In order to describe the evaporation of potassium chloride (KCl) from biomass ash at ash-heating stage during biomass combustion, the ashes of pure corn stover and wheat straw and their mixtures with potassium chloride were heated in a simultaneous thermal analyzer (STA) and tube furnace (TF) at different temperatures. The evaporation behavior of KCl was analyzed and a distributed-molten model was established to describe the process. Good agreement was obtained between the predictions from the model and results from various experiments. The distributed-molten model was compared with our earlier established collected-molten model. It was found that the distributed-molten model is applicable in broader scope than collected-molten model especially for evaporation of KCl at low concentration, high temperature and large volume of ash. This provides theoretical support for solving the problems caused by the release of potassium salt in the combustion utilization of biomass, such as slagging, fouling and corrosion.

为了描述生物质燃烧过程中灰分加热阶段灰分加热过程中生物质灰分中氯化钾（KCl）的蒸发，在同时热分析仪（STA）中将纯玉米秸秆和小麦秸秆的灰烬以及它们与氯化钾的混合物加热管式炉（TF）在不同的温度下。分析了氯化钾的蒸发行为，并建立了一个分布熔融模型来描述该过程。该模型的预测与各种实验的结果之间取得了很好的一致性。将分布式模具模型与我们先前建立的收集模具模型进行了比较。研究发现，与熔融态模型相比，分散态模型适用范围更广，尤其适用于低浓度，高温和大灰分条件下的氯化钾的蒸发。