Similar performance benefits are also available in gas turbine an
reciprocating gas engine cogeneration systems. For example, an
class technology gas turbine generator with feeding to an HRSG
(which in turn provides process steam) can yield overall energy
effectiveness levels between 80-85% depending upon process
steam conditions. In comparison, the same F-class gas turbine i
combined cycle (and producing power only) yields an overall
energy effectiveness of between 50-55% depending upon the c
design. This comparison is illustrated in Figure 3.
In the past, many a good Machinery Manager was “made” through many
years of experience, and also through many costly mistakes. These “experts”
passed on their experience to the people they worked with, but seldom could
experience gained in one particular location prepare someone for the multitude
of things that can go wrong. It is because of this that the authors must be commended
for their effort to disseminate not only their experience, but also the
lessons they learned from many other experts....
Chapter 9 - Gas power cycles. The objectives of Chapter 9 are to: Evaluate the performance of gas power cycles for which the working fluid remains a gas throughout the entire cycle; develop simplifying assumptions applicable to gas power cycles, review the operation of reciprocating engines, analyze both closed and open gas power cycles,...
Chapter 9 - Gas power cycles. The objectives of Chapter 9 are to: Evaluate the performance of gas power cycles for which the working fluid remains a gas throughout the entire cycle, develop simplifying assumptions applicable to gas power cycles, review the operation of reciprocating engines, analyze both closed and open gas power cycles,...
With combined power and heat generation (cogeneration) the
waste heat incurred during engine operation is recovered and
utilized to satisfy thermal system process requirements for low-
grade steam and/or hot water. In many cases this utilization of
waste heat results in overall systems of efficiencies of up to 90+%
(thermal + electrical). This efficient form of energy conversion is
able to achieve primary energy savings of about 40% using gas
engine cogeneration systems, compared with conventional
separate power and heat generation.
Universal sensitivity to our environment and environmental
considerations have led to the development of projects that not
only minimize GHG (Green House Gas) emissions, but also help to
displace GHG emissions from existing plants as well as other
emissions sources. Thus, one of the more significant advantages
for gas turbine, combined cycles and gas reciprocating engines is
the potential for GHG reductions as compared to less efficient
Cogeneration is frequently defined as the sequential production
of necessary heat and power (electrical or mechanical) or
the recovery of low-level energy for power production. This
sequential energy production yields fuel savings relative to
separate energy production facilities because both the heat and
power requirements are satisfied from a common/single fuel