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Show MMBtulhr. However, this kind of behavior is not as pronounced with natural gas used as the support fuel. 5.2 Commercial Burner Performance Overall performance of the commercial burners installed at Grayson Units 3 and 4 surpasses that achieved by the prototype burner. In addition to achieving equally stable flames, the commercial burners exhibit better emissions performance, as presented in Figures 8 and 9 for Units 3 and 4, respectively. For LFG along with minimum natural gas support, Le., at 14 MW net, .NOx emissions are roughly 11 ppm (@ 3 ~ O2, dry) for both units. At a higher load, LFG is supplemented with natural gas. As the ratio of natural gas to LFG increases, NOx emissions also increase. For instance, NOx emissions were measured at 20 ppm (@ 3 % O2, dry) at 18 MW net for Grayson Unit 3 while 30 ppm NOx (@ 3 ~ O2, dry) was reported at 41.5 MW net for Grayson Unit 4. 6.0 CONCLUSIONS The development and implementation of a low NOx LFG burner system for the Grayson generating station marks a technological and commercial milestone. The project allowed the recovery of a valuable fuel source to produce clean electric energy. It simultaneously offered resource and energy conservation and environmental compliance. From a technical perspective, the burner development focused on producing stable flames while achieving low NOx conditions. The development approach, as described in this paper, consisting of conceptual design, intensive analytical modeling, and verification and optimization of performance via prototype burner testing proved to be a commercial success. The burner built using this criteria has achieved ultra low NOx emissions -16- |
