Internal-combustion engines – Combined devices
Reexamination Certificate
2001-10-23
2003-08-05
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Combined devices
C290S00100C
Reexamination Certificate
active
06601542
ABSTRACT:
BACKGROUND
The described technology relates generally to containment systems for portable power modules and, more particularly, to liquid containment systems for containing liquids within portable power modules trailerable over public roads and capable of providing at least approximately one megawatt of electrical power.
There are many occasions when temporary electrical power may be required. Common examples include entertainment and special events at large venues. As the demand for energy quickly outstrips supply, however, temporary electrical power is being used in a number of less common applications. For example, as electrical outages occur with increasing regularity, many commercial enterprises are also turning to temporary electrical power to meet their demands during peak usage periods.
A number of prior art approaches have been developed to meet the rising demand for temporary electrical power. One such approach is a mobile system that generates electrical power using a liquid fuel motor, such as a diesel fuel motor, drivably coupled to an electrical generator. This system is capable of producing up to two megawatts of electrical power and can be housed within a standard shipping container, such as a standard 40-foot ISO (International Standard Organization) shipping container. Enclosure within a standard shipping container enables this system to be quickly deployed to remote job sites using a conventional transport vehicle, such as a typical tractor truck.
Temporary electrical power systems that use liquid fuels, such as petroleum-based fuels, however, have a number of drawbacks. One drawback is associated with the motor exhaust, which may include undesirable effluents. Another drawback is associated with the expense of procuring and storing the necessary quantities of liquid fuel. As a result of these drawbacks, attempts have been made to develop temporary electrical power systems that use gaseous fuels, such as natural gas.
One such attempt at a gaseous fuel system is illustrated in
FIG. 1
, which shows a side elevational view of a power generation system
100
in its normal operating configuration. The power generation system
100
includes a motor
110
drivably coupled to a generator
120
. The motor
110
is configured to burn a gaseous fuel, such as natural gas, and is capable of mechanically driving the generator
120
to produce an electrical power output on the order of one megawatt. The motor
110
and generator
120
are housed within a standard 40 foot ISO shipping container
102
, which is supported by a trailer
103
having a tandem axle rear wheel-set
104
. The trailer
103
can be coupled to a typical transport vehicle, such as a tractor truck, for movement of the container
102
between job sites.
Unlike their diesel fuel powered counterparts, gaseous fuel power generation systems of the prior art, such as that shown in
FIG. 1
, have an exhaust gas silencer
114
and a motor coolant radiator
118
installed on top of the container
102
during normal operation. This configuration is dictated by a number of factors, including the size of the gaseous fuel motor
110
and the amount of heat it gives off during operation. The size of the motor
110
reduces the space available inside the container
102
for the exhaust gas silencer
114
and the radiator
118
, and the large amount of heat generated by the motor creates an unfavorable thermal environment inside the container for the radiator. Although the exhaust gas silencer
114
and the radiator
118
are installed on top of the container
102
during normal operation, during movement between job sites these components are removed from the top of the container to facilitate travel over public roads.
During normal operation, an air moving system
143
draws ambient air into the container
102
through a first air inlet
130
on one side of the container and a complimentary second air inlet
132
on the opposing side of the container. This ambient air is used for cooling of the motor
110
and the generator
120
and for combustion in the motor. The portion of this air used for cooling, identified as air
131
, is discharged out the back of the container
102
by the air moving system
143
.
A number of shortcomings are associated with the prior art power generation system
100
. One shortcoming is the number of transport vehicles required to deploy the power generation system
100
to a given job site. For example, although the container
102
with the motor
110
and the generator
120
inside can be transported to the job site using only one transport vehicle, an additional transport vehicle is also required to carry the exhaust gas silencer
114
and the radiator
118
. In addition, once at the job site, both the exhaust gas silencer
114
and the radiator
118
need to be installed on top of the container
102
and the necessary structural and functional interfaces connected and verified. The exhaust gas silencer
114
and the radiator
118
must then be removed from the top of the container
102
when it comes time to move the power generation system
100
to a second job site.
Additional shortcomings are associated with the configuration of the prior art power generation system
100
. For example, placement of the radiator
118
on top of the container
102
causes any coolant leaking from the radiator to flow onto the top of the container. This coolant may then find its way undesirably onto the ground adjacent to the portable power module. Similarly, onboard liquids, such as lubricants and coolant that may leak from the engine
110
, as well as rainwater brought in through the first and second air inlets
130
and
132
, may collect inside the container
102
during periods of operation. These liquids can also leak onto the adjacent ground through various fastener holes or seams in the bottom of the container
102
.
The foregoing shortcomings of the prior art power generation system
100
offset many of the benefits associated with such a system. Therefore, a temporary electrical power generation system that uses gaseous fuel and has the ability to provide at least approximately one megawatt of electrical power without these shortcomings would be desirable.
REFERENCES:
patent: 6450133 (2002-09-01), Bernard et al.
General Electric Company
Kamen Noah P.
Perkins Coie LLP
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