Question 210Steam Plants - 1st Asst/Chief70% to pass
In the boiler shown in the illustration, the arrow "E" indicates a ________________. Illustration SG-0008
AI Explanation
The correct answer is C) downcomer.
In a boiler, the downcomer is a tube or pipe that carries the cooler, denser water from the steam drum to the bottom of the boiler, where it can be recirculated back up through the water walls or tubes to be heated and turned into steam. The arrow labeled "E" in the illustration SG-0008 is pointing to a downcomer, which is responsible for ensuring proper water circulation within the boiler.
The other answer choices are incorrect because they do not accurately describe the component indicated by the arrow. A support tube is a structural element, a recirculating tube is used for water recirculation but not specifically a downcomer, and a water wall tube is part of the heating surface of the boiler, not the water circulation system.
Related Questions
#208 The major heat loss in an oil fired boiler is the heat _______________.#209 A high carbon monoxide content in the flue gases of a boiler indicates _______________.#211 One advantage of installing water wall tubes in a boiler furnace is to _______________.#212 In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because _______________.#213 Which area shown in the illustration will offer the most resistance to heat transfer from the fireside to the waterside of a boiler tube? Illustration SG-0017