Experimental Study And Numerical Simulation On Rich-lean Gas-solid Flow In Swirl Burner

Energy and environment are important issues of human development constraints, and as the most widely used combustion equipment of the energy industry, the well running boiler state is the guarantee for economic benefits and safety. Among the boiler equipments, burner is major equipment for high combustion efficiency. In the past few decades, many scientists and engineers have done a lot of research for this area and developed a different burner. And rich-lean burner as the most efficient burner in the energy industry has been most widely used. This article studies the gas-solid distribution of the outlet of rich-lean swirl burner firstly by numerical simulation method, compared with experimental method. The article also describes the principle of laser wave method, a new meaning method. A new measuring method: laser wave method, and then researches on the characteristics of gas-solid flow of rich-lean burner under the experimental conditions.Through constructing cold model test bench, the text makes a research on the diffusion characteristics of the gas-solid distribution of the out let of swirl burner. In the experiment mainly for the following work:1) In accordance with the principles of Cold Modeling, the 12 model of the swirl burner were designed modeling to determine the mode chemical conditions. Using fluent software the text simulates the gas phase flow field and the gas-solid distribution of the burner outlet.2) After constructing the test bench as required, the experiment stimulates the movement of coal in the use of talc to the pipe in the primary air duct. At the same time, to study the influence of the elbow and the block on the concentration distribution of the burner outlet, the crescent block and the triangle block are added in the elbow of first wind.3) According to the principles of Cold Modeling, the article modeling designs the 1:4 rich-lean swirl burner and plans the test bench, performs measurement of gas flow field test in the case without powder and gets the result of the speed of recirculation zone of the outlet of the whirl burner by the use of piton tube and hot wire anemometer., all of which lays the foundation for the future of gas-solid study.4) Through the powder circulatory system set up by the test bench, the experiment measures the concentration distribution and diffusion characteristics of gas-solid distribution of the swirl burner outlet by the application of laser wave method, obtaining the chart of the concentration and size distribution of the burner outlet under different conditions. And then the article also analyses the diffusion characteristics of the gas-solid distribution of the whirl burner outer in the different situation.