Catalytic crackingflue gas dust removal, desulfurization and sodium sulfite recovery process

Abstract

The invention discloses a catalytic crackingflue gas dust removal, desulfurization and sodium sulfite recovery process which adopts a dust removal system, a desulfurization system and a sodium sulfiterecovery system. The dust removal system is a bag type dust collector 1. The desulfurization system is a desulfurization tower 3, the desulfurization tower 3 comprises a spraying layer 4, a demister5 and a chimney 6 are arranged above the spraying layer 4. The bag type dust collector 1 is connected with the desulfurization tower 3 through a booster fan 2. The sodium sulfite recovery system comprises a crystallizer 7, a thickening device 8 and a centrifugal machine 10, wherein the thickening device 8 is arranged before the centrifugal machine 10, the crystallizer 7, the thickening device 8 and the centrifugal machine 10 are sequentially connected through pipes, and a fluidized-bed dryer 11 and a cyclone separator 12 are sequentially connected behind the centrifugal machine 10. The thickening device 8 is also connected with an overflow buffer tank 9, and the overflow buffer tank 9 is also connected with the desulfurization tower 3. The process is high in sodium sulfite recovery rate while meeting current environmental protection standard, obtained products are high in purity, almost no wastewater is discharged, and the catalytic crackingflue gas dust removal, desulfurization and sodium sulfite recovery process has the advantages of being low in operation cost, obvious in economic and environmental benefit and the like.

Description

technical field [0001] The invention belongs to the technical field of pollution prevention and control of catalytic regeneration flue gas in the petroleum refining industry, and in particular relates to a system and method for recovering sodium sulfite from dust removal and desulfurization of catalytic cracking flue gas. Background technique [0002] Catalytic cracking is the main means of lightening heavy oil in the petroleum refining industry, and plays a very important role in the petroleum refining industry, but it is also the main source of emissions of dust, sulfide and other pollutants in the refining industry. With the rapid development of my country's economy, the demand for light oil is increasing day by day, which makes the oil processing volume of my country's oil refining industry increase day by day. At the same time, due to the gradual increase in the use of heavy crude oil with high sulfur content, the amount of sulfur oxides and dust emitted by catalytic cr...

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Problems solved by technology

[0008] Aiming at the problems of high operating cost of the current catalytic cracking regenerated flue gas dust removal and desulfurization treatment process, low resource utilization rate caused by direct discharge of desulfurization wastewater after treatment, and economical efficiency of wastewater treatment, the present invention proposes a catalytic cracking flue gas dust removal and desulfurization recovery sodium sulfite system and method, while achieving zero discharge of wastewater, it also increases the economic benefits of the system

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