Internal slagging, fouling, corrosion, and undesirable emissions are problems that have long since plagued coal-fired electric utility boilers resulting in reduced efficiency, health, safety and environmental concerns. The recent increase in SCR and FGD pollution control devices has exacerbated the problem of acid gas emissions. SCR catalysts will also convert SO2 to SO3 causing corrosion and operational issues with air heaters. Wet FGDs, although effective in capturing SO2, are ineffective in capturing gaseous SO3 which escapes from the scrubber and leads to corrosion, harmful emissions, and plume opacity.
Once introduced into the combustion zone of the boiler, CoalTreat will change the melting characteristics of the ash, thus reducing ash buildup and slagging. In addition to inhibiting the formation of slag, CoalTreat will also react with pre-existing deposits to break their tenacious bonds to internal boiler components, essentially reversing the problematic effects of reflective ash deposits that reduce heat transfer. Continuing downstream of the combustion zone, CoalTreat particles react with combustion by-products to reduce harmful levels of SO3 and H2SO4 as well as plume opacity.
Mercury poses a serious problem for humans and the environment. Coal-fired power plants are a major source of mercury emissions. Much of the mercury emitted during combustion is captured by FGD systems, only to be reemitted into the air or re-released into the water table from landfills.
Environmental Energy Services, Inc. introduces KLeeNscrub for remediating toxic heavy metal contaminates. KLeeNscrub converts soluble heavy metal compounds into insoluble, non-leachable compounds having no adverse environmental consequences.
The present form of this technology is for use with wet scrubbers to precipitate heavy metals, including mercury from scrubber liquor.
EES now offers plant owners an economical means of reducing boiler SO2 by direct furnace injection.
We use a finely round dispersion of calcium carbonate (less than one micron average particle size) for maximum reactivity. a 50% reduction in boiler SO2 is easily achieved at an economical stoichiometric ratio of 1.
ClearChem™ is a great fit with backend DSI systems offering reduced overall reagent usage due to the low stoich required with furnace injection. It is also a creative solution for plants dealing with limited scrubber capacity who are interested in additional fuel flexibility.
Adding a ClearChem™ system to reduce furnace SO2 effectively increases existing FGD capacity while adding minimal particulate load to the ESP or baghouse. This will allow the existing scrubber to handle the higher sulfur coals.
Use of ClearChem™ will also yield lower limestone makeup costs and may improve slag control with certain coals.
The ClearChem trademark is owned by ClearChem Development, LLC.
SARIS Selective Non-Catalytic Reduction (SNCR) System utilizes a novel injection system to provide better distribution and conversion for improved utilization and minimal ammonia slip. Furthermore, the novel approach provides low O&M costs due to the simple and self-cleaning nature of the design.
SARIS Injection systems are designed based on computational fluid dynamics modelling of the furnace and furnace exit gases. CFD modelling provides computational optimization of injector locations and flow rates for an efficient installation.