Towards Zero Emissions of NO_x and Mercury from Coal-Fired Power Plant

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

• To develop a stage-wise NO_X 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 pr >imary and secondary NO_X 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 contr >ol 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 NO_X, SO₂ and particulate emissions from coal-fired power plant over the next few years. Primary NO_X control measures such as low NO_X burners and air staging and secondary (postcombustion) NO_X control measures such as NO_xStarTM or SCR, in combination, should provide the potential for significantly higher overall NO_X reductions to meet the most stringent emission limits in a more costeffective manner than a stand-alone technology for the same level of NO_X 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 NO_X and mercury will lead utilities to seek greater versatility from existing NO_X 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 NO_X 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.

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Towards Zero Emissions From Coal Fired Power Plant: NOx And Mercury: Project Profile