It is known that the rotary kiln refers to rotating calcining kiln (commonly known Xuanyao), belongs to the class of building materials equipment. According to different materials, Rotary kiln can be divided into cement kiln, metallurgy chemical kiln and lime kiln. The cement kiln is mainly used for calcining cement clinker in cement kilns, which can be divided into dry and wet process cement kiln these two categories, Metallurgy chemical kiln is mainly used in metallurgical industry, steel plants depleted iron ore magnetic roasting; oxidizing roasting of chrome, nickel, iron; the Refractory Plant roasting high alumina of vanadium bauxite and aluminum hydroxide, aluminum roasting clinker; chemical plant baking chrome ore and chromium ore and other minerals. Lime kiln for roasting (ie, active lime kiln) steel plant, ferroalloy plant with active lime and light burned dolomite. Ignition is the first step of the fired rotary kiln system production, whether in the operation of the new production line, or the maintenance of machinery in production process, lining replacement or trouble parking, the ignition operation are all required to carry out, that is the initial coal combustion injection. The following briefly describes the rotary kiln ignition notation: 1 First start the kiln inlet exhaust main machine, adjust the air intake valve, pull the kiln and piping system wind about 5 minutes, reduce the concentration of carbon monoxide in the kiln system, makes it full of fresh air, while close the kiln inlet access doors. 2 before rotary kiln ignition spraying, we need to adjust the pulverized coal burner position and status, the distance between the general coal injection nozzle and the kiln mouth is about 0.5 m, we also need to adjust the coal burner channel interface to the relatively larger, make the starting early and smooth soft flame, the fire was concentrated, so the pulverized coal devices’radio easily.
3 before the ignition, we should be sure to open the appropriate degree of the preheater ignition breathing apparatus. It is best to get the central control for the convenience of adjusting .but due to the preheater, temperature is high, kiln pumping force is large, which is adverse to the early coal combustion, so we need to control the kiln wind speed by depressing breathing apparatus. 4 spray pulverized coal before the on – site testing, this is mainly to ensure the smooth flow of pulverized coal injection piping system, the pulverized coal scales Gongmei control is reliable. The test spray time should not be too long, about 2 minutes, but we should contact with the on – site staff timely, stopping spraying immediately after confirming the coal powder.