Introduce several combustion methods of gas boilers
08/23/2021The combustion methods of gas boilers and their respective characteristics and scope of application are as follows:
2. Fire bed combustion: the fuel is layered on the grate, and the air enters the hearth through the fuel layer through the gap of the grate. Most of the fuel is burned in layers on the grate, and a small part of the fine particles and precipitated from the fuel layer Combustible gas burns in the space above the fuel bed, and its equipment becomes a fire bed furnace, a bed furnace or a grate furnace. No milling equipment is needed, the system sees you, but it is controlled by the size of the grate structure. Scope of application: used for industrial boilers and small power station boilers with gas boiler capacity less than or equal to 35.
3. Cyclone combustion: It is characterized by the fuel flow entering the cyclone tube tangentially or axially, such as fine coal and coarse powder. The high degree of secondary air tangentially enters the cyclone tube to cause a strong swirling airflow, which carries the fuel particles to rotate forward. Most of the large particles are thrown to the slag film on the wall of the tube and burned, and a small part is subdivided into the tube and suspended and burned. The liquid slag Flowing out of the slag opening, the high-temperature flue gas enters the burnout-the cooling furnace is further burned out and cooled. The relative speed of fuel and air is greatly increased, which intensifies combustion. The residence time in the cylinder is prolonged, and the boiler has high thermal efficiency. The cyclone has a small volume and lack of cooling, which is beneficial to maintain high temperature and save steel. It is suitable for a wide range of coals and has a high slag discharge rate. The liquid slag can be made into slag wool or other building materials. The disadvantage is that the structure and manufacturing process are more complicated, the lining maintenance workload is large, the high-pressure blower is required, the fly ash is very fine and easy to deposit, and the NOz is high in severe shots. There are two types of gas boiler cyclone furnaces: vertical and horizontal. The application range of the gas boiler cyclone combustion is already suitable for the comprehensive utilization of fuel calcium magnesium phosphate fertilizer.
4. Boiling combustion: The air is evenly sent into the furnace through the air distribution plate at an appropriate flow rate to blow up the coal particles and burn them in a boiling (fluidized bed) state on the fire bed. Due to the strong relative movement between the coal particles and the air , And the residence time in the fluidized bed is longer, so the combustion is greatly enhanced. The heating surface (i.e. buried pipe) is often arranged in the fluidized bed, and the ash after combustion flows out from the overflow. For low-quality fuels that cannot be burned in other combustion equipment (such as coal, stone coal, oil shale, etc.), stable fuels can be obtained in a fluidized bed. After solving the problems of wear and efficiency, it is expected to be applied to larger capacity boilers.
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