CAJ | 학술논문

为研究垃圾焚烧过程中NaCl的迁移和转化，在管式炉中进行了模拟垃圾焚烧实验，结合扫描电镜-能谱分析(SEM-EDS)和热力学平衡模拟计算，分析了温度、停留时间、烟气中的水分和 S 等对氯化钠迁移转化的影响。研究结果表明，温度升高能促进NaCl蒸发和分解，从而增加氯在飞灰和烟气中的分布。在1000℃时焚烧12 min后NaCl的迁移分布趋于稳定。SEM-EDS结果显示，800℃时NaCl以不规则的形态聚集在底渣基体表面；而1000℃时氯在底渣中扩散均匀，形成了半球状位错结构，飞灰中的氯为亚微米精细结构。热力学平衡计算表明，酸性氧化物Al2O3、SiO2与Na有很强的亲和力，能促进NaCl氧化分解生成HCl。烟气中的水分对Cl的迁移没有显著影响，水解的反应不易发生。烟气中的SO2和SO3能与NaCl反应生成Na2SO4促进其分解，且随温度降低促进效果越明显。
위연구랄급분소과정중NaCl적천이화전화，재관식로중진행료모의랄급분소실험，결합소묘전경-능보분석(SEM-EDS)화열역학평형모의계산，분석료온도、정류시간、연기중적수분화 S 등대록화납천이전화적영향。연구결과표명，온도승고능촉진NaCl증발화분해，종이증가록재비회화연기중적분포。재1000℃시분소12 min후NaCl적천이분포추우은정。SEM-EDS결과현시，800℃시NaCl이불규칙적형태취집재저사기체표면；이1000℃시록재저사중확산균균，형성료반구상위착결구，비회중적록위아미미정세결구。열역학평형계산표명，산성양화물Al2O3、SiO2여Na유흔강적친화력，능촉진NaCl양화분해생성HCl。연기중적수분대Cl적천이몰유현저영향，수해적반응불역발생。연기중적SO2화SO3능여NaCl반응생성Na2SO4촉진기분해，차수온도강저촉진효과월명현。
In order to investigate the partitioning and speciation of NaCl during municipal solid waste (MSW) incineration the artificial waste was experimentally burned in a quartz tube furnace. The scanning electron microscope-energy dispersive X-ray (SEM-EDS) analysis and thermodynamic equilibrium calculation were performed to study morphological transformation of chlorine. The factors include temperature, retention time, moisture in the flue gas and sulfur content on the NaCl partitioning. The results showed that temperature can promote the NaCl evaporation and decomposition, thus can increase chlorine distribution in fly ash and flue gas. After burning 12 min at 1 000℃ NaCl migration distribution tends to be stable in the experiments. The SEM-EDS results show that NaCl irregularly exists at the surface of slag substrate as the temperature is 800℃; and as the temperature is 1 000℃the chloride diffuse in the bottom slag, forming the half ball dislocation structure, while the chlorine forms the submicron fly ash in the fine structure of the nucleus of condensation. Thermodynamic equilibrium calculation show that the acidic oxides, Al2O3 and SiO2, have a strong affinity with Na, they can promote the oxidative decomposition of NaCl to generate HCl. The evident effect of moisture in flue gas on the NaCl partition-ing is not observed, as a result, hydrolysis reaction is too difficult to occur. The SO2 and SO3 in the flue gas can react with NaCl to generate Na2SO4, thus promotes its decomposi-tion, and with the decreasing temperature the effect of pro-moting is more obvious.