CN108397244B - Heat energy recovery device - Google Patents

Heat energy recovery device Download PDF

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Publication number
CN108397244B
CN108397244B CN201810117676.7A CN201810117676A CN108397244B CN 108397244 B CN108397244 B CN 108397244B CN 201810117676 A CN201810117676 A CN 201810117676A CN 108397244 B CN108397244 B CN 108397244B
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China
Prior art keywords
flow path
expander
working medium
power recovery
pump
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CN201810117676.7A
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Chinese (zh)
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CN108397244A (en
Inventor
足立成人
成川裕
西村和真
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Kobe Steel Ltd
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Kobe Steel Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
    • F01C1/14—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F01C1/16—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/001—Injection of a fluid in the working chamber for sealing, cooling and lubricating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/02—Arrangements of bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/04—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/06—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/08—Cooling; Heating; Heat-insulation
    • F01D25/12—Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F01K9/02—Arrangements or modifications of condensate or air pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C20/00—Control of, monitoring of, or safety arrangements for, machines or engines
    • F01C20/06—Control of, monitoring of, or safety arrangements for, machines or engines specially adapted for stopping, starting, idling or no-load operation

Abstract

The invention provides a heat energy recovery device capable of restraining the occurrence of insufficient lubrication of a bearing during driving of an expander. The disclosed device is provided with: an evaporator (10); an expander (20); a power recovery machine (30); a condenser (40); a pump (50); a circulation flow path (60); a cooling flow path (70) which supplies a part of the liquid-phase working medium flowing out of the pump (50) to the power recovery machine (30); an on-off valve (V1) provided in the cooling channel (70); and a control unit (80); the expander (20) comprises a rotor (21), a bearing (22), and a main case (23); the power recovery machine (30) is provided with a power recovery part (31) and a sub-tank (35); the control unit (80) closes the opening/closing valve (V1) when receiving a stop signal for stopping the recovery of power in the power recovery machine (30).

Description

Heat energy recovery device
Technical Field
The present invention relates to a heat energy recovery device.
Background
Conventionally, a thermal energy recovery apparatus for recovering power from exhaust heat of various facilities such as a factory is known. For example, patent document 1 discloses a power generation system (thermal energy recovery device) including: an evaporator; a closed generator; a condenser; a fluid supply pump; a circulation flow path connecting the evaporator, the closed generator, the condenser and the fluid supply pump in this order; and a cooling pipe. The evaporator evaporates the working medium. The closed generator extracts electric power from the expansion energy of the working medium flowing out of the evaporator. Specifically, the sealed generator includes a screw turbine that expands the working medium, a generator that is connected to the screw turbine via an output shaft, and a container that accommodates the screw turbine, the output shaft, and the generator. The condenser condenses the working medium flowing out of the sealed generator. The fluid supply pump sends the working medium flowing out of the condenser to the evaporator. The cooling pipe connects a portion of the circulation flow path on the downstream side of the fluid supply pump to the storage container to supply a part of the working medium in the liquid phase discharged from the fluid supply pump into the storage container.
In this thermal energy recovery device, a part of the liquid-phase working medium discharged from the fluid supply pump during operation of the device is supplied into the storage container via the cooling pipe, so that the generator is efficiently cooled during operation of the device.
Patent document 1: japanese patent laid-open No. 2012 and 97725.
In the thermal energy recovery device described in patent document 1, there is a fear that the lubrication of the bearing of the screw turbine is insufficient at the time of restarting the device after stopping. Specifically, if the operation of the thermal energy recovery device enters a stop operation, the rotation speed of the pump starts to decrease. In this state, if the liquid-phase working medium is continuously supplied into the expander through the cooling pipe, the liquid-phase working medium, which is, for example, the liquid-phase working medium existing in the evaporator and flows into the expander after being evaporated by heat received from the heating medium, may be cooled and condensed by the liquid-phase working medium supplied through the cooling pipe, and the liquid-phase working medium may be accumulated in the expander. Further, when the bearing of the screw turbine is immersed in the working medium in the liquid phase due to the accumulation of the working medium in the liquid phase, there is a fear that insufficient lubrication of the bearing occurs at the time of restart of the device (at the time of driving the screw turbine).
Disclosure of Invention
The invention aims to provide a heat energy recovery device which can prevent the occurrence of insufficient lubrication of a bearing during the driving of an expander.
In order to achieve the above object, the present invention provides a thermal energy recovery device including: an evaporator that evaporates the working medium by exchanging heat between a heating medium and the working medium; an expander that expands the working medium flowing out of the evaporator; a power recovery machine connected to the expander; a condenser for condensing the working medium flowing out of the expander; a pump for feeding the working medium flowing out of the condenser to the evaporator; a circulation flow path connecting the evaporator, the expander, the condenser, and the pump in this order; a cooling flow path that supplies a part of the liquid-phase working medium flowing out of the pump to the power recovery unit; an on-off valve provided in the cooling passage; and a control section; the expander comprises: a rotor rotationally driven by expansion energy of the working medium; a bearing for rotatably receiving the rotor; and a main case for accommodating the rotor and the bearing; the power recovery machine includes: a power recovery unit connected to the rotor and configured to recover power by rotating together with the rotor; and a sub-tank which accommodates the power recovery unit and has a shape communicating with the inside of the main tank; the control unit closes the on-off valve if receiving a stop signal for stopping the recovery of the power in the power recovery machine.
In this thermal energy recovery device, the control unit closes the on-off valve provided in the cooling flow path if it receives a stop signal for stopping recovery of the power in the power recovery unit (if the necessity of cooling by the power recovery unit is low), and therefore accumulation of the liquid-phase working medium in the sub tank and the main tank is suppressed. This suppresses the bearing of the expander from being immersed in the working medium in the liquid phase, thereby suppressing the occurrence of insufficient lubrication of the bearing at the time of restarting the thermal energy recovery device.
In this case, the sub-tank may include an introduction portion that is connectable to the cooling flow path and that is capable of introducing the liquid-phase working medium supplied from the cooling flow path into the sub-tank.
In this aspect, the power recovery unit is efficiently cooled by the liquid-phase working medium supplied from the cooling flow path into the sub-tank.
Alternatively, the power recovery machine may further include a jacket provided in the sub-tank, and a cooling space allowing a liquid-phase working medium to flow may be formed between the jacket and the sub-tank; the jacket has an introduction portion that is connectable to the cooling flow path and that is capable of introducing the liquid-phase working medium supplied from the cooling flow path into the cooling space.
In this aspect, the power recovery unit is efficiently cooled by the working medium in the liquid phase supplied from the cooling passage to the cooling space via the sub-tank.
Further, the present invention provides a heat energy recovery device including: an evaporator that evaporates the working medium by exchanging heat between a heating medium and the working medium; an expander that expands the working medium flowing out of the evaporator; a power recovery machine connected to the expander; a condenser for condensing the working medium flowing out of the expander; a pump for feeding the working medium flowing out of the condenser to the evaporator; a circulation flow path connecting the evaporator, the expander, the condenser, and the pump in this order; a cooling flow path for cooling the power recovery machine by supplying a cooling medium different from the working medium to the power recovery machine; an on-off valve provided in the cooling passage; and a control section; the expander comprises: a rotor rotationally driven by expansion energy of the working medium; a bearing for rotatably receiving the rotor; and a main case for accommodating the rotor and the bearing; the power recovery machine includes: a power recovery unit connected to the rotor and configured to recover power by rotating together with the rotor; and a sub-tank which accommodates the power recovery unit and has a shape communicating with the inside of the main tank; the control unit closes the on-off valve if receiving a stop signal for stopping the recovery of the power in the power recovery machine.
In this thermal energy recovery device, too, the occurrence of insufficient lubrication of the bearings of the expander at the time of driving of the device (at the time of start of operation) is suppressed.
In the above-described thermal energy recovery device, it is preferable that the device further includes a liquid leakage flow path that returns the liquid-phase working medium in the main tank or the sub-tank to a downstream side of the expander and an upstream side of the pump.
In this case, the liquid-phase working medium in the main tank or the sub-tank is efficiently discharged from the main tank or the sub-tank through the liquid leakage flow path, and hence the immersion of the bearing in the liquid-phase working medium is more reliably suppressed.
In this case, it is preferable that the apparatus further comprises: a liquid leakage valve provided in the liquid leakage flow path; a bypass flow path that bypasses the expander; a bypass valve provided in the bypass flow path; and a shutoff valve provided in a portion of the circulation flow path between a connection portion between the circulation flow path and an upstream end of the bypass flow path and the expander; the control unit, upon receiving a stop signal for stopping the recovery of the power in the power recovery machine, performs operations of reducing the rotation speed of the pump, closing the shutoff valve and opening the bypass valve, and closing the on-off valve, and opens the liquid leakage valve after the pump is stopped.
In this case, the liquid-phase working medium in the main tank or the sub-tank is efficiently discharged from the tank, and the inflow of the working medium into the main tank until the pump is stopped is suppressed. Specifically, when the liquid leakage valve is opened before the pump is stopped, the working medium discharged from the pump and having reached the downstream side of the expander through the bypass flow path flows back in the circulation flow path from the downstream side of the expander, and thereby flows into the main tank of the expander and may be liquefied in the main tank. In contrast, in the present thermal energy recovery device, the control unit opens the liquid leakage valve after the pump is stopped, and therefore occurrence of the above-described problem is suppressed.
As described above, according to the present invention, it is possible to provide a thermal energy recovery device capable of suppressing the occurrence of insufficient lubrication of a bearing when driving an expander.
Drawings
Fig. 1 is a view schematically showing the structure of a thermal energy recovery apparatus according to embodiment 1 of the present invention.
Fig. 2 is a flowchart showing the control content of the control unit.
Fig. 3 is a view schematically showing the structure of the thermal energy recovery apparatus according to embodiment 2 of the present invention.
Fig. 4 is a view schematically showing the structure of the thermal energy recovery apparatus according to embodiment 3 of the present invention.
Detailed Description
The present embodiment will be described in detail below with reference to the drawings.
(embodiment 1)
Fig. 1 shows a structure of a thermal energy recovery apparatus according to embodiment 1 of the present invention. The heat recovery device is provided with: an evaporator 10; an expander 20; a power recovery machine 30; a condenser 40; a pump 50; a circulation flow path 60 connecting the evaporator 10, the expander 20, the condenser 40, and the pump 50 in this order; a cooling flow path 70; and a control section 80.
The evaporator 10 evaporates the working medium by causing the working medium to exchange heat with the heating medium.
The expander 20 is provided in a portion of the circulation flow path 60 on the downstream side of the evaporator 10. The expander 20 expands the working medium in a gas phase flowing out of the evaporator 10. In the present embodiment, a positive displacement screw expander having a rotor rotationally driven by expansion energy of a gas-phase working medium is used as the expander 20. Specifically, the expander 20 includes: a pair of male and female screw rotors (rotors) 21 rotationally driven by expansion energy of the working medium; a bearing 22 that rotatably receives the screw rotor 21; and a main casing 23 that accommodates the pair of screw rotors 21 and the bearing 22 together. The main tank 23 has an intake port 23a for taking in the working medium flowing out from the evaporator 10, and an exhaust port 23b for discharging the expanded working medium (after the pair of screw rotors 21 are rotationally driven) to the circulation flow path 60. In the present embodiment, the main tank 23 is disposed in a posture in which the discharge port 23b is oriented horizontally. The bearing 22 is held by the main case 23.
The power recovery machine 30 is connected to the expander 20. Specifically, the power recovery machine 30 includes a power recovery unit 31 and a sub-tank 35.
The power recovery machine 30 is connected to one of the pair of screw rotors 21, and recovers power by rotating together with the screw rotor 21. In the present embodiment, a generator is used as the power recovery machine 30. That is, the power recovery unit 31 includes a rotating shaft 32 connected to one of the pair of screw rotors 21, a rotor 33 fixed to the rotating shaft 32, and a stator 34 disposed around the rotor 33. Further, as the power recovery machine 30, a compressor or the like may be used.
The sub-tank 35 accommodates the power recovery portion 31. The sub-tank 35 is fixed to the main tank 23. The sub tank 35 communicates with the main tank 23. Therefore, a part of the working medium expanded in the main tank 23 reaches the sub tank 35.
The condenser 40 is provided in a portion of the circulation flow path 60 on the downstream side of the expander 20. The condenser 40 condenses the working medium (cooling water or the like) by exchanging heat between the working medium flowing out of the expander 20 and the cooling medium.
In the present embodiment, a storage unit (receiving unit) 45 for storing the liquid-phase working medium is provided in a portion of the circulation flow path 60 on the downstream side of the condenser 40. However, the reservoir 45 may be formed by a part of the circulation channel 60, or may be omitted.
The pump 50 is provided in a portion of the circulation flow path 60 on the downstream side of the condenser 40 (a portion between the condenser 40 and the evaporator 10). The pump 50 sends the liquid-phase working medium flowing out of the condenser 40 to the evaporator 10 at a predetermined pressure.
The cooling passage 70 supplies a part of the liquid-phase working medium flowing out of the pump 50 to the power recovery machine 30. In the present embodiment, the cooling passage 70 connects the portion of the circulation passage 60 between the pump 50 and the evaporator 10 to the sub-tank 35. Specifically, the sub-tank 35 has an introduction portion 35a capable of introducing the liquid-phase working medium into the sub-tank 35, and the downstream end of the cooling passage 70 is connected to the introduction portion 35 a. Therefore, a part of the liquid-phase working medium discharged from the pump 50 is supplied into the sub-tank 35 via the cooling passage 70. This effectively cools the power recovery unit 31.
The heat energy recovery device of the present embodiment further includes a liquid leakage flow path (liquid removal flow path) 71. The liquid leakage flow path 71 returns the working medium R in the liquid phase in the main tank 23 or the sub-tank 35 to the downstream side of the expander 20 and the upstream side of the pump 50, that is, to a region where the working medium is present in the liquid phase. Specifically, the liquid leakage flow path 71 connects the lead-out portion 23c formed in the main tank 23 and a portion of the circulation flow path 60 between the reservoir portion 45 and the pump 50. The lead-out portion 23c is provided at the lowermost bottom portion 25 of the main tank 23. The downstream end of the liquid leakage flow path 71 may be connected to a portion of the circulation flow path 60 between the expander 20 and the condenser 40, the inside of the condenser 40, or the reservoir 45.
The thermal energy recovery device of the present embodiment further includes: a bypass flow path 62 for bypassing the expander 20; an on-off valve V1 provided in the cooling flow path 70; a shutoff valve V2 provided in the circulation flow path 60; a bypass valve V3 provided in the bypass flow path 62; and a liquid leakage valve V4 provided in the liquid leakage flow path 71. The valves VI to V4 are configured to be openable and closable.
An upstream end of the bypass passage 62 is connected to a portion of the circulation passage 60 between the evaporator 10 and the expander 20. The downstream end of the bypass flow path 62 is connected to a portion of the circulation flow path 60 between the expander 20 and the condenser 40.
The shutoff valve V2 is provided in the circulation flow path 60 at a position between the expander 20 and a connection portion between the circulation flow path 60 and the upstream end of the bypass flow path 62.
The control unit 80 stops the cooling of the power recovery unit 31, that is, stops the supply of a part of the liquid-phase working medium discharged from the pump 50 to the power recovery machine 30 via the cooling flow path 70, if a stop signal for stopping the recovery of the power in the power recovery machine 30 is received during the recovery of the power (electric power in the present embodiment) in the power recovery machine 30 (during the driving of the expander 20, the power recovery machine 30, and the pump 50). The control content of the control unit 80 will be described below with reference to fig. 2. During the driving of the present apparatus, the on-off valve V1 and the shutoff valve V2 are opened, and the bypass valve V3 and the liquid leakage valve V4 are closed.
Upon receiving the stop signal, the control unit 80 reduces the rotation speeds of the pump 50, the expander 20, and the power recovery machine 30, closes the shutoff valve V2, and opens the bypass valve V3 (step S11). Thereby, the gas-phase working medium flowing out of the evaporator 10 is passed through the bypass flow path 62 (bypassing the expander 20) to the condenser 40.
Since the necessity of cooling the power recovery unit 31 becomes low due to the decrease in the rotation speed of the expander 20 and the power recovery unit 30, the controller 80 closes the opening/closing valve V1 (step S12). As a result, the supply of the liquid-phase working medium into the sub-tank 35 via the cooling flow path 70 is stopped. This suppresses excessive cooling of the power recovery unit 31, that is, accumulation of the liquid-phase working medium R in the sub tank 35 and the main tank 23.
After the pump 50 is stopped, the controller 80 opens the liquid leakage valve V4 (step S13). Thereby, the working medium R in the liquid phase in the main tank 23 or the sub-tank 35 is efficiently discharged from the tanks 23 and 35.
As described above, in the present thermal energy recovery device, if the control unit 80 receives the stop signal (if the necessity of cooling the power recovery unit 31 becomes low), the supply of a part of the liquid-phase working medium discharged from the pump 50 to the power recovery machine 30 via the cooling flow path 70 is stopped. Specifically, the control unit 80 closes the on-off valve V1 provided in the cooling flow path 70 upon receiving the stop signal. Therefore, accumulation of the working medium in the liquid phase in the sub tank 35 and the main tank 23 is suppressed. This suppresses the bearing 22 of the expander 20 from being immersed in the working medium R in the liquid phase, thereby suppressing the occurrence of insufficient lubrication of the bearing 22 at the time of restart of the thermal energy recovery device.
In step S13, since the liquid leakage valve V4 is opened after the pump 50 is stopped, the liquid-phase working medium R in the main tank 23 or the sub-tank 35 is efficiently discharged from the tanks 23 and 35, and the flow of the working medium into the main tank 23 until the pump 50 is stopped is suppressed. Specifically, in the case where the liquid leakage valve V4 is opened before the pump 50 is stopped, there is a possibility that: the working medium discharged from the pump 50 and reaching the downstream side of the expander 20 through the bypass flow path 62 flows back through the circulation flow path 60 from the downstream side of the expander 20 into the main tank 23 of the expander 20, and is liquefied in the main tank 23. In contrast, in the present embodiment, the controller 80 opens the liquid leakage valve V4 after the pump 50 is stopped, and therefore the occurrence of the above-described problem is suppressed.
(embodiment 2)
Next, a thermal energy recovery device according to embodiment 2 of the present invention will be described with reference to fig. 3. In embodiment 2, only the portions different from embodiment 1 will be described, and descriptions of the same structures, operations, and effects as those of embodiment 1 will be omitted.
In the present embodiment, the power recovery machine 30 has the jacket 36, and the downstream end of the cooling flow path 70 is connected to the jacket 36.
The jacket 36 is provided in the sub-tank 35 such that a cooling space S allowing a working medium in a liquid phase to flow is formed between the jacket 36 and the sub-tank 35. The jacket 36 is disposed outside the outer peripheral surface of the sub-tank 35. That is, the cooling space S is formed between the outer peripheral surface of the sub-tank 35 and the inner peripheral surface of the jacket 36. The jacket 36 has an introduction portion 36a that is connectable to the downstream end of the cooling flow path 70 and that is capable of introducing the liquid-phase working medium supplied from the cooling flow path 70 into the cooling space S.
The cooling medium having passed through the cooling space S and cooled by the power recovery unit 31 via the sub-tank 35 flows into the circulation flow path 60 via the discharge flow path 72. The upstream end of the discharge flow path 72 is connected to the discharge unit 36b, the discharge unit 36b is formed in the jacket 36, and the downstream end of the discharge flow path 72 is connected to a portion between the expander 20 and the condenser 40 in the circulation flow path 60.
As described above, in the present embodiment, the bearing 22 of the expander 20 is also prevented from being immersed in the working medium R in the liquid phase, and thus the occurrence of insufficient lubrication of the bearing 22 at the time of restart of the thermal energy recovery device is prevented.
(embodiment 3)
Next, a thermal energy recovery device according to embodiment 3 of the present invention will be described with reference to fig. 4. In embodiment 3, only the portions different from embodiment 1 will be described, and descriptions of the same structures, operations, and effects as those of embodiment 1 will be omitted.
In the present embodiment, the power recovery machine 30 has the jacket 36 in common with embodiment 2, but a cooling medium (cooling water or the like) different from the working medium is supplied to the cooling space S.
The jacket 36 is connected to a cooling flow path 73 branched from a cooling medium supply line L1 through which a cooling medium is supplied. Therefore, in the present embodiment, the power recovery unit 31 is cooled by the cooling medium passing through the cooling space S via the sub-tank 35. The coolant having passed through the cooling space S is returned to the coolant discharge line L2 through the coolant recovery flow path 74 connected to the jacket 36.
As described above, the present embodiment can also obtain the same effects as those of the above embodiments.
In addition, the embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present invention is defined by the claims rather than the description of the above embodiments, and all modifications equivalent in meaning and scope to the claims are included.
For example, the sub-tank 35 and the jacket 36 forming the cooling space S may be separate members or may be integrally molded by casting.
Description of the reference numerals
10 evaporator
20 expander
21 rotor (screw rotor)
22 bearing
23 Main box
30 power recovery machine
31 power recovery unit
35 auxiliary box
36 envelope
40 condenser
50 pump
60 circulation flow path
62 bypass flow path
70 cooling flow path
71 liquid leakage flow path
73 cooling flow path
80 control part
S cooling space
V1 opening and closing valve
V2 stop valve
V3 bypass valve
And a V4 liquid leakage valve.

Claims (8)

1. A heat energy recovery device is characterized in that,
the disclosed device is provided with:
an evaporator that evaporates the working medium by exchanging heat between a heating medium and the working medium;
an expander that expands the working medium flowing out of the evaporator;
a power recovery machine connected to the expander;
a condenser for condensing the working medium flowing out of the expander;
a pump for feeding the working medium flowing out of the condenser to the evaporator;
a circulation flow path which connects the evaporator, the expander, the condenser, and the pump in this order;
a cooling flow path that supplies a part of the liquid-phase working medium flowing out of the pump to the power recovery unit;
an on-off valve provided in the cooling passage; and
a control unit;
the expander comprises:
a rotor rotationally driven by expansion energy of the working medium;
a bearing for rotatably receiving the rotor; and
a main case for accommodating the rotor and the bearing;
the power recovery machine includes:
a power recovery unit connected to the rotor and configured to recover power by rotating together with the rotor; and
a sub-tank which accommodates the power recovery unit and has a shape communicating with the inside of the main tank;
the control unit, upon receiving a stop signal for stopping the recovery of the power in the power recovery machine, reduces the rotation speeds of the expander and the power recovery machine, and closes the on-off valve.
2. The thermal energy recovery device of claim 1,
the sub-tank has an introduction portion that is connectable to the cooling flow path and that is capable of introducing the liquid-phase working medium supplied from the cooling flow path into the sub-tank.
3. The thermal energy recovery device of claim 1,
the power recovery machine further includes a jacket provided in the sub-tank, and a cooling space allowing a working medium in a liquid phase to flow is formed between the jacket and the sub-tank;
the jacket has an introduction portion that is connectable to the cooling flow path and that is capable of introducing the liquid-phase working medium supplied from the cooling flow path into the cooling space.
4. The heat recovery device according to any one of claims 1 to 3,
the expander further includes a liquid leakage flow path that returns the liquid-phase working medium in the main tank or the sub-tank to a downstream side of the expander and an upstream side of the pump.
5. The thermal energy recovery device of claim 4,
further provided with:
a liquid leakage valve provided in the liquid leakage flow path;
a bypass flow path that bypasses the expander;
a bypass valve provided in the bypass flow path; and
a shutoff valve provided in a portion of the circulation flow path between a connection portion between the circulation flow path and an upstream end of the bypass flow path and the expander;
the control unit, upon receiving a stop signal for stopping the recovery of the power in the power recovery machine, performs operations of reducing the rotation speed of the pump, closing the shutoff valve, opening the bypass valve, and closing the on-off valve, and opens the liquid leakage valve after the pump is stopped.
6. A heat energy recovery device is characterized in that,
the disclosed device is provided with:
an evaporator that evaporates the working medium by exchanging heat between a heating medium and the working medium;
an expander that expands the working medium flowing out of the evaporator;
a power recovery machine connected to the expander;
a condenser for condensing the working medium flowing out of the expander;
a pump for feeding the working medium flowing out of the condenser to the evaporator;
a circulation flow path which connects the evaporator, the expander, the condenser, and the pump in this order;
a cooling flow path for cooling the power recovery machine by supplying a cooling medium different from the working medium to the power recovery machine;
an on-off valve provided in the cooling passage; and
a control unit;
the expander comprises:
a rotor rotationally driven by expansion energy of the working medium;
a bearing for rotatably receiving the rotor; and
a main case for accommodating the rotor and the bearing;
the power recovery machine includes:
a power recovery unit connected to the rotor and configured to recover power by rotating together with the rotor; and
a sub-tank which accommodates the power recovery unit and has a shape communicating with the inside of the main tank;
the control unit, upon receiving a stop signal for stopping the recovery of the power in the power recovery machine, reduces the rotation speeds of the expander and the power recovery machine, and closes the on-off valve.
7. The thermal energy recovery device of claim 6,
the expander further includes a liquid leakage flow path that returns the liquid-phase working medium in the main tank or the sub-tank to a downstream side of the expander and an upstream side of the pump.
8. The thermal energy recovery device of claim 7,
further provided with:
a liquid leakage valve provided in the liquid leakage flow path;
a bypass flow path that bypasses the expander;
a bypass valve provided in the bypass flow path; and
a shutoff valve provided in a portion of the circulation flow path between a connection portion between the circulation flow path and an upstream end of the bypass flow path and the expander;
the control unit, upon receiving a stop signal for stopping the recovery of the power in the power recovery machine, performs operations of reducing the rotation speed of the pump, closing the shutoff valve, opening the bypass valve, and closing the on-off valve, and opens the liquid leakage valve after the pump is stopped.
CN201810117676.7A 2017-02-06 2018-02-06 Heat energy recovery device Active CN108397244B (en)

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EP3358155A1 (en) 2018-08-08
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US10385734B2 (en) 2019-08-20
CN108397244A (en) 2018-08-14

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