JP2012147567A - Power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation system which suppresses temperature increase in a power generator body while suppressing leakage of a working medium into the air.SOLUTION: An expander body 30 and a generator body 40 are housed in a housing 50 being connected with each other, and a partition wall part 56, partitioning the interior of the housing 50 into a first space 51a in which the expander body 30 is housed and a second space 54a in which the generator body 40 is housed, is provided in the housing 50. A vapor leading part 56b, which connects the first space 51a and the second space 54a and leads vapor expanded in the first space 51a into the second space 54a, is provided in the partition wall part 56. Further, an injector, which injects a liquid working medium discharged from a condenser to an outlet on the second space 54a side of the vapor leading part 56b, is provided in the partition wall part 56.

Description

  The present invention relates to a power generation system including a power generation device that generates power using steam.

  Conventionally, as a power generation system for recovering power from low-temperature waste heat, a working medium having a low boiling point is evaporated by waste heat, and the expander body is driven to rotate by the steam of the working medium. Accordingly, a binary power generation system that generates power by rotating a generator body is known.

  Further, in such a power generation system, in order to suppress leakage of the working medium into the atmosphere, a so-called hermetic type housed in a common casing in a state where the expander body and the generator body are connected to each other. A system (also called semi-enclosed) is being developed. In the case where the expander main body and the generator main body are housed in separate casings and their connecting portions extend into and out of the respective casings through openings formed in the respective casings, There is a risk that the working medium leaks from the inside of the housing on the machine body side through the gap between the opening and the connecting portion into the atmosphere outside the housing. And the expander main body are coupled and housed in a common housing, the leakage of the working medium into the atmosphere outside the housing is suppressed. However, this hermetic power generation system has a problem that it becomes difficult to cool the generator main body alone and power generation efficiency deteriorates.

  On the other hand, in Patent Document 1, the generator main body includes a rotor connected to the expander main body and a stator disposed around the rotor, and the generator main body includes the rotor. There is disclosed a power generation system in which only a rotor is accommodated in the casing, and a stator of the generator body is disposed outside the casing.

  In this power generation system, since the stator is disposed outside the casing, the stator can be cooled relatively easily.

Japanese Patent Laid-Open No. 5-98902

  In the conventional power generation system disclosed in Patent Document 1, only the stator of the generator main body is housed in a housing, and the stator and the rotor are isolated by the outer wall of the housing. . Therefore, a portion of the outer wall of the housing that separates the stator and the rotor must be made of an amorphous semi-magnetic material so that electric energy is generated by the stator with the rotation of the rotor. However, the structure is complicated and the cost is disadvantageous.

  The present invention has been made in order to solve the above-described problems, and has an object of generating power generation efficiency by cooling the generator main body while suppressing leakage of the working medium to the atmosphere or the like with a simple structure. It is to provide a power generation system that can maintain high power.

  In order to achieve the above object, a power generation system according to the present invention performs power generation using an evaporator that generates a vapor by evaporating a liquid working medium with a predetermined heat source, and the vapor generated by the evaporator. A power generation device, a condenser for condensing steam used for power generation in the power generation device to generate a liquid working medium supplied to the evaporator, and a liquid working medium discharged from the condenser A cooling medium supply device for supplying power to the power generation device, wherein the power generation device is connected to the expander main body and connected to the expander main body, and is connected to the expander main body. A generator main body that rotates as the motor rotates, and a housing that accommodates the expander main body and the generator main body in a state where they are connected to each other, the housing accommodating the expander main body. The first space and the power generation A partition wall partitioning a second space in which the main body is accommodated, wherein the partition wall communicates the first space and the second space, and the steam expanded in the first space is the second space. And a connecting portion accommodating portion for accommodating a connecting portion between the expander main body and the generator main body, and the casing sucks the vapor from the evaporator. A suction section for supplying the steam to the expander body; and an outflow section for allowing the steam that has cooled the generator body in the second space to flow out to the condenser side. Is a cooling line for connecting the downstream side of the condenser and the housing to guide the liquid working medium discharged from the condenser to the housing side, and the liquid state guided by the cooling line. An injection device capable of injecting the working medium into the second space, Injector injects liquid working medium guided by said cooling line toward the vicinity of the outlet of the second space side of the vapor outlet part.

  In this power generation system, the expander main body and the generator main body are housed in a common casing in a connected state. Therefore, it is possible to prevent the working medium supplied to the expander body from leaking out of the casing from around the connecting portion between the expander body and the generator body.

  In addition, since the first space in which the expander main body is accommodated and the second space in which the generator main body is accommodated are communicated by the steam deriving portion, the first portion of the first space is communicated by the vapor deriving portion. The expanded steam is guided to the second space. Therefore, the generator main body accommodated in the second space can be cooled by the low-temperature steam after expansion in a state where the entire generator main body is accommodated in the housing, and the temperature rise of the generator main body is suppressed. As a result, the deterioration of the power generation efficiency of the generator body can be suppressed.

  Further, in this power generation system, the liquid working medium discharged from the condenser is guided to the housing side by the cooling line, and the guided liquid working medium is supplied to the second space of the steam outlet by the jetting device. Since it is injected toward the vicinity of the outlet on the side, it is possible to further lower the temperature of the expanded steam by using the latent heat of vaporization of the liquid working medium. Therefore, the generator main body can be efficiently cooled by this lower temperature steam.

  In this invention, it is provided between the said condenser and the said evaporator, It has the pump which pumps the said liquid working medium discharged | emitted from the said condenser to the said evaporator, The said line for cooling is the said pump It is preferable to connect the downstream side to the housing.

  According to this configuration, the liquid working medium can be easily supplied to the second space by using the pump for pumping the working medium discharged from the condenser to the condenser.

  Moreover, it is preferable that the said injection apparatus atomizes the said liquid working medium and injects toward the exit vicinity of the 2nd space side of the said vapor | steam derivation | leading-out part.

  According to this configuration, the surface area of the liquid working medium supplied to the second space is increased, and the contact area between the liquid working medium and the steam led out to the second space by the steam lead-out portion is increased. . Therefore, the temperature of the steam can be further lowered by the liquid working medium, and the generator main body can be cooled more efficiently by the lowered working medium.

  The generator body is spaced apart from a rotating shaft extending in a specific direction, a rotor that rotates around the rotating shaft as the expander body rotates, and a direction substantially perpendicular to the specific direction from the rotor. And the steam outlet portion communicates the first space with a portion of the second space on one side in the specific direction from the generator main body, It is preferable that the outflow portion is opened in a portion of the second space on the other side in the specific direction with respect to the generator body.

  In this configuration, the steam outlet and the outflow part are respectively provided on both sides of the second space in a specific direction with the generator body interposed therebetween, and thus are guided to the second space by the steam outlet. The steam moves from the steam outlet part side to the outflow part side through a gap between the rotor and the stator. Therefore, the steam can be brought into contact with the entire direction of the rotor and the stator, and the rotor and the stator can be efficiently cooled.

  In this case, the stator is provided on the outer side in the radial direction of the rotor and has an outer surface extending in the specific direction, and the housing is located between the outer surface of the stator and the specific surface. It is preferable to have a communication portion that extends in a direction and communicates a portion on one side in the specific direction and a portion on the other side in the second space with respect to the generator body.

  In this configuration, the steam guided to the second space by the steam outlet part moves to the outflow part side through the communication part in addition to the gap between the rotor and the stator. Therefore, the contact area between the steam and the stator and the rotor is increased, and the generator body can be cooled more efficiently.

  As described above, according to the present invention, the generator body can be efficiently cooled while suppressing leakage of the working medium into the atmosphere or the like.

It is a figure which shows the structure of the electric power generation system by embodiment of this invention. It is a schematic sectional drawing which shows the structure of the electric power generating apparatus shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a power generation system 1 according to an embodiment of the present invention. This power generation system 1 is configured as a binary power generation type power generation system that recovers power from low-temperature waste heat by using a working medium having a low boiling point. Examples of the working medium include R245fa.

  The power generation system 1 includes an evaporator 10, a power generation device 20, a condenser 70, and a pump 80 on a circulation line 2 through which a working medium circulates. Further, the power generation system 1 includes a cooling medium supply device 90 including a cooling line 92 and a spray nozzle (injection device) 94 that can inject liquid in a mist form.

  The evaporator 10 is for generating steam of the working medium. The evaporator 10 evaporates the working medium sent from the condenser 30 through the circulation line 2 by waste heat. The evaporator 10 evaporates the working medium by indirectly contacting the working medium with a fluid having a temperature higher than the boiling point of the working medium such as hot water or heated air supplied from the outside. The steam generated by the evaporator 10 is sent to the power generator 20.

  The power generation device 20 is for generating power using the steam supplied from the evaporator 10. Although details of the power generator 20 will be described later, the power generator 20 includes a screw expander (expander main body) 30 and a generator (generator main body) 40, and the screw expander 30. Is rotated by the steam of the working medium, and the generator 40 rotates to generate power. The steam used for power generation by the power generation device 20 is sent to the condenser 70.

  The condenser 70 is for cooling the vapor of the working medium supplied from the power generation device 20 and liquefying the vapor. In the present embodiment, the condenser 70 cools the working medium by indirectly contacting the low-temperature cooling water with the working medium. The liquid working medium discharged from the condenser 70 is pumped from the condenser 70 to the evaporator 10 by a pump 80 provided between the condenser 70 and the evaporator 10. The liquid working medium pumped to the evaporator 10 is evaporated again by the evaporator 10.

  In this way, in the power generation system 1, the working medium is supplied from the evaporator 10 to the power generation device 20 through the circulation line 2, supplied from the power generation device 20 to the condenser 70, and then the condenser 70. Is connected to the evaporator 10 via the pump 80. And an electrical energy is produced | generated from waste heat because a working medium circulates through this circulation circuit.

  The cooling line 92 is a downstream side of the pump 80 in the circulation line 2, more specifically, a portion between the pump 80 and the evaporator 10, and a generator main body accommodating portion described later of the power generator 20. 54 is connected. A part of the liquid working medium condensed by the condenser 70 is fed into the cooling line 92 by the pump 80. A part of the fed liquid working medium is guided to the generator main body accommodating portion 54 side through the cooling line 92.

  The spray nozzle 94 is attached to the generator body housing 54. The spray nozzle 94 faces the generator main body accommodating portion 54 in a state of being connected to the cooling line 92. The spray nozzle 94 atomizes the liquid working medium guided to the generator main body accommodating part 54 side through the cooling line 92 and mists the working medium into the generator main body accommodating part 54. Inject into a shape.

  Next, details of the power generator 20 will be described. FIG. 2 is a schematic cross-sectional view showing the configuration of the power generation device 20.

  As described above, in addition to the screw expander 30 and the generator 40, the power generator 20 includes a housing 50 that accommodates the screw expander 30 and the generator 40 in a connected state. And an oil recovery device 60.

  The screw expander 30 includes a pair of screw rotors 32 that mesh with each other and rotate, and a screw rotor support portion 34 that rotatably supports the screw rotors 32. These screw rotors 32 rotate around a predetermined rotation axis while expanding the steam by the steam supplied from the evaporator 10 to the power generation device 20.

  The generator 40 includes a substantially cylindrical rotor (rotor) 42 that rotates around a predetermined rotation axis, and a stator (stator) 44 that is disposed on the outer side in the rotational radial direction of the rotor 42 and surrounds the rotor 42. have. The stator 44 is disposed at a position spaced apart from the outer surface constituting the cylindrical surface of the rotor 42 in the radial direction outer side, that is, in the direction orthogonal to the rotation axis direction, and between the stator 44 and the rotor 42, the rotor 42. A gap 46 extending in the direction of the rotation axis is formed.

  The screw expander 30 and the generator 40 are arranged such that one rotation center line of the screw rotor 32 and the rotation center line of the rotor 42 are the same straight line. The one screw rotor 32 and the rotor share a rotating shaft 32a. The screw expander 30 and the generator 40 are arranged at both ends of the rotating shaft 32a and connected by the rotating shaft 32a. The rotating shaft 32a is connected to the screw expander 30 and the generator 40. The connection part which connects is comprised. The generator 40 generates electrical energy by rotating the rotor 42 as the screw expander 30 rotates upon receiving supply of steam and the rotating shaft 32a rotates.

  The housing 50 includes a partition wall portion 56 that partitions a first space 51a in which the screw expander 30 is accommodated and a second space 54a in which the generator 40 is accommodated. Specifically, the casing 50 shares the partition wall portion 56 and houses the expander body housing portion 51 in which the first space 51a is formed and the generator body housing in which the second space 54a is formed. Part 54. The expander main body accommodating portion 51 has a hollow substantially cylindrical shape extending in a direction parallel to the rotation shaft 32a. The generator main body accommodating portion 54 has a hollow substantially cylindrical shape extending in a direction parallel to the rotation shaft 32a. The expander main body accommodating portion 51 and the generator main body accommodating portion 54 are arranged in a direction parallel to the rotation shaft 32a. Hereinafter, the direction of the rotating shaft 32a is referred to as the front-rear direction, the expander body housing portion 51 side is referred to as the front, and the generator body housing portion 54 side is referred to as the rear. The partition wall portion 56 includes a rear end portion of the expander body housing portion 51 and a front end portion of the generator body housing portion 54, and extends in a direction substantially orthogonal to the front-rear direction.

  The screw rotor support 34 is accommodated in the front portion of the first space 51a that is the internal space of the expander main body accommodating portion 51, and the front portion of the expander main body accommodating portion 51 is the screw rotor support portion. It functions as the accommodating part 52. The screw rotor 32 is accommodated in the rear portion of the first space 51 a, and the rear portion of the expander main body accommodating portion 51 functions as a screw rotor accommodating portion 53. The screw rotor accommodating portion 53 is larger in diameter than the screw rotor supporting portion accommodating portion 52, and the front end surface 53 b of the screw rotor accommodating portion 53 is more radial than the outer peripheral surface of the screw rotor supporting portion accommodating portion 52. It extends outward. At the outer peripheral end of the expander main body accommodating portion 51, a case connecting portion 51b that protrudes forward and is connected to an oil recovery portion case 62 described later of the oil recovery device 60 is provided.

  The screw rotor accommodating portion 53 has a suction portion 53 c that sucks the steam from the evaporator 10 and supplies the steam to the screw rotor 32. The suction portion 53c communicates the inside of a later-described second steam guide pipe 68 into which the steam flows from the evaporator 10 and the inner space 53a of the screw rotor accommodating portion 53, more specifically, the first space 51a. ing. The suction portion 53 c extends from the front end surface 53 b of the screw rotor accommodating portion 53 to the front end portion of the screw rotor 32. The steam discharged from the evaporator 10 is supplied to the front end portion of the screw rotor 32 by the suction portion 53c. The steam supplied to the front end portion of the screw rotor 32 moves backward while rotating and rotating the screw rotor 32.

  The partition wall 56 passes through the partition wall 56 in the front-rear direction and communicates with the internal space 53a of the screw rotor housing 53 and the internal space of the generator body housing 54, that is, the second space 54a. It has a shaft communication portion (connection portion accommodating portion) 56a and a steam outlet portion 56b.

  The rotary shaft 32a is inserted and accommodated in the rotary shaft communication portion 56a. The rotating shaft 32a extends across the screw rotor 32 housed in the internal space 53a of the screw rotor housing portion 53 and the generator 40 housed in the second space 54a via the rotating shaft communication portion 56a. It extends. The rotation shaft 32a is rotatably supported by a bearing in the rotation shaft communication portion 56a.

  The front end portion of the steam outlet 56 b faces the rear end portion of the screw rotor 32. The steam expanded by the screw rotor 32 flows into the steam outlet 56b. This steam flows into the second space 54a through the steam outlet 56b. As described above, the steam outlet 56b guides the steam after the expansion of the first space 51a, more specifically, the internal space 53a of the screw rotor accommodating portion 53, to the second space 54a.

  The generator main body accommodating portion 54 has a plurality of holding walls 54d, an outflow portion 54f, and a spray nozzle attaching portion 54h.

  The generator main body 40 is disposed in the inner space of the generator main body accommodating portion 54, that is, in the second space 54a, in the vicinity of the center in the front-rear direction, and in the second space 54a, the generator main body 40 is disposed. A generator front space 54b ahead of the generator and a generator rear space 54c behind the generator body 40 are formed. As described above, the partition wall portion 56 provided with the steam outlet 56b is configured by the front end portion of the generator main body accommodating portion 54, and the steam outlet 56b is formed in the second space 54a. The generator front space 54 b communicates with the internal space 53 a of the screw rotor accommodating portion 53. Therefore, the steam expanded by the screw rotor 32 is led out to the generator front space 54b by the steam lead-out portion 56b.

  The spray nozzle mounting portion 54 h communicates the inside and outside of the generator body housing portion 54. The spray nozzle 94 is mounted on the spray nozzle mounting portion 54h. The spray nozzle mounting portion 54 h is provided in front of the generator body 40 in the generator body housing portion 54. As described above, the spray nozzle 94 is connected to the spray nozzle mounting portion 54h in the generator main body housing portion 54 in a state of being connected to the cooling line 92, more specifically, to the generator front space 54b. It is attached in a posture to face. The mist-like working medium ejected from the spray nozzle 94 comes into contact with the expanded steam led out to the generator front space 54b by the steam lead-out portion 56b. By this contact, the mist-like working medium is vaporized, and the vapor after expansion is cooled by the heat of vaporization.

  Further, the spray nozzle mounting portion 54h is provided at the outlet of the steam outlet 56b on the generator body housing 54 side, that is, in the vicinity of the portion of the generator body housing 54 where the steam outlet 56b opens. ing. Further, the spray nozzle 94 is configured such that the spray port faces the outlet on the generator main body housing portion 54 side of the steam outlet 56b and injects a mist-like working medium toward the outlet. 54h. Therefore, the mist-like working medium ejected by the spray nozzle 94 comes into contact with the steam before the expanded steam led out to the generator front space 54b diffuses in the generator front space 54b. By this contact, the entire steam after the expansion is uniformly cooled.

  The holding wall 54d is for holding the generator 40. These holding walls 54d have a shape that projects radially inward from the inner peripheral surface of the generator main body accommodating portion 54 and extends in the front-rear direction along the outer peripheral surface of the stator 44 at positions spaced apart from each other in the circumferential direction. ing. These holding walls 54d are in contact with the outer peripheral surface of the stator 44, and the generator 40 is held by these holding walls 54d by this contact. On the other hand, the portion of the inner peripheral surface of the generator main body accommodating portion 54 between the holding walls 54d is radially spaced from the outer peripheral surface of the stator 44, and each holding wall 54d and the outer peripheral surface of the stator 44 are separated from each other. A communication portion 54e is formed between the generator front space 54b and the generator rear space 54c.

  The communication part 54e has a shape through which the steam can pass, and a part of the steam that is led out to the generator front space 54b by the steam lead-out part 56b and cooled by the mist-like working medium. Flows into the generator rear space 54c through the communication portion 54e while being in contact with the outer peripheral surface of the stator 44. Here, as described above, a gap 46 extending in the front-rear direction is formed between the rotor 42 and the stator 44 of the generator 40, and is led out to the generator front space 54b by the steam outlet 56b. The remainder of the steam flows through the gap 46 into the generator rear space 54 c while contacting the rotor 42 and the stator 44.

  The outflow portion 54f is for causing the condenser 70 to discharge the vapor in the internal space of the generator main body accommodating portion 54, that is, the second space 54a. The outflow portion 54f is provided at the rear end portion of the generator body housing portion 54 and opens into the generator rear space 54c. The steam led out to the generator front space 54b by the steam lead-out part 56b and cooled by the mist-like working medium flows into the generator rear space 54b through the communication part 54e, etc. It is discharged to the condenser 70 side by the portion 54f.

  In this embodiment, an oil filter 54g is attached to the outflow portion 54f, and the steam in the space behind the generator passes through the oil filter 54g to remove the contained oil. Then, it is discharged to the condenser 70 side.

  The oil recovery device 60 is for removing the oil contained in the steam discharged from the evaporator 10 and supplying the steam from which the oil has been removed to the screw rotor 32. The oil recovery apparatus 60 includes an oil recovery part case 62, a filter 64, a first steam guide pipe 66, and a second steam guide pipe 68.

  The oil recovery part case 62 has a bottomed substantially cylindrical shape extending in the front-rear direction. The outer peripheral end on the opening side of the oil recovery part case 62 is connected to the case connecting part 51b of the expander body housing part 51, and the oil recovery part case 62 extends forward from the case connecting part 51b. A part of the expander main body accommodating portion 51 is accommodated inside the oil recovery portion case 62. The casing 22 of the power generator 20 is constituted by the oil recovery unit case 62 and the housing 50.

  The filter 64 is for removing oil from the steam. The filter 64 is provided in a front portion of the oil recovery unit case 62 with respect to the expander main body storage unit 51, and is provided over substantially the entire surface orthogonal to the front-rear direction of the oil recovery unit case 62. Yes.

  The first steam guide pipe 66 is for guiding the steam discharged from the evaporator 10 to the filter 64. The first steam guide pipe 66 is fixed in a through-hole 62b formed at the approximate center of a bottom portion 62a provided at the front end of the oil recovery portion case 62, and the rear end of the filter 64 extends from the bottom portion 62a. Extends in the front-rear direction. The first steam guide pipe 66 communicates with the evaporator 10, and the steam discharged from the evaporator 10 flows to the rear of the filter 64 through the first steam guide pipe 66.

  The second steam guide pipe 68 is for guiding the steam after the oil is removed through the filter 64 to the suction portion 53c. The second steam guide pipe 68 extends in the front-rear direction from the rear end of the filter 64 to the suction portion 53c. The steam that flows into the rear of the filter 64 through the first steam guide pipe 66 moves forward through the filter 64, and then moves backward through the filter 64 again. It flows into the steam guide pipe 68. The steam that has flowed into the second steam guide pipe 68 flows through the second steam guide pipe 68 into the suction portion 53c. The oil separated in the filter 64 collects in the lower part of the oil recovery unit case 62. The oil stored in the lower part of the oil recovery part case 62 is supplied into the screw rotor accommodating part 53 by an oil supply device (not shown). In addition, this oil is supplied to the rotary shaft communication portion 56a to seal the periphery of the rotary shaft 32a.

  In the power generation device 20 configured as described above, the steam supplied from the evaporator 10 is oil-separated in the oil separation device 60, and then in more detail than the first space 51a by the suction portion 53c. The screw rotor 32 is supplied to the screw rotor 32 housed in the internal space 53 a of the screw rotor housing 53. The steam supplied to the screw rotor 32 expands in the screw rotor housing 53 while rotating the screw rotor 32. The expanded steam is led out to the internal space of the generator main body accommodating part 54, that is, the second space 54a by the steam leading part 56b. A part of the vapor after the expansion tends to flow out of the screw rotor accommodating portion 53 from the screw rotor accommodating portion 53 through the rotating shaft communicating portion 56a formed in the partition wall portion 56. The rotary shaft communication portion 56a communicates the internal space 53a of the screw rotor accommodating portion 53 and the second space 54a, and the steam flows into the second space 54a without leaking out of the housing 50.

  The steam led out to the second space 54 a by the steam lead-out part 56 b comes into contact with the mist-like working medium ejected from the spray nozzle 94 and is cooled, and then between the rotor 42 and the stator 44. After passing through the gap 46 and the communication part 54e, the liquid is discharged from the outflow part 54f to the condenser 70. Here, the steam led out to the second space 54a is cooled by being expanded by the screw rotor 32 and then being brought into contact with the mist-like working medium. It has become. For this reason, the sufficiently cooled steam passes through the gap 46 between the rotor 42 and the stator 44 and the communication portion 54e, that is, the outer peripheral portion of the generator 40, thereby generating power including the rotor 42 and the stator 44. The machine 40 is reliably cooled.

  The vapor discharged to the condenser 70 becomes a liquid working medium in the condenser 70, and is then pumped again by the pump 80 into the circulation line 2 side, that is, into the evaporator 10. It is pumped to the cooling line 92 side, that is, the power generator 20 side.

  As described above, in the power generation system 1, the working medium supplied to the screw rotor 32 leaks out of the housing 50 such as in the atmosphere from the periphery of the rotary shaft 32 a that is a connection portion between the screw rotor 32 and the generator 40. While being suppressed, it is possible to suppress the temperature rise of the generator 40 using the steam expanded and lowered in temperature by the screw rotor 32. In particular, the liquid working medium discharged from the condenser 70 is sprayed in the form of a mist toward the outlet of the steam guide portion 56b on the generator body housing portion 54 side, and is expanded and cooled at the screw rotor 32. However, since the working medium is uniformly cooled by the vaporization of the working medium and further lowered in temperature, the temperature increase of the generator 40 can be more reliably suppressed.

  Here, the communication part 54e can be omitted. However, a communication portion 54e is provided between the outer peripheral surface of the stator 44 and the inner peripheral surface of the generator body housing portion 54 so as to extend in the front-rear direction and communicate the generator front space 54b and the generator rear space 54c. Then, the expanded steam led out to the generator front space 54b can be passed along the outer peripheral surface of the stator 44 to increase the contact area between the stator 44 and the steam. Can cool well.

  Further, instead of the spray nozzle 94, an injection device that injects the liquid working medium into the second space 54b without making it into a mist may be used. However, if the spray nozzle 94 is provided and the liquid working medium is sprayed in the form of a mist, the surface area of the liquid working medium is increased, and the liquid working medium and the expanded liquid supplied from the vapor outlet 56b are expanded. The contact area with the steam is increased, and the expanded steam can be efficiently cooled.

  In the present invention, the expander body is not limited to a screw expander.

DESCRIPTION OF SYMBOLS 1,101 Electric power generation system 10 Evaporator 20 Electric power generation apparatus 30 Screw type expander (compressor main body)
40 Generator (generator body)
42 Stator
44 Rotor
DESCRIPTION OF SYMBOLS 50 Housing | casing 51 Expander main body accommodating part 51a 1st space 54 Generator main body accommodating part 54a 2nd space 54e Communication part 56 Partition part 56a Rotating shaft communication part (connection part accommodating part)
56b Steam outlet 53c Suction part 54f Outflow part 70 Condenser 80 Pump 92 Cooling line 94 Spray nozzle (injection device)

Claims (5)

An evaporator that generates vapor by evaporating a liquid working medium by a predetermined heat source;
A power generation device that generates power using steam generated by the evaporator;
A condenser that condenses the steam used for power generation in the power generation device to generate a liquid working medium supplied to the evaporator;
A cooling medium supply device that supplies the liquid working medium discharged from the condenser to the power generation device,
The power generator includes an expander body that is rotationally driven by the steam while expanding the steam, a generator body that is connected to the expander body and rotates as the tensioner body rotates, and the expanders. A housing that houses the main body and the generator main body in a state where they are connected to each other;
The housing has a partition wall that partitions a first space in which the expander body is accommodated and a second space in which the generator body is accommodated,
The partition portion communicates the first space with the second space, a steam outlet for guiding the steam expanded in the first space to the second space, the expander body, and the generator body And a connecting portion receiving portion in which the connecting portion is received,
The housing sucks the steam from the evaporator and supplies the steam to the expander body, and causes the steam that has cooled the generator body in the second space to flow out to the condenser side. An outflow part is formed,
The cooling medium supply device connects a downstream side of the condenser and the casing, leads a liquid working medium discharged from the condenser to the casing side, and the cooling line An injection device capable of injecting the guided liquid working medium into the second space;
The power generation system, wherein the injection device injects a liquid working medium guided by the cooling line toward a vicinity of an outlet on the second space side of the vapor outlet portion. The power generation system according to claim 1,
A pump provided between the condenser and the evaporator to pump the liquid working medium discharged from the condenser to the evaporator;
The power generation system, wherein the cooling line connects a downstream side of the pump and the housing. The power generation system according to claim 1 or 2,
The said injection apparatus atomizes the said liquid working medium, and inject | emits it toward the exit vicinity of the 2nd space side of the said vapor | steam derivation | leading-out part. In the electric power generation system in any one of Claims 1-3,
The generator body includes a rotating shaft extending in a specific direction, a rotor that rotates around the rotating shaft as the expander body rotates, and a position spaced from the rotor in a direction substantially orthogonal to the specific direction. And a stator disposed on the
The steam outlet portion communicates the first space with a portion of the second space on the one side in the specific direction from the generator body,
The outflow part is open to a portion of the second space on the other side in the specific direction with respect to the generator body. The power generation system according to claim 4,
The stator is provided on the outer side in the radial direction of the rotor and has an outer surface extending in the specific direction.
The casing extends in the specific direction between the outer surface of the stator and communicates a portion on one side and the other side in the specific direction with respect to the generator body in the second space. A power generation system having a communication part.

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