40 C.F.R. § 1065.675

Current through October 31, 2024

Section 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 intake 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:

View Image

Where:

quench = amount of CLD quench.

[XI]_NOdry = concentration of NO upstream of a humidity generator, according to § 1065.370(e)(4) .

[XI]_NOwet = measured concentration of NO downstream of a humidity generator, according to § 1065.370(e)(9) .

[XI]_H2Oexp = maximum expected mole fraction of water during emission testing, according to paragraph (b) of this section.

[XI]_H2Omeas = measured mole fraction of water during the quench verification, according to § 1065.370(e)(7) .

[XI]_NOmeas = measured concentration of NO when NO span gas is blended with CO₂ span gas, according to § 1065.370(d)(10) .

[XI]_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.

[XI]_CO2exp = maximum expected concentration of CO₂ during emission testing, according to paragraph (c) of this section.

[XI]_CO2act = actual concentration of CO₂ when NO span gas is blended with CO₂ span gas, according to § 1065.370(d)(9) .

View Image

Where:

[XI]_NOspan = the NO span gas concentration input to the gas divider, according to § 1065.370(d)(5) .

[XI]_CO2span = the CO₂ span gas concentration input to the gas divider, according to § 1065.370(d)(4) .

Example:

[XI]_NOdry = 1800.0 [MICRO]mol/mol

[XI]_NOwet = 1739.6 [MICRO]mol/mol

[XI]_H2Oexp = 0.030 mol/mol

[XI]_H2Omeas = 0.030 mol/mol

[XI]_NOmeas = 1515.2 [MICRO]mol/mol

[XI]_NOspan = 3001.6 [MICRO]mol/mol

[XI]_CO2exp = 3.2%

[XI]_CO2span = 6.1%

[XI]_CO2act = 2.98%

View Image

quench = (-0.0036655-0.014020171) · 100% = -1.7685671%

40 C.F.R. §1065.675

73 FR 59340 , Oct. 8, 2008, as amended at 76 FR 57466 , Sept. 15, 2011; 81 FR 74188 , Oct. 25, 2016; 86 FR 34568 , June 29, 2021; 88 FR 4686 , Jan. 24, 2023

81 FR 74188, 12/27/2016; 86 FR 34568, 6/29/2021; 88 FR 4686, 3/27/2023