In an industrial boiler system, the normal operation of the system cannot be maintained as long as there is a boiler. A series of auxiliary equipment such as burners, water tanks, economizers, condensers, water pumps, instrument valves, etc. are also needed to make the whole The system keeps running. Among them, the burner is the most important auxiliary equipment. Zhengzhou Fangkuai boiler manufacturer recommends that everyone should pay equal attention to the choice of burners when purchasing industrial boilers.
In industrial boiler equipment, the burner is a device that continuously sends fuel and air into the furnace, rationally organizes the fuel flow, and makes a good mixture of fire and combustion quickly and stably.
According to the shape of the burner, the burner can be divided into two types: round and slot (groove). According to the air flow conditions of the burner, it is divided into two types: direct flow and swirl flow. DC burners are generally arranged in four corners, while swirl burners are often arranged in the front wall, front and rear walls, and on both sides.
The four-corner direct current burner is a relatively common burner type. The structure of this burner varies according to the type of fuel and the delivery method. Part of the nozzles can swing up and down and all adopt tangential combustion.
Everyone should pay attention to the fact that when choosing a four-corner direct-flow burner, if the airflow is found to be biased, it must be handled carefully, otherwise it will have a great impact on the fuel combustion.
The main reasons for the flow bias of the DC burner are as follows:
(1) The pressure on both sides of the jet is different. Under the action of the pressure difference, it is pressed to one side to produce a deflection. Because the four-corner jet of the direct current burner is tangent to the imaginary circle in the center of the furnace or the cross section of the furnace is not square, the angle between the two sides of the jet and the furnace wall is different. The side with a large included angle has a large space, and the high-temperature flue gas from the furnace is sufficient to supply air to the space; while the side with a small included angle is insufficient, the static pressure on the side with the large included angle is higher than the side with the small included angle. Under the action of the pressure difference, the jet deflects to the side with the smaller included angle. The greater the difference between the width and depth of the furnace, the larger the diameter of the tangent circle. The greater the difference in the angle between the two sides, the greater the pressure difference and the greater the jet deflection.
(2) The jet is forced by the lateral thrust of the jet from the adjacent corner burner upstream of the burner to force the airflow to deflect.
(3) The rigidity of the jet itself also affects the deflection of the airflow. The higher the jet velocity, the greater the momentum, the larger the nozzle cross-sectional area, and the smaller the nozzle aspect ratio, the stronger the rigidity and the smaller the jet deflection. Conversely, the worse the rigidity, the greater the deflection of the airflow.
