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Projects: Projects for Investigator
Reference Number DTI/CC/408
Title Towards Zero Emissions of NOx and Mercury from Coal-Fired Power Plant
Status Completed
Energy Categories Other Power and Storage Technologies(Electric power conversion) 20%;
Fossil Fuels: Oil Gas and Coal(Coal, Coal combustion) 80%;
Research Types Applied Research and Development 100%
Science and Technology Fields ENGINEERING AND TECHNOLOGY 100%
UKERC Cross Cutting Characterisation Not Cross-cutting 100%
Principal Investigator Dr S (Stuart ) Mitchell
No email address given
Technology Centre
Babcock International Group plc
Award Type 3
Funding Source DTI
Start Date 01 October 2004
End Date 01 November 2006
Duration 25 months
Total Grant Value £477,050
Industrial Sectors
Region London
Investigators Principal Investigator Dr S (Stuart ) Mitchell , Technology Centre, Babcock International Group plc (99.996%)
  Other Investigator Project Contact , Chemistry, Imperial College London (0.001%)
Project Contact , PS Analytical Ltd (0.001%)
Project Contact , E.ON UK (formerly PowerGen) (0.001%)
Project Contact , University of Nottingham (0.001%)
Web Site

The overall aim of this project is to investigate and develop an integrated, multi-pollutant control approach that targets major reductions in NOX and mercury emissions from coal-fired plant. The specific objectives of the project are:

  • To develop a stage-wise NOX reduction approach that will enable coal-fired utility boilers to achieve a target of 200 mg/Nm3 or better in the most cost-effective manner.
  • To assess of the combined performance of primary and secondary NOX control measures including particulate control devices and quantify their impact on flue gas mercury concentration and speciation during coal combustion.
  • To investigate the suitability of a range of approaches to the removal of mercury from flue gas (combustion modifications, sorbents, additives etc) and to determine the effect of fly ash properties and flue gas chemistry on mercury behaviour.
  • To develop an integrated multi-pollutant control approach with potential for future application to UK coal-fired power plant (and coal-fired power plant worldwide).

Increasing environmental concerns regarding the use of pulverised coal for power generation continue to drive legislation that limits the emissions of pollutant gases to the atmosphere. The current European Union Large Combustion Plant Directive calls for significant reductions in NOX, SO2 and particulate emissions from coal-fired power plant over the next few years. Primary NOX control measures such as low NOX burners and air staging and secondary (postcombustion) NOX control measures such as NOxStarTM or SCR, in combination, should provide the potential for significantly higher overall NOX reductions to meet the most stringent emission limits in a more costeffective manner than a stand-alone technology for the same level of NOX control. Further, over the past decade there has been increasing concern around the world regarding the impact of mercury on human health and the environment. Itisclear that future, more stringent limits for NOX and mercury will lead utilities to seek greater versatility from existing NOX controls and/or new ECTs that they plan to install, while at the same time reducing costs. It is therefore critical to develop a better understanding of the chemical and physical processes that will enable the combined capture of these pollutants either directly or by altering the flue gas chemistry. The current project targets the development ofa hybrid process for significantly reducing both NOX and mercury emissions. A stage-wise approach is being applied that seeks to gain a better understanding of the chemical and physical processes involved in the capture of the pollutants, leading to the development of an integrated, multi-pollutant strategy for meeting emission legislation in the most cost-effective manner.

Publications DTI (2005) Towards Zero Emissions From Coal Fired Power Plant: NOx And Mercury: Project Profile 366. DTI Cleaner Coal Technology Programme, URN 05/960, DTI, UK (PDF 7435 KB)
Final Report (none)
Added to Database 01/01/07