摘要： 首先简介了干粉灭火剂的种类、特点、性能，讨论了燃烧机 理、传统干粉灭火剂及其灭火原理，重点探讨了灭火剂粒径与灭火效能 之间的关系，发现灭火效能随粒径减少而急剧增加。最后，探讨了超细 粒径干粉灭火剂的性能、研制和生产情况、优势及前景，并分析了纳米 干粉灭火剂的性能和应用前景。 

关键词：超细粉体；干粉灭火剂；灭火效能

Abstract:The types, characteristics,performances of dry chemicals are briefly introduced firstly. The burn mechanism,common dry chemicals and its fire extinguishing principle are disscussed. The relations between fire extinguish ing performance and particle size of dry powder are studied, It is found that fire extinguishing performance increases sharply as decreasing the particle size of dry powder.The performances、advances in development and production、 advantages and prospectives of ultra-fine dry powder fire extinguishant are discussed, and the performances and application prospective of the nano powder dry chemicals are analysed. 

Keywords: ultra-fine powder; fire extinguishingant; fire extinguishing performance