Technical Economy Analysis Of Nitrogen Oxide Control Technologies For The Thermal Power Industry

China was the largest coal consumption country in the world, and its air pollution was very serious. In11th Five-Year Plan Period, it has achieved the SO2emission reduction target of10%below2005by2010, but the emission situation of NOx was still very grim, and it has had a serious impact on China’s economic development and people’s lives. The concrete control plan of NOx total emissions has put forward in the China Environmental Protection in12th Five-Year Plan, the NOx emission reduction target was20.462million tons in2015, should be10%below2010by2015. To achieve the target, NOx emission reduction of the thermal power industry is the most important, because nearly a quarter coal in the world was consumed by the thermal power industry in China, and NOx emissions of the thermal power industry has accounted for half of the country’s NOx total emissions. In addition, according to the forecast, the coal consumption of the thermal power industry will grow in the future, and the NOx emission potential is very huge. In this situation, the thermal power industry is bound to increase control forces about NOx emission, how to choose economically feasible and technically reliable nitrogen oxide control technologies has become an urgent problem for controlling thermal power industry’s NOx emission at present.Technical performance and economic performance of these mainstream nitrogen oxide control technologies for the thermal power industry were analyzed by make use of field research in this paper. The comprehensive technical and economic evaluation index system of nitrogen oxide control technologies was built in consideration of environmental performance, economic performance and technical performance by technical and economic evaluation method. Then, through analytic hierarchy process, the weights of the evaluation indexes were determined. Finally, the technical and economic evaluation model of nitrogen oxide control technologies for the thermal power industry was built by making use of grey multi-hierarchy comprehensive evaluation method which was based on the grey theory. After then, seven kinds of mainstream nitrogen oxide control technologies including air staged combustion technology, fuel staging combustion technology, flue gas recirculation technology, low NOx burner, selective non-catalyst reduction (SNCR), selective catalyst reduction (SCR) and hybrid SNCR/SCR (SNCR-SCR) were evaluated comprehensively by this model. According to the result, the prior sequence of these seven kinds of nitrogen oxide control technologies was got in turn:selective catalyst reduction (SCR), low NOx burner, air staged combustion technology, flue gas recirculation technology, fuel staging combustion technology, SNCR-SCR and SCR. In addition, the model’s rationality and practicability were further discussed, the model was applied to a project and the evaluation results were coincided with the practical application.In brief, there might be some exploring function and a practical signification and reference value to the study of nitrogen oxide control technologies’technical and economic evaluation of the thermal power industry by explaining the indicators system and contents of assessment.