Question 330Steam Plants - Assistant Engineer70% to pass
In a steam assist fuel oil atomizer, the steam pressure is higher than the oil pressure at _______________.
AI Explanation
The correct answer is C) minimum boiler load.
In a steam-assisted fuel oil atomizer, the steam pressure is higher than the oil pressure at minimum boiler load. This is because at low boiler loads, the oil flow rate is reduced, and the steam pressure needs to be higher to effectively atomize the thicker, more viscous oil. The higher steam pressure helps break up the oil into a fine mist, ensuring complete combustion.
The other options are incorrect because: A) design boiler load has a different steam-to-oil pressure relationship, B) high fuel viscosity would require even higher steam pressure, and D) low fuel viscosity would not necessitate higher steam pressure.
Related Questions
#328 Boilers equipped with steam atomizers can operate over a wide load range without cutting burners in and out because _______________.#329 In a steam assist atomizer, the fuel oil/steam mix takes place entirely within the _______________.#331 Compared to the return flow oil burner system, an internally mixed steam atomizer requires _______________.#332 The variable capacity pressure atomizing fuel oil burner functions to _______________.#333 In most installations, the firing rate of a boiler using steam atomization is indicated by the _______________.