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Show Riley Stoker has conducted NOx emission testing on 26 utility and industrial Turbo furnaces (4,5,6). These tests have shown that changes in secondary air vane position can affect NOx by 15%. Similarly staged combustion reduces NOx by about 15% (4,5,6). In light of this data, changing burner settings appears to have a greater effect in the single burner facility than in the opposed fired downward tilt Turbo furnace. This indicates that furnace mixing in the Turbo furnace may have a large effect on N0X emissions. TSV BURNER The TSV burner, shown in Figure 10, is stabilizied by recirculation achieved at a medium swirl number. This burner was designed so that the stoichiometric ratio of the secondary air in the burner throat (SRD) could be D reduced to 0.4. The secondary air is admitted into a narrow annulus through register vanes which swirl the air. This burner does not have an expanding quarrel, so that the burner throat is flush with the burner front. The TSV burner incorporates the CCV burner coal nozzle design. Tertiary air ports equipped with directional turning vanes are positioned near the burner throat. These tertiary air ports are used to bring the total burner front stoichiometry (SRgF) up to 0.7-1.0. The remainder of the air was added through the downstream air staging ports. The burner adjustments used on the TSV burner were register vane position, axial coal spreader position, and the angle of the tertiary air turning vanes. Coal spreader design was also optimized during the TSV burner testing. With the final spreader design the flame was very well rooted at the coal nozzle for register vane positions less than 25°. NO emissions were lowest at a register vane position of 25°. The swirl number measured during the aerodynamic model testing at this setting was 0.6. As the register vanes were opened, swirl decreased, the flame front began to stand off the burner, and NO emissions increased from 300 ppm to 500 ppm. The position of the final coal spreader also had an effect on NO . NO emissions dropped 12 |
