1 College of Energy and Power Engineering, Nanjing Institute of Technology, Nanjing, People's Republic of China.
2 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, People's Republic of China.
Waste Manag Res. 2018 May;36(5):415-425. doi: 10.1177/0734242X18763064. Epub 2018 Mar 27.
To achieve high-temperature gasification-melting of combustible solid waste, ash melting behaviour under conditions simulating high-temperature gasification were studied. Raw ash (RA) and gasified ash (GA) were prepared respectively by waste ashing and fluidized bed gasification. Results of microstructure and composition of the two-ash indicated that GA showed a more porous structure and higher content of alkali and alkali earth metals among metallic elements. Higher temperature promoted GA melting and could reach a complete flowing state at about 1250°C. The order of melting rate of GA under different atmospheres was reducing condition > inert condition > oxidizing condition, which might be related to different existing forms of iron during melting and different flux content with atmosphere. Compared to RA, GA showed lower melting activity at the same condition due to the existence of an unconverted carbon and hollow structure. The melting temperature for sufficient melting and separation of GA should be at least 1250°C in this work.
为实现可燃固体废弃物的高温气化-熔融，研究了模拟高温气化条件下灰分的熔融行为。分别采用垃圾焚烧和流化床气化制备原始灰（RA）和气化灰（GA）。两种灰分的微观结构和组成结果表明，GA 具有更多孔的结构和更高含量的碱金属和碱土金属等金属元素。较高的温度促进了 GA 的熔融，在约 1250°C 时可达到完全流动状态。在不同气氛下 GA 熔融速率的顺序为还原条件＞惰性条件＞氧化条件，这可能与熔融过程中铁的不同存在形式和不同气氛下的通量含量有关。与 RA 相比，由于未转化碳和空心结构的存在，GA 在相同条件下表现出较低的熔融活性。在本工作中，GA 充分熔融和分离所需的熔融温度至少应为 1250°C。
