Kiln Inlet and Secondary Air Temperature Measurement for Cement Process Optimization

Kiln Inlet and Secondary Air Temperature Measurement is a critical part of cement kiln operation and process control. The kiln inlet is the area where the preheated raw meal enters the rotary kiln, while the secondary air—extracted from the clinker cooler—is introduced to support combustion in the kiln’s burning zone. Accurate temperature monitoring in these regions is essential for optimizing combustion efficiency, protecting refractory materials, and stabilizing the overall thermal profile of the kiln.

At the kiln inlet, temperature fluctuations can impact the thermal load on the refractory lining and affect the decomposition of raw materials. Reliable, real-time temperature data helps operators maintain consistent feed rates and prevent backflow of gases or overheating. Similarly, the secondary air temperature directly influences flame shape, fuel efficiency, and the quality of clinker formation. Maintaining optimal air temperature ensures better heat transfer and lowers specific fuel consumption.

Given the high dust load, radiant heat, and gas flow at these points, non-contact infrared pyrometers or specially designed fiber optic temperature sensors are recommended for accurate, long-term performance. These instruments provide robust readings even in harsh process conditions, contributing to energy savings and operational stability in modern cement manufacturing.