Direct-flow burner layout and common faults

Direct-flow burners are usually called four-angle nozzles in boiler maintenance, and their outlet airflow is direct current jet. In this kind of direct current burner, coal powder and burning air are injected into the furnace by different nozzle with non-rotating DIRECT current jet flow. According to the flow medium is different, the burner nozzle can be divided into: a, three times of tuyere tuyere, secondary tuyere, wind is used for conveying pulverized coal heating, make the coal through a duct and enters the furnace to the burner, secondary air is high temperature wind with a wind mixing pulverized coal to meet the quantity of air required for the pulverized coal combustion, three times the wind out of the coal pulverizing system with pulverized coal into the furnace exhaust to high speed to adjust the working condition of pulverized coal combustion, considering the needs of the pulverized coal ignition and burn out, different outlets with different flow velocity, this part mainly in the operation of the adjustment.

Direct-flow burners can be arranged in a variety of ways:

1. Single-cut circular type, namely the primary air of the four-angle nozzle, and the geometric axis of the secondary air is tangent to a same-diameter circle in the center of the furnace;

2. The two angles are tangent to each other;

3. Double tangential circle layout, in which the primary and secondary air of the four corners are cut to different tangents, and the first, second and third tuyere of the four corners have different tangents;

4. Directional or six-directional tangential circles, which are used in large stoves;

     5.double furnace circular cutting layout, our power plant furnace with four Angle layout circular burner, its advantage is easy maintenance and maintenance of maintenance and operation regulation.

Common equipment defects of direct-flow burners in operation basically include the following situations:

     1, the nozzle is blocked, especially when the cease-fire nozzle is used to adjust the load, the primary air tuyere that stops operation will form a high temperature area and coking, serious coking, will make the primary air tuyere all blocked, so that the coal air jet can not go out;

2. The tuyere of primary air, secondary air and tertiary air is shape-burned and deformed. After the tuyere that stops operating forms a high temperature zone, although there is no coking, the shape of each tuyere is burned and deformed;

3. The secondary damper plate is stuck. Due to uneven thermal expansion during operation, the adjusted baffle plate is stuck in a certain position and cannot be adjusted or switched;

4. The nozzle falls off. During the operation of the burner, due to poor operation adjustment, the positive pressure of combustion makes the nozzle burn out and falls off, and damages the water-wall pipe, thus causing the boiler operation interruption and other unsafe defects.