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Low-Cost Techniques for NOx Reduction

By Joseph Colannino |

An understanding of the available NOx-reduction strategies will help engineers to select the best technique to improve the performance of their combustion processes Pollution due to oxides of nitrogen — frequently abbreviated as NOx — is regulated with varying degrees of severity in different localities. NOx regulations are regional for good reason: NOx and hydrocarbons react in a complex way to produce smog, and smog formation is greatly affected by topological and meteorological conditions. NOx reduction to very low levels carries economic impact, and balancing environmental and economic requirements has been a mainstay of air quality legislation since its inception. There are many inexpensive and historically validated NOx-reduction techniques that can cut NOx in half, as dicsussed in this article. NOx regulations are complex and vary by industry, fuel type, equipment and region. Some parts of the U.S. require NOx emissions at or below 9 parts per million (ppm) for some stationary sources, such as boilers and steam generators, while other equipment and regions are less regulated. Remediation requirements vary nationally from routine maintenance and tune-ups to selective catalytic reduction (SCR) strategies, and these differ…
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