Gas vertical steam generator atmospheric pressure boiler

Gas vertical steam generator atmospheric pressure boilerIt is an important component of steam power plants. Power plant boilers, steam turbines, and generators are the main engines of thermal power plants, therefore power plant boilers are important equipment for producing electrical energy. Industrial boilers are necessary equipment for various industrial enterprises to provide steam for production and heating. There are many industrial boilers that require a large amount of fuel consumption. The waste heat boiler that uses high-temperature exhaust gas from the production process as a heat source plays an important role in energy conservation. Marine boilers are installed on various ships, and the steam generated is used to drive steam powered machinery. As the main equipment of steam locomotives, locomotive boilers still have certain application prospects. The boiler is subjected to high temperature and pressure, so safety issues are very important. Even small boilers can have serious consequences in the event of an explosion. Therefore, there are strict regulations on the selection, design calculation, manufacturing, and inspection of boiler materials.

Gas vertical steam generator atmospheric pressure boilerIt can be classified first according to different methods. Boilers can be divided into industrial boilers, power plant boilers, marine boilers, and locomotive boilers according to their uses; According to the outlet pressure of the boiler, it can be divided into low pressure, medium pressure, high pressure, ultra-high pressure, subcritical pressure, supercritical pressure and other boilers; According to structural principles, it can be divided into modular boilers (modular steam generators) and inner tank boilers.

The current series of power plant boilers in China include: medium pressure 3.9MPa; High pressure of 10mpa; Ultra high pressure of 14MPa; Subcritical pressure of 17 megapascals. The current industrial boiler series in China are 0.5MPa, 0.8MPa, 1.3MPa, and 2.5MPa. According to the flow paths of water and flue gas, boilers can be divided into fire tube boilers, fire tube boilers, and water tube boilers. Fire tube boiler and fire tube boiler, also known as shell boiler; According to the circulation mode, it can be divided into natural circulation boilers, auxiliary circulation boilers (i.e. forced circulation boilers), once through boilers, and composite circulation boilers. A composite cycle boiler consists of an auxiliary cycle boiler and a once through boiler, including a low cycle ratio boiler (see power plant boiler). Boilers are divided into combustion chamber combustion furnaces, stratified combustion furnaces, and fluidized bed combustion furnaces according to their combustion methods.

Boiler - Working Process (Schematic Diagram and Combustion System Diagram of 120t/h Natural Circulation Coal fired Power Plant Boiler). Firstly, coal is ground into powder. Coal powder is transported by air and sent to the furnace for combustion through burners installed on the furnace wall. The gas temperature at the center of the flame reaches 1500-1600 ℃. The evaporation heating surface of the boiler is installed on the inner wall of the furnace, forming a water-cooled wall that absorbs the radiation heat from the high-temperature flames and flue gas inside the furnace, reducing the outlet flue gas temperature to 1000-1150 ℃. Several rows of slag discharge condensation pipes are formed at the upper part of the water-cooled wall on the rear wall (at the inlet of the horizontal flue), and the slag discharge pipes are arranged very thin to prevent slagging. In order to prevent ash or slagging on the heating surface of the boiler, a soot blower is also used.

The superheater is located in the horizontal flue. Its function is to heat the saturated steam in the steam drum into superheated steam at a certain temperature, in order to improve the economy of the power plant. After passing through the superheater, the temperature of the flue gas drops to 500-600 ℃ and then enters the tail flue. One of the heating surfaces in the tail flue is the economizer. It is composed of many serpentine tubes with flat heads * head * head * head * head * head * head * first. Its function is to preheat the feedwater before entering the steam drum and reduce the exhaust temperature. The other tail heating surface is the air preheater. Its function is to heat the air to a certain temperature before it enters the furnace, thereby improving combustion, further reducing exhaust gas temperature, and improving boiler efficiency