Attaining a NO{sub}x level of 0.15Ib/10{sup}6 Btu on a 700MW lignite-fired boiler using combustion modifications

摘要

Pirkey no. 1 is a 700MW boiler firing Texas lignite and is required to meet the State of Texas NO{sub}x limit of 0.165 lb/10{sup}6 Btu. In early 2001 ABT was awarded a contract for the supply of a full complement of 56 Opti-flow Mark II low NO{sub}x burners and overfire air. This paper describes the project scope, furnace/OFA modeling, OFA and burner design to meet the plant's overall needs; among which is reliable operation of the combustion system with the extremely erosive nature of Texas lignite. NO{sub}x levels of 0.15 lb/10{sup}6 Btu are being attained with CO levels below 100ppm and with no adverse impacts to boiler performance or efficiency.