Work

Numerical simulation and multi-objective optimization of ultra-low nitrogen burners for ethylene cracking furnaces

Year: 2025

Type: article

Abstract: Coupled numerical simulation and multi-objective optimization for ultra-low nitrogen burners of ethylene cracking furnaces using a fast response surrogate model for combustion are proposed. Firstly, based on simplified reaction mechanisms involving 29 species and 164 reactions, a computational fluid dynamics (CFD)-coupled model for turbulent combustion is established. Secondly, a multi-objective optimization scheme based on a strong generalization-based surrogate model is developed for ultra-low nitrogen burners of ethylene cracking furnaces. The results show that a set of optimal operating parameters for the cracking furnace, i.e., the excess air coefficient of 1.07, the fuel gas flow rate of 0.192 kg/s, and the air preheating temperature of 380 K, is obtained. The optimal NOx emission concentration decreased from 75.38 mg/m3 of the original scheme to 71.2 mg/m3, i.e., a decrease of 5.55%. The thermal efficiency of the firebox increased from 43.82% of the original scheme to 44.49%, i.e., an increase of 1.53%, which provides theoretical guidance for energy conservation and emission reduction of cracking furnaces.

Source: Environment Protection Engineering

DOI: 10.37190/epe250103

Authors: Hu Guihua, Chen Kunpeng, Chen Mimi

Language: English

Topic: Combustion and flame dynamics

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

SDGs: Climate action, Affordable and clean energy

Open Access status: bronze

Funders: National Natural Science Foundation of China, Fundamental Research Funds for the Central Universities

Awards: G5594624436, G5789780205, G7843069097