Starting from what choose steam boiler?

Steam boiler evaporation
Optional steam boilers, steam boilers first look evaporation, evaporation should be close to the rated boiler you produce the maximum amount of steam or heat. Production of steam boiler is about 80% of the rated evaporation is more appropriate, because the pipeline losses, boiler scale, soot and other issues will make the boiler is impossib

le to achieve the best operating condition. Drew particular attention is that China's boiler evaporation is nameplate (nominal) evaporation under pressure, while some foreign boiler which evaporation is zero pressure evaporation, the actual boiler output vary greatly. Example: My 1.25Mpa, 4t / h boiler of its output is produced four tons per hour of steam 1930C, while some foreign furnaces produce 4 tons per hour of steam 1000C.
Steam boiler feed water temperature
Evaporation nameplate on the market the same boiler feedwater temperature of its 20 ℃, 60 ℃, 90 ℃, 100 ℃, 105 ℃ five kinds. The same boiler plate evaporation due to the high and low water temperature, the actual evaporation boiler will have a greater difference. For example: 20 ℃ water temperature of the boiler's output and the output water temperature 100 ℃, there are quite different. 20 ℃ water temperature of the boiler's output is 100 ℃, the output water temperature is 114%. Small capacity boilers are generally used at room temperature water, how you will feed water temperature to 90 ℃ or 100 ℃ before entering the boiler do? (Except thermal oxygen required)
Steam boiler working pressure
Boiler plate should be greater than the rated steam pressure steam supply pipe resistance and produce the desired working pressure combined. Please do not ignore the steam pipe resistance, due to its higher rated steam pressure saturated steam temperature is higher.
Steam boiler heating surface
Compare boiler heating surface (heat transfer area) is to choose a major boiler (design) parameters. Because the boiler heating area generally large output, overload ability, on the contrary, contribute to the small. Boiler capacity is the same, relatively large heating area, the exhaust gas temperature is relatively low, the boiler efficiency is relatively high, the heat generated by burning fuel more fully utilized, low fuel consumption.