What is a dual pressure boiler?
A dual pressure boiler system has a bottom furnace that operates as a low pressure natural circulation steam generating system and a top furnace that operates as a high pressure natural circulation steam generating system.
What is the importance of steam cycle?
Mixed gas-steam cycles have been proposed to increase the efficiency of gas turbine engines. These cycles allow exhaust heat to be recovered for re-use within the gas turbine plant and are an attractive alternative to combined cycles for small and middle range industrial power plants.
What is steam cycle in power plant?
This cycle of boiling, expansion, condensation and return to the boiler is commonly known as the Rankine Cycle. Steam turbines generally operate within such a thermodynamic cycle with work produced by the expansion of steam from a high pressure to a low pressure.
What is high pressure steam used for?
High-pressure steam boilers are essential for providing higher energy transfer to down-stream point-of-use equipment. High-pressure steam is also used directly in industrial processes such as vulcanizing rubber, food processing, and manufacturing other goods.
What are the advantages of double evaporation boiler?
A double evaporation boiler uses two independent systems for steam generation and therefore avoids any contamination between the primary and secondary feedwater.
What is a boiler feedwater circulation system?
Boilers use thermal circulation, in which water is exposed to heat and begins to turn into a water/steam mixture. Since a combination of water and steam is less dense than water, gravity will cause the water to move down and the steam/water mixture to rise.
Which steam cycle is more ideal?
Rankine cycle
The Rankine cycle is the ideal cycle for vapor power plants; it includes the following four reversible processes: 1-2: Isentropic compression Water enters the pump as state 1 as saturated liquid and is compressed isentropically to the operating pressure of the boiler.
What is the main advantage of the usage of high pressure boilers in a thermal plant?
What is the main advantage of the usage of high pressure boilers in a thermal plant? c. Low grade fuel can be burnt.
What is a combined cycle unit?
Combined cycle units are made up of one or more such gas turbines, each with a waste heat steam generator arranged to supply steam to a single or multiple steam turbines, thus forming a combined cycle block or unit.
What is the difference between high pressure steam and low pressure steam?
Low-pressure steam is limited to 15 PSI (pounds per square inch). High-pressure steam applications require more than 15 PSI.
What are the advantages of high pressure boilers?
Advantages of High-Pressure Boilers:
- These boilers require less floor space to install the setup.
- Forced Circulation of water is used in High-Pressure boilers which ensures positive circulation of fluid/water.
- The tendency of scale formation is minimized due to the high velocity of the water.
How many feedwater systems are there in a double evaporation boiler?
What is the dual pressure cycle?
Dual cycle, or limited pressure cycle, is a thermodynamic cycle that combines the Otto cycle and the Diesel cycle. In the dual cycle, combustion occurs partly at constant volume and partly at constant pressure. It can be used to describe internal combustion engines.
What are the advantages of steam turbine power plants?
Due to the lower exhaust gas temperatures, HRSGs designed for combustion engine power plants are much simpler in design, creating steam at one pressure level – approximately 15 bar. The steam turbine process adds approximately 10-20\% to the efficiency of the Flexicycle power plant.
What are the advantages of a dual flash power plant?
Using two separators leads to the use of a two-stage steam turbine, whereby one stage operates at high pressure and the other at low pressure. Dual flash power plants are able to produce up to 15–25\% more power than a single flash power plant as their power production capacity is in the range of 4.7 MW–110 MW.
What is the efficiency of a combined cycle power plant?
In combined cycle mode, power plants can achieve electrical efficiencies of up to 60 percent. The process for creating steam to produce work using a steam turbine is based on the Rankine cycle. Combined Cycle Gas Turbine (CCGT)