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Anonymous users2024-02-07At present, most of the domestic pre-calcining kilns use three-channel or four-channel burners, and the flame shape is adjusted by the reasonable matching of internal and external air. Since the decomposition rate of raw material CAC03 in the pre-decomposed kiln has been as high as about 90%, the general outflow wind speed should be appropriately increased, so that the firing zone can be controlled to be slightly longer, so as to facilitate the pre-firing of high silicic acid rate materials and the formation of fine uniform clinker particles. If it is necessary to shorten the flame to concentrate the high temperature zone or the coal quality is poor and the combustion speed is slow, the internal flow air can be appropriately increased to reduce the external flow wind; If the coal quality is good or the kiln skin is too thin, the surface temperature of the kiln is too high, and the flame needs to be lengthened, the outflow air should be increased and the inflow wind should be reduced.
However, when the outflow air volume is too large, it is easy to cause the flame to be too long, resulting in too long floating kiln skin, easy to form a back circle, and the temperature of the kiln tail will be too high; The internal air volume is too large, which is easy to cause the flame to be thick and short, divergent, not only the kiln skin is easy to be ablated, but also easy to produce coarse clinker grains and yellow heart clinker.
If it is found that the height of the material belt in the kiln is very low and slides down the surface of the refractory bricks, the material diverges without viscosity, the particles are fine, and the clinker FCAO is high, it means that the temperature of the firing zone is too low, and the amount of coal used in the kiln head should be increased, and the internal flow air should be increased at the same time, and the external flow wind should be reduced accordingly, so that the flame should be shortened, the firing zone should be relatively concentrated, and the temperature of the firing zone should be increased, so that the clinker granulation tends to be normal. If it is found that the local temperature of the kiln with the firing belt is too high or the kiln skin falls off in large quantities, it means that the firing temperature is unstable, the flame shape is not good, and the flame diverges and washes the kiln skin and fire bricks. At this time, the internal flow air should be reduced or even closed, the amount of coal used in the kiln head should be reduced, the external flow air should be increased, the flame should be elongated or the coal injection pipe should be moved, the position of the fire point should be changed, and the kiln skin should be re-hung to restore the firing condition to normal.
In actual operation, if it is found that the material of the firing belt is sticky, the height of the belt is relatively high, the material is not flexible to roll, and sometimes the cake-like material appears, which means that the temperature in the kiln is too high. At this time, the amount of coal used in the kiln head should be appropriately reduced, and the internal flow air should be appropriately reduced, and the external flow should be increased to elongate the flame and alleviate the too high temperature in the kiln.
The flame control of the rotary kiln is a major difficulty in the production of the rotary kiln. Improper operation and excessive flame will cause a waste of resources and have a negative impact on the quality of calcined products. Only with precise flame control can we avoid wasting energy and maximize benefits.
The control of the flame in the kiln is a dynamic process that requires the operator to keep a careful observation at all times and make timely adjustments.
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Anonymous users2024-02-06The pressure is equal, and the flame will not be too large when the pressure on both sides is the same.
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Anonymous users2024-02-05Good burner, the flame is light blue, the fire is vigorous, and the height and size of the flame are uniform. If the flame is very small, it is abnormal. The main reasons for the small flame generation and its elimination method are as follows: Zheng Hekuan (1).
When the gas stove is cooking food, occasionally overflow flows out or foreign matter falls into the fire hole, which blocks the fire hole of the burner, so that the flow of gas and air mixture is blocked, and the flame is small and weak. The method of teasing removal is to remove the burner, clean the blocked fire hole, and clean it with water. After such treatment, the fault of the fire shouting flame can generally be eliminated; （2）
The air supply is running out. When the LPG in the cylinder of the gas stove is about to run out, the combustion flame will be small due to insufficient pressure or too much residual liquid in the cylinder. At this time, the cylinder should be replaced with a new one; （3）
The pressure reducing valve nozzle or gas stove nozzle is clogged. When the pressure reducing valve or the nozzle of the burner stove is blocked, the gas is not emitted smoothly and the combustion flame is weak and weak. The elimination method is to dredge the nozzle with a thin steel wire; （4）
The angle valve is too small, and the large angle valve can be opened at this time; （5）
The hose has a small amount of air when it is flattened or bent. If the flow of the hose is blocked when it is bent, the hose can be straightened; If the hose is flattened, it can be replaced with a new one; （6）
Gas stoves with duct burners may also have a small flame due to the small diameter of the pipes and the corrosion and blockage in the pipes. You can contact the gas company to solve the problem.
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