Experimental Program for the Development of Peat Gasification. Task 2. Hydrogasification. Task 3. Fluidized-Bed Tests. Interim Report No. 7, October 1, 1978-July 31, 1979

摘要

Thirty tests were conducted in an entrained-flow hydrogasification process development unit (PDU) with Minnesota, North Carolina, and Maine peats to determine the effects of temperature, hydrogen partial pressure, residence time, and particle size on the product distribution and yields. These tests were conducted at temperatures of about 1000 exp 0 to 1500 exp 0 F, hydrogen partial pressures of 0 to 250 psia, residence times of 2 to 30 seconds, and particle sizes of -10 + 100, -10 + 20, and -60 + 120 mesh. The results show that overall carbon conversion and hydrocarbon gas yield for the Minnesota peat are about 20% and 50% higher than those for North Carolina and Maine peats, respectively. The liquid fuel yields from all three peats are similar. Seventeen gasification tests were conducted in a 6-inch-diameter fluidized-bed reactor with steam and oxygen. These tests were conducted with raw peat as well as with chars of the peats from Minnesota, North Carolina, and Maine. The objectives of these tests were to determine the effects of temperature, pressure, and steam/feed carbon mole ratios on the gasification characteristics of peats and peat chars. The tests were conducted at pressures, temperatures, steam/feed carbon mole ratios, and fluidization velocities in the ranges of 123 to 544 psia, 1600 exp 0 to 1850 exp 0 F, 0.7 to 2.6, and 0.4 to 1.0 ft/s, respectively. Carbon conversions as high as 96% were achieved. Tests were also conducted to determine the effect of temperature and fluidization velocity on the sintering characteristics of peat chars. All the data from hydrogasification PDU tests and char gasification PDU tests have been correlated. The unified kinetic description of the three peats is presented. (ERA citation 05:023424)