A Novel Fluidized Bed Coupling Reactor and System

Abstract

The invention discloses a novel fluidized bed coupling reactor and system. The reactor comprises a reactor shell and is characterized in that a post-reaction system, a multistage cyclone distributionsystem, a coking-preventing feeding system and a steam stripping system are sequentially arranged in the shell from top to bottom; the post-reaction system is used for separating particles and an oilgas product and guiding the oil gas product out of the reactor; the multistage cyclone distribution system comprises a cyclone head connected with a particle inlet pipe; the coking-preventing feedingsystem comprises a plurality layers of atomizing nozzles and a plurality of conical guide retaining plates, the atomizing nozzles are fixed to a reactor shell, the outlet ends of the atomizing nozzlesare arranged in the reactor shell, and the atomizing nozzles and the conical guide retaining plates are arranged at intervals; the steam stripping system is used for replacing the oil gas product carried in the particles. The reactor has the advantages that uniform feeding particle distribution and fast feeding area particle renewing are guaranteed effectively, feeding area coke generation is prevented, and the reactor is especially applicable to reaction processes introducing easy-to-coke heavy raw materials such as fluid coking and flexible coking raw materials into a dense-phase fluidizedbed through the nozzles.

Description

technical field [0001] The invention relates to a novel fluidized bed coupled reactor and system, belonging to the fields of petroleum refining and petrochemical industry. Background technique [0002] Fluidization technology has the advantages of high heat and mass transfer efficiency, uniform bed temperature, high heat transfer coefficient with the tube wall, solids can be transported in large quantities like fluids, etc., and has been widely used in chemical and petrochemical industries. With the gradual development of process technology, it is difficult for a single type of fluidized bed reactor to meet the needs of some new processes. In recent years, people have begun to couple different types of fluidized beds to meet the special requirements of the process. [0003] Chinese patent application ZL93219972.0 discloses a catalytic cracking down-flow reaction device. A multi-tubular fluidized bed mixing and distribution device is installed on the top of the down-bed reac...

AI Technical Summary

Problems solved by technology

This structure has the following disadvantages: (1) Since the coking raw oil is heavy and difficult to gasify, and the number of nozzles is relatively small, and the concentration of coke powder in the riser is low, the coking raw oil cannot be completely gasified, resulting in Reaction yield decreased

(2) The second reaction zone needs a large amount of fluidizing medium to fluidize the bed, which will greatly increase the energy consumption of the device; (3) The second reaction zone and the stripper are connected by pipelines, which increases the oil and gas The residence time in the pipe can easily cause coking in the pipeline

When the pressure in the settler changes suddenly, there should be a space buffer to ensure that the pressure does not fluctuate violently. Therefore, part of the oil and gas should be allowed to enter the space above the enclosure. When the operation is normal, this part of the oil and gas should be sucked to the inlet of the gas-solid separation equipment. Existing devices all can not reach above-mentioned effect

[0009] (2) Thermal coke particle distribution problem

The current device only adopts an open method or a perforated plate, which is obviously difficult to evenly distribute the coke powder particles

[0011] (3) Wet material and agglomeration in the jet area

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