DECISION GUIDE
Waste Heat Recovery Decision Guide: Is Your Plant a Fit?
Your thermal oxidizer generates significant heat that may offer an opportunity for power generation. This guide will help you quickly evaluate the potential for recovering that energy and converting it into usable power, using readily available plant operating data.
- Approximate data is fine
- Reviewed by a PCC engineer
- No cost to review
YOUR HEAT SOURCE
Five things that decide the answer.
You don’t need precise data to start. Approximate figures from your operators or your last stack test are enough for a first screen.
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Temperature
Thermal oxidizer exhaust at ~1,600°F and above is the strongest candidate. Other process exhaust at ~750–1,600°F is often viable.
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Continuous or batch
A source that runs continuously, or close to it, outperforms a batch process. Recovery equipment earns its keep by running.
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Flow and consistency
Higher, steadier flow means more recoverable energy and a simpler design. Big swings still can work, but they shape the pathway.
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What you vent today
Venting or flaring heat, making more steam than you use, or running an oxidizer with no heat capture are direct signs of an opportunity.
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A use for the energy
Recovered power or heat needs somewhere to go: your own load, a nearby process, or a realistic export path.
Approximate answers are fine. Even “not sure” counts.
PATHWAYS
Match your heat to the right pathway.
At oxidizer temperatures, you have more options than most plants. Final selection comes from a technical assessment of your actual stream.
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Steam Rankine
The primary path for oxidizer exhaust
At oxidizer temperatures, steam is usually the most efficient way to make power, especially at larger scale.
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Organic Rankine
Compact and quick to respond
Recovers heat too cool for steam, either downstream of a steam stage or on on its own for smaller streams where a full steam plant doesn’t pay. Holds its efficiency when heat output varies.
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Steam + ORC
Steam first, ORC on what’s left
A steam stage takes the high-grade heat, and an ORC stage recovers what remains downstream, capturing more of the stream than either alone.
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Direct heat reuse
Preheat, drying, process heat
Sometimes the answer isn’t power. When a thermal load sits nearby, reusing the heat directly can be the fastest path.
Is my plant a Fit?
Where your plant lands.
Not every plant is a good candidate today. Here’s how the strong ones and the not-yets usually look.
Likely a strong candidate:
- Exhaust at or near thermal oxidizer temperatures
- A source that runs continuously or close to it
- Steady exhaust flow
- A use for the power or heat, or a way to export it
- A budget cycle, turnaround, or expansion coming up
- Someone willing to sponsor an initial evaluation
Likely not a fit (yet):
- Heat below PCC’s recovery range
- Short, infrequent batch runs
- No practical use or export path for the energy
- Integration would put permit compliance or safety at risk
- Facing closure or major ownership uncertainty
“Not yet” is a real answer too.
If the right-hand list describes your plant today, that’s worth knowing before anyone spends engineering time. Plants change: an expansion, a turnaround, a new power contract. The opportunity will still be there when yours does, and so will we.
Self-Assessment
Put your plant through the screen.
Answer as best you can with what you have. “Not sure” is a fine answer. A PCC engineer reviews every submission and walks through a preliminary fit analysis with you.
- Approximate answers are fine
- Reviewed by an engineer, not a sales rep
- No cost for the preliminary analysis
- Your plant data stays confidential with PCC
If you answer “yes” to any of these questions – you may have a case for waste heat recovery.
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