What is the efficiency of HRSG?
The HRSG forms a major part of the steam system. In the combined cycle mode, the efficiency of the combined gas turbine-plus-HRSG system can reach 55–60% (lower heating value basis) with modern advanced machines, while in cogeneration mode, the system efficiency can be as high as 75–85%.
What is superheater in HRSG?
HRSGs consist of four major components: the economizer, evaporator, superheater and water preheater. Each section has a steam drum and an evaporator section where water is converted to steam. This steam then passes through superheaters to raise the temperature beyond the saturation point.
How does a HRSG work?
An HRSG is a kind of heat exchanger that recovers heat from the exhaust gases of a gas turbine to an extreme degree. The heat is recovered in the form of steam which is served as the power source of a power-generating steam turbine.
What is evaporator in HRSG?
Evaporator. This is where the heat from the gas turbine exhaust turns the water in the tubes into steam. The evaporator is so important that it defines the overall HRSG configuration.
What is the difference between HRSG and boiler?
Most of the HRSG’s are internally insulated so that expansion does not affect the external surfaces and the structures. Conventional boilers on the other hand are top supported and free to expand so the insulation is on the outside.
How can I improve my HRSG efficiency?
In a conventional boiler, it is a well known fact that increasing the excess air decreases the boiler efficiency. In a HRSG,the excess air is decreased by addition of fuel, which increases the efficiency. Also, we have a lower exit gas temperature, which also contributes to the efficiency improvement.
What is capacity of superheater?
A superheater can vary in size from a few tens of feet to several hundred feet (a few metres to some hundred metres).
What is the difference between boiler and HRSG?
What is HRSG test?
Annual visual inspections of HRSGs can reveal important details about the condition of components, including insulation damage, external tube damage, through-wall corrosion and fouling. …
What is the function of HRSG in combined cycle power plant?
The HRSG is a key component of a combined cycle power plant. Its role is to convert as much of the heat as possible from the exhaust gas of the gas turbine into steam for a steam turbine.
What is the difference between HRSG and Whrb?
A waste heat recovery boiler (WHRB) is different from a heat recovery steam generator (HRSG) in the sense that the heated medium does not change phase.
What is boiler efficiency?
Definition of Boiler Efficiency is “The percentage of the total absorption heating value of outlet. steam in the total supply heating value.” In other word, it is a rate how the boiler runs efficiently.