CCS and Power Systems
Advanced Energy Systems - Gasification Systems
Performer: National Energy Technology Laboratory
Project No: FWP-2012.03.03
Researchers at West Virginia University (WVU) have developed a rules-based partitioning spreadsheet ROM to predict gasifier performance. The ROM can be used to predict the solids mass fraction that adheres to the slag and the fraction that leaves the gasifier in the fly ash. A HPEFR has been commissioned at Penn State and the fuel feeder has been tested with coal particles of various sizes and very consistent flow was observed for both atmospheric and pressurized (100 pounds per square inch) flow. Researchers at Carnegie Mellon University (CMU) have completed viscosity measurements of coal/petcoke slag mixtures with good experimental reproducibility. The resultant slags are being analyzed by researchers. The ash deposition ROM developed for the industrial convective syngas cooler is being used to help determine how the High Pressure Tubular Reactor deposition studies at atmospheric pressure will relate to the actual particle deposition process at higher pressures relevant to domestic integrated gasification combined cycle (IGCC) plants.
Also at CMU, the x-ray diffraction and scanning electron microscope (SEM) analyses of the crystalline phases precipitated during viscosity measurements from the four coal, petcoke, or coal/petcoke carbon feedstock mixtures (100 percent eastern coal, 100 percent western coal, 50 percent eastern coal+50 percent petcoke, 50 percent western coal+50 percent petcoke) have been completed. An improved flowing slag film model that will account for the flux of ash into the slag film distributed over the entire slag-syngas interface is being developed. This model will be used as part of the heuristic coal partitioning model currently undergoing refinement. Predictions of the axial slag thickness distribution were obtained for a range of constant gasifier temperatures and for ash of various chemistries/viscosities. Four slags were designed for plastic flow modeling, viscosity measurements were conducted and the slags analyzed using the SEM, and the conversion of troilite (FeS) to ferrous oxide (FeO) was evaluated in a specially designed thermogravimetric analysis sample holder.