Category Archives for Instrumentation and Control

Simplified Diagram for a Fired Heater with an Air Preheater and Forced and Induced Draft Fans

02. May 2018 by sam
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Simplified Control Diagram for a Forced Draft Heater

02. May 2018 by sam
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Simplified Control Diagram for a Natural Draft Heater

02. May 2018 by sam
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Safety Checklist

Consider the following when designing a fired heater control and protection system: (See the appropriate section of this manual for additional information.) • Blinds on all fuel oil and fuel gas lines to or from the heater, including any fuel … Continue reading

02. May 2018 by sam
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Protective Instrumentation and Shutdown Devices – Low Charge Flow

Safe operation also requires process flow through all tubes. Loss of flow through a tube: • Will lead to rapid overheating and rupture of the tube • Needs all fuel, including that for minimum fires, to be shut off automatically … Continue reading

02. May 2018 by sam
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Protective Instrumentation and Shutdown Devices – High Fuel Pressure

Firebox installations must be designed to minimize the probability of flame failure. • For gas burners this is done by installing reliable fuel systems and reliable minimum-fire bypasses. • For oil burners this is done by installing reliable oil systems … Continue reading

02. May 2018 by sam
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Protective Instrumentation and Shutdown Devices – Low Oil Pressure

Oil should be fired through combination burners that have a minimum-fire gas flame at each burner firing oil. Then automatic shutdown on low oil pressure is not needed because of the reliable gas flames at each burner.

02. May 2018 by sam
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Complex Combustion-Air/Flue-Gas Systems

This section uses the example of NOx technology to illustrate fundamental concepts. Figure 600-4 is a typical schematic for a natural draft firebox. The flue gas from one or more radiant sections flows through a convection section and then up … Continue reading

02. May 2018 by sam
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Fuel Oil Firing – Viscosity Control

High pour point fuel oils need viscosity control, more so for some types of burners than for others. Viscosity can be controlled by regulating the oil temperature close to the pump discharge. Or a continuous viscometer can be used to … Continue reading

02. May 2018 by sam
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Fuel Oil Firing – Pressure Control

If a fuel oil system feeds more than one firing control valve, then load changes on one firebox should have an acceptably small effect on the other firing valves. For very small systems this may need only a supply pump … Continue reading

02. May 2018 by sam
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