High treatment capacity feed atomizing nozzle

Abstract

The invention provides a high treatment capacity feed atomizing nozzle, and belongs to the field of petrochemical equipment. A combined cyclone, a multi-point gas injection structure and a spray-head with a porous impinging structure are adopted; and a hard alloy surfacing structure is adopted at orifices. The nozzle is suitable for feed atomizing nozzles of heavy oil FCC devices with the yield of 3,500,000-6,000,000 tons/year, the treatment capacity of a single nozzle is 60-100t/h, and a defect that the dimension of the nozzle is changed due to high treatment capacity so as to cause low atomizing effect is improved; meanwhile, the nozzle has the atomized particle size in a range of 60+/-10 mu m, the liquid layer on the injected sector surface is distributed uniformly, the yield of light oil is high, the productivity of dry gas is low, and the coking in the tubes is improved; besides, the steam consumption is low, and the gas/liquid ratio is between 3 and 6 percent (raw materials). In addition, the injecting speed of the nozzle is medium, a phenomenon that a catalyst is broken cannot occur in the production, and the nozzle has high wear resistance and the service life of more than 5 years.

Description

technical field [0001] The invention belongs to the field of petrochemical equipment, and in particular relates to a large-capacity feed steam atomization nozzle. Background technique [0002] Catalytic cracking (FCC) is an important petroleum secondary processing technology in the oil refining industry. At present, the processing capacity of FCC devices in my country is gradually developing from below 3 million tons / year in the last century to 3.5-5 million tons / year. Due to the increasing amount of raw materials that are difficult to crack, such as vacuum residue and coker wax oil, the proportion of raw materials is large (relative density reaches 0.95-0.96), the feed temperature is low, the viscosity is high, and the amount of coke is large. , Therefore, a good feed atomizing nozzle is the key equipment to increase the yield of light oil in the FCC unit, reduce the yield of dry gas and coke, and prevent the coking of the reaction system. [0003] The atomization process...

AI Technical Summary

Problems solved by technology

For some nozzles currently used in domestic FCC devices, such as KH, BWJ, CS nozzles, etc., the processing capacity of a single nozzle is mostly below 40t / h. When it exceeds 45t / h, the following problems appear: (1) The atomization particle size changes (2) The flow distribution and particle size distribution after atomization are poor

When the processing capacity of the device is further increased, because the diameter of the riser of the device is limited by the process requirements, if the number of nozzles is increased to meet the requirements of the processing capacity, it will cause that all nozzles cannot be arranged on the riser; or because the opening holes on the riser are too large Intensive, so that the strength of the riser is difficult to meet the requirements of safe production

In addition, too many nozzles will increase the number of process pipelines and valves, which will bring many difficulties to the layout of process pipelines and on-site operations.

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