H-Coal Pilot Plant Block-Valve Experience Runs 8, 9, 10.

摘要

Equipment used in direct liquefaction processes is subjected to mixtures of coal fines, ash, and oil derived from high-sulfur coal in a high-pressure and high-temperature environment. This report reviews the experiences and development of block valves used in high-pressure letdown service and other areas of the H-Coal Pilot Plant in Catlettsburg, Kentucky. Included are block-valve cycle data and information pertaining to seat materials and various coatings and substrates used for the balls. Inspection data obtained after each of the three separate runs (Run Nos. 8, 9 and 10) is presented as the basis for changes and modifications to the valves which resulted in longer run times. Valves from six manufacturers were tested. This report includes information on block valves that performed well and those that failed. (ERA citation 08:035001)