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Air vs. Steam Atomization Part 6 – Economics
Posted on September 7th, 2017 by David W. Spitzer, P.E. in Chemical Manufacturing Excellence
Previous posts discussed the incineration and atomization processes as related to air compressor capacity. It may seem that quite a bit of investigative work and thinking has been done without putting pencil to paper to determine if it makes economic sense to use air atomization instead of steam atomization. However, a number of economic issues have been bubbling just below the surface.
For example, atomizing with air reduces the mass flow through the incinerator as compared to atomizing with steam. Not only does this increase residence time and increase capacity (as previously stated), but it also reduces stack heat losses because the atomization air reduces combustion air by an equal amount as compared to atomizing with steam. This effectively eliminates the stack losses associated with the atomizing steam.
Plant air will be produced more efficiently when the compressor speed is reduced, because the compressor will continuously produce only the required plant air pressure and not the higher pressure produced when the existing compressor is loaded.
Atomization air can be substituted for steam on a mass basis – pound for pound. The amount of energy required to compress a pound of air is considerably less than the amount of energy required to boil a pound of water, so utilizing atomization air should be less expensive than atomizing with steam.
However, the question at hand is whether the efficiencies described above will offset the costs of the piping modifications, variable speed drive, associated controls and increased electrical energy consumption.
See previous posts:
- Air vs. Steam Atomization Part 1 – Sustainability
- Air vs. Steam Atomization Part 2 – The Incineration Process
- Air vs. Steam Atomization Part 3 – The Atomization Process
- Air vs. Steam Atomization Part 4 – Atomization Reliability
- Air vs. Steam Atomization Part 5 – Compressor Capacity
All opinions shared in this post are the author’s own.
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David W. Spitzer, P.E.
Principal at Spitzer and Boyes, LLC
- Air vs. Steam Atomization Part 12 – Holistic Approach to Project Approval
- Air vs. Steam Atomization Part 11 – Project Justification
- Air vs. Steam Atomization Part 10 – Economics (Capital Costs)
- Air vs. Steam Atomization Part 9 – Economics (Atomizing Air vs. Atomizing Steam Production)
- Air vs. Steam Atomization Part 8 – Economics (Plant Air Production)