淮南煤煤灰熔融温度高导致其无法直接在气流床气化炉上使用,将淮南煤ZA煤分别与低灰熔融温度内蒙古煤ZB煤和ZC煤按照1∶9,2∶8,3∶7,4∶6,5∶5,6∶4,7∶3,8∶2,9∶1的质量比进行配煤,利用智能灰熔点测定仪(封碳法)对单煤及其配煤煤灰熔融温度进行测定,探究配煤比对煤灰熔融温度的影响,基于热力学平衡计算结果(利用FactSage8.1软件计算)探讨了配煤煤灰熔融温度变化机理;利用热重分析仪(TGA)对单煤煤焦和配煤煤焦的CO2气化反应性进行测定,并对反应动力学进行分析。结果表明:ZA煤灰在高温下生成莫来石是其熔融温度高的主要原因。ZA煤分别与ZB煤和ZC煤相配后,煤灰中莫来石含量降低,低熔点的钙长石、镁堇青石含量增加,使得配煤煤灰熔融温度降低。ZA煤焦、ZB煤焦和ZC煤焦三种煤焦的平均CO2气化反应速率分别为2.54%/min,3.49%/min和4.19%/min,ZA煤焦与CO2的气化反应最难发生,平均气化反应速率最小,ZC煤焦的CO2气化反应最容易,平均反应速率最大。与单煤煤焦相比,配煤煤焦气化反应过程呈现先促进后抑制的作用。三种单煤煤焦CO2气化反应活化能位于336.8kJ/mol~405.0kJ/mol之间,AB2(ZA煤与ZB煤的质量比为2∶8)煤焦和AC3(ZA煤与ZC煤的质量比为3∶7)煤焦的CO2气化反应活化能与ZB煤焦的CO2气化反应活化能和ZC煤焦的CO2气化反应活化能基本一致,表明配煤降低了配煤煤焦中ZA煤焦的CO2气化反应活化能。

Huainan coal ash cannot be directly used in an entrained-flow gasifier due to its high ash melting temperature. In this study, Huainan coal (ZA coal) was blended with two kinds of Inner Mongolia coal (ZB coal and ZC coal) with low ash melting temperature, respectively, to investigate the influence of coal blending on coal ash melting temperature. The blending ratio (mass ratio) was 1∶9, 2∶8, 3∶7, 4∶6, 5∶5, 6∶4, 7∶3, 8∶2, 9∶1, respectively. The ash melting temperatures of single coal and blending coal were determined using an ash melting tem-perature auto-analyzer in a weakly reducing atmosphere. The effect of coal blending on the ash fusibility was discussed based on the thermodynamic equilibrium calculation results (by Fact-Sage). The CO2 gasification reactivity of char was measured using a thermogravimetric analyzer (TGA), and the reaction kinetics were analyzed. The results indicate that the high ash melting temperature of ZA coal is primarily due to the formation of mullite at high temperatures. When ZA coal is blended with ZB coal or ZC coal, the content of mullite decreases, while the content of low-melting-point minerals such as anorthite and magnesium cordierite increases, leading to a re-duction in the ash melting temperature. The average CO2 gasification rates of ZA coal char, ZB coal char, and ZC coal char are 2.54%/min, 3.49%/min, and 4.19%/min, respectively, indica-ting that ZA coal char has the lowest gasification reactivity with CO2. While the ZC coal char has the highest average reaction rate, indicating that its gasification is easy to happen. Compared to the single coal, the gasification process of blended coal exhibits an initial promoting effect fol-lowed by an inhibitory effect. The activation energies for the CO2 gasification reactions of the three kinds of coal char range from 336.8 kJ/mol to 405.0 kJ/mol. The activation energies of AB2 coal (the mass ratio of ZA coal to ZB coal is 2∶8) char and AC3 coal (the mass ratio of ZA coal to ZB coal is 3∶7) char are consistent with those of ZB coal char and ZC coal char, indicating that coal blending can reduce the activation energy of the incorporated ZA coal char.