(1) The volumetric flow rates at the inlet and outlet of the wet scrubber and the inlet CO2 concentration may be used to determine the adjusted CO2 concentration [(%CO2)adj] using the following equation: (%CO2)adj = (%CO2)di (Qdi/Qdo)
where:
(%CO2)adj = adjusted outlet CO2 concentration, percent dry basis.
(%CO2)di = CO2 concentration measured before the scrubber, percent dry basis.
Qdi = volumetric flow rate of effluent gas before the wet scrubber, dscm/min (dscf/min).
Qdo = volumetric flow rate of effluent gas after the wet scrubber, dscm/min (dscf/min).
(i) At the outlet, Method 5 is used to determine the volumetric flow rate (Qdo) of the effluent gas.(ii) At the inlet, Method 2 is used to determine the volumetric flow rate (Qdi) of the effluent gas as follows: Two full velocity traverses are conducted, one immediately before and one immediately after each particulate run conducted at the outlet, and the results are averaged.(iii) At the inlet, the emission rate correction factor, integrated sampling and analysis procedure of Method 3B is used to determine the CO2 concentration [(%CO2)di] as follows: At least nine sampling points are selected randomly from the velocity traverse points and are divided randomly into three sets, equal in number of points; the first set of three or more points is used for the first run, the second set for the second run, and the third set for the third run. The CO2 sample is taken simultaneously with each particulate run being conducted at the outlet, by traversing the three sampling points (or more) and sampling at each point for equal increments of time.(2) Excess air measurements may be used to determine the adjusted CO2 concentration [(%CO2)adj] using the following equation: (%CO2)adj = (%CO2)di [(100 + %EAi)/(100 + %EAo)]
where:
(%CO2)adj = adjusted outlet CO2 concentration, percent dry basis.
(%CO2)di = CO2 concentration at the inlet of the wet scrubber, percent dry basis.
%EAi = excess air at the inlet of the scrubber, percent.
%EAo = excess air at the outlet of the scrubber, percent.
(i) A gas sample is collected as in paragraph (c)(1)(iii) of this section and the gas samples at both the inlet and outlet locations are analyzed for CO2, O2, and N2.(ii) Equation 3B-3 of Method 3B is used to compute the percentages of excess air at the inlet and outlet of the wet scrubber.