| 摘要 |
PURPOSE:To reduce the size of equipment to a marked extent, control formation of coke in a heat exchanger and recover high-temperature and high-pressure steam, by employing a special indirect heat exchanging device equipped with a triple tube, for cooling of products of thermal cracking of heavy hydrocarbon oil. CONSTITUTION:In the treatment of products of thermal cracking of heavy hydrocarbon coil, the product in the form of a mixt. is led into a heat exchanger A through an inlet pipe 5 of an outer tube 1 without gas/liquid separation and is discharged from a heat exchanger B through a discharging pipe 6 of the outer tube 1. Cooling water introduced through an inlet 10 of a distributing pipe 1 flows down in inner pipes 3 of respective double tubes 2 and flows upward in outer pipes 4 of double tubes 2 to perform indirect heat exchange with the thermal cracking product at a high temperature passing through the outer tube 1 and produce high-pressure and high- temperature steam, which is discharged through a discharge pipe 9 provided at top of the outer pipe 4 of the double tube 2. The thermal cracking product quenched by the heat exchange is discharged through a discharge pipe 6 of the outer tube 1 of the heat exchange B. Resulting liquid thermal cracking oil is subjected to steam distillation.
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