Caterpillar will offer its gas blending retrofit kit for the 785C mining truck in 2018, reports International Mining. Cat® Dynamic Gas Blending™ (DGB) automatically adjusts to changes in incoming fuel quality and pressure allowing mining truck engines to run on both diesel and liquefied natural gas (LNG), offering lower fuel costs while maintaining diesel power and transient performance.
The online news source says it is the first DGB system Caterpillar has offered for mining machines and will be available for purchase in January 2018 from the global Cat network. The retrofit kit has undergone validation and delivered “excellent results”.
Steve Igoe, Caterpillar’s gas engine business commercial manager, said the company had recently completed validation of the retrofit kit on the 785C mining truck with excellent results. He explained the use of LNG will offer both economic and environmental benefits, reducing the emissions footprint of the mining industry. Kits for other machines will also be introduced.
A fuel substitution rate of up to 85% diesel for LNG could generate very substantial savings for major mine operators. Additionally, the DGB system has no negative impact on service intervals and component life.
The CAT DGB System
The Cat DGB system was developed with the key goal of maximizing diesel displacement for a wide range of gaseous fuel quality at loads ranging from 20% to 90%. When in dual-fuel mode, diesel fuel injection timing is adjusted and optimized automatically to maintain durability and performance of the engine while maximizing diesel displacement. In addition to monitoring detonation, exhaust temperatures, and emissions, the Cat DGB system is designed to not exceed peak cylinder pressures within the engine.
Once commissioned, a Cat DGB system automatically and continuously adjusts diesel displacement to adapt to changing gaseous fuel quality. CAT first introduced DGB systems in 2012.