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What is supercritical boiler?

The following extract taken from an article by Ingo Paul in Energy Issues No 19 April 1999 published by the World Bank [external link] briefly describes the difference between a subcritical and a supercritical boiler. "Supercritical" is a thermodynamic expression describing the state of a substance where there is no clear distinction between the liquid and the gaseous phase (i.e. they are a homogenous fluid). Water reaches this state at a pressure above 22.1 megapascals (MPa) The "efficiency" of the thermodynamic process of a coal fired power (sic) describes how much of the energy fed into the cycle is converted into electrical energy. The greater the output of electrical energy for a given amount of energy input, the higher the efficiency. If the energy input to the cycle is kept constant, the output can be increased by selecting elevated pressures and temperatures for the water-steam cycle. Up to an operating pressure of around 19 MPa in the evaporator part of the boiler, the cycle is sub-critical. This means, that there is a non-homogeneous mixture of water and steam in the evaporator part of the boiler. In this case a drum-type boiler is used because the steam needs to be separated from water in the drum of the boiler before it is superheated and led into the turbine. Above an operating pressure of 22.1 MPa in the evaporator part of the boiler, the cycle is supercritical. The cycle medium is a single phase fluid with homogeneous properties and there is no need to separate steam from water in a drum. Once-through boilers are therefore used in supercritical cycles. www.whizkris.com


What is the difference between a regular memory card and an Ultra Memory card.?

What is the difference between a regular memory card and an Ultra Memory card


What is the basic difference bw nokia ultra and flexi bts?

the basic difference between nokia ultra&flexibts is that ultra can support only12 trx but flexi bts can support 24 trx. i


Difference between substansive ultra vires and procedurial ultra vires?

they are both aload of wank and a waste of time ! hope this helps :)


What is an registered vascular ultra sound tech?

What classes are different between a vascular ultra sound tech and an x ray tech? What is the pay difference?


What is the Difference between ultra sonic and super sonic?

one changes colors and one doesn't


What is the difference between a 50 caliber and a 375 ultra mag bullet?

Size and amount of propellant


What is the difference between Sandisk micro sd and mobile ultra micro sd?

I want to know


What is the difference between ultra sonic and infrasonic sound?

sound waves with frequencies 20 hertz or lower are infrasonic and waves above 20,000hertz are ultra sonic!


What is Ultra Supercritical Power Plant?

· Ultra-super critical coal based thermal power plants.· Efficiency range 45-48%· Usage of coal per unit of electricity produced around 288 grams.· Pollution level complies with United Nations CDM (Clean Development Mechanism) standards.· 1000 MW unit size or more.it steam temperatures above 600 degrees Celsius and pressures around 27 mega pascal. {Ultra-supercritical units ( 25- 30MPa/600/600℃:/43%to46% }


What is the difference between ultra chi and chi?

nothing! the only thing is that the ultra chi comes in various colors and the chi is in black. also, the regular chi is the first one to come out so its less advanced than the ultra and the ultra comes with tourmaline plates which is less damaging to your hair aswell.


What is Difference between 7MM mag and 7MM ultra mag?

Basically the case is all. Same caliber bullet, but the case is shorter in the ultra mag. Its basically just a smaller round, bigger punch.