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Method and device for treating FCC regeneration flue gas

A technology for regenerating flue gas and treatment method, applied in gas treatment, gaseous discharge wastewater treatment, separation method, etc., can solve the problems of high equipment cost and high price of ozone generator, and achieve economic and environmental protection benefits. The effect of waste utilization and reduction of greenhouse gas emissions

Active Publication Date: 2020-05-05
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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  • Method and device for treating FCC regeneration flue gas

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Comparison scheme
Effect test

Embodiment 1

[0032] 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, CO 2 The concentration is 210000 mg / 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.

[0033] 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.

[0034] Cellulose algae ( Ankistrodesmus sp. ) The preparation method of SS-B7 seed liquid is as follows: adjust the pH of the ...

Embodiment 2

[0038] 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, CO 2 The concentration is 175000 mg / 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.

[0039] Divide propylene refining waste lye into two parts, one part is acidified with 98wt% sulfuric acid, and the pH of the acidification end point is controlled to be 4.5 to collect the gas generated by acidification, according to the molar ratio of hydrogen sulfide in the acidification gas to sulfur dioxide in the FCC regeneration flue gas of 1.5: 1 React, remove sulfur dioxide in flue gas, and collect desulfurized flue gas.

[0040] In the present invention, step (2) adds SS-B7 cellulosic algae seed liquid and medium into the light rea...

Embodiment 3

[0044] With embodiment 1, the difference is that the gas-liquid reactor adopts a sleeve-type internal circulation bubbling flow reactor, the control reaction pressure is 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 is controlled by pressure at the upper part of the reactor. The valve discharges, the remaining material flows downward in the ring gap, and the discharged gas-liquid mixture enters the gas-liquid separator.

[0045] After the above treatment, the removal rate of sulfur dioxide in the flue gas is 99.6%, the removal rate of nitrogen oxides reaches 99.2%, and the purified gas meets the emission requ...

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Abstract

The invention relates to a FCC regeneration flue gas treatment method which comprises the steps: (1) carrying out split-flow treatment on a waste alkali liquor, acidifying a part of the waste alkali liquor, and reacting generated gas with FCC regeneration flue gas; (2) introducing an obtained desulfurized flue gas into a cellulosic algae SS-B7 culture system in an illumination reactor, culturing for a period of time, and introducing air and / or oxygen; (3) adding solid NaOH into a rest waste alkali liquor to convert sodium hydrosulfide into sodium sulfide; (4) reacting a flue gas collected in the step (2) with the waste alkali liquor in the step (3), acidifying an obtained liquid phase in the step (1), and discharging purified gas; and (5) carrying out multiple-effect evaporation treatmenton awaste liquid collected in the step (1). According to the characteristics of propylene refining waste alkali liquid, split-flow treatment is carried out and is used for different stages of FCC regeneration flue gas treatment, SOx and NOx in the FCC regeneration flue gas can be efficiently removed, meanwhile, sulfides in the waste alkali liquid are removed, and generated sodium salt is recycled.

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): B01D53/76B01D53/50B01D53/84B01D53/56B01D53/78B01D53/40B01D53/75C02F1/00C02F103/18C02F101/10
CPCB01D53/76B01D53/50B01D53/84B01D53/56B01D53/78B01D53/40B01D53/75C02F1/00B01D2258/0283B01D2257/404C02F2103/18C02F2209/08C02F2101/101Y02A50/20
Inventor 周彤邓德刚秦丽姣
Owner CHINA PETROLEUM & CHEM CORP
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