For the record, it must be noted that: 1, zinc oxide rotary kiln delivers coal too early or too much.
Gas or pulverized coal is not easy to burn. Even if there is not much coal, smoke will emit black smoke, and the fire will get darker and darker, and even no flame can be seen. At this time, the amount of coal should be reduced or the coal supply should be suspended, and an appropriate amount of coal should be sent to the kiln after it is burned to the temperature.
2, in order to stabilize the flame rotary kiln exhaust can't be too big:
3. Of course, the displacement of rotary kiln should not be too small:
4. The primary air of rotary kiln should not be too large, which will cause fuel to be mixed.
5, rotary kiln primary air should not be too small:
The following is a description of the ignition operation of magnesium metal rotary kiln, which is for the reference of rotary kiln users only: Please pay attention to the update of the known contents in the industry for the specific items that need to be checked before ignition.
A, magnesium metal rotary kiln before ignition matters needing attention:
1. Before ignition, check whether the pulverized coal pipeline and the combustion air main pipe are closed.
2. Open the fan baffle at the kiln end.
3. Put a proper amount of dysprosium firewood in front of the coal injection pipe 1 m to pour some waste engine oil on the firewood, which is helpful for combustion.
4. When injecting pulverized coal, the combustion zone must maintain a certain temperature. When the furnace temperature is higher than 800 degrees, pulverized coal must be injected with open flame.
5. When spraying pulverized coal, it is forbidden to stand near the kiln head to prevent the pulverized coal explosion from hurting people.
6. Before ignition, there must be enough open flames in the rotary kiln to ensure ignition safety.
Second, the metal magnesium rotary kiln drying kiln operation essentials:
1. After completion of masonry, all castable materials and refractory bricks will be naturally cured for about 48 hours. After the above conditions are met, the kiln drying is carried out according to the kiln temperature curve of the process belt (as shown in the figure).
Temperature control chart of magnesium metal rotary kiln drying kiln
2. The temperature curve of drying kiln has several heat preservation processes:
① The evaporation of gravity water or free water should be controlled at 100- 150 degrees;
(2), crystal water is being removed, to control at 350 degrees:
(3), is the decomposition of carbonate, generally controlled at 650 degrees;
(4), is the transformation of crystal phase, controlled at about 820 degrees. There must be enough constant temperature time in the above stages. The principle is that the more complex the structure, the slower the required heating rate and the longer the constant temperature time at each stage.
3. Turn on the kiln tail fan and check the instrument display of each department.
4. After checking the clean building materials, close the feed hole and observation door of the preheater.
The firewood is 3 meters away from the kiln. Sprinkle a small amount of oil to ignite,
6. After confirming that the combustion is normal, when the furnace temperature is higher than 800 degrees, gradually inject pulverized coal and observe it to be normal.
7. Before igniting the drying kiln, open the damper of the main fan.
8. When the temperature at the kiln tail reaches 200 degrees, the kiln starts to rotate intermittently and turns to 1/3 every 2 hours.
9 When the temperature at the kiln tail reaches 350 degrees, open the cold air valve before dust removal for cold air distribution, and ensure that the temperature at the dust removal inlet is less than 200 degrees.
10. When the kiln temperature at the end of the rotary kiln reaches 450 degrees, start to control the level of magnesium oxide in the preheater silo, and automatically stop feeding after reaching the level.
1 1. When the kiln end reaches 600 degrees, the hydraulic push rod starts to feed intermittently. Start intermittent kiln rotation, every 1 hour 1/3.
12. When the kiln end temperature reaches 600 degrees, the hydraulic push rod starts to feed intermittently. In order to give consideration to the quality of the drying kiln of the cooler, the material drying kiln is adopted.
13. When the temperature at the kiln tail reaches 700 degrees, the kiln starts to rotate continuously at a speed of 0.33 rpm.
14. When the temperature at the kiln end reaches 800 degrees, use a push rod to start feeding every 90 seconds and start dust removal. At this time, the kiln is completed and put into production according to the normal operation method.
15. After the kiln is started, the temperature of the kiln shall be measured and recorded every 65438 0 hours, and recorded on the pre-drawn kiln curve.