Gas turbine cycle is one of
thermodynamic cycle processes. Rankine cycle uses steam as the working fluid.
The Rankine cycle performance control is formed by the percentage of the
existing highest and lowest cycle temperatures. The existing highest steam temperature
in a Rankine cycle is about 1100 F (594 C), which usually is established mainly
by material restrictions at the increased pressures of the cycles of steam.
Just one indicates of advancing the performance control is to change the
working fluid by using gas or air.
Figure 1: Gas Turbine Cycle |
The gas turbine cycle process in
the most basic form contains a turbine, combustor and also compressor as shown
in Figure 1. Due to its simpleness, low budget fee and quick lead time period,
gas turbine is now being applied by several utilities to increase capability in
smaller batches. Utilization of the gas turbine cycle process in combination
with Rankine cycle which uses steam can be an efficient indicates of
recuperating several heat lost as soon as combustion gases are discharged to the
environment at excessive temperatures.
In the basic gas turbine cycle
process as demonstrated in Figure 1, air is pressurized then combined together
with fuel and also burnt in the combustor. The gaseous combustion items which
have high temperature get into turbine to generate work through expansion. A
part of the work generated by turbine is utilized to generate the compressor
and the rest is obtainable to generate power. The exhaust gases of turbine are
subsequently vented to the environment. To assess the cycle, some simplifying
suppositions are created.
First, however the process of
combustion alters the working fluid arrangement, the fluid is addressed as a
gas of individual arrangement all through, and it's deemed an suitable gas to
get basic relationships among points in the process. Second, the process of
combustion is assumed as a uncomplicated heat transfer process where the heat
enter to the working fluid is established by the heating values of fuel. A
outcome of this estimation is that the flow rate of mass as a result of the
process stays consistent. The final estimation is to suppose that every of the
functions which can be reversed internally.
When the expansion of turbine is
finished with the exhaust gas at the similar pressure as the inlet air of
compressor, the collaboration of operations could be considered as a cycle. The
simple suppositions above provide the perfected gas turbine cycle known as air
common Brayton cycle. Figure 2 below displays the cycle on P-v and Ts diagrams
that allow identifying the condition parameters at the several cycle areas.
Figure 2: Brayton Cycle |
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