Pressure Reduction Desuperheating Station 1

[dipak2]

Dear all experts..!!!

I have 11 MT/hr 500 C,90 barg Steam.That is converted into 30 Barg 240 C Steam.This is done by Pressure Reduction Control Valves (Pressure Controllers ) & By BFW injection that is by Temperature Controller(TC).I would like to convert energy in to Electricity Generation.

What will be investment,Saving Breif Calculations..

Thanks to all of you in advance.!!!!!

 

[TD2K]

I'd be inclined to look around the plant and see if there are any current electric motors that you could convert to steam turbine drives. That way, you don't have to buy an electrical generator, run cables, connect the generator into your electrical system, etc.

How steady is this let-down flow rate? If this is a peak flow and it's typically a lot less, that's going to affect your economics. I'm assuming you aren't going to get rid of your current let-down valves so you still have control of your steam levels when this turbine is out of service.

I don't have a feel for the capital cost of a steam turbine/generator set but you could get a budgetary cost fairly easy by contacting vendors by giving them the necessary information: steam flow, inlet and outlet pressures, inlet temperature, required generator production voltage, etc.

You can easily estimate how much power generation you are talking about. You know the steam flow and inlet/outlet conditions. The GPSA book has theoretical steam rates for turbines in it (lbs/Hphr) and and then adjust the power production ssuming 60% to 75% overall efficiency for the turbine/gen set in real life.

That will give you how much power you could generate and using your electricity costs to get a yearly savings. Depending on your company's payback requirement for new projects, you have an idea what the maximum capital cost can be to justify the project. When you get the budgetary prices back for the steam turbine/gen set, factor up an installed cost. That's likely to be signficant for something like this, at least 4x capital cost.

 

[SmartEngineer]

Depending in your steam balance configuration and arrangement, you can look for other alternatives if installing a generator is not justified for CAPX or OPX reasons.
Such alternatives are:
- Shift of some of HP steam users (e.g turbines, heat exchangers ..etc) to the higher level 90 barg & 500C
- You can pass the excess flow of the high level steam thru the users on 90 barg level (e.g thru extraction if there is a condensing-extraction turbine)
-If the source is reliable, and the power generated by a generator is high, you can utilize the generated power for better reliability (i.e. connecting some steam turbine users installed for reliability to this source of power to ensure better reliability and remove some of steam turbines provided for reliability purposes)


Try to think of saving the energy instead of wasting it thru letdown stations


Hope this would help

Cheers

SmartEngineer