Abstract:

The old ethylene plant of PetroChina Dushanzi Petrochemical Company adopts the technology of Lummus (USA). It was designed and constructed by SNAM (UK) with a design capacity of 140 kt/a. In the transformation in 2002, it was expanded from 5 cracking furnaces to 7 cracking furnaces, and its capacity reached 220 kt/a. In 2017, the adjusted nitrogen oxide content in the flue gas of cracking furnace could meet the national standard (< 180 mg/m3), but fluctuated around 170 mg/m3, resulting in low operating flexibility of cracking furnace, so the demand of high load production could not be met. In order to reduce the nitrogen oxide content in the flue gas of cracking furnace and improve the operating flexibility of cracking furnace, the burners of the seven cracking furnaces in the old ethylene plant in Dushanzi were revamped for low nitrogen content. After the transformation, the nitrogen oxide content is required to be less than 100 mg/m³ as stipulated in the new national standard.

Key words: NOx')">

NOx, adjustment, transformation, reduction