The fragmentation degree of limestone affects seriously the particle size distribution of sorbent in the desulfurization process in fluidized bed combustion. In this paper, the variation of particle size and differences in microstructure of calcination and fragmentation were measured under different fluidizing medium in the same equipment. The effects of temperature, reaction rate, SO₂ and CO₂ atmosphere, firing exhaust gas atmosphere on the calcination and fragmentation of limestone with different properties in the fluidized bed were studied. It was found that the size evolution of larger limestone was more obvious than that of finer ones. Under the condition of fragmentation, the particle size evolution of limestone was more intense than that in calcination. The particle size was smaller under the condition of a higher reaction rate. Higher temperature can promote the calcination reaction and reduce the particle size to a certain extent. The coarser fragmentation products at high temperature may be related to the enhancement of agglomeration between particles. SO₂ and CO₂ can inhibit the fragmentation of limestone and lead to coarsening of products, which further confirms the main contribution of calcination reaction to limestone size evolution. The main chemical reaction in a given atmosphere is direct sulphation reaction and the primary fragmentation is restrained by the high concentration of CO₂ in firing exhaust gas, which is more obvious in the oxygen-enriched exhaust gas.

石灰石的破碎程度严重影响流化床燃烧脱硫过程中吸附剂的粒径分布。在同一设备中，在不同的流化介质下，测量了粒径的变化以及煅烧和破碎的微观结构的差异。温度，反应速率，SO ₂和CO _2的影响研究了流化床中不同性质的石灰石在煅烧和破碎过程中的燃烧气氛，燃烧废气气氛。结果发现，较大的石灰岩的尺寸演化比较细的石灰石更为明显。在破碎的条件下，石灰石的颗粒演化比煅烧过程更剧烈。在较高反应速率的条件下，粒径较小。较高的温度可以促进煅烧反应并在一定程度上减小粒度。高温下较粗的碎裂产物可能与颗粒之间团聚的增强有关。SO ₂和CO ₂可以抑制石灰石的碎裂并导致产品变粗，这进一步证实了煅烧反应对石灰石尺寸演变的主要贡献。在给定气氛中的主要化学反应是直接硫酸化反应，主要的裂解受到燃烧废气中高浓度CO _2的抑制，这在富氧废气中更为明显。