Meaning of underfiring | Babel Free

Definitions

1. Intentional operation of a boiler, furnace, oven, etc., at a low level.
   uncountable
2. The state of not burning fuel at the desired level, and thus not providing heat efficiently.
   uncountable
3. Heating from below.
   also, attributive, uncountable
4. The state of being insufficiently fired or underfired.
   uncountable

Examples

“The designer believes that by this combination of a combustion-chamber with the underfiring grate the combustion of the fuel is improved.”

“Underfiring of steam boilers, though not approved in this country, is very largely practised in America, […]”

“The lowered demand for coke during the depression, the necessity of maintaining the gas output and the ready availability of liquefied petroleum gas for underfiring led to the conversion of the North Shore coke plant of Becker ovens at Waukegan, Illinois, to this fuel. […] The thermal efficiency of the underfiring was about five per cent lower and somewhat more attention was required to keep the ovens in balance.”

“One of the major factors contributing to high particulate emissions from domestic burners is on-off cycling. […] Modulation and underfiring have been suggested as methods of reducing the significance of the startup transient. […] Underfiring consists of using a smaller (undersized) unit which has to stay on longer and, therefore, cycles less.”

“A steam temperature transient correction is a signal that is applied to the normal steam temperature control strategy to counter the impact of a transient process change. An example of a transient process change, and the most typical, would be overfiring or underfiring. Overfiring and underfiring are considered transients because they are not required to maintain a steady-state condition.”

“In natural gas-fired boilers, gas pressure is critical to proper burner operation and efficient combustion. Variations in gas pressure may cause over- or underfiring of the boiler. […] Underfiring may cause flame instability and poor combustion efficiency due to high levels of excess air.”

“Gas-burner maintenance should include these measures: […] Adjust gas input if combustion testing indicates overfiring or underfiring.”

“Damaged or clogged oil piping between the tank and the furnace will result in reduced fuel flow to the burner. This can cause burner underfiring, which is identified by: / Reduced heating capacity / High oxygen readings during combustion test / Low stack or flue temperature / Low temperature rise (temperature differential) across the heat exchanger […]”

“[W]hile there were fully as many under-firing as tube-firing boilers, at work, the majority of explosions took place in boilers of the latter class, and they almost invariably commenced with the collapse of the fire flue.”

“In an underjet coke oven, a distribution system for delivering a combustion-medium into the underfiring system of said coke oven, comprising: a header-pipe having a plurality of outlets therealong; pipe-connections at a region so remote from the active combustion zone of the underfiring system of the oven as to be unaffected by the heat of active combustion in the combustion zone, for delivering said combustion-medium from said header-pipe outlets to different points in conduit means of said coke-oven underfiring system; […]”

“Convert liquid heaters from underfiring to immersion or submersion heating”

“The piers should be a minimum of 8″ high (0.2 m) so that underfiring can be used to heat the pieces from below (and traditional overfiring to heat from above).”

“Hence it is, I must suppose, that while more effects could be produced with rose if one could only be sure of the fire, yet carmine is the more serviceable, as one is at so much less risk of loss from overfiring, which is more common than underfiring.”

“The brick color which you describe as the result of your carmine after firing is generally due to underfiring and a second fire, stronger, will remedy this, but if this is caused by the painting either laid on too thick or spoiled by other colors, there is no remedy.”

“After either underfiring (4 minutes at 1,450° F), normal firing (4 minutes at 1,575° F), or overfiring (6 minutes at 1,750° F), the specimens were deenameled with molten sodium hydroxide.”

“Underfiring results when the kiln doesn't reach the cone temperature at which your glaze matures. Underfiring can be caused by improper calibration of kiln sitters or computer controllers, firing a kiln too quickly so that not enough time is allowed for the glazes to develop properly, or by kiln elements that are worn and need to be replaced.”

“Other problems are caused by underfiring or overfiring the glaze. Underfiring, when the kiln doesn't reach the correct temperature for the glaze, can cause pinholes, while overfiring when the kiln is too hot, can cause the glaze to run, resulting in blisters in the glaze.”

CEFR level