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Planning Compliance with EPA’s Mercury and Air Toxics Standards (MATS)
There are many options and implications to consider in planning compliance.  To enable a clear approach to this process, ADA Carbon Solution has compiled a few guiding principles from the multitude of test programs, configurations and technology options available.  We understand that MATS compliance is unique to each plant and that both current and future configurations need to be taken into account to ensure reliable, consistent compliance for the long term.  Let us help you evaluate your MATS mercury control options.

Download ADA Carbon Solutions technical paper on Guiding Principles for MATS Mercury Control Strategies 

ABSTRACT
In planning for compliance with EPA’s Mercury and Air Toxics Standard (MATS), there are many options and implications to consider.  Comparison between technologies is best achieved through field testing.  The multitude of testing programs and field data available today have led to improved strategic thinking and planning.  Several key philosophies are synthesized in a few Guiding Principles that enable a clearer path to compliance planning and execution. 

The Guiding Principles

Adopt a Science-based Approach
Use science, not heresay, to understand your mercury capture and other effects.  Successful mercury control requires Contact, Conversion and Capture to occur to remove mercury from the system.  Each of these mechanisms must have a high degree of efficiency.  All three mechanisms must occur in as little as half a second up to a few seconds to achieve rapid and effective mercury control. Go back to the fundamentals to understand what is happening in your system and to interpret test data.

Activated Carbon Injection (ACI) with ADA Carbon Solutions’ Generation 2 and 3 sorbents,FastPAC Premium™ and FastPAC Premium-80™, is designed to achieve these three mechanisms in a highly efficient manner.

Move Mercury Removal “Upstream” to a Single Control Point
Capture of mercury in an engineered, controlled manner upstream of a particulate collector contains the conversion, contact and capture in a specific location and predominantly in one phase (flue gas).  This accomplishes secure capture from the flue gas directly to the solid phase, where it can be removed from the system by an ESP or baghouse.  If this does not occur and the mercury continues on to a downstream wet scrubber, the competing scrubber chemistries and multiple phase partitioning of mercury add complexity to the plant’s mercury control management.  Capture is not necessarily secured in the wet scrubber.

Active Control, Not Passive
Power plant operators are well-served by having an engineering control within their APC processes that they can “dial up” rapidly to obtain increased mercury control or “back off” on when over-controlling.  Devices that provide passive contributions to mercury control, such as an SCR to provide conversion/oxidation, may degrade over time or may operate only under higher-load conditions.  

Retain the Original Purpose of Equipment
The compliance method must be very reliable and minimize downstream impacts, retaining the primary purpose of the equipment.  Additives or changes to operations can have collateral effects that adversely impact equipment life, reliability, or emissions control. 

Minimize Balance-of-Plant Impacts
Balance-of-Plant impacts are a major consideration in MATS planning.  It is essential to examine the current plan for ash, gypsum, equipment changes, coal flexibility, and multi-pollutant control.  Two key potential impacts are addressed here:

ASH UTILIZATION
Key attributes for successful ash use in cement applications include foam stability over time, batch consistency, and minimal impact on air entraining agent (AEA) consumption.  The combination of unique characteristics of our Generation 2 PACs and the lower, more consistent injection rates required for good mercury control mean improved  ash utilization options.  

DRY SORBENT INJECTION / ACTIVATED CARBON INTERACTIONS
DSI is needed for many reasons, but can have cross-media impacts on ash utilization, particulate collection and ash sluice water.  Minimizing DSI helps to reduce these effects.  When DSI use is driven by high levels of SO3 in the flue gas, FastPAC Premium-80™ can enable reduction in the amount of lime or sodium-based sorbent required.  This optimization results in more cost-effective compliance.

Contact ADA Carbon Solutions to discuss a MATS solution tailored to your process operations.

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