N.M. Code R. § 20.2.81.112

Current through Register Vol. 35, No. 11, June 11, 2024

Section 20.2.81.112 - NMAC PREDICTIVE FLOW MONITORING SYSTEMS FOR KILNS WITH POSITIVE PRESSURE FABRIC FILTER

A. Applicability. The provisions of this protocol are applicable to cement kilns or lime kilns that:

(1) are controlled by a positive pressure fabric filter;

(2) combust only a single fuel, no fuel blends; and

(3) have operating conditions upstream of the fabric filter that the WEB source documents would reasonably prevent reliable flow monitor measurements; this protocol does not modify the sulfur dioxidemonitoring requirements in 20.2.81.106 NMAC.

B. Monitoring requirements.

(1) A cement or lime kiln with a positive pressure fabric filter shall use a predictive flow monitoring system (PFMS) to determine the hourly kiln exhaust gas flow.

(2) A PFMS is the total equipment necessary for the determination of exhaust gas flow using process or control device operating parameter measurements and a conversion equation, a graph, or computer program to produce results in cubic feet per hour.

(3) The PFMS shall meet the following performance specifications.

(a) Sensors readings and conversion of sensor data to flow in cubic feet per hour must be automated.

(b) The PFMS must allow for the automatic or manual determination of failed monitors. At a minimum a daily determination must be performed.

(c) The PFMS shall have provisions to check the calibration error of each parameter that is individually measured. The owner or operator shall propose appropriate performance specifications in the initial monitoring plan for all parameters used in the PFMS comparable to the degree of accuracy required for other monitoring systems used to comply with 20.2.81 NMAC. The parameters shall be tested at two levels, low: 0 to 20 percent of full scale, and high: 50 to 100 percent of full scale. The reference value need not be certified.

(d) The relative accuracy of the PFMS must be 10.0 percent of the reference method average value, and include a bias test in accordance with Paragraph 3 of Subsection D of 20.2.81.112 NMAC.

C. Certification Requirements. The PFMS is subject to initial certification testing. The source owner or operator shall:

(1) demonstrate the ability of the PFMS to identify automatically or manually a failed monitor;

(2) provide evidence of calibration testing of all monitoring equipment. Any tests conducted within the previous 12 months of operation that are consistent with the QA/QC plan for the PFMS are acceptable for initial certification purposes; and

(3) perform an relative accuracy test audit and accompanying bias test once every four operating quarters. Calculate the relative accuracy (and bias adjustment factor) as described in Appendix A to 40 CFR Part 75. An out of control period occurs whenever the flow relative accuracy is greater than 10.0 percent of the mean value of the reference method.

D. Quality assurance and quality control requirements. A quality assurance and quality control plan shall be developed and implemented for each PFMS in compliance with Sections 1 and 1.1 of Appendix B of 40 CFR Part 75, and the following:

(1) perform a daily monitor failure check;

(2) perform calibration tests of all monitors for each parameter included in the PFMS. At a minimum, calibrations shall be conducted prior to each relative accuracy test audit; and

(3) perform a relative accuracy test audit and accompanying bias test once every four operating quarters. Calculate the relative accuracy (and bias adjustment factor) as described in Appendix A to 40 CFR Part 75. An out of control period occurs whenever the flow relative accuracy is greater than 10.0 percent of the mean value of the reference method.

E. Missing data. For any period in which valid data are not being recorded by the PFMS specified in this section, hourly missing or invalid data shall be replaced with substitute data in accordance with the flow monitor missing data requirements for non-load based units in subpart D of 40 CFR Part 75.

F. Monitoring plan requirements. In addition to the general monitoring plan requirements of 20.2.81.106 NMAC, the owner or operator shall meet the following additional requirements.

(1) The monitoring plan shall document the reasons why stack flow measurements upstream of the fabric filter are unlikely to provide reliable flow measurements over time.

(2) The initial monitoring plan shall explain the relationship of the proposed parameters and stack flow, and discuss other parameters considered and the reasons for not using those parameters in the PFMS. The department may require that the subsequent monitoring plan include additional explanation and documentation for the reasonableness of the proposed PFMS.

N.M. Code R. § 20.2.81.112

20.2.81.112 NMAC - N, 12/31/03