This is the first time I am working with steam and I must build a line where I must generate steam at a temperature of 600C. My application requires low flow rates (4kg/h) and the dry steam must be introduced into my system at atmospheric pressure. Is it possible to generate superheated 600C steam at atmospheric pressure without major drops in the temperature? If so, how would be the pressure reduction along the line, I mean, what kind of valves should I use? Should pressure be reduced after the steam generator or after the superheater?

well i dont thimk its posible to have one without the other
its called steam enthalpy enthalpy = preasure and temperature combined however i will look into this for you.

For the very small flows you indicated, it sounds like you would probably use an electric boiler with an electric superheater.

For the final temp of 600 C, the best control would be to control the electric superheater heating element at 610-615C. The electic boiler and superheater would operate at about 1 bar gauge with a 0.8 bar pressure drop at the outlet pressure reducing valve.

The casing for the electric superheater could be ferritic SA335 P22 or P92 or a ferritic stainless steel ( can't use austenitic stainless if boiling water).

The safety relief valve on the unit would need to consider the max thermal duty the heater can generate, so it is prudent to deliberatley design the circuit breakers to limit this value to perhaps 125% expected max steam flow.

The temperature drop that occurs when steam is throttled from 2 bar a to 1 bar a is only 0.2 F ( 0.1 C), less than the accuracy of the thermocouples and control system.

The outlet valve would be a needle valve - for the flows you are considering, use a swagelock valve and tubing and fittings.

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