Nalco Mobotec Expertise in Reducing Sulfur Dioxide and Sulfur Trioxide Emissions

SO₂ reductions with ROFA FSI
and sorbent

Sulfur dioxide (SO₂) is produced during combustion of coal and other fossil fuels; it is one of the primary pollutants, along with nitrogen oxides (NO_x) and particulates, which must be controlled.

Without pollution controls, SO₂ is released into the atmosphere following the combustion process. The SO₂ emissions are carried large distances downwind and contribute to formation of acid rain and fine particulates (PM 2.5), both of which are damaging to the environment and to human health. SO₂ emissions also contribute to regional haze, resulting in reduced visibility at our national parks and wildlife refuges. Sulfur trioxide (SO₃) is also produced during combustion and during use of selective catalytic reduction (SCR). These SO₃ emissions produce a visible plume that can exceed opacity limits and also interferes with capture of mercury by activated carbon.

Federal, state, and local air quality regulations mandate stringent limits on emission of SO₂ and other pollutants to protect public health and ensure conformity with national visibility standards. Nalco Mobotec’s patented technology significantly improves NO_x and SO₂ reductions and particulate emissions—improving air quality and reducing acid rain.

To Reduce SO₂ Emissions, Nalco Mobotec Created the Furnace Sorbent Injection System

Feed System for SO_x Injection

Nalco Mobotec can provide a simple, practical, and very low-capital-cost solution for reducing SO₂ and SO₃ emissions on coal-fired boilers—particularly compared to other desulfurization technologies such as wet or dry scrubbers. Our patented sorbent injection system enables us to introduce a variety of specialized sorbents as well as lime and limestone into the furnace. When combined with our Rotating Opposed Fired Air (ROFA^®) System design, sorbent utilization is maximized, allowing injection of minimal sorbent quantity. Excellent mixing provides SO₂ emission reductions of up to 80 percent and SO₃ reductions greater than 90 percent, along with substantial reductions of NO_x, particulate and mercury emissions.

ROFA technology greatly increases mixing and turbulence, providing an even greater degree of contact between the lime, limestone or specialty sorbents and the flue gas. This enhances SO₂ capture and reduces the amount of sorbent needed to achieve the required emission limit. Reduction of SO₂ and other emissions from the installation of our ROFA/FSI technology is easily visualized with the help of our Computational Fluids Dynamics model.

Nalco Mobotec’s experts work with your technical and management personnel to provide the most cost-effective solution for meeting air quality requirements. For further information on our technologies for SO₂ and SO₃ reductions, please refer to the Contact Us page.