Integration and testing of hot desulfurization and entrained-flow gasification for power generation systems. Phase 2, Process optimization: Volume 2, Study of zinc titanate desulfurization sorbents.

摘要

The Research Triangle Institute performed four high-temperature desulfurization tests of zinc titanate sorbents for Texaco, Inc. Two zinc titanate sorbents (L-3196 and L-3014) were tested in fixed-bed mode with simulated oxygen-blown (medium Btu) and air-blown (low Btu) Texaco gas. The zinc titanate sorbents were manufactured as 3/16-in. cylindrical extrudates by United Catalysts, Inc. Tests were performed in a high-temperature, high-pressure, fixed-bed sorbent test unit originally constructed and used on Department of Energy (DOE) contract DE-AC21-86MC23126, DOE Office of Fossil Energy, Morgantown Energy Technology Center (METC). The test unit is described in detail in the December 1988 final report for this contract. Of the four tests conducted, two tests were conducted for the L-3014 sorbent and two tests were conducted for the L-3196 sorbent. The main difference between the two sorbents was their zinc to titanium molar ratio (0.8 for L-3014, 1.5 for L-3196). Properties of these sorbents are described in detail in the Final Report for DOE Contract No. DE-AC2l-86MC23126. Two tests were conducted for each sorbent; one test was conducted with simulated Texaco air-blown gasifier gas and one test was conducted with simulated Texaco oxygen-blown gasifier gas. Each test consisted of five cycles. Each cycle was composed of reductive regeneration, sulfidation, and oxidative regeneration steps. After the fifth sulfidation and after the fifth oxidative regeneration of each test, samples were collected and sent to Texaco. In the following sections, the test procedures are briefly described followed by details of the important results.