Coal, Emissions

EPRI develops economical NOx reduction process

Palo Alto, Calif. – April 2, 2002 — A new NOx reduction process developed by the Electric Power Research Institute (EPRI) provides coal-fired generating units with a cost-effective means of complying with NOx regulations.

The process, called Rich Reagent Injection (RRI), reduces NOx formation by injecting amine-based compounds into the fuel-rich region of the cyclone furnace. The combustion process is then completed with another EPRI innovation, cyclone overfire air. Overfire air has been fitted to over 70% of the cyclone furnace market, and is responsible for reducing over 1 million tons of NOx from the atmosphere, says Dave O’Connor, EPRI’s manager for combustion performance.

“Initial full scale demonstrations of RRI in a cyclone-type furnace have been extremely effective,” noted O’Connor. “We have found that the RRI system, which can be used alone or in combination with other NOx reduction technologies, is less expensive and easier to install than an SCR system.”

The first demonstration of RRI was completed at Conectiv’s B. L. England Unit 1, in Beesley’s Point, New Jersey. “In our tests, we were able to lower our NOx an additional 28%, and the low capital cost of this process makes it even more valuable,” said station manager, William Gibson.

Conectiv’s senior engineer, V.N. Bhamidipati, explained that the RRI system produces no ammonia slip and virtually eliminates flyash disposal difficulties and air heater pluggage problems. He said that Conectiv used RRI in combination with commercially offered Selective Non Catalytic Reduction Processes to lower NOx as much as 60% beyond overfire alone at B.L. England station.

Additional tests recently completed at AmerenUE’s Sioux Unit 1 achieved NOx reductions of over 30%. “These test results are very encouraging and offer us another technology to consider in our system’s NOx control strategy,” said AmerenUE’s Consulting Project Engineer, Dave Boll.

EPRI has licensed the RRI technology to Reaction Engineering International of Salt Lake City, Utah, and implementation licenses have been issued to FuelTech NV and RJM Corporation.

EPRI is currently evaluating RRI for use with pulverized coal boilers.

EPRI, headquartered in Palo Alto, Calif., was established in 1973 as a center for public interest energy and environmental research. EPRI’s collaborative science and technology development program now spans nearly every area of power generation, delivery and use. More than 1,000 energy organizations and public institutions in 40 countries draw on EPRI’s global network of technical and business expertise. Visit the EPRI website at www.epri.com.

Reaction Engineering International, headquartered in Salt Lake City, Utah specializes in computational and experimental analysis of high temperature reacting flows. For more information visit REI’s website at www.reaction-eng.com.

RRI is available from Fuel-Tech, N.V. of Stamford, Conn., www.fueltechnv.com., and RJM Corporation of Norwalk, Conn., www.rjmcorp.com.