Waterwall

The use of such tempering air has diminished greatly with the shift from refractory to waterwall incinerator construction.

Source: wiktionary

One important industrial example involving this phenomenon is the circumferential cracking that occurs on the waterwall tubes of some supercritical coal-fired boilers, which are fired under low NOₓ combustion conditions.

Source: wiktionary

The water is heated to a steam-water mixture in the waterwall tubes of the radiant section, and the wet steam rises to the upper drum.

Source: wiktionary

For greater heights, an interrupted sheet, spouts, a waterwall, or a cascade will provide a display of equal or greater visibility while affording considerable energy savings, less splash, greater wind stability, and a sound quality more appropriate to confined or interior spaces.

Source: wiktionary