Caterpillar Inc.

Michael W Rhoades

Paul M Dunn

An exhaust system with a semi-closed cycle includes a main flow path and having an inlet node, an outlet node, and a recirculation node between the inlet and outlet nodes; an exhaust gas recirculation flow path configured to divert a recirculated exhaust gas from the main flow path, at the recirculation node, and recirculate the recirculated exhaust gas to the inlet node; an engine configured to produce an exhaust gas based on a gas mixture including ambient air and the recirculated exhaust gas; a draft fan configured to control a gas flowrate through the main flow path; a stack flow path coupled to the main flow path; and a pressure control system configured to regulate a fan speed of the draft fan based on a pressure in the stack flow path in order to maintain the pressure in the stack flow path at a target gauge pressure.

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Escondido, CA, United States of America

Michael W Rhoades