Method and device for heavy oil lightening and synthesis gas production

A method for heavy oil lightening and synthesis gas production, using a cracking/gasification coupled reactor, which internally has a cracking section and a gasification section that communicate with each other, as a reactor, and comprising the following steps:

• feeding a heavy oil material into the cracking section at an upper part of the cracking/gasification coupled reactor, so as to contact with fluidized coke powders to implement a cracking reaction, to produce a light oil gas and a coke;
• the coke being carried by the coke powders and descending into the gasification section at a lower part of the cracking/gasification coupled reactor to implement a gasification reaction, to produce a synthesis gas;
• wherein the synthesis gas ascends into the cracking section, then is combined with the light oil gas, and is led out of the cracking/gasification coupled reactor to enter a gas-solid separation system;
• at least performing a first stage gas-solid separation on the light oil gas and the synthesis gas in the gas-solid separation system, collecting coke powder particles and dividing them into two parts, which return to the cracking section and the gasification section respectively, to form a first stage circulation and a second stage circulation of the coke powder particles;
• performing an oil and gas fractionation on a purified oil and gas product output by the gas-solid separation system, and collecting a light oil product and a synthesis gas product;
• the method further comprising:
• sequentially performing the first stage gas-solid separation and a second stage gas-solid separation on the light oil gas and the synthesis gas in the gas-solid separation system, so as to sequentially separate first stage coke powder particles and second stage coke powder particles, and collect a purified oil and gas product;
• returning the first stage coke powder particles to the cracking section to form the first stage circulation, and returning the second stage coke powder particles to the gasification section to form the second stage circulation;
• wherein a particle size of the first stage coke powder particles is greater than a particle size of the second stage coke powder particles;
• or,
• performing the first stage gas-solid separation on the light oil gas and the synthesis gas in the gas-solid separation system, and collecting the coke powder particles and passing them through a coke powder return distribution mechanism, then sending them back to the cracking section and the gasification section respectively by means of back blowing of a fluidizing gas, so as to form the first stage circulation and the second stage circulation.