Pulverized coal burner in many times, is a relatively cost-effective product, many customers have a certain understanding of pulverized coal burner, but also have questions, here small make up and we briefly talk about the classification and principle of pulverized coal burner.
With the demand of controlling serious pollutant, the new high efficiency pulverized coal industrial boiler takes the lead in coal-burning equipment with its excellent combustion technology and smoke pollution control technology.The following is the classification of burners involved in its combustion and the principle of some burners.
Burner classification
1, pulverized coal pre-combustion chamber burner
This is the earliest and most widely used new pulverized coal burner in China.The pre - combustion chamber burner is a pre - combustion chamber made of refractory or heat - resistant steel.
2. Blunt burner
The pulverized coal burner was developed by huazhong university of science and technology in the early 1980s.It is widely used in boilers burning inferior bituminous coal, lean coal and anthracite to stabilize flame and improve combustion.It is to set a non-linear object -- blunt body at the outlet of each corner primary air nozzle of angular type pulverized coal burner, so that the airflow of coal in the wake area of blunt body produces backflow and absorbs high-temperature flue gas, so as to facilitate the ignition of fuel and the stability of flame.After catching fire, the pulverized coal torch is burned in the furnace by four corners.
3. Flame stabilized ship burner
Also known as ship type pulverized coal burner was developed by tsinghua university in the mid-1980s.The structure is a ship flame stabilizer installed in the primary tuyere of the conventional dc pulverized coal burner, and a small oil gun is set in the center.After adopting this structure, pulverized coal air flows around it and into the furnace, forming a girdle jet not far from the primary air nozzle.High temperature, high pulverized coal concentration and appropriate oxygen concentration areas are formed at the outer edges of the girdle waist, becoming a good ignition heat source for igniting pulverized coal airflow and stabilizing combustion in the furnace.
4, thick and light burner
Thick and light burners use centrifugal force or inertia force to divide the primary air flow into two streams: rich powder flow and poor powder flow.In this way, under the condition that the total amount of primary air remains the same, a stream of rich coal powder with high concentration can be separated.Because the high concentration pulverized coal airflow has good ignition and combustion stability, it does not need particularly strong thermal reflux.
In this way, the pulverized coal burner can not only strengthen ignition, but also avoid the disadvantages brought by the strong heat reflux.In this way, the burner has wide coal adaptability, which is not only used for burning high-ash low-quality bituminous coal and high-moisture lignite, but also anthracite and lean coal.
