【作者】 刘涛；

【导师】 陈雪莉；

【作者基本信息】 华东理工大学 ， 化学工艺， 2012， 硕士

【摘要】 生物质与煤共气化不仅可以弥补生物质单独气化的不足,而且对提升生物质的利用品味、丰富和完善气流床气化技术具有积极意义。本文基于生物质与煤干法气流床共气化技术,探讨了不同灰化温度下稻草、玉米秸秆、棉秆的灰熔融特性；考察了掺混不同质量分数的3种秸秆类生物质原料对青龙矿煤、刘桥一矿煤、鲍店煤和榆林煤灰熔融特性的影响；研究了掺混10%质量分数生物质对鲍店煤灰渣粘温特性的影响；比较了不同灰熔点预测模型对生物质与煤混合灰灰熔点的预测效果。研究结果表明：由于生物质含有丰富的碱金属及碱土金属而使生物质灰具有较大的熔融结渣趋势,生物质灰熔点较低,灰化温度宜取较低温度(<700℃)；虽然灰化温度对灰内钾、氯元素挥发具有显著影响,但是对灰熔点的测定结果影响较小；生物质的掺入可以显著改变不同煤种灰的熔融特性,对于高灰熔点煤表现出相似的降熔趋势,而稻草的掺入则增加了榆林煤的灰熔点；掺混10%质量分数的生物质可以改善鲍店煤灰的粘温特性,钙长石的生成是熔融灰渣降温过程中粘度突然变大的主要原因；神经网络预测模型对生物质与煤混合灰灰熔点的预测效果较优。更多还原

【Abstract】 Co-gasification of biomass and coal can not only make up the disadvantages of biomass gasification, but also produce positive meaning to promoting the grade of biomass utilization, and enriching as well as improving the entrained-flow gasification technology. Based on the entrained flow co-gasification technology of biomass and coal, the physicochemical properties of different biomass (rice straw, corn stalk and cotton straw) ashes of different ashing temperature were explored, and the ash fusion characteristics of Liuqiaoyikuang coal, Qinglongkuang coal, Baodian coal, Yulin coal with rice straw, corn stalk, cotton straw were also studied. Meanwhile, the characteristics of viscosity-temperature of blending ash at the blend ratio of 10% were also studied by high-temperature viscometer. Different models of ash fusion temperature were used to predict the blend ash fusion temperature of biomass and coal.The result shows that crop straw ashes have quite high content of alkali metals (especially potassium) and quite low fusion point (especially corn straw ash), which can easily cause the corrosion, slagging, and fouling of equipment. Although some amount of K in the form of KCl and (KC1)2 are released into the gas phase at higher ashing temperature, the fusion temperatures of three kinds of crop straw ash are not affected obviously by the different ashing temperature. It is more exact and referenced that the straw biomasses were ashed at a lower temperature (such as<700℃). The addition of 3 kinds of crop straw reduces the ash flow temperature of Liuqiaoyikuang coal and Qinglongkuang coal significantly, and the flow temperature of coal ash can be reduced to 1380℃at the blend ratio of 30%. Though the addition of rice straw increases the ash flow temperature of Yulin coal, the flow temperatures of mixtures are less than 1300℃at all blend ratios. The viscosity-temperature characteristic of Baodian coal ash was improved by the addition of crop straw, and the lowest operating temperature of gasifier can be reduced by 20℃. Due to the emergence of anorthite, the viscosity increased with decreasing the temperature of melting ash. According to the ash fusion temperature of biomass and coal blending in different proportions, the predicting flow temperature of neural network model was more exact and referenced.更多还原