Key measures to improve the thermal efficiency of lime kilns
Improving the thermal efficiency of lime kilns is an important way to reduce production costs and achieve energy conservation and emission reduction. By optimizing production processes and equipment upgrades, the utilization rate of thermal energy can be significantly improved.
Fuel combustion optimization is the core link to improve thermal efficiency. Adopting graded air distribution technology, the combustion air is supplied in stages to ensure full combustion of fuel while reducing excess air coefficient. Installing an intelligent combustion control system to monitor the temperature distribution inside the kiln in real time and dynamically adjust the fuel and air ratio can improve combustion efficiency to over 92%. Select high-quality fuels with high calorific value and low ash content to reduce incomplete combustion losses.
The improvement of kiln structure has a significant impact on thermal efficiency. By installing heat exchange devices in the preheating zone and utilizing high-temperature flue gas to preheat limestone raw materials, 15-20% of the waste heat can be recovered. By using new composite refractory materials and strengthening the insulation of the kiln body, the heat loss of the kiln wall can be reduced by more than 30%. Optimize the aspect ratio of the kiln body, extend the residence time of materials, and ensure sufficient decomposition reaction.
The improvement of waste heat recovery system can significantly enhance energy utilization efficiency. Installing a tubular heat exchanger to recover 300-500 ℃ flue gas waste heat for preheating combustion air or drying raw materials can increase the overall thermal efficiency by 8-12%. Some enterprises use waste heat boilers to generate steam and achieve energy cascade utilization. The comprehensive application of these measures can increase the thermal efficiency of lime kilns from the traditional 65% to around 80%, with significant energy-saving effects.
