Perform CLD quench-check calculations as follows:
(a) Perform a CLD analyzer quench verification test as described in Sec. 1065.370.
(b) Estimate the maximum expected mole fraction of water during emission testing, xH2Oexp. Make this estimate where the humidified NO span gas was introduced in Sec. 1065.370(e)(6). When estimating the maximum expected mole fraction of water, consider the maximum expected water content in combustion air, fuel combustion products, and dilution air (if applicable). If you introduced the humidified NO span gas into the sample system upstream of a sample dryer during the verification test, you need not estimate the maximum expected mole fraction of water and you must set xH2Oexp equal to xH2Omeas.
(c) Estimate the maximum expected CO2 concentration during emission testing, xCO2exp. Make this estimate at the sample system location where the blended NO and CO2 span gases are introduced according to Sec. 1065.370(d)(10). When estimating the maximum expected CO2 concentration, consider the maximum expected CO2 content in fuel combustion products and dilution air.
(d) Calculate quench as follows: [GRAPHIC] [TIFF OMITTED] TR15SE11.077 Where: quench = amount of CLD quench.xNOdry = concentration of NO upstream of a bubbler, according
to Sec. 1065.370(e)(4).xNOwet = measured concentration of NO downstream of a
bubbler, according to Sec. 1065.370(e)(9).xH2Oexp = maximum expected mole fraction of water during
emission testing, according to paragraph (b) of this section.xH2Omeas = measured mole fraction of water during the quench
verification, according to Sec. 1065.370(e)(7).xNOmeas = measured concentration of NO when NO span gas is
blended with CO2 span gas, according to Sec.
1065.370(d)(10).xNOact = actual concentration of NO when NO span gas is
blended with CO2 span gas, according to Sec.
1065.370(d)(11) and calculated according to Equation 1065.675-
2.xCO2exp = maximum expected concentration of CO2
during emission testing, according to paragraph (c) of this
section.xCO2act = actual concentration of CO2 when NO span
gas is blended with CO2 span gas, according to
Sec. 1065.370(d)(9).
[GRAPHIC] [TIFF OMITTED] TR15SE11.078
Where: xNOspan = the NO span gas concentration input to the gas
divider, according to Sec. 1065.370(d)(5).xCO2span = the CO2 span gas concentration input to
the gas divider, according to Sec. 1065.370(d)(4). Example: xNOdry = 1800.0 [micro]mol/molxNOwet = 1739.6 [micro]mol/molxH2Oexp = 0.030 mol/molxH2Omeas = 0.030 mol/molxNOmeas = 1515.2 [micro]mol/molxNOspan = 3001.6 [micro]mol/molxCO2exp = 3.2%xCO2span = 6.1%xCO2act = 2.98%[GRAPHIC] [TIFF OMITTED] TR15SE11.079 quench = (-0.0036655-0. 014020171)[sdot]100% = -1.7685671% [73 FR 59340, Oct. 8, 2008, as amended at 76 FR 57466, Sept. 15, 2011]