JP2016037859A - Waste heat power-generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste heat power-generating device capable of shortening time required for recovering and refilling a working medium.SOLUTION: A waste heat power-generating device comprises work medium circulating piping which has: an evaporator which evaporates a working medium through heat exchange between hot water and the working medium; an expansion turbine power-generating unit which generates electric power with the work medium supplied from the evaporator; a condenser which condenses the work medium through the heat exchange between the work medium discharged from the expansion turbine power-generating unit and cooling water; and a pump which pumps the work medium condensed by the condenser toward the evaporator. The waste heat power-generating device also includes: a shut-off valve which is installed at an upstream side of the expansion turbine power-generating unit and closes the circulation piping; and a manual valve which is installed at a downstream side of the expansion turbine power-generating unit and closes the circulation piping.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waste heat power generation apparatus.

  Conventionally, power generation is performed by recovering waste heat energy released in factories, incineration facilities, and the like, and energy is saved by reusing electric energy obtained by this power generation. In such factories and facilities, waste heat of about 300 ° C. or higher (nearly 1000 ° C. in some cases) is used for power generation because it easily generates high-pressure steam for driving the generator. Most of the low-temperature waste heat below ℃ was still released into the atmosphere. For this reason, it is considered that further energy saving can be realized by recovering waste heat energy of low-temperature waste heat that has hardly been collected in the past and generating power.

  Patent Document 1 below discloses a waste heat power generation apparatus that generates power using waste heat energy of low temperature waste heat of 300 ° C. or lower by a Rankine cycle using a low boiling point working medium. Specifically, the waste heat power generation apparatus disclosed in Patent Document 1 below includes a waste heat recovery device, a steam turbine, a condenser, and a high-pressure pump, and the low-temperature waste heat recovered by the waste heat recovery device. Is used to generate high-pressure steam as a low-boiling working medium, and the steam turbine is driven by this high-pressure steam to generate electricity. The exhaust gas from the steam turbine is condensed and liquefied by a condenser, and the liquefied low boiling point working medium is sent to a waste heat recovery device for circulation.

JP 2000-110514 A

  By the way, in the waste heat power generation apparatus mentioned above, since the performance of the steam turbine is directly linked to the power generation efficiency, maintenance of the steam turbine is performed regularly or irregularly in order to maintain the power generation efficiency. Conventionally, in order to perform maintenance of the steam turbine, it is necessary to perform an operation of removing the steam turbine after extracting all the low boiling point working medium used in the waste heat power generation apparatus, and after completing the maintenance of the steam turbine, It is necessary to re-install the steam turbine and refill the low-boiling working medium. Thus, conventionally, there has been a problem that it takes a long time to extract and refill the low boiling point working medium.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a waste heat power generator capable of shortening the time required for recovery and refilling of a working medium.

In order to solve the above-described problem, the waste heat power generation apparatus of the present invention includes an evaporator (11) that performs heat exchange between the waste heat medium (X) and the working medium (Y) to evaporate the working medium, The turbine generator (12) that generates power by supplying the working medium from the evaporator, and the working medium discharged from the turbine generator and the cooling medium (Z) exchange heat to condense the working medium. Waste heat provided with a circulation channel (Q3) for the working medium provided with a condenser (13) for carrying out the operation and a pump (15) for sending the working medium condensed in the condenser toward the evaporator In the power generation device (10), a first valve (V1) provided on the upstream side of the turbine generator and closing the circulation flow path, and provided on the downstream side of the turbine generator and the circulation flow path And a second valve (V2) for closing It is.
Further, in the waste heat power generation apparatus of the present invention, the turbine generator collects the circulation channel partitioned by the first valve and the second valve and the working medium remaining in the turbine generator, The circulation passage partitioned by the first valve and the second valve and a port portion (PT) for supplying the working medium into the turbine generator are provided.
Moreover, the waste heat power generator according to the present invention is configured such that the turbine generator has the circulation flow path at each of a first position downstream of the first valve and a second position upstream of the second valve. It is characterized in that it is detachably attached to.
In the waste heat power generator of the present invention, the first valve is a shut-off valve that automatically shuts off the circulation channel when the waste heat power generator is in an operation stop state. Yes.
Further, the waste heat power generation apparatus of the present invention is provided between the condenser and the pump, and temporarily stores the working medium condensed by the condenser and the liquefied working medium. It is characterized by comprising a recovery pipe (Q7) for connecting the liquid pool where the water remains and the tank.
Moreover, the waste heat power generator of the present invention is characterized in that the liquid pool portion is a bottom portion (P1) of the turbine generator or a portion (P2) into which the working medium flows into the evaporator.

  According to the present invention, the circulation passage is closed by the first valve provided upstream of the turbine generator and the second valve provided downstream of the turbine generator, and the working medium for the turbine generator is provided. Since the recovery and refilling are partially performed, it is possible to shorten the time required for the recovery and refilling of the working medium.

It is a block diagram which simplifies and shows the whole structure of the waste heat power generator by one Embodiment of this invention. 1 is a perspective view of a waste heat power generator according to an embodiment of the present invention. It is a perspective view which shows the piping for collection | recovery with which the waste heat power generator by one Embodiment of this invention is provided. It is a figure for demonstrating the maintenance procedure in one Embodiment of this invention. It is a figure for demonstrating the collection | recovery method of the working medium from the liquid pool part in circulation piping.

  Hereinafter, a waste heat power generator according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a simplified overall configuration of a waste heat power generator according to an embodiment of the present invention. As shown in FIG. 1, the waste heat power generation apparatus 10 generates power using a Rankine cycle including an evaporator 11, an expansion turbine generator 12 (turbine generator), a condenser 13, a reservoir tank 14 (tank), and a pump 15. Device.

  Such a waste heat power generation apparatus 10 generates power by collecting waste heat energy of a waste heat medium (referred to as “warm water X” in this embodiment) of about 300 ° C. or less released from a factory, an incineration facility, or the like. The waste heat medium is not limited to the hot water X, and a gas released from a factory or an incineration facility can also be used. As shown in FIG. 1, the waste heat power generation apparatus 10 includes a shutoff valve V1 (first valve), a manual valve V2 (second valve), and a bypass valve V3, which will be described later.

  The evaporator 11 is supplied with hot water X discharged from a factory or the like and the working medium Y sent from the pump 15 through different paths, and generates heat of the working medium Y by exchanging heat inside. That is, the evaporator 11 recovers the waste heat energy of the hot water X and generates the vapor of the working medium Y. In FIG. 1, two evaporators 11 connected in parallel are illustrated, but the number of evaporators 11 may be one or three or more.

  Here, the working medium Y is a medium having a boiling point (boiling point under atmospheric pressure) of about 15 ° C., and the pressure inside the apparatus during operation is at most 1 MPa (G) (1 MPa in gauge pressure) or less. Is desirable. The reason for this is that, for example, steam can be generated from low-temperature waste heat to enable power generation using waste heat energy of low-temperature waste heat of about 100 ° C. or less, and the expansion turbine is kept low by keeping the pressure of the entire apparatus low. This is to keep the internal pressure of the generator 12 low. As such a working medium Y, for example, hydrofluoroether (HFE), fluorocarbon, fluoroketone, perfluoropolyether or the like can be used.

  The expansion turbine generator 12 includes a turbine and a generator, and generates three-phase AC power using the vaporized working medium Y supplied from the evaporator 11. The turbine is a rotating machine that rotates the turbine impeller by supplying the working medium Y from the evaporator 11. Said generator is provided with the rotor (rotor) couple | bonded with the axis | shaft of the turbine impeller, and the stator (stator) provided so that the outer periphery of a rotor might be enclosed, and a rotor is rotationally driven by a turbine. To generate three-phase AC power.

  The condenser 13 is supplied with a working medium Y discharged from the expansion turbine generator 12 and a cooling medium (referred to as “cooling water Z” in the present embodiment) through separate paths, and performs heat exchange inside. The working medium Y is cooled and condensed. In FIG. 1, four condensers 13 connected in parallel are shown, but the number of condensers 13 may be 1 to 3, or 5 or more. The reservoir tank 14 is a tank that temporarily stores the working medium Y condensed by the condenser 13. The pump 15 pressurizes the working medium Y condensed by the condenser 13 and temporarily stored in the reservoir tank 14, and sends it to the evaporator 11.

  Next, a specific configuration of the waste heat power generation apparatus 10 will be described. FIG. 2 is a perspective view of a waste heat power generator according to an embodiment of the present invention. In FIG. 2, components corresponding to those shown in FIG. As shown in FIG. 2, in addition to the evaporators 11 to 15 and the like described above, the waste heat power generation apparatus 10 includes a hot water supply pipe Q1, a hot water recovery pipe Q2, a circulation pipe Q3 (circulation flow path), and a cooling water supply pipe Q4. And a cooling water recovery pipe Q5 and a bypass channel Q6.

  The hot water supply pipe Q <b> 1 is a pipe for supplying the warm water X to the evaporator 11, and the hot water recovery pipe Q <b> 2 is a pipe for recovering the hot water X from the evaporator 11. The circulation pipe Q3 is a pipe for connecting the evaporator 11 to the pump 15 to circulate the working medium Y. The cooling water supply pipe Q4 is a pipe for supplying the cooling water Z to the condenser 13, and the cooling water recovery pipe Q5 is a pipe for recovering the cooling water Z from the condenser 13.

  The bypass flow path Q6 is connected to the circulation pipe Q3 on the upstream side of the expansion turbine generator 12 (upstream side of the shutoff valve V1) and on the downstream side of the expansion turbine generator 12 (downstream side of the main valve V2). It is the made flow path. This bypass flow path Q6 is provided to allow the working medium Y to flow while avoiding the expansion turbine generator 12 when the circulation pipe Q3 is closed by the shutoff valve V1.

  As shown in FIG. 2, the evaporator 11 is set in a box shape having a front surface 11 a facing in the horizontal direction and a back surface 11 b located on the back side of the front surface 11 a, and is supported by a base B. On the front surface 11a side of the evaporator 11, an inlet for hot water X connected to the hot water supply pipe Q1, an outlet for hot water X connected to the hot water recovery pipe Q2, and an inlet for the working medium Y connected to the circulation pipe Q3. And the exit is aggregated. The two evaporators 11 are connected in parallel to the circulation pipe Q3 of the working medium Y.

  The expansion turbine generator 12 is arranged in the middle of the circulation pipe Q3 so as to be positioned between the evaporator 11 and the condenser 13 in the flow direction of the working medium Y. Specifically, the expansion turbine generator 12 is positioned downstream of the shutoff valve V1 attached to the circulation pipe Q3 and upstream of the manual valve V2 attached to the circulation pipe Q3. It arrange | positions in the middle site | part of the circulation piping Q3.

  The expansion turbine generator 12 is removably attached to the circulation pipe Q3 by flanges F1 and F2 formed at the inlet and outlet of the working medium Y, respectively. That is, the expansion turbine generator 12 has a position downstream of the shutoff valve V1 (position where the flange F1 is engaged with the circulation pipe Q3: first position) and a position upstream of the manual valve V2 (flange F2 is Each of the positions engaged with the circulation pipe Q3 (second position) is detachably attached to the circulation pipe Q3. This is because maintenance of the expansion turbine generator 12 can be easily performed in a short time.

  The expansion turbine generator 12 includes a port PT for collecting the working medium Y inside the expansion turbine generator 12 and supplying the working medium Y to the inside of the expansion turbine generator 12. The port PT is connected to a medium recovery device 20 (see FIG. 4B) for recovering the working medium Y before the maintenance of the expansion turbine generator 12 is started, and the maintenance of the expansion turbine generator 12 is completed. Later, a medium filling device 40 (see FIG. 4C) for supplying (filling) the working medium Y is connected.

  During maintenance of the expansion turbine generator 12, the circulation pipe Q3 is closed by the shutoff valve V1 and the manual valve V2, as will be described later. For this reason, the working medium Y remaining in the circulation pipe Q3 partitioned by the shutoff valve V1 and the manual valve V2 is also recovered from the port portion PT. The working medium Y supplied from the port part PT to the inside of the expansion turbine generator 12 is also supplied to the circulation pipe Q3 partitioned by the shutoff valve V1 and the manual valve V1.

  The expansion turbine generator 12 is supported by the gantry B so as to be disposed slightly above the evaporator 11 and the condenser 13. The reason why the expansion turbine generator 12 is arranged in this way is that, even if the working medium Y aggregates in the circulation pipe Q3 during the operation of the waste heat power generation apparatus 10, the working medium Y is expanded in the liquid state. This is to prevent supply to the machine 12.

  The condenser 13 is shaped in a box shape having a front surface 13a facing in the horizontal direction and a back surface 13b located on the back side of the front surface 13a, and is supported by the gantry B. On the side of the front face 13a of the condenser 13, the inlet of the cooling water Z connected to the cooling water supply pipe Q4, the outlet of the cooling water Z connected to the cooling water recovery pipe Q5, and the operation connected to the circulation pipe Q3 The inlet and outlet of the medium Y are collected. The four condensers 13 are connected in parallel to the circulation pipe Q3 for the working medium Y. In addition, two of the four condensers 13 are disposed to face the two evaporators 11 so that the back surface 13b faces the back surface 11b of the evaporator 11 as shown in FIG.

  The reservoir tank 14 is supported by the gantry B so as to be disposed below the condenser 13, and is disposed between the condenser 13 and the pump 15 in the flow direction of the working medium Y. The pump 15 is supported by the gantry B so as to be disposed at the lowermost part of the waste heat power generation apparatus 10, and is disposed between the reservoir tank 14 and the evaporator 11 in the flow direction of the working medium Y.

  The shutoff valve V1 is a valve that automatically shuts off (closes) the circulation pipe Q3 and stops the supply of the working medium Y to the expansion turbine generator 12 when the waste heat power generation apparatus 10 is in an operation stop state. The upstream side of the expansion turbine generator 12 is provided for the circulation pipe Q3. Note that the waste heat power generation apparatus 10 is in an operation stop state, for example, during maintenance of the expansion turbine generator 12 or in an emergency when an abnormality occurs.

  The manual valve V2 is a valve (a ball valve, a gate valve, a butterfly valve, or the like) that closes or opens the circulation pipe Q3 by an operator's operation, for example, and is provided for the circulation pipe Q3 on the downstream side of the expansion turbine generator 12. It has been. The manual valve V2 is configured to close the circulation pipe Q3 before the maintenance of the expansion turbine generator 12 is started by the operator's operation, and to open the circulation pipe Q3 after the maintenance is completed.

  Here, the shut-off valve V1 and the manual valve V2 are positions that can be attached to the circulation pipe Q3, and are provided at positions where the distance from the expansion turbine generator 12 becomes as short as possible in the flow direction of the working medium Y. . This is to reduce the time required for recovery and refilling of the working medium Y during maintenance of the expansion turbine generator 12 by minimizing the volume of the circulation pipe Q3 partitioned by the shutoff valve V1 and the manual valve V2. It is.

  The bypass valve V3 is a valve provided in the above-described bypass flow path Q6 (a flow path for flowing the working medium Y by avoiding the expansion turbine generator 12 when the circulation pipe Q3 is closed by the shutoff valve V1). It is. The bypass valve V3 closes the bypass flow path Q6 when the shut-off valve V1 opens the circulation pipe Q3, and opens the bypass flow path Q6 when the shut-off valve V1 closes the circulation pipe Q3. To do.

  In addition, the waste heat power generation apparatus 10 of the present embodiment includes a recovery pipe Q7 for recovering the working medium Y from the liquid pool portion (a portion where the liquefied working medium Y remains). FIG. 3 is a perspective view showing a recovery pipe provided in the waste heat power generator according to the embodiment of the present invention. In FIG. 3, illustrations of components unnecessary for explaining the recovery pipe Q7 are omitted. Also in FIG. The components corresponding to those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  As shown in FIG. 3, the recovery pipe Q <b> 7 includes a bottom P <b> 1 of the expansion turbine generator 12, a part P <b> 2 where the working medium Y flows into the evaporator 11 (hereinafter referred to as “working medium inflow part P <b> 2”), and a reservoir tank 14. Connect. When the waste heat power generator 10 is stopped and maintenance is performed, the recovery pipe Q7 supplies the liquefied working medium Y remaining in the bottom P1 of the expansion turbine generator 12 and the working medium inflow site P2 to the reservoir tank 14 when maintenance is performed. It is to be collected.

  Here, since the working medium Y liquefied inside the expansion turbine generator 12 is guided to the bottom of the expansion turbine generator 12 by gravity, the bottom of the expansion turbine generator 12 becomes a liquid pool. Further, the working medium Y liquefied inside the evaporator 11 is guided to the working medium inflow site P2 by gravity, whereas the working medium Y guided to the working medium inflow site P2 hardly flows to the reservoir tank 14 side. Therefore, the working medium inflow portion P2 becomes a liquid pool portion.

  The recovery pipe Q7 is provided with a valve V11 near the bottom P1 of the expansion turbine generator 12, and with a valve V12 near the working medium inflow site P2. These valves V11 and V12 are valves that close or open the recovery pipe Q7 by an operator's operation, for example. Specifically, when the waste heat power generator 10 is in an operating state, both the valves V11 and V12 are closed. Further, when recovering the working medium Y remaining at the bottom P1 of the expansion turbine generator 12, the valve V11 is opened, and when recovering the working medium Y remaining at the working medium inflow portion P2, the valve V12 is opened. Opened.

  Next, operation | movement of the waste heat power generator 10 in the said structure is demonstrated easily. In the waste heat power generation apparatus 10 of the present embodiment, the working medium Y is converted into the evaporator 11 (two evaporators 11) → the expansion turbine generator 12 → the condenser 13 (four condensers 13) → the reservoir tank 14 → the pump 15. → Power generation in the expansion turbine generator 12 is performed by changing the state of the working medium Y to liquid and gas while circulating in the order of the evaporator 11 (two evaporators 11).

  That is, the working medium Y evaporated by the heat of the hot water X in the evaporator 11 is supplied to the expansion turbine generator 12, condensed by the cooling water Z in the condenser 13, and temporarily stored in the reservoir tank 14. Then, it is sent again to the evaporator 11 via the pump 15. In the process of such a cyclic state change of the working medium Y, the expansion turbine generator 12 is driven by the working medium Y to generate electric power.

  Next, the maintenance procedure of the expansion turbine generator 12 provided in the waste heat power generator 10 will be described. FIG. 4 is a diagram for explaining a maintenance procedure in one embodiment of the present invention. In performing maintenance of the expansion turbine generator 12, first, the worker instructs the waste heat power generator 10 to stop the operation. As a result, the waste heat power generation apparatus 10 is in a state where the pump 15 is stopped and the circulation pipe Q3 is automatically shut off (closed) by the shutoff valve V1.

  Next, the operator operates the manual valve V2 provided in the waste heat power generation apparatus 10 to perform the operation of closing the circulation pipe Q3. Thereby, as shown in FIG. 4A, the expansion turbine generator 12 to be maintained is separated from the circulation pipe Q3 by the shutoff valve V1 and the manual valve V2 (inflow of the working medium Y to the expansion turbine generator 12). And a state in which the working medium Y does not flow out from the expansion turbine generator 12).

  Subsequently, as shown in FIG. 4 (b), the operator connects the medium recovery device 20 to the port portion PT provided in the expansion turbine generator 12, and operates the working medium Y inside the expansion turbine generator 12 (blocking). The work of collecting the working medium Y remaining in the circulation pipe Q3 partitioned by the valve V1 and the manual valve V2 in the collection tank 30 is performed. In the waste heat power generation apparatus, there is a portion where the liquefied low boiling point working medium remains (a portion that becomes a liquid pool) due to the structure of the piping through which the low boiling point working medium is circulated. For example, the bottom part of the steam turbine or the low-boiling working medium flows into the waste heat recovery unit. In order to extract the low boiling point working medium remaining in such a part, it is necessary to vaporize and collect the low boiling point working medium, so that there is a problem that it takes a long time to collect the low boiling point working medium. . Here, before performing the above-described operation of collecting the working medium Y (including the working medium Y remaining in the circulation pipe Q3 partitioned by the shutoff valve V1 and the manual valve V2) in the collection tank 30, When the valve V11 (see FIG. 3) provided in the recovery pipe Q7 is operated to open, the working medium Y remaining on the bottom P1 of the expansion turbine generator 12 is recovered in the reservoir tank 14. You can also

  When the above operation is completed, the operator performs an operation of removing the expansion turbine generator 12 from the waste heat power generation apparatus 10. Specifically, the flange F1 formed in the expansion turbine generator 12 shown in FIG. 2 is removed from the circulation pipe Q3 (circulation pipe Q3 located on the upstream side of the expansion turbine generator 12), and the flange F2 is connected to the circulation pipe Q3. The operation of removing from the circulation pipe Q3 located on the downstream side of the expansion turbine generator 12 is performed. Since the circulation pipe Q3 is closed by the shutoff valve V1 and the manual valve V2, the working medium Y is not released into the atmosphere even if the expansion turbine generator 12 is removed.

  When the expansion turbine generator 12 is removed from the waste heat power generator 10, maintenance of the expansion turbine generator 12 is performed by an operator. For example, replacement of a turbine impeller provided in the expansion turbine generator 12, replenishment of lubricant, cleaning, and other maintenance are performed. When the expansion turbine generator 12 is damaged, the expansion turbine generator 12 may be replaced.

  When the maintenance of the expansion turbine generator 12 is completed, the worker performs an operation of attaching the expansion turbine generator 12 that has been maintained to the waste heat power generator 10. Specifically, the flange F1 formed in the expansion turbine generator 12 is attached to the circulation pipe Q3 (circulation pipe Q3 located on the upstream side of the expansion turbine generator 12), and the flange F2 is connected to the circulation pipe Q3 (expansion turbine power generation). The work of attaching to the circulation pipe Q3) located on the downstream side of the machine 12 is performed.

  Subsequently, as shown in FIG. 4C, the worker connects the medium filling device 40 to the port portion PT provided in the expansion turbine generator 12, and expands the working medium Y collected in the collection tank 30. The inside of the turbine generator 12 (including the inside of the working medium Y remaining in the circulation pipe Q3 partitioned by the shutoff valve V1 and the manual valve V2) is filled. During this operation, the valve V11 provided in the recovery pipe Q7 is closed.

  When the above operation is completed, the waste heat power generation apparatus 10 is in the same state as that shown in FIG. That is, the working medium Y is filled throughout the expansion turbine generator 12 and the entire circulation pipe Q3, and the circulation pipe Q3 is closed by the shutoff valve V1 and the manual valve V2. Finally, the operator operates the manual valve V2 provided in the waste heat power generation apparatus 10 to open the circulation pipe Q3, and instructs the waste heat power generation apparatus 10 to start the operation. Then, in the waste heat power generation apparatus 10, the shutoff valve V1 is opened, the circulation pipe Q3 is opened, and the driving of the pump 15 is started, so that the operation of the waste heat power generation apparatus 10 described above is performed.

  As described above, in the present embodiment, the shutoff valve V1 that shuts off (closes) the circulation pipe Q3 is provided upstream of the expansion turbine generator 12, and the circulation pipe Q3 is closed downstream of the expansion turbine generator 12. A manual valve V2 is provided. Then, with the shutoff valve V1 and manual valve V2, the expansion turbine generator 12 is made independent from the circulation pipe Q3 by the circulation pipe Q3, and the working medium Y is partially recovered and refilled. Thereby, since the amount of the working medium Y to be collected and refilled can be reduced, the time required for collecting and refilling the working medium Y can be shortened.

  In the present embodiment, a recovery pipe Q7 is provided to connect the liquid reservoir (for example, the bottom of the expansion turbine generator 12) where the liquefied working medium Y remains and the reservoir tank 14 to remain in the liquid reservoir. The working medium Y is collected in the reservoir tank 14. As a result, there is no need to vaporize and recover the working medium Y remaining in the liquid pool portion as in the prior art, so that the time required for collecting and refilling the working medium Y can be shortened.

  In the above embodiment, an example in which the working medium Y is partially collected and refilled with respect to the expansion turbine generator 12 and the working medium Y remaining at the bottom of the expansion turbine generator 12 is collected in the reservoir tank 14 will be described. did. When it is necessary to collect all the working medium Y used in the waste heat power generation apparatus 10, it is also possible to collect the working medium Y remaining in the liquid pool portion in the circulation pipe Q3 as shown in FIG. .

  FIG. 5 is a diagram for explaining a method of recovering the working medium from the liquid pool portion in the circulation pipe. As shown in FIG. 5, a recovery pipe Q7 connected to the reservoir tank 14 is connected to a liquid pool portion (working medium inflow portion P2) in the circulation pipe Q3. Therefore, if the operator operates the valve V12 provided in the recovery pipe Q7 to open it, the liquefied working medium Y remaining in the working medium inflow site P2 is collected in the reservoir tank 14.

  When the operation of the waste heat power generation apparatus 10 is stopped, most of the working medium Y used in the waste heat power generation apparatus 10 (excluding the working medium Y remaining in the working medium inflow portion P2) is circulated in the circulation pipe Q3. Is stored in the reservoir tank 14 via For this reason, as shown in FIG. 5, the medium recovery device 20 is connected to the reservoir tank 14 and the operating medium Y stored in the reservoir tank 14 is recovered in the recovery tank 30. Most of the working medium Y including can be recovered in the recovery tank 30.

  As mentioned above, although the waste heat power generator by one Embodiment of this invention was demonstrated, this invention is not restrict | limited to the said embodiment, It can change freely within the scope of the present invention. For example, in the above embodiment, the shutoff valve V1 is provided on the upstream side of the expansion turbine generator 12, and the upstream side of the expansion turbine generator 12 is shut off (closed) by the shutoff valve V1 during maintenance of the expansion turbine generator 12. ) Explained. However, a valve (similar to the manual valve V2) that closes the upstream side of the expansion turbine generator 12 during maintenance of the expansion turbine generator 12 may be provided together with the cutoff valve V1 or instead of the cutoff valve V1.

  Moreover, in the said embodiment, the case where the valve which closes the downstream of the expansion turbine generator 12 at the time of the maintenance of the expansion turbine generator 12 was the manual valve V2 was mentioned as an example, and was demonstrated. However, this valve may be a valve other than the manual valve V2 (for example, a valve whose open / close state is controlled by a control device (not shown)).

  Moreover, in the said embodiment, although the waste heat energy used as the hot water X was collect | recovered as electrical energy, this invention is not limited to this, For example, you may use waste gas as a heat source. Further, the heat source is not limited to waste heat such as waste gas or waste hot water. Further, as the above-described expansion turbine generator 12, a radial turbine generator such as a centrifugal expansion turbine generator or a mixed flow expansion turbine generator may be used.

DESCRIPTION OF SYMBOLS 10 ... Circulation piping, 11 ... Evaporator, 12 ... Expansion turbine generator, 13 ... Condenser, 14 ... Reservoir tank, 15 ... Pump, P1 ... Bottom part, P2 ... Working-medium inflow site, PT ... Port part, Q3 ... Circulation Piping, Q7 ... Recovery pipe, V1 ... Shut-off valve, V2 ... Manual valve, X ... Hot water, Y ... Working medium, Z ... Cooling water

Claims (6)

An evaporator that evaporates the working medium by exchanging heat between the waste heat medium and the working medium, a turbine generator that generates electric power by supplying the working medium from the evaporator, and discharged from the turbine generator The operation provided with a condenser for condensing the working medium by exchanging heat between the working medium and a cooling medium, and a pump for sending the working medium condensed in the condenser toward the evaporator In a waste heat power generation apparatus including a medium circulation channel,
A first valve provided upstream of the turbine generator to close the circulation flow path;
A waste heat power generator, comprising: a second valve provided downstream of the turbine generator and closing the circulation passage.   The turbine generator collects the circulation channel partitioned by the first valve and the second valve and the working medium remaining in the turbine generator, and the first valve and the second valve The waste heat power generator according to claim 1, further comprising a port portion for supplying the working medium into the partitioned circulation passage and the turbine generator.   The turbine generator is detachably attached to the circulation flow path at each of a first position downstream from the first valve and a second position upstream from the second valve. The waste heat power generator according to claim 1 or 2, characterized by.   4. The valve according to claim 1, wherein the first valve is a shut-off valve that automatically shuts off the circulation flow path when the waste heat power generator is in an operation stop state. 5. The waste heat power generator according to one item. A tank that is provided between the condenser and the pump and temporarily stores the working medium condensed in the condenser;
The waste heat power generator according to any one of claims 1 to 4, further comprising: a recovery pipe that connects the liquid pool where the liquefied working medium remains and the tank.   6. The waste heat power generation apparatus according to claim 5, wherein the liquid pool portion is a bottom portion of the turbine generator or a portion where the working medium flows into the evaporator.

Images