Johnston U. Chapel Hill Rd. Mention of trade names or commercial products is not intended to constitute endorsement or recommendation for use. Page ' '. Methods of control, both through combustion modifications and add-on controls, are available but have been infrequently applied to MWC's. The various control technologies for reducing NO emissions are reviewed in 'Β».
The available performance data and operational experience for the different NO controls for MWC's are also presented. A cursory cost analysis for selective catalytic reduction SCR is also presented. In Section 5. The sensitivity of Thermal DeNO annualized costs and cost effectiveness to variations in ammonia and electricity costs is also investigated. Od Without these points, the average N0x concentration still rounds to ppm.
With this point, the average NOX concentration stilT rounds to ppm. Excludes one atypical data point of ppm. With this point included, the average NO concentration is ppm. A eExcludes one atypical data point of ppm for a modular starved-air facility. With this point included, the average is ppm. For excess-air modular units, the Β« NOX emissions average ppm and range from to ppm. For modular starved-air facilities including the ppm ] emission rate from Cattaraugus , the average NOX concentration is ppm.
The ppm value recorded in June was from Commerce, which burns primarily commercial refuse. Insufficient data are available for the other combustor types to determine similar trends. Previous investigations of NOV emissions from coal-, oil-, and gas-fired 43 utility boilers have found that combustor load can affect NO emissions.
In addition, at Marion County and Quebec City, NO emissions were measured at " ' - ' different excess air rates and overfire air distributions. These data are summarized in Table During the Marion County tests, the NOX emissions at low load and normal air supply 76 percent of full load, Run 6a averaged ppm at 7 percent 02 while the five tests at normal load and normal air supply Runs 1, 2, 10, lla, lib averaged ppm at 7 percent 02, a difference of about 10 percent.
