To reduce fossil fuel consumption, blending sludge pyrolysis gas and ammonia (NH3) for combustion enables the energy utilization of sludge pyrolysis gas while improving combustion characteristics of NH3. This study employs chemiluminescence to investigate the structure of sludge pyrolysis gas/ammonia/air flame for the first time. A thorough investigation was conducted into the impacts of various swirl structure parameters on the stable combustion range and pollutant emissions. To further reduce pollutant emissions, staged combustion was used, and the effects of ammonia doping ratio, secondary air equivalence ratio, and secondary air inlet height on pollutant emissions were analyzed. The findings demonstrate that increasing the ammonia ratio narrows stable combustion equivalence ratio range. Additionally, at a thermal power of 5 kW, stable combustion was observed in the equivalence ratio range of 0.41-1.70, an improvement of 95.5%. Notably, staged combustion significantly reduced NO emissions, achieving concentrations as low as 32.7 ppm under stoichiometric conditions, compared to 1912.6 ppm in non-staged pure NH3 combustion. This study provides valuable insights into the stability and emission characteristics of sludge pyrolysis gas/ammonia swirl burners for efficient and cleaner low-carbon fuels utilization.
水泥窑纯低温余热发电站利用水泥生产过程中产生的废热进行发电,其膨胀做功后的乏汽主要通过水冷和空冷系统进行冷凝,两种冷凝方式在造价、占地、换热效率和节能等方面各有优劣势.针对上述两种冷凝方法的特点,结合福建龙岩地区水泥厂余热发电机组实际运行情况以及当地的气候特点,提出采用蒸发式冷凝技术替代传统的水冷和空冷系统,可节约水资源17.1%,节电27.5%,每年可减少CO2排放量691.2 t.
在全球碳中和背景下,热泵蒸汽(SGHP)技术得到广泛关注和快速发展.对SGHP系统的两种热力循环分别开展㶲效率和热力性能分析,研究其在工业蒸汽供应方面替代燃气锅炉(Gas-B)、燃煤锅炉(Coal-B)的节能减碳效果.结果表明:直接蒸发式热泵蒸汽系统(DE-SGHP)具有更好的热力性能,其系统性能系数(COP)相比闪蒸循环式热泵蒸汽系统(CF-SGHP)提高了8.8%;采用SGHP系统供应蒸汽的节能性及热泵系统COP与城市气电比、煤电比密切相关,气电比、煤电比越大,SGHP系统供汽节能效果越好,在中国大部分地区采用SGHP供汽相比Gas-B均具有显著的节能效果,但是相比Coal-B系统只有在华南和华东地区具有一定的节能性;在减少CO2排放方面,采用SGHP系统供汽比锅炉系统具有更好的效果.
以废弃酒糟细渣为原料、KOH为活化剂制备具有优异电化学性能的蜂窝状结构的O、N双掺杂多孔碳.研究结果表明,当酒糟细渣与KOH的质量比为 1∶3,热解温度为 700℃时,制备的电极材料VPH-3-700 性能最佳.电化学测试表明,VPH-3-700在0.2 A/g的电流密度下电化学比电容可达343.68 F/g,具有应用于高性能超级电容器的潜力.较高的比电容主要得益于样品的高比表面积(2396 m2/g)以及具有电化学活性的杂原子官能团带来的赝电容.该研究内容为废弃酒糟的资源化利用提供新的思路.
随着东莞市工业经济建设的快速发展和政府的大力扶持,东莞市电子产品制造、交通运输、电力生产以及石油化工、塑料加工等企业数量快速增多,危险废物种类和数量也均显著增加.分析了东莞市HW06/08/17三类危险废物产出的区域分布和产出行业特点,通过 GIS 系统对东莞市危险废物产出区域上的动态变化探索发现,HW06/08/17 三类危险废物产出区域均有逐渐集中的趋势,表现在各产出单位逐步向交通和发展条件较好的片区边缘地区聚集.最后,简要分析危险废物处理处置现状并提出合理的管理策略和建议,为相关部门危险废物管理提供参考.
