Li Zhaobin, Fan Tang Wai, Lun Mak Shu, Li Qingwen
Department of Construction and Quality Management, School of Science and Technology, Hong Kong Metropolitan University, Homantin Kowloon, Hong Kong, SAR 999077, China.
Sci Rep. 2024 Aug 20;14(1):19309. doi: 10.1038/s41598-024-69019-w.
With urbanization, municipal solid waste (MSW) generation is increasing. Traditional landfill methods face land shortages and environmental pollution. Waste incineration, which reduces waste and recovers resources, has become a key management method. However, nitrogen oxides (NO) produced during incineration severely impact the environment, requiring improved control technologies. This study optimized three denitrification technologies-air staging, flue gas recirculation (FGR), and selective non-catalytic reduction (SNCR)-using numerical simulations. The research provides support for improving waste incinerator efficiency and stability while reducing NOx emissions, aiding the sustainable development of waste incineration technology. By optimizing the primary and secondary air distribution ratios, the initial NOx generation was reduced by 8.39%. When 20% of the recirculated flue gas was introduced as secondary air, NOx generation was reduced by 23.54%, and boiler efficiency increased to 83.78%. The study examined the impact of different sludge mixing ratios on the temperature and NOx emissions within the context of municipal solid waste (MSW) incineration. Initially, the study aimed to address the environmental concerns of NOx emissions during the incineration process by exploring how the introduction of sludge at various mixing ratios would affect combustion parameters. The results showed that a sludge mixing ratio between 3 and 13% optimized the combustion process with 7% being the most effective in balancing temperature control and NOx emissions. Specifically, the best value of the sludge mixing ratio refers to achieving an optimal reduction in NOx emissions while maintaining stable incinerator operation. The chemical compositions of the sludge included key elements such as carbon (C), hydrogen (H), nitrogen (N), sulfur (S), and oxygen (O), with approximate proportions of C: 31.2%, H: 4.7%, N: 2.5%, S: 0.6%, and O: 31.8%.
随着城市化进程的推进，城市生活垃圾（MSW）的产生量不断增加。传统的填埋方法面临土地短缺和环境污染问题。垃圾焚烧能够减少垃圾量并回收资源，已成为一种关键的管理方法。然而，焚烧过程中产生的氮氧化物（NO）对环境造成严重影响，需要改进控制技术。本研究通过数值模拟对三种脱硝技术——空气分级、烟气再循环（FGR）和选择性非催化还原（SNCR）进行了优化。该研究为提高垃圾焚烧炉的效率和稳定性、减少氮氧化物排放提供了支持，有助于垃圾焚烧技术的可持续发展。通过优化一次风和二次风的分配比例，初始氮氧化物生成量降低了8.39%。当引入20%的再循环烟气作为二次风时，氮氧化物生成量降低了23.54%，锅炉效率提高到83.78%。该研究考察了不同污泥混合比例对城市生活垃圾（MSW）焚烧过程中温度和氮氧化物排放的影响。最初，该研究旨在通过探索不同混合比例的污泥引入如何影响燃烧参数，来解决焚烧过程中氮氧化物排放的环境问题。结果表明，污泥混合比例在3%至13%之间可优化燃烧过程，其中7%最为有效地平衡了温度控制和氮氧化物排放。具体而言，污泥混合比例的最佳值是指在保持焚烧炉稳定运行的同时，实现氮氧化物排放的最优减少。污泥的化学成分包括碳（C）、氢（H）、氮（N）、硫（S）和氧（O）等关键元素，其近似比例为C：31.2%，H：4.7%，N：2.5%，S：0.6%，O：31.8%。
