脱硫石油焦灰在混凝土应用中的试验研究

发布时间：2018-11-12 10:59

【摘要】：石油焦是炼油行业延迟焦化的产物，含有较高热量，有较高利用价值。循环流化床燃烧技术近年来发展较快，，脱硫效果好；随着它的广泛应用，脱硫石油焦灰产量也将大幅度提高。现阶段对脱硫石油焦灰的利用、研究较少，所以脱硫石油焦灰循环利用有很大的研究意义。脱硫石油焦灰本身含有大量钙质材料，具有良好的胶凝性能，若能为建筑行业利用，既可以节约资源，又可以减少污染，具有显著的经济效益。本文研究的脱硫石油焦灰来自青岛炼油厂，利用X射线荧光仪和X射线衍射仪分析脱硫石油焦灰的化学成分和矿物组成，并研究其对水泥标准稠度用水量、凝结时间和安定性的影响；重点研究脱硫石油焦灰对混凝土的工作性、力学性能和耐久性的影响。试验通过掺加焦灰或者预消解焦灰、粉煤灰、矿粉、以及高效减水剂，来研究脱硫石油焦灰在混凝土中的应用。具体试验方案如下：单掺焦灰或者预消解焦灰，复掺矿粉和焦灰或者预消解焦灰，复掺粉煤灰和焦灰或者预消解焦灰；其中焦灰或者预消解焦灰的掺量依次为0%、5%、10%、15%、20%，矿粉或者粉煤灰的掺量依次为50%、45%、40%、35%、30%；胶凝材料用量分别为350kg/m~3、390kg/m~3、430kg/m~3、470kg/m~3。研究表明：合理的利用脱硫石油焦灰可显著降低水泥用量；掺入预消解焦灰比掺入原状焦灰对混凝土的各项性能更为有利；当焦灰掺量、胶凝材料总量相同时，复掺焦灰和S95矿粉的力学性能、抗碳化性能和抗氯离子渗透性能都是最佳的；单掺焦灰的抗氯离子渗透的能力最差，复掺粉煤灰和焦灰的力学性能和抗碳化性能最差。试验研究表明：脱硫石油焦灰掺入混凝土的最优配比为复掺15%预消解焦灰和35%矿粉。
[Abstract]:Petroleum coke is the product of delayed coking in oil refining industry. Circulating fluidized bed (CFB) combustion technology has been developed rapidly in recent years with good desulphurization effect and with its wide application the production of desulphurized petroleum coke ash will be greatly increased. There are few researches on the utilization of desulfurized petroleum coke ash at present, so it is of great significance to study the recycle utilization of desulphurized petroleum coke ash. Desulphurized petroleum coke ash itself contains a large number of calcium materials and has good gelation performance. If it can be used in the construction industry, it can save resources and reduce pollution, and has remarkable economic benefits. The desulphurized petroleum coke ash studied in this paper comes from Qingdao Refinery. The chemical composition and mineral composition of desulphurized petroleum coke ash are analyzed by X-ray fluorescence and X-ray diffractometer, and the water consumption for cement standard consistency is studied. The influence of setting time and stability; The influence of desulphurized petroleum coke ash on the workability, mechanical properties and durability of concrete was studied. The application of desulphurized petroleum coke ash in concrete was studied by adding coke ash, fly ash, mineral powder and high efficiency water reducing agent. The specific test schemes are as follows: single coking ash or predigested coke ash, mixed mineral powder and coke ash or predigested coke ash, mixed fly ash and coke ash or predigested coke ash; Among them, the content of coke ash or pre-digestion coke ash is 0, 5, 10, 10, 10, 10, 10, and 20, and the amount of mineral powder or fly ash, in turn, is 50, 45, 45, 40, and 35, 35, 30, respectively. The amount of cementitious material was 350 kg / m, 3390 kg / m, 3430 kg / m and 3470 kg / m, respectively. The results show that the dosage of cement can be significantly reduced by using desulphurized petroleum coke ash reasonably, and the properties of concrete are more favorable by adding pre-decomposed coke ash than by adding undisturbed coke ash. When the content of coke ash and the total amount of cementitious material are the same, the mechanical properties, carbonation resistance and chloride ion penetration resistance of coking ash and S95 mineral powder are the best. The mechanical properties and carbonation resistance of fly ash and coke ash were the worst. The experimental results show that the optimum mix ratio of desulphurized petroleum coke ash and concrete is 15% predigested coke ash and 35% ore powder.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528

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