Nozzle device, catalytic cracking system and nozzle dredging method

Abstract

The invention relates to the field of petrochemical engineering, and discloses a nozzle device, a catalytic cracking system and a nozzle dredging method. The nozzle device comprises a nozzle (10) anda dredging mechanism (11); the dredging mechanism comprises a dredging pipe (110) communicating with the nozzle and capable of introducing a medium with pressure into the nozzle to dredge the blockednozzle, and a sealing piece sleeving the dredging pipe for sealing the dredging pipe; and the sealing piece is provided with a guide leaching port (126) for discharging the medium with pressure afterthe blockage is dredged. The nozzle device not only can dredge the blocked nozzle online to effectively dash away blockage matters, but also can effectively prevent the influence on the product quality and yield. The device is applied to the catalytic cracking system, and effectively dredges the blockage matters in the raw material nozzle. The nozzle dredging method effectively dredges the nozzle,prevents the influence on the product quality and yield, and is convenient to operate and high in repeatability.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a nozzle device, a catalytic cracking system and a nozzle dredging method. Background technique [0002] Catalytic cracking is one of the petroleum refining processes. It is a process in which heavy oil undergoes a cracking reaction under the action of heat and a catalyst, and is converted into cracked gas, gasoline and diesel oil. The settler in the catalytic cracking unit can achieve the purpose of separating oil gas and spent catalyst. Generally, catalyst rapid separation system, cyclone separator and other components are also installed in the settler. In actual use, especially at the initial stage of operation or restarting after an emergency shutdown, the feed nozzles of the catalytic cracking unit, that is, the feed nozzles installed on the settler, are often blocked, which not only directly affects the catalytic cracking The processing capacity of the device and the...

AI Technical Summary

Problems solved by technology

However, the above-mentioned solutions all have relatively large defects, and are subject to relatively large limitations, making it difficult to apply them in actual operations.

[0004] In the shutdown treatment, due to the long time of catalytic coke cleaning and shutdown maintenance, the corresponding economic loss is relatively large

Taking the 3 million tons / year catalytic cracking unit as an example, the emergency shutdown for maintenance takes about 7 days, and the loss exceeds 10 million yuan, and the shutdown process itself has a high risk of safety and environmental protection

On-line treatment is mainly used to dissolve clogging substances with solvent oil. Although this online treatment process using solvent oil to dissolve clogs does not bring huge economic losses like parking treatment, the effect is not satisfactory.

Especially when it is difficult to determine the clogging object, how to choose the appropriate type of solvent oil has become a big problem. Even if the appropriate type of solvent oil is selected, a large amount of solvent oil is required for immersion, and it will inevitably enter the device and affect the product. production rate etc.

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