§ 60.6005 How do I monitor the injection rate of activated carbon?
If your municipal waste combustor uses activated carbon to control dioxins/furans or mercury emissions, you must meet three requirements:
(a) Select a carbon injection system operating parameter(s) that can be used to calculate carbon feed rate (for example, screw feeder speed, hopper volume, or hopper refill frequency).
(b) During the initial and each subsequent dioxins/furans and mercury performance stack test specified in § 60.5970, estimate an average carbon feed rate in kilograms (or pounds) per hour. You must determine an average operating parameter level that correlates to the carbon feed rate and establish a relationship between the operating parameter(s) and the carbon feed rate in order to estimate the average carbon feed rate. If a subsequent dioxins/furans performance test is being performed on only one municipal waste combustor as specified in § 60.5980, you may apply the same estimated average carbon mass feed rate from the tested facility for all the similarly designed and operated municipal waste combustors.
(c) Continuously monitor the selected carbon injection operating parameter(s) (as specified in paragraph (b) of this section) during all periods when the municipal waste combustor is operating and combusting waste, and calculate the 8-hour block average carbon feed rate in kilograms (or pounds) per hour, based on the selected operating parameter. The 8-hour block average must equal or exceed the level(s) documented during the performance tests specified under paragraph (b) of this section, except that during the annual dioxins/furans or mercury performance test and the 2 weeks preceding the annual dioxins/furans or mercury performance test, the limit for average mass carbon feed rate may be waived following permission of the Administrator if the tests are for the purpose of evaluating system performance, testing new technology or control technologies, diagnostic testing, or related activities for the purpose of improving facility performance or advancing the state-of-the-art for controlling facility emissions.
(d) You must estimate the total carbon usage of the facility (kilograms or pounds) for each calendar quarter using two independent methods:
(1) The weight of carbon delivered to the facility.
(2) Estimate the average carbon mass feed rate in kilograms per hour or pounds per hour for each hour of operation for each municipal waste combustor, based on the selected carbon injection operating parameter(s) specified in paragraph (b) of this section, and as specified in equation 2 to § 60.6140.
(e) Use pneumatic injection pressure or another carbon injection system operational indicator for additional verification of proper carbon injection system operation. The operational indicator must provide an instantaneous visual and/or audible alarm to alert the operator of a potential interruption in the carbon feed that would not normally be indicated by direct monitoring of carbon mass feed rate (e.g., continuous weight loss feeder) or monitoring of the carbon system operating parameter(s) that are the indicator(s) of carbon mass feed rate (e.g., screw feeder speed). The carbon injection system operational indicator used to provide additional verification of carbon injection system operation, including basis for selecting the indicator and operator response to the indicator alarm, shall be included in the site-specific operating manual required under § 60.5855 of this subpart.