Method for dedusting and desulfurizing catalytic-cracking oil refining regenerated flue gas

A technology for regenerating flue gas and catalytic cracking, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of large energy loss, high flue gas resistance, and high water consumption.

Active Publication Date: 2013-08-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some outstanding problems in the operation of the EDV wet scrubbing system, such as the high resistance of the flue gas, resulting in a large energy loss
In addition, the one

Method used

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  • Method for dedusting and desulfurizing catalytic-cracking oil refining regenerated flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 200 g of light-burned magnesium oxide powder, add 5 L of warm water at 40° C. for aging, and convert it into a magnesium hydroxide slurry with a mass concentration of 5.5%. Mix the remaining 140 g of 30% sodium hydroxide solution, dilute it with water to 10 L, and stir well to prepare 2 sodium-magnesium composite desulfurization solutions containing 2.9% magnesium hydroxide concentration and 0.4% sodium hydroxide concentration, wherein Na / Mg is 0.2.

[0028] Put the desulfurization slurry into the desulfurization tower for spray absorption desulfurization, the simulated flue gas flow rate is 20m 3 / h. Liquid to gas ratio 1L / m 3 , The desulfurization tower has a diameter of 150mm and a height of 1000mm. The desulfurization slurry is sprayed down from the top of the tower and contacts the simulated flue gas in the reverse direction. The flue gas passes through a desulfurization and dust removal strengthening unit. reaction, the desulfurization slurry absorbs su...

Embodiment 2

[0031] Weigh 12Kg of light-burned magnesium oxide powder, dissolve 0.6Kg of sodium alkali in 300L of water, stir well, and configure a desulfurization slurry with a magnesium hydroxide concentration of about 5%, wherein Na / Mg is 0.05. Put the desulfurization slurry into the desulfurization tower for spray absorption desulfurization. The simulated flue gas flow rate is 2000m 3 / h, the dust content in the simulated flue gas is 180mg / m 3 , sulfur dioxide is 800mg / m 3 . Under this condition, the liquid-gas ratio is 2L / m 3 , The desulfurization tower has a diameter of 480mm and a height of 3000mm. The desulfurization slurry is sprayed down from the top of the tower and contacts with the flue gas in the reverse direction. The flue gas passes through the desulfurization and dust removal strengthening unit. The desulfurization slurry absorbs sulfur oxides and particulate matter in the flue gas. The desulfurization efficiency is 97%, and the dust removal efficiency is 96%.

[00...

Embodiment 3

[0034] The actual small-scale FCC regeneration furnace is used for the test, and the flue gas volume is 10000m3 3 / h. The dust content in the flue gas is 120mg / m 3 , sulfur dioxide is 900mg / m 3 , nitrogen oxide content 300mg / m 3 , at the flue gas inlet, through the sampling generator, after calculation, add ozone gas with a concentration of 300ppm.

[0035] Magnesium hydroxide and sodium hydroxide are dissolved in water respectively to form magnesium hydroxide and sodium hydroxide slurries, and the desulfurization slurry obtained after mixing by a slurry pump has a magnesium hydroxide concentration of 5%, and Na / Mg is 0.1. Put the desulfurization slurry into the desulfurization tower for spray absorption desulfurization. Liquid to gas ratio 3L / m 3 , The desulfurization tower has a diameter of 1000mm and a height of 10000mm. The desulfurization slurry is sprayed down from the top of the tower and contacts with the flue gas in the reverse direction. The flue gas passes thr...

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Abstract

The invention relates to a method for dedusting and desulfurizing catalytic-cracking oil refining regenerated flue gas. The method which utilizes a sodium alkali and magnesia combined sodium-magnesium method comprises the following steps: magnesium hydroxide slurry is prepared from magnesia firstly and is mixed with a sodium alkali solution according to a certain ratio so as to prepare a desulfurization solution, and the desulfurization solution is conveyed to each spraying layer from the bottom of a tower by a desulfurization circulating pump; the flue gas is subjected to spraying, humidifying and cooling at an entrance of a desulfurization tower, then rises from the bottom of the desulfurization tower and is subjected to enhanced dedusting, desulfurizing and acid mist trapping by a combination unit, and the flue gas flowing out of the combination unit is then subjected to deep desulfurizing and dedusting by an upper spraying zone; sulfur dioxide in the flue gas is converted into magnesium sulfite and sodium sulfite; desulfurizing waste liquid is subjected to adequate aeration and oxidation, and then, produced magnesium sulfate and waste residues are discharged by a residue slurry pump and enter a subsequent filtration and dewatering system; and slurry concentrated by a cyclone is subjected to dewatering by a filtering machine so as to obtain disposable solid wastes. Compared with the prior art, the method has the advantages that the cost of the desulfurizing liquid can be remarkably reduced, the wastewater output is reduced, and meanwhile, the dedusting and desulfurization of FCC (Fluidized catalytic cracking) regenerated flue gas can be realized efficiently.

Description

technical field [0001] The invention relates to a high-efficiency desulfurization and dust removal method, in particular to a method for dust removal and desulfurization of regenerated flue gas from catalytic cracking refinery (FCC). Background technique [0002] Fluid Catalytic Cracking (FCC) process is an essential process for deep processing of poor quality heavy oil. In the FCC regenerator, about 90% of the sulfur on the coke is converted to sulfur dioxide, and the rest exists in the form of sulfur trioxide. If no sulfur transfer agent is added to the cracking catalyst, almost all the sulfur oxides in the regeneration process will enter the flue gas and be discharged with the flue gas. It is reported that before 2001, the content of SOx in the FCC regeneration flue gas of some refineries in my country was around 800ppm. With the increase of raw material sulfur content, SOx content in FCC regeneration flue gas continues to increase. At present, it is conservatively est...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50B01D47/06
Inventor 晏乃强瞿赞陈万苗黄文君赵松建
Owner SHANGHAI JIAO TONG UNIV
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