NOx Reduction

Sega’s awareness of various NOx control strategies allow us to properly identify where upgrades are necessary. The Clean Air Interstate Rule (CAIR), 8-hour O-zone, and Regional Haze regulations could require existing plants to reduce NOx emissions by installing new controls. Sega has experience with all types of fuels and boilers and can analyze the cost and benefits of installing NOx control technologies.

Sega specializes in analyzing the various control options, such as:

  • Low NOx burners
  • Over-fire air
  • Selective catalytic reduction (SCR)
  • Non-selective catalytic reduction (SNCR)
  • Hybrid SNCR/SCR
  • Rich reagent injection (RRI)
  • Combustion optimization
  • Other advanced technologies

SO2SO3 Reduction

SO2 Reduction

SO2 emissions are greatly reduced using wet, semi-dry, and dry flue gas desulfurization (FGD) technologies. Sega has explored the benefits and limitations of each type of FGD system, and can determine the proper technology to meet your specific needs.

  • Wet FGDs
  • Semi-dry FGDs and fabric filters
  • Dry FGDs

SO3 Reduction

Increased SO3 concentration in the flue gas can result in a number of negative side effects, especially after an SCR or wet FGD upgrade. If SO3 is not controlled properly, there is potential for a harmful impact on the surrounding community, as well as stack opacity. To avoid these issues, we can help you properly apply the most recent and existing, proven technologies to optimize SO3 removal.

  • Sorbent injection (wet and dry)
  • Wet electrostatic precipitators
  • Semi-dry FGD

PM and Hg Reduction

Particulate Matter (PM) Reduction

Sega has a strong knowledge of reducing particulate matter emissions and has already developed significant experience in this field. Serving as a technical consultant, Sega can provide the senior level consulting necessary for cost effective and high quality solutions. Understanding all of the challenges associated with new retrofit situations, we can also play the role of an Owner’s Engineer. Sega’s developed familiarity with electrostatic precipitator (ESP) conversion/rebuild projects, new ESPs, and fabric filters give us the ability to meet your needs.

  • Wet and dry ESP
  • Fabric filters: pulse jet and reverse gas
  • Hot-side ESP to cold-side ESP conversions
  • ESP to fabric filter conversion projects
  • ESP rebuild projects

Mercury (Hg) Reduction

Sega is constantly staying abreast of mercury control technologies. We also work to identify viable options for controlling mercury emissions and determine the technical and economic feasibility of installing new control equipment.

  • Carbon injection
  • ESPs
  • COHPAC
  • TOXECON I and II
  • Fabric filters
  • Other advanced technologies

CO2 Reduction

Despite significant decreases in overall emissions and improvements in monitored levels at gas-, oil-, and coal-fired generation facilities, greenhouse gas (GHG) or CO2 emissions have increased and are increasing the earth’s average air temperature. Sega can provide the necessary assistance to reduce emissions, including CO2, and meet all future federal, state, and local requirements.

Since CO2 control technologies are not mature in comparison to the other pollutants like NOx and SO2, CO2 capture becomes an extremely difficult challenge. Both short- and long-term solutions are monitored and the viability of each technology is closely followed. Current options like efficiency improvements, fuel optimization, and offsets are available. Sega also stays up-to-date on developing CO2 capture and sequestration technologies to provide the best possible solutions for meeting future CO2 regulations.

Offsets and credits

Efficiency improvements

  • Supply- and demand-side
  • Low carbon fuels (natural gas)
  • No carbon fuels (renewables)

CO2 capture

  • Chemical absorption with MEA
  • Membrane separation
  • Combustion using oxygen

CO2 sequestration

  • Deep aquifers
  • Coal seams
  • Salt domes or rock caverns
  • Ocean