Linear transfer line exchanger for ethylene plants

In ethylene production, the rapid cooling of cracked gas exiting the furnace is vital to prevent recombination reactions and to stabilize products. This process requires equipment that can efficiently and uniformly quench high-temperature gases from multiple furnace outlets.

Rapid cooling of cracked gas

The BORSIG Linear Transfer Line Exchanger (BLQ) is designed to rapidly cool the cracked gas in ethylene plants. The BLQ consists of linearly arranged double pipe elements, each directly coupled to a furnace radiant coil outlet. This design ensures individual quenching for each radiant coil, improving efficiency and process control. The BLQ uses a common downcomer header to distribute circulating boiler water to each Turbo flow inlet chamber and collects the steam-water mixture through a riser header. Benefits of this system include a compact, modular design, elimination of fittings, low gas side volume leading to minimal residence time, and low overall pressure drop. It also allows for online decoking and offers various configurations to accommodate space constraints. BORSIG Process Heat Exchanger GmbH has manufactured over 6,000 BLQ units with more than 29,000 double pipes globally since 1990.

Benefits

  • Compact and modular design
  • Direct quenching for each radiant coil
  • Eliminates complex fittings
  • Allows online decoking
  • Low overall pressure drop

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