PETROLEUM PROCESSING AND PETROCHEMICALS ›› 2022, Vol. 53 ›› Issue (11): 117-122.

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PROBLEMS AND SOLUTIONS IN THE APPLICATION OF SCR DENITRIFICATION TECHNOLOGY IN FCC UNIT

  

  • Received:2022-05-26 Revised:2022-07-16 Online:2022-11-12 Published:2022-11-02
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Abstract: In order to ensure long-term operation of catalytic cracking unit, the reasons of increasing the pressure drop of the waste heat boiler in selective catalytic reduction (SCR) unit were analyzed, and the solutions were put forward. The results indicated that the formation of ammonia hydrogen sulfate (NH4HSO4) with strong viscosity and easy deposition was the main reason for the increase of pressure drop of waste heat boiler. Reducing the concentration of nitrogen oxide (NOx) and sulfur oxide (SOx) in the inlet flue gas of SCR unit could greatly reduce the amount of ammonia injected into the SCR unit and effectively inhibit the formation of NH4HSO4. The results of industrial application showed that the NOx conversion rate in the reaction-regeneration system was 69.08%-81.27%, and the concentration of NOx and SO2 in flue gas was significantly reduced after the use of SDJF-A1 type desulfurization and denitrification auxiliary agent. The methods of optimizing operation of the soot blowing system and increasing the temperature of economizer to decompose NH4HSO4 are effective in controlling the pressure drop rise in the waste heat boiler. Further measures such as optimizing SCR ammonia injection system, increasing the reaction temperature of SCR and improving soot blowing system can be taken to ensure the long-term operation of the plant.

Key words: catalytic cracking, flue gas, selective catalytic reduction, waste heat boiler, economizer, desulfurization and denitration agent