HT is the vent stream net heating value MJ/scm (Btu/scf), where the net enthalpy per mole of vent stream is based on combustion at 25°C and 760 mm Hg (68°F and 30 in Hg), but the standard temperature for determining the volume corresponding to one mole is 20°C (68°F), as in the definition of Qs
Ys = Qs for all vent stream categories listed in Table 1 except for Category E vent streams where Ys = (Qs) (HT)/3.6 for metric units and Ys = (Qs)(HT)/97 for English units.
ETOC is the hourly emissions of TOC, kg/hr (lb/hr)
a,b,c,d,e and f are coefficients. The set of coefficients that apply to a vent stream shall be obtained from Table 1.
- See PDF for table PDF
- See PDF for table PDF
- See PDF for table PDF
- See PDF for table PDF
NR 440.686(5)(f)1.b.b. Where for a vent stream flow rate that is less than 14.2 scm/min (501 scf/min) at a standard temperature of 20°C (68°F):
TRE is the TRE index value
Qs = 14.2 scm/min (501 scf/min)
HT = (FLOW)(HVAL)/Qs
where the following inputs are used:
FLOW is the vent stream flow rate (scm/min) (scf/min), at a standard temperature of 20°C (68°F)
HVAL is the vent stream net heating value MJ/scm (Btu/scf), where the net enthalpy per mole of vent stream is based on combustion at 25°C and 760 mm Hg (77°F and 30 in Hg), but the standard temperature for determining the volume corresponding to one mole is 20°C (68°F) as in the definition of Qs
Ys is equal to Qs for all vent stream categories listed in Table 1 except for Category E vent streams, where Ys = QsHT/3.6 for metric units and Ys = QsHT/97 for English units.
ETOC is the hourly emissions of TOC reported in kg/hr (lb/hr)
a,b,c,d,e and f are coefficients. The set of coefficients that apply to a vent stream shall be obtained from Table 1.
NR 440.686(5)(f)2.2. The equation for calculating the TRE index value of a vent stream controlled by a flare is as follows:
where:
TRE is the TRE index value
ETOC is the hourly emissions of TOC, kg/hr (lb/hr)
Qs is the vent stream flow rate scm/min (scf/min), at a standard temperature of 20°C (68°F)
HT is the vent stream net heating value, MJ/scm (Btu/scf), where the net enthalpy per mole of vent stream is based on combustion at 25°C and 760 mm Hg (77°F and 30 in Hg), but the standard temperature for determining the volume corresponding to one mole is 20°C (68°F) as in the definition of Qs
a,b,c,d and e are coefficients. The set of coefficients that apply to a vent stream shall be obtained from Table 2.
- See PDF for table PDF
NR 440.686(5)(g)(g) Each owner or operator of an affected facility seeking to comply with sub. (1) (c) 4. or (3) (c) shall recalculate the TRE index value for that affected facility whenever process changes are made. Examples of process changes include changes in production capacity, feedstock type or catalyst type or whenever there is replacement, removal or addition of recovery equipment. The TRE index value shall be recalculated based on test data or on best engineering estimates of the effects of the change to the recovery system.
NR 440.686(5)(g)1.1. Where the recalculated TRE index value is less than or equal to 1.0, the owner or operator shall notify the department within one week of the recalculation and shall conduct a performance test according to the methods and procedures required by this subsection in order to determine compliance with sub. (3) (a). Performance tests shall be conducted as soon as possible after the process change but no later than 180 days from the time of the process change.
NR 440.686(5)(g)2.2. Where the initial TRE index value is greater than 8.0 and the recalculated TRE index value is less than or equal to 8.0 but greater than 1.0, the owner or operator shall conduct a performance test in accordance with s. NR 440.08 and this subsection and shall comply with subs. (4) and (6) and this subsection. Performance tests shall be conducted as soon as possible after the process change but no later than 180 days from the time of the process change.