Gas-Solid Two Phase Flow in Internally Circulating Two-Stage Spouted Desulfurization Tower
To study the circulating fluidized bed desulfurization tower flowing fields, a two-stage spouted tower was presented and an experimental installation was established. Experimental studies on flow fields have been carried out by using a particle dynamic analyzer (PDA). Results indicate: The stable annular flow patterns is obtained in the two-staged esulphurized tower. The irregular and uniform flow is advantage to strength mass transfer at the Veturi inlet of tower. The result of stable back flow of particle at the wall makes it possible that atomizing humidified water or slurry can not directly eject the wall of the tower. At the assurance of atomized covering area, the fact ensures that humid scaling will not be produced at the wall. Micro-particle in gas can be arrested stable dynamic particle layer forming from the particular two stages spouted structure combined proper aggregate accelerating agent.
Gas/particle flow characteristics of two swirl burners
Abstract A three-component particle-dynamics anemometer is used to measure, in the near-burner region, the characteristics of gas/particle two-phase flows with a centrally fuel rich swirl coal combustion burner and enhanced ignition–dual register burner, on a gas/particle two-phase test facility. Velocities, RMS velocities, particle mean diameters and particle volume flux profiles were obtained. For the centrally fuel rich burner, particles penetrate the central recirculation zone partially, and are then deflected radially. For the enhanced ignition–dual register burner, particles completely penetrate the central recirculation zone. Compared with the enhanced ignition–dual register burner, in the same cross-section, the particle volume flux peak value for the centrally fuel rich burner is much closer to the chamber axis and much larger near the chamber axis. In six cross-sections from x / d  = 0.3 to 2.5, the particle volume flux in the central recirculation zone for the centrally fuel rich burner is much larger than that for the enhanced ignition–dual register burner. For the centrally fuel rich burner, most of bigger particles are resident in the region near the chamber axis and the residence time is prolonged. The influence of gas/particle flow characteristics on combustion has been analyzed.
Stability limits of pulverized coal firing
Presentation et discussion de resultats d'essais effectues sur un bruleur double concentrique dans le but d'etudier l'influence de differents parametres de fonctionnement sur le decrochage de la flamme