| 摘要 |
<p>A fast fluidized bed reactor comprises a reaction chamber 10 having a lower region 11 containing a bed of granular material, a cylindrical upper region 18 and an inlet 17 for feeding matter to be reacted into the lower region of the reactor. In operation the bed of granular material is fluidized in the fast regime by a first stream of pressurized air supplied through a plurality of openings 12 at the base of the lower region 11 and at least a portion of the granular material is continually entrained into the upper region 18. To increase the reaction rate, a second stream of pressurized air is supplied tangentially into the upper region 18 through openings 19 so as to create a cyclone of turbulence and to maintain therein a Swirl number of at least 0.6 and a Reynolds number of at least 18,000, and at maximum operating capacity of the reactor, the second stream of air should constitute at least 50% of the total pressurized air fed to the reactor. At the end of the upper region 18 is a cylindrical exit throat 5 which is aligned concentrically with the upper region and which has a smaller diameter with respect thereto such that at least one reverse flow zone is created in the upper region which returns granular material to the lower region 11, thereby retaining substantially all of the granular material in the reaction chamber 10, while permitting the reaction gases in the upper region to exit from the chamber 10 </p> |
