Regulation of high temperature flow properties of ash containing V and Ni
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摘要: 以三种含V和Ni灰为研究对象,探索通过添加助剂和配煤两种途径来调控含V和Ni灰的流动性,利用XRD、SEM-EDX和三元相图等分析方法,探究了两种方法调控含V和Ni灰流动性的机理。结果表明,灰中V和Ni在高温下形成难熔物钒氧矿和单质镍,配煤和添加CaO降低了V和Ni的含量,同时可降低除V和Ni以外灰组成的液相温度,进而降低灰的熔融温度。当灰中V和Ni的总含量低于30%时,配入助熔剂CaO可明显降低灰的熔融温度,但其黏温曲线转变为结晶渣类型。当灰中V和Ni含量高于30%时,需通过配入低熔点煤灰降低熔融温度,在满足气流床排渣要求的煤灰中配入5%的该灰后,其黏温特性仍满足气流床液态排渣的要求,但配比达到10%时,降温过程中析出大量的富钒尖晶石,使灰渣黏温曲线转变为结晶渣类型,其不再适合气流床液态排渣的要求。Abstract: Three ashes containing V and Ni were preparation for the study. CaO addition and coal ash blending were chosen for regulation of high temperature flow properties. The regulation mechanism was explored by XRD, SEM-EDX and ternary phase diagram analysis. The results show that karelianite and Ni are main refractory matters in petroleum coke ash at high temperature. CaO addition and coal ash blending decrease the liquid temperatures of ash components except V and Ni, which reduces the ash fusion temperatures. When the contents of V and Ni are fewer than 30% in ash, CaO can obviously decrease the fusion temperature of ash, and the viscosity-temperature property becomes crystal type. When the contents of V and Ni are higher than 30% in ash, coal ash blending is an effective method to decrease the fusion temperature. In this condition, 5% of coal ash blending ratio is required, and its viscosity-temperature property is suitable for slag tapping, but when the coal ash proportion is 10% the viscosity-temperature property of ash becomes crystal type for the precipitation of vanadium-rich spinel, which cannot meet the requirement of slag tapping.
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Key words:
- ash /
- fusion property /
- viscosity-temperature property /
- regulation
1) 本文的英文电子版由Elsevier出版社在ScienceDirect上出版(http://www.sciencedirect.com/science/journal/18725813). -
表 1 实验用灰样灰的成分分析
Table 1 Chemical composition of ashes
Sample Content w /% SiO2 Al2O3 Fe2O3 CaO MgO TiO2 SO3 K2O Na2O NiO V2O5 P1 33.47 22.21 2.46 11.59 0.86 0.83 1.09 0.58 0.98 0.00 25.93 P2 20.82 13.98 18.03 6.52 1.43 0.38 2.67 0.55 0.88 12.00 22.74 P3 43.41 14.82 9.41 4.24 1.36 0.62 0.56 1.75 0.46 2.68 20.69 CC 45.38 29.99 3.41 15.64 1.16 1.12 1.64 0.78 0.88 - - XLT 34.87 11.78 11.69 27.93 2.80 0.70 9.72 0.43 0.08 - - 表 2 煤灰样品熔融特征温度
Table 2 Ash fusion temperatures of coal ash samples
Sample Temperature t/℃ DT ST HT FT P1 1381 1435 1487 1518 P2 1507 1532 ++ ++ P3 1439 1505 1548 ++ CC 1358 1367 1381 1401 XLT 1115 1150 1157 1162 表 3 添加16%CaO的P1灰渣的能谱分析
Table 3 EDX analysis results of P1 with 16% CaO addition
Sample EDX analysis results w /% V Al Si Ca Fe Mg K Na O 1 75.09 10.02 0.00 0.00 1.53 0.00 0.00 0.00 13.36 2 68.91 14.74 0.00 0.00 3.26 0.00 0.00 0.00 13.09 3 31.96 12.72 18.07 5.81 12.72 1.15 0.00 0.00 20.07 -
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