Wang Bing, Zhao Cuiyu, Guo Congxiu
School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China.
Department of Architecture and Environmental Engineering, Taiyuan University, Taiyuan 030032, China.
ACS Omega. 2024 Jul 17;9(30):33090-33098. doi: 10.1021/acsomega.4c04453. eCollection 2024 Jul 30.
Entrained flow gasification provides a more efficient utilization method for high-sulfur petroleum coke. The operation temperature of the entrained flow gasifier must be above the ash fusion temperature (AFT) of petroleum coke due to the liquid slag discharge. In this work, petroleum coke was blended with high-calcium coal and high-iron coal, respectively, under a reducing atmosphere, and the variations in AFTs were recorded by an ash fusion temperature analyzer. The influence of mineral transformations on the ash fusion characteristics of blended ash was analyzed by X-ray diffraction and FactSage. The results showed that both high calcium coal and high iron coal could efficiently reduce the AFTs of petroleum coke. When the ratio of high calcium coal and high iron coal reached 60 wt %, the corresponding flow temperature (FT) of mixed ash decreased to 1225 and 1312 °C, respectively. With the content of high calcium coal increasing, coulsonite (FeVO), vanadium trioxide (VO) and nickel (Ni) with high-melting points tended to decrease, causing the decrease of AFT for mixed ash. As high iron coal was added, Ni and VO continuously kept decreasing. In particular, the percentage of FeVO first increased and thereafter decreased with high iron coal above 40 wt %.
气流床气化技术为高硫石油焦提供了一种更高效的利用方法。由于液态炉渣排放，气流床气化炉的运行温度必须高于石油焦的灰熔点（AFT）。在本研究中，在还原气氛下，分别将石油焦与高钙煤和高铁煤混合，并通过灰熔点分析仪记录AFT的变化。利用X射线衍射和FactSage分析了矿物转变对混合灰熔点特性的影响。结果表明，高钙煤和高铁煤均可有效降低石油焦的AFT。当高钙煤和高铁煤的比例达到60 wt%时，混合灰的相应流动温度（FT）分别降至1225和1312°C。随着高钙煤含量的增加，高熔点的方铁矿（FeVO）、三氧化二钒（VO）和镍（Ni）含量趋于降低，导致混合灰的AFT降低。随着高铁煤的加入，Ni和VO含量持续降低。特别是，当高铁煤含量超过40 wt%时，FeVO的含量先增加后降低。
