A cogeneration system incorporating a diverter valve uses this to do which of the following?
Allow combustion gases to enter the HRSG
Allow steam entering into the steam turbine
Expel the combustion gases back into the turbine
All of the above
None of the above
Which of the following is the first step in starting up a cogeneration system?
The gearbox will engage the starting motor
Turbine is rotated to about 55% of rated speed
Diverter valve will open to atmosphere
Operator initiates a turbine start up from the control room
Water jackets used in a cogeneration system are used to serve which purpose?
Recover the heat produced to cool the engine
Cool the air surrounding the engine
Cool the lubricating oil of the engine
Carbon dioxide, one of the most important parts of the combustion process is well known for which of the following?
Climatic change
Greenhouse effect
Acid rain
1 and 2
The level of NOx emissions is dependant on which of the following?
Combustion chamber geometry
Air/fuel mixture
Pressure
Temperature
The main application for a HRSG is to do which of the following?
Steam generation using gas turbine exhaust
Steam generation using BFW
Decrease the load on a single piece of equipment
A HRSG unit may include auxiliary or duct burners that are used to do which of the following?
Increase the production of steam
Control the superheater temperatures
Meet process steam temperature requirements
Low thermal requirements of a control system may occur during which of the following times?
During start-up
During times of low production
During times of low electrical requirements
A cogeneration system that is not connected to the electrical grid will do which of the following?
Supply all the electrical requirements at the site
Supply emergency back up electrical requirements
Supply back up electrical requirements
The biggest advantages of a combined cycle power plant with a single- shaft gas/steam turbine arrangement are?
Highest level of thermal efficiency
Extremely low capital cost
Short project and construction times
Low operation and maintenance costs
Multi shaft combined- cycle power plants have high efficiency at base load operation.
The extra electricity produced by the combined cycle plant gives it which of the following advantages over the conventional steam generating plant?
Significant increase in thermal efficiency
Emissions to atmosphere are lower
Less fuel is needed
A fully- fired combined cycle cogeneration system may include which of the following?
Fired HRSG
Gas turbine
Steam turbine
Generators
Combined cycle cogeneration refers to which of the following?
Production of electricity from two sources utilizing one fuel source
Production of electricity from one source utilizing two fuel sources
Production of electricity from one source utilizing only a single fuel source
The acronym HRSG represents which of the following?
Hot reboiler steam generator
Hot recovery steam generator
Heat recovery steam generator
Heater reboiler steam generator
Cogeneration can increase the overall plant efficiency to a value between __ and __%?
30 and 40
40 and 60
40 and 50
60 and 90
95 and 100
Various types of simple-cycle cogeneration plants include which of the following?
Waste heat cogeneration
Heat engine cogeneration
Back pressure steam turbine
