Experimental study on airflow characteristics of biomass hot water stove
Biomass hot water hot air stove has the characteristics of stable and clean combustion, and has a simple structure and good load adaptability. The biomass particle furnace gas cyclone burner is divided into two types: intake air and circumferential intake air. . With the advancement of swirl combustion, gas swirl burners are developing in a direction suitable for the mixed combustion of multiple combustible gases. In order to study the gas flow characteristics of the new gas swirl burner, an experimental platform for a double swirl gas swirl burner was established.
In this paper, a two-dimensional hot wire anemometer was used to measure the cold flow field, and the distribution law of aerodynamic field was obtained when different flares were installed on the burner outlet. Adaptability, in order to further understand the stable combustion characteristics of the burner when installing the expansion and expansion, and provide detailed experimental data for the design of the multi-component gas burner.
Under the rated load of biomass hot water stove, the influence of different flaring structures on the turbulence intensity is shown in 7. After flaring is removed, and the turbulence intensity is higher than when the zoom flaring is installed, but in its recirculation zone, the attenuation is severe. After the installation of tapered flaring, the overall turbulence intensity is lower near the outlet of the biomass burner, and farther away from the outlet (Y 0010010 gt; 2. 5), Its overall level is higher than the case of installation of zoom flaring. The main reason is that the tangential velocity is relatively large near the outlet. Although there is also decay / J, the tangential velocity still has a relatively high value relative to the axial velocity after being away from the outlet, which makes the turbulence intensity greater, which is conducive to the mixing of airflow And the burning of fuel. After the installation of tapered flaring, the value of the turbulent intensity of the flow field at the outlet of the biomass hot-water stove is not present in the recirculation zone, but increases suddenly after the gas moves away from the reflow zone. This is mainly because the reflow zone is very small and the reflow speed value is also very low.