Hydrogen Energy Systems

A: Skipping this step risks energizing the stack with blind gas detection, which is how you end up with an energized hydrogen source and no automatic isolation. Proving the H₂ detectors into the PLC and confirming trip logic works is a prerequisite before any electrical energization, even without electrolyte. The other actions are valid, but they either belong earlier chemical readiness or later functional testing stages and don't protect against immediate loss of containment during first power-up.

A: Picking the wrong alloy here leads to rapid high‑temperature hydrogen attack, loss of creep strength, and tube rupture inside the firebox. Reformer tubes sit far above the safe envelope for carbon or low‑alloy steels on the Nelson curves, and austenitic stainless doesn't carry the creep load at 900 °C. Purpose‑designed high‑Ni cast alloys are engineered for carburization resistance, creep life, and H₂ service in fired reformers.

A: Chasing flow without addressing purity risks flame lift-off and refractory damage inside the ATR burner tile. Nitrogen dilution hits flame stability before it shows up as a clean conversion loss, and increasing O₂ flow just worsens hot spots. Reducing load and restoring oxidant quality keeps combustion anchored and avoids irreversible burner and catalyst damage.

A: Ignoring this trend ends with accelerated efficiency loss and premature stack end‑of‑life, even though product quality still looks fine. Rising voltage at fixed current points to higher ohmic losses, which aligns with membrane degradation rather than catalyst poisoning or downstream purification issues. Electrical supply problems show up as instability, not a smooth voltage creep.