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Doosan holistic in-furnace Nox control
Efficiencies of 80% can be achieved when reburn is added to SNCR and other combustion modification technologies. This article appearing in Power Engineering is more complete than the table and slides provided by Bin Xu in the July 19 webinar. SNCR removal efficiency is provided for a number of operating units. The table provides a good overview of the various combustion modification and SNCR combinations. Reburn offers slightly higher efficiencies than FGR in the various combinations.
Revision Date: 7/18/2016
Tags: PacifiCorp, Doosan, NOx, SNCR, Reburn
Fuel –lean gas reburn injects gas in specific locations for optimum Nox reduction results. Since FLGR does not require a physical change to the main combustion system, it requires a relatively low capital cost, typically less than $8/kW. FLGR is different from conventional gas reburning systems because gas is injected in a manner that optimizes the furnace’s stoichiometry on a very localized basis. The process avoids creating a fuel-rich zone and maintains overall fuel-lean conditions. Efficiency improvements of up to 30 % are possible.
Revision Date: 7/18/2016
Tags: PacifiCorp, Breen Energy Solutions, Natural Gas, NOx, Reburn
Gasified sewage sludge as a reburn fuel
Gasified sewage sludge has been evaluated as a reburn fuel to reduce NOx in Polish coal fired power plants. New regulations in Poland relative to sewage sludge disposal combined with the large number of Polish coal fired plants encourage consideration of alternatives such as the gasification and use of sewage sludge as a reburn fuel. This paper presented at a 2013 water conference shows results of laboratory tests showing up to 40 % Nox removal. However, there is no claim that this reburn fuel would be more efficient than natural gas. The paper also references the use of gasified municipal solid waste and other biomass. The paper references successful gas reburn in European coal fired boilers including the system at Longannet. Successful reburn examples in MSW and other combustion facilities are also noted.
Revision Date: 7/18/2016
Tags: PacifiCorp, NOx, Reburn
Using natural gas in coal fired boiler
Using gas to replace coal or to supplement coal or just for gas reburn can be economically attractive . In 2012 Riley Power Inc. (RPI part of Babcock Power) in conjunction with a major Southeast utility conducted a week-long program to test the boiler’s ability to fire full load natural gas in an existing RPI low NOx coal-fired burner. The goal was to determine the ability of the equipment to meet steam load requirements and emissions requirements. The result of this investigation is that the unit can achieve the original steam flow capacity and meet the current emissions regulations. However, substantial control changes will be necessary to ensure the unit can operate automatically on load control.
Revision Date: 7/15/2016
Tags: PacifiCorp, Babcock Power, Natural Gas, NOx, Low NOx Burner, Reburn