Ammonia desulfurization and denitrification dedusting method and device utilizing catalytic cracking regeneration flue gas

Abstract

The invention relates to an ammonia desulfurization and denitrification dedusting method and device utilizing catalytic cracking regeneration flue gas, comprising the following steps: enabling high-temperature catalyst regeneration flue gas coming from a catalytic cracking unit and containing catalyst dust to firstly enter a waste heat boiler I, reducing the temperature of the flue gas to 280-430 DEG C, wherein the heat of the flue gas is externally supplied by steam produced by the waste heat boiler I; enabling flue gas at temperature of 280-430 DEG C to enter a denitrification device for denitrification and enter a waste heat boiler II through an outlet flue after sufficiently reacting on the surface of a denitrification catalyst in a denitrification reactor; removing sulfur dioxide, nitric oxide and byproduct ammonium sulfate by taking ammonia as a reactant, and removing catalyst dust in the regeneration flue gas to achieve clean gas up-to-standard release; the three waste free release purifying method can be applied to catalytic cracking catalyst regeneration flue gas treatment in oil refining.

Description

1. Technical field [0001] The invention belongs to the field of environmental protection, and relates to a process method and a device for controlling sulfur dioxide, nitrogen oxides and dust in catalytic cracking regenerated flue gas in the petroleum refining industry. 2. Background technology [0002] Catalytic cracking is an important secondary processing in the oil refining process. It is an important means to increase the yield of light oil, produce high-octane gasoline, and produce more diesel oil at the same time. Catalytic cracking feedstock is heavy distillate oil and heavy oil (regular residue, reduced residue), which contain more non-hydrocarbons such as sulfur, nitrogen, oxygen, etc. These non-hydrocarbon elements and heavy metal elements will be transferred to products, catalysts during the production process , Industrial wastewater, some are discharged into the surrounding environment along with flue gas and catalyst dust, causing pollution. [0003] The regen...

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Problems solved by technology

The transfer catalyst technology has been developed in China for many years, and it is difficult to make the net flue gas reach the standard by using this technology alone

[0006] Catalytic cracking regenerative flue gas desulfurization methods mainly include sodium method and calcium method, which have disadvantages such as high investment, high operating cost, and waste water discharge

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