Finding a product to effectively remove mercury and other hazardous components is necessary for cement plants to meet NESHAP and CISWI compliance regulations. Activated carbon injection has been recognized throughout the cement plant industry as a “best available technology” by the EPA for mercury mitigation. 4mm activated carbon pellets But what makes an activated carbon product effective for a cement plant? Here we discuss the most critical features to look for in a high quality activated carbon product.
The EPA established the National Emission Standards for Hazardous Air Pollutants (NESHAP) and Commercial and Industrial Solid Waste Incinerator (CISWI) regulations. These regulations control the amount of hazardous air pollutants (HAPs) and mercury (Hg) that can be emitted by cement plants.
The conversion of elemental mercury to an oxidized state is essential for its removal since elemental mercury does not adsorb to PAC or cement kiln dust. Historically, to achieve adequate oxidization and capture, PACs enhanced with a brominated additive have been used. However, many plants have moved away from brominated sorbents as the long-term use of brominated sorbents can lead to serious adverse plant impacts. granular-activated-carbon.com Numerous coal-fired power plants with long-term use of brominated PACs have reported corrosion of ACI systems, air heater baskets and baghouse baskets.
Using a non-halogenated, oxidizing PAC can save plants from the cost and trouble of repairing and replacing equipment damaged from corrosion. Read more about the cost of corrosion and Carbonxt’s solutions in a 2018 article from the International Cement Review magazine.