1. The SERT is inserted only in a small part of the radiation section of the cracking furnace, so compared with the conventional methods that use heat transfer intensified tube in the whole or half of the tube length, the increase of pressure-drop is significantly reduced, and the manufacturing cost is lower.
2. Under the same operation conditions, with insertion of the tube with twisted-tape, the temperature at the tube wall can be reduced by at least 20 ºC and the operation cycle of cracking furnace is extended by at least 40%.
3. Under the same operation conditions with the same cycles, the throughput of cracking furnace can be increased by about 7%.