NR 440.686(5)(e)6. 6. The total process vent stream concentration (by volume) of compounds containing halogens (ppmv, by compound) shall be summed from the individual concentrations of compounds containing halogens which were measured by Method 18.

NR 440.686(5)(f) (f) For purpose of complying with sub. (3) (c), the owner or operator of a facility affected by this section shall calculate the TRE index value of the vent stream using the equation for incineration in subd. 1. for halogenated vent streams. The owner or operator of an affected facility with a nonhalogenated vent stream shall determine the TRE index value by calculating values using both the incinerator equation in subd. 1. and the flare equation in subd. 2. and selecting the lower of the 2 values.

NR 440.686(5)(f)1. 1. The equation for calculating the TRE index value of a vent stream controlled by an incinerator is as follows:

NR 440.686(5)(f)1.a. a. Where for a vent stream flow rate that is greater than or equal to 14.2 scm/min (501 scf/min) at a standard temperature of 20°C (68°F):

TRE is the TRE index value

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 (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

- See PDF for table

- See PDF for table

- See PDF for table

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)