Eliminate Visual NOx Emissions during Plant Start-ups

Two nitrate products producers were looking for a solution to their visual NOx emission plumes during frequent plant start-ups that would satisfy both public and regulatory expectations.

USP Technologies was brought in to design a proprietary technology solution which introduces dilute H2O2 into the NOx absorber during start-ups to reduce emissions of NOx compounds such as NO and NO2. Removals of >90% are achieved, with the NOx being converted to high quality HNO3 product. The process is offered under license designed to minimize risk and disruption to operations. The license includes chemical storage and feed equipment, piping and instrumentation, process safety controls, installation and maintenance, training and documentation as well as H2O2 supply service.

USP performed a thorough Process Hazards Analysis on the process, which has resulted in several interlocks and controls being incorporated into the basic design. The process is currently used safely in over 30 start-ups per year at two HNO3 manufacturing units. All piping, components, and controls needed to operate the process safely are included with the license and are installed by experienced H2O2 specialists. The H2O2 storage and feed systems are of modular design and are code-compliant, with years of safe operating history.

For more information on how H2O2 can reduce NOx:

1. How to control NOx
2. The Chemical Aspect of NOx Scrubbing –
3. Control of Nitrogen Oxide Emissions by Hydrogen Peroxide-Enhanced Gas-Phase Oxidation Of Nitric Oxide – PubMed