掺混污泥对水煤浆性能的影响

Effect of sewage sludge addition on coal water slurry properties

将两种高含水率的脱水污泥与兖州煤掺混,采用湿法球磨工艺制备污泥水煤浆。考察污泥的添加对磨矿效率的影响,研究不同比例污泥掺混水煤浆后,浆体的成浆性、燃烧热值及灰熔融性变化,并通过粒径分布、表面形貌、灰成分等分析了原因。结果表明:水煤浆掺混污泥湿法球磨时,能提高磨矿效率;污泥水煤浆呈现更强的假塑特性,污泥的添加可以提高水煤浆的稳定性;污泥水煤浆的燃烧热能满足燃烧需求。当两种污泥的添加比例为10%时,水煤浆的成浆浓度达到60%以上,且各性能均满足工业要求。

Blend two kinds of high-moisture dewatered sludge with Yanzhou coal to prepare coal-sludge slurry by wet milling process. Investigate the influence of sludge addition on wet milling grinding efficiency. By changing additive amount of sludge, analyse the slurryability, combustion enthalpy and ash fusion temperatures of prepared coal water slurry. Analyse the reasons from the aspects of particle size distribution, surface morphology and ash com- position etcetera. The results show that, the addition of dewatered sludge can improve the grinding efficiency and stability of coal-sludge slurry in the wet milling process. The coal-sludge slurry present better pseudoplastic characteristic. The combustion enthalpy of sludge coal-water slurry value is slightly lower than that of coal-water slurry, but still meet the requirement of combustion. The suitable sludge blending ratio is 10 percent, when the slurry concentration of coal-sludge slurry can reach up to 60 percent, and all properties can meet industrial requirements.