Systems and methods for reducing heat exchanger fouling rate

A method for polymerizing olefins comprising:

• contacting one or more olefins with a catalyst under polymerization conditions in a polymerization reactor to form a first gas stream comprising solid fines and unreacted olefins;
• providing the first gas stream to a gas outlet line;
• removing a portion of the solid fines from the gas outlet line to form a bypass stream comprising a higher concentration of the solid fines than is present in the first gas stream;
• providing the bypass stream to a bypass line comprising a bypass line inlet and a bypass line outlet, wherein the bypass line inlet is located upstream of a first heat exchanger, and wherein the bypass line outlet is located downstream of the first heat exchanger;
• providing at least a portion of the first gas stream to the first heat exchanger, which produces a first cooled gas stream;
• and
• combining the bypass stream and a second gas stream at the bypass line outlet to form a combined gas stream comprising one or more olefins or paraffins,
• wherein a temperature of the combined gas stream is below the dew point of the combined gas stream.