efficiency & combustion controls by john devine€¦ · blowdown losses 3% 100psi 338of steam...
TRANSCRIPT
![Page 1: Efficiency & Combustion Controls by John Devine€¦ · Blowdown Losses 3% 100PSI 338oF Steam 8532 lbs/hr . 383oF Flue Gas Losses 18% Feed Water 60oF Efficiency 75% Other Losses 2%](https://reader034.vdocument.in/reader034/viewer/2022051410/602c0f677ad600134f7d3a36/html5/thumbnails/1.jpg)
Energy Efficiency & Combustion
Controls by
John Devine
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“Minimum running costs are achieved by running boilers at high thermal efficiency”
Energy Savings
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• Boiler efficiency can be increased by 1% for each 15% reduction in excess air or 40o F reduction in stack gas temperature.
Energy Savings
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Blowdown Losses 3%
100PSI 338oF Steam 8532 lbs/hr
383oF Flue Gas Losses 18%
Feed Water 60oF
Efficiency 75%
Other Losses 2%
Radiation Losses 2%
Typical Losses
Typical Boiler
![Page 5: Efficiency & Combustion Controls by John Devine€¦ · Blowdown Losses 3% 100PSI 338oF Steam 8532 lbs/hr . 383oF Flue Gas Losses 18% Feed Water 60oF Efficiency 75% Other Losses 2%](https://reader034.vdocument.in/reader034/viewer/2022051410/602c0f677ad600134f7d3a36/html5/thumbnails/5.jpg)
The Golden Numbers
• Parallel Positioning - open loop – 3-5%
• O2 Trim closed loop - 1 - 2%
• Variable Speed Drive - 40% electrical, 0.5% turndown
• Lead Lag Sequencing - 1 - 3%
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Single Point Positioning
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Parallel Positioning
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Two CB Hot Water Boilers
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New Panel Insert
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Air & Fuel Servos
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VFD
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• Increased Turndown: 1.0% (The independent light off position and use of VFD both provide a real opportunity to increase the possible turndown on the boiler). (Increasing turndown has a marked impact on boiler cycling).
Savings Broken Down
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O2 Probe
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• O2 Trim: 1 -2 % (Compensates for changes in temperature, barometric conditions, air density, fuel pressure etc that can affect combustion repeatability)
Savings Broken Down
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* WEISHAUPT Germany
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* WEISHAUPT Germany
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Two 600 HP Low Pressure Steam Boilers
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Four Dual Fuel Burners
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Boston School’s Natural Gas, VFD, O2 Trim