锅炉改造后25%以上负荷水循环正常，采取的改造锅炉水循环系统的措施是成功的。

No water circulation problem will arise with the boiler load 25%d0 after water circulation system of boiler was remade.

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介绍了控制循环锅炉的结构特点，水冷壁等系统的设计准则，水循环系统设计的计算步骤及设计中关键数据的选取。

The pressure parts construction, design criteria of water wall, calculation procedure of water circulation and selection of critical parameters for controlled circulation boiler are introduced.

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探讨了燃气常压热水供热锅炉房燃气供气系统、热水循环系统、报警系统等的安全设计。

The safety design of gas supply system, hot water circulation system, alarm system and so on in atmospheric gas hot-water heating boiler room is discussed.

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