Semi-closed cycle chilling optimization for carbon capture system

An exhaust system with a semi-closed cycle, comprising:

• a main flow path configured to carry one or more gases, wherein the main flow path has an inlet node, an outlet node, and a recirculation node arranged between the inlet node and the outlet node;
• an exhaust gas recirculation (EGR) flow path coupled to the main flow path and configured to divert, at the recirculation node, a recirculated exhaust gas from the main flow path and recirculate the recirculated exhaust gas to the inlet node;
• an engine arranged on the main flow path downstream from the inlet node, wherein the engine is configured to receive a gas mixture including ambient air and the recirculated exhaust gas, produce an exhaust gas, and output the exhaust gas and the recirculated exhaust gas in an exhaust stream;
• a direct contact cooler (DCC) arranged on the main flow path downstream from the engine, for receiving the exhaust stream, and upstream from the recirculation node and the outlet node, wherein the DCC is configured to quench the exhaust stream to lower a temperature of the exhaust stream;
• and
• a condenser arranged on the main flow path downstream from the DCC and upstream from the recirculation node and the outlet node, wherein the condenser is configured to condense the exhaust stream such that the exhaust stream is cooled further and such that water is removed from the exhaust stream.

An exhaust system with a semi-closed cycle, comprising:

• a main flow path configured to carry one or more gases, wherein the main flow path has an inlet node, an outlet node, and a recirculation node arranged between the inlet node and the outlet node;
• an exhaust gas recirculation (EGR) flow path coupled to the main flow path and configured to divert, at the recirculation node, a recirculated exhaust gas from the main flow path and recirculate the recirculated exhaust gas to the inlet node;
• an engine arranged on the main flow path downstream from the inlet node, wherein the engine is configured to receive a gas mixture including ambient air and the recirculated exhaust gas, produce an exhaust gas, and output the exhaust gas and the recirculated exhaust gas in an exhaust stream;
• an EGR fan arranged on the EGR flow path and configured to regulate a flowrate of the recirculated exhaust gas to the main flow path based on a gas concentration of a target gas in the main flow path, wherein the target gas is an oxygen gas or a CO2 gas;
• a filtration unit arranged on the EGR flow path between the EGR fan and the inlet node, wherein the filtration unit includes hydrophobic filter elements that are configured to remove entrained water and solid particulates from the recirculated exhaust gas;
• and
• a condenser arranged on the EGR flow path between the EGR fan and the filtration unit, wherein the condenser is configured to condense the recirculated exhaust gas such that the recirculated exhaust gas is cooled and such that water is removed from the recirculated exhaust gas.