What are the special working conditions of lime kilns
In the production process of lime kilns, in addition to the normal operating conditions, there are also various special working conditions that require special attention, which pose challenges to equipment safety and product quality. The following are the main types of special operating conditions and their characteristics:
1. Abnormal working conditions of raw materials
(1) High sulfur raw material operating conditions: When the sulfur content of limestone is greater than 1.5%, it is easy to cause excessive SO ₂ in kiln gas and corrosion of refractory materials
(2) Fine powder working condition: When the proportion of fine materials<30mm exceeds 20%, it will cause an increase in ventilation resistance inside the kiln
(3) High magnesium raw material operating conditions: Raw materials with MgO content>5% need to adjust the calcination temperature curve
2. Abnormal operating conditions of the equipment
(1) Partial kiln operation: manifested as abnormal temperature rise on one side of the kiln body (temperature difference>150 ℃)
(2) Ring forming condition: When the thickness of the kiln wall ring is greater than 300mm, it significantly affects heat conduction
(3) Unloading failure: The ash unloader is stuck or the speed is abnormal, causing material accumulation in the kiln
3. Abnormal environmental conditions
(1) Extreme weather: Environmental temperature<-15 ℃ or>40 ℃ affects equipment operation efficiency
(2) High humidity conditions: Air humidity greater than 85% leads to a 20% -30% decrease in combustion efficiency
(3) Grid fluctuation: Voltage fluctuation exceeding ± 10% affects motor control system
4. Production transition conditions
(1) Ignition heating stage: Strictly control the heating rate (50 ℃/h) from room temperature to working temperature
(2) During the kiln shutdown insulation stage, it is necessary to maintain an insulation temperature of 300-500 ℃ to prevent damage to refractory materials
(3) Load adjustment stage: the adjustment period when the output fluctuation exceeds the design value ± 30%
For these special working conditions, it is recommended to establish a specialized emergency plan, equip it with an online monitoring system for real-time warning, and conduct regular simulation exercises. By scientifically managing special working conditions, unplanned downtime can be reduced by over 40%, significantly improving production stability.
