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COMBUSTION TURBINE OPERATIONS TECHNICAL FORUM (CTOTF™) SUPPLEMENT

ADVERTISING

EVALUATING MATS OPTIONS WITH FIELD DEMONSTRATIONS

ABSTRACTIn planning for compliance with EPA’s Mercury and Air Toxics Stan-dard (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. As one of the Principles, getting a handle on balance-of-plant and multi-pollutant interactions is critical to success. One area is ash utiliza-tion, which recent improvements in activated carbons and lower injection rates have improved. Past testing has also shown that mercury control performance degrades with SO3 present, through injection or native high sulfur coal. Tests using newly developed powdered activated carbons (Generation 2 and 3 PACs) have shown that performance is significantly improved over conventional PACs and that dry sorbent injection (DSI) for acid gas control impacts this. In certain applications, a marked effect is seen with interac-tions between DSI and ACI, which are both necessary for successful MATS compliance. These correlations are presented, and the impli-cations for compliance planning discussed.

INTRODUCTIONEPA’s Mercury and Air Toxics Standards (MATS) compliance dates are coming up, and coal-fired power plants affected by the rule are actively pursuing emissions solutions that fulfill realistic compli-ance strategies. With deadlines for compliance in 2015 and 2016 ( for units that obtain a one-year delay), time is getting short for major procurement decisions, resulting in less time for testing and selection of options/alternatives. As the thought process is driven forward by strategic planning, the priority of full plant integration, including all existing processes, and fully considering impacts and interferences, has become the driver behind compliance planning decisions. Once the rule takes effect, mercury limits will have to be met on a 30-day rolling average at 1.2 lb/TBTU for most coals (4 lb/TBTU for low-rank lignite coal). Considerations in addition to mer-cury capture, such as multi-pollutant effects, co-benefits of control devices, economics of alternatives, impacts to other equipment and process modifications need to be quantified and measured. The goal is to anticipate and minimize adverse impacts, preserving the vital and primary purpose of the power generator and its ma-jor equipment, while not compromising the ability to comply and produce at desired levels. A holistic view of the power plant sys-tem is needed to effectively manage the many compliance activities that power plants face. Improved test data and availability, deeper understanding of the underlying science, and practical experience have driven better integration options. Synthesizing many of these learnings and gaining a better understanding of mercury control options are challenges that EGUs are facing. It helps to have a para-digm, or Guiding Principles to address these issues constructively.

1  

3. Active Control Rather Than Passive

Use Advanced “Generation 2+” PACs, such as FastPAC Premium™, to accomplish rapid Hg capture to low residual levels, thus allowing active,

responsive “dial-up” and “turn-down” control on demand.

Steep, Rapid Capture

Low Hg Residual & Secure Capture

GEN 2 FastPACTM Premium

0.0  

1.0  

2.0  

3.0  

4.0  

5.0  

6.0  

0.0   0.5   1.0   1.5   2.0   2.5   3.0   3.5   4.0   4.5   5.0  

Hg  Emission

s    (Lb/TBtu)  

Lb  Ac5vated  Carbon/MMacf  

US  Emission  Standard  1.2  Lb/TBtu  

GEN  2    FastPAC  Premium™  

•  >  200  MW  EGU  •  PRB  Fired    •  Emission  Train  ConfiguraBon:  

 Economizer-­‐ACI-­‐APH-­‐ESP-­‐Stack  

 •  Hg  CEMS  

ADA Carbon Solutions, LLC1460 W. Canal CourtLittleton, CO 80120-5632Phone: 303-962-1977Fax: 303-962-1970

ADA-CS

EVALUATING MATS OPTIONS WITH FIELD DEMONSTRATIONSABSTRACTIn 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 think-ing and planning. Several key philosophies are synthesized in a few Guiding Principles that enable a clearer path to compli-ance planning and execution. As one of the Principles, getting a handle on balance-of-plant and multipollutant interactions is critical to success. One area is ash utilization, which recent improvements in activated carbons and lower injection rates have improved. Past testing has also shown that mercury con-trol performance degrades with SO3 present, through injec-tion or native high sulfur coal. Tests using newly developed powdered activated carbons (Generation 2 and 3 PACs) have shown that performance is significantly improved over con-ventional PACs and that dry sorbent injection (DSI) for acid gas control impacts this. In certain applications, a marked ef-fect is seen with interactions between DSI and ACI, which are both necessary for successful MATS compliance. These cor-relations are presented, and the implications for compliance planning discussed.

1  

3. Active Control Rather Than Passive

Use Advanced “Generation 2+” PACs, such as FastPAC Premium™, to accomplish rapid Hg capture to low residual levels, thus allowing active,

responsive “dial-up” and “turn-down” control on demand.

Steep, Rapid Capture

Low Hg Residual & Secure Capture

GEN 2 FastPACTM Premium

0.0  

1.0  

2.0  

3.0  

4.0  

5.0  

6.0  

0.0   0.5   1.0   1.5   2.0   2.5   3.0   3.5   4.0   4.5   5.0  

Hg  Emission

s    (Lb/TBtu)  

Lb  Ac5vated  Carbon/MMacf  

US  Emission  Standard  1.2  Lb/TBtu  

GEN  2    FastPAC  Premium™  

•  >  200  MW  EGU  •  PRB  Fired    •  Emission  Train  ConfiguraBon:  

 Economizer-­‐ACI-­‐APH-­‐ESP-­‐Stack  

 •  Hg  CEMS  

ADVERTISING

ADA Carbon Solutions, LLC1460 W. Canal CourtLittleton, CO 80120-5632Phone: 303-962-1977Fax: 303-962-1970

ADA-CS

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