How do supercritical boilers work?
Rather than boiling water to produce steam and then using that steam to turn a plant’s turbine, a supercritical boiler operates at such high pressure (3,208 psi/221.2 bar or above) that the fluid matrix in it ceases to be liquid or gas. Instead, it becomes what is known as a “supercritical fluid.”
What is the working principle of boiler?
Working Principle of Boiler Hot gases are produced by burning fuel in the furnace. These hot gases are made to come in contact with the water vessel where the heat transfer takes place between the water and the steam. Therefore, the basic principle of the boiler is to convert water into steam by using heat energy.
What is meant by supercritical type boiler?
Supercritical boiler (supercritical steam generator) is a type of boiler that works under supercritical pressure conditions. Temperature. Subcritical boilers are operated at temperatures up to 374°C. Supercritical boilers are operated at temperatures around 538–565°C. Pressure.
What is supercritical boiler and advantages?
For a given output, lower fuel consumption, and thus lower carbon emissions, than other less efficient systems. The load change rate capability of the system is not restricted by the turbine. Steam temperature at the inlet and outlet of the reheater is nearly constant over a wide load range.
What is the difference between slagging and fouling?
The word “slagging” is usually used to describe slagging in the furnace, whereas fouling is generally used to describe cinders or ash that have carried over into the convection pass and created flow obstructions due to the deposition.
What is Draught in boiler?
The difference between atmospheric pressure and the pressure existing in the furnace or flue gas passage of a boiler is termed as draft. Draft can also be referred to as the difference in pressure in the combustion chamber area which results in the motion of the flue gases and the air flow.
What are the 3 types of boiler?
There are three main types of boilers you can install into your home: combi boilers, heat only (regular boilers) and system boilers.
What are the two main types of boiler?
There are two basic types of boilers: firetube and watertube. The fundamental difference between these boiler types is which side of the boiler tubes contain the combustion gases or the boiler water/steam.
What is the difference between supercritical and ultra-supercritical?
A supercritical plant will have an efficiency of maybe 42 per cent and a typical ultra-supercritical plant will achieve around 44 per cent (designs going up to 47 per cent are being developed).
What is Draught system?
Meaning of Draught: In a boiler, the combustion of the fuel requires supply of sufficient quantity of air and removal of exhaust gases and this is achieved by draught system. The circulation of air is caused by a difference in pressure, known as draught.
What causes slagging?
One of the most common causes of slagging and fouling is secondary combustion at the upper furnace. The most common cause of secondary combustion is insufficient excess oxygen within the burner belt.
What is boiler slagging?
Slagging is the formation of molten or partially fused deposits on furnace walls of boiler or convection surfaces exposed to radiant heat. Fouling is defined as the formation of deposit on convection heat surfaces such as superheater and reheaters.
What is the working principle of centrifugal pump?
The working principle of a centrifugal pump is based on forced vortex flow. The forced vortex flow means that when a certain mass of fluid rotates by an external force (leading to an external torque), there is an increase in the pressure head of the liquid.
What are some good references on supercritical recirculation boilers?
LIST OF REFERENCES l. – The Supercritical Recirculation Boiler H. H. Hemenway T. F. Walsh The American Power Conference 1967 Title RileyApr1971.pdf Author Inspiration Created Date 8/9/2012 8:28:40 AM
What is a recirculation pump on a boiler?
The recirculation pump operates in parallel with the main boiler feed pump, and thus handles only recirculated fluid rather than a combination of recirculated and through flow that would be required by a series located pump. The actual on line recirculation pump power is approximately 100 horsepower.
What is the difference between positive displacement and centrifugal pumps?
In general, centrifugal pumps are designed to be well suited for fluids with relatively low viscosity, such as water or light oil. More viscous fluids require more horsepower for centrifugal pumps to run. For fluids with higher viscosities, positive displacement pumps are better than centrifugal pumps to help reduce energy costs.