In an optional embodiment, the secondary air header could be arranged at the underside of the furnace, and talk with the secondary air pipe arranged at the decrease a part of the furnace by way of several upward pipes. The exterior secondary air is in contact with the whole section of the furnace bottom as a result of the wind cap is used for air supply, the stream field within the furnace is uniform, and the material after the reaction of the preheated gasoline and the inner secondary air reacts in your entire furnace area, and since the air equal below the tertiary air nozzle of the furnace If the ratio is lower than 1.0, there is no such thing as a oxygen-enriched ambiance beneath the tertiary air nozzle of the furnace, combined with the reaction process of the preheated gasoline and the internal secondary air, the precipitation of nitrogen-containing substances is strengthened, and the precipitated nitrogen-containing substances are uniformly decreased as an entire underneath the tertiary air nozzle of the furnace In a impartial ambiance, it is easy to transform to nitrogen, which reduces the level of nitrogen oxide emissions from preheated gasoline combustion.
The four burning-out wind nozzles 5 are distributed in a 4-corner tangential-circle mode, in order that the burning-out wind entering the hearth 6 types an imaginary tangential circle at the middle of the section of the hearth the place the burning-out wind nozzles 5 are located, pulverized coal combustible matters and gasoline combustible matters entering the area are fully mixed with combustion air to type vertical rotary airflow, the disturbance of flue gasoline within the center and later phases of combustion is enhanced, the issue of inadequate or uneven oxygen amount within the middle and later phases of combustion is fully compensated, the higher combustion temperature discipline within the hearth 6 is uniform, and the era charge of NOx is simulated on the premise of guaranteeing the burning-out rate. For the vertical boiler, the two pulverized coal low-nitrogen burners 2 are arranged in a aspect wall opposite-affect mode, the flame tails of the rotating jet flames cross and collide at the center of the section of the hearth 6, so that flame airflow with attenuated rotational stream strength is strongly disturbed, the mixing of pulverized coal, air and recirculated flue gas is enhanced, the temperature area of a primary combustion area is extra uniform, the local temperature is prevented from being too excessive, and the generation rate of NOx is inhibited.
By switching to GTL gas, you will help lower dangerous emissions of nitrous oxide and particulate matter and enhance local air quality immediately, with out interruption to operations. In the embodiment of the present invention, the interior secondary air surrounds the periphery of the preheated fuel, and the internal secondary air may provide air within the form of a hood to hurry up the mixing of the preheated gas and the interior secondary air to make sure rapid ignition of the preheated gas And stable combustion, the exterior secondary air ensures uniform movement area and elements in the furnace, the principle house of the furnace beneath the tertiary air nozzle of the furnace is a lowering environment, and the native oxygen-enriched ambiance is small, lowering the nitrogen oxide emission stage of preheating gasoline combustion. The strategy adopts the applied sciences of shade separation, grading air distribution, pre-combustion chamber with preheating kind SOFA and the like, and has the characteristics of quick and handy ignition, less consumption of pulverized coal ignition gasoline, stable combustion efficiency, large combustion regulation ratio, low NOx era amount and the like. In the present invention, the interior and exterior secondary air is controlled separately, that’s, the secondary air is controlled in different areas, which may improve the flexibleness of boiler control, help to strengthen the mixing of the gas carried by the primary air and the secondary air, and ensure the stability of ignition and combustion.
Secondly, hot primary air is used as an adherent air supply, in order that the rigidity of adherent air is elevated, the range is farther, the coverage surface is wider, a layer of protective gasoline movie is formed on the place near the partitions of the left and proper water-cooled partitions, and the high-temperature corrosion of the water-cooled walls at the 2 sides of the primary combustion area can be successfully prevented. The utility mannequin provides a low NOx combustion system of pulverized coal boiler, including the furnace that has circulation flue fuel spout, still be supplied with on the furnace and burn out wind spout, the furnace is related with pulverized coal low nitrogen combustor, flue gasoline circulation draught fan and overgrate air machine, pulverized coal storage supply system connects pulverized coal low nitrogen combustor to supply major air and buggy, the export flue gasoline of flue gas circulation draught fan is divided into two methods, the circulation flue gasoline entry of connecing pulverized coal low nitrogen combustor is for its partial inner overgrate air that gives, the other connecing circulation flue gasoline spout, the exit air of overgrate air machine is divided into two methods, the one connecing pulverized coal low nitrogen combustor is for its provision of inner, exterior overgrate air, the other connecing furnace burns out wind spout.
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