Gaseous fuel firing in lime kilns
FCT Combustion applies jet excitation, a fluid dynamic singularity, in its Gyro-Therm® burner to promote increased mixing rates between gaseous fuels and oxidant in lime kilns. This technology is able to simultaneously reduce specific energy consumption, kiln inlet temperature and NOx emissions, while increasing production rates. By Joel Maia, FCT GmbH, Germany.
Figure 1: Gyro-Therm chamber diagram
Even if it is an oversimplified statement, it is commonly said that there are three “Ts” necessary for good combustion: temperature, time and turbulence. Especially in existing equipment there are often size limitations such that it is not possible to increase the residence time. There are also often materials operational temperature or emissions limits. Therefore, the focus of combustion efficiency advances has been on improving and controlling turbulence. In simple terms, improving and controlling the mixing rate between fuel and oxidant.
