CAJ | 학술논문

利用程序升温热重(TG)技术对准东原煤(R-form)和酸洗煤(H-form)样品的热解过程进行了研究,同时,采用分布活化能模型(DAEM)法对两者的热解动力学参数进行了计算。结果表明,准东煤在热解过程中保持了丰富的孔隙结构；碱及碱土金属(AAEM)的存在不会对准东煤大分子网络结构造成显著影响,但会提高准东煤的平衡水分含量及二次脱气阶段挥发分释放速率,降低其主热解阶段挥发分释放速率及热解最终失重率；DAEM 法可以在较宽的温度范围内对准东煤的热解过程进行准确的描述,R-form 和 H-form 煤样品的热解活化能均随转化率的增大而升高；相同转化率下 R-form 煤样品的活化能高于 H-form,前者活化能分布函数的最大值出现在261.85 kJ/ mol 处,而后者出现在264.51 kJ/ mol 处；AAEM 的存在使准东煤的热解活化能升高且分布更加集中,使其热解反应活性降低；准东煤热解的频率因子与活化能之间呈现明显的动力学补偿效应。
이용정서승온열중(TG)기술대준동원매(R-form)화산세매(H-form)양품적열해과정진행료연구,동시,채용분포활화능모형(DAEM)법대량자적열해동역학삼수진행료계산。결과표명,준동매재열해과정중보지료봉부적공극결구；감급감토금속(AAEM)적존재불회대준동매대분자망락결구조성현저영향,단회제고준동매적평형수분함량급이차탈기계단휘발분석방속솔,강저기주열해계단휘발분석방속솔급열해최종실중솔；DAEM 법가이재교관적온도범위내대준동매적열해과정진행준학적묘술,R-form 화 H-form 매양품적열해활화능균수전화솔적증대이승고；상동전화솔하 R-form 매양품적활화능고우 H-form,전자활화능분포함수적최대치출현재261.85 kJ/ mol 처,이후자출현재264.51 kJ/ mol 처；AAEM 적존재사준동매적열해활화능승고차분포경가집중,사기열해반응활성강저；준동매열해적빈솔인자여활화능지간정현명현적동역학보상효응。
The pyrolysis process of raw (R-form) and acid-washed (H-form) Zhundong coal was investigatedby temperature-programmed thermogravimetry , and the kinetic parameters were calculated using distributed activation energy model (DAEM). The results show that the pore structures of Zhundong coal keep abundant inpyrolysis. The presence of alkali and alkaline earth metals ( AAEM) has no significant influence on the macromolecular network structure of Zhundong coal, but raises its equilibrium moisture content and release rateof volatiles during the secondary degasification stage. AAEM lowers release rate of volatiles during the main pyrolysis stage and final weight loss. The pyrolysis behavior of Zhundong coal could be described by the DAEM accurately within a wide range of temperature. The pyrolysis activation energy of R-form and H-form coal increases with increasing conversion. The activation energy of R-form coal is higher than that of H-form coal at the same conversion. The maximum value of activation energy distribution function of R-form and H-form coal is 261. 85 and 264. 51 kJ/ mol, respectively. AAEM elevates the pyrolysis activation energy, makes its distributionmore concentrated , and reduces the pyrolysis reactivity. The relationship between frequency factor and activation energy presents obvious kinetic compensation effect.