The process of using Industrial boiler involve multiple links such as fuels, auxiliary equipments, water treatments, stokers, steam load. More or less problems in the above five links affect the efficiency of the Small and medium-sized enterprises industrial boilers. In the paper, 5 factors above to reduce the thermal efficiency of the boiler are introduced, and specific measures to improve the thermal efficiency of the boiler were presented.% 工业锅炉使用过程涉及燃料、辅助设备、水处理、司炉工、运行负荷等多个环节。中小型企业工业锅炉或多或少在上述5个环节中存在影响锅炉效率的问题。文章从上述5个环节介绍了降低锅炉热效率的影响因素，并给出了提高锅炉热效率的具体措施。
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