FLOW is the vent stream flow rate (scm/min) at a standard temperature of 20°C
HVAL is the vent stream net heating value (MJ/scm) where the net enthalpy per mole of vent stream is based on combustion at 25°C and 760 mm Hg but the standard temperature for determining the volume corresponding to one mole is 20°C as in the definition of Qs
Ys is 14.2 scm/min for all vent streams except for Category E vent streams where Ys = (14.2) (HT)/3.6
ETOC is the hourly emissions of TOC reported in kg/hr
a, b, c, d, e and f are coefficients. The set of coefficients that apply to a vent stream can be obtained from Table 1.
NR 440.705(5)(e)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 emission rate of TOC reported in kg/hr
Qs is the vent stream flow rate (scm/min) at a standard temperature of 20°C
HT is the vent stream net heating value (MJ/scm) where the net enthalpy per mole of offgas is based on combustion at 25°C and 760 mm Hg but the standard temperature for determining the volume corresponding to one mole is 20°C as in the definition of Qs
a, b, c, d and e are coefficients. The set of coefficients that apply to a vent stream can be obtained from Table 2.
- See PDF for table PDF
NR 440.705(5)(f)(f) Each owner or operator of an affected facility seeking to comply with sub. (1) (c) 2. 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 on the recovery system.
NR 440.705(5)(f)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) or (b). 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 440.705(5)(f)2.2. Where 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.
NR 440.705(5)(g)(g) Any owner or operator subject to the provisions of this section seeking to demonstrate compliance with sub. (1) (c) 4. shall use Method 2, 2A, 2C or 2D of Appendix A to 40 CFR part 60, incorporated by reference in s. NR 440.17, for determination of volumetric flow rate.
NR 440.705(5)(h)(h) Each owner or operator seeking to demonstrate that a reactor process vent stream has a TOC concentration for compliance with the low concentration exemption in sub. (1) (c) 8. shall conduct an initial test to measure TOC concentration.
NR 440.705(5)(h)1.1. The sampling site shall be selected as specified in par. (d) 1. a.
NR 440.705(5)(h)2.2. Method 18 or Method 25A of Appendix A of 40 CFR part 60, incorporated by reference in s. NR 440.17, shall be used to measure concentration.
NR 440.705(5)(h)3.3. Where Method 18 is used to qualify for the low concentration exclusion in sub. (1) (c) 8., the procedures in par. (b) 4. a. and d. shall be used to measure TOC concentration and the procedures of par. (b) 3. shall be used to correct the TOC concentration to 3% oxygen. To qualify for the exclusion, the results shall demonstrate that the concentration of TOC corrected to 3% oxygen is below 300 ppm by volume.
NR 440.705(5)(h)4.4. Where Method 25A is used, the following procedures shall be used to calculate ppm by volume TOC concentration corrected to 3% oxygen:
NR 440.705(5)(h)4.a.a. Method 25A shall be used only if a single organic compound is greater than 50% of total TOC, by volume, in the reactor process vent stream. This compound shall be the principal organic compound.
NR 440.705(5)(h)4.b.b. The principal organic compound may be determined by either process knowledge or test data collected using an appropriate reference method. Examples of information that could constitute process knowledge include calculations based on material balances, process stoichiometry or previous test results provided the results are still relevant to the current reactor process vent stream conditions.
NR 440.705(5)(h)4.c.c. The principal organic compound shall be used as the calibration gas for Method 25A.
NR 440.705(5)(h)4.d.d. The span value for Method 25A shall be 300 ppmv.
NR 440.705(5)(h)4.e.e. Use of Method 25A is acceptable if the response from the high level calibration gas is at least 20 times the standard deviation of the response from the zero calibration gas when the instrument is zeroed on the most sensitive scale.
NR 440.705(5)(h)4.f.f. The owner or operator shall demonstrate that the concentration of TOC, including methane and ethane, measured by Method 25A, corrected to 3% oxygen, is below 150 ppm by volume to qualify for the low concentration exclusion in sub. (1) (c) 8.
NR 440.705(5)(h)4.g.g. The concentration of TOC shall be corrected to 3% oxygen using the procedures and equation in par. (b) 3.