1.         Feedwater Pump and Prime Mover

The feedwater pump is normally a positive displacement pump to provide the necessary feedwater pressure and flow rate required for the generator.

2.         Feedwater Preheater

This is normally a double pipe hair pin type heat exchanger used to raise the feedwater temperature above the flue gas dew point to prevent condensation of water in the flue gas and the resulting acid corrosion and deposits.

3.         Radiant Section

The radiant section is cylindrical with horizontal tubes transposed around the radiant section for equalized heat pick up. The tubes are supported with high alloy tube supports and are free to expand with temperature changes. The radiant section also provides large furnace volume for flexibility in combustion fuel and firing changes. The heat transfer surface in the radiant section normally picks up about 60% to 65% of the overall heat transfer duty. The refractory lined wall provides for reflective heat transfer to the tubes and insulation to reduce heat loss through the chamber wall.

4.         Convective Section

The convection section is fabricated from both bare and extended surface tubes. Flue gases from the radiant section enters the convective section flowing across the bare or shock tubes first and then across the extended surface tubes. The convective section normally picks up 35% of 40%, or more, of the overall heat transfer duty. These convective  sections are designed to give the desired efficiencies. Mechanically they are designed for easy tube replacement and maintenance. Side covers may be supplied with lay down doors for cleaning if desired.

5.         Burner

Burners may be supplied for natural gas, butane, propane, or liquid fuels.  Liquid fuels include crude oil. Heavy viscous oils need preheating to provide a viscosity at the burner of 100 to 150 SSU's at the burner nozzle.

6.         Controls

The feedwater flow rate is controlled by the generator discharge pressure. The burner firing rate is controlled by a metered flow rate signal. This allows the generator to be adjusted to give the desired steam discharge quality. Standard and optional safety limit devices allow unattended operation of the Generator. Certain limits are standard with annunciator lights to indicate reason of shutdown. Other limits are optional along with additional annunciator devices.