JPS60147095A - Heat energy recovering method - Google Patents

Abstract

PURPOSE:To take out stable power continuously by a method wherein heat storage medium in the slurry condition is heated using the heat energy exhausted intermittently or fluctuatelly, and said medium is storaged in a heat storage medium storage well and a turbine is revoluted by the working medium vaporized in this well. CONSTITUTION:The heat storage medium in the slurry condition, in which the powder of transition material (pentaerthritol) which absorb or release the transition heat corresponding to heating and cooling, being suspended in a suspending medium (Fron 113), is storaged in a heat storage medium well 21. Exhaust gas generated intermittently or fluctuately is supplied to a heat exchanger 22, and is heated in a heat exchanger 22, and is heated in a heated in a heat exchanger with the heat storaged medium in the slurry condition which was sent by a pump 23, and is returned to a heat medium storage well 21 through a reducing valve 24. A generator 26 is direct-coupled to a fron turbine 25 in which working medium evaporated in the storage well 21 is introduced. Working medium liquefied in a condenser 27 in which low pressure working medium out of the turbine 25 is cooled and liquified, is storaged in a storage 28, and is returned to the storage well 21 being pressurized to the pressure of in the storage well 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for recovering intermittent or fluctuating thermal energy as continuous and stable power.

Conventional configuration and its problems Conventionally, waste heat such as waste gas sensible heat and solid sensible heat emitted from intermittently operated furnaces, etc., is stored in a sensible heat storage device using bricks, stones, etc. , used for heating air etc.
Alternatively, it was cooled with cooling water or air, and was often discharged without being used as hot waste water, steam, or hot air.

The reason why such intermittently discharged waste heat has not been utilized much is that the time at which the heat is discharged differs from the time at which it is needed, so a heat storage device is required. This is because heat storage devices have the disadvantage that their capacity and weight increase, and at the same time, their temperature decreases in proportion to the heat released. However, when using solar energy,
Since that energy is often only available intermittently, a heat storage device is essential.

For this reason, latent heat storage devices that utilize the latent heat absorbed or released when substances melt or transform have been developed in recent years, but these devices also have the following drawbacks.

1. In a latent heat storage device that utilizes the latent heat of fusion of an inorganic substance such as an alkali or alkaline earth metal hydroxide, clathrate expanded hydrate, or chloride, when the waste gas or liquid heat medium is brought into direct contact with the heat storage material, There is a risk that the heat storage material may react with the waste gas or liquid heat medium and change its quality, and when using a heat storage material that utilizes latent heat of fusion, it is difficult for the heat storage material to maintain a certain shape when melted. Therefore, the heat storage substance must be enclosed in a capsule made of a material that does not react with either substance, and heat exchange must be carried out through the capsule.

2. In a latent heat storage device that utilizes the latent heat of fusion of polyolefin that has been surface-treated by a known method such as crosslinking treatment, direct contact between the polyolefin and the liquid heat medium is possible;
When brought into direct contact with waste gas or water, the oxygen contained in the waste gas or water reacts with the polyolefin, resulting in deterioration.

8. Even when using a latent heat storage material sealed in a capsule, direct heat exchange with waste gas has a small heat transfer coefficient and takes time to exchange heat, so heat exchange must be performed via a liquid heat medium. .

Furthermore, it is easiest to recover waste heat as high-temperature water or low-pressure steam, but in iron and steel factories, cement factories, ceramic factories, etc. that emit a large amount of waste heat, high-temperature water or low-pressure steam is recovered within the factory. Since there is little use for it, it must be recovered as electricity.

For this reason, if we consider a device that most efficiently recovers thermal energy that is generated intermittently or fluctuatingly in the conventional technology as continuous and stable electric power, it will be as shown in FIG. 1.

In Figure 1, heat exchanger (1) is heated to 200°C to 400°C.
Due to the fluctuating flow rate of waste gas on the order of
Recall, heat medium made of silicone oil, heat transfer oil, etc. 14
Heat to 0-150'C. The heat medium heated to 140 to 150° C. is passed through the latent heat storage device (2) from top to bottom under the pressure of the heat medium pump 0. At this time, the heat medium pump fIQ adjusts the heat medium flow meter so that the outlet temperature of the heat exchanger (1) is constant. Inside the latent heat storage device (2), a large number of polyethylene rods cross-linked only on the surface are installed as heat storage materials, and only the inside of the polyethylene rods is heated from above by direct contact with a heat medium of 140 to 150°C. It sequentially melts and stores heat. However, the surface of the polyethylene rod is cross-linked as described above, so it does not melt.
It keeps its shape.

On the other hand, if a part of the heated heat medium or the heated heat medium does not come from the heat exchanger (1), the pressure of the heat medium circulation bomb (9) is used to enter the latent heat storage device (2). Direct contact heat exchanger (3) where the heating medium is passed from bottom to top and comes into contact with a polyethylene rod whose inside is molten, and is heated to a nearly constant temperature of about 125°C by the latent heat released when the polyethylene solidifies. heats the working medium, Freon,
As high-pressure fluorocarbon vapor, it is guided to a fluorocarbon turbine (4), and at the same time as the fluorocarbon turbine (4) is turned, a directly connected generator (6) is turned to generate electric power. Front turbine (
4) The low-pressure freon vapor that exits condenses E! It is liquefied by cooling water at i+ (6), pressurized by a freon pump (7), preheated through a freon preheater (8), and then returned to the direct contact heat exchanger (3).

On the other hand, the heat medium that has transferred heat to the fluorocarbons is preheated by the fluorocarbon preheater (8), then pressurized by the heat medium circulation pump (9), and returned to the latent heat storage device (2).

At this time, the relationship between heat transfer and temperature within the direct contact heat exchanger (3) is as shown by lines (a) and (b) in FIG. That is, as shown in line (a), the liquefied fluorocarbon is preheated through the fluorocarbon preheater (8) and then supplied into the direct contact heat exchange @ (3), where the temperature is rapidly raised from the supply temperature To. , the temperature reaches the boiling temperature To at the pressure inside the direct contact heat exchanger (3), and at this temperature it gradually vaporizes, and at a constant temperature it becomes a fluorocarbon gas and is sent to the fluorocarbon turbine (4). On the other hand, the heat medium is a direct contact heat exchanger (3) as shown in line (b).
By giving sensible heat to the Freon inside itself, it changes from TA to T.
The temperature drops to B and is sent to the freon preheater. Here, the temperature difference △T between the fluorocarbon and the heating medium at the point PO where the fluorocarbon starts to boil
When using a direct contact heat exchanger, o can be made smaller than when using an indirect contact heat exchanger using heat transfer tubes, but it cannot be reduced to zero. Further, in the direct contact heat exchanger, the heat medium flowing in at the temperature TA mixes with the heat medium inside the direct contact heat exchanger, so the temperature of all the heat medium in the direct contact heat exchanger becomes a value close to Tn.

When the temperature difference between the inlet temperature TA and outlet temperature TB of the heat medium to the direct contact heat exchanger (3) is reduced, the amount of sensible heat of the heat medium that can be used becomes smaller, and the required circulation amount of the heat medium becomes large. , the power required for the heat medium circulation pump (9) increases, energy loss and equipment costs increase, so there is a limit to reducing this temperature difference, and the slope of the line (b) exceeds a certain value. There must be. Therefore, in the device according to the prior art, the inlet temperature TA of the heat medium to the direct contact heat exchanger (3) and the temperature T of the fluorocarbon vapor generated from the direct contact heat exchanger (3).

A considerable temperature difference is required between the heat storage temperature and the temperature of the generated steam from the direct contact heat exchanger, i.e. a considerable temperature level drop, i.e. a considerable energy quality (exergy loss). The disadvantage was that there was a decrease in

In the case of the device shown in Figure 1, the heat of the waste gas (waste heat source) is stored in the latent heat storage material through the heat medium as in the case of heat radiation, so the heat medium at the outlet of the heat exchanger (1) The temperature difference between the temperature and the melting temperature of the latent heat storage material, in addition to the temperature difference required for heat conduction from the heat medium to the latent heat storage material, is due to the sensible heat of the heat medium and the melting temperature of the latent heat storage material. A temperature difference is necessary to transfer heat to the device (2).In other words, the temperature of the heat medium at the outlet of the heat exchanger (υ) is equal to the temperature difference required for heat transfer between the melting thermometer of the latent heat storage material and the A temperature difference is required to transport heat by heat, and if you try to reduce the temperature difference required to transport heat by sensible heat, the required circulation amount of the heat medium increases, and the heat transfer pump ttC) Due to the large size, equipment costs and power costs increase.

For this reason, a temperature difference of more than a certain level is required to transport heat, and even in the case of heat storage, there is a drawback that the quality of energy is greatly degraded.

Therefore, the present inventors, in order to eliminate the above drawbacks,
In a patent application dated December 12, 1981, the following thermal energy recovery method was proposed. In other words, powdered pentaerythritol is used as a latent heat storage material, heat transfer oil is used as a liquid heat transfer medium, and these are mixed to form a slurry liquid. This uses a heat storage medium that exhibits fluidity and is significantly higher than that of a liquid heat medium.

FIG. 8 shows a specific example. In the figure, a slurry liquid heat storage medium made by mixing pentaerytritol (chemical formula C (CH20H)4) powder as a latent heat storage substance stored in a heat storage medium storage tank 0 with heat medium oil is used. Pressurize with pump (2) and send to heat exchanger (II). Pentaerythritol powder has a shape as close to a sphere as possible and has a particle size of 0.51111 or less (particle size of 50 to 100 microns is best). As the heat transfer oil, use Hytherm PS-5.
(manufactured by Nippon Oil), Sanimu S (manufactured by Nippon Steel Chemical Industries)
, Caloria HT-48 (manufactured by Exxon, USA), silicone oil, or other oil in which pentaerythritol does not dissolve is used.

Heat exchanger 03 has a flow rate of about 250 to 500°C and (
or) the heat storage medium is heated (receives heat) by the fluctuating temperature of the waste gas. In this case 1. Pentaerythritol in the W heat medium transfers to 822 at 188°C, absorbing a heat of transition of J/#. Therefore, even if the heat storage medium receives heat, the temperature IV of the heat storage medium remains at the transition temperature (phase change temperature (188° C.) of pentaerythritol) until all of the pentaerythritol in the heat storage medium is transferred.

For this reason, even when the flow rate and/or temperature of the waste gas flowing into the heat exchanger (Ll) reaches its maximum, the amount of heat storage medium sent out from the pump (2) is reduced. If the flow rate is set to a value higher than that at which all the pentaerythritol in the medium does not transfer, the temperature of the heat storage medium will remain at the transition temperature of pentaerythritol (188 °C), and by passing through heat exchanger 0, the amount of pentaerythritol contained in the heat storage medium transferred to the side that absorbed the heat of transition in heat exchanger 0 increased. It is returned to the heat storage medium storage tank Q1 in this state.

In this way, by transferring the pentaerythritol in the heat storage medium to the side that has absorbed the heat of transition, and absorbing heat from the waste gas, the temperature of the heat storage medium is kept constant (transition temperature of pentaerythritol (188°O)). ) to absorb heat, and by increasing the content of pentaerythritol in the heat storage medium storage tank 01) that has been transferred to the side that has absorbed the transfer heat, the temperature of the heat storage medium can be adjusted to the temperature of the pentaerythritol ( It is possible to store heat without raising the temperature (188°C).

Then, a slurry-like heat storage medium containing a large amount of pentaerythritol transferred to the side that absorbed the transfer heat, which was created by absorbing waste heat in heat exchanger 0, is stored in a heat storage medium storage tank (1η).

On the other hand, in order to take out the stored heat continuously, it is necessary to use a slurry heat storage medium (temperature 188°C) in the heat storage medium storage tank αη.
) is guided to the direct contact heat exchanger (g) by the heat dissipation heat storage medium pump a At the same time as the turbine Q is turned, the directly connected generator 0''h is turned to extract energy as electricity.The low-pressure fluorocarbon steam that exits near the fluorocarbon turbine 0 is cooled and liquefied by cooling water in the condenser. , is pressurized by the freon pump 00, and is preheated through the freon preheater (2), and then returned to the direct contact heat exchange 'aα→.

The heat storage medium that has transferred heat to the fluorocarbons is returned to the heat storage medium storage tank (I+) after the fluorocarbons are preheated by the fluorocarbon pump (1). In this case, the freon preheater (a) may not be necessary.

At this time, if we consider the direct contact heat exchanger αQ as a boiling heat exchanger, the heat storage medium and the working medium in the direct contact heat exchanger (c) (
Since the heat exchange with chlorofluorocarbons (chlorofluorocarbons) is boiling heat exchange, the relationship between heat exchange and temperature within the direct contact heat exchanger (g) is as shown in lines (c) and 2) in Figure 4. . line (c)
shows the temperature change when the working medium (fluorocarbon) turns into steam, and shows the same behavior as in the case of FIG. 2. That is, the working medium (fluorocarbon) is preheated in the fluorocarbon preheater (a), supplied into the direct contact heat exchanger oQ, raised from temperature To, and then heated to Th (gauge pressure) to extract steam of 1 g/cd. Then, it will start boiling at about 170°C) and remain at a constant temperature. On the other hand, as shown by the line in the heat storage medium, unlike the case in Figure 2, even if the heat is radiated (transferring heat to water) in the direct contact heat exchanger θ0, the heat storage medium does not contain any heat contained in the heat storage medium. Pentaerythritol, which has been transferred to a state in which it has absorbed heat, reversely transfers to a state in which it has released heat at the transition temperature (188°C), and releases heat of transition (822, J/9). Therefore, even if the heat storage medium releases heat, the temperature of the heat storage medium remains at the transition temperature (phase change temperature (188° C.)) until all of the pentaerythritol in the heat storage medium is transferred. Therefore, the heat storage medium radiates heat from the air sent out from the heat storage medium pump 0→ in the direct contact heat exchange type a, and even at the point where it exits the direct contact heat exchanger Ql, the air in the heat storage medium is If the flow rate is set at a level higher than that at which pentaerythritol does not transfer completely, the temperature of the heat storage medium will remain even though it passes through the direct contact heat exchanger QI9 (at both the inlet and the outlet) as shown in the line).
The transition temperature of pentaerythritol (188 °C) is constant and the pentaerythritol contained in the heat storage medium by passing through the direct contact heat exchanger (II9) is The heat storage medium storage tank (1
Return to υ.

This method uses a slurry heat storage medium, which is a mixture of powdered pentaerythritol and heat transfer oil, to store fluctuating amounts of waste heat by transferring pentaerythritol. It is designed to be taken out continuously, and in this way, the temperature of the heat storage medium can always be kept constant at the transition temperature (phase change temperature (188°C)) of pentaerythritol, regardless of the amount of heat stored at present. Heat exchangers (
No temperature difference is required other than the temperature difference required for heat transfer on the heat transfer surface of 11 or direct contact heat exchanger αO (no temperature difference required for transporting heat by sensible heat), compared to known latent heat storage devices. However, even with this method, it is necessary to transfer heat from the slurry-like heat storage medium to the working medium (fluorocarbon, etc.), and the heat transfer required for this purpose is The drawback was that the temperature/IW difference was unavoidable.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a thermal energy recovery method that overcomes the above-mentioned conventional drawbacks.

Composition of the Invention In order to achieve the above object, the thermal energy recovery method of the present invention uses microcapsules or microcapsules encapsulating a 40-change substance that absorbs and releases latent heat in response to heating and cooling. A powder of a transition material/Igo which absorbs and releases heat of transition according to the conditions described above is at least not solidified at the phase change temperature of the phase change material described above or the transition temperature of the transition material, and is a working medium of a heat engine. The slurry heat storage medium is suspended in a liquid suspension medium of The working medium vaporized in the medium storage tank is used to turn the turbine and recover stable power.This not only makes it possible to reduce the temperature difference required for transporting sensible heat to zero, but also to Since the temperature difference required for heat transfer between the oil and the working medium can be reduced to zero, the loss of exergy of waste heat is small, and waste heat can be converted into power efficiently.

Embodiment and Function An embodiment of the method of the present invention will be described below with reference to the drawings.

In FIGS. 5 and 6, reference numeral 121) denotes a heat storage medium total 1, in which a slurry-like heat storage medium is stored. This slurry heat storage medium is pentaerythritol (a transition substance) that absorbs and releases transition heat in response to heating and cooling.
The powder is converted into liquid Freon 113, which becomes the working medium of the heat engine.
(suspending medium). υ is supplied with waste gas of about 250 to 500°C that occurs intermittently or fluctuatingly, and the waste gas and the heat storage medium storage tank ← with the slurry heat storage medium sent from υ through the heat storage medium pump (to). This is a heat exchanger that performs heat exchange 7, and the heated slurry heat storage medium is returned to the heat storage medium storage tank υ through a pressure reducing valve @. (C) is a fluorocarbon turbine into which the vaporized working medium is introduced in the heat storage medium storage tank (2]), and a generator directly connected to the fluorocarbon turbine. This is a condenser into which a working medium (steam) is introduced, which is cooled and liquefied by cooling water, and the liquefied working medium is stored in a working medium storage tank (c). 2) is a working medium pump that pressurizes the working medium stored in the working medium storage tank (2) to the pressure in the thermal storage medium storage tank Qp and returns it to the thermal storage medium storage tank 621), and (to) is the bottom side of the thermal storage medium storage tank 01). The heat storage medium meter t is installed tangentially to
This is a feeding nozzle that feeds into Ia (b).

With this configuration, the slurry heat storage medium is first drawn out from the bottom of the heat storage medium storage tank 0p through the nozzle c1υ, pressurized by the heat storage medium pump 4, and sent to the heat exchanger (a). In this case, the pressure of the slurry heat storage medium is increased to at least a pressure at which pentaerythritol does not vaporize at its transition temperature (188° C.). In addition, use pentaerythritol powder with a particle size as close to a sphere as possible and a particle size of 0.5111 or less (particle size of 50 to 100 mL is best), and as a liquefied working medium, use Freon 11
8th Grade Pentae IJ) Uses a medium that is not commonly understood by Rittor.

In the heat exchanger plate, the slurry heat storage medium is heated (receives heat) by the waste gas whose flow rate and/or temperature varies from about 250 to 500°C. In this case, pentaerythritol in the slurry heat storage medium is 822°C at 188°C.
It undergoes transition by absorbing the heat of transition of KJ/kg. Therefore, even if the slurry heat storage medium receives heat, the temperature of the slurry heat storage medium will be the transition temperature of pentaerythritol (
It remains at the phase change temperature (188°O). Therefore, the amount of slurry heat storage medium delivered from the heat storage medium pump is
Even when the flow rate and/or temperature of the waste gas flowing into the heat exchanger is at its maximum, the flow rate must be greater than the flow rate at which all of the pentaerythritol in the slurry heat storage medium exiting from the heat exchanger gradient is not transferred. If set, the temperature of the heat storage medium will remain constant at the transition temperature of pentaerythritol (both inlet and outlet) even if it passes through the heat exchanger (support). The pentaerythritol contained therein was transferred to the side that absorbed the heat of transition during heat exchange at 3 J@, but it exits the heat exchanger in a state where the content has increased. After that, the heat storage medium storage tank■υ is opened using the pressure reducing valve (c).
The slurry heat storage medium is returned to the heat storage medium storage tank Cη. At this time, a part of the working rod vaporizes.

In this way, by transferring the pentaerythritol in the slurry heat storage medium to the side that has absorbed the heat of transfer and absorbing heat from the waste gas, the temperature of the slurry heat storage medium is kept constant (pentaerythritol, , X IJ' I- By increasing the content of pentaerythritol in the slurry heat storage medium in the heat storage medium storage tank eη that has been transferred to the side that has absorbed the heat of transition, by absorbing heat while maintaining the transition temperature of litol (188 ° C). It is possible to store heat without raising the temperature of the slurry heat storage medium at the transition temperature of pentaerythritol (188° C.).

Next, in order to continuously extract thermal energy from the slurry heat storage medium stored in the heat storage medium storage tank vertical υ, the vaporized working medium accumulated in the upper part of the heat storage medium storage tank e]) is transferred to a fluorocarbon turbine (c). By causing the gas to expand, the fluorocarbon turbine (c) is rotated, which turns the generator (7) directly connected to the shaft of the fluorocarbon turbine (c), and is recovered as electric power. In this case, when the vaporized working medium in the upper part of the heat storage medium storage tank 01) is extracted, the liquefied working medium in the heat storage medium storage tank 01) obtains heat from the pentaerythritol transferred to the side that has absorbed the heat. At the same time as the pentaerythritol is vaporized, the pentaerythritol transfers to the side from which heat has been released, its specific gravity increases, and it settles to the lower part of the liquefied working medium in the heat storage medium storage tank 01). In this case, the heat transfer from pentaerythritol to the working medium takes place on the surface of the fine pentaerythritol, so the heat transfer area is very large, so the heat transfer resistance is very small, and the temperature decreases as shown in Figure 7. (
There is almost no loss of exergy. In other words, if we consider the heat storage medium storage tank Q]) as a boiling heat exchanger, the heat exchange between the latent heat storage material and the working medium will be boiling heat exchange, so let's look at the relationship between heat exchange and temperature in the heat storage medium storage tank Q◇. and the line (e) in Figure 7 (temperature change of working medium), and (e)
(Temperature change of N heat storage material) This diagram is basically the same as Figure 4, but compared to the thermal conductivity from the heating medium to the working medium, this method has a very large It has thermal conductivity, and the lines (E) and (C) are very close to each other, making it possible to further reduce the temperature drop (exergy loss) compared to the latent heat storage device shown in FIG.

Furthermore, since the amount of heat storage is determined by the capacity of the heat storage medium storage tank 62◇, the amount of heat storage can be set regardless of the amount of heat inflow or release per unit time. Even after the construction of the heat storage device, the amount of heat storage can be easily increased by adding more heat storage medium storage tanks QD.

The low-pressure working medium steam leaving the fluorocarbon turbine (c) is cooled with cooling water in the condenser, liquefied, and stored in the working medium storage tank (to). The liquefied working medium stored in the working medium storage tank (2) is pressurized to the pressure in the heat storage medium storage tank (b) by a working medium pump (2), and is sent into the heat storage medium storage tank Qη.

In this case, since the feed nozzle (to) is installed at the position shown in Figure 6, the liquefied working medium fed into the heat storage medium storage tank QI) gradually rises while rotating and absorbs heat. It touches the pentaerythritol powder that has been transferred to the other side and is heated. On the other hand, the pentaerythritol powder gradually transfers to the side from which heat is released, increases its specific gravity, and settles, becoming a slurry liquid with the low-temperature liquefied working medium and passing through the nozzle C.
(The heat storage medium is sucked into the pump, pressurized, and sent to the heat exchanger.)

As the heat storage medium, one example is a mixture of pentaerythritol powder and liquefied Freon 113.
Although it was explained that a slurry-like heat storage medium is used,
The heat storage medium is not limited to this, but the type of latent heat storage agent used may also be used, such as using a slurry in which a latent heat storage agent that utilizes latent heat during melting is encapsulated in fine capsules and mixed with a liquefied working medium. Therefore, the same feature as described above can be exhibited, in that the temperature drop (loss of exergy) can be reduced compared to known latent heat storage devices, just by changing the heat storage temperature.

That is, when using a substance that utilizes transition heat as a latent heat storage material, a slurry liquid that is a mixture of a liquefied working medium and a powdered latent heat storage material is used, and as a latent heat storage material, a phase change containing heat of fusion is used. When using a substance that utilizes heat, the latent heat storage material is a powder sealed in fine microcapsules made of a material that does not melt at the temperature at which the latent heat storage material changes its phase and does not react with either the latent heat storage material or the liquid heat medium. A slurry liquid is used, which is a mixture of liquefied substances and a working medium.

Here, as the microcapsule material, synthetic resin, synthetic rubber, metal, glass, etc. are used.

Phase change substances to be encapsulated in microcapsules include polyalkylene glycols (e.g. polypropylene glycol, polyethylene glycol), paraffin wax, inorganic salt hydrates (e.g. sodium sulfate decahydrate, sodium carbonate decahydrate). - Heptahydrate Magnesium sulfate heptahydrate, magnesium nitrate hexahydrate, aluminum ammonium sulfate dodecahydrate, calcium chloride hexahydrate, etc., with an appropriate nucleating agent added. )
Examples include salt hydrate, potassium nitrate, eutectic mixture of lithium nitrate and sodium nitrate, high density polyethylene, and the like. The particle size of the microcapsules is usually 0.5 ff or less, preferably 100 microns or less, and the finer the particle size, the more preferable it is, as long as it does not impair the durability of the microcapsule membrane.

The liquefied working medium, which becomes the suspending medium, does not solidify at least at the phase change temperature of the phase change material encapsulated in the microcapsules because the obtained slurry exhibits fluidity at the applied temperature, and furthermore, it does not solidify at least at the phase change temperature of the phase change material encapsulated in the microcapsules. An appropriate substance is adopted as

Specific examples of working media include water, Florinol 85, Freon 118, Freon 11, Freon 114, normal butane, isobutane, Freon 12, ammonia, and Freon 22.
etc. are available.

The concentration of microcapsules in the suspension medium can vary within a wide range, but preferably 5 to 50% by weight is suitable.

Effects of the Invention According to the present invention, for example, the energy of waste heat that has been discarded until now but is emitted intermittently or fluctuatingly can be effectively utilized and extracted as stable thermal energy or electric energy in a continuous manner. It can be used effectively in various directions. In addition, a latent heat storage bag that passes a liquid heat medium into a fixed layer of latent heat storage agent↑
This was necessary in known methods using d. The temperature difference required for the transport of heat by sensible heat (inside the heat exchanger for heat storage,
This eliminates the need for heat exchange (both within the 8 heat exchangers for heat radiation) and also eliminates the need for a temperature difference to transfer heat from the heat medium oil to the working medium, making it possible to more effectively convert the exergy of waste heat into power. Furthermore, even in the effective use of solar heat, it is possible to obtain more power than in a method using a known latent heat storage device.

Moreover, since the heat storage medium storage tank that functions as the latent heat storage device may be a simple storage tank for slurry-like heat storage medium, the device is not only inexpensive, but also the amount of heat storage can be easily increased by adding more storage tanks.

[Brief explanation of the drawing]

@Figures 1 to 4 show conventional examples, Figure 1 is a flow sheet of a thermal energy recovery device according to the prior art, and Figure 21 is the working medium (fluorocarbon) in the direct contact heat exchanger of Figure 1.
A diagram showing the relationship between heat exchange and temperature between (a) and heat medium (b), Figure 8 is a flow sheet of a thermal energy recovery device that is an improved version of Figure 1, and Figure 4 is a direct contact diagram of Figure 8. An embodiment of the working medium method in a heat exchanger is shown, FIG. 5 is a flow sheet of a thermal energy recovery device employing the method of the present invention, FIG. 6 is a plan view of the heat storage medium storage tank in FIG. 5, and FIG.
The figure is a diagram showing the relationship between heat transfer and temperature between the working medium (fluorocarbon) (e) and the latent heat storage material (c) in the heat storage medium storage tank (direct contact heat exchanger) of FIG. 6. Ql)...heat storage medium storage tank, wire...heat exchanger, etc.)
...Front turbine, @ ... Generator agent Hiroaki Morimoto Yoshihiro Morimoto Modification of procuring procedures (voluntary) 1982 Patent Application No. 4120 2, Name of invention Thermal energy recovery method 3, Make amendments Relationship with the patent applicant name (511) Hitachi Zosen Corporation Telephone Osaka 06 (532) 4025 (main) name (
6808) Patent attorney Yoshihiro Morimoto 5, Date (shipment date) Showa year, month, day 6, Number of inventions increased by amendment 7, Column for detailed explanation of the invention in the specification subject to amendment ■ Invention of the specification Detailed explanation column (1) Page 6, line 14, correct [TO] to rTD J. (2) Page 7, line 15, correct r TOJ to rTD J. (3) Page 9, line 19 “S, l nee mus 1.!
Correct. (4) On page 13, line 5, "water" is corrected to "working medium." (2)

Claims (1)

[Claims] 1. Microcapsules encapsulating a phase change material that absorbs and releases latent heat in response to heating and cooling or powder of a transition material that absorbs and releases heat of transition in response to heating and cooling are added to the phase of the phase change material. A slurry-like heat storage medium is formed by suspending it in a liquid suspension medium that does not solidify at least at the changing temperature or the transition temperature of the transition material and serves as a working medium of a heat engine, and this slurry-like heat storage medium is used as a solar heat collector. Alternatively, thermal energy recovery is characterized in that after being heated through a heat exchange device including a heat pump, it is stored in a heat storage medium storage tank, and the working medium vaporized in the heat storage medium storage tank is used to turn a turbine and recover it as stable power. Method.