阐述了两段燃烧的特点，根据其原型对小型层燃手烧锅炉进行了改造，设计并安装了一二次风系统及烟气再循环系统，试运行结果满足节能及环保要求． The characteristics of the two stages of combustion are described. Based on the prototype, the small-scale burning hand-fired boiler is modified. The primary and secondary air systems and the flue gas recirculation system are designed and installed. The test results meet the requirements of energy saving and environmental protection.