Cement manufacture requires a lot of gas flow. The grinding process of the raw material as well as the complete pyro section of the process are all based around the transport of limestone and cement, as well as the heat exchange and chemical reaction of the pulverised limestone and clinker.
A large portion of the total electrical energy consumed by a cement plant goes into fan power. Fans are also a key component when it comes to process control, whether it be raw mill gas flow or the control of the downcomer flow by ID fans. The most critical element, the gas flow itself, is rarely measured correctly. This has consequences starting beginning with incorrect operating points within the fan curve, via overdrafting of large pulverisers up to fluctuations in the pyro process because of swinging air and gas flows inside the process.
PROMECON has invented a new digital gas flow measurement system that does not need and delta pressure in order to measure gas velocity. The measurement is a vector-based time of flight measurement, which is 100% drift free and not sensitive to swirl in the gas. This enables easy measurement for the operators and can hence be used in the optimisation of the plant's control system in order to run the process more flat-lined and with lower energy consumption.
In this webinar, the measurement principle is explained in detail, as well as how it differs from any other conventional measurement principle. The presentation covers downcomer, raw mill, clinker cooler, bypass duct, tertiary air duct and finished product mill as examples. References are given from various sites, and details of the installation are also shared.
