hottest hot fluid meets

07:22 Jan 2, 2003 

- Headers: Collect the working fluid (water or steam) from the tubes of a bank.
- Counter-flow: When the hottest hot fluid meets the hottest cold fluid.
- Parallel flow: When the hottest hot fluid meets the coolest cold fluid.
- Natural circulation: No pump is used to assist water/steam mixture circulation inside boiler circuits.
- Pressurized furnace: A forced draft fan provides positive pressure inside the furnace (and in all air and flue-gas circuits).

07:20 Jan 2, 2003 

Basic definitions

- Generating Bank: This is the bundle of tubes connecting both drums.
- Generating bank side walls: This are the right and left walls at the sides of the generating bank.
- Generating bank rear wall: This is the wall at the back of the generating bank.
- Generating bank baffle wall: This is the internal vertical division in the generating bank.
- Superheater bank: This is the bundle of tubes in the upper, rearmost part of the furnace just before the generating bank. It is composed of two stages.
- Primary superheater: This is the stage at the rear, closer to the generating bank.
- Secondary superheater: This is the stage at the front.
- Superheater cavity: This is the envelope of superheater, limited by part of the furnace side walls and roof, the nose, the superheater screen and the generating bank.
- Nose: This is the sloped wall separating the furnace from the superheater cavity.
- Superheater screen: This is the vertical set of tubes between the furnace and the superheater.
- Supplies: Set of tubes under the furnace floor, connecting the lower drum to the furnace lower side wall headers.
- Risers: Set of tubes over the furnace roof, connecting the furnace upper side wall headers to the steam drum.
- Bank or coil: It is a bundle of homogeneous tubes used for the same service.
- Tube rows: Rows of tubes are considered in direction of gas flow.
- Tube sections. Transverse sections are considered perpendicular to the gas flow

07:04 Jan 2, 2003 

06:53 Jan 2, 2003