Abstract: A heat load automatic adjustment simulation method was applied for three-point steam injection in a delayed coker furnace. Based on the model，the influence of three-point steam injection rate on the coking degree and heat consumption was analyzed. The results showed that the rate of steam injection affected the heat consumption and the coking degree. Improving the steam injection rate would increase the heat consumption and decrease the coking degree at the same time. The steam injection rate of the first and the second point were sensitive to heat consumption and the coking degree, while the steam injection rate of the the third point had only weakly influence on the heat consumption and coking degree.In practice, the coking degree in the heating furnace can neither be too strong nor too weak, and the appropriate coking degree can ensure the furnace tube pipe not coking in the normal on-stream period and guarantee the economic consumption of methane gas,steam injection at the same time. Through intelligent distribution of heat load and steam injection, more reasonable operation schemes under different oil processing load of the device can be obtained.

Key words: thermal load auto-regulation, Three-point steam Injection, heating furnace, delayed coker