Cause analysis
(1) The head of the lamp is located outside of the center air gun. Because of the high load of the center air gun, the head of the lamp is in the high temperature area, so the welding seam of the head of the lamp on the lamp is aged, leading to the flame burning from the weld and burning out the head of the lamp.
(2) The burner now in use was designed and manufactured according to the environmental requirements at that time. The central air gun is arranged in the central position of the burner, and the burner itself is composed of a burning path made up of brazing brick and fire path brick, and a burning flame is formed in the burning path.
(3) Due to the high hydrogen content in the fuel (61%), the flame burns faster, so the flame temperature in the central area of the firebrick is very high. Due to the damage or non-solid insulation lining between the firebrick installation and the furnace bottom, the temperature of the firebrick radiates to the furnace,the bottom plate and the upper cylinder of the burner cause the overtemperature of the burner housing.
(4) In the high temperature region at the center of the burner, local high temperature causes N2 and O2 in the air to react to produce a large amount of NOx (NO, NO2); In the fuel gas, the hydrogen content is too high (more than 20%), resulting in the fuel combustion speed is too fast, the flame center temperature is high, so a large amount of NOx is formed, resulting in the flue gas emission cannot meet the emission standards.
The measure
Combined with the change of fuel gas composition, the nozzle size of the center gun and side gun of the burner can be changed to reduce the load of the center gun by 20% and reduce the flame height. Adjust the nozzle size of edge gun, so as to adapt to the composition change of fresh air to a certain extent.
During the process of fuel gas entering the burner nozzle, affected by the high temperature flame of the surrounding main burner, it may be heated to carbonization and coking inside the burner under the nozzle, gradually causing partial flame burning and uneven furnace temperature. In view of this operation situation, the fuel gas composition should be adjusted, and the fuel gas should be separated from liquid in advance. The gas-liquid separator should be set with liquid level meter to drain out the liquid in time when the liquid phase is generated, so as to prevent the fuel gas from taking liquid.
In order to solve the overtemperature phenomenon of the outer wall of the concentrated flame burner, the innovative modification of increasing the height of the small brazier in the central gun of the burner, improving the flame core, reducing heat radiation and avoiding excessive heat radiation to the outer wall of the burner was adopted.
Adopt graded combustion (multi-gun structure), inside and outside two layer side air gun; Flue gas recycling technology, the change in burner burner brick structure form, will be cut between high ever-burning lamps only design auxiliary air rifle gun and level, the main gun out from the edge of the burner brick, implements the fuel gas classification and by introducing a relatively low temperature of flue gas spray hole high-speed, the burner flame cutting into high area, avoid the generation of high temperature, will be independent of its center point changes to eight small spear, point size by phi 80 changed to phi 34, into the wind form changed to ring into the wind, the evenness of fuel gas and air mixture. Fuel fractional combustion technology arranges fuel gas nozzles in a stepped shape. All the burning air is injected into the center of the burner and passes through the stepped fuel gas nozzles in turn to form several burning areas. Above the nozzle with the lowest position is the primary combustion area. The primary fuel gas is completely burned under the condition of a large amount of excess air, the temperature is not easy to rise, and the nitrogen oxide generated is reduced. The secondary fuel gas nozzle is usually arranged on the outside of the burner brick, and the secondary fuel is injected into the mixed flue gas from the upstream. High speed injection of secondary fuel gas can produce a low pressure zone, will be the furnace in cold sinking of oxygen poor smoke inhalation combustion zone to participate in the combustion, which not only reduces the flame temperature, but also can reduce the oxygen concentration in the combustion zone, thus reducing NOx generation.
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