ABB UVISOR MFD-SA Intelligent Flame Monitoring Control Unit

Description

In a large-scale thermal power plant, the boiler relies on dozens of burners to maintain steam pressure. The combustion environment is harsh, with fluctuating temperatures and varying coal quality often leading to unstable flames. A standard detector might misinterpret a momentary flicker as a flameout or, worse, mistake glowing refractory brick for a flame.

The ABB UVISOR MFD-SA solves this by acting as an intelligent filter. It continuously monitors the specific frequency of the flame signal from the burner scanners. If the MFD-SA detects that a burner has extinguished, it immediately sends a signal to the Distributed Control System (DCS) to cut off the fuel supply to that specific burner. This prevents raw fuel from accumulating in the furnace, which could lead to a catastrophic explosion upon re-ignition. By using the ABB UVISOR MFD-SA, the plant ensures that the boiler operates safely from startup to full load, minimizing the risk of “furnace puff” incidents.

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Technical Principles and Innovative Values

Microprocessor-Based Signal Processing: The ABB UVISOR MFD-SA moves beyond simple analog amplification. It uses a microprocessor to digitize and analyze flame signals. This allows the MFD-SA to apply complex algorithms that differentiate between the specific flicker frequency of a real flame and the steady radiation of hot background surfaces.

Programmable Band-Pass Filtering: One of the key innovations of the MFD-SA is its ability to filter noise. The unit features four selectable band-pass filter combinations. This allows engineers to tune the ABB UVISOR MFD-SA to ignore interference from welding, sunlight, or other burners, ensuring that only the target flame is monitored.

Continuous Self-Diagnosis: Safety is paramount in burner management. The MFD-SA constantly tests its own internal circuits, power supply, and sensor connections. If a fault is detected within the ABB UVISOR MFD-SA itself (such as a broken wire to the scanner), it forces the flame relay to de-energize, triggering a “fail-safe” shutdown to prevent unsafe operation.

Automatic Gain Control: The unit automatically adjusts signal amplification based on the flame intensity. This ensures that the MFD-SA can detect weak flames during startup just as reliably as strong flames at full load, providing consistent protection across the entire operating range of the boiler.