Effects of ammonia co-firing on the formation of fine particles during staged gasification-combustion of coal
发布时间：2025-10-16
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- 发布时间：
- 2025-10-16
- 论文名称：
- Effects of ammonia co-firing on the formation of fine particles during staged gasification-combustion of coal
- 发表刊物：
- FUEL
- 摘要：
- This study investigated the impact of ammonia-coal co-firing on fine particulate matter (PM) formation on a staged gasification-combustion furnace. The roles of ammonia blending ratio (wNH3), gasification chamber temperature (Tg), combustion chamber temperature (Tc), and air distribution strategy (αg) were explored. The results showed that as wNH3 increases from 0 % to 40 %, fine PM follows an “increase-decrease-increase” trend, with the lowest value occurring at around 30 %. The impact of wNH3 on inorganic element volatilization is mainly influenced by ammonia’s role in promoting coal ignition, oxygen consumption during ammonia combustion, the increase in flue gas specific heat, and the reduction and volatilization of refractory elements by H2 and H2O. Increasing Tg from 1000 °C to 1300 °C significantly raises fine PM, but fine PM is reduced by 14.4 %–39.9 % at various Tg with 30 % ammonia. This is due to ammonia lowering coal combustion temperature, reducing the vaporization of refractory minerals. Ammonia also weakens the effect of Tc on char combustion, decreasing mineral element volatilization at high temperatures, leading to a 26.6 %–41.4 % reduction in fine PM. When 30 % ammonia was blended in the primary air, an αg value of 0.7 provided the best suppression of fine PM by inhibiting inorganic element volatilization. Deviations from this value significantly increased the volatilization of elements such as Mg, Ca, and Fe, as well as sulfur content in fine PM. Reducing the wNH3 and increasing Tg and Tc both reduced ammonia escape. Escaped ammonia reacted with SO3 in low-temperature zone to form ammonium sulfate salts, which were concentrated in particles smaller than 100 nm. The study shows that controlling ammonia ratio, temperature, and air distribution can significantly reduce fine PM during ammonia-coal co-firing.
- 合写作者：
- Ruan Renhui, Hua Weijian, Xu Xianlong, Zhang Kejie, Wang Dongxu, Hu Jiajia, Cui Baochong, Zhang Yixiang, Wang Guan, Su Mingxing, Wang Xuebin, Tan Houzhang, Hu Zhongfa
- 卷号：
- 399
- 是否译文：
- 否
- 发表时间：
- 2025-10-01