Combination exhaust stack and flare systems and methods

A hydrocarbon processing site comprising:

• an internal combustion engine configured to, during operation, generate an exhaust gas;
• a hydrocarbon processing component configured to:
• receive a process fluid;
• output a first portion of the process fluid via a first outlet;
• and
• output a second portion of the process fluid via a second outlet;
• and
• a combi-flare comprising:
• an exhaust stack of the internal combustion engine, the exhaust stack configured to receive the second portion of the process fluid and the exhaust gas, wherein the second portion of the process fluid and the exhaust gas operationally mix within the exhaust stack;
• and
• a flare section configured to generate a flame to burn a mixture of the second portion of the process fluid and the exhaust gas, wherein the exhaust gas is a product of combustion in the internal combustion engine, and the second portion of the process fluid comprises one or more speciated organic gases (OGs).