AIR-MOLTEN CARBONATE SALT TWO PHASE FLOW CHARACTERISTICS IN A MOLTEN SALT OXIDATION REACTOR

摘要

IntroductionMolten salt oxidation process developed by RockWell International as a coal gasification tool, and now a days has been used for the destruction(or oxidation) of mixed wastes, chemical warfare agents, medical wastes and energetic materials such as explosives and propellants has been studied for the destruction of difficult-to-treat waste[1]. The basic concept of molten salt oxidation is to (1) introduce wastes and air into molten salt bed, (2) oxidize organic wastes in the molten salt bed, (3) retain inorganics in the molten salt, and (4) remove the salt for disposal or for processing and recycling.For the proper design, scale-up and operation of the molten salt oxidation process, knowledge on the hydrodynamics is essential because the hydrodynamics strongly effect on the oxidation efficiency of the molten salt oxidation process[2]. However, there has been little attention on the air-molten salt two-phase flow system until now, even on the basic hydrodynamics. One of the most important hydrodynamic parameters for the proper design of the molten salt oxidation is the gas holdup. It can directly affect the operation efficiency. Thus, in this present study, the effects of the gas velocity and the temperature on the gas phase holdup have been investigated. Furthermore, the differential pressure fluctuations have been measured and analyzed by means of a spectral analysis to describe the flow characteristics with a variation of the operating conditions.