Catalytic cracking method for processing heavy oil, and apparatus thereof

Abstract

The invention relates to a catalytic cracking method for processing heavy oil, and an apparatus thereof. The apparatus comprises a primary riser reactor, an auxiliary riser reactor, a gas-solid separation system and a regeneration device, the upper portion of the auxiliary riser is communicated with the middle and upper portion of the primary riser, the central axes of the primary riser and the auxiliary riser are not in a same plane, and a distance between the central axes of the primary riser and the auxiliary riser is greater than zero and less than the radius of the primary riser. An auxiliary riser oil gas agent undergoes simple cyclone separation when the oil gas agent enters the primary riser, an oil gas enters a settlement device from the upper portion of the primary riser, and a catalyst descends along the inner wall of the primary riser and is mixed with a catalyst which has reacted with a poor-quality raw material in the primary riser, thereby the catalyst which has reacted with the high-quality raw material and the catalyst which has reacted with the poor-quality raw material are fully mixed. The high temperature and the high activity of the former catalyst are utilized to make the oil gas carried by the latter catalyst fully react, so the light oil yield is improved by 2.0%, the liquid yield is improved by 2.5%, and the dry gas and coke yields are reduced by 2.2% respectively.

Description

technical field [0001] The invention relates to a catalytic device and application of petroleum hydrocarbons under non-hydrogen-facing conditions, more specifically, a riser catalytic cracking device for processing low-quality heavy oil and its application. Background technique [0002] It is generally believed that in the process of catalytic cracking reaction, the breakage of chemical bonds mainly occurs in chain hydrocarbons and cycloalkanes, benzene ring side chains, and bridges connecting ring structures, and the larger the molecule of the reactant, the easier the cracking reaction occurs . Therefore, the reaction time required for heavy oil cracking should be less than for distillate catalytic cracking. This point of view is widely accepted, thereby successfully developed various oil agent fast separation technologies and millisecond catalytic reaction technologies, and is also committed to the development and research of downtube reactors (as disclosed in USP4797262,...

AI Technical Summary

Problems solved by technology

There are great differences in the reaction performance of the two, the adsorption capacity for the active sites of the catalyst, and the coke formation performance. There must be vicious competition when they coexist in the same reaction system.

The existing technology mixes the oil-air agent rising from the main and auxiliary risers relatively well, but there is still room for improvement, especially the existing technology mixes two streams of oil-air agent together instead of focusing on mixing related catalysts in a differentiated way

Images