Power Plant Fly-Ash Hopper Auto-Ignition Prevention

01 The Problem

At Taipower's coal-fired plants, fly-ash hoppers sit under the precipitators collecting fine, hot ash. The hopper is a sealed pressure vessel — you cannot drill into it, you cannot put a probe inside, and the ash can smolder for hours before it self-ignites. When it does, the boiler tube above the hopper sometimes ruptures from the heat, and the whole plant goes dark.

The Risk

Fly-ash hoppers can self-ignite internally, but the hopper is a sealed pressure vessel — no drilling allowed for conventional thermal probes.

02 The OctosX Solution

Since the hopper is sealed, the only place to read the temperature is the outside wall. We bond a large-area Thermalpas sensor — about the size of a coaster — flat to the steel. Its high thermal conductivity lets it read what's happening inside through the wall. OctosX issues a yellow warning when the hopper climbs to within 30°C of the auto-ignition threshold.

Sensor & Edge

Thermalpas G-TYPE large-area sensor (100×100mm, thermal conductivity 1.5 W/mK) adheres to the hopper's outer wall, reading internal temperature via thermal conduction.

Cloud Logic & Alerting

OctosX Cloud issues a yellow alert 30°C before auto-ignition threshold.

03 The Outcome

At one Taipower thermal plant the system has run since 2021 — five years with zero auto-ignition events. The plant has been alerted twice on rising trends; both times maintenance opened the hopper during a planned outage, found localized heat zones, and cleared them. Each event avoided would have meant a 3-day shutdown plus boiler-tube repair.

Field Detection

Since installation in 2021, 5 years with zero ignition incidents.

Quantified Impact

A single fly-ash fire causing 3-day shutdown + boiler tube repair is conservatively estimated at $5M+ per incident — at least one major loss avoided over 5 years.

See it in your plant

Could this case be your plant?

Tell us about your facility — busbars, motors, panels, coal blowers, chillers, whatever your highest-risk thermal interface is — and we'll show you what an OctosX deployment would look like.

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