关键词: 两段炉, 压降, 速度分布

Abstract: The two-stage gasifier with heat recovery via chemical energy can improve heat recovery of high-temperature syngas effectively. In order to understand the flow pattern in the new two-stage gasifier, a cold model experimental device was set up. The pressure drop of second stage and velocity distribution in the gasifier were examined. The results showed that Montiller empirical equation could accurately predict the pressure drop of the second stage. When gas reached the bed surface of the second stage, an impact region was formed. The axial velocity attenuation equation of single nozzle on the top and downward radial velocity attenuation equation of four nozzles impacting were fitted out. Regarding the radial distribution of axial velocity, the center axial velocity appeared to be the largest and decayed the fastest. The distance of axial position from pipe flow region of four nozzles impacting was shorter than single nozzle on the top by 1.8D.

Key words: two-stage gasifier, pressure drop, velocity distribution