On-line safety monitoring of explosive gas concentration for process in BF

The gas concentration of iron making process in blast furnace, such as CO, CO₂ and O₂, is very important to the energy usage efficiency and production safety, and the explosion will happen when the proportion of these gases concentration reaches the explosion limits, so we have to monitor the gas concentration on-line continuously to enhance the process reliability and safety. Here a gas analyzer based on the diode laser absorption spectroscopy technology was introduced, including the measurement principle and system configuration. Take the oxygen measurement as an example, the field data show that the response time of laser gas analyzer is less than one second and can meet the industry´s real time measuring and controlling requirements, and the alarm signal can trigger the feedback control actions in time to prevent gas explosion when the oxygen concentration increases too high by filling nitrogen as diluent gas. The application result proves that the laser gas analyzer based on the Diode Laser Absorption Spectroscopy can meet the requirements of safety monitoring and feedback control of process in BF.