Treatment method and treatment device for FCC regeneration flue gas

A technology for regenerating flue gas and treatment methods, applied in the direction of gaseous effluent wastewater treatment, separation methods, chemical instruments and methods, etc., can solve the problems of high equipment costs, expensive ozone generators, etc., and achieve the effect of waste utilization

Active Publication Date: 2019-06-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of the ozone generator, the equipment cost is relatively high

Method used

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  • Treatment method and treatment device for FCC regeneration flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Adopt the present invention to attach figure 1 In the process shown, the FCC regeneration flue gas is treated with propylene refining waste lye. In flue gas, SO 2 Concentration is 2970mg / m³, NO concentration is 2320 mg / m³, NO 2 The concentration is 530mg / m³. The water quality of propylene refining waste lye is: 6.83wt% sodium sulfide, 4.85wt% sodium hydrosulfide, 117300mg / L COD, and 13.5 pH.

[0031] Divide propylene refining waste lye into two parts, one part is acidified with 98wt% sulfuric acid, the pH at the end of acidification is controlled to be 4.0, the gas generated by acidification is collected, and the molar ratio of hydrogen sulfide in acidification gas to sulfur dioxide in FCC regeneration flue gas is 2 :1 to react, remove sulfur dioxide in flue gas, and collect desulfurized flue gas. According to the molar ratio of NO and air in the desulfurization flue gas of 1:15, the air is passed to oxidize NO to NO 2 . Add solid sodium hydroxide to the remaining...

Embodiment 2

[0034] Adopt the present invention to attach figure 1 In the process shown, the FCC regeneration flue gas is treated with propylene refining waste lye. In flue gas, SO 2 Concentration is 2120mg / m³, NO concentration is 1370mg / m³, NO 2 The concentration is 420mg / m³. The water quality of propylene refining waste lye is: 4.8wt% sodium sulfide, 3.4wt% sodium hydrosulfide, 82400mg / L COD, and 13.8 pH.

[0035] Divide propylene refining waste lye into two parts, one part is acidified with 98wt% sulfuric acid, the pH at the end of acidification is controlled to be 4.5, the gas produced by acidification is collected, and the molar ratio of hydrogen sulfide in acidification gas to sulfur dioxide in FCC regeneration flue gas is 1.5 :1 to react, remove sulfur dioxide in flue gas, and collect desulfurized flue gas. According to the molar ratio of NO and air in the desulfurization flue gas of 1:10, the air is passed to oxidize NO to NO 2 . Add solid sodium hydroxide to the remaining wa...

Embodiment 3

[0038] Same as Example 1, the difference is that the gas-liquid reactor adopts a sleeve-type internal circulation bubbling flow reactor, the reaction pressure is controlled at 0.3MPa, and the waste caustic is fed intermittently, and enters the annulus between the inner and outer cylinders from the upper part of the reactor , the regenerated flue gas is continuously fed, and enters the inner cylinder from the bottom of the reactor. Using the lifting effect of the flue gas, the gas-liquid mixture reacts while flowing upward in the inner cylinder of the reactor, and a part of the mixed material passes through the pressure on the upper part of the reactor. The control valve discharges, the remaining material flows downward in the ring gap, and the discharged gas-liquid mixture enters the gas-liquid separator.

[0039] After the above treatment, the removal rate of sulfur dioxide in the flue gas is 99.5%, the removal rate of nitrogen oxides reaches 99.1%, and the purified gas meets ...

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Abstract

The invention relates to a treatment method and a treatment device for FCC regeneration flue gas. The treatment method comprises the following steps: carrying out split-flow treatment on propylene refining waste alkali liquor, acidifying part of the propylene refining waste alkali liquor in an acidifying treater, and carrying out a reaction on the acidified gas and the FCC regeneration flue gas ina desulfuration reactor to recover generated single element sulfur; adding solid sodium hydroxide into the residual propylene refining waste alkali liquor, wherein sodium bisulfide in the waste alkali liquor is fully converted into sodium sulfate, oxidizing NO in the desulfurated flue gas into NO2 to react with the waste alkali liquor, a liquid phase enters the acidifying treater and purified gasis discharged; and carrying out multiple-effect evaporation on the acidified waste liquor to recover sodium salt. The treatment method can remove SOx and NOx in the FCC regeneration flue gas effectively and remove sulfides in the waste alkali liquor simultaneously to recover the generated sodium salt. The treatment device treats wastes with wastes, so that the treatment device is economical and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of environmental protection waste gas treatment, and in particular relates to a treatment method and device for FCC regenerated flue gas. Background technique [0002] Catalytic cracking (FCC), as the main production device of petroleum refining enterprises, plays a very important role in petroleum processing. It is the main production device for lightening heavy oil and obtaining light fuel oil. However, part of the sulfur and nitrogen in the raw materials are converted into SOx, NOx and other harmful substances, which are discharged into the atmosphere with the FCC regeneration flue gas, causing environmental pollution and have become the most important source of pollution in refineries. The regenerated flue gas of the catalytic cracking unit must go through desulfurization, denitrification and dust removal to meet the environmental protection emission standards. [0003] Catalytic cracking flue gas desul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/50B01D53/56B01D53/76B01D53/78C01B17/04C01D5/00C02F1/04C02F9/10C02F1/08C02F103/18
CPCY02P20/584
Inventor 周彤邓德刚秦丽姣
Owner CHINA PETROLEUM & CHEM CORP
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