Impact of 80% F-76/20% Hydrotreated Depolymerized Cellulosic Diesel (HDCD-76) on Coalescence.

摘要

An 80% petroleum F-76/20% Hydrotreated Depolymerized Cellulosic Diesel (HDCD-76) (by vol.) blend is currently undergoing qualification testing. HDCD-76 is produced from cellulosic feedstocks such as wood chips, switch grass or corn stover. HDCD-76 is comprised of a mixture of dicyclic and tricyclic alkanes, and mono, di and tricyclic aromatics. HDCD-76 is made up of a complex mixture of many different hydrocarbon compounds that are found in the boiling point range of typical F-76. Most of these compounds are found naturally in petroleum based fuels. The 80% F-76/20% HDCD-76 fuel blend's ability to coalesce free water was evaluated by performing a Navy Coalescence Test (NCT). The NCT is a level II fit-for-purpose test which uses a specially manufactured scaled down filter/coalescer and separator to simulate the performance of a full-scale filter separator system. This test is designed to predict the performance of new additives and fuels on filter separator systems currently in use by the fleet. After 80 hours of testing 80% F-76/20% HDCD-76 met the acceptable performance criteria. It is recommended 80% F-76/20% HDCD-76 proceeds to full-scale single element testing. In the interim, 80% F-76/20% HDCD-76 qualification testing should continue.