Total Water Consumption for 150Mw Thermal Power Station

Anything from not much to quite a lot depending upon how the resource were managed.

• Where is the raw water composition analysis?
• Where are the discharge consent limits?
• What is the steam make-up water composition to be?
• What is the ambient temperature and humidity?

Depends on the design, location, and maintenance of the plant. You might even find some designs where the workers consume more water than the thermal plant. If this is a fossil fuel thermal plant you could produce more water vapor from combustion than consumed by the workers.

Steam pressure? (Low-Medium-or - high pressure? Critical? Super-critical?)

In addition to the above you are missing a lot of information that is required before anyone could venture a guess.

The amount of information will be far greater than what you could/should post in this forum.

If the plant exists you should be able to contact the design engineering firm or review the plant design DATA to find the information.

If this is a plant in development stage, you will need to contact the design team lead engineer.

If you are going to attempt to design the plant, you will need a fully staffed team of experts.

A lot less than with a plant using a cooling tower. But since you are air-cooling, it takes more (~16% MWthermal more to produce max load in MWe) heat (and steam) to produce that 150 MW. I am guessing your steam flow is maxed out at 600,000.

With 3% losses incidental (packing, valves, glands, small leaks, etc.) you need a 32 gpm water system. With a 6 hour warm-up/start-up at 10% steam rate (vented), you need a lot more (43, 165 gallons/start by WAG method). You should allow your unit only one full startup per day, but add another 15,000 gallons loss during shut-down for any venting that must take place. Now are looking at a grand total daily to operate of 104,245 gallons/day (73 gpm). So you opt for a 100 gpm water treatment system to purify make-up condensate, and install a minimum tank size of ~3x daily use of 1 acre foot (1233 m³).

It is rare that I reply to my own post, but I must admit an error was made in my assumption about the OP's plant. I had stated a maximum steam flow of 600,000. That might be close for a 60 MWe plant. Correct value is nearer to 1,500,000 lbs/hr steam flow. This will necessarily upgrade the size of water treament equipment to around 250 gpm, along with a needed increase in size of condensate storage tanks, to cover start-ups and shut-downs, to a minimum of 3000 m³ (~1MMgallon).

For air cooled condenser in 150 MW power plant, water is required for compressors and vacuum system apart from boiler. Water required for steam generation depends on efficiency of boilers. As a thumb rule for compressors and vacuum system, one requires 15 m3/h make up water in standard cooling towers with < 0.1% drift losses. Hope this is okay.

Vikram Shah

Expert- water treatment, recycle and water conservation

James,

No need to guess, a study by the Central Electricity Authority (CEA), New Delhi concluded that a dry air condenser system would reduce water consumption to 1/5 to 1/6th that of a "normal" water cooled system, from 3.0 to 0.55 M³/Hr/MW, based on a study of 2x500MW plants; or from 450M³/Hr down to 82.5M³/Hr.

They also concluded that the "hits" that efficiency and heat rate take (approx. 7%) made this only viable when the plant was located in an area with very scarce available water resources.

RAM

Yes, thanks, I was just throwing out some WAG numbers without doing a lot of research on it, sorry. Still seems like a lot, and there will be large variations depending on start-up frequency, reliability,etc.