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Safe Boiler Operation
 | Accurate, Repeatable Combustion Control - Fuel and air flows
are matched in order to maintain proper fuel to air ratio at all times,
too little air causes unburned fuel losses, too much air causes excessive
stack losses and improper fuel air ratio can be DANGEROUS. Any combustion
project requires the assessment of existing piping, burner and boiler
conditions, process measurements, analyzers, linkages, actuators, control
valves control dampers and operational requirements. Preferred's focus on
combustion applications, with over 1100 boiler control systems installed,
brings the required experience to the evaluation, development and
commissioning of each project.
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| Redundant non-volatile Memories and Service Manual Mode - The
PCC-III Controller is capable of "self recovery" in the event of a severe
120 Vac electrical power disturbance or some other phenomenon that alters
data in memory or otherwise confuses the microprocessor.
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| Optically Isolated RS-485 Data Highway - The PCC-III Controller
includes optically isolated communication to prevent a single controller
failure from disrupting an entire network.
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| Boiler Control Experience - Extensive boiler control experience
is the key to safe and reliable boiler control. Preferred's focus on
combustion applications, with over 1100 boiler control systems installed,
brings the required experience to the evaluation, development and
commissioning of each project.
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Decreased Flue Gas Emissions
| Ideal (stoichiometric) Combustion - Ideal combustion assumes
all fuel comes into contact with all oxygen. Practical, real world
limitations require extra air to assure that this happens. Too much excess
air will cause good combustion but low efficiency and increased NOx. |
| Various emissions are to be avoided - Particulate (opacity) and
carbon monoxide are caused from insufficient combustion of the carbon. NOx
emissions are caused by oxidation of the nitrogen in the fuel and air.
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| Ways to reduce emissions - Better mixing of the fuel and air to
reduce opacity and carbon monoxide while staged combustion and flue gas
recirculation are often used to reduce NOx. |
| Low Excess Air - Low excess air operation reduces both thermal
and fuel NOx by reducing the O2 available for combustion. |
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