Patent ID: 7536252

Claim:
A method of controlling an exhaust stream, wherein the exhaust stream is generated by a turbomachine; the method comprising: providing at least one exhaust gas recirculation (EGR) system comprising: at least one EGR flow conditioning device, a constituent reduction system, at least one flow control device; wherein the at least one EGR flow conditioning device increases the flowrate of the exhaust stream and comprises a source of air; wherein the source of air comprises a fan; wherein the EGR system reduces constituents within the exhaust stream from a first concentration to a second concentration and recirculates the exhaust stream to an inlet section of the turbomachine; receiving a target EGR fraction comprising the portion of the exhaust stream within an inlet fluid, wherein the inlet fluid enters the inlet section of the turbomachine; determining a target level of at least one constituent from the target EGR fraction; determining a current level of the at least one constituent; determining whether the current level of the at least one constituent is within a constituent range; and adjusting an EGR rate of the exhaust stream if the at least one constituent is outside of the constituent range.