Rc is the coke burn-off rate, Mg/hr (ton/hr)
Qr is the volumetric flow rate of exhaust gas from catalyst regenerator before entering the emission control system, dscm/min (dscf/min)
Qa is the volumetric flow rate of air to FCCU regenerator, as determined from the fluid catalytic cracking unit control room instrumentation, dscm/min (dscf/min)
%CO2 is the carbon dioxide concentration, percent by volume (dry basis)
%CO is the carbon monoxide concentration, percent by volume (dry basis)
%O2 is the oxygen concentration, percent by volume (dry basis)
K1 is the material balance and conversion factor, 2.982 x 10-4 (Mg-min)/hr-dscm-%) [9.31 x 10
-6 (ton-min)/(hr-dscf-%)]
K2 is the material balance and conversion factor, 2.088 x 10-3 (Mg-min)/(hr-dscm-%) [6.52 x 10
-5 (ton-min)/(hr-dscf-%)]
K3 is the material balance and conversion factor, 9.94 x 10-5 (Mg-min)/(hr-dscm-%) [3.1 x 10-6 (ton-min)/(hr-dscf-%)]
NR 440.26(7)(b)3.b.
b. The emission correction factor, integrated sampling and analysis procedure of Method 3B of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1), shall be used to determine CO
2, CO and O
2 concentrations.
NR 440.26(7)(c)
(c) If auxiliary liquid or solid fossil fuels are burned in an incinerator-waste heat boiler, the owner or operator shall determine the emission rate of PM permitted in
sub. (3) (b) as follows:
NR 440.26(7)(c)1.
1. The allowable emission rate (E
s) of PM shall be computed for each run using the following equation:
where:
Es is the emission rate of PM allowed, kg/Mg (lb/ton) of coke burn-off in catalyst regenerator
F is the emission standard, 1.0 kg/Mg (2.0 lb/ton) of coke burn-off in catalyst regenerator
A is the allowable incremental rate of PM emission, 7.5 x 10-4 kg/million J (0.10 lb/million Btu)
H is the heat input rate from solid or liquid fossil fuel, million J/hr (million Btu/hr)
Rc is the coke burn-off rate, Mg coke/hr (ton coke/hr)
NR 440.26(7)(c)2.
2. Procedures subject to the approval of the department shall be used to determine the heat input rate.
NR 440.26(7)(d)
(d) The owner or operator shall determine compliance with the CO standard in
sub. (4) (a) by using the integrated sampling technique of Method 10 to determine the CO concentration (dry basis). The sampling time for each run shall be 60 minutes.
NR 440.26(7)(e)1.1. The owner or operator shall determine compliance with the H2S standard in
sub. (5) (a) 1. as follows: Method 11, 15, 15A or 16 of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1), shall be used to determine the H2S concentration. The gases entering the sampling train should be at about atmospheric pressure. If the pressure in the refinery fuel gas lines is relatively high, a flow control valve may be used to reduce the pressure. If the line pressure is high enough to operate the sampling train without a vacuum pump, the pump may be eliminated from the sampling train. The sample shall be drawn from a point near the centroid of the fuel gas line.
NR 440.26(7)(e)1.a.
a. For Method 11, the sampling time and sample volume shall be at least 10 minutes and 0.010 dscm (0.35 dscf). Two samples of equal sampling time shall be taken at about 1-hour intervals. The arithmetic average of these 2 samples shall constitute a run.
NR 440.26 Note
Note:
For most fuel gas, sampling time exceeding 20 minutes may result in depletion of the collection solution, although fuel gases containing low concentrations of H2S may necessitate sampling for longer periods of time.
NR 440.26(7)(e)1.b.
b. For Method 15 or 16, at least 3 injects over a 1-hour period shall constitute a run.
NR 440.26(7)(e)2.
2. Where emissions are monitored by
sub. (6) (a) 3., compliance with
sub. (6) (a) 1. shall be determined using Method 6 or 6C and Method 3 or 3A of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1). A 1-hour sample shall constitute a run. Method 6 samples shall be taken at a rate of approximately 2 liters/min. The ppm correction factor (Method 6) and the sampling location in
par. (f) 1. apply. Method 4 of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1), shall be used to determine the moisture content of the gases. The sampling point for Method 4 shall be adjacent to the sampling point for Method 6 or 6C.
NR 440.26(7)(f)
(f) The owner or operator shall determine compliance with the SO
2 and the H
2S and reduced sulfur standards in
sub. (5) (a) 2. as follows:
NR 440.26(7)(f)1.
1. Method 6 of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1), shall be used to determine the SO2 concentration. The concentration in mg/dscm obtained by Method 6 or 6C is multiplied by 0.3754 to obtain the concentration in ppm. The sampling point in the duct shall be the centroid of the cross section if the cross-sectional area is less than 5.00 m
2 (53.8 ft
2) or at a point no closer to the walls than 1.00 m (39.4 in.) if the cross-sectional area is 5.00 m
2 or more and the centroid is more than 1 m from the wall. The sampling time and sample volume shall be at least 10 minutes and 0.010 dscm (0.35 dscf) for each sample. Eight samples of equal sampling times shall be taken at about 30-minute intervals. The arithmetic average of these 8 samples shall constitute a run. For Method 6C, a run shall consist of the arithmetic average of 4 1-hour samples. Method 4 of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1), shall be used to determine the moisture content of the gases. The sampling point for Method 4 shall be adjacent to the sampling point for Method 6 or 6C. The sampling time for each sample shall be equal to the time it takes for 2 Method 6 samples. The moisture content from this sample shall be used to correct the corresponding Method 6 samples for moisture. For documenting the oxidation efficiency of the control device for reduced sulfur compounds, Method 15 of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1), shall be used following the procedures of
subd. 2.
NR 440.26(7)(f)2.
2. Method 15 shall be used to determine the reduced sulfur and H
2S concentrations. Each run shall consist of 16 samples taken over a minimum of 3 hours. The sampling point shall be the same as the described for Method 6 in
subd. 1. To ensure minimum residence time for the sample inside the sample lines, the sampling rate shall be at least 3.0 lpm (0.10 cfm). The SO
2 equivalent for each run shall be calculated after being corrected for moisture and oxygen as the arithmetic average of the SO
2 equivalent for each sample during the run. Method 4 shall be used to determine the moisture content of the gases as in
subd. 1. The sampling time for each sample shall be equal to the time it takes for 4 Method 15 samples.
NR 440.26(7)(f)3.
3. The oxygen concentration used to correct the emission rate for excess air shall be obtained by the integrated sampling and analysis procedure of Method 3 or 3A of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1). The samples shall be taken simultaneously with the SO
2 reduced sulfur and H
2S, or moisture samples. The SO
2, reduced sulfur and H
2S samples shall be corrected to zero percent excess air using the equation in
par. (h) 6.
NR 440.26(7)(g)
(g) Each performance test conducted for the purpose of determining compliance under
sub. (5) (b) shall consist of all testing performed over a 7-day period using Method 6 or 6C and Method 3 or 3A of
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17 (1). To determine compliance, the arithmetic mean of the results of all the tests shall be compared with the applicable standard.
NR 440.26(7)(h)
(h) For the purpose of determining compliance with
sub. (5) (b) 1., the following calculation procedures shall be used:
NR 440.26(7)(h)1.
1. Calculate each 1-hour average concentration (dry, zero percent oxygen, ppmv) of sulfur dioxide at both the inlet and the outlet to the add-on control device as specified in
s. NR 440.13 (8). These calculations are made using the emission data collected under
sub. (6) (a).
NR 440.26(7)(h)2.
2. Calculate a 7-day average (arithmetic mean) concentration of sulfur dioxide for the inlet and for the outlet to the add-on control device using all of the 1-hour average concentration values obtained during 7 successive 24-hour periods.
where:
-
See PDF for diagram 
is the sulfur dioxide emission concentration determined in
subd. 2. at the inlet to the add-on control device, ppmv
-
See PDF for diagram is the sulfur dioxide emission concentration determined in
subd. 2. at the outlet to the add-on control device, ppmv
100 is the conversion factor, decimal to percent
NR 440.26(7)(h)4.
4. Outlet concentrations of sulfur dioxide from the add-on control device for compliance with the 50 ppmv standard, reported on a dry, O
2-free basis, shall be calculated using the procedures outlined in
subds. 1. and
2., but for the outlet monitor only.
NR 440.26(7)(h)5.
5. If supplemental sampling data are used for determining the 7-day averages under this paragraph and the data are not hourly averages, then the value obtained for each supplemental sample shall be assumed to represent the hourly average for each hour over which the sample was obtained.
NR 440.26(7)(h)6.
6. For the purpose of adjusting pollutant concentrations to zero percent oxygen, the following equation shall be used:
Cadj = Cmeas[20.9c/(20.9 - %O2)]
where:
Cadj is the pollutant concentration adjusted to zero percent oxygen, ppm or g/dscm
Cmeas is the pollutant concentration measured on a dry basis, ppm or g/dscm
20.9c is the 20.9% oxygen-0.0% oxygen (defined oxygen correction basis), percent
20.9 is the oxygen concentration in air, percent
%O2 is the oxygen concentration measured on a dry basis, percent
NR 440.26(7)(i)
(i) For the purpose of determining compliance with
sub. (5) (b) 2., the following reference methods from
40 CFR part 60, Appendix A, incorporated by reference in
s. NR 440.17, and calculation procedures shall be used except as provided in
subd. 12.:
NR 440.26(7)(i)2.
2. For gases released to the atmosphere from the fluid catalytic cracking unit catalyst regenerator:
NR 440.26(7)(i)2.a.
a. Method 8 as modified in
subd. 3. for moisture content and for the concentration of sulfur oxides calculated as sulfur dioxide.
NR 440.26(7)(i)2.c.
c. Method 2 calculation procedures, data obtained from Methods 3 and 8, for velocity and volumetric flow rate.
NR 440.26(7)(i)3.
3. Method 8 shall be modified by the insertion of a heated glass fiber filter between the probe and first impinger. The probe liner and glass fiber filter temperature shall be maintained above 160
°C (320
°F). The isopropanol impinger shall be eliminated. Sample recovery procedures described in Method 8 for container No. 1 shall be eliminated. The heated glass fiber filter also shall be excluded; however, rinsing of all connecting glassware after the heated glass fiber filter shall be retained and included in container No. 2. Sampled volume shall be at least 1 dscm.
NR 440.26(7)(i)6.
6. All testing shall be performed at the same location. Where the gases discharged by the fluid catalytic cracking unit catalyst regenerator pass through an incinerator-waste heat boiler in which auxiliary or supplemental gaseous, liquid or solid fossil fuel is burned, testing shall be conducted at a point between the regenerator outlet and the incinerator-waste heat boiler. An alternative sampling location after the waste heat boiler may be used if alternative coke burn-off rate equations, and, if requested, auxiliary/supplemental fuel SO
x credits, have been submitted to and approved by the department prior to sampling.
NR 440.26(7)(i)7.
7. Coke burn-off rate shall be determined using the procedures specified under
par. (b) 3., unless
subd. 6. applies.
NR 440.26(7)(i)8.
8. Calculate the concentration of sulfur oxides as sulfur dioxide using equation 8-3 in
Section 6.5 of Method 8 to calculate and report the total concentration of sulfur oxides as sulfur dioxide -
See PDF for diagram .
NR 440.26(7)(i)9.
9. Sulfur oxides emission rate calculated as sulfur dioxide shall be determined for each test run by the following equation:
where:
-
See PDF for diagram is the sulfur oxides emission rate calculated as sulfur dioxide, kg/hr (lb/hr)
-
See PDF for diagram is the sulfur oxides emission concentration calculated as sulfur dioxide, g/dscm (gr/dscf)
Qsd is the dry volumetric stack gas flow rate corrected to standard conditions, dscm/hr (dscf/hr)
K is a conversion factor, 1,000 g/kg (7,000 gr/lb)
where:
-
See PDF for diagram is the sulfur oxides emissions calculated as kg sulfur dioxide per Mg (lb/ton) coke burn-off
-
See PDF for diagram is the sulfur oxides emission rate calculated as sulfur dioxide, kg/hr (lb/hr)
Rc is the coke burn-off rate, Mg/hr (ton/hr)
NR 440.26(7)(i)11.
11. Calculate the 7-day average sulfur oxides emission rate as sulfur dioxide per Mg (ton) of coke burn-off by dividing the sum of the individual daily rates by the number of daily rates summed.
NR 440.26(7)(i)12.
12. An owner or operator may, upon approval by the administrator, use an alternative method for determining compliance with
sub. (5) (b) 2., as provided in
s. NR 440.08 (2). Any requests for approval shall include data to demonstrate to the administrator that the alternative method would produce results adequate for the determination of compliance.
NR 440.26(7)(j)
(j) For the purpose of determining compliance with
sub. (5) (b) 3., the following analytical methods and calculation procedures shall be used:
NR 440.26(7)(j)1.
1. One fresh feed sample shall be collected once per 8-hour period.
NR 440.26(7)(j)2.
2. Fresh feed samples shall be analyzed separately by using any one of the following applicable analytical test methods: ASTM D129-00, ASTM D1552-01, ASTM D2622-98 or ASTM D1266-98. These methods are incorporated by reference in
s. NR 440.17 (2) (a) 8., 20., 34. and 18., respectively. The applicable range of some of these ASTM methods is not adequate to measure the levels of sulfur in some fresh feed samples. Dilution of samples prior to analysis with verification of the dilution ratio is acceptable upon prior approval of the department.
NR 440.26(7)(j)3.
3. If a fresh feed sample cannot be collected at a single location, then the fresh feed sulfur content shall be determined as follows:
NR 440.26(7)(j)3.a.
a. Individual samples shall be collected once per 8-hour period for each separate fresh feed stream charged directly into the riser or reactor of the fluid catalytic cracking unit. For each sample location the fresh feed volumetric flow rate at the time of collecting the fresh feed sample shall be measured and recorded. The same method for measuring volumetric flow rate shall be used at all locations.
NR 440.26(7)(j)3.b.
b. Each fresh feed sample shall be analyzed separately using the methods specified under
subd. 2.
