Mixing Behaviors of Jets in Cross-Flow for Heat Recovery of Partial Oxidation Process

In our previous work, a new technology has been proposed that the cooled synthetic gas (syngas) produced in the partial oxidation process can be used as quenching medium. The mixing of the hot product gas and cold syngas is critical to this new quenching approach. In this work, both experimental measurements and CFD simulations were conducted to study the mixing behavior of the jets in cross-flow (JICF). A mixing apparatus with four jets was set up. Methane was used as the tracing gas and the concentration distribution was measured using an FID detector. The realizable k-epsilon model was found to give better predictions of the experimental data among the three k-epsilon models. The effects of jet incident angle theta, jet velocity to mainstream velocity ratio VR and Reynolds number on the mixing behavior were investigated. The results showed that the optimum jet incident angle was 145 degrees. For configuration with jet incident angle smaller than 130 degrees, increasing the velocity ratio VR in the range of 1-3 improves the mixing. When the jet incident angle is larger than 130 degrees, the optimized range of velocity ratio VR is 1.8-2.4. The Reynolds number has insignificant effect on the spatial distribution of mixedness, indicating that the optimum design parameters obtained at low Reynolds number can be used to guide the choosing of industry operating conditions with Reynolds number as high as 3.13x10(5)-6.26 x 10(5).