Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 218 - ORGANIC MATERIAL EMISSION STANDARDS AND LIMITATIONS FOR THE CHICAGO AREA › Subpart Q - LEAKS FROM SYNTHETIC ORGANIC CHEMICAL AND POLYMER MANUFACTURING PLANT › Section 218.429 - Standards for Control Devices

Current through Register Vol. 48, No. 28, July 12, 2024
Control devices used to comply with Section 218.428(c) of
				  this Part shall comply with the following:
a) If the control device is a vapor recovery
				system (for example, condensers and adsorbers), it shall be designed and
				operated to recover the VOM emissions vented to it with an efficiency of 95
				percent or greater.
b) If the
				control device is an enclosed combustion device, it shall be designed and
				operated to reduce the VOM emissions vented to it with an efficiency of 95
				percent or greater, or to provide a minimum residence time of 0.75 seconds at a
				minimum temperature of 816° C.
c) If the control device is a flare, it
				shall:
1) Be designed for and operated with no
				visible emissions as determined by USEPA Reference Method 22, 40 CFR 60,
				Appendix A (1986), incorporated by reference in Section 218.112, except for
				periods not to exceed a total of 5 minutes during any 2 consecutive
				hours.
2) Be operated with a pilot
				flame present at all times and shall be monitored with a thermocouple or any
				other equivalent device to detect the presence of the pilot flame.
3) Be steam-assisted, air assisted, or
				nonassisted.
4) Be used only with
				the net heating value of the gas being combusted being 11.2 MJ/scm (300
				Btu/scf) or greater if the flare is steam-assisted or air-assisted; or with the
				net heating value of the gas being combusted being 7.45 MJ/scm or greater if
				the flare is nonassisted. The net heating value of the gas being combusted
				shall be calculated using the following equation:
Image
Where:
Hr
=
Net heating value of the sample in MJ/scm; where the
							 net enthalpy per mole of offgas is based on combustion at 25° C and 760
							 mmHg, but the standard temperature for determining the volume corresponding to
							 one mole is 20° C;
K
=
Constant, 1.740 x 10-7
							 (l/ppm) (g-mole/scm) (MJ/Kcal)
where
standard temperature for (g-mole/scm) is 20° C;
Ci
=
Concentration of sample component i in ppm as
							 measured by USEPA reference method 18, 40 CFR 60, Appendix A (1986), and ASTM D
							 2504-83, both incorporated by reference in Section 218.112;
Hi
=
Net heat of combustion of sample component I, kcal/g
							 mole. The heats of combustion may be determined using ASTM D 2382-83,
							 incorporated by reference in Section 218.112 of this Part, if published values
							 are not available or cannot be calculated.
5)
				Steam-assisted and nonassisted flares shall be designed and operated with an
				exit velocity, as determined by dividing the volumetric flowrate (in units of
				standard temperature and pressure), as determined by USEPA Reference Method 2
				or 2A, 40 CFR 60, Appendix A (1986) incorporated by reference in Section
				218.112 of this Part, as appropriate, by the unobstructed (free) cross
				sectional area of the flare tip, less than 18 m/sec (60 ft/sec).
6) Air-assisted flares shall be designed and
				operated with an exist velocity less than the maximum permitted velocity,
				V[m]ax as determined by the following equation:
Vmax = 8.706 + 0.7084
				  (Hr);
Vmax
=
Maximum permitted velocity, m/se;
8.706
=
Constant;
0.7084
=
Constant;
Hr
=
The net heating value as determined in subsection
							 (c)(4) of this section.