Current through Register Vol. 35, No. 18, September 24, 2024
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; and this protocol does
not modify the SO2 monitoring requirements in
20.11.46.16 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) sensor
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; and 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
20.11.46 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; and the
reference value need not be certified;
(d) the relative accuracy of the PFMS must be
less than or equal to 10.0 percent of the reference method average value, and
include a bias test in accordance with Paragraph (3) of Subsection D of
20.11.46.22 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; and 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 initial relative accuracy test
over the normal range of operating conditions of the kiln. Using the results of
the relative accuracy test audit, conduct a bias test in accordance with
Appendix A to 40 CFR Part 75; and calculate and apply a bias adjustment factor
if required.
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; and
calculate the relative accuracy (and bias adjustment factor) as described in
20.11.46.21 NMAC and 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 20.11.46.22 NMAC, 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 20.11.46.16 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; and the department may require that the subsequent monitoring plan
include additional explanation and documentation for the reasonableness of the
proposed PFMS.
