More steam please


produced in direct contact from its water source, same temperature and pressure as the water from which it was produced (check your steam tables) example: 615psig steam @489degrees F=saturated steam (saturated with water vapor, and very inefficient as steam goes). Now if you remove that steam from its water source and apply additional heat, you superheat the steam=less vapor entrained in the steam=greater efficiency in the device that uses it, (not to mention the advantages like less water impingement on the turbine blades, no boiler chemicals carried into the piping system, etc.) Most Navy ships now in service using fossil fueled boilers have superheat temperatures in the 850-950 degree F range. I retired as a senior boiler inspector in 1986. At that time there were only about a dozen or so ships (mostly reserve or specialty vessels) that still had 'M type' boilers whose superheat temperatures were seperately controlled through the use of superheater burners. All others were the 'D type' boilers whose superheat temperature was uncontrolled and a function of the firing rate of the boiler and the steam flow rate out the boiler. Does that clear some of it up?
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