Coal-Gasification Research Studies. Quarterly Report, November 20, 1982-February 19, 1983 (Needle Penetometer Viscometer)

摘要

The Coal Gasification Research studies consist of three tasks: (1) studies of coal ash behavior, (2) high-pressure fluidization studies, and (3) high-temperature fluidization studies. The studies in coal ash behavior include a determination of the chemical and physical changes of the mineral constituents of coal during gasification, the construction and use of a needle penetrometer viscometer to measure the viscosity of coal ash melts and the analysis of ash agglomeration based on available phase equilibria. The fluidization studies are to determine the individual effects of pressure and temperature on the bubble characteristics (bubble size, frequency, and velocity) as a function of the fluidization velocity, particle size, particle density, bed height, and type of gas distributor. The high-pressure fluidization studies also include investigations on the effect of pressure on the operation of high-velocity fluidized beds. During this quarter, the needle penetrometer viscometer that is to be used to measure coal ash viscosities above 10 exp 4 poises was assembled and the testing plan finalized. The 2-inch-diameter fluidized-bed gasifier used to monitor chemical changes in ash constituents was modified to provide for intermittent sampling of solid bed material and to analyze the effluent gas for H sub 2 O, H sub 2 , CO, CO sub 2 and light hydrocarbon composition. In addition, the test plan for the ash characterization subtask was formalized. The modification of an existing high-pressure fluidization facility continues. Development of the mathematical expressions that relate pressure probe data to bubble-size distribution in the fluidized bed was completed and a computer program based on these expressions will be developed to perform data analysis. Modifications of the existing high-temperature unit to study bubble characteristics continues. 6 figures, 1 table. (ERA citation 08:038346)