Method and device for inhibiting coking of residue fluid catalytic disengager

Abstract

The invention provides a method and a device for preventing interior of a disengager from coking by quickly extracting oil gas from the fluidized catalytic cracking disengager of petroleum, wherein the device comprises a primary cyclone separator, a straight connection component which is arranged on the tail end of exit tube of the primary cyclone separator, a top cyclone separator, an oil gas drainage tube, an inertial separation component which is on the lower end of inlet of the drainage tube, a stripping section, an anti-coking steam ring and a disengager. The oil gas and the steam within the disengager are discharged out from the oil gas drainage tube only, the lower end of opening of the oil gas drainage tube is equipped with the inertial separation component so as to reduce the catalyst which is entered into the oil gas drainage tube by splashing while discharging from the dipleg of the primary cyclone separator and the dipleg of the top cyclone separator, the exit tube of the primary cyclone separator is tangentially connected to the oil gas drainage tube by means of the straight connection component, and a rotational flow is formed on the upper section of the oil gas drainage tube, so that a vortex low-pressure region is formed and the drainage draft of the oil gas is increased. The method and the device for inhibiting coking of residue fluid catalytic disengager provided by the invention have the advantages that the structure is simple and compact, the fast and efficient separation between the oil gas and the catalyst is ensured, the oil gas within the space of the disengager is extracted quickly, the retention period of the oil gas within the disengager is reduced greatly, the coking phenomenon within the disengager is inhibited effectively and therefore the operation cycle of the catalytic device is prolonged.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, relates to an oil refining and chemical process and its equipment, in particular to a method and equipment for efficiently and quickly extracting oil and gas from coking in a heavy oil catalytic cracking settler. Background technique [0002] Catalytic cracking (FCC) is the most important secondary processing process in my country's oil refining industry. Its purpose is to improve the crude oil processing depth and product quality, and increase the output of light oil. With the continuous development of catalytic cracking process and catalyst technology, catalytic cracking feed oil has been expanded to atmospheric residue and vacuum residue. The heavy oil feedstock has led to increasingly serious and common coking problems on the surface of equipment in the reaction settler system, oil and gas pipelines, fractionation tower bottoms, and oil slurry systems of heavy oil catalytic cra...

AI Technical Summary

Problems solved by technology

According to this patent scheme, although it can be realized that the stripped oil and gas at the bottom of the settler can be quickly exported to the settler, the position of the oil and gas extraction inlet of the draft tube-diffuser and the discharge outlet of the secondary cyclone separator is too close. Therefore, no matter whether the material leg of the secondary separator is wrapped in the shroud or not, the finer catalyst particles discharged from the secondary cyclone separator are likely to be sucked into the draft tube along with the oil and gas, and then enter the secondary cyclone separator. The first-stage cyclone separator increases the load of the second-stage cyclone separator, the catalyst loss, and the solid content of the oil slurry; the higher the flow rate in the draft tube and the greater the suction force, the more serious the catalyst loss

In addition, this patented solution also has defects such as poor ability to resist device fluctuations (pressure, flow, catalyst storage, etc.)

Once the material level in the stripping section rises, a large amount of catalyst is easily sucked into the draft tube, resulting in a large amount of catalyst loss

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