A system, comprising: a solvent gas processing system, comprising: a high pressure reaction vessel configured to remove an acid gas from an untreated feed gas using a liquid solvent in a lean solvent fluid stream, wherein the high pressure reaction vessel is configured to output a treated clean gas and a first flow of a high pressure fluid stream comprising the liquid solvent having absorbed acid gas from the untreated feed gas via a first flow path; a turbine having a main nozzle and an outlet, wherein the main nozzle is configured to receive a second flow of the high pressure fluid stream from the first flow path via a main flow path, and wherein the second flow of the high pressure fluid stream is configured to drive the turbine; characterized in that the turbine further has an auxiliary nozzle, wherein the second flow of the high pressure fluid stream is a portion of the first flow; and that the solvent gas processing system further comprises an auxiliary nozzle valve disposed along an auxiliary flow path, wherein the auxiliary nozzle valve is configured to control a third flow of the high pressure fluid stream into the auxiliary nozzle of the turbine, and wherein the third flow of the high pressure fluid stream is a portion of the first flow. a solvent gas processing system, comprising: a high pressure reaction vessel configured to remove an acid gas from an untreated feed gas using a liquid solvent in a lean solvent fluid stream, wherein the high pressure reaction vessel is configured to output a treated clean gas and a first flow of a high pressure fluid stream comprising the liquid solvent having absorbed acid gas from the untreated feed gas via a first flow path; a turbine having a main nozzle and an outlet, wherein the main nozzle is configured to receive a second flow of the high pressure fluid stream from the first flow path via a main flow path, and wherein the second flow of the high pressure fluid stream is configured to drive the turbine; a high pressure reaction vessel configured to remove an acid gas from an untreated feed gas using a liquid solvent in a lean solvent fluid stream, wherein the high pressure reaction vessel is configured to output a treated clean gas and a first flow of a high pressure fluid stream comprising the liquid solvent having absorbed acid gas from the untreated feed gas via a first flow path; a turbine having a main nozzle and an outlet, wherein the main nozzle is configured to receive a second flow of the high pressure fluid stream from the first flow path via a main flow path, and wherein the second flow of the high pressure fluid stream is configured to drive the turbine; characterized in that the turbine further has an auxiliary nozzle, wherein the second flow of the high pressure fluid stream is a portion of the first flow; and that the solvent gas processing system further comprises an auxiliary nozzle valve disposed along an auxiliary flow path, wherein the auxiliary nozzle valve is configured to control a third flow of the high pressure fluid stream into the auxiliary nozzle of the turbine, and wherein the third flow of the high pressure fluid stream is a portion of the first flow. the turbine further has an auxiliary nozzle, wherein the second flow of the high pressure fluid stream is a portion of the first flow; and that the solvent gas processing system further comprises an auxiliary nozzle valve disposed along an auxiliary flow path, wherein the auxiliary nozzle valve is configured to control a third flow of the high pressure fluid stream into the auxiliary nozzle of the turbine, and wherein the third flow of the high pressure fluid stream is a portion of the first flow.