Numerical Research And Experimental Study On DeNOx Technology Of Pulverized Coal Boilers

In electric power industry, pulverized coal boiler is one of the power equipment which is widely used. It is very important because of its extensive occurrence in industry and in people's living life. People have paid more and more attention to the pollution of environment. And so, the emission of nitrogen oxide of the pulverized coal boilers is also becoming an environmental problem to be solved.But now, the research of boiler's deNOx technology is only based on some sub-scale experiments and the accumulated experience in operations of utility furnaces. Such experience and data are limited to solve the problem.Air staged combustion and reburn technology are the popular deNOx technologies used in the world. But the development of them is limited by the sub-scale experiment. With the fast development of computer, the numerical simulation of combustion has been an important means to the combustion theory research. By using the Fluent software, the problems of turbulent flow, heat transfer, combustion and the generation of pollutants are calculated. Combined with the experiment, the influence to the NOx emission of boiler by different combustion methods like air staged combustion and reburn method is studied in this article. In the proper way, we do some adjustment to the burner. The quantity of air injected to the furnace through each spout of the burner is changed. And the NOx emission is cut down.It is found that with air staged combustion, about 30 percent of the amount of NOx emission could be reduced. And reburning with fine coal powder could decrease about 40 percent of the amount of NOx emission.