N.M. Code R. § 20.11.46.21 Protocol Web 1: So[2] Monitoring of Fuel Gas Combustion Devices

• Library: New Mexico Administrative Code
• Edition: 2023
• Currency: Current through Register Vol. 34, No. 24, December 19, 2023
• Citation: N.M. Code R. § 20.11.46.21
• Year: 2023

A. Applicability.

(1) The provisions of this protocol are applicable to fuel gas combustion devices at petroleum refineries.

(2) Fuel gas combustion devices include boilers, process heaters, and flares used to burn fuel gas generated at a petroleum refinery.

(3) Fuel gas means any gas, which is generated, and combusted at a petroleum refinery. Fuel gas does not include:(a) natural gas, unless combined with other gases generated at a petroleum refinery; (b) gases generated by a catalytic cracking unit catalyst regenerator; (c) gases generated by fluid coking burners; (d) gases combusted to produce sulfur or sulfuric acid; or (e) process upset gases generated due to startup, shutdown, or malfunctions.

B. Monitoring requirements.

(1) Except as provided in Paragraph (2) and Paragraph (3) of Subsection B of 20.11.46.21 NMAC, fuel gas combustion devices shall use a continuous fuel gas monitoring system (CFGMS) to determine the total sulfur content (reported as H2S) of the fuel gas mixture prior to combustion, and continuous fuel flow meters to determine the amount of fuel gas burned.(a) Fuel gas combustion devices having a common source of fuel gas may be monitored for sulfur content at one location, if monitoring at that location is representative of the sulfur content of the fuel gas being burned in any fuel gas combustion device. (b) The CFGMS shall meet the performance requirements in Performance Specification 2 in Appendix B to 40 CFR Part 60, and the following (i) continuously monitor and record the concentration by volume of total sulfur compounds in the gaseous fuel reported as ppmv H2S; (ii) have the span value set so that the majority of readings fall between 10 and 95% of the range; (iii) record negative values of zero drift for initial certification and daily calibration error tests; (iv) calibration drift shall be 5.0% of the span; and (v) use EPA Test Method 15A or 16, or an approved alternative test method to determine total reduced sulfur emissions; these are the reference methods for the relative accuracy test; and the relative accuracy test shall include a bias test in accordance with Paragraph (3) of Subsection D of 20.11.46.21 NMAC. (c) All continuous fuel flow meters shall comply with the provisions of Section 2.1.5 of Appendix D to 40 CFR Part 75. (d) The hourly mass SO2 emissions rate for all the fuel combustion devices monitored by this approach shall be calculated using the following equation Et = (CS)(Qf)(K); where: Et = Total SO2 emissions in lb/hr from applicable fuel gas combustion devices; CS = Sulfur content of the fuel gas as H2S (ppmv); Qf = Fuel gas flow rate to the applicable fuel gas combustion devices (scf/hr); and K = 1.660 x 10-7 (lb/scf)/ppmv.

(2) As an alternative to using a CFGMS as required by Paragraph (1) of Subsection B of 20.11.46.21 NMAC, fuel gas combustion devices having a common source of fuel gas may be monitored with an SO2 CEMS and flow CEMS and (if necessary) a moisture monitoring system at only one location, if the CEMS monitoring at that location is representative of the SO2 emission rate (lb SO2/scf fuel gas burned) of all applicable fuel gas combustion devices. Continuous fuel flow meters shall be used in accordance with Paragraph (2) of Subsection B of 20.11.46.21 NMAC, and the fuel gas combustion device monitored by a CEMS shall have separate fuel metering (a) Each CEMS for SO2 and flow, and (if applicable) moisture, shall comply with the operating requirements, performance specifications, and quality-assurance requirements of 40 CFR Part 75. (b) All continuous fuel flow meters shall comply with the provisions of Section 2.1.5 of Appendix D to 40 CFR Part 75. (c) The SO2 hourly mass emissions rate for all the fuel gas combustion devices monitored by this approach shall be determined by the ratio of the amount of fuel gas burned by the CEMS-monitored fuel gas combustion device to the total fuel gas burned by all applicable fuel gas combustion devices using the following equation Et = (Em)(Qt)/(Qm) where: Et = Total SO2 emissions in lb/hr from applicable fuel gas combustion devices; ...