Steam cracking method utilizing electricity for providing energy
The present invention provides a method of steam cracking using electricity to supply energy. This method is to provide energy for steam cracking reaction of a cracking raw material by electromagnetic induction with electricity; the cracking raw material comprises one or more of naphtha, cycloalkane and cycloolefin; wherein the cycloalkane is a C4-C8 cycloalkane, and the cycloolefin is a C4-C8 cycloolefin. The present invention utilizes electricity to provide energy for the steam cracking reaction through an electromagnetic coil, which is a new use of electricity and solve the current problem of excess electricity. Moreover, utilizing the electromagnetic coil to provide power can make the heat distribution in the furnace tube of the cracking furnace more uniform, and it is easier to control the reaction temperature and the progress of the reaction.
1 . A method of steam cracking comprising supplying energy to a cracking raw material by electromagnetic induction, comprising:
steam cracking the cracking raw material by heating a steam cracking reaction tube by means of an induction coil wrapped around outside the steam cracking reaction tube;
wherein a frequency of a current inputted into the induction coil is 5-20 KHz;
wherein conditions for the steam cracking include a reaction temperature of 500-1,200° C., a steam to hydrocarbon ratio of 0.3-0.7, and a residence time of 0.1-1 seconds; and
wherein a cracking raw material comprises cyclohexene and cyclohexane in a weight ratio of cyclohexane to cyclohexene of 3:7.
2 . The method according to claim 1 , wherein the frequency of the current inputted to the induction coil is regulated by a power supply and a capacitor.
3 . The method according to claim 2 , wherein the induction coil is connected to the power supply to form a circuit, and the power supply is connected in parallel with the capacitor.
4 . The method according to claim 2 , wherein the power of the power supply is 100-1,000 kW.
5 . The method according to claim 1 , wherein the induction coil is one or more of a ferrite coil, an iron core coil, a hollow coil, and a copper core coil.
6 . The method according to claim 1 , wherein the steam cracking reaction tube has an inner diameter of 50-250 mm.
7 . The method according to claim 1 , wherein the steam cracking reaction tube is made of a metal or alloy.
8 . The method according to claim 7 , wherein the metal or alloy is a metal or alloy capable of withstanding a temperature of 1,000° C.
9 . The method according to claim 7 , wherein the metal or alloy is selected from 316L stainless steel, 304S stainless steel, HK40 high-temperature furnace tube material, HP40 high-temperature furnace tube material, HP Micro Alloy micro-alloy steel or Manaurite XTM material for steam cracking furnace.