Production of 700 C Steam

[AD_1979]

Dear all,

Due to an application we need to organize in one of our facilities, we need to deal with the production of a quantity of around 500 kg/h of a really high temperature steam (Around 700 C). Is there any way of doing this? I can get steam up to 450 C....but I cannot find any alternative / technology for getting this extra boost of temperature.

Your help is really appreciated.

Regards,
AD

 

[goutam_freelance]

Yes, this may be possible. The main constraint is temperature resistant material.

ASME codes allow temperatures up to 1200 deg F(649 deg C) for code approved piping material. However, advanced ultra supercritical power plant technology will achieve up to 700 deg C steam temperature. However, special approval from ASME be required for using these materials.

 

[georgeverghese]

700degC at what pressure ?

 

[AD_1979]

700degC at what pressure ?

Around 2 bar.g

For such low pressures, I saw that there are some systems able to produce steam at such temperature, but the problem is they are electrically driven. I am trying to find some technology driven directly by heat produced by fuel and residual heat in our process.

 

[georgeverghese]

Exhaust gas from the radiant section of a typical fired heater is > 800degC , so 700degC superheated steam should be possible. Speak to some fired heater manufacturers in your area and see if they can make something for this low 500kg/hr steam rate. It may be much more expensive than an electrical heater element driven superheater, so see if this increased cost can be recovered in say 5years or so with the cheaper fuel source you have available.