What is a boiler evaporator?

A mechanical device that uses the thermal energy of fuel or other sources to heat water into hot water or steam. It consists of two main parts: the pot and the stove. The original meaning of a pot is a container for water that is heated over a fire, while a furnace refers to the place where fuel is burned. The combustion of fuel, heat release, slag discharge, and similar processes are generally referred to as in-furnace processes ； The flow of water, heat transfer, thermochemistry, etc. are referred to as internal boiler processes. The hot water or steam generated in boilers can directly provide the heat energy needed for industrial and agricultural production as well as for people’s daily lives. It can also be converted into mechanical energy through steam power plants, and further converted into electrical energy via generators. A boiler that provides hot water is called a hot water boiler; it is mainly used for domestic purposes, with some application also in industrial production. A boiler that generates steam is called a steam boiler, often simply referred to as a boiler

The boiler evaporator is an evaporation and heat exchange device equipped with downcomers and draft tubes. It is located after the boiler’s superheater and before the economizer. In order to save space at the rear of the boiler and meet the requirements for safe water circulation,

The cylindrical shell in the boiler is known as the drum, or steam drum.

The main function of the boiler drum is to store water, separate steam from water, and remove salts and sediment from the boiler water during operation, thereby preventing boiler water containing high concentrations of salts and impurities from entering the superheater and turbine along with the steam. The internal equipment of the boiler drum includes steam-water separation and steam cleaning devices, feedwater distribution pipes, sludge discharge and chemical dosing equipment, etc. The function of the steam-water separation device is to separate the saturated steam coming from the water wall from the water, and to minimize the amount of fine water droplets carried in the steam. In medium and low-pressure boilers, baffle plates and slotted baffle plates are commonly used as coarse separation elements ； Boilers above medium pressure, in addition to making extensive use of various types of cyclone separators for preliminary separation, also employ louver screens, wire meshes, or vapor equalization plates for further separation. The boiler drum is also equipped with monitoring and protection devices such as a water level gauge and a safety valve.

In other words, it’s the boiler; if it’s called an evaporator, it doesn’t need to be regulated as a pressure vessel, which saves hassle