Explanation: Reheat cycle is worked with rankine cycle
to remove the moisture from the steam
.
What is the purpose of reheating and regeneration in Rankine Cycle?
Reheating of
steam improved the thermal efficiency of the plant
, net work output of turbine, reduction in blade erosion (or quality of steam improve). By regeneration thermal efficiency of the plant can be increased but it does not affect work output from turbine.
What is the purpose of reheat cycle?
The purpose of a reheating cycle is
to remove the moisture carried by the steam at the final stages of the expansion process
. In this variation, two turbines work in series. The first accepts vapor from the boiler at high pressure.
What is Reheat Rankine Cycle?
A Reheat Rankine Cycle is
a Superheat Rankine Cycle that uses two turbines to make it possible to operate the condenser at a low pressure
and still maintain a very high quality at the turbine effluent. Boiler – heat added at constant pressure. … Boiler – heat added at constant pressure.
What is the use of reheat?
The main purpose of reheating is
to avoid excess moisture in steam at the end of expansion to protect the turbine
. But it need not improve the cycle efficiency. That will depend (as Dmitri said) upon whether the mean temperature of reheat addition is > or < the mean temperature of heat addition before reheat.
What are the advantages of reheating?
Advantages: The advantages of using a reheat cycle are
higher thermal efficiency, reduced feed water pump power
, smaller condenser, smaller boiler, long life of the turbine and less handling of the fuel and firing requirement.
Which one of the following is an advantage of reheat cycle?
The main advantage of the reheat cycle is that it
increases the dryness fractions of steam at condenser inlet
thus making it possible to use higher boiler pressure. It also increases the net-work output thus decreasing the mass flow rate of steam required for the same power output.
What is the basic principle of regeneration?
What is the basic principle of regeneration? Explanation: In
regeneration steam from condenser is circulated through turbine to increase steam temperature before it enters boiler
. Explanation: Feedwater is preheated so as to decrease the fuel consumption which increases efficiency.
What is the effect of reheating on Rankine cycle?
The Rankine cycle performance and efficiency can be improved with the reheat cycle as well as by regenerative cycle. It can be improved by
increasing the thermodynamic properties of the steam entering into the turbine
. At the initial stage, increased pressure results in increased expansion ratio.
What is the effect of reheat on system quality?
Explanation: Reheat
increases work output
.
How can I improve my Rankine efficiency?
- Decreasing the condenser pressure. The effect of lowering the condenser pressure on the Rankine cycle efficiency is illustrated on a T-s diagram on the left. …
- Superheating the steam to a high temperature. …
- Increasing the boiler pressure.
What is difference between Rankine and actual Rankine cycle?
| Rankine Cycle Representation is as follows on P-v and T-s diagrams: | Ideal Rankine Cycle 1-2′-b-3′-4′-1 | Actual Rankine Cycle 1-2-b-3-4-1 |
|---|
What is the efficiency of Rankine cycle?
In modern nuclear power plants, which operate the Rankine cycle, the overall thermal efficiency is
about one-third (33%)
, so 3000 MWth of thermal power from the fission reaction is needed to generate 1000 MWe of electrical power.
Why do we use economiser?
An economizer is a
mechanical device used to reduce energy consumption
. Economizers recycle energy produced within a system or leverage environmental temperature differences to achieve efficiency improvements.
What is reheat system?
terminal reheat system. A
type of air handling system commonly integrated
with CAV and VAV systems that maintains comfort in a building by cooling the air at the air handling unit and then reheating the air near its point of use.
What is the process of reheat cycle?
In a reheat cycle,
the expansion takes place in two turbines
. The steam expands in the high-pressure turbine to some intermediate pressure, then passes back to the boiler, where it is reheated at constant pressure to a temperature that is usually equal to the original superheat temperature.
