Hearth Monitoring, Tuyere Leak Detection, and Top Gas Analysis Systems
These systems were all implemented using Computer Products, Inc.'s RTP G2 MicroVAX (for I/O and database) interfaced to Control Systems International's VXL software package running on a VAX/VMS system (for calculations anddisplay generation). IPACT engineers were responsible for the entire system functionality, from configuring the G2 hardware and database to design of VXL screens to calculations within the VXL package.
The hearth monitoring system is used to support analysis of refractory condition in the hearth area. It monitors temperatures in the hearth area at various depths in the refractory and shell, as well as in the underhearth. The system then computes variable isotherms, and displays/alarms this information to operators via the VXL screens.
The tuyere system monitors supply and return cooling water flows to the furnace tuyeres. Leak values are digitally filtered and the filtered values subject to thresholding in order to separate actual tuyere leaks from noisy flow measurements. Flow and leak values are displayed to the operator on color graphic process mimic screens and stored in a historical database.
The top gas analysis system utilizes an above burden probe to monitor temperature and gas composition at various places across the diameter of the furnace top, as well as in the furnace skin. It then calculates gas utilization efficiency for the furnace, and displays this information to the operator.
Integrated Process Automation & Control Technologies