CN111076599A - Heat recovery system - Google Patents

Heat recovery system Download PDF

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Publication number
CN111076599A
CN111076599A CN201910987576.4A CN201910987576A CN111076599A CN 111076599 A CN111076599 A CN 111076599A CN 201910987576 A CN201910987576 A CN 201910987576A CN 111076599 A CN111076599 A CN 111076599A
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CN
China
Prior art keywords
flow path
heat
fluid
pipe
heat source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910987576.4A
Other languages
Chinese (zh)
Inventor
上田裕介
中井基生
松原周
胁田恭之
森本泰弘
远藤康浩
盛昭雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JTEKT Corp
JTEKT Thermo Systems Corp
Original Assignee
Koyo Thermo Systems Co Ltd
JTEKT Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2018198619A external-priority patent/JP7108161B2/en
Priority claimed from JP2018235453A external-priority patent/JP7108162B2/en
Application filed by Koyo Thermo Systems Co Ltd, JTEKT Corp filed Critical Koyo Thermo Systems Co Ltd
Publication of CN111076599A publication Critical patent/CN111076599A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/006—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for regenerative heat-exchange apparatus
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/58—Oils
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • C21D1/64—Quenching devices for bath quenching with circulating liquids
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • 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
    • 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
    • F01K23/06—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 combustion heat from one cycle heating the fluid in another cycle
    • F01K23/064—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 combustion heat from one cycle heating the fluid in another cycle in combination with an industrial process, e.g. chemical, metallurgical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Abstract

The heat recovery system includes: a plurality of heat source units; a heat exchanger connected to the heat source portion via a primary flow path portion (24) through which the first fluid flows, and configured to perform heat exchange between the first fluid and the second fluid; a valve mechanism (22) configured to select a flow path connecting the heat exchanger and the heat source portion; and a power generation unit (14) connected to the heat exchanger via a secondary flow path portion (26) through which the second fluid flows, and configured to generate electric power using the second fluid. The timing at which the temperature of the first fluid in one heat source portion increases is different from the timing at which the temperature of the first fluid in the other heat source portion increases. The valve mechanism (22) operates in accordance with the timing at which the temperature of the first fluid in each heat source portion rises.

Description

Heat recovery system
Technical Field
The present invention relates to a heat recovery system.
Background
Binary power generation is known in which hot water or steam is used as a heat source to heat and vaporize a heating medium having a low boiling point to generate electric power. Binary power generation can efficiently utilize waste heat at relatively low temperatures and is employed for, for example, geothermal power generation or the like.
In recent years, there has been an attempt to use waste heat output from plants or facilities for, for example, binary power generation (see, for example, japanese patent application laid-open No. 2017-129059).
Fig. 8 shows a facility in which a binary power generating unit 91 (hereinafter referred to as "power generating unit 91") is used in combination with a heat treatment apparatus 90 that performs heat treatment (hardening treatment, i.e., quenching treatment) of metal parts. The facility includes an oil tank 92 of the heat treatment apparatus 90, a power generation unit 91, and a heat exchanger 93. The oil tank 92 stores a cooling liquid 99. The oil tank 92 and the heat exchanger 93 are connected to each other by a primary pipe 94. The heat exchanger 93 and the power generation unit 91 are connected to each other by a secondary pipe 95. The heat treatment (hardening treatment, i.e., quenching treatment) is performed by immersing the object 100, which has been heated, in the cooling liquid 99 in the oil tank 92, so that the object 100 is cooled. This heat treatment temporarily raises the temperature of the cooling liquid 99. When the cooling liquid 99 flows through the primary pipe 94, heat (waste heat) of the flowing cooling liquid 99 is transferred (heat exchange is performed) in the heat exchanger 93 to the heating medium 98 flowing through the secondary pipe 95. The power generation unit 91 generates electric power using heat of the heating medium 98, and the cooling liquid 99 is cooled.
In this way, the power generation unit 91 generates electric power using the cooling liquid 99 whose temperature has been increased as a heat source. However, in order to generate electric power, it is necessary that the temperature of the cooling liquid 99 should be a predetermined temperature or higher.
In the above-described heat treatment apparatus 90, the time interval (cycle time T in fig. 9) during which the object 100 is immersed in the oil tank 92 is long (for example, 30 minutes), and the time interval (cycle time T) varies depending on the condition (for example, the weight of the object 100). When the object 100, which has been heated, is immersed in the oil tank 92, the temperature of the cooling liquid 99 rises. When the temperature of the cooling liquid 99 is higher than the predetermined temperature a, electric power can be generated for a predetermined time (Δ t in fig. 9). However, when the temperature of the cooling liquid 99 falls to the predetermined temperature a, electric power cannot be generated.
In the case where the heat of the cooling liquid 99 in the heat treatment device 90 is used for power generation, the temperature of the cooling liquid 99 varies depending on the processing conditions of the object 100 such as the heating temperature, the weight, and the like, and also varies depending on the elapsed time. If such a variation is irregular, the power generation performed by the power generation unit 91 is unstable, and the power generation unit 91 is likely to be inoperative for many periods of time. Such a problem may occur not only in the case where the power generation unit 91 is used in combination with the above-described heat treatment apparatus 90, but also in the case where the power generation unit 91 is used in other facilities.
Fig. 15 shows a facility in which a binary power generating unit 191 (hereinafter referred to as "power generating unit 191") is used in combination with a heat treatment apparatus 190 that performs heat treatment (hardening treatment, i.e., quenching treatment) of a metal component. In this facility, the oil tank 192 of the heat treatment apparatus 190 and the power generation unit 191 are connected to each other by a pipe. The oil tank 192 stores a cooling liquid 199 that cools the object that has been heated. The power generation unit 191 includes a heat exchanger (evaporator) 193, a power generation device 195 including an expansion unit 194, a condenser 196, and the like. The oil tank 192 and the heat exchanger 193 are connected to each other by a pipe 197 on the primary side. The heat exchanger 193 and the expansion unit 194 are connected to each other through a pipe 198 on the secondary side.
The heat treatment (hardening treatment, i.e., quenching treatment) is performed by immersing the object, which has been heated by the heat treatment apparatus 190, in the cooling liquid 199 in the oil tank 192 so that the object is cooled. This heat treatment raises the temperature of the cooling liquid 199. The cooling liquid 199 whose temperature has been increased flows through the pipe 197 on the primary side, and the heat of the cooling liquid 199 is transferred (heat exchange is performed) to the heating medium 200 on the secondary side in the heat exchanger 193. The heating medium 200 that has been vaporized by heat exchange is input to the expansion unit 194 through the pipe 198 on the secondary side to generate electric power. The heating medium 200 having passed through the expansion unit 194 flows to the condenser 196 to be liquefied, and returns to the heat exchanger 193.
When the cooling liquid 199 is supplied from the oil tank 192 to the heat exchanger 193 through the pipe 197 on the primary side, the heat of the cooling liquid 199 whose temperature has been increased is released to the atmospheric environment. In order to suppress heat release, the tube 197 on the primary side is covered with a heat insulating material. The outside temperature around the pipes 197 on the primary side is about 20 ℃ (normal temperature, i.e., normal temperature), while the temperature of the cooling liquid 199 flowing through the pipes 197 on the primary side is, for example, about 120 ℃ to 130 ℃, and there is a large temperature difference therebetween. Thus, as the cooling liquid 199 flows through the tubes 197 on the primary side, the temperature of the cooling liquid 199 decreases, even if an insulating material is provided. That is, the thermal energy of the cooling liquid 199 is reduced by the heat released from the tubes 197 on the primary side.
The temperature of the cooling liquid (first fluid) 199 flowing through the pipe 197 on the primary side significantly affects the power generation efficiency of the power generation device 195.
Disclosure of Invention
The present invention provides a heat recovery system in which power generation can be performed efficiently even in the case where, for example, the temperature of waste heat obtained from a heat source portion varies. The present invention also provides a heat recovery system capable of improving power generation efficiency by suppressing a temperature drop of the first fluid.
A first aspect of the invention relates to a heat recovery system comprising: a plurality of heat source portions configured to increase a temperature of the first fluid using heat obtained by processing the object; a heat exchanger connected to the plurality of heat source portions via a primary flow path portion through which the first fluid flows, and configured to perform heat exchange between the first fluid and a second fluid; a valve mechanism that is provided in the primary flow path portion and that is configured to select a flow path connecting the heat exchanger and the plurality of heat source portions; and a power generation unit connected to the heat exchanger via a secondary flow path portion through which the second fluid flows, and configured to generate electric power using the second fluid as an input. A timing at which the temperature of the first fluid in one of the plurality of heat source portions increases is different from a timing at which the temperature of the first fluid in another one of the plurality of heat source portions increases, and the valve mechanism operates in accordance with the timing at which the temperature of the first fluid in each of the plurality of heat source portions increases.
In the heat recovery system according to the above aspect, the plurality of heat source portions share the power generation unit. The timing at which the temperature of the first fluid in the one heat source portion increases is different from the timing at which the temperature of the first fluid in the other heat source portion increases. Therefore, when the first fluid, the temperature of which has been raised by the one heat source portion, is supplied to the heat exchanger, heat exchange (i.e., transfer of heat) is performed between the first fluid and the second fluid, and the power generation unit generates electric power using the second fluid as an input. After that, even in the case where the temperature of the one heat source portion decreases and it becomes impossible to generate electric power, the first fluid whose temperature has been raised by the other heat source portion is supplied to the heat exchanger. Thereby, heat exchange (i.e. transfer of heat) is performed between the first fluid and the second fluid, and the power generation unit may generate electrical power using the second fluid as an input. Therefore, the power generation unit is given more operation opportunities by making different respective timings at which the temperature of the first fluid rises between the plurality of heat source portions. Therefore, the power generation unit can efficiently perform power generation. Note that the timing of starting the cycle of the heat source portion (heat treatment apparatus) may be intentionally shifted on the heat source portion side (heat treatment apparatus side).
The primary flow path part may include a main flow path connecting the plurality of heat source parts and the heat exchanger, and a coupling flow path connecting the plurality of heat source parts to each other so that the first fluid is movable between the plurality of heat source parts; and the valve mechanism may include a valve configured to switch the flow path such that, in a case where the temperature of the first fluid in the one heat source portion increases, the first fluid flows to the other heat source portion through the coupling flow path, and the first fluid flows to the heat exchanger through the other heat source portion. In this configuration, the flow path is switched such that, in the case where the temperature of the first fluid in the one heat source portion is increased, the first fluid flows to the other heat source portion through the coupling flow path, and the first fluid flows to the heat exchanger through the other heat source portion. On the other hand, the flow path is switched so that, in the case where the temperature of the first fluid in the other heat source portion is increased, the first fluid flows to the one heat source portion through the coupling flow path, and the first fluid flows to the heat exchanger through the one heat source portion. When the heat source portions are connected to each other by the coupling flow path as in the above configuration, the heat source portions may be regarded as a single heat source portion, and the volume of the first fluid serving as the heat source is increased. Therefore, the temperature increase of the first fluid due to the heat obtained by processing the object is mitigated, but the temperature of the first fluid that has been increased is not easily decreased. Therefore, the time (i.e., the period of time) during which the power generation unit can generate electric power can be extended as compared with the related art. Further, as described above, the power generation unit is given more operation opportunities by making different respective timings at which the temperature of the first fluid rises between the plurality of heat source portions. Therefore, the power generation unit can further efficiently perform power generation.
A second aspect of the invention relates to a heat recovery system comprising: a plurality of heat source portions configured to increase a temperature of the first fluid using heat obtained by processing the object; a heat exchanger connected to the plurality of heat source portions via a primary flow path portion through which the first fluid flows, and configured to perform heat exchange between the first fluid and a second fluid; a valve mechanism that is provided in the primary flow path portion and that is configured to select a flow path connecting the heat exchanger and the plurality of heat source portions; and a power generation unit connected to the heat exchanger via a secondary flow path portion through which the second fluid flows, and configured to generate electric power using the second fluid as an input. The primary flow path portion includes a main flow path that connects the plurality of heat source portions and the heat exchanger, and a coupling flow path that connects the plurality of heat source portions to each other so that the first fluid is movable between the plurality of heat source portions. The valve mechanism includes a valve configured to switch the flow path such that, in a case where the temperature of the first fluid in one of the plurality of heat source portions increases, the first fluid flows to another one of the plurality of heat source portions through the coupling flow path, and the first fluid flows to the heat exchanger through the another one of the heat source portions.
With the heat recovery system according to the above aspect, since the heat source portions are connected to each other by the coupling flow path, the heat source portions can be regarded as a single heat source portion, and the volume of the first fluid serving as the heat source increases. Therefore, the temperature increase of the first fluid due to the heat obtained by processing the object is mitigated, but the temperature of the first fluid that has been increased is not easily decreased. Therefore, the time (i.e., the period of time) during which the power generation unit can generate electric power can be extended as compared with the related art. Therefore, the power generation unit can efficiently perform power generation.
The power generating unit may be a binary power generating unit. In this case, waste heat at a relatively low temperature can be effectively utilized.
According to the above aspect of the present invention, for example, even in the case where the temperature of the waste heat obtained from the heat source portion varies, the power generation can be performed efficiently.
A third aspect of the invention relates to a heat recovery system comprising: a primary-side flow path through which a first fluid flows from a heat source; a heat exchanger configured to perform heat exchange between the first fluid and the second fluid flowing through the primary-side flow path; a secondary-side flow path through which the second fluid flows; a power generation device configured to generate electric power using the second fluid in the secondary-side flow path; and a condenser configured to cool and condense the second fluid that has passed through the power generation device. The primary-side flow path includes a multi-wall tube including an inner flow path portion through which the first fluid passes and an outer flow path portion provided around the inner flow path portion. The outer flow path portion is supplied with heated air obtained by heat output from a waste heat output portion that is at least one of the heat source, another heat source, and the condenser.
With the heat recovery system according to the above-described aspect, it is possible to reuse the energy discarded as waste heat in the related art. That is, by supplying heated air obtained by heat output from the waste heat output portion to the outer flow path portion of the multiple-wall tube, it is possible to suppress a decrease in temperature of the first fluid flowing through the inner flow path portion of the multiple-wall tube. As a result, the efficiency of performing power generation using the second fluid can be improved.
The primary-side flow path may include a first tube that allows the first fluid to flow from the heat source to the heat exchanger; the first tube may comprise the multi-walled tube; and the heat recovery system may include a connection pipe through which the heated air is supplied from the waste heat output portion to the outer flow path portion of the multi-wall pipe. With this configuration, it is possible to effectively suppress a decrease in the temperature of the first fluid flowing to the heat exchanger through the first pipe.
The multi-walled pipe may include a primary pipe and a secondary pipe; a heat insulating material may be provided at an outer periphery of the main pipe, and an inside of the main pipe may serve as the inner flow path portion; and the sub pipe may be disposed around an outer peripheral side of the main pipe so as to configure a flow path having an annular cross section that serves as the outer flow path portion. In this configuration, the multiple-walled pipe has a double-walled configuration in which an outer flow path portion (sub-pipe) through which heated air flows is provided around an outer peripheral side of an inner flow path portion (main pipe) through which the first fluid flows. Therefore, the function of suppressing the temperature decrease of the first fluid can be enhanced.
The waste heat output may be the condenser that cools and condenses the second fluid; and the second fluid may be air cooled by a fan. In this case, the fan condenses the second fluid and generates heated air having a flow velocity, and the heated air is directly supplied to the primary-side flow path.
The heat recovery system may further include: a connection pipe connecting the waste heat output and the outer flow path portion of the multi-walled pipe, the connection pipe configured to supply the heated air from the waste heat output; a first valve configured to allow and prevent the heated air from flowing from the connecting tube into the outer flow path portion; a discharge pipe connected to the outer flow path portion to discharge the heated air; and a second valve configured to allow and prevent the heated air from flowing out of the outer flow path portion to the discharge pipe. In this case, when the second valve is closed to prevent the heated air from flowing out of the discharge pipe, the heated air resides in the outer flow path portion. This makes it possible to raise the temperature of the outer flow path portion for a predetermined time.
The multi-walled pipe may include a main pipe, a sub pipe, and an outer pipe; a heat insulating material may be provided at an outer periphery of the main pipe, and an inside of the main pipe may serve as the inner flow path portion; the sub pipe may be disposed around an outer peripheral side of the main pipe so as to configure a flow path having an annular cross section that serves as the outer flow path portion; and the outer pipe may be disposed around an outer circumferential side of the sub-pipe, thereby configuring a vacuum space having a circular cross section. In this configuration, the multiple-wall tube has a triple-wall configuration in which an outer flow path portion (sub-tube) through which heated air flows is provided around an outer peripheral side of an inner flow path portion (main tube) through which the first fluid flows, and further, a vacuum space is provided around an outer periphery of the outer flow path portion. Therefore, the function of suppressing the temperature decrease of the first fluid can be further enhanced.
With the above aspect of the present invention, it is possible to improve the power generation efficiency by suppressing the temperature drop of the first fluid.
Drawings
Features, advantages and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like reference numerals denote like elements, and in which:
fig. 1 is a plan view showing an example of a heat recovery system according to a first embodiment of the present invention;
FIG. 2 shows an oil tank, a heat exchanger and a power generation unit;
FIG. 3 shows an oil tank, a heat exchanger and a power generation unit;
FIG. 4 shows an oil tank, heat exchanger and power generation unit;
FIG. 5 is a graph showing a temporal change in temperature in each chamber (e.g., a hardening chamber) for heat treatment in the first furnace and the second furnace;
FIG. 6 shows the relationship between the temperature of the cooling liquid in each of the first and second furnaces and whether the power generating unit is capable of generating electricity;
FIG. 7 shows the relationship between the temperature of the cooling liquid in each of the first and second furnaces and whether the power generating unit is capable of generating electricity;
FIG. 8 illustrates a facility according to the related art in which a binary power generation unit is used in combination with a heat treatment apparatus for heat treatment of metal parts;
fig. 9 shows a relationship between the temperature of the cooling liquid and whether or not the power generation unit is capable of generating electric power in the related art;
fig. 10 is a schematic view showing an example of a heat recovery system according to a second embodiment of the present invention;
FIG. 11 is a cross-sectional view showing an example of a multi-walled pipe;
FIG. 12 is a longitudinal plan view showing an example of a multi-walled pipe;
FIG. 13 is a cross-sectional view showing a variation of the multiple wall tube;
fig. 14 shows a schematic configuration of a condenser, a connection pipe, a primary-side flow path, and surrounding components; and is
Fig. 15 shows a facility according to the related art in which a binary power generation unit is used in combination with a heat treatment device.
Detailed Description
Fig. 1 is a plan view showing an example of a heat recovery system according to a first embodiment. In the heat recovery system 10, the power generation unit 14 generates electric power using waste heat from the heat treatment apparatus 12 that performs heat treatment on metal parts. Examples of metal components include mechanical components such as bearing rings, shafts and pins of rolling bearings. The heat treatment may be a hardening treatment (quenching treatment). For the heat treatment (see fig. 2), the metal member 7 (hereinafter referred to as "object 7") that has been heated is immersed in a cooling liquid (hardened oil, i.e., quenching oil) 18 in an oil tank 16 of the heat treatment apparatus 12 to be cooled. In this case, the temperature of the cooling liquid 18 rises. The heat of the cooling liquid 18 is used to generate electricity. That is, the oil tank 16 functions as a heat source portion, and the cooling liquid 18 functions as a heating medium (first fluid) on the primary side. The heat of the cooling liquid 18 is transferred to a medium (second fluid) 19 on the secondary side through a heat exchanger 20, and the power generation unit 14 generates electric power. Fig. 2 shows the oil tank 16, the heat exchanger 20, and the power generation unit 14. In the drawings, the same constituent elements are given the same symbols (reference numerals) to omit redundant description. In the present embodiment (see fig. 2), a plurality of objects 7 are accommodated in a basket 8, and the basket 8 is moved up and down by an actuator (not shown).
The heat recovery system 10 shown in fig. 1 includes two thermal treatment devices 12. The heat treatment device 12 on the upper side in fig. 1 will be referred to as "first furnace 12 a", and the heat treatment device 12 on the lower side will be referred to as "second furnace 12 b". The first furnace 12a and the second furnace 12b have the same configuration. The first furnace 12a and the second furnace 12b each include a first purge chamber 81, a first preheating chamber 82, a second preheating chamber 83, a carburizing diffusion chamber 84, a temperature decrease chamber 85, a soaking chamber 86, a hardening chamber (quenching chamber) 87, and a second purge chamber 88, which are arranged in this order from the upstream side (left side in fig. 1) in the advancing direction of the object 7. The hardening chamber 87 is provided with a respective oil tank 16. Since the heat recovery system 10 includes two heat treatment devices 12, the heat recovery system 10 includes two oil tanks 16. The tank 16 of the first furnace 12a will be referred to as "first tank 16 a". The oil tank 16 of the second furnace 12b will be referred to as "second oil tank 16 b".
In fig. 2, the heat recovery system 10 further includes a heat exchanger 20, the power generation unit 14, and a valve mechanism 22 in addition to the oil tank 16(16a and 16b) serving as a heat source portion. The heat recovery system 10 further includes a primary flow path portion 24 and a secondary flow path portion 26. The primary flow path portion 24 connects the oil tank 16(16a and 16b) and the heat exchanger 20, and allows the cooling liquid 18 to pass therethrough (i.e., the cooling liquid 18 flows through the primary flow path portion 24). The secondary flow path portion 26 connects the heat exchanger 20 and the power generation unit 14, and allows the heating medium 19 on the secondary side to flow therein (i.e., the heating medium 19 on the secondary side flows through the secondary flow path portion 26). The heating medium 19 on the secondary side may be a liquid with a relatively low boiling point.
The oil tank 16 stores a cooling liquid 18. As described above, when the object 7, which has been heated, is immersed in the cooling liquid 18, the object 7 is subjected to a heat treatment (hardening treatment, i.e., quenching treatment). In this case, the temperature of the cooling liquid 18 rises. That is, the temperature of the cooling liquid 18 is raised by the heat obtained when the object 7 is subjected to the heat treatment.
The heat exchanger 20 is connected to the two oil tanks 16a and 16b via a primary flow path portion 24 through which the cooling liquid 18 flows. In the heat exchanger 20, the heat of the cooling liquid 18 is transferred to the heating medium 19 on the secondary side. That is, the heat exchanger 20 performs heat exchange from the cooling liquid 18 to the heating medium 19 on the secondary side.
The primary flow path portion 24 includes a main flow path 28 and a coupling flow path 30. The main flow path 28 connects each of the oil tank 16a and the oil tank 16b to the heat exchanger 20. The coupling flow path 30 connects the oil tank 16a and the oil tank 16b to each other so that the cooling liquid 18 can move between the oil tank 16a and the oil tank 16 b. The main flow path 28 includes a first pipe 31, a second pipe 32, and a third pipe 33. The first pipe 31 connects the first tank 16a and the second tank 16 b. The first pipe 31 is provided with a first valve 34 and a second valve 35 that can be opened and closed. A second pipe 32 parallel to the first pipe 31 connects the first tank 16a and the second tank 16 b. The second pipe 32 is provided with a third valve 36 and a fourth valve 37 that can be opened and closed. The third pipe 33 connects the first pipe 31 and the second pipe 32. The third pipe 33 is provided with a pump 39 for circulating the cooling liquid 18 and a heat exchanger 20. One end of the third pipe 33 is connected to the flow path of the first pipe 31 between the first valve 34 and the second valve 35. The other end of the third pipe 33 is connected to the flow path of the second pipe 32 between the third valve 36 and the fourth valve 37.
The coupling flow path 30 is formed of a pipe, and is provided with a fifth valve 38 that can be opened and closed. Each of the valves 34, 35, 36, 37, and 38 is operated to open and close based on a command signal output from a control device (not shown). The control of the opening/closing operation may be performed by a control device that performs operation control (heat treatment control) on the first furnace 12a and the second furnace 12 b. The secondary flow path portion 26 includes a fourth pipe 40 and a pump 41, the pump 41 allowing the heating medium 19 on the secondary side to circulate between the heat exchanger 20 and the power generation unit 14.
The valve mechanism 22 is constituted by a first valve 34, a second valve 35, a third valve 36, a fourth valve 37, and a fifth valve 38. The valve mechanism 22 is provided in the primary flow path portion 24.
With the fifth valve 38 closed, the first valve 34 and the third valve 36 open, and the second valve 35 and the fourth valve 37 closed, the cooling liquid 18 in the first tank 16a is returned to the first tank 16a through a part of the second pipe 32, the third pipe 33, and a part of the first pipe 31. This flow is generated by a pump 39 and the cooling liquid 18 passes through the heat exchanger 20. This flow of the cooling liquid 18 will be referred to as "first tank 16a circulation flow".
On the other hand, with the fifth valve 38 closed, the first valve 34 and the third valve 36 closed, and the second valve 35 and the fourth valve 37 open, the cooling liquid 18 in the second tank 16b is returned to the second tank 16b through a part of the second pipe 32, the third pipe 33, and a part of the first pipe 31. This flow is generated by a pump 39 and the cooling liquid 18 passes through the heat exchanger 20. This flow of the cooling liquid 18 will be referred to as "second tank 16b circulation flow".
In this manner, the valve mechanism 22 is used to select a flow path connecting the heat exchanger 20 and the oil tanks 16a and 16 b. In other words, the valve mechanism 22 selects one (16a or 16b) of the two oil tanks 16a and 16b to connect to the heat exchanger 20. Specifically, the valve mechanism 22 has a first function of selecting one of the circulation flow of the first tank 16a and the circulation flow of the second tank 16 b. The configuration of the primary flow path portion 24 that obtains the circulation flow of the first tank 16a and the circulation flow of the second tank 16b may be different from that shown. The valve mechanism 22 has the following second function in addition to the above-described first function.
As shown in fig. 3, with the fifth valve 38 open, the first valve 34 and the fourth valve 37 open, and the second valve 35 and the third valve 36 closed, the cooling liquid 18 in the first tank 16a flows to the second tank 16b through the coupling flow path 30, and returns to the first tank 16a through a portion of the second pipe 32, the third pipe 33, and a portion of the first pipe 31. This flow is generated by a pump 39 and the cooling liquid 18 passes through the heat exchanger 20. This flow of cooling liquid 18 will be referred to as "first system flow".
On the other hand, as shown in fig. 4, with the fifth valve 38 open, the second valve 35 and the third valve 36 open, and the first valve 34 and the fourth valve 37 closed, the cooling liquid 18 in the second tank 16b flows to the first tank 16a through the coupling flow path 30, and returns to the second tank 16b through a portion of the second pipe 32, the third pipe 33, and a portion of the first pipe 31. This flow is generated by a pump 39 and the cooling liquid 18 passes through the heat exchanger 20. This flow of cooling liquid 18 will be referred to as "second system flow".
In this manner, the valve mechanism 22 is used to select a flow path connecting the heat exchanger 20 and the oil tanks 16a and 16 b. Specifically, the valve mechanism 22 has a second function of selecting one of the first system flow and the second system flow. The configuration of the primary flow path portion 24 that obtains the first system flow and the second system flow may be different from the illustrated configuration.
In fig. 2, 3 and 4, the power generating unit 14 is a binary power generating unit. The power generation unit 14 is connected to the heat exchanger 20 via a secondary flow path portion 26, and the heating medium 19 on the secondary side flows through the secondary flow path portion 26. The power generation unit 14 generates electric power using the heating medium 19 as an input. The power generation unit 14 generates electric power according to the temperature of the heating medium 19 on the secondary side. That is, the power generation unit 14 may generate electric power with the heating medium 19 at a predetermined temperature or higher, and may not generate electric power with the temperature of the heating medium 19 lower than the predetermined temperature. That is, the power generation unit 14 may generate electric power with the cooling liquid 18 for heat exchange with the heating medium 19 being at a prescribed temperature or higher, and may not generate electric power with the temperature of the cooling liquid 18 being lower than the prescribed temperature.
The first power generating operation will be described. That is, the power generation operation performed by the heat recovery system 10 configured as described above will be described. Fig. 5 is a graph showing a time change (change in temperature with time) of the temperature in each of the chambers such as the hardening chamber 87 (see fig. 1) for heat treatment in the first furnace 12a and the second furnace 12 b. The upper part of fig. 5 is a graph of the first furnace 12 a. The lower part of fig. 5 is a graph of the second furnace 12 b. In each of the first furnace 12a and the second furnace 12b, the object 7 is heated to a carburizing temperature of about 950 ℃ in the carburizing diffusion chamber 84, and thereafter, the object 7 at a hardening temperature of about 850 ℃ is immersed in the cooling liquid 18 in the oil tank 16 to be quenched (hardened) in the hardening chamber 87. As shown in fig. 5, the time (timing) at which quenching of the object 7 is started at the hardening temperature in the first furnace 12a is different from the time (timing) at which quenching of the object 7 is started at the hardening temperature in the second furnace 12 b. Fig. 5 shows a case where the start of quenching in the second furnace 12b is delayed by a time Δ t1 from the start of quenching in the first furnace 12 a. The heat treatment of the object 7 is repeated in each of the first furnace 12a and the second furnace 12b at a predetermined cycle time. For example, the cycle time may be constant or may vary depending on the weight of the object 7.
Fig. 6 shows the relationship between the temperature of the cooling liquid 18 in each of the first furnace 12a and the second furnace 12b and whether the power generation unit 14 is capable of generating electric power. As shown in fig. 6, since the start of quenching in the second furnace 12b is delayed by a time Δ t1 from the start of quenching in the first furnace 12a (time t0), the start time of the temperature increase of the cooling liquid 18 in the second oil tank 16b of the second furnace 12b is delayed by a time Δ t1 from the start time of the temperature increase of the cooling liquid 18 in the first oil tank 16a of the first furnace 12a (from the start time t 0). The time Δ t1 will be referred to as "delay time Δ t 1".
When the temperature of the cooling liquid 18 in the first oil tank 16a rises to the prescribed temperature a or higher after time t0, heat exchange (i.e., heat is transferred) from the cooling liquid 18 to the heating medium 19 on the secondary side is performed in the heat exchanger 20, which enables the power generation unit 14 to generate electric power. Thus, in fig. 2, the second valve 35, the fourth valve 37, and the fifth valve 38 are closed, and the first valve 34 and the third valve 36 are opened. That is, the flow of the cooling liquid 18 is "the first tank 16a circulates". In this case, in fig. 6, the temperature of the cooling liquid 18 in the first tank 16a rises to a certain value and then falls. The power generation unit 14 may generate electric power for a duration Δ t2 that continues until the temperature becomes lower than the prescribed temperature a. In the present embodiment, the delay time Δ t1 is set to be longer than the duration Δ t 2. The delay time Δ t1 may be equal to the duration Δ t2, or may be shorter than the duration Δ t 2.
In the case of fig. 6, during the time Δ t3, power generation is not possible, and the time Δ t3 is the difference between the delay time Δ t1 and the duration time Δ t 2. However, when the temperature of the cooling liquid 18 in the second tank 16b rises to the prescribed temperature a or higher after the delay time Δ t1 has elapsed from the start of the rise in temperature of the cooling liquid 18 in the first tank 16a (time t0), heat exchange (i.e., heat is transferred) from the cooling liquid 18 to the heating medium 19 on the secondary side is performed in the heat exchanger 20, which enables the power generation unit 14 to generate electric power. Therefore, the valve opening-closing operation of the valve mechanism 22 is performed in fig. 2, and the second valve 35 and the fourth valve 37 are opened (from the closed state), and the first valve 34 and the third valve 36 are closed (from the open state). The fifth valve 38 remains closed. That is, the flow of the cooling liquid 18 is switched to the "second tank 16b circulation flow".
In fig. 6, the temperature of the cooling liquid 18 in the second tank 16b rises to a certain value and then falls. The power generation unit 14 can generate electric power for a duration Δ t4, which lasts for a duration Δ t4 until the temperature becomes lower than the predetermined temperature a. During a time Δ t5 after the duration Δ t4, the temperature of the cooling liquid 18 in the second tank 16b is lower than the prescribed temperature a, and electric power cannot be generated. However, in the first furnace 12a, in the next cycle, that is, after the cycle time T has elapsed from the time T0, the other objects 7 are immersed in the first oil tank 16a, and the power generation unit 14 can generate electric power again by the waste heat from the first furnace 12 a. Thus, the valve opening-closing operation of the valve mechanism 22 is performed in fig. 2. The above operation is repeatedly performed thereafter.
In this way, in the first power generation operation performed by the heat recovery system 10, operation control of the first furnace 12a (first oil tank 16a) and the second furnace 12b (second oil tank 16b) is performed such that the timing at which the temperature of the cooling liquid 18 in the first oil tank 16a serving as one heat source portion is increased is different from the timing at which the temperature of the cooling liquid 18 in the second oil tank 16b serving as the other heat source portion is increased. The valve mechanism 22 operates according to the timing at which the temperature of the cooling liquid 18 in each of the two tanks 16a and 16b rises.
In the first power generating operation, the two fuel tanks 16a and 16b share the power generating unit 14. The respective timings at which the temperatures of the cooling liquid 18 in the tanks 16a and 16b increase are different from each other (in other words, the timing at which the temperature of the cooling liquid 18 in the first tank 16a is increased is different from the timing at which the temperature of the cooling liquid 18 in the second tank 16b is increased). Therefore, when the cooling liquid 18 whose temperature has been raised in the first oil tank 16a is supplied to the heat exchanger 20, heat exchange (i.e., heat is transferred) from the cooling liquid 18 to the heating medium 19 on the secondary side is performed, and the power generation unit 14 generates electric power using the heating medium 19 as an input. Thereafter, even if the temperature of the first oil tank 16a falls and power cannot be generated, the cooling liquid 18 whose temperature has been raised in the second oil tank 16b, which is an oil tank other than the first oil tank 16a, is supplied to the heat exchanger 20. Heat exchange (i.e., heat is transferred) from the cooling liquid 18 to the heating medium 19 on the secondary side is performed, and the power generation unit 14 can generate electric power using the heating medium 19 as an input. In this way, by making the timing at which the temperature of the cooling liquid 18 in the tank 16a increases different from the timing at which the temperature of the cooling liquid 18 in the tank 16b increases, the power generation unit 14 is given more operation opportunities. Specifically (see fig. 6), the cycle time T is set to 30 minutes, and the duration Δ T2(Δ T4) during which the power generation unit 14 can generate electric power is set to 10 minutes. In the example according to the related art represented in fig. 9, power generation is possible for one third (10 minutes) of each cycle time T, and power generation is impossible for the remaining two thirds (20 minutes). In contrast, in the first power generation operation shown in fig. 6, power can be generated for two thirds (20 minutes) of each cycle time T, and power cannot be generated for the remaining one third (10 minutes). Therefore, the power generation of the power generation unit 14 can be performed efficiently.
The second power generating operation will be described. The heat recovery system 10 configured as described above may perform a power generation operation different from the first power generation operation. The second power generating operation will be described below. As described above (see fig. 3), the primary flow path portion 24 includes the main flow path 28 and the coupling flow path 30, the main flow path 28 connecting each of the first and second tanks 16a and 16b to the heat exchanger 20, and the coupling flow path 30 connecting the first and second tanks 16a and 16b to each other so that the cooling liquid 18 can move between the first and second tanks 16a and 16 b.
As shown in fig. 3, when the object 7 that has been heated is immersed in the cooling liquid 18 in the first tank 16a, the opening-closing of the valves 34 to 38 is controlled so that the flow of the cooling liquid 18 should become the "first system flow" with the valve mechanism 22. Therefore, the temperature of the cooling liquid 18 in the first tank 16a is first raised. In this case, the cooling liquid 18 in the first oil tank 16a flows to the second oil tank 16b through the coupling flow path 30, and the cooling liquid 18 flows to the heat exchanger 20 through the second oil tank 16 b. Then, in the heat exchanger 20, heat exchange (i.e., heat transfer) to the heating medium 19 on the secondary side is performed. This enables the power generation unit 14 to generate electric power.
On the other hand, as shown in fig. 4, when the object 7 that has been heated is immersed in the cooling liquid 18 in the second tank 16b, the opening-closing of the valves 34 to 38 is controlled so that the flow of the cooling liquid 18 should become the "second system flow" with the valve mechanism 22. Therefore, the temperature of the cooling liquid 18 in the second oil tank 16b is first raised. In this case, the cooling liquid 18 in the second tank 16b flows to the first tank 16a through the coupling flow path 30, and the cooling liquid 18 flows to the heat exchanger 20 through the first tank 16 a. Then, in the heat exchanger 20, heat exchange (i.e., heat transfer) to the heating medium 19 on the secondary side is performed. This enables the power generation unit 14 to generate electric power.
In this way, in the second power generating operation shown in fig. 3 and 4, since the first tank 16a and the second tank 16b are connected to each other by the coupling flow path 30, the first tank 16a and the second tank 16b can be regarded as a single tank, and the volume of the cooling liquid 18 serving as the heat source increases. Therefore, the temperature increase of the cooling liquid 18 due to the heat obtained by the heat treatment of the object 7 is alleviated, as compared with the case of the first power generation operation (see fig. 6), but the temperature of the cooling liquid 18 that has been increased is not easily decreased. That is, the time (Δ t2 and Δ t4 in fig. 6) for which the temperature of the cooling liquid 18 is the prescribed temperature a or higher is extended. Therefore, the time (i.e., the period of time) during which the power generation unit 14 can generate electric power can be extended as compared with the related art.
The third power generating operation will be described. The heat recovery system 10 configured as described above can perform the power generation operation different from the first power generation operation and the second power generation operation. The third power generation operation will be described below. In the third power generating operation, as in the case of the first power generating operation, the timing at which the temperature of the cooling liquid 18 in the first tank 16a rises and the timing at which the temperature of the cooling liquid 18 in the second tank 16b rises are different from each other. Further, as in the case of the second power generating operation, the flow path in the primary flow path portion 24 is switched by the valve mechanism 22, so that the cooling liquid 18 in the first tank 16a flows to the second tank 16b through the coupling flow path 30, and the cooling liquid 18 flows to the heat exchanger 20 through the second tank 16b at the timing when the temperature of the cooling liquid 18 in the first tank 16a rises. On the other hand, the flow path in the primary flow path portion 24 is switched by the valve mechanism 22 so that the cooling liquid 18 in the second tank 16b flows to the first tank 16a through the coupling flow path 30, and the cooling liquid 18 flows to the heat exchanger 20 through the first tank 16a at the timing when the temperature of the cooling liquid 18 in the second tank 16b rises.
As in the second power generating operation, since the first tank 16a and the second tank 16b are connected to each other by the coupling flow path 30, the tanks 16a and 16b can be regarded as a single tank, and the volume of the cooling liquid 18 serving as a heat source is increased. Therefore, as shown in fig. 7, the temperature increase of the cooling liquid 18 due to the heat obtained by processing the object 7 is alleviated, but the temperature of the cooling liquid 18 that has been increased is not easily decreased. Therefore, the time during which the power generation unit 14 can generate electric power (the durations Δ t2 and Δ t4) can be extended. Further, as in the first power generating operation, the power generating unit 14 is given more operation opportunities by making the timing at which the temperature of the cooling liquid 18 in the tank 16a is increased different from the timing at which the temperature of the cooling liquid 18 in the tank 16b is increased. Fig. 7 shows the relationship between the temperature of the cooling liquid 18 in each of the first furnace 12a and the second furnace 12b and whether the power generation unit 14 can generate electric power in the case of the third power generation operation.
In the third power generation operation, the duration Δ t2 during which electric power can be generated by the waste heat from the first furnace 12a is extended. Therefore, the time Δ t3 during which electric power cannot be generated is shortened (eliminated) as compared with the case of the first power generation operation shown in fig. 6. The flow path in the primary flow path portion 24 is switched by the valve mechanism 22 so that electric power can be generated by the waste heat from the second furnace 12b before it becomes impossible to generate electric power by the waste heat from the first furnace 12 a. That is, the flow of the cooling liquid 18 is changed from the "first system flow" to the "second system flow" before (or when) it becomes impossible to generate electric power using waste heat from the first furnace 12 a. Then, after the duration Δ t2 in fig. 7, waste heat from the second furnace 12b may be used to generate electricity. Further, the duration Δ t4 during which electricity can be generated using waste heat from the second furnace 12b is extended. Therefore, the time Δ t5 during which electric power cannot be generated is shortened (eliminated) as compared with the case of the first power generation operation shown in fig. 6. The flow path in the primary flow path portion 24 is switched by the valve mechanism 22 so that electric power can be generated using the waste heat from the first furnace 12a before (or when) it becomes impossible to generate electric power using the waste heat from the second furnace 12 b. That is, the flow of the cooling liquid 18 is changed from the "second system flow" to the "first system flow" before (or when) it becomes impossible to generate electric power using the waste heat from the second furnace 12 b.
In the third power generation operation shown in fig. 7, electric power can be generated throughout the cycle time T. Therefore, the power generation of the power generation unit 14 can be performed efficiently.
The heat recovery system 10 according to the present embodiment will be described. In the heat treatment apparatus 12 that performs heat treatment on the object 7 in fig. 1, the state of heat treatment (i.e., the state regarding heat treatment) may be changing every moment. Therefore, the temperature of the waste heat obtained from the fuel tank 16a and the fuel tank 16b is unstable. However, with the second power generation operation and the third power generation operation performed by the heat recovery system 10 according to the present embodiment, the waste heat can be balanced (equalized) as much as possible, and the waste heat can be efficiently utilized to generate power.
With regard to the first power generation operation performed by the heat recovery system 10 according to the present embodiment (see fig. 6), the start of temperature increase of the cooling liquid 18 in the second tank 16b is delayed from the start of temperature increase of the cooling liquid 18 in the first tank 16a (time t0) by a time Δ t1, which is defined as "delay time Δ t 1". As described above, the temperature of the waste heat obtained from the fuel tanks 16a and 16b is unstable. Therefore, the delay time Δ t1 may vary depending on the temperature of the waste heat (the temperature of the cooling liquid 18) rather than being constant. That is, the timing when the flow of the cooling liquid 18 is switched by the valve mechanism 22 between "the first tank 16a circulates the flow" and "the second tank 16b circulates the flow" may be changed according to the temperatures of the cooling liquid 18 in the first tank 16a and the second tank 16 b.
In the above embodiment, two heat treatment apparatuses 12 share one power generation unit 14. However, three or more heat treatment apparatuses 12 may be provided instead of providing two heat treatment apparatuses 12 as long as a plurality of heat treatment apparatuses 12 are provided.
The heat treatment apparatus 12 is not limited to a continuous carburizing and hardening (quenching) furnace such as that shown in fig. 1, and may be, for example, a batch carburizing and hardening furnace. The combination of the plurality of heat treatment apparatuses 12 may be a combination of a continuous carburizing and hardening furnace and a batch carburizing and hardening furnace. Although the carburization hardening furnace is described above as an example, the present invention is not limited thereto. The cooling liquid may be oil, water, polymer, etc. Instead of a cooling liquid, a cooling gas may be used. The target facility is not limited to the carburization hardening furnace, and may be a heat treatment furnace having a hardening bath, such as a hardening furnace (quenching furnace), a carbonitriding hardening furnace, a vacuum carburization hardening furnace, and a vacuum hardening furnace. In the embodiment of fig. 1, waste heat from the oil tank 16 of the hardening chamber 87 is used for power generation. However, heat from the exhaust gas of the regenerative burner in the preheating chamber 82(83) or heat from the cooling pipe in the temperature decrease chamber 85 may be used as the heat source. In this case, the preheating chamber 82(83) (or the temperature reducing chamber 85) serves as a heat source portion, and a part of the preheating chamber 82(83) (or the temperature reducing chamber 85) of the first furnace 12a and a part of the preheating chamber 82(83) (or the temperature reducing chamber 85) of the second furnace 12b are connected to each other by the coupling flow path 30 or the like.
In the above embodiment, the power generation unit 14 is combined with the heat treatment apparatus 12. However, the power generation unit 14 may be integrated with facilities other than the heat treatment apparatus 12. In the case where electric power is generated by waste heat obtained from a factory or a facility such as the heat treatment apparatus 12, the waste heat may be in a high temperature range or a low temperature range. However, with the configuration of the above embodiment, waste heat can be stably recovered to achieve efficient power generation.
The disclosed embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the invention is not limited to the embodiments discussed above and includes all variations falling within the scope of the invention.
Fig. 10 is a schematic diagram showing an example of a heat recovery system according to the second embodiment. An overview of the heat recovery system 10 according to the present embodiment will be described. In the heat recovery system 10, the power generation unit (binary power generation unit) 14 generates electric power using waste heat from the heat treatment apparatus 12 that performs heat treatment of metal parts. Examples of metal components include mechanical components such as bearing rings, shafts and pins of rolling bearings. The heat treatment may be a hardening treatment (i.e., quenching treatment). For the heat treatment, the metal member 7 (hereinafter referred to as "object 7") that has been heated is immersed in a cooling liquid (hardened oil, i.e., quenching oil) 18 in an oil tank 16 of the heat treatment apparatus 12 to be cooled. In the present embodiment, a plurality of objects 7 are accommodated in a basket 8, and the basket 8 is moved up and down by an actuator 9. When the basket 8 is lowered, the object 7 is immersed in the cooling liquid 18 to be cooled.
When the object 7, which has been heated, is immersed in the cooling liquid 18, the temperature of the cooling liquid 18 increases. The heat of the cooling liquid 18 is used by the power generation unit 14 to generate power. That is, the oil tank 16 serves as a heat source, and the cooling liquid 18 serves as a heating medium (first fluid) on the primary side. The heat of the cooling liquid 18 is transferred to the heating medium (second fluid) 19 on the secondary side through the heat exchanger 20 of the power generation unit 14, and the power generation device 122 generates electric power.
A specific configuration of the heat recovery system 10 will be described. The heat recovery system 10 shown in fig. 10 is provided by applying a power generation cell (binary power generation cell) 14 to a heat treatment apparatus 12 that performs a heat treatment (hardening treatment, i.e., quenching treatment) on an object 7.
The heat treatment apparatus 12 includes a first purge chamber 81, a first preheating chamber 82, a second preheating chamber 83, a carburizing diffusion chamber 84, a temperature decrease chamber 85, a soaking chamber 86, a hardening chamber (quenching chamber) 87, and a second purge chamber 88, which are arranged in this order from the upstream side (left side in fig. 10) in the advancing direction of the object 7. The hardening chamber 87 is provided with an oil tank 16.
The power generation unit 14 includes a primary-side flow path 131, a heat exchanger (evaporator) 20, a secondary-side flow path 132, a power generation device 122, and a condenser 124.
The cooling liquid 18 flows from the oil tank 16 serving as a heat source to the primary-side flow path 131. Specifically, the primary-side flow path 131 includes a first pipe 140 and a second pipe 142. The first pipe 140 connects the oil tank 16 serving as a heat source and the heat exchanger 20. The cooling liquid 18 flows from the oil tank 16 to the heat exchanger 20 through the first pipe 140. The second pipe 142 connects the heat exchanger 20 and the oil tank 16. The cooling liquid 18 flows from the heat exchanger 20 to the oil tank 16 through the second pipe 142. As will be described later, the first pipe 140 comprises a multi-walled pipe 50, the multi-walled pipe 50 comprising a plurality of independent flow paths extending in a longitudinal direction. The multi-walled tube 50 may be part of a first tube 140. However, in the present embodiment, all the first pipes 140 are formed of the multi-walled pipe 50. In this way, the primary-side flow path 131 includes the multiple-walled tube 50.
The heat exchanger 20 performs heat exchange (i.e., transfers heat) from the cooling liquid 18 flowing through the primary-side flow path 131 (first pipe 140) to the heating medium 19 on the secondary side. For example, the temperature of the cooling liquid 18 flowing through the first tube 140 is about 120 ℃ to 130 ℃. The heating medium 19 on the secondary side has a relatively low boiling point. The heating medium 19 on the secondary side can employ various fluids. Examples of such fluids include chlorofluorocarbon replacements (HFC245 fa). In the heat exchanger 20, the heat of the cooling liquid 18 is transferred to the heating medium 19 on the secondary side to vaporize the heating medium 19. When the heating medium 19 deprives the cooling liquid 18 of heat, the cooling liquid 18 is cooled and returned to the oil tank 16.
The heating medium 19 that has been vaporized in the heat exchanger 20 flows through the secondary-side flow path 132. The secondary-side flow path 132 is formed by an annular pipe. The heat exchanger 20, the power generation device 122, the condenser 124, and the like are disposed at various positions in the secondary-side flow path 132.
The power generation device 122 includes an expansion unit (scroll expansion unit) 126. The heating medium 19 input from the heat exchanger 20 on the secondary side of the expansion unit 126 is used to generate electric power. The heating medium 19 having passed through the power generation device 122 (expansion unit 126) is input to the condenser 124. The heating medium 19 that has passed through the power generation device 122 is about 30 to 40 ℃ hotter than normal temperature (i.e., normal temperature) and is still in a gaseous state. When the heating medium 19 is cooled in the condenser 124, the heating medium 19 is liquefied. The heating medium 19 that has been liquefied flows to the heat exchanger 20, and heat exchange is performed between the heating medium 19 and the cooling liquid 18.
As described above, the heating medium 19 on the secondary side is cooled and liquefied in the condenser 124. The heating medium 19 is cooled to, for example, about a normal temperature. The condenser 124 according to the present embodiment air-cools the heating medium 19 using a fan (in other words, in the condenser 124, the heating medium 19 is air-cooled by the fan). One end 45 of the connection pipe 44 is connected to the condenser 124. The heat of the heating medium 19 is transferred to the ambient air in the condenser 124. The ambient air becomes heated air (hot air) and is taken into the connection pipe 44 to flow toward the other end 46 of the connection pipe 44. The temperature of the heated air obtained using the heat output from the condenser 124 is higher than the ambient temperature (outside air: normal temperature) around the primary-side flow path 131. The other end 46 of the connection pipe 44 is connected to an outer flow path portion 136 (see fig. 11 and 12) of the multi-wall pipe 50 of the primary-side flow path 131 (to be discussed later).
The multi-walled pipe 50 will be described. Fig. 11 is a cross-sectional view showing an example (overview) of the multi-walled pipe 50. Fig. 12 is a longitudinal sectional view showing an example (overview) of a multi-walled pipe. The multi-wall pipe 50 includes a main pipe 52 and a sub pipe 56, the main pipe 52 having an outer periphery at which a heat insulating material 54 is provided, the sub pipe 56 being provided around the outer periphery of the main pipe 52. Each of the primary pipe 52 and the secondary pipe 56 is formed of a pipe made of, for example, metal. The insulating material 54 covers the entire circumference (i.e., the entire circumference) of the main pipe 52. A flow path having an annular cross section is provided between the outer circumferential surface of the heat insulating material 54 and the sub pipe 56. In the present embodiment, the second heat insulating material 58 is provided at the outer periphery of the sub pipe 56. The heat insulating materials 54 and 58 are made of glass wool, for example.
The interior of the main pipe 52 serves as the inner flow path portion 134 through which the cooling liquid 18 flows. As shown in fig. 12, the connection pipe 44 provided to extend from the condenser 124 is connected to the outer flow path portion 136. A flow path having an annular cross section on the inner peripheral side of the sub-pipe 56 serves as the outer flow path portion 136. The heated air that has passed through the connection pipe 44 flows through the outer flow path portion 136. The discharge pipe 48 is connected to a multi-walled pipe 50. The exhaust duct 48 is connected to the outer flow path portion 136, and the heated air is discharged from the exhaust duct 48.
A first valve 61 is provided at the other end 46 of the connecting tube 44. When the first valve 61 is open, the heated air is allowed to flow from the connection pipe 44 into the outer flow path portion 136, and when the first valve 61 is closed, the heated air is prevented from flowing from the connection pipe 44 into the outer flow path portion 136. A second valve 62 is provided in the discharge pipe 48. When the second valve 62 is open, the heated air is allowed to flow out from the outer flow path portion 136 to the outside, and when the second valve 62 is closed, the heated air is prevented from flowing out from the outer flow path portion 136 to the outside.
As described above, the multi-walled pipe 50 includes the inner flow path portion 134 through which the cooling liquid 18 passes and the outer flow path portion 136 provided around the inner flow path portion 134. The heated air obtained using the heat output from the condenser 124 and having flowed through the connection pipe 44 passes through the outer flow path portion 136.
Fig. 13 is a cross-sectional view showing a modification of the multiple-walled pipe 50. The multi-walled pipe 50 shown in fig. 13 includes a main pipe 52 having an outer periphery, a sub pipe 56 disposed around the outer periphery of the main pipe 52, and an outer pipe 60 disposed around the outer periphery of the sub pipe 56, wherein a heat insulating material 54 is disposed at the outer periphery of the main pipe 52. In the form shown in fig. 11, the interior of the main pipe 52 serves as the inner flow path portion 134. The sub-pipe 56 is disposed away from the heat insulating material 54 in the radial direction to form a flow path having an annular cross section, which serves as the outer flow path portion 136 (in other words, the sub-pipe 56 is disposed away from the heat insulating material 54 in the radial direction to provide a flow path having an annular cross section, which serves as the outer flow path portion 136). A second heat insulating material 58 is provided at the outer periphery of the sub-pipe 56. The outer pipe 60 is disposed away from the second insulating material 58 in the radial direction, and a sealed space having an annular cross section is formed between the outer pipe 60 and the insulating material 58. The sealed space serves as a vacuum space 59.
Fig. 14 shows a schematic configuration of the condenser 124, the connection pipe 44, the primary-side flow path 131, and surrounding components. In the present embodiment, as described above, the first pipe 140 of the primary-side flow path 131 includes the multiple-walled pipe 50. The condenser 124 and the outer flow path portion 136 (see fig. 11 and 12) of the multiple-wall tube 50 are connected to each other by a connection tube 44. The heated air supplied from the condenser 124 flows through the connection pipe 44 to be supplied to the outer flow path portion 136.
The connection pipe 44 shown in fig. 14 includes a main connection pipe 64 connected to the condenser 124 and branch pipes 65 and 66 branched from the main connection pipe 64. The branch pipe 65 is connected to the downstream side (heat exchanger 20 side) of the multiple wall pipe 50. The branch pipe 66 is connected to the upstream side (the tank 16 side) of the multiple-wall pipe 50. The discharge pipe 48 is connected to a middle portion of the middle area of the multiple-walled pipe 50. With this configuration, the heated air that has flowed out of the condenser 124 through the main connection pipe 64 passes through each of the branch pipes 65 and 66 to flow into the outer flow path portion 136 of the multi-wall pipe 50. The heated air that has flowed into the outer flow path portion 136 flows in the longitudinal direction of the multi-wall pipe 50, and is discharged from the discharge pipe 48.
The connecting tube 44 may be configured differently than shown in fig. 14. For example, the connection pipe 44 may be directly connected to the upstream side (the tank 16 side) of the multiple-wall pipe 50 without being branched as shown in fig. 14. In this case, the discharge pipe 48 is connected to the downstream side (heat exchanger 20 side) of the multiple-wall pipe 50. Alternatively, the connection pipe 44 may be directly connected to the downstream side (heat exchanger 20 side) of the multi-wall pipe 50 without being branched. In this case, the discharge pipe 48 is connected to the upstream side (the tank 16 side) of the multiple-wall pipe 50.
As described above, the heat recovery system 10 (see fig. 10) according to the present embodiment includes: a primary-side flow path 131 through which the cooling liquid 18 flows from the oil tank 16 serving as a heat source; a heat exchanger 20; a secondary-side flow path 132 through which the heating medium 19 on the secondary side flows; a power plant 122 and a condenser 124. The heat exchanger 20 performs heat exchange (i.e., transfers heat) from the cooling liquid 18 flowing through the primary-side flow path 131 to the heating medium 19 on the secondary side. The power generation device 122 generates electric power using the heating medium 19 in the secondary-side flow path 132. The heating medium 19 having passed through the power generation device 122 (expansion unit 126) is input to the condenser 124, so that heat exchange is performed between the heating medium 19 and the ambient air. The primary-side flow path 131 includes the multiple-walled tube 50. As shown in fig. 11 and 12 (fig. 13), the multiple-walled tube 50 includes an inner flow path portion 134 through which the cooling liquid 18 passes and an outer flow path portion 136 provided around the inner flow path portion 134. The heated air obtained using the heat output from the condenser 124 passes through the outer flow path portion 136.
With the heat recovery system 10, it is possible to reuse the energy discarded as waste heat in the related art, i.e., the thermal energy output from the condenser 124. That is, by supplying heated air obtained using heat output from the condenser 124 to the outer flow path portion 136 of the multiple-wall tube 50, it is possible to suppress a temperature drop due to heat release from the cooling liquid 18 flowing through the inner flow path portion 134 of the multiple-wall tube 50. Heat exchange can be performed with high thermal efficiency (i.e., heat can be transferred) from the cooling liquid 18 to the heating medium 19 on the secondary side. As a result, the efficiency of power generation (binary power generation) in which the heating medium 19 is used can be improved.
In the present embodiment, as shown in fig. 14, the primary-side flow path 131 includes a first pipe 140 and a second pipe 142, the first pipe 140 allowing the cooling liquid 18 to flow from the tank 16 to the heat exchanger 20, and the second pipe 142 allowing the cooling liquid 18 to flow from the heat exchanger 20 to the tank 16. The first tube 140 comprises a multi-walled tube 50. The condenser 124 and the outer flow path portion 136 of the multiple-wall tube 50 are connected to each other by a connection tube 44. The effect of retaining the heat of the cooling liquid 18 flowing through the inner flow path portion 134 can be enhanced by the heated air supplied to the outer flow path portion 136 via the connecting pipe 44. Therefore, it is possible to effectively suppress a temperature drop of the cooling liquid 18 flowing to the heat exchanger 20 through the first pipe 140.
As shown in fig. 11 and 12, the multiple wall pipe 50 according to the present embodiment includes a main pipe 52 and a sub pipe 56, the main pipe 52 having an outer periphery at which a heat insulating material 54 is provided, the sub pipe 56 being provided around an outer peripheral side of the main pipe 52, and a flow path having an annular cross section being formed in the sub pipe 56 to serve as an outer flow path portion 136. That is, the multiple-walled pipe 50 has a double-walled configuration (double-pipe structure) in which an outer flow path portion 136 (sub-pipe 56) through which heated air flows is provided around the outer peripheral side of an inner flow path portion 134 (main pipe 52) through which the cooling liquid 18 flows.
In a variant, as shown in fig. 13, the multiple-walled tube 50 may have a triple-walled construction (triple-tube structure). That is, the multi-walled pipe 50 includes a main pipe 52, a sub pipe 56, and an outer pipe 60 arranged in this order from the center. The heat insulating material 54 is provided at the outer periphery of the main pipe 52. The interior of the main pipe 52 serves as the inner flow path portion 134. The sub pipe 56 is disposed around the outer peripheral side of the main pipe 52, and a flow path having an annular cross section serving as the outer flow path portion 136 is formed between the main pipe 52 and the sub pipe 56. The outer tube 60 is disposed around the outer peripheral side of the sub-tube 56, and forms a vacuum space 59 having an annular cross section. In this modification, the outer flow path portion 136 (the sub-pipe 56) through which the heated air flows is provided around the outer peripheral side of the inner flow path portion 134 (the main pipe 52) through which the cooling liquid 18 flows, and further, the vacuum space 59 is provided at the outer periphery of the outer flow path portion 136. Therefore, the function of suppressing the temperature decrease of the cooling liquid 18 can be further enhanced.
As shown in fig. 14, the condenser 124 cools and condenses the heating medium 19 on the secondary side. In the present embodiment, the condenser 124 uses a fan to air-cool the heating medium 19. Thus, the fan condenses the heating medium 19 and generates heated air having a flow velocity. Therefore, the heated air is immediately supplied to the primary-side flow path 131 (the multiple-walled tube 50 of the first tube 140) through the connection tube 44.
As shown in fig. 14, the heat recovery system 10 according to the present embodiment further includes a connection pipe 44, a first valve 61, a discharge pipe 48, and a second valve 62. The connecting pipe 44 connects the condenser 124 and the outer flow path portion 136 of the multi-wall pipe 50, and the heated air from the condenser 124 flows through the connecting pipe 44. The first valve 61 has a function of allowing and preventing the flow of the heated air from the connection pipe 44 into the outer flow path portion 136 by an opening-closing operation. The exhaust duct 48 is connected to the outer flow path portion 136 to exhaust the heated air. The second valve 62 has a function of allowing and preventing the heated air from flowing out from the outer flow path portion 136 to the discharge pipe 48 by an opening-closing operation. With this configuration, heated air resides in the outer flow path portion 136 when the second valve 62 is closed to prevent the heated air from flowing out of the exhaust pipe 48. Therefore, the temperature of the outer flow path portion 136 can be raised for a predetermined time. When the second valve 62 is closed, the first valve 61 may also be closed. When the predetermined time elapses, the temperature of the outer flow path portion 136 starts to decrease. Accordingly, the second valve 62 (and the first valve 61) is opened to introduce new heated air to the outer flow path portion 136. Such opening-closing operations of the valves 61 and 62 may be repeatedly performed.
In the above-described embodiment, the ambient air is heated using the waste heat obtained from the condenser 124 of the power generation unit 14, and thus the heated air is obtained. That is, the condenser 124 is a generation source of the heated air. The generation source of the heated air may be different from the condenser 124 described above. That is, heated air may be obtained from waste heat generated by different constituent elements. The waste heat output portion (generation source) that outputs waste heat to generate heated air may be the oil tank 16 (see fig. 10) of the heat treatment apparatus 12, or may be the carburizing diffusion chamber 84 that generates hot gas, in addition to or instead of the condenser 124. The waste heat output unit may be a component (a fuel tank or a carburizing and diffusing chamber) of another heat treatment apparatus provided in the vicinity of the heat treatment apparatus 12 to which the power generation unit 14 is applied, for example. In this way, the waste heat output that outputs heat to obtain heated air may be at least one of the heat source (the oil tank 16), another heat source, and the condenser 124.
The disclosed embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the invention is not limited to the embodiments discussed above and includes all variations falling within the scope of the invention.
The form of the heat treatment apparatus 12 may be different from that shown in fig. 10, and may be a batch treatment furnace rather than a continuous treatment furnace. The heat source for performing the binary generation may be different from the oil tank 16. The device including the heat source may be different from the heat treatment device 12. For example, the heat recovery system 10 may be employed for geothermal power generation plants.

Claims (11)

1. A heat recovery system, characterized by comprising:
a plurality of heat source portions configured to increase a temperature of the first fluid using heat obtained by processing the object;
a heat exchanger connected to the plurality of heat source portions via a primary flow path portion (24), the first fluid flowing through the primary flow path portion (24), and the heat exchanger being configured to perform heat exchange between the first fluid and a second fluid;
a valve mechanism (22), the valve mechanism (22) being provided in the primary flow path portion (24), and the valve mechanism (22) being configured to select a flow path connecting the heat exchanger and the plurality of heat source portions; and
a power generation unit (14), the power generation unit (14) being connected to the heat exchanger via a secondary flow path portion (26), the second fluid flowing through the secondary flow path portion (26), and the power generation unit (14) being configured to generate electricity using the second fluid as an input, wherein
The timing at which the temperature of the first fluid in one of the plurality of heat source portions increases is different from the timing at which the temperature of the first fluid in another one of the plurality of heat source portions increases, and the valve mechanism (22) operates in accordance with the timing at which the temperature of the first fluid in each of the plurality of heat source portions increases.
2. The heat recovery system of claim 1, wherein:
the primary flow path portion (24) includes a main flow path (28) and a coupling flow path (30), the main flow path (28) connecting the plurality of heat source portions and the heat exchanger, the coupling flow path (30) connecting the plurality of heat source portions to each other so that the first fluid is movable between the plurality of heat source portions; and is
The valve mechanism (22) includes a valve configured to switch the flow path such that, in a case where the temperature of the first fluid in the one heat source portion increases, the first fluid flows to the other heat source portion through the coupling flow path (30) and the first fluid flows to the heat exchanger through the other heat source portion.
3. The heat recovery system according to claim 1 or 2, characterized in that the power generating unit (14) is a binary power generating unit.
4. A heat recovery system, characterized by comprising:
a plurality of heat source portions configured to increase a temperature of the first fluid using heat obtained by processing the object;
a heat exchanger connected to the plurality of heat source portions via a primary flow path portion (24), the first fluid flowing through the primary flow path portion (24), and the heat exchanger being configured to perform heat exchange between the first fluid and a second fluid;
a valve mechanism (22), the valve mechanism (22) being provided in the primary flow path portion (24), and the valve mechanism (22) being configured to select a flow path connecting the heat exchanger and the plurality of heat source portions; and
a power generation unit (14), the power generation unit (14) being connected to the heat exchanger via a secondary flow path portion (26), the second fluid flowing through the secondary flow path portion (26), and the power generation unit (14) being configured to generate electrical power using the second fluid as an input, wherein:
the primary flow path portion (24) includes a main flow path (28) and a coupling flow path (30), the main flow path (28) connecting the plurality of heat source portions and the heat exchanger, the coupling flow path (30) connecting the plurality of heat source portions to each other so that the first fluid is movable between the plurality of heat source portions; and is
The valve mechanism (22) includes a valve configured to switch the flow path such that, in a case where the temperature of the first fluid in one of the plurality of heat source portions increases, the first fluid flows to another one of the plurality of heat source portions through the coupling flow path (30) and the first fluid flows to the heat exchanger through the another one of the heat source portions.
5. The heat recovery system according to claim 4, characterized in that the power generating unit (14) is a binary power generating unit.
6. A heat recovery system, characterized by comprising:
a primary-side flow path (131) through which a first fluid flows from a heat source;
a heat exchanger configured to perform heat exchange between the first fluid and a second fluid flowing through the primary-side flow path (131);
a secondary-side flow path (132) through which the second fluid flows (132);
a power generation device configured to generate electric power using the second fluid in the secondary-side flow path (132); and
a condenser configured to cool and condense the second fluid that has passed through the power generation device, wherein:
the primary-side flow path (131) comprises a multi-walled tube (50), the multi-walled tube (50) comprising an inner flow path portion (134) and an outer flow path portion (136) disposed about the inner flow path portion (134), the first fluid passing through the inner flow path portion (134); and is
The outer flow path portion (136) is supplied with heated air obtained by heat output from a waste heat output portion that is at least one of the heat source, another heat source, and the condenser.
7. The heat recovery system of claim 6, wherein:
the primary-side flow path (131) includes a first pipe (140), the first pipe (140) allowing the first fluid to flow from the heat source to the heat exchanger;
the first tube (140) comprises the multi-walled tube (50); and is
The heat recovery system includes a connection pipe (44) through which the heated air is supplied from the waste heat output to the outer flow path portion (136) of the multi-walled pipe (50).
8. The heat recovery system of claim 6, wherein:
the multi-walled pipe (50) comprising a primary pipe (52) and a secondary pipe (56);
a heat insulating material is provided at an outer periphery of the main pipe (52), and an inside of the main pipe (52) serves as the inner flow path portion (134); and is
The sub pipe (56) is disposed around an outer peripheral side of the main pipe (52), thereby configuring a flow path having an annular cross section that serves as the outer flow path portion (136).
9. The heat recovery system of claim 6, wherein:
the waste heat output is the condenser that cools and condenses the second fluid; and is
The second fluid is air cooled by a fan.
10. The heat recovery system of claim 6, further comprising:
a connection tube (44), the connection tube (44) connecting the waste heat output and the outer flow path portion (136) of the multi-walled tube (50), the connection tube configured to supply the heated air from the waste heat output;
a first valve configured to allow and prevent the heated air from flowing from the connecting tube into the outer flow path portion (136);
a discharge pipe (48), the discharge pipe (48) being connected to the outer flow path portion (136) to discharge the heated air; and
a second valve configured to allow and prevent the heated air from flowing out of the outer flow path portion (136) to the drain tube (48).
11. The heat recovery system of any one of claims 6 to 10, wherein:
the multi-walled pipe (50) comprises a main pipe (52), a secondary pipe (56) and an outer pipe (60);
a heat insulating material is provided at an outer periphery of the main pipe (52), and an inside of the main pipe (52) serves as the inner flow path portion (134);
the sub pipe (56) is disposed around an outer peripheral side of the main pipe (52), thereby providing a flow path having an annular cross section that serves as the outer flow path portion (136); and is
The outer tube (60) is disposed around an outer peripheral side of the sub-tube (56), thereby configuring a vacuum space having an annular cross section.
CN201910987576.4A 2018-10-22 2019-10-17 Heat recovery system Pending CN111076599A (en)

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JPS6137893A (en) * 1984-07-31 1986-02-22 Nippon Steel Chem Co Ltd Method and apparatus for dry quenching
JP2011226713A (en) * 2010-04-20 2011-11-10 Jp Steel Plantech Co Waste heat recovery facility and method for arc furnace for steel making, and arc furnace facility for steel making
US20120320941A1 (en) * 2010-04-20 2012-12-20 Jp Steel Plantech Co Waste heat recovery structure for steel making electric arc furnaces, steel making electric arc furnace facility, and waste heat recovery method for steel making electric arc furnaces
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