Modeling the formation of the quench product in municipal solid waste incineration (MSWI) bottom ash.
Modeling the formation of the quench product in municipal solid waste incineration (MSWI) bottom ash.
复制标题
对城市固体废物焚烧 (MSWI) 底灰中骤冷产物的形成进行建模。
DOI：
10.1016/j.wasman.2016.03.019
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发表时间：
2016
期刊：
影响因子：
8.1
通讯作者：
T. Shimaoka
中科院分区：
文献类型：
--
作者：
Kanawut Inkaew;Amirhomayoun Saffarzadeh;T. Shimaoka
本研究调查了实验室规模的淬火条件下底灰形态和矿物学的变化。其主要目的是阐明底灰颗粒周围淬火产物/层形成背后的机制。在实验中，将未骤冷的底灰加热至300 °C持续1小时，并在不同的模拟条件下用温水（65 °C）骤冷。在过滤和干燥后，通过组合方法即粒度分布分析、完整颗粒和薄片观察、X射线衍射法和扫描电子显微镜与能量色散X射线光谱法来分析灰分。结果表明，急冷后，底灰的形貌和矿物学发生了显著变化。新鲜淬火底灰主要由淬火产物，其特征在于由无定形和微晶硅酸钙水合物（C单键S单键H）相。这种产品还包括微小的矿物，玻璃，陶瓷，金属和有机材料。经XRD检测，淬火过程产生的主要矿物相为方解石、弗里德尔盐、水铝钙石和氢氧钙石。急冷产物的形成受底灰的细粒级（粒度<0.425 mm）控制。根据观测结果，提出了灰-水反应和底灰中骤冷产物形成的概念模型。
This study investigated changes in bottom ash morphology and mineralogy under lab-scale quenching conditions. The main purpose was to clarify the mechanisms behind the formation of the quench product/layer around bottom ash particles. In the experiments, the unquenched bottom ashes were heated to 300 °C for 1 h, and were quenched by warm water (65 °C) with different simulated conditions. After having filtered and dried, the ashes were analyzed by a combination of methodologies namely, particle size distribution analysis, intact particle and thin-section observation, X-ray diffractometry, and scanning electron microscope with energy dispersive X-ray spectroscopy. The results indicated that after quenching, the morphology and mineralogy of the bottom ash changed significantly. The freshly quenched bottom ash was dominated by a quench product that was characterized by amorphous and microcrystalline calcium-silicate-hydrate (Csingle bondSsingle bondH) phases. This product also enclosed tiny minerals, glasses, ceramics, metals, and organic materials. The dominant mineral phases produced by quenching process and detected by XRD were calcite, Friedel’s salt, hydrocalumite and portlandite. The formation of quench product was controlled by the fine fraction of the bottom ash (particle size <0.425 mm). From the observations, a conceptual model of the ash-water reactions and formation of the quench product in the bottom ash was proposed.