January 2022

Heat Transfer

Gas-side fouling effects on transfer-line exchangers

Transfer-line exchangers (TLEs) are specific shell-and-tube heat exchangers installed out of hydrocarbons steam cracking furnaces for olefins production.

Manenti, G., Alfa Laval Olmi SpA

Transfer-line exchangers (TLEs) are specific shell-and-tube heat exchangers installed out of hydrocarbons steam cracking furnaces for olefins production. Their purpose is to cool process gas coming from the furnace with a minimum residence time—TLEs are also known as quenchers. The quenching is achieved by means of high-pressure vaporizing water as cooling fluid, flowing on the shell side. Up to three TLEs in series can be installed downstream of a furnace coil, depending on the process and feedstock. The first one of the series, called the primary TLE (FIG. 1), is the most critical from an operating and thermal-mechanical standpoint due to harsh operating conditions.

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