Process of alkaline catalytic cracking of inferior heavy oil with double reaction tubes in milliseconds and gaseous coupling

A process of alkaline catalytic cracking of inferior heavy oil with double reaction tubes in milliseconds and gaseous coupling, wherein the process comprising:

• 1) a high-efficiency atomizing nozzle sprays the inferior heavy oil preheated to 180° C.-350° C. from a feed inlet of a downflow reaction tube into an upper portion of the downflow reaction tube, the produced oil mist mixes with a high temperature regenerated alkaline catalyst having a temperature ranging from 700° C.-950° C. flowing downward from a dual-regulation return feeder in milliseconds, so as to heat, vaporize and crack the oil mist, the cracking reaction temperature is within a range of 530° C.-850° C.;
• a stream containing a cracked oil and gas and a coked alkali catalyst to be generated is obtained, this stream flows rapidly and downward to a rapid gas-solid separator at the bottom of the downflow reaction tube to carry out a gas-solid separation to obtain the cracked oil and gas and the coked alkali catalyst to be generated respectively;
• 2A) the cracked oil and gas enters a fractionation column to be chilled and separated, thereby obtain a column bottom oil slurry and other products including gasoline, diesel oil, liquefied gas and cracked dry gas, respectively;
• the column bottom oil slurry returns to mix with the heavy oil for recyclable use, and the other products including gasoline, diesel oil, liquefied gas and cracked dry gas are output as intermediate products;
• 2B) the coked alkali catalyst to be generated is subject to steam stripping and then passes through a flow controller and enters into a lower portion of a riser gasification reactor to mix with an oxidant and water vapor to carry out a catalytic gasification regeneration reaction at a reaction temperature of 750° C. to 1,000° C., thereby generating a material stream containing synthesis gas and regenerated alkaline catalyst, this material stream flows rapidly and upward to a gas-solid separator on the top of the riser gasification reactor to carry out a gas-solid separation to obtain a high-temperature regenerated alkaline catalyst and a synthesis gas, respectively;
• 3A) the high-temperature regenerated alkaline catalyst flows into the dual-regulation return feeder such that a portion of the high-temperature regenerated alkaline catalyst with a catalyst/oil ratio of 3-12 flows into a top of the downflow reaction tube, thereby participating in the circulation and cracking of the heavy oil in the downflow reaction tube, and the remaining portion of the high-temperature regenerated alkaline catalyst passes through a recycle tube and returns to a lower portion of the riser gasification reactor so as to continue participation in the gasification regeneration reaction;
• 3B) the synthesis gas is subject to a heat exchange and then output as a product.