碳氫燃料燃燒中的煙灰生成是重要的環境與健康議題，尤其在富燃條件下，不完全氧化更容易促進煙灰前驅物與顆粒物的生成。本研究以詳細數值模擬探討過氧化氫（H2O2)添加對預混乙烯（C2H4）/空氣火焰煙灰生成的影響，採用 ANSYS CHEMKIN-Pro 進行一維層流預混火焰計算，並使用 ABF 1 bar 化學動力學機構，涵蓋 PAHs 化學反應與基於氫抽取/乙炔加成（HACA）的表面成長機制。研究系統性變動三項參數：當量比 (ϕ)、H2O2 添加比例與 H2O2 濃度，並分析乙炔（C2H2）、PAHs（A1–A4）、火焰溫度與煙灰粒子數密度的分佈以闡明煙灰生成行為。結果顯示當量比（ϕ）為主導因子；在超富燃（ϕ ≥ 3.0）下，因氧化能力受限，PAHs 生長顯著增強，即使自由基濃度增加亦然。生成速率（ROP）分析指出，H2O2 添加可提升 OH 自由基供給，加速 C2H4 消耗並強化 C2H2 轉化，使關鍵前驅物更早生成但也更快被氧化。田口法統計分析進一步確認影響程度排序為 ϕ > H2O2 濃度 > H2O2 添加比例；在所有模擬條件中，ϕ = 2.2、H2O2 添加 50%、H2O2 濃度 100% 可得到最低粒子數密度，為最佳抑制煙灰生成的操作條件。

Soot formation in hydrocarbon combustion is a major environmental and health concern, particularly under fuel-rich conditions that favor incomplete oxidation and the growth of soot precursors. This study numerically examines the impact of hydrogen peroxide (H2O2) addition on soot formation in premixed ethylene (C2H4)/air flames using one-dimensional laminar premixed-flame simulations in ANSYS CHEMKIN-Pro with the ABF 1-bar detailed kinetic mechanism incorporating PAH chemistry and the HACA framework. The effects of equivalence ratio (ϕ), H2O2 addition level, and H2O2 concentration were systematically evaluated by analyzing profiles of C2H2, PAHs (A1–A4), temperature, and soot particle number density. Results show that ϕ is the dominant factor: ultra-rich flames (ϕ ≥ 3.0) markedly enhance PAH growth due to limited oxidation capacity, even with increased radical availability. Rate-of-production analysis indicates that H2O2 boosts OH radicals, accelerating C2H4 consumption and intensifying C2H2 turnover, which promotes earlier precursor formation but also faster oxidation of key soot-forming species. Taguchi analysis ranks parameter importance as ϕ > H2O2 concentration > H2O2 addition level, and the optimal soot-suppression condition is identified at ϕ = 2.2 with 50% H2O2 addition and 100% H2O2 concentration, yielding the lowest particle number density among all cases.

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