# Title 40

## SECTION 1065.675

### 1065.675 CLD quench verification calculations.

§ 1065.675 CLD quench verification calculations.Perform CLD quench-check calculations as follows:

(a) Perform a CLD analyzer quench verification test as described in § 1065.370.

(b) Estimate the maximum expected mole fraction of water during
emission testing, *x*H2Oexp. Make this estimate where the
humidified NO span gas was introduced in § 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 *x*H2Oexp equal to *x*H2Omeas.

(c) Estimate the maximum expected CO2 concentration during
emission testing, *x*CO2exp. Make this estimate at the sample
system location where the blended NO and CO2 span gases are
introduced according to § 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:

Where:*quench*= amount of CLD quench.

*x*NOdry = concentration of NO upstream of a bubbler, according to § 1065.370(e)(4).

*x*NOwet = measured concentration of NO downstream of a bubbler, according to § 1065.370(e)(9).

*x*H2Oexp = maximum expected mole fraction of water during emission testing, according to paragraph (b) of this section.

*x*H2Omeas = measured mole fraction of water during the quench verification, according to § 1065.370(e)(7).

*x*NOmeas = measured concentration of NO when NO span gas is blended with CO2 span gas, according to § 1065.370(d)(10).

*x*NOact = actual concentration of NO when NO span gas is blended with CO2 span gas, according to § 1065.370(d)(11) and calculated according to Eq. 1065.675-2.

*x*CO2exp = maximum expected concentration of CO2 during emission testing, according to paragraph (c) of this section.

*x*CO2act = actual concentration of CO2 when NO span gas is blended with CO2 span gas, according to § 1065.370(d)(9). Where:

*x*NOspan = The NO span gas concentration input to the gas divider, according to § 1065.370(d)(5).

*x*CO2span = the CO2 span gas concentration input to the gas divider, according to § 1065.370(d)(4). Example:

*x*NOdry = 1800.0 µmol/mol

*x*NOwet = 1739.6 µmol/mol

*x*H2Oexp = 0.030 mol/mol

*x*H2Omeas = 0.030 mol/mol

*x*NOmeas = 1515.2 µmol/mol

*x*NOspan = 3001.6 µmol/mol

*x*CO2exp = 3.2%

*x*CO2span = 6.1%

*x*CO2act = 2.98%

*quench*= (−0.0036655−0.014020171)·100% = −1.7685671% [73 FR 59340, Oct. 8, 2008, as amended at 76 FR 57466, Sept. 15, 2011; 81 FR 74188, Oct. 25, 2016]