Characteristics and structures of fuel gas or oil boiler
Fuel gas boiler is unlike coal-fired boiler, it will need to use burner to inject fuel into boiler furnace. Oil or gas fired boiler take burning chamber without using grate. As the combustion of fuel gas boiler does not produce ash and slag, so this kind of boiler can be operated without sludge discharge facilities. If oil spraying into furnace mixed with air in a certain range or go out, it would be easy to explode. So the fuel gas boiler always take automatic burning and control systems. The structure of fuel gas boiler is compact, about small boiler, ventilation, water supply, control and auxiliary equipment are all set in a chassis. Large and medium-sized also can be assembled at factory. Main pressure parts and connect ways are mentioned below:
The main pressure parts of fire tube boiler: boiler shell, tube plate, furnace, smoke tube;
The main pressure parts of water tube boiler: steam drum, water wall, boiler tube bundle, coil, header;
The connection ways of fuel gas boiler main pressure parts: mainly for welding, some parts also can be expanded joint;
Improve the quality of atomization, reduce oil droplet diameter.
Increase the relative velocity of air and oil droplet.
Take the reasonable air distribution.
Diffusion combustion: the combustion method is not mixed in advance, gas and air will take a diffusion in the gas jet and burn. Its advantages are burn stability and burner structure simple, but the flame is to long and prone to incomplete combustion to make heating area carbide.
Take combustion premixed part air:The combustion mode is that mix some air with gas in advance before burning( an excess air coefficient between 0.2-0.8). The advantages are burning flame clear, burning reinforcement, high thermal efficiency. But the combustion is instable and higher requirement for primary air and burning ingredients. Gas burner generally use the combustion mode.
Flameless combustion:The combustion mode require air and gas mixing before burning. The once excess air coefficient is equal to the fuel combustion air surplus coefficient, it does not need to get oxygen from the surrounding air in the process of combustion. When the gas and air mixture reach the combustion zone, it can be burnt out in a flash.
Combustion characteristics of oil fired boiler:
The oil fuel is a kind of liquid fuel, its boiling point is always lower than the ignition, so the combustion of fuel is always in the gas phrase. Fuel oil become oil droplet after atomizing that spray into the furnace, and then it will be heated by high temperature flue gas in furnace to take gasification. Vaporizable oil mix up with around air to form a flame. Some heat from the burning pass onto oil droplet to make oil droplet gasification and combustion until burnt out. The smaller diameter of oil droplet, the faster burning. Similarly, the required oxygen of oil droplet combustion can be supplied in a timely manner, the oil droplet will be burnt faster also. So strengthen the oil burning must do the following:
Combustion characteristics of gas fired boiler
Burning high calorific value of gas will need a large amount of air, to make gas fully burning requires to mix with lots of air. There are no fuel atomization and gasification process in the gas combustion process. The way of mixing with air and gas has great influence on the strength of the combustion, flame length and flame temperature. According to different mixing mode, fuel gas combustion method can be divided into three types:
More detail about machine and our factory,u can visit my website" www.xindaboiler.com"
