Due to the modification of the process line, our company's two 155kW Roots blowers were changed from feeding raw materials into the kiln of the original 1000t/d production line to be used for raw material homogenization and discharge into the kiln of the 1500t/d production line. This resulted in significant overcapacity. To address this issue, we comprehensively analyzed the existing production process of the two kilns and considered simplifying the process, reducing equipment control points, and lowering consumption, making full use of the existing equipment and achieving excellent results. 1 Introduction Our company currently has two cement production lines, sharing five Roots blowers for raw material discharge and silo blowing at the kiln tail. The usage is shown in Table 1. The main problem is that the R60 Roots blower, used for homogenization and discharge of raw material into the No. 1 raw material silo, has an excess air volume of 77.1 m³/min (117.1 m³/min - 40 m³/min). This excess air is wasted, resulting in significant noise pollution. The process system is also severely mismatched. Meanwhile, to ensure the normal operation of the No. 1 kiln system, only one JTS125 Roots blower is available, necessitating the purchase of a spare. Furthermore, the blower selection in the process design considers factors such as air leakage and system process changes; the air volume reserve coefficient is generally 1.15-1.3, and the air pressure reserve coefficient is generally 1.2-1.5. Therefore, the blower operates under low air volume and low air pressure conditions in actual operation, and does not need to be used at full load all the time, thus wasting a lot of electrical energy and material consumption, such as the consumption of damaged parts and replacements, and lubricating oil. [b][align=center]For more details, please click: The Use of Frequency Converters in Roots Blowers[/align][/b]