Pipeline Gas from Coal: Hydrogenation (IGT Hydrogasification Process). Quarterly Report No. 10, October 1-December 31, 1978

摘要

Tests 75 and 76 were completed. Test 77 was still in progress at the end of December. Test 75 marked the return to high-pressure (900-psig) operation following successful low-pressure (500-psig) operation of the HYGAS reactor during Tests 71 through 74. The initial operating conditions for Test 75 were designed to explore different steam distributions between the fluidizing ring and the steam-oxygen distributor. These conditions were achieved before a leak at the Grayloc flange leading to the steam-oxygen gas distributor forced the early termination of the test. Test 76 involved operation at high pressure (900 psig) and commercial/demonstration plant design steam-to-char and oxygen-to-char ratios. Several steady-state periods were selected for detailed study, and preliminary data from these periods are presented. The objective of Test 77 is to test the gasification behavior of Peabody No. 10 Mine caking bituminous, ROM coal at a 500-psig operating pressure, steam feed rates of 500 lb/hr, and 85% char conversion. Initial pretreater operation with ROM coal was sluggish; solids flow from the pretreater to the char cooler was poor. The pretreater was inspected, and the problem was solved by experimentally determining that ROM coal has a higher complete fluidization velocity than the washed coal from the same mine that had been used in previous tests. Increasing the superficial velocity in the char cooler and reducing the operating temperature in the pretreater reactor vessel significantly improved pretreater operation. (ERA citation 05:025148)