Smoke denitration method of carbon monoxide (CO) heat recovery boiler of fluid catalytic cracking (FCC) device

Abstract

The invention provides a smoke denitration method of a carbon monoxide (CO) heat recovery boiler of a fluid catalytic cracking (FCC) device. A denitration reactor is arranged on the outside of the CO heat recovery boiler of the FCC device, a partition plate is arranged between a boiler evaporation section and a boiler coal-saving section, the inlet end and the outlet end of the denitration reactor are connected with the CO heat recovery boiler, the inlet end of the denitration reactor is communicated with the lower portion of the boiler evaporation section of the CO heat recovery boiler, the outlet end of the denitration reactor is communicated with the upper portion of the boiler coal-saving section of the CO heat recovery boiler, a circulating pipeline is communicated with an inlet and an outlet of the denitration reactor, a fan is arranged on the circulating pipeline, and smoke on the outlet of the denitration reactor is circulated to the inlet of the denitration reactor by the circulating pipeline. According to the smoke denitration method of the CO heat recovery boiler of the FCC device, blocking of catalyst caused by large piece dusts which is falling off from the CO heat recovery boiler is avoided, the service life of the catalyst is prolonged, escaped ammonia is controlled, an air pre-heater is eliminated, occupied land is saved, energy consumption is reduced, and denitration rate is guaranteed.

Description

technical field [0001] The invention relates to a treatment method for catalytic cracking (FCC) regenerated flue gas, in particular to a selective catalytic reduction (SCR) denitrification process for the treatment of regenerated flue gas of an FCC device in a refinery. Background technique [0002] Nitrogen oxides are collectively called NO x , is one of the main sources of air pollution. The most harmful are mainly: NO and NO 2 . NO x The main hazards are as follows: (1) toxic to the human body; (2) toxic to plants; (3) can form acid rain and acid fog; (4) form photochemical smog with hydrocarbons; (5) destroy the ozone layer. [0003] In refineries, in the FCC (fluid catalytic cracking) process, the catalyst particles are repeatedly circulated between the catalytic cracking zone and the catalyst regeneration zone, during regeneration, the coke from the cracking reaction on the catalyst particles is removed by air oxidation at high temperature, Removal of the coke dep...

AI Technical Summary

Problems solved by technology

Its shortcomings are as follows: it does not consider that the denitrification reactor can be closely combined with the FCC boiler, which saves the number of equipment and floor space, and alleviates the shortage of refinery land.

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