CAJ | 학술논문

为了解碱金属氯化物的硫酸化动力学机理,利用固定床研究了反应温度及反应气体 SO2,O2和 H2 O的体积分数对NaCl异相硫酸化率的影响,并采用 X 射线衍射仪对试样中元素进行分析。结果表明：NaCl异相硫酸化反应产物为 Na2 SO4；气体 SO2,O2和 H2 O 的体积分数的增加均可促进NaCl异相硫酸化；当反应温度低于773 K时,活化能为12 kJ/mol,此时温度变化对NaCl异相硫酸化率没有显著影响,当反应温度高于773 K时,活化能为92 kJ/mol,此时NaCl异相硫酸化率随温度升高呈指数增加；同时NaCl异相硫酸化高、低温反应机理不同,可能是由于高温下会形成共熔体引起的。
위료해감금속록화물적류산화동역학궤리,이용고정상연구료반응온도급반응기체 SO2,O2화 H2 O적체적분수대NaCl이상류산화솔적영향,병채용 X 사선연사의대시양중원소진행분석。결과표명：NaCl이상류산화반응산물위 Na2 SO4；기체 SO2,O2화 H2 O 적체적분수적증가균가촉진NaCl이상류산화；당반응온도저우773 K시,활화능위12 kJ/mol,차시온도변화대NaCl이상류산화솔몰유현저영향,당반응온도고우773 K시,활화능위92 kJ/mol,차시NaCl이상류산화솔수온도승고정지수증가；동시NaCl이상류산화고、저온반응궤리불동,가능시유우고온하회형성공용체인기적。
Sulfation of alkali chlorides has great significance on relieving slagging and corrosion on heating surfaces of the boiler during combustion of alkali-and chloride-rich fuels.On a fixed bed,this paper experi-mentally investigated the effects of sulfation temperature and reactants (like SO2 ,O2 and H2 O)concentra-tion on the heterogeneous sulfation of NaCl.The products were analyzed by the X-ray diffractometer.The results show that,only Na2 SO4 was found in the products.The increase in volume fraction of SO2 ,O2 and H2 O enhanced the sulfation ratio of NaCl.At temperatures below 773 K,the activation energy of the sulfa-tion reaction was 12 kJ/mol,indicating the sulfation ratio of NaCl changed little at low temperatures.How-ever,at temperatures above 773 K,the activation energy of the sulfation reaction was 92 kJ/mol,and the sulfation rate of NaCl exhibited an exponential growth with the temperature.The sulfation mechanism of NaCl at high and low temperatures was different,may be it is caused by formation of the eutectic at high temperatures.