NR 440.684(2)(b)6.6. “Z” is the minimum required sulfur dioxide (SO2) emission reduction efficiency, expressed as percent carried to one decimal place. Zi refers to the reduction efficiency required at the initial performance test. Zc refers to the reduction efficiency required on a continual basis after compliance with Zi has been demonstrated.
NR 440.684(3)(3)Standards for sulfur dioxide.
NR 440.684(3)(a)(a) During the initial performance test required by s. NR 440.08 (2), each owner or operator shall achieve, at a minimum, an SO2 emission reduction efficiency (Zi) to be determined from Table 1 based on the sulfur feed rate (X) and the sulfur content of the acid gas (Y) of the affected facility.
NR 440.684(3)(b)(b) After demonstrating compliance with the provisions of par. (a), the owner or operator shall achieve, at a minimum, an SO2 emission reduction efficiency (Zc) to be determined from Table 2 based on the sulfur feed rate (X) and the sulfur content of the acid gas (Y) of the affected facility.
NR 440.684(4)(4)Compliance provisions.
NR 440.684(4)(a)(a)
NR 440.684(4)(a)1.1. To determine compliance with the standards for sulfur dioxide specified in sub. (3) (a), during the initial performance test as required by s. NR 440.08, the minimum required sulfur dioxide emissions reduction efficiency (Z) is compared to the emission reduction efficiency (R) achieved by the sulfur recovery technology.
NR 440.684(4)(a)1.a.a. If R is greater than or equal to Zi, the affected facility is in compliance.
NR 440.684(4)(a)1.b.b. If R is less than Zi, the affected facility is not in compliance.
NR 440.684(4)(a)2.2. Following the initial determination of compliance as required by s. NR 440.08, any subsequent compliance determinations that may be required by the department shall compare R to Zc.
NR 440.684(4)(b)(b) The emission reduction efficiency (R) achieved by the sulfur recovery technology shall be determined using the procedures in sub. (5) (c) 1.
NR 440.684(5)(5)Test methods and procedures.
NR 440.684(5)(a)(a) In conducting the performance tests required in s. NR 440.08, the owner or operator shall use as reference methods and procedures the test methods in Appendix A of 40 CFR part 60, incorporated by reference in s. NR 440.17, or other methods and procedures as specified in this subsection, except as provided in s. NR 440.08 (2).
NR 440.684(5)(b)(b) During a performance test required by s. NR 440.08, the owner or operator shall determine the minimum required reduction efficiencies (Z) of SO2 emissions as required in sub. (3) (a) and (b) as follows:
NR 440.684(5)(b)1.1. The average sulfur feed rate (X) shall be computed as follows:
where:
X is the average sulfur feed rate, Mg/d (long ton/day)
Qa is the average volumetric flow rate of acid gas from sweetening unit, dscm/day (dscf/day)
Y is the average H2S concentration in acid gas feed from sweetening unit, percent by volume, expressed as a decimal
K is (32kg S/kg-mole)/((24.04 dscm/kg-mole)(1000kg S/Mg)) = 1.331 x 10-3 Mg/dscm for metric units, and is (32 lb S/lb-mole)/((385.36 dscf/lb-mole)(2240 lb S/long ton)) = 3.707 x 10-5 long ton/dscf for English units
NR 440.684(5)(b)2.2. The continuous readings from the process flowmeter shall be used to determine the average volumetric flow rate (Qa) in dscm/day (dscf/day) of the acid gas from the sweetening unit for each run.
NR 440.684(5)(b)3.3. The Tutwiler procedure in sub. (9) or a chromatographic procedure following ASTM E260-96, incorporated by reference in s. NR 440.17 (2) (a) 75., shall be used to determine the H2S concentration in the acid gas feed from the sweetening unit. At least one sample per hour, at equally spaced intervals, shall be taken during each 4-hour run. The arithmetic mean of all samples shall be the average H2S concentration (Y) on a dry basis for the run. By multiplying the result from the Tutwiler procedure by 1.62 ×10-3, the units gr/100 scf are converted to volume percent.
NR 440.684(5)(b)4.4. Using the information from par. (b) 1. and 3., Tables 1 and 2 shall be used to determine the required initial (Zi) and continuous (Zc) reduction efficiencies of SO2 emissions.
NR 440.684(5)(c)(c) The owner or operator shall determine compliance with the SO2 standards in sub. (3) (a) or (b) as follows:
NR 440.684(5)(c)1.1. The emission reduction efficiency (R) achieved by the sulfur recovery technology shall be computed for each run using the following equation:
NR 440.684(5)(c)2.2. The level indicators or manual soundings shall be used to measure the liquid sulfur accumulation rate in the product storage tanks. Readings taken at the beginning and end of each run, the tank geometry, sulfur density at the storage temperature and sample duration shall be used to determine the sulfur production rate (S) in kg/hr (lb/hr) for each run.
NR 440.684(5)(c)3.3. The emission rate of sulfur shall be computed for each run as follows:
=
where: