Refractory Rod Dispensing in Kiln Wrap 2 Kiln Line No. 2 Line Kiln Refractory Material Distribution, Before Project Kiln Cooling Zone Burning Zone Sub-fired Zone Transition Zone Decomposition Zone Back Kiln 1 Refractory Material Casting Material Silicon Mg Chrome brick silicon brick brick code brick high alumina brick pouring material distribution length ç šm) in January 2197l218.6 live 722. coal injection pipe case kiln head coal injection pipe selection of the company's DBC type Duonex (multi Fule) spray The position of the center of the coal pipe in the section of the kiln mouth is located in the fourth quadrant (4D, 1-30). The opening of the inner wind valve is 0%, the opening of the outer wind valve is 10%, the spacing between the inner and outer sleeves is 20, and U29 is once. Causes of damage and countermeasures From the perspective of kiln knots in the kiln, the kiln skin is hung with about 10 kiln deposits at the front kiln, and then there is no kiln skin protection for the Zm firebricks, and there are thicker kiln skins after the Zm (2). (X) mm or so); In view of the damage of the firebrick, the brick surface wears smoothly, and accompanied by 516 deep pits (thickness of the fire pit in the pit is only 20-30m), the entire brick surface looks like Like traces left by water erosion. From the perspective of pulverized coal pipes, there are a small amount of pulverized coal coke deposits in the upper part of the port to cause partial clogging of the outlet, and the duct gap is somewhat deformed. The vertical difference is about 5mm. From the flame of the pulverized coal pipe, the flame is divergent and inactive. The flame is clearly swirled within a range of 3m from its port 2 and the flame diverges. Based on the above analysis, we can conclude that the partial flame of the pulverized coal pipe sweeps directly onto the fire brick of the former Zm and burns the kiln skin, which is the direct cause of the rapid damage of the fire brick. There are many reasons why the coal spray pipe flame is not normal. The following are the main ones. The position of the coal injection pipe centering the coal injection pipe is correct or not, and has a great influence on the flame discharge direction and the flame shape. Normally, the correct position is to make the pulverized coal pipe slightly offset, and the flame is just in contact with the material layer to maintain the best heat transfer conditions. If the pulverized coal injection pipe is excessively biased, it may cause the flame to be short and concentrated, the pulverized coal is incompletely burnt, the material is sticky, the grain size is easy to be coarse, and the kiln skin is partially thinned to form a ditch. If the position of the pulverized coal pipe is too high and the flame is too close to the kiln liner, the service life of the firebrick will be shortened. Therefore, the position of the pulverized coal injection pipe in the kiln should be continuously adjusted according to the actual conditions of each system to find the best location. Our company successively moved the positioning point of pulverized coal pipe to (50, 50), (40, 30), (20, 30), (0, 0) points, etc. The coal pipe is more suitable for the characteristics of the No. 2 line system at (0,0) point and can meet the production requirements. The primary air volume, wind speed, and proportion of internal and external winds should be adjusted according to the use of pulverized coal. When coal with less than 30% ash content and volatile matter content is above 1 % coal, this kind of coal has a high rate of ignition, high heat generation, and a relatively small amount of coal used. At this time, if the primary air volume and the wind speed are properly increased, then it is lower. The second air temperature can maintain a certain length of black fire head, and can produce a long high temperature zone. If the primary air volume and wind speed are too low and the secondary air temperature is too low, due to insufficient uniform mixing of the air and coal, and the ambient temperature cannot reach the ignition point of the pulverized coal, the burning of most of the pulverized coal particles will be delayed. The flames are dragged long, the flames are long and the temperature is low, so that the rotary kiln cannot produce high quality and high yields. If the primary air flow rate and speed are too high and the secondary air temperature is too high, the pulverized coal fires immediately after the coal nozzle blows. The length of the combustion zone is shortened, and the high temperature of the flame is concentrated on the front of the firing zone. The kiln skin will be greatly affected. . In the same way, if the internal wind (spiral wind) is too large, the flame is short and thick, and the rotation is severe, it is easy to burn the kiln skin, causing the kiln skin to fall off and the thermal system to be unstable. If the outside wind (axial wind) is large and the flame is long and thin, it will not damage the kiln skin, but it will make the kiln skin thick and affect the ventilation in the kiln. My company's original internal wind valve opening 0%, outside the wind valve opening 1 plus %, the spacing between the inner and outer sleeve is 20, a wind pressure of 29kpa, the flame is floating, not lively, swirling. After repeated debugging, the opening of the inner wind valve is controlled at plus kick 40%, the outer wind valve is fully opened 10%, the inner and outer sleeve spacing is 40, and the primary air pressure is controlled at 23-25kPa, the flame situation obviously improves and becomes lively Strong. At this time, the speed of the grate cooler should be increased in time, the thickness of the boring bed should be thinned, and the high and medium pressure air volume and excess air discharge volume should be appropriately increased. At the same time, a certain amount of air for the kiln should be maintained to ensure the combustion of pulverized coal. If the amount of air entering the kiln is too high, the burning speed and the flame temperature will be reduced; the lack of air will cause incomplete combustion, and the amount of secondary air required in the kiln must be adjusted in proportion. Concluding remarks The use of refractory bricks in the kiln determines the operating cycle of the system, and there are many factors that affect its service life, such as improper material configuration, abnormal flame, unstable system, etc., which requires us to be based on the actual situation in the production. On-site analysis and timely measures. 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