How are steam boilers classified?
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A boiler consists of two parts: the pot and the furnace. The pot is a metal container used to hold water, while the furnace is the part where fuel burns. The water in the pot absorbs the heat generated by the burning fuel, turning into steam. The basic principle is similar to that of boiling water; the pot functions like a kettle, and the furnace functions like a stove. Classification of steam boilers: 1. By fuel, they can be divided into coal-fired boilers, oil-fired boilers, gas-fired boilers, electrically heated boilers, nuclear energy boilers, waste heat boilers, and so on. Among them, the first 4 types are the most common and widespread, with coal-fired boilers having the lowest operating costs; II. By heat transfer method: they can be classified into water-tube boilers, fire-tube boilers, and water-and-fire-tube boilers, etc. Fuel and gas boilers are generally fire-tube boilers; a typical model is the WNS series (horizontal combustion boiler with an internal combustion chamber). Such boilers feature a simple structure, and their rated evaporation capacity is usually not high (typically 10 tons or less; there are also larger models, but generally not exceeding 35 tons). They can reach operating pressure quickly, and their requirements regarding boiler water quality are relatively low. Coal-fired boilers, on the other hand, are generally water-tube boilers. Water-tube boilers have higher thermal efficiency, but they have a more complex structure, and their requirements regarding boiler water quality are higher. In simple terms, a steam boiler is a device that absorbs the heat energy from fuel combustion to convert water into steam with specific parameters (such as pressure and temperature). A boiler consists of two parts: the pot and the furnace. The pot is a metal container used to hold water, while the furnace is the part where fuel burns. The water in the pot absorbs the heat generated by the burning fuel, turning into steam. The basic principle is similar to that of boiling water; the pot functions like a kettle, and the furnace functions like a stove.
Hello, this topic is a bit broad; here’s something for your reference: Boilers can be classified from different perspectives: by flue gas flow – water-tube boilers, fire-tube boilers, and combined water-fire-tube boilers; by the placement of the boiler drum – vertical boilers, horizontal boilers; by the number of boiler drums – single-drum boilers, double-drum boilers; by purpose – domestic boilers, industrial boilers, power plant boilers, boilers for vehicles and ships; by working medium – steam boilers, hot water boilers, dual-purpose steam and hot water boilers, organic heat carrier boilers; by installation method – quick-install boilers, assembled boilers, bulk boilers; by fuel – coal-fired boilers, oil-fired boilers, gas-fired boilers, pulverized coal boilers, waste heat boilers, electrically heated boilers, biomass boilers; by water circulation – natural circulation, forced circulation, once-through boilers, combined circulation; by pressure – atmospheric pressure boilers, low-pressure boilers, medium-pressure boilers, high-pressure boilers, ultra-high-pressure boilers; by the number of units – single-drum boilers, double-drum boilers; by combustion type – internal combustion boilers, external combustion boilers; by working fluid – natural circulation boilers, forced circulation boilers, once-through boilers, etc. Based on the manufacturing grade and steam pressure, boilers are classified into low-pressure boilers (P〈2.45 MPa), medium-pressure boilers (3.8〈P〈5.8 MPa), high-pressure boilers (5.9〈P≤12.6 MPa), ultra-high-pressure boilers (12.7〈P≤15.8 MPa), subcritical boilers (15.9〈P≤18.3 MPa), supercritical boilers (22.1〈P≤30 MPa), and ultra-supercritical boilers (>30 MPa).