KR102059861B1 - Thermal energy recovery system and detection unit - Google Patents

Abstract

It is to provide a thermal energy recovery system capable of suppressing the occurrence of erroneous detection and corrosion of the sensor capable of detecting the working medium.
A heat energy recovery system, comprising: an evaporator (31), an expander (32), a power recoverer (33), which evaporates the working medium by heat exchange of the engine (10), the supercharger (20), the boost air and the working medium; And a condenser 34, a pump 35, a circulation passage 36, and a detection unit 40 capable of detecting leakage of the working medium in the evaporator 31, and the detection unit 40 includes an evaporator. A discharge passage 41 for extracting a part of the boost air between the 31 and the engine 10, a drain trap 44 provided in the discharge passage 41, and a drain trap 44 among the discharge passage 41; It is provided with the sensor 45 provided in the upstream part rather than being able to detect a working medium.

Description

Thermal energy recovery system and detection unit {THERMAL ENERGY RECOVERY SYSTEM AND DETECTION UNIT}

The present invention relates to a thermal energy recovery system.

Conventionally, a heat energy recovery system for recovering heat of boost air supplied to an engine from a turbocharger is known. For example, Patent Literature 1 discloses a heat recovery system (thermal energy recovery system) having an engine, a turbocharger having a turbine and a compressor, and a heat recovery system for recovering heat of boost air supplied from the supercharger to the engine. It is. The turbine is driven by the exhaust gas discharged from the engine. The compressor is connected to the turbine and discharges the above charged air. The heat recovery apparatus includes an evaporator for evaporating the working medium, an expander, a power recovery unit, a condenser, and a pump. An evaporator is provided in the intake line which connects the compressor of a supercharger and an engine. That is, in the heat recovery apparatus, in the evaporator, the working medium receives heat from the charge air before being supplied to the engine, and this thermal energy is recovered by the power recovery unit through the expander.

Japanese Patent Publication No. 2015-200182

In the thermal energy recovery system as described in Patent Document 1, when a so-called fin tube type is used as the evaporator, when the working medium leaks from the heat transfer tube (tube) in the evaporator, the working medium flows into the engine. In order to detect this leak, it is conceivable to provide a sensor capable of detecting a leak of the working medium in the evaporator. However, a drain is generated in the evaporator, and since the drain contains components other than the working medium (such as a sulfur component contained in the exhaust gas sucked into the compressor), the sensor comes into contact with the drain so that the sensor may be misdetected or corroded. There is concern about the occurrence.

It is an object of the present invention to provide a heat energy recovery system and a detection unit capable of suppressing the occurrence of false detection and corrosion of a sensor capable of detecting a working medium.

In order to achieve the above object, the present invention provides a turbocharger having an engine, a turbine driven by exhaust gas discharged from the engine, and a compressor connected to the turbine and for discharging boost air for supplying the engine; An evaporator for evaporating the working medium by heat exchanging working air with the charge air discharged from the compressor, an expander for expanding the working medium discharged from the evaporator, a power recovery unit connected to the expander, and an operation discharged from the expander A condenser for condensing the medium, a pump for sending the working medium discharged from the condenser to the evaporator, a circulation flow path for connecting the evaporator, the power recovery unit, the condenser, and the pump in this order; A detection unit capable of detecting leakage of the working medium, The detection unit includes a discharge passage for discharging a part of the boost air between the evaporator and the engine, a drain trap provided in the discharge passage, and allowing liquid to pass and prohibiting passage of gas; A heat energy recovery system is provided at a portion upstream from the drain trap in the discharge flow passage and has a sensor capable of detecting the working medium.

In this heat energy recovery system, since the sensor is provided in the upstream part of the discharge flow path rather than the drain trap, the contact of the liquid (water or the like) containing components other than the working medium is suppressed. Therefore, misdetection of a sensor and generation | occurrence | production of corrosion are suppressed.

In this case, it is preferable that the sensor is disposed above the drain trap.

In this way, when a certain amount (concentration) of the working medium is accumulated in the portion between the drain trap and the sensor in the discharge flow path, it is detected by the sensor, so that false detection is more reliably suppressed.

Moreover, it is preferable that the said extraction flow path has a fuel flow path in which the said drain trap was provided, and the branch flow path branched from the said fuel flow path, and the said sensor was provided.

In this case, since the boosted air from which moisture has been removed flows into the branch flow path, false detection of the sensor and occurrence of corrosion are more reliably suppressed.

In this case, it is preferable that the said detection unit further has a dryer provided in the connection part of the said oil passage and the said branch flow path, and removes the water contained in the said boost air.

In this way, contact of the liquid (water or the like) containing components other than the working medium to the sensor is more reliably suppressed.

In addition, the sensor preferably includes a semiconductor sensor capable of detecting moisture, the working medium, carbon monoxide, hydrogen sulfide and ammonia, and an infrared sensor capable of detecting moisture, the working medium, carbon monoxide, carbon dioxide, sulfur dioxide and nitrogen oxides.

In this aspect, the detection accuracy of the working medium is increased. Specifically, both the semiconductor sensor and the infrared sensor detect moisture, but since the moisture is substantially removed by the drain trap, when the detection signal is output from both the semiconductor sensor and the infrared sensor, the gas detected by these sensors Can be determined to be the working medium.

Here, both the semiconductor sensor and the infrared sensor detect carbon monoxide. For this reason, it is preferable that the said detection unit further has a carbon monoxide removal part which is provided in the site | part between the said water removal mechanism and the said sensor in the said extraction flow path, and can remove carbon monoxide.

In this way, the detection accuracy of the working medium by the sensor is further increased.

The present invention also provides a supercharger having an engine, a turbine driven by exhaust gas discharged from the engine, and a compressor connected to the turbine, the compressor for discharging boost air for supplying the engine, and the boost air discharged from the compressor. An evaporator for evaporating the working medium by heat exchanging a working medium, an expander for expanding the working medium discharged from the evaporator, a power recoverer connected to the expander, and a condenser for condensing the working medium discharged from the expander; A pump for sending the working medium discharged from the condenser to the evaporator, a circulation passage connecting the evaporator, the power recovery unit, the condenser, and the pump in this order, and leaking of the working medium in the evaporator. A detection unit that can be detected, wherein the detection unit is configured to An outgoing flow path for extracting a part of the boost air between the machine and the engine, a water removal mechanism provided in the outgoing flow path and removing moisture contained in the boost air introduced into the outgoing flow path, and among the outgoing flow paths. It is provided in the site | part downstream of the said water removal mechanism, and provides the heat energy recovery system which has a sensor which can detect the said working medium.

In the heat energy recovery system, since the sensor is provided at a portion downstream from the water removal mechanism in the discharge flow path, contact of the liquid (water or the like) containing components other than the working medium to the sensor is suppressed. Therefore, misdetection of a sensor and generation | occurrence | production of corrosion are suppressed.

Specifically, it is preferable that the water removal mechanism has a dryer for removing water contained in the boost air.

In this way, moisture is effectively removed by the dryer.

In this case, the detection unit further has a discharge flow path for discharging the water removed by the dryer, and a drain trap provided in the discharge flow path and allowing the passage of liquid and preventing the passage of gas. It is preferable.

In this way, since the water removed by the dryer is discharged from the dryer through the discharge flow path, the thermal energy recovery system can be continuously operated.

In addition, the sensor preferably includes a semiconductor sensor capable of detecting moisture, the working medium, carbon monoxide, hydrogen sulfide and ammonia, and an infrared sensor capable of detecting moisture, the working medium, carbon monoxide, carbon dioxide, sulfur dioxide and nitrogen oxides.

In this case, it is preferable that the said detection unit further has the carbon monoxide removal part which is provided in the site | part between the said water removal mechanism and the said sensor in the said extraction flow path, and can remove carbon monoxide.

Moreover, in the said heat energy recovery system, it is preferable that the said discharge flow path has a hole for forming the flow of the boost air toward the said sensor from the edge part of the upstream of the said discharge flow path.

In this case, since the flow of the boost air toward the sensor is formed from the upstream end of the discharge flow path, the detection accuracy by the sensor is increased.

In the heat energy recovery system, a first on-off valve provided at a portion between the condenser and the evaporator in the circulation flow path, a second on / off valve provided at a portion between the evaporator and the expander in the circulation flow path; Preferably, the sensor further includes a control unit for closing the first on-off valve and the second on-off valve when the sensor detects the working medium.

In this case, when the leak of the working medium is detected by the sensor, the evaporator is separated from the circulation flow path, so that the leak of the working medium from the evaporator is suppressed.

In addition, the present invention is a detection unit capable of detecting the leakage of the working medium in the evaporator for evaporating the working medium by heat-exchanging the working medium with the charge air supplied to the engine from the supercharger, between the evaporator and the engine. A discharge passage for discharging a part of the supercharged air, a drain trap disposed in the discharge passage, allowing a liquid to pass and prohibiting passage of gas, and a discharge trap disposed upstream of the discharge passage; And a detecting unit having a sensor capable of detecting the working medium.

The detection unit can be connected between the evaporator and the engine to detect leakage of the working medium from the evaporator. In addition, in the detection unit, a sensor is provided upstream than the drain trap in the discharge flow path. The contact of the liquid (water or the like) containing components other than the working medium is suppressed. Therefore, misdetection of a sensor and generation | occurrence | production of corrosion are suppressed.

In addition, the present invention is a detection unit capable of detecting the leakage of the working medium in the evaporator for evaporating the working medium by heat-exchanging the working medium with the charge air supplied to the engine from the supercharger, between the evaporator and the engine. A discharge passage for discharging a part of the supercharged air, a moisture removal mechanism provided in the discharge passage, for removing water introduced into the discharge passage, and a portion downstream of the portion where the moisture removal mechanism is provided in the discharge passage. It is provided in the site | part, and the detection unit which has the sensor which can detect the said working medium is provided.

Also in this detection unit, the effect similar to the above is acquired.

As described above, according to the present invention, it is possible to provide a heat energy recovery system and a detection unit capable of suppressing the erroneous detection of a sensor capable of detecting the working medium and the occurrence of corrosion.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows roughly the structure of the heat energy recovery system of 1st Embodiment of this invention.
It is a figure which shows roughly the structure of the heat energy recovery system of 2nd Embodiment of this invention.
3 is a diagram schematically showing a modification of the heat energy recovery system according to the second embodiment of the present invention.
4 is a diagram schematically showing a modification of the heat energy recovery system of the first embodiment.
It is a figure which shows roughly the structure of the heat energy recovery system of 3rd embodiment of this invention.
It is a figure which shows roughly the structure of the heat energy recovery system of 4th Embodiment of this invention.
It is a figure which shows roughly the modification of the heat energy recovery system of 4th Embodiment of this invention.
8 is a diagram schematically showing a modification of the water removal mechanism.
9 is a diagram schematically showing a modification of the connection position of the detection unit.

Preferred embodiments of the present invention will be described below with reference to the drawings.

(1st embodiment)

The heat energy recovery system of the first embodiment of the present invention will be described with reference to FIG. 1. The heat energy recovery system includes an engine 10, a supercharger 20, a heat energy recovery unit 30, and a detection unit 40.

The supercharger 20 has a turbine 21 driven by exhaust gas discharged from the engine 10, and a compressor 22 connected to the turbine 21 and discharging the supercharged air for supplying the engine 10. . The boost air discharged from the compressor 22 is supplied to the engine via the intake line 11 which connects the compressor 22 and the engine. The exhaust gas discharged from the engine 10 is supplied to the turbine 21 through the exhaust line 12 which connects the engine 10 and the turbine 21.

In this embodiment, the air cooler 15 is provided in the intake line 11. The air cooler 15 cools the boost air supplied to the engine 10 with a cooling medium (sea water or the like). In this embodiment, what is called a fin tube type is used as the air cooler 15.

The thermal energy recovery unit 30 includes an evaporator 31, an expander 32, a power recoverer 33, a condenser 34, a pump 35, an evaporator 31, an expander 32, and a condenser. The circulation flow path 36 which connects the 34 and the pump 35 in this order, the 1st switching valve V1, the 2nd switching valve V2, and the control part 38 are provided.

The evaporator 31 is provided in the portion between the compressor 22 and the air cooler 15 of the intake line 11. The evaporator 31 has a charge medium discharged from the compressor 22 (supplied to the engine 10) and a working medium having a boiling point lower than that of the air and having a specific gravity larger than that of the air (for example, The working medium is evaporated by heat exchange of R245fa). In the present embodiment, what is called a fin tube type is used as the evaporator 31. That is, the evaporator 31 has the heat exchanger tube 31a through which a working medium flows, and the casing 31b which accommodates the heat exchanger tube 31a. In the evaporator 31, the working medium in the heat transfer pipe 31a is evaporated in the course of passing the boost air discharged from the compressor 22 into the casing 31b.

The expander 32 is provided in the downstream part of the evaporator 31 of the circulation flow path 36. The expander 32 expands the gaseous working medium flowing out of the evaporator 31. In this embodiment, as the expander 32, a volumetric screw expander having a rotor that is rotationally driven by the expansion energy of the gaseous working medium is used.

The power recovery unit 33 is connected to the expander 32. The power recovery unit 33 recovers power from the working medium by rotating with the driving of the expander 32. In this embodiment, a generator is used as the power recovery unit 33. In addition, a compressor or the like may be used as the power recovery unit 33.

The condenser 34 is provided at a portion downstream of the expander 32 in the circulation passage 36. The condenser 34 condenses the working medium by heat exchanging the working medium discharged from the expander 32 and the cooling medium (sea water, etc.).

The pump 35 is provided in the downstream part of the condenser 34 (part between the condenser 34 and the evaporator 31) among the circulation flow paths 36. The pump 35 sends the working medium of the liquid phase discharged from the condenser 34 to the evaporator 31.

The 1st opening-closing valve V1 is provided in the site | part between the condenser 34 and the evaporator 31 among the circulation flow paths 36. More specifically, the 1st open / close valve V1 is provided in the site | part between the condenser 34 and the pump 35 among the circulation flow paths 36. The 2nd opening-closing valve V2 is provided in the site | part between the evaporator 31 and the expander 32 among the circulation flow paths 36. Each on-off valve V1, V2 is comprised so that opening and closing is possible.

The control part 38 controls opening / closing of the 1st switching valve V1, opening / closing of the 2nd switching valve V2, and the pump 35. FIG. The control content of the control part 38 is mentioned later.

The detection unit 40 is a unit capable of detecting the leakage of the working medium in the evaporator 31. The detection unit 40 has a discharge passage 41, a drain trap 44, and a sensor 45.

The discharge flow path 41 is a flow path which discharges a part of the boost air between the evaporator 31 and the engine 10. The connection part 42a is provided in the end of the extraction flow path 41. FIG. This connecting portion 42a is connected to the lower part of the casing 31b of the evaporator 31. The extraction flow path 41 has a flow path 42 in which the connection part 42a was formed in the one end (edge part of an upstream), and the branch flow path 43 branched from the middle part of the flow path 42. As shown in FIG. The downstream end of the oil passage 42 is located below the end of the upstream side of the oil passage 42. The downstream end of the branch flow passage 43 is located above the downstream end of the oil passage 42. At an end portion on the downstream side of the branch flow passage 43, a hole 43h is formed for forming a flow of boost air from the oil passage 42 toward the end portion on the downstream side of the branch flow passage 43.

The drain trap 44 is provided in the discharge flow path 41. Specifically, the drain trap 44 is provided in the site | part downstream of the flow path 42 rather than the connection part of the said flow path 42 and the branch flow path 43. The drain trap 44 allows the passage of liquids and also prohibits the passage of gases.

The sensor 45 can detect the working medium. This sensor 45 is provided in the upstream side of the drain flow path 41 rather than the drain trap 44. Specifically, the sensor 45 is provided at the downstream end of the branch flow passage 43. The sensor 45 is provided above the drain trap 44. The sensor 45 outputs a detection value according to the concentration of the working medium.

Here, the control part 38 is demonstrated. The control unit 38 closes the first on-off valve V1 and the second on-off valve V2 when the sensor 45 detects the working medium. More specifically, the control part 38 is the first when the detection value of the sensor 45 becomes above the threshold value (when the density | concentration of the working medium which leaked out from the heat exchanger tube 31a of the evaporator 31 became more than a reference value). The on-off valve V1 and the second on-off valve V2 are closed. The control part 38 may close the on-off valves V1 and V2 and stop the pump 35.

As described above, in the heat energy recovery system of the present embodiment, since the sensor 45 is provided in the upstream portion of the discharge flow path 41 than the drain trap 44, the sensor 45 operates. Contact of liquids (water or the like) containing components other than the medium is suppressed. Therefore, the misdetection of the sensor 45 and generation | occurrence | production of corrosion are suppressed.

In addition, since the sensor 45 is disposed above the drain trap 44, when a certain amount (concentration) of the working medium is accumulated in a portion between the drain trap 44 and the sensor 45 in the discharge flow path 41. It is detected by the sensor 45. Therefore, false detection is suppressed more reliably.

In addition, since the branch flow passage 43 has a hole 43h, a flow of boost air from the main flow passage 42 toward the sensor 45 is formed. Therefore, the detection accuracy by the sensor 45 becomes high.

In addition, since the control part 38 closes the 1st switching valve V1 and the 2nd switching valve V2 when the detection value of the sensor 45 becomes more than a threshold value, ie, the evaporator 31 is isolate | separated from the circulation flow path 36, The leakage of the working medium from the evaporator 31 is suppressed.

(2nd embodiment)

Next, the heat energy recovery system of the second embodiment of the present invention will be described with reference to FIG. 2. In addition, in 2nd Embodiment, only a part different from 1st Embodiment is demonstrated, and description of the structure, operation | movement, and effect similar to 1st Embodiment is abbreviate | omitted.

In the present embodiment, the configuration of the detection unit 40 is different from that of the first embodiment. Specifically, the detection unit 40 of the present embodiment has a discharge passage 41, a sensor 45, and a water removal mechanism 46. In this embodiment, a dryer (hereinafter referred to as "dryer 46") is employed as the water removal mechanism 46.

The discharge passage 41 is connected to a portion between the evaporator 31 and the air cooler 15 of the intake line 11.

The dryer 46 is provided in the extraction flow path 41. The dryer 46 removes moisture contained in the boost air flowing through the discharge flow path 41. As the dryer 46, what is called an air dryer, a membrane dryer, an adsorption type dryer, etc. are mentioned. The air dryer is a device that returns the boost air to room temperature after removing the moisture generated by cooling the boost air. The membrane drier is a device having a hollow fiber membrane containing a polymer. The hollow fiber membrane allows the moisture contained in the boost air introduced into the hollow fiber membrane to pass through the hollow fiber membrane and allows passage of the boost air. An adsorption-type drier is an apparatus which removes the water contained in boost air by letting air flow through porous media, such as a silica gel.

The sensor 45 is provided in the downstream side of the discharge flow path 41 rather than the dryer 46.

As mentioned above, in the heat energy recovery system of this embodiment, since the sensor 45 is provided in the downstream part of the discharge flow path 41 rather than the dryer 46, the sensor 45 other than a working medium is provided. The contact of the liquid (water, etc.) containing a component is suppressed. Therefore, also in this embodiment, the misdetection of the sensor 45 and generation | occurrence | production of corrosion are suppressed.

In addition, as illustrated in FIG. 3, the detection unit 40 further includes a discharge passage 47 for discharging water removed by the dryer 46 and a drain trap 48 provided in the discharge passage 47. You may have it.

In this embodiment, since the water removed by the dryer 46 is discharged from the dryer 46 via the discharge passage 47, the operation of the heat energy recovery system can be continued.

(Third embodiment)

Next, the heat energy recovery system of the third embodiment of the present invention will be described with reference to FIG. 5. In addition, in 3rd Embodiment, only a part different from 1st Embodiment is demonstrated, and description of the structure, operation | movement, and effect similar to 1st Embodiment is abbreviate | omitted.

In the present embodiment, the sensor 45 includes a semiconductor sensor 45a and an infrared sensor 45b. The semiconductor sensor 45a and the infrared sensor 45b are provided in the upstream part of the branch flow path 43 rather than the hole 43h. The semiconductor sensor 45a detects the change in the resistance value generated when the metal oxide semiconductor comes into contact with the gas as the gas concentration. This semiconductor sensor 45a detects moisture, carbon monoxide, hydrogen sulfide and ammonia in addition to the working medium. The infrared sensor 45b detects the concentration of the gas based on the amount of infrared rays irradiated from the light emitting portion (light source) toward the light receiving portion by the gas existing between the light emitting portion and the light receiving portion. In addition to the working medium, this infrared sensor 45b detects moisture, carbon monoxide, carbon dioxide, sulfur dioxide and nitrogen oxides.

Although both the semiconductor sensor 45a and the infrared sensor 45b detect moisture, in the present embodiment, since the water is substantially removed by the drain trap 44, the semiconductor sensor 45a and the infrared sensor 45b are not. When the detection signal is output from both sides, it can be determined that the gas detected by these sensors 45a and 45b is a working medium. Therefore, in this embodiment, the detection accuracy of the working medium is increased. In addition, although both the semiconductor sensor 45a and the infrared sensor 45b detect carbon monoxide, since the density | concentration of carbon monoxide in supercharged air is very low, the fear of false detection can be ignored.

For this reason, in this embodiment, when the control part 38 receives a detection signal from both the semiconductor sensor 45a and the infrared sensor 45b, it closes the 1st switching valve V1 and the 2nd switching valve V2.

(4th embodiment)

Next, the heat energy recovery system of the fourth embodiment of the present invention will be described with reference to FIG. 6. In addition, in 4th Embodiment, only a part different from 2nd Embodiment is demonstrated, and description of the structure, effect | action, and effect similar to 1st Embodiment is abbreviate | omitted.

Also in this embodiment, the sensor 45 includes the semiconductor sensor 45a and the infrared sensor 45b. The semiconductor sensor 45a and the infrared sensor 45b are provided in the upstream part of the branch flow path 43 rather than the hole 43h. For this reason, in this embodiment, the detection accuracy of a working medium becomes high compared with 2nd Embodiment.

In addition, also in this embodiment, when the control part 38 receives the detection signal from both the semiconductor sensor 45a and the infrared sensor 45b similarly to 3rd embodiment, the 1st opening / closing valve V1 and 2nd opening / closing are received. Close valve V2.

In addition, as illustrated in FIG. 7, the detection unit 40 further includes a carbon monoxide removal unit 49 installed at a portion between the dryer 46 and the sensor 45 in the discharge passage 41 and capable of removing carbon monoxide. You may have it. In this aspect, the detection accuracy of the working medium by the sensor 45 is further increased. In addition, in the third embodiment, the carbon monoxide removing unit 49 may be provided at a portion on the upstream side of each of the sensors 45a and 45b in the branch passage 43. The carbon monoxide removing unit 49 may be provided with a drain trap for the purpose of recovering it when the drain water is contained.

In addition, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the description of the above embodiments but by the claims, and includes the meanings of the claims and equivalents and all modifications within the scope.

For example, in 1st Embodiment, as shown in FIG. 4, the dryer 46 may be provided in the connection part of the gas flow path 42 and the branch flow path 43. As shown in FIG.

In addition, in the fourth embodiment, as shown in FIG. 8, the water removing mechanism 46 is branched so as to extend downward from the discharge passage 41 so that the water (liquid) is downward from the discharge passage 41. It may be a liquid discharge passage capable of discharging. This also applies to the forms shown in FIGS. 2 and 3.

In addition, as shown in FIG. 9, the upstream end of the discharge passage 41 may be connected to a portion between the air cooler 15 and the engine 10 in the intake line 11. Alternatively, the upstream end of the outlet flow passage 41 may be connected to a lower portion of the casing of the air cooler 15 or to a portion of the intake line 11 between the evaporator 31 and the air cooler 15.

In addition, the 1st opening / closing valve V1 may be provided in the site | part between the pump 35 and the evaporator 31 among the circulation flow paths 36.

10: engine
20: supercharger
21: turbine
22: compressor
30: heat energy recovery unit
31: evaporator
31a: heat pipe
31b: casing
32: Inflator
33: power recovery
34: condenser
35 pump
36: circulation flow path
38: control unit
40: detection unit
41: departure euro
42: fueling path
42a: connection
43: quarter euro
43h: hole
44: drain trap
45 sensor
45a: semiconductor sensor
45b: infrared sensor
46: water removal mechanism (dryer, liquid discharge flow path)
47: discharge passage
48: drain trap
49: carbon monoxide removal unit
V1: first on-off valve
V2: second on-off valve

Claims (15)

Engine,
A supercharger having a turbine driven by exhaust gas discharged from the engine, and a compressor connected to the turbine, the compressor discharging boost air for supplying the engine;
An evaporator for evaporating the working medium by heat exchanging the working medium with the charge air discharged from the compressor,
An expander for expanding the working medium discharged from the evaporator;
A power recovery unit connected to the inflator,
A condenser for condensing the working medium discharged from the expander;
A pump for sending the working medium discharged from the condenser to the evaporator,
A circulation passage for connecting the evaporator, the power recovery unit, the condenser, and the pump in this order;
A detection unit capable of detecting leakage of the working medium in the evaporator,
The detection unit,
A discharge flow path for extracting a part of the boost air between the evaporator and the engine;
A drain trap provided in the discharge flow path and allowing liquid to pass therethrough and preventing gas from passing therethrough;
It is provided in the upstream part of the said discharge flow path rather than the said drain trap, and has a sensor which can detect the said working medium,
The sensor,
A semiconductor sensor capable of detecting moisture, the working medium, carbon monoxide, hydrogen sulfide and ammonia,
And an infrared sensor capable of detecting moisture, the working medium, carbon monoxide, carbon dioxide, sulfur dioxide and nitrogen oxides. The method of claim 1,
The sensor is a heat energy recovery system disposed above the drain trap. The method according to claim 1 or 2,
The discharge passage is,
An oil supply passage in which the drain trap is installed;
A heat energy recovery system, which is branched from the oil supply passage and has a branch passage provided with the sensor. The method of claim 3,
The detection unit further includes a water removal mechanism provided at a connection portion between the oil supply passage and the branch flow passage and removing water contained in the boost air. delete The method of claim 4, wherein
The detection unit further includes a carbon monoxide removal unit provided at a portion between the water removal mechanism and the sensor in the discharge passage and capable of removing carbon monoxide. Engine,
A supercharger having a turbine driven by exhaust gas discharged from the engine, and a compressor connected to the turbine, the compressor discharging boost air for supplying the engine;
An evaporator for evaporating the working medium by heat exchanging the working medium with the charge air discharged from the compressor,
An expander for expanding the working medium discharged from the evaporator;
A power recovery unit connected to the inflator,
A condenser for condensing the working medium discharged from the expander;
A pump for sending the working medium discharged from the condenser to the evaporator,
A circulation passage connecting the evaporator, the power recovery unit, the condenser, and the pump in this order;
A detection unit capable of detecting leakage of the working medium in the evaporator,
The detection unit,
A discharge flow path for extracting a part of the boost air between the evaporator and the engine;
A water removal mechanism installed in the discharge flow path and removing moisture contained in the boost air introduced into the discharge flow path;
It is provided in the part downstream from the said water removal mechanism of the said extraction flow path, and has a sensor which can detect the said operation medium,
The sensor,
A semiconductor sensor capable of detecting moisture, the working medium, carbon monoxide, hydrogen sulfide and ammonia,
And an infrared sensor capable of detecting moisture, the working medium, carbon monoxide, carbon dioxide, sulfur dioxide and nitrogen oxides. The method of claim 7, wherein
The said water removal mechanism is a heat energy recovery system which has a dryer which removes the water contained in the said boost air. The method of claim 8,
The detection unit,
A discharge flow path for discharging water removed by the dryer;
And a drain trap installed in said discharge flow path, said drain trap permitting passage of liquid and prohibiting passage of gas. delete The method according to any one of claims 7 to 9,
The detection unit further includes a carbon monoxide removal unit provided at a portion between the water removal mechanism and the sensor in the discharge passage and capable of removing carbon monoxide. The method according to any one of claims 1, 2, 7 to 9,
The discharge flow passage has a hole for forming a flow of the boost air toward the sensor from an end on the upstream side of the discharge passage. The method according to any one of claims 1, 2, 7 to 9,
A first opening / closing valve provided at a portion between the condenser and the evaporator in the circulation passage;
A second opening / closing valve provided at a portion between the evaporator and the expander in the circulation passage;
And a control unit for closing the first on-off valve and the second on-off valve when the sensor detects the working medium. A detection unit capable of detecting leakage of the working medium in an evaporator which evaporates the working medium by heat exchanging working air with the charge air supplied to the engine from the supercharger,
A discharge flow path for extracting a part of the boost air between the evaporator and the engine;
A drain trap provided in the discharge flow path and allowing liquid to pass therethrough and preventing gas from passing therethrough;
It is provided upstream from the said drain trap among the said discharge flow paths, and has a sensor which can detect the said working medium,
The sensor,
A semiconductor sensor capable of detecting moisture, the working medium, carbon monoxide, hydrogen sulfide and ammonia,
And an infrared sensor capable of detecting moisture, the working medium, carbon monoxide, carbon dioxide, sulfur dioxide and nitrogen oxides. A detection unit capable of detecting leakage of the working medium in an evaporator which evaporates the working medium by heat exchanging working air with the charge air supplied to the engine from the supercharger,
A discharge flow path for extracting a part of the boost air between the evaporator and the engine;
A water removal mechanism installed in the discharge flow path and removing moisture introduced into the discharge flow path;
It is provided in the downstream part rather than the site | part in which the said water removal mechanism was installed among the said discharge flow paths, and has a sensor which can detect the said working medium,
The sensor,
A semiconductor sensor capable of detecting moisture, the working medium, carbon monoxide, hydrogen sulfide and ammonia,
And an infrared sensor capable of detecting moisture, the working medium, carbon monoxide, carbon dioxide, sulfur dioxide and nitrogen oxides.

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