Auto-combustion incinerators are preheated with biomass (wood, dung, other) for about 30mn, and then rely on the operator to keep temperatures in bounds (600-900 deg C) by knowing when to load what for 3 hrs, and then finish with a 30mn biomass burn-down period.
• Biomass is used to get the system preheated to 650+ deg C
• Plastics raise the temperature of the system, and are thus "the fuel" [load at 625 deg C when temps are falling]
• Non-sharp infectious waste and pathological waste lower the temperature of the system, and are thus "the real waste" [load at 800 deg C when temps are rising]
• Biomass is used to burn off remaining waste at the end of operation while keeping operating temps above 600+ deg C
Teaching operators to perform in a short 3-day training time window after systems are installed is a challenge.
• On day 1, PRIMER: before the incinerator is built, an introduction to operation is conducted using props for the incinerator, a safety box, biomass, non-sharp infectious waste and pathological waste. The instructor plays the temperature gauge calling out readings, a student pretends to be the fire and reacts to what the trainee loads, and the trainee loads waste in response to both the temperature call-outs and the behavior of the fire.
• On day 2, TRAINING: the trainer micromanages operation of the Incinerator, explaining continuously how, what, why, when and so on.
• On day 3, COACHING: the trainer takes the essential decision criteria for next step in correct operation, and equates them to hand signals.
Hand signals are effective in that the operator doesn't have to spend time trying understand what is being said. Concepts are explained once, practiced heavily with repetition on Days 1 and 2, and clearly understood as principles -- and after that, the hand signals serve as prompts to improve upon performance.
The set is as follows:
And here is a short video clip of using these hand signals (Check Temperature, Pick up waste, Load Waste) to coach WDU auto-combustion incinerator operators in Liberia.
[youtube]ZndPZdquxTo[/youtube]
I used to coach skydiving and that was my inspiration for the use of hand signals for real time auto-combustion incinerator coaching. Here's a subset of hand signals used at Elsinore Drop Zone in California -- but each school has their own variants.
http://www.skydiveelsinore.com/jumpstart/handsignals.html
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