DESCRIPTION
INTAKE AIR COOLING APPARATUS FOR STATIONARY INTERNAL COMBUSTION
ENGINE
TECHNICAL FIELD
[0001]
The present invention relates to a water-saving intake
air cooling apparatus for a stationary internal combustion
engine, which can be installed especially in a region where
water is valuable and an outside air temperature is high.
BACKGROUND ART
[0002]
Intake air supplied to a combustion chamber formed in a
cylinder of an internal combustion engine is cooled by a cooler
before being supplied to the combustion chamber in order to
improve a charging efficiency. In an internal combustion
engine having a turbo charger in particular, intake air
compressed by a compressor of the turbo charger is normally
heated to 100 to 200°C, and therefore a heat exchanger is
provided in an intake air passage on an outlet side of the
compressor in order to cool the heated intake air. Heat removed
from the intake air by the heat exchanger is then discharged
into the atmosphere by a radiator or the like.
1
%
[0003]
Patent Document 1 discloses an intake air cooling
apparatus for an internal combustion engine, which includes an
absorption chiller that supplies a low temperature refrigerant
to a cooler that cools intake air. This apparatus will now be
described using Fig. 3 (Fig. 2 of Patent Document 1) . In Fig.
3, an exhaust pipe 102 and an intake pipe 104 are connected to
a diesel gas engine 100. An exhaust gas passage 106 for
discharging exhaust gas from the diesel gas engine 100 to the
outside is connected to the exhaust pipe 102, and an intake air
passage 108 for introducing outside air is connected to the
intake pipe 104.
[0004]
A turbo charger 110 is provided to straddle the exhaust
pipe 102 and the intake pipe 104. In the turbo charger 110,
an exhaust gas turbine 112 provided in the exhaust pipe 102 and
a compressor 114 provided in the intake pipe 104 are formed
integrally via a shaft 116. A heat exchanger 118 is interposed
in the intake pipe 104. A pipeline 120 is provided between the
heat exchanger 118 and an absorption chiller 122. The pipeline
120 extends into a heat exchanger 124 of an evaporator forming
the absorption chiller 122. Cooling water is supplied from the
absorption chiller 122 to the heat exchanger 118 through the
pipeline 120.
2
[0005]
The exhaust gas passage 106 and a heat exchanger 126 for
a generator forming the absorption chiller 122 are connected
by a pipeline 128. An exhaust gas heat exchanger 130 connected
to the pipeline 128 is provided in the exhaust gas passage 106.
[0006]
Thermal energy recovered from exhaust gas (e) flowing
through the exhaust gas passage 106 by the exhaust gas heat
exchanger 130 is transferred to the generator heat exchanger
126 through the pipeline 128 using steam as a medium. The
absorption chiller 122 is operated by this thermal energy and
cooling water transferred from a cooling tower or the like.
When the absorption chiller 122 is operated, cooling water
flowing through the heat exchanger 124 of the evaporator is
cooled. The cooling water cooled by the heat exchanger 124 is
transferred to an air cooler 118 in order to cool intake air
(a) flowing through the intake pipe 104.
[0007]
In this intake air cooling apparatus, the absorption
chiller 122 that consumes little power is used, and heat
possessed by the exhaust gas (e) is used as a heat source of
the absorption chiller 122. As a result, an improvement in
thermal efficiency can be achieved.
Note that Fig. 3 of Patent Document 1 discloses an example
3
in which heat possessed by the cooling water after cooling the
diesel gas engine 100 is used as the heat source of the absorption
chiller.
[0008]
Patent Document 1: Japanese Patent Application
Publication S58-79618
[0009]
Typically, a cooling tower is provided together with the
absorption chiller, and the cooling water supplied to the
evaporator and an absorber is cooled in the cooling tower using
the latent heat of vaporization of water. For this purpose,
the cooling tower requires a large amount of water. Further,
when high temperature outside air is used as intake air in a
region where an outside air temperature is high, such as a
tropical region, the intake air compressed by the turbo charger
is heated to a high temperature. Therefore, a unit that can
cool high temperature intake air highly efficiently is required.
Hence, when a stationary internal combustion engine is
installed in a region where water is valuable or a region having
a high air temperature such as a tropical region, it is difficult
to obtain sufficient output.
DISCLOSURE OF THE INVENTION
[0010]
4
The present invention has been designed in consideration
of this problem in the related art, and an object thereof is
to realize a water-saving intake air cooling apparatus that
consumes a small amount of water and can reduce an intake air
temperature highly efficiently even when employed in a
stationary internal combustion engine installed in a region
where water is valuable such that water shortages tend to occur
or a region where an outside air temperature is high.
[0011]
To achieve this object, an intake air cooling apparatus
for a stationary internal combustion engine according to the
present invention is an intake air cooling apparatus for a
stationary internal combustion engine in which a turbo charger
is provided in an intake air passage and an exhaust gas passage,
including: a first intake air cooler provided in the intake
air passage on an upstream side of a compressor forming the turbo
charger in order to perform primary cooling on intake air; a
second intake air cooler for performing secondary cooling on
the intake air on an outlet side of the compressor after the
intake air is compressed and heated by the compressor; an
absorption chiller that uses heat possessed by exhaust gas from
the stationary internal combustion engine as a heat source and
supplies cooling water for cooling the intake air to the first
intake air cooler and the second intake air cooler; and a heat
5
exchanger that cools cooling water by performing heat exchange
between the cooling water and outside air and supplies the
cooling water to the absorption chiller as a cold source,
wherein intake air supplied to a combustion chamber of the
stationary internal combustion engine is cooled by the first
intake air cooler and the second intake air cooler.
[0012]
In the apparatus according to the present invention, the
outside air introduced into the intake air passage is first
subjected to primary cooling by the first intake air cooler on
the upstream side of the turbo charger. In so doing, even
outside air having a very high temperature, for example outside
air having a temperature of approximately 50°C, can be cooled
and introduced into the turbo charger. Next, the intake air
that has been compressed and heated by the compressor forming
the turbo charger is cooled by the second intake air cooler on
the downstream side of the turbo charger, and then supplied to
the combustion chamber of the stationary gas engine.
[0013]
The cooling water for cooling the intake air in the first
intake air cooler and the second intake air cooler is cooled
by the absorption chiller. Since the absorption chiller, which
consumes little power, is used as a unit for cooling the cooling
water that cools the intake air, and since heat possessed by
6
%
the exhaust gas and outside air are supplied to the absorption
chiller as a heat source and a cold source, respectively, an
extra heat source is not required. As a result, energy can be
conserved and an improvement in cooling efficiency can be
achieved.
[0014]
Furthermore, the heat exchanger that cools the cooling
water serving as the cold source of the absorption chiller uses
outside air as a cold source and does not therefore require water.
Accordingly, problems do not arise even in a region where water
is in short supply. Hence, the intake air cooling apparatus
according to the present invention can be operated while
conserving energy and exhibiting high efficiency even in a
region where water is valuable and the outside air temperature
is high.
[0015]
In the apparatus according to the present invention, the
second intake air cooler is preferably constituted by a high
temperature side intake air cooler that cools the high
temperature intake air compressed by the turbo charger, and a
low temperature side intake air cooler that further cools the
intake air cooled by the high temperature side intake air cooler
and then supplies the cooled intake air to a cylinder, a second
heat exchanger is preferably provided to supply cooling water
7
that has been cooled by exchanging heat with outside air, to
the high temperature side intake air cooler, and cooling water
is preferably supplied to the low temperature side intake air
cooler from the absorption chiller, while the cooling water used
for intake air cooling in the high temperature side intake air
cooler is returned to the second heat exchanger through a
cooling water jacket of the stationary internal combustion
engine.
[0016]
According to this configuration, the cooling water cooled
by the absorption chiller is supplied to the low temperature
side intake air cooler and the cooling water cooled by the second
heat exchanger is supplied to the high temperature side intake
air cooler. By dividing the cooling subjects in this manner,
the absorption chiller is sufficient despite having a smaller
cooling capacity than a vapor compression chiller or the like.
Further, the high temperature side intake air cooler
exchanges heat with the high temperature intake air on the
downstream side of the compressor, and therefore the
temperature of the cooling water does not have to be reduced
greatly. Hence, the second heat exchanger that uses outside
air as a cold source is sufficient. Furthermore, since the
second heat exchanger uses outside air as a cold source and does
not therefore require water, the second heat exchanger can be
8
operated in a region where water is in short supply.
[0017]
The apparatus according to the present invention
preferably further includes: an exhaust gas boiler provided
in the exhaust gas passage of the stationary internal combustion
engine; and a steam supply passage that supplies at least a part
of steam obtained in the exhaust gas boiler to the absorption
chiller, wherein the steam is supplied as a heat source of the
absorption chiller. Thus, the heat possessed by the exhaust
gas can be recovered efficiently and used as the heat source
of the absorption chiller. Further, the remaining steam can
be used as a heat source of another device.
[0018]
The apparatus according to the present invention
preferably further includes: a cooling water circulation
passage that circulates the cooling water between the
absorption chiller and either the second intake air cooler or
the low temperature side intake air cooler; a bypass passage
that is connected between an outward passage and a return
passage of the cooling water circulation passage in order to
return the cooling water that has been subjected to heat
exchange with the intake air compressed and heated by the turbo
charger and has been discharged from the second intake air
cooler or the low temperature side intake air cooler, to the
9
second intake air cooler or the low temperature side intake air
cooler without passing through the absorption chiller; a valve
mechanism capable of varying a flow rate of the cooling water
flowing through the bypass passage; and a controller that
controls the valve mechanism such that an amount of cooling
water supplied to the absorption chiller is controlled in
accordance with a load of the stationary internal combustion
engine. Thus, the temperature and flow rate of the cooling
water supplied to the second intake air cooler or the low
temperature side intake air cooler can be controlled by the
controller in accordance with the load of the stationary
internal combustion engine.
[0019]
The apparatus according to the present invention
preferably further includes: a temperature sensor that
detects a temperature of the cooling water supplied from the
absorption chiller to the second intake air cooler or the low
temperature side intake air cooler; and a controller that
controls an operation of the absorption chiller such that a
detection value of the temperature sensor reaches a target value.
Thus, the temperature of the cooling water supplied to the
absorption chiller or the low temperature side intake air cooler
can be controlled to a target temperature.
[0020]
10
The apparatus according to the present invention
preferably further includes: a third heat exchanger that
performs heat exchange between the outside air and lubricating
oil that circulates through a lubricating oil space formed in
a housing of the stationary internal combustion engine in order
to cool the lubricating oil; and a lubricating oil circulation
passage that communicates with the lubricating oil space in
order to lead the lubricating oil to the third heat exchanger.
Thus, the lubricating oil that circulates through respective
parts in the housing can be cooled by the third heat exchanger.
Moreover, the third heat exchanger does not use water as a cold
source and can therefore be operated in a region where water
is in short supply.
[0021]
With the apparatus according to the present invention,
an intake air cooling apparatus for a stationary internal
combustion engine in which a turbo charger is provided in an
intake air passage and an exhaust gas passage includes: a first
intake air cooler provided in the intake air passage on an
upstream side of a compressor forming the turbo charger in order
to perform primary cooling on intake air; a second intake air
cooler for performing secondary cooling on the intake air on
an outlet side of the compressor after the intake air is
compressed and heated by the compressor; an absorption chiller
11
that uses heat possessed by exhaust gas from the stationary
internal combustion engine as a heat source and supplies cooling
water for cooling the intake air to the first intake air cooler
and the second intake air cooler; and a heat exchanger that cools
cooling water by performing heat exchange between the cooling
water and outside air and supplies the cooling water to the
absorption chiller as a cold source, wherein intake air supplied
to a combustion chamber of the stationary internal combustion
engine is cooled by the first intake air cooler and the second
intake air cooler. Hence, a specialized heat source is not
required to operate the absorption chiller, and therefore
energy can be conserved and high efficiency can be realized
during an operation. Further, the intake air is cooled in two
stages, and therefore, even when high temperature outside air
is introduced as the intake air, the intake air supplied to the
combustion chamber can be cooled to a target temperature.
Moreover, water is not used as the cold source of the absorption
chiller, and therefore the apparatus can be operated without
problems even in a region where water is valuable. As a result,
an intake air cooling apparatus suitable for use in a region
where water is valuable and the outside air temperature is high
can be realized.
BRIEF DESCRIPTION OF THE DRAWINGS
12
%
[0022]
Fig. 1 is an overall block diagram showing an embodiment
in which the present invention is applied to a stationary gas
engine;
Fig. 2 is a flowchart showing operation procedures of this
embodiment; and
Fig. 3 is a block diagram showing a conventional intake
air cooling apparatus for an internal combustion engine.
BEST MODE FOR CARRYING OUT THE INVENTION
[0023]
The present invention will be described in detail below
using an embodiment illustrated in the drawings. Note, however,
that unless specific description is provided to the contrary,
dimensions, materials, shapes, relative arrangements, and so
on of constitutional components described in this embodiment
are not intended to limit the scope of the present invention.
[0024]
An embodiment in which the present invention is applied
to a stationary gas engine disposed in a region where an air
temperature is high and water shortages tend to occur, for
example an arid tropical region, will now be described on the
basis of Figs. 1 and 2. In Fig. 1, a housing 12 of a stationary
gas engine 10 is provided with a combustion chamber 13 formed
13
t
in a plurality of cylinders, a lubricating oil circulation
passage 14 for supplying lubricating oil to respective parts
in the housing 12, and a cooling water jacket 16 for cooling
the respective parts in the housing 12 using cooling water.
Note that the combustion chamber 13, the lubricating oil
circulation passage 14, and the cooling water jacket 16 are
illustrated in pattern form in Fig. 1. The stationary gas
engine 10 is connected to a power generator 20 via a flywheel.
[0025]
An intake system of the stationary gas engine 10 includes
a primary intake air cooler 22 that performs primary cooling
on taken-in outside air (a). A compressor 26a forming a part
of a turbo charger 26 is provided in an intake air passage 24
on a downstream side of the primary intake air cooler 22. A
high temperature side intake air cooler 28 and a low temperature
side intake air cooler 30 are interposed in the intake air
passage 24 on a downstream side of the compressor 26a. Intake
air (s) that has been compressed and heated by the compressor
26a is subjected to secondary cooling by the high temperature
side intake air cooler 28, then subjected to tertiary cooling
by the low temperature side intake air cooler 30, and then
supplied to the combustion chamber 13 of the stationary gas
engine 10.
[0026]
14
t
Exhaust gas e discharged from the combustion chamber 13
of the stationary gas engine 10 into an exhaust gas passage 32
drives an exhaust gas turbine 26b provided in the exhaust gas
passage 32. The exhaust gas turbine 26b and the compressor 26a
are connected by a shaft 26c, and the turbo charger 26 is
constituted by the compressor 26a and the exhaust gas turbine
26b. An exhaust heat boiler 34 is provided in the exhaust gas
passage 32 on a downstream side of the exhaust gas turbine 26b.
Raw material water (w) is supplied to the exhaust heat boiler
34, and steam is manufactured using heat possessed by the
exhaust gas (e) . The steam generated by the exhaust heat boiler
34 is supplied as a heat source to a generator (not shown) of
an absorption chiller 50, to be described below, through
pipelines 36 and 38.
[0027]
A part of the steam is supplied as a heat source to other
devices through a pipeline 40 that bifurcates from the pipeline
36. A three-way valve 42 is provided in a bifurcation portion
between the pipelines 36 and 40, and the steam can be distributed
between the pipeline 38 and the pipeline 40 using the three-way
valve 42.
[0028]
A cooling water circulation passage 46 is provided to
circulate cooling water to the cooling water jacket 16, the high
15
temperature side intake air cooler 28, and a second radiator
44. The second radiator 44 includes a mechanism such as a fan
for taking in the outside air (a) and a heat exchange unit for
performing heat exchange between the outside air (a) and the
cooling water, and functions to cool the cooling water using
the outside air (a). The cooling water cooled by the second
radiator 44 is circulated through the cooling water circulation
passage 46 in a direction of an arrow by a pump 48 . This cooling
water cools the intake air (s) in the high temperature side
intake air cooler 28 . The cooling water used to cool the intake
air (s) in the high temperature side intake air cooler 28 is
then transferred to the cooling water jacket 16 in order to cool
the respective parts in the housing 12.
[0029]
A first radiator 52 is provided together with the
absorption chiller 50 to supply cooling water to the absorption
chiller 50 for use as a cold source. The first radiator 52 is
configured similarly to the second radiator 44. More
specifically, the first radiator 52 includes an outside air
intake mechanism and a heat exchange unit for performing heat
exchange between the outside air (a) and the cooling water, and
functions to cool the cooling water using the outside air a.
The first radiator 52 and the absorption chiller 50 are
connected by cooling water circulation passages 54a and 54b,
16
n
and the cooling water is circulated between the first radiator
52 and the absorption chiller 50 by a pump 56 interposed in the
cooling water circulation passage 54a.
[0030]
As described above, steam is supplied to the absorption
chiller 50 as a heat source through the pipelines 36 and 38,
while cooling water is supplied as a cold source to a condenser
and an absorber (not shown) from the first radiator 52. The
absorption chiller 50 and the low temperature side intake air
cooler 30 are connected via cooling water circulation passages
58a and 58b. The cooling water cooled by the absorption chiller
50 is circulated through the cooling water circulation passages
58a, 58b by a pump 60 interposed in the cooling water circulation
passage 58a in order to cool the intake air (s) in the low
temperature side intake air cooler 30.
[0031]
A cooling water circulation passage 74a that supplies
cooling water to the primary intake air cooler 22 is connected
to the cooling water circulation passage 58a. A cooling water
circulation passage 74b that returns the cooling water that has
cooled the outside air (a) in the primary intake air cooler 22
to the cooling water circulation passage 58b is connected to
the cooling water circulation passage 58b. Hence, cooling
water is also supplied to the primary intake air cooler 22
17
through the cooling water circulation passage 74a that
bifurcates from the cooling water circulation passage 58a in
order to cool the outside air (a).
[0032]
Further, lubricating oil circulation passages 70a and 70b
that communicate with the lubricating oil circulation space 14
in order to lead the lubricating oil to the exterior of the
housing 12 are provided, and the lubricating oil circulation
passages 70a and 70b are connected to a third radiator 72 on
the exterior of the housing 12. The third radiator 72 has a
similar configuration to the first radiator 52 and the second
radiator 44, including an outside air intake mechanism and a
heat exchange unit. The third radiator 72 functions to cool
the lubricating oil by taking in the outside air a and performing
heat exchange between the taken-in outside air (a) and the
lubricating oil.
[0033]
A bypass passage 62 is provided between the cooling water
circulation passages 58a, 58b further toward the absorption
chiller 50 side than a connection portion of the cooling water
circulation passages 74a, 74b. A three-way valve 64 is provided
in a bifurcation portion between the cooling water circulation
passage 58a and the bypass passage 62. A temperature sensor
66 that detects a cooling water temperature is provided in the
18
I
cooling water circulation passage 58a. Further, a controller
68 is provided to control an operation of the absorption chiller
50. The controller 68 inputs a detection value from the
temperature sensor 66, and controls the operation of the
absorption chiller 50 on the basis of the detection value.
[0034]
The controller 68 controls a flow rate of the steam
supplied to the absorption chiller 50 by controlling an opening
of the three-way valve 42. Further, by controlling an opening
of the three-way valve 64 in accordance with a load of the
stationary gas engine 10, the controller 68 controls an amount
of cooling water distributed to the cooling water circulation
passage 58a and the bypass passage 62.
[0035]
A fixed amount of cooling water must be supplied to the
low temperature side intake air cooler 30 at 32°C. The
temperature of the cooling water discharged from the low
temperature side intake air cooler 30 is likely to decrease
below 35°C or otherwise vary in accordance with the load of the
stationary gas engine 10. Therefore, when the cooling water
is supplied to the absorption chiller 50 as is, it is difficult
to maintain the temperature of the cooling water supplied to
the low temperature side intake air cooler 30 at 32°C. Hence,
by controlling the opening of the three-way valve 64 using the
19
controller 68 in order to control the amount of cooling water
that bypasses the absorption chiller 50, the flow rate and the
temperature of the cooling water supplied to the low temperature
side intake air cooler 30 can be controlled to fixed levels.
[0036]
By having the controller 68 control the operation of the
absorption chiller 50 on the basis of the detection value from
the temperature sensor 66 and control the three-way valves 42
and 64 in accordance with the load of the stationary gas engine
10 in this manner, the temperature and the flow rate of the
cooling water supplied to the primary intake air cooler 22 and
the low temperature side intake air cooler 30 can be maintained
at fixed levels.
Set temperatures of the outside air (a), the intake air
(s), the exhaust gas (e), the cooling water, and so on in the
respective parts are noted in Fig. 1. In this embodiment, the
temperature of the outside air a is set at 50°C, for example.
[0037]
According to this configuration, the outside air (a) is
suctioned into the primary intake air cooler 22 at 50°C by a
suction force of the compressor 26a. Cooling water at 32°C is
transferred to the primary intake air cooler 22 through the
cooling water circulation passage 74a, and the suctioned
outside air (a) is subjected to heat exchange with the cooling
20
water supplied from the absorption chiller 50 in the primary
intake air cooler 22. As a result, the outside air (a) is
primarily cooled to 40°C. After cooling the outside air (a),
the cooling water is returned to the absorption chiller 50
through the cooling water circulation passages 74b and 58b.
[0038]
The primarily cooled intake air (s) is compressed and
heated to 200°C by the compressor 26a of the turbo charger 26.
The intake air (s) heated to 200°C is secondarily cooled in the
high temperature side intake air cooler 28 by exchanging heat
with cooling water supplied from the second radiator 44. The
secondarily cooled intake air (s) is then tertiarily cooled to
40°C in the low temperature side intake air cooler 30 by
exchanging heat with 32°C cooling water supplied from the
absorption chiller 50 . The intake air (s) subjected to tertiary
cooling to 40°C is supplied to the combustion chamber 13 of the
stationary gas engine 10.
[0039]
The exhaust gas (e) discharged from the combustion
chamber 13 of the stationary gas engine 10 is introduced into
the exhaust heat boiler 34 . Steam is generated by the exhaust
heat boiler 34 using the heat possessed by the exhaust gas (e) .
The steam is supplied to the absorption chiller 50 as a heat
21
source through the pipelines 36 and 38. Cooling water is
supplied to the absorption chiller 50 from the first radiator
52 as a cold source, and the absorption chiller 50 is operated
by the heat source and the cold source. Cooling water is
manufactured at 32°C by the absorption chiller 50, and this
cooling water is transferred to the primary intake air cooler
22 and the low temperature side intake air cooler 30 in order
to cool the intake air s in the primary intake air cooler 22
and the low temperature side intake air cooler 30.
[0040]
The cooling water cooled by the second radiator 44 is
transferred to the cooling water jacket 16 on the downstream
side of the high temperature side intake air cooler 28 in order
to cool the respective parts in the housing 12. Further, the
lubricating oil in the housing 12 is transferred from the
lubricating oil circulation space 14 to the third radiator 72
through the lubricating oil circulation passage 70a and cooled
in the third radiator 72. The lubricating oil cooled by the
third radiator 72 is returned to the lubricating oil circulation
space 14 through the lubricating oil circulation passage 70b.
[0041]
Next, control procedures executed by the controller 68
will be described using a flowchart shown in Fig. 2. In Fig.
2, when the absorption chiller 50 starts to operate (S12),
22
operations of the three-way valves 42 and 64 are controlled in
accordance with a load condition of the stationary gas engine
10, whereby the temperature of the cooling water supplied to
the primary intake air cooler 22 and the low temperature side
intake air cooler 30 is regulated (S14).
[0042]
Next, when the detection value from the temperature
sensor 66, which is input into the controller 68, is within a
set range (A < temperature detection value < B) (S16), the
control is terminated (S18). When the detection value is
outside the set range, the controller 68 controls the operation
of the absorption chiller 50 (S20) such that the detection value
enters the set range.
[0043]
According to this embodiment, the outside air (a)
introduced into the intake air passage 24 is cooled in three
stages in the intake air passage 24 on the upstream side and
the downstream side of the turbo charger 26, and therefore even
outside air (a) having a temperature of 50°C can be supplied
to the combustion chamber 13 of the stationary gas engine 10
at a set temperature of 40°C. Further, cooling water
manufactured by the absorption chiller 50, which uses the heat
possessed by the exhaust gas (e) as a heat source and the outside
air as a cold source and therefore consumes little power, is
23
supplied to the primary intake air cooler 22 and the low
temperature side intake air cooler 30 into which the low
temperature intake air (s) is introduced, and therefore energy
conservation and highly efficient cooling can be achieved
without the need for a specialized heat source.
[0044]
Furthermore, the first radiator 52, the second radiator
44, and the third radiator 72 all use the outside air (a) and
do not require water. Therefore, the radiators 52, 44, 72 can
be operated in a region where water is in short supply. Hence,
the intake air cooling apparatus according to this embodiment
can be operated highly efficiently even in an arid tropical
region where water is valuable and water shortages tend to occur,
and the outside air temperature is high.
[0045]
Moreover, the cooling water supplied to the high
temperature side intake air cooler 28 does not need to be greatly
reduced in temperature, and therefore the second radiator 44
that uses the outside air (a) as a cold source is sufficient.
Further, only the cooling water that is supplied to the primary
intake air cooler 22 and the low temperature side intake air
cooler 30 is cooled by the absorption chiller 50, and therefore
the absorption chiller is sufficient despite having a smaller
cooling capacity than a steam compression chiller. By
24
combining the second radiator 44 and the absorption chiller 50,
energy conservation and highly efficient cooling can be
realized without the need for a specialized energy source.
[0046]
Furthermore, the exhaust heat boiler 34 is provided in
the exhaust gas passage 32 to manufacture steam using the heat
possessed by the exhaust gas (e), and the manufactured steam
is used as the heat source of the absorption chiller 50. Hence,
the heat possessed by the exhaust gas (e) can be recovered
efficiently. The remaining steam may be used as a heat source
for another device.
[0047]
Further, the three-way valve 42 is provided in the
pipeline 36, the bypass passage 62 and the three-way valve 64
are provided in the cooling water circulation passages 58a, 58b,
and the openings of the three-way valves 42 and 64 are controlled
by the controller 68 in accordance with the load condition of
the stationary gas engine 10, and therefore the temperature of
the cooling water supplied to the primary intake air cooler 22
and the low temperature side intake air cooler 30 can be
controlled in accordance with the load of the stationary gas
engine 10.
[0048]
Moreover, the temperature sensor 66 that detects the
25
temperature of the cooling water is provided in the cooling
water circulation passage 58a, and the operation of the
absorption chiller 50 is controlled by the controller 68 on the
basis of the detection valve from the temperature sensor 66 such
that the temperature of the cooling water reaches a target
temperature. Hence, the temperature of the cooling water
supplied to the primary intake air cooler 22 and the low
temperature side intake air cooler 30 can be controlled to a
target value with a high degree of precision.
Furthermore, the temperature of the lubricating oil that
lubricates the interior of the housing 12 can be reduced by the
third radiator 72 that does not use water.
[0049]
Note that in the embodiment described above, the
stationary gas engine 10 is coupled to the power generator 20
via a flywheel, but the stationary gas engine 10 may be coupled
to a pump and a compressor instead of the power generator 20
in order to drive these devices . Further, the present invention
may also be applied to a stationary internal combustion engine
other than a stationary gas engine.
INDUSTRIAL APPLICABILITY
[0050]
According to the present invention, it is possible to
26
realize an intake air cooling apparatus for a stationary
internal combustion engine with which energy can be conserved
and a high degree of cooling efficiency can be achieved, and
which is therefore suitable for use in a region where water is
valuable and an air temperature is high.
27

CLAIMS
1. An intake air cooling apparatus for a stationary internal
combustion engine in which a turbo charger is provided in an
intake air passage and an exhaust gas passage, comprising:
a first intake air cooler provided in the intake air
passage on an upstream side of a compressor forming the turbo
charger in order to perform primary cooling on intake air;
a second intake air cooler for performing secondary
cooling on the intake air on an outlet side of the compressor
after the intake air is compressed and heated by the compressor;
an absorption chiller that uses heat possessed by exhaust
gas from the stationary internal combustion engine as a heat
source and supplies cooling water for cooling the intake air
to the first intake air cooler and the second intake air cooler;
and
a heat exchanger that cools cooling water by performing
heat exchange between the cooling water and outside air and
supplies the cooling water to the absorption chiller as a cold
source,
wherein intake air supplied to a combustion chamber of
the stationary internal combustion engine is cooled by the first
intake air cooler and the second intake air cooler.
2. The intake air cooling apparatus for a stationary
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internal combustion engine according to claim 1, wherein the
second intake air cooler is constituted by a high temperature
side intake air cooler that cools the high temperature intake
air compressed by the turbo charger, and a low temperature side
intake air cooler that further cools the intake air cooled by
the high temperature side intake air cooler and then supplies
the cooled intake air to a cylinder,
a second heat exchanger is provided to supply cooling
water that has been cooled by exchanging heat with outside air,
to the high temperature side intake air cooler, and
cooling water is supplied to the low temperature side
intake air cooler from the absorption chiller, while the cooling
water used for intake air cooling in the high temperature side
intake air cooler is returned to the second heat exchanger
through a cooling water jacket of the stationary internal
combustion engine.
3. The intake air cooling apparatus for a stationary
internal combustion engine according to claim 1 or 2, further
comprising:
an exhaust gas boiler provided in the exhaust gas passage
of the stationary internal combustion engine; and
a steam supply passage that supplies at least a part of
steam obtained in the exhaust gas boiler to the absorption
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f
chiller,
wherein the steam is supplied as a heat source of the
absorption chiller.
4. The intake air cooling apparatus for a stationary
internal combustion engine according to claim 1 or 2, further
comprising:
a cooling water circulation passage that circulates the
cooling water between the absorption chiller and either the
second intake air cooler or the low temperature side intake air
cooler;
a bypass passage that is connected between an outward
passage and a return passage of the cooling water circulation
passage in order to return the cooling water that has been
subjected to heat exchange with the intake air compressed and
heated by the turbo charger and has been discharged from the
second intake air cooler or the low temperature side intake air
cooler, to the second intake air cooler or the low temperature
side intake air cooler without passing through the absorption
chiller;
a valve mechanism capable of varying a flow rate of the
cooling water flowing through the bypass passage; and
a controller that controls the valve mechanism such that
a temperature of the cooling water supplied to the absorption
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f
chiller is controlled in accordance with a load of the
stationary internal combustion engine.
5. The intake air cooling apparatus for a stationaryinternal
combustion engine according to claim 1 or 2, further
comprising:
a temperature sensor that detects a temperature of the
cooling water supplied from the absorption chiller to the second
intake air cooler or the low temperature side intake air cooler;
and
a controller that controls an operation of the absorption
chiller such that a detection value of the temperature sensor
reaches a target value.
6. The intake air cooling apparatus for a stationary
internal combustion engine according to claim 1 or 2, further
comprising:
a third heat exchanger that performs heat exchange
between the outside air and lubricating oil that circulates
through a lubricating oil space formed in a housing of the
stationary internal combustion engine in order to cool the
lubricating oil; and
a lubricating oil circulation passage that communicates
with the lubricating oil space in order to lead the lubricating
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oil to the third heat exchanger.