Patent ID: 7434387

Claim:
A method of operating a power generation system, comprising: operating a diesel engine to produce power and exhaust containing particulate matter and NOx; passing the exhaust through a combined DPF-fuel reformer, thereby removing a majority of the particulate matter from the exhaust, the particulate matter accumulating in the DPF-fuel reformer; passing the exhaust through a LNT that adsorbs and stores NOx from the exhaust; from time-to-time, issuing a control signal to regenerate the LNT to remove stored NOx; in response to the control signal, injecting fuel into the exhaust upstream of the combined DPF-reformer at a rate that leaves the exhaust lean, whereby the injected fuel combusts in the combined DPF-reformer, warming the combined DPF-reformer; and in a rich phase following warming the combined DPF-reformer, injecting fuel into the exhaust at a rate that leaves the exhaust rich, whereby the DPF-reformer produces reformate and the LNT is regenerated; wherein with every LNT regeneration the combined DPF-reformer undergoes a regeneration that removes accumulated particulate matter.