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Posted by Dana Coe on September 24, 2008 at 10:53:29:
In Reply to: Re: 55MW power plant: 240 T/hr or 75 T/hr steam? posted by Boiler Guy on September 24, 2008 at 10:33:54:
The requested spec from the customer -
"240 Tons per Hour, 93.8 Kscg, 530+ - 5 degree C at super heater outlet, single drum, natural circ., balanced draft, two pass boiler using Blast Furnace gas (775Kcal/NM3) / Furnace oil / CWM (Coal Water Mixture) as fuel."
His calculations are -
Specific steam consumption calculations
Cycle heat rate = Plant heat rate x Boiler efficiency
= 3037 x .89 = 2702.93
= Main steam flow (Enthalpy of Steam at turbine inlet-Enthalpy of feed Water)
= X ( 824-200)/55
Hence X = 2702.93x55/624
= 238 T/hr
Specific steam consumption = 238/55 =4.32 T/hr
: For starters what is the steam pressure, temperature, turbine type and eficiency, condensing assumed?
: Boiler Guy
: : I have a customer from India, wants to buy boilers for a 2 x 55MW electric plant. His calculations say they need 240 T/hr boilers, wear-as the Chinese boiler manufacturer swears 75 T/hr is fine.
: : What gives? They both agree the price is about right, and the physical size, but somehow the tons of steam per hour is not the same.
: : Anybody know what I'm missing here?
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