What is a steam generator?

　　Steam boiler, sometimes also calledSteam Generator，is an important component of steam power equipment. Power plant boilers, steam turbines, and generators are the main components of thermal power plants, so boilers are important technical equipment for power generation in power plant design. Industrial boilers are indispensable equipment for steam production and heating in various industrial enterprises. There are many industrial boilers, which consume a large amount of fuel. In the production process, waste heat boilers using high-temperature exhaust gas as a heat source play an important role in energy saving. Marine boilers are installed on various ships, and the generated steam can be used to drive steam-powered machinery. Locomotive boilers, as the main equipment of steam locomotives, have certain application value. Boilers are subjected to high temperature and high pressure, and the research on safety management issues is crucial. Even a small boiler, once exploded, the consequences are very serious. Therefore, the selection of boiler materials, design method calculation, manufacturing and inspection, etc., all have their own strict regulations.

　　Steam GeneratorCan be classified in different ways. Boilers can be divided into industrial boilers, power plant boilers, marine boilers, locomotive boilers, etc. According to the pressure of boiler exporting enterprises in China, they can be divided into low-pressure, medium-pressure, high-pressure, higher-pressure, subcritical pressure, and supercritical pressure boilers. According to the structural principle, it can be divided into modular boilers (modular steam generators) and inner-tank boilers.

　　China's existing industrial boiler series are 0.5 mpa, 0.8 mpa, 1.3 mpa and 2.5 mpa respectively. The boiler system can be divided into fire-tube boilers, fire-tube boilers, and water-tube boilers along the flow path of water and smoke. Among them, fire-tube boilers and fire-tube boilers are also called shell boilers. According to different circulation methods, they can be divided into natural circulation boilers, auxiliary circulation boilers (forced circulation boilers), direct flow boilers, and compound circulation boilers. Composite material recycling boilers are a combination of auxiliary circulation boilers and direct flow boilers, including low circulation rate boilers (see power plant boilers). According to different combustion methods, boilers are divided into chamber combustion furnaces, layer combustion furnaces, and boiling furnaces.

　Steam Generator-Working process (schematic diagram of 120 tons/hour natural circulation coal-fired power plant boiler and combustion system). First, coal is ground into powder on a smoke machine. The pulverized coal is transported by air and enters the furnace for combustion through the burners installed on the furnace wall. The gas temperature in the center of the flame can reach 1500 ~ 1600. The evaporative heating surface of the boiler is installed on the inner wall of the furnace, forming a water wall, absorbing the radiant heat of the high-temperature flame and flue gas in the furnace, and reducing the flue gas temperature at the furnace outlet to 1000-1150. The upper part of the rear wall water wall (from the horizontal flue gas inlet) constitutes a relatively thin water heat condensation tube to prevent residue. In order to prevent the accumulation of dust or residue on the heating surface of the boiler, a blower is also used.

　　The superheater of the steam generator is located on the horizontal flue gas duct, the purpose is to heat the saturated pressure steam produced by the boiler drum to a certain temperature of superheated steam, improving the economic efficiency of power plants in China. After the smoke passes through the superheater, the temperature drops to 500 ~ 600. Enter the tail flue. One of the heating surfaces of the tail chimney is the economizer. It consists of many parallel serpentine pipelines. Its function is to preheat the water before it enters the boiler drum, thereby reducing the exhaust gas temperature.

       The above is an introduction to the relevant content of steam generators.