Boiler classification

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By application: Industrial boilers: Used for industrial production and heating, etc.; they are mostly low-parameter, low-capacity boilers that use a firebed for combustion, resulting in relatively low thermal efficiency. Power station boilers: Used for power generation. Most are high-parameter, large-capacity boilers with combustion in the fire chamber, offering high thermal efficiency. Ship boilers: used for powering ships; they are generally of low to medium parameters and operate on fuel, with the requirement of being small in size, light in weight, and portable. Locomotive boilers: used for powering locomotives. Most of them are boilers with low parameters and small capacity, operating with a combustion bed; they require a compact structure and to be movable. Based on the type of working fluid and its output state: Steam boilers: the output fluid is steam; Hot water boilers: the output fluid is hot water; Special fluid boilers: the output fluid is some special substances, such as certain organic compounds or mercury vapor. Classified by parameters, boiler equipment is divided into grades A, B, C, and D. Class A boilers refer to boilers with a pressure p (gauge pressure, the same below; Note 1-5) of ≥3.8 MPa. These include: (1) supercritical boilers, with p ≥ 22.1 MPa; (2) subcritical boilers, with 16.7 MPa ≤ p