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Thermal power plant

Monday, October 02, 2017   By: kamlesh kumar [2186] 0 Stars
Sir,I have a doubt that why main steam temperature will be high if eco inlet temperature is low and vice-versa.kindly comment.

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Thursday, October 05, 2017   By: Jim Watts [764] 5 Stars
For this explanation we a talking about a simple boiler with a superheater and an economiser at a steady steam flow.

The steam temperature is determined by the steam flowing through the tubes and the heat on the outside of the tubes.

If the economiser is fed with colder water the firing must increase to keep the same steam flow. As the superheater steam flow inside the tubes is the same but the heat outside is more the temperature goes up.
For hoter feed water the firing goes down while the steam flow is the same so it cools down

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Saturday, October 07, 2017   By: kamlesh kumar [2186] 0 Stars
Thanks a lot sir for your response,but I think colder economizer inlet feed water would extract more sensible heat from economizer,which will increase the boiler efficiency.Is it true in that case that boiler need to increase fuel firing to meet same steam flow,kindly comment.


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Saturday, October 07, 2017   By: Jim Watts [764] 5 Stars
If colder water is sent to boiler more heat must be added to maintain output.
This increases the superheat temperature.

It is also true that the flue gas temperature will fall and the boiler efficiency has increased. this means the extra fuel will be burnt more efficiently but there will still be extra.

If feeding cold water to a boiler ever reduced the amount of fuel required we would fix climate change problem.

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VWO, BMCR, TMCR, Full Load and Base Load
By: Jim Watts [764]

MCR is maximum continuous rating.

BMCR is the Boiler MCR, TMCR is the turbine MCR

VWO is valves wide open and at normal pressure allows the turbine to exceed TMCR by 5-10 percent

Full load is not fixed but means the turbine has reached it intended maximum

Base Load is also a flexible number and means the turbine will not be operated below that figure. It is mostly used in power system scheduling where the cheapest plants run fully loaded and are referred to as base load plants. O....   Read All
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