential decay manner. Unlike cofiring technology, reburning was found to have little dependence on the fuel characteristics, such as fuel ratio or fuel-N, when it comes to NOx abatement potential.
Highlights
Reducing nitrogen oxides (NOx) emission is one of the major issues in most combustion systems
Even though the level of air staging between burner/reburn port and overfire air is constant for all cases, increasing the reburning/cofiring ratio leads to an increase in volatile matter in the oxygen-deficient zones
Figure for typesand andreplacement replacementratios ratiosofofthe thebiomasses. Another remarkable point is the fact that NOx reduction effectiveness by increase in biomass reburning an exponential behavior
Summary
Reducing nitrogen oxides (NOx) emission is one of the major issues in most combustion systems. In the second stage of fuel conversion (i.e., char combustion), char-N reacts with oxygen and produces NOx. While usually 20 percent of total fuel-N is nested in char [6], it is the factor that limits the NOx reduction capability of primary NOx measures, such as low-NOx burner and air staging [7,8]. While usually 20 percent of total fuel-N is nested in char [6], it is the factor that limits the NOx reduction capability of primary NOx measures, such as low-NOx burner and air staging [7,8] This share of fuel-N is the main source of NO emission in coal power plants
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