Which of these is a disadvantage of open heater? Explanation: The disadvantage is the necessity of a pump at each heater to handle the large feedwater stream. 12.
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What is the purpose of using open heaters in steam power plants?
A feedwater heater is a power plant component used to pre-heat water delivered to a steam generating boiler. Preheating the feedwater reduces the irreversibilities involved in steam generation and therefore improves the thermodynamic efficiency of the system.
Why atleast one open heater is used?
Why at least one open heater is used? Explanation: The open heater works as a deaerator.
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What are the various advantages of using multiple feedwater heaters?
Reduce fuel required for combustion by increasing the initial water temperature to the boiler; Reduce heat losses in the condenser; Minimize thermal transients within the boiler; Lower emissions as fuel use is reduced due to improved heat rate.
Why are feed water heaters used?
Introduction. A feedwater heater is used in a conventional power plant to preheat boiler feed water. The source of heat is steam bled from the turbines, and the objective is to improve the thermodynamic efficiency of the cycle.
Which device utilizes the heat of steam for heating feed water?
Superheater: A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, steam engines, and in processes such as steam reforming.
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 are the advantages of open heaters?
7. What are the advantages of open heater? Explanation: Open heaters are cheap as compared to closed heaters, in closed heaters feedwater temperature is not high.
What is the difference between an open and a closed feedwater heater FWH )?
There are actually two main types of feedwater heaters. If the steam mixes with the compressed water from the pump, it is an open feedwater heater. If the steam does not mix with the compressed water from the pump, it is a closed feedwater heater.
Which statement is true for open feedwater heaters?
Which of the following is true for an open heater? Explanation: The open heater has high heat transfer capacity. 7.
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.
How do feedwater heaters increase efficiency?
By increasing the feed water temperature, the feed water heater increases the overall efficiency of the steam power plant. Feed water heater increases the feed water temperature near to the boiling point. So, the interning water of the boiler can easily transfer into steam and improve the efficiency of the plant.
How does a feedwater heater work?
Feedwater heaters use extraction steam from the turbine to raise the temperature of water destined for the boiler. Water first passes through low-pressure heaters and into the deaerator where excess oxygen is removed. The feedwater then passes into the high-pressure heaters where it is further heated and pressurized.
What is deaerator principle?
Thermal deaeration relies on the principle that the solubility of a gas in water decreases as the water temperature increases and approaches its boiling point. … Deaeration is done by spraying feedwater into a chamber to increase its surface area, and may involve flow over multiple layers of trays.
Is one of the advantage of reheat cycle?
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 device is used for increasing the pressure of feed water?
Unsourced material may be challenged and removed. A boiler feedwater pump is a specific type of pump used to pump feedwater into a steam boiler.