How Have Boilers And Pumps Improved In Vapor Power Cycles? - Fixanswer

Alternative way of increasing the Rankine cycle efficiency is by

increasing the boiler operating pressure

and thus in a way related with the temperature at which boiling is taking place in the boiler. Thus the thermal efficiency of the cycle increases.

What is vapor power cycle?

Vapour power cycles are

used in steam power plants

. In a power cycle heat energy (released by the burning of fuel) is converted into work (shaft work), in which a working fluid repeatedly performs a succession of processes. In a vapour power cycle, the working fluid is water, which undergoes a change of phase.

How can we increase the efficiency of boiler in thermal power plant?

Increase Boiler Efficiency: Lower the Stack Temperature.
Install an Economizer.
Tune the Burner Regularly.
Install a Variable Frequency Drive.
Increase Boiler Efficiency: Insulate your Valves.
Clean the Fireside.
Preheat Combustion Air.
Control Blowdown Rate.

What is the effect of increasing the boiler pressure on heat supplied?

Increasing the operating pressure of the boiler,

automatically raises the temperature at which boiling takes place

. This raises the average temperature at which heat is added to the steam and thus raises the thermal efficiency of the cycle..

Which one of the following is most popular vapour power cycle?

Rankine cycle

is an ideal cycle of heat engine which uses water and steam as a working fluid to generate power with the help of a steam turbine.

What is the main difference between gas and vapor power cycles?

In vapour power cycle, the working fluid exists in vapor phase during one part of the cycle and in liquid phase during another part whereas in a gas power cycle, the working fluid remains in the gaseous phase throughout the entire cycle.

What cycle is the most efficient?

The most efficient heat engine cycle is the

Carnot cycle

, consisting of two isothermal processes and two adiabatic processes. The Carnot cycle can be thought of as the most efficient heat engine cycle allowed by physical laws.

Do heat pumps use Rankine cycle?

Thermoelectric heat pumps are used to increase the efficiency of the Rankine cycle

. We scavenge the enthalpy released in the condenser for preheating the return water.

Which of the following will improve the thermal efficiency of a Rankine cycle?

The thermal efficiency of the Rankine cycle can also be increased by:

Increasing the average temperature of the working fluid at which heat is added to the cycle

. Decreasing the average temperature of the working fluid at which heat is rejected by the cycle.

How does the reheat cycle improve the efficiency of the simple Rankine cycle?

In case of two reheats, steam is super-heated twice at different constant temperatures.

A high reheat pressure increases the the moisture content at turbine exhaust which results in scaling and it should be optimised

. Thus the work produced is increased ,thereby efficiency increases.

What are the main components of vapour power cycle?

1 Overview. The power cycle for generating electricity from steam-dominated resources is comparatively simple, consisting of a

turbine-generator, condenser, and waste heat rejection system

. In principle, these elements are similar to the components used in traditional thermal power plants.

What are the advantages of using combined cycle power plants?

What are the advantages of a combined cycle?

Flexibility. Combined-cycle plants can adapt to electricity demand or production needs

. This type of plants can operate at full capacity with high demand and can bring its operation capacity down to a 45% partial load.

Why Carnot vapour power cycle is considered non practical cycle?

Though the Carnot cycle is more efficient than any other cycle even though it is not considered the practical cycle for steam power plants, because:

Steam is partially condensed in the condenser stopping at point 3

. The condensate at state point 3, in the form of water and its vapour, is pumped to boiler pressure.

What are the factors to improve efficiency of a boiler?

Supply of Air/Steam to Burner

Controlling excess air within the required range will lead to decrease in the flue gas losses. Every 1% reduction in the excess air supplied to the furnace results in approx 0.6% increase in the boiler overall efficiency. Pro-Tips: Excess Air/steam to be reduced or avoided.

How economizer increases the efficiency of the boiler?

An economizer

captures and redirects sensible heat from the hot flue gas that normally goes up the boiler stack

. This sensible heat increases the temperature of boiler feedwater or makeup water. On average, adding a standard economizer increases boiler system efficiency by 3 percent to 5 percent.

What affects boiler efficiency?

The three main factors in determining efficiency are therefore

flue-gas exit temperature, excess air and burnout

, all of which are dependent on the technology. The flue-gas exit temperature is related to boiler design rather than the combustor.

What pump is used in Rankine cycle?

The Rankine cycle operates in the following steps: 1-2-3 Isobaric Heat Transfer. High pressure liquid enters the boiler from the

feed pump

(1) and is heated to the saturation temperature (2). Further addition of energy causes evaporation of the liquid until it is fully converted to saturated steam (3).

Are pumps isentropic?

Pump isentropic efficiency

The efficiency is a comparison between the isentropic work and the actual work. For pumps,

the isentropic work is the least work that a pump requires in order to produce a certain pressure rise

.

Which of the following contributes to the improvement of efficiency of Rankine cycle in thermal power plant?

Thermal efficiency of Rankine cycle can be improved by

increasing the mean temperature of heat addition

, by using of high pressure steam. The mean temperature of heat addition can be increased by using super heat, reheat and regeneration.

Which of the following losses occur in a vapour power cycle?

Explanation: These are the major losses that happen in a cycle including

condenser losses

. Explanation: These two factors contribute to the piping losses. 4. The heat transfer and the pressure drop reduces the availability of steam.

What is the importance of the freezing point of the working fluid in the vapour power cycle Mcq?

9. What is the importance of the freezing point of the working fluid in the vapour power cycle? Explanation:

For the efficient working of a working fluid, its freezing point should be below the room temperature

. 10.

Which ideal process is carried out at the turbine in vapour power cycle?

Q3. Which ideal process is carried out at the turbine in vapour power cycle? Q5. In the following T-s diagram of Rankine cycle, process (1-2) is heat addition in boiler, process (2-3) is an expansion at turbine, process (3-4) is a condensation process and process (4-1) is a pumping process at feed pump.

What is the difference between gas and vapour Brainly?

A gas is a substance above its critical temperature but below its critical pressure, while a vapor is a substance above its boiling point temperature

.

What are the differences between vapour and gas?

GAS VAPOUR	Gas exists in gaseous state at room temperature Vapour exists in equilibrium with solid or liquid state at room temperature	It is a state of matter It coexists with liquid or solid at room temperature

What is the difference between gas and vapour for Class 9?

A vapour is a substance which has experienced a phase change. A gas is a substance which has not, and will not experience a phase change

. Vapour is a solid or a liquid at room temperature, that its natural state of matter is either a solid or a liquid. The natural state of matter for a gas is a gas.