Coal water slurry technology and gasification technology are used to simultaneously treat wastewater and CO₂; coal water slurry is prepared from fixed-bed coal gasification wastewater; and then, thermogravimetric analysis, Fourier-transform infrared spectrometry, scanning electron microscopy, energy-dispersive spectrometry, and X-ray diffraction are used to analyze the characteristic parameters of CO₂ gasification and the products that formed. The results reveal the following: (a) compared with coal water slurry, coal gasification wastewater slurry shows decreases in the gasification start temperature, gasification weight loss peak temperature, and gasification end temperature of 12°C, 22°C, and 17°C, respectively, and shows increases in the maximum and average reaction rates. In addition, the reactivity index for coal gasification wastewater slurry is found to be 14.29% higher than that for ordinary coal water slurry. (b) Coal gasification wastewater slurry produces more methane and other aliphatic hydrocarbon gases in the pyrolysis stage and more CO in the coke gasification stage than coal water slurry. (c) Coal gasification wastewater slurry contains many small particles and flocs on the surface of the coal and a high Na content (up to 8.07%) in the microarea. In addition, a richer pore structure exists on the surface of the gasification residue of the coal gasification wastewater slurry. (d) The components of the gasification residue for coal gasification wastewater slurry show relatively larger changes. Moreover, the catalytic effect of alkali metal may be weakened due to the reaction of the minerals in the coal to form a complex.

中文翻译：

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煤气化废水浆液CO2气化特性研究

采用水煤浆技术和气化技术同时处理废水和CO ₂；水煤浆由固定床煤气化废水制备；然后采用热重分析、傅里叶变换红外光谱、扫描电镜、能谱、X射线衍射等方法对CO ₂的特征参数进行分析气化和形成的产物。结果表明：(a)与水煤浆相比，煤气化废水浆液的气化起始温度、气化失重峰值温度和气化结束温度分别降低12℃、22℃和17℃ ，分别显示最大和平均反应速率的增加。此外，发现煤气化废水浆的反应性指数比普通水煤浆高14.29%。(b) 与水煤浆相比，煤气化废水浆在热解阶段产生更多的甲烷和其他脂肪烃气体，在焦炭气化阶段产生更多的 CO。(c) 煤气化废水浆在煤表面含有许多小颗粒和絮凝物，Na 含量高（高达 8. 07%) 在微区。此外，煤气化废水浆体的气化残渣表面存在更丰富的孔隙结构。(d) 煤气化废水浆液的气化残渣成分变化较大。此外，由于煤中的矿物质反应形成络合物，碱金属的催化作用可能会减弱。