KR20090093856A - Power generation - hot water combination system - Google Patents

Abstract

A combination system for power generation and hot water supply is provided to stably use natural energy as the heat or the electricity regardless of the weather or season and to obtain the electricity by the power generation. A combination system for power generation and hot water supply comprises a temperature rising unit, a power generation unit(8), and a hot water supply unit. The temperature rising unit heats the medium through environmental heat and external heat source. The power generation unit obtains the electricity by expanding the medium. The hot water supply unit obtains the hot water from the heat of the medium which is expanded as the mean of generation. The environmental heat is the solar energy.

Description

Power generation combined use hot water system {POWER GENERATION-HOT WATER COMBINATION SYSTEM}

<1> The present invention relates to a power generation combined use hot water supply system that provides hot water using environmental heat and at the same time obtains electric power by power generation in a system.

<2> Solar energy is energy which is very close, and has been used for a long time as a water heater using solar heat, a solar cell using solar light, etc. (for example, following patent document 1, patent document 2, patent document 3, etc.). Reference). The hot water supply system using solar heat can obtain hot water at low cost and energy saving, and, in power generation using solar cells, electric power can be obtained by clean energy.

<3> However, in the solar hot water supply system, it can be used for hot water supply in the summer mainly in sunny weather, but an auxiliary heat source is indispensable in cloudy weather or winter time. In addition, in the summer when the weather is clear, the heat collected may remain only in the hot water supply depending on the region, resulting in an energy loss. As described above, in the hot water supply system using solar heat, hot water may become unstable depending on the weather and the season, and the effect on cost cannot be sufficiently obtained, and stable energy use that is not influenced by the weather and the season is expected.

<4> In addition, power generation using solar cells is a technology largely dependent on the price of a solar cell material (silicon), and although the amount of heat is excessively increased, the cost is greatly increased and it is not widely spread.

Patent Document 1: JP-P-2007-162969

Patent Document 2: JP-P-2006-349329

Patent Document 3: JP-P-2007-234795

The present invention provides a combined-use hot water supply system that generates hot water by using environmental heat and obtains electric power by power generation in a system, thereby providing natural energy regardless of weather or season. It aims at making it possible to use stably as heat and electric power.

<6> The combined temperature and hot water supply system of the present invention according to the present invention for achieving the above object includes: a temperature raising means for raising a medium by an environment heat and an external heat source; power generation means for expanding the medium to obtain electric power; It is characterized in that it is provided with hot water supply means for obtaining hot water by the heat of the medium which has been expanded by the power generating means and finished.

In the present invention of claim 1, the heat of the environment and the heat energy of the external heat source can be recovered by the electric power in the power generation means and the hot water supply in the hot water supply means, and the environment is balanced by balancing the power generation means and the hot water supply means. The hot water is used to heat the power, and the electric power generated by the power generation in the system can be stably obtained. As a result, natural energy can be used stably as heat or electric power regardless of the weather or season.

<8> In addition, according to claim 1, the combined heat and hot water supply system of the present invention according to claim 2 is characterized in that the heat of the environment is solar heat.

In the present invention of claim 2, hot water is supplied using solar heat, and power generated by power generation in the system can be stably obtained.

<10> In addition, according to claim 1 or 2, in the power generation combined hot water supply system of the present invention, the temperature raising means includes a hot air for collecting the heat of the environment and heating the temperature raising medium, and the temperature rising with the hot air. The medium is composed of heat storage means for circulating the heat medium from the external heat source and simultaneously circulating the medium to heat-exchange between the temperature raising medium and the heat medium to heat up the medium.

In the present invention of claim 3, natural energy can be recovered by hot water supply by electric power and hot water supply means by heat exchange between a temperature raising medium heated by environmental heat and a medium for power generation and hot water supply.

<12> The power generation combined-use hot water supply system according to the present invention of claim 4, wherein the temperature raising medium is water, and has a storage tank for storing the temperature rising medium that has been heated to become heated hot water, and stored in the storage tank. The heated hot water is circulated through the hot water supply means to be a heat source for obtaining hot water.

In the present invention of claim 4, a heating medium can be used as an indirect heat source for obtaining hot water.

<14> The hot water combined use hot water system of the present invention according to claim 5 is characterized in that the mixing means for mixing a portion of the heated hot water with the hot water obtained by the hot water supply means.

In the present invention of claim 5, a heating medium can be used as a direct heat source for obtaining hot water by mixing a part of heated hot water with hot water by a mixing means.

<16> The power generation combined use hot water system of the present invention according to claim 6, wherein the temperature raising medium is oil.

In the present invention of claim 6, boiling of the heating medium can be suppressed, and rusting of pipes and the like can be prevented.

<18> The power generation combined use hot water system of the present invention according to claim 7, wherein the oil is edible oil.

In the present invention of claim 7, since the temperature raising medium is cooking oil, it does not adversely affect the environment by waste oil treatment or the like.

<20> In the power generation combined hot water supply system of the present invention of claim 8, the external heat source is characterized in that the heat of combustion of fuel is used as a heat source.

In the present invention of claim 8, the external heat source can be stably secured.

In the power generation combined hot water supply system according to the present invention of claim 9, the external heat source is characterized in that the waste heat of the external device is a heat source.

In the present invention of claim 9, energy can be effectively used.

In the power generation combined hot water supply system of the present invention of claim 10, according to claim 8 or 9, wherein the medium heat-recovered by the hot water supply means is boosted and supplied to the heat storage means by the pressure increase means, The medium is heated to 85 ° C to 200 ° C, and in the power generation means, electric power is obtained by expanding the medium heated to 85 ° C to 200 ° C.

In the present invention of claim 10, the medium heated to 85 to 200 deg. C is expanded to obtain electric power, and the waste heat is 70 to 40 deg. C to serve as a heat source for hot water supply. As the power generation means, power generation power can be obtained by expanding a medium heated at 85 ° C to 200 ° C using a small rotary expansion mechanism of a circulation flow type.

In the hot water supply system for combined power generation of the present invention, hot water is heated using environmental heat, and power generated by power generation in the system can be obtained, and natural energy is used as heat or electric power regardless of weather or season. It becomes possible to use stably.

<65>

1

 It is a schematic system diagram of the power generation combined use hot water supply system of the first embodiment of the present invention.

2

 It is a schematic system diagram of the combined use hot water supply system of the second embodiment of the present invention.

3

 It is a schematic system diagram of the combined use hot water supply system of the third embodiment of the present invention.

[Figure 4]

 It is a schematic system diagram of the power generation combined use hot water supply system of the fourth embodiment of the present invention.

5

 It is a schematic system diagram of the combined use hot water supply system of the fifth embodiment of the present invention.

6

 It is a schematic system diagram of the power generation combined use hot water supply system of the sixth embodiment of the present invention.

<Code description>

<66> 1 solar collector

      2 circulation piping

      3 heat storage tank

      4 circulation pump

      5 heat exchange tank

      6 Medium circulation passage

      7 boost pump

      8 power generation means

      9 inflator

     10 generator

     11 boiler

     15 storage tank

     16 2nd Circulation Piping

     17 hot water pipe

     18 hot water circulation pump

     31 heavy water storage tank

A first embodiment and a second embodiment of the present invention will be described.

Figure 1 shows a schematic system of a hot water supply system for combined power generation according to the first embodiment of the present invention.

As shown in Fig. 1, a solar collector 1 as a heat collector for collecting solar heat is provided, and the solar collector 1 is configured to heat up water as a heating medium (heating means). The solar collector 1 is connected to the heat storage tank 3 as the heat storage means by the circulation pipe 2, and the water (heated hot water) heated by the solar collector 1 is circulated by the drive of the circulation pump 4. Through (2), it circulates between the solar collector 1 and the heat storage tank 3.

On the other hand, the heat exchange tank 5 in which a constant (for example, 15 degrees C or less) is stored is provided, and the medium circulation path 6 is provided between the heat storage tank 3 and the heat exchange tank 5. . The medium circulation path 6 is filled with, for example, a medium of a freon-based gas, and the medium heat-recovered in the heat exchange tank 5 is fed to the heat storage tank 3 by the boosting pump 7 as a boosting means. Hot water (for example, 85 ° C to 200 ° C) heated by solar heat is sent to the heat storage tank 3, and in the heat storage tank 3, the medium sent from the medium circulation path 6 is transferred. For example, it heats to 85 degreeC-200 degreeC.

The heated medium is sent to the power generation means (8) by the medium circulation path (6), and the medium (for example, 50 ° C.) that has finished work in the power generation means (8) is heat exchanged by the medium circulation path (6). It is sent to the tank 5, the constant (-15 degreeC) in the heat exchange tank 5 is heated, and it is sent to the medium temperature storage tank 31. In the warm water storage tank 31, for example, a medium having a temperature of 40 ° C. to 60 ° C. and a constant from the heat exchange tank 5 are heat-exchanged, and has a function of collecting water at 40 ° C. to 60 ° C., for example. The medium temperature water storage tank 31 uses the boiler 11 mentioned later, when internal water temperature falls, for example, to maintain the water temperature of 40 degreeC-60 degreeC.

The water collected in the hot water storage tank 31 becomes hot water of 40 ° C to 60 ° C, for example. The power generation means 8 is provided with an expander 9 (for example, a circulating flow type small scroll expander) for expanding a medium of, for example, 85 ° C to 200 ° C, and the rotary shaft of the expander 9 is a generator 10. Is connected to a rotor.

That is, for example, a medium of 85 ° C. to 200 ° C. is expanded in the expander 9 to obtain rotational power, and the rotational power of the expander 9 is transmitted to the generator 10 to generate electricity. (Eg, 700 W) is recovered. The medium which has finished work in the expander 9 is, for example, exhausted at 50 ° C., and is sent to the heat exchange tank 5 by the medium circulation path 6 to become a heat source of the hot water supply (water supply means).

In addition, a boiler 11 is provided as an external heat source for heating the heat medium by combustion of fuel (for example, city gas, propane gas, white kerosene, etc.), and the heat medium heated in the boiler 11 is a heat storage tank. It is supposed to circulate (3).

As the boiler 11, it is possible to apply a simple heating device such as a device or a portable stove installed in a predetermined place in advance.

In the heat storage tank 3, the medium of the medium circulation path 6 is, for example, by hot water heated by solar heat (for example, 85 ° C. to 200 ° C.) and a heat medium heated in the boiler 11. It heats to 85 degreeC-200 degreeC. In addition, the heat medium heated in the boiler 11 circulates through the heat exchange tank 5 to become a heat source of the hot water.

In the power generation combined use hot water supply system having the above-described configuration, the heat storage tank 3 has a function of collecting a medium of, for example, 85 ° C to 200 ° C and a function of heat exchange, and the heat exchange tank 5 is, for example, And a medium having a temperature of 40 ° C. to 60 ° C. and a constant of 15 ° C. or less, for example. In addition, the intermediate temperature water storage tank 31 has a function of heat-exchanging a constant temperature from the heat exchange tank 5 with a medium having a temperature of 40 ° C to 60 ° C, for example, and a water (hot water supply) having a temperature of 40 ° C to 60 ° C, for example. The heat exchange tank 5 has a function of collecting water, for example, 40 ° C. to 60 ° C. When the water temperature in the heat exchange tank 5 is lowered, the boiler By using (11) auxiliaryly, the water temperature in the heat exchange tank 5 is maintained at 40 to 60 degreeC, for example.

The operation of hot water supply and power generation in the above-mentioned power generation combined hot water supply system will be described.

In the solar heat collector 1, the temperature raising medium is heated by solar heat, and the heated water (for example, 85 ° C to 200 ° C) is sent to the heat storage tank 3 by the circulation pipe 2. The hot water (for example, 85 ° C. to 200 ° C.) heat recovered in the heat storage tank 3 is returned to the solar heat collector 1 by the circulation pump 4. Moreover, the heat medium heated by the boiler 11 circulates through the heat storage tank 3, and is heat-recovered.

In the heat storage tank 3, the medium is heated by the heat of the heating medium (heated hot water) and the heat medium (for example, 85 ° C to 200 ° C), and the heated medium is expanded in the expander 9 to generate the generator 10. ) Is a development. The exhaust (medium) of the expander 9 is sent to the heat exchange tank 5 in the medium circulation path 6 to recover the heat, and is sent to the heat storage tank 3 in the medium circulation path 6 boosted by the boost pump 7 again. It is raised. In the heat exchange tank 5, the exhaust (medium) of the expander 9 is heated by the exhaust (medium) sent from the medium circulation path 6 and the heat medium from the boiler 11 to supply hot water. Becomes hot water.

As a result, while hot water is supplied using solar heat, power can be obtained by power generation by power of expansion of a heated medium, and the solar heat, which is natural energy, is stable as heat or electric power regardless of weather or season. It becomes possible to use it very much.

That is, hot water for hot water supply can be stably obtained by the heat obtained by the solar collector 1 and the boiler 11. Then, power is generated by operating the expander 9 with a medium of 85 ° C. to 200 ° C. obtained at this time, and cooling is performed in summer in addition to the power of the auxiliary device (circulation pump 4, boost pump 7). You can use the power to power. For this reason, energy can be utilized effectively throughout a year regardless of a weather and a season.

As a result, by supplementing the boiler 11 with solar heat as the main energy source, the hot water supply can be stably maintained, and power consumption can be self-consumed in an auxiliary device or an air conditioner to be connected. As a standalone system, a simplified and stable system can be realized. In addition, since the main energy source is solar heat, the amount of CO2 emissions can be made almost close to zero, thereby realizing a home system that enables a significant CO2 reduction.

In addition, as the expander 9, for example, by using a circulating flow type small rotary expander, mass production of mechanical parts for inexpensive air conditioners can be facilitated, and a significant cost reduction can be achieved. Can be.

In addition, in the first embodiment, an example is described in which water from the heat exchange tank 5 is collected as hot water using the heavy water storage tank 31, but the medium circulates according to the difference in climate or region. If hot water of sufficient temperature (for example, 40 ° C. to 60 ° C.) can be obtained in the heat exchange tank 5 by the temperature of a constant temperature or a constant temperature, as shown in the second embodiment of FIG. The tank 31 can also be omitted.

The third and fourth embodiments of the present invention will be described.

Figure 3 shows a schematic system of a hot water supply system for combined power use according to a third embodiment of the present invention. In the combined heat and hot water supply system shown in Fig. 3, with respect to the first embodiment shown in Fig. 1, water (heated hot water) as a heating medium heated by the solar collector 1 is stored by installing a storage tank. It is supposed to be. For this reason, the description same as the member shown in FIG. 1 by attaching | subjecting the same code | symbol is abbreviate | omitted.

As shown in Fig. 3, a storage tank 15 is provided on an upstream side of the circulation pump 4, and a second circulation pipe 16 branching from the circulation pipe 2 is connected to the storage tank 15. It is. That is, a part of the heated hot water heated up in the solar collector 1 and heat-recovered in the heat storage tank 3 is collected in the storage tank 15. In addition, the storage tank 15 is provided with a hot water pipe 17 for circulating the heated hot water between the hot water storage tank 31 and the hot water pipe 17 is provided with a hot water circulation pump 18.

In the combined heat and hot water supply system of the third embodiment, a portion of the heated hot water (for example, 90 ° C to 110 ° C) that is heated up in the solar collector 1 and heat-recovered in the heat storage tank 3 is stored in the storage tank 15. Are collected in. When sunlight cannot be used due to cloudy weather or rain, the hot water circulation pump 18 is driven to distribute heated hot water to the hot water pipe 17 to circulate the heated hot water between the hot water storage tank 31. Thereby, heat exchanges with the constant from the heat exchange tank 5, and the water temperature in the middle temperature storage tank 31 is maintained at 40 to 60 degreeC, for example. As a result, the hot water supply can be stably performed regardless of the weather.

On the other hand, it is also possible to directly mix a part of the heated hot water flowing through the hot water pipe 17 with the hot water of the hot water supply (mixing means), and to directly recover the hot water temperature to maintain the hot water temperature.

In the third embodiment, the hot water storage tank 31 is used to collect the water from the heat exchange tank 5 as the hot water supply, and the heated hot water collected in the storage tank 15. Although the example of warming the hot water supply was described, the temperature of the heat exchange tank 5 sufficient for the temperature of the circulating medium or the constant temperature (for example, 40 ° C) based on the climate and the regional difference. If hot water supply of ˜60 ° C. can be obtained, it is also possible to have a configuration in which the hot water storage tank 31 is omitted, as shown in the fourth embodiment of FIG. 4. In this case, the heated hot water collected in the storage tank 15 circulates with the heat exchange tank 5.

The fifth and sixth embodiments of the present invention will be described.

FIG. 5 shows a schematic system of a power generation combined use hot water supply system according to a fifth embodiment of the present invention. In the combined-use hot water supply system shown in FIG. 5, the boiler 11 is omitted in the first embodiment shown in FIG. 1, and the waste heat (heat source) from the outside is stored in the heat storage tank 3 and the heat exchange tank 5. To circulate. For this reason, the description which attaches | subjects the same code | symbol to the member same as the member shown in FIG. 1, and overlaps is abbreviate | omitted.

As shown in FIG. 5, waste heat from an external device as an external heat source, for example, waste heat from a factory or waste heat from an incineration plant, is circulated to the heat storage tank 3 and the heat exchange tank 5. Waste heat circulation path 21 is installed. On the other hand, the heat source of the waste heat circulation path 21 may be a dedicated device using fuels such as city gas, propane gas, and kerosene.

By circulating the waste heat in the waste heat circulation path 21, the temperature increase of the temperature increase medium and the medium in the heat storage tank 3, and the medium temperature water storage tank 31 in the heat exchange tank 5 The maintenance of the temperature of water is performed. For this reason, the waste heat discharged | emitted to the environment which is not normally used can be utilized effectively.

5, the storage tank 15, the second circulation pipe 16, the hot water pipe 17, and the hot water circulation pump shown in FIG. It is also possible to install 18).

In the fifth embodiment, an example in which the water from the heat exchange tank 5 is collected as the hot water using the heavy hot water storage tank 31 has been described. If hot water of sufficient temperature (for example, 40 ° C. to 60 ° C.) can be obtained in the heat exchange tank 5 by a temperature of a constant temperature or a constant temperature, as shown in the sixth embodiment of FIG. The storage tank 31 can also be omitted.

1, 2, 5, and 6, an example in which water (heated hot water) is used as a heating medium for circulating the circulation pipe 2 has been described. It is possible to use. By using oil as a temperature raising medium, even if it becomes high temperature 100 degreeC or more, a temperature rising medium will not boil and it becomes possible to operate a temperature rising medium stably. In addition, it is not necessary to consider a countermeasure against rust in the circulation pipe 2.

It is also possible to apply cooking oil as oil. By using cooking oil as the oil of the heating medium, the waste oil is not affected by the environment.

In the first to sixth embodiments described above, the case where solar heat is used as the heat of the environment has been described as an example, but the heat is absorbed from the atmosphere, the refrigerant is compressed to circulate as a high temperature elevated refrigerant. It is also possible to apply a system to make it work.

In the above-described combined-use hot water supply system, hot water is heated using environmental heat, and power generated by power generation in the system can be obtained, and natural energy is stable as heat or electric power regardless of weather or season. It becomes possible to use it very much.

By the way, the breakdown of CO2 emissions in Japan can be broadly classified into the transportation sector, the industrial sector and the public welfare sector. While the proportion of industrial sector emissions in total CO2 emissions has recently been decreasing, the proportion of emissions in the public sector has tended to increase. Since the main combined energy supply system of the present invention is solar heat, the hot water supply system of the present invention is a household system capable of bringing CO 2 emissions to near zero and enabling a significant CO 2 reduction.

For this reason, by using the combined use hot water supply system of the present invention, it is possible to significantly reduce the CO2 of the public welfare section, and to reduce the proportion of the emission by the public welfare section in the total amount of CO2 emissions. Therefore, it can greatly contribute to the reduction of domestic CO2 emission. Moreover, energy consumption efficiency can be improved in the fields of hot water supply and heating and heating, which occupy more than half of the consumed energy.

Industrial availability

Industrial Applicability The present invention can be used in the industrial field of a power generation combined use hot water supply system which obtains electric power by power generation in a system while hot water is used using environmental heat.

Claims (10)

Heating means for heating the medium by the heat of the environment and an external heat source; Power generation means for expanding the medium to obtain power; And a hot water supply means for obtaining hot water by the heat of the medium which has been expanded by the power generation means and finished. The hot water combined use system of claim 1, wherein the heat of the environment is solar heat. The heat raising means according to claim 1 or 2, wherein the medium is circulated with the heat medium for collecting the heat of the environment to heat up the temperature raising medium, and the heat medium from the external heat source is circulated with the temperature raising medium heated by the heat exchanger. And heat storage means for heat-exchanging between the temperature raising medium and the heat medium to heat the medium. 4. The heating medium according to claim 3, wherein the heating medium is water, and has a storage tank for storing the heated medium that has been heated to become heated hot water, wherein the heated hot water stored in the storage tank is circulated by the hot water supply means to obtain hot water. Power generation combined use hot water system characterized by being a heat source. The hot water combined use hot water system according to claim 4, further comprising mixing means for mixing a part of the heated hot water with the hot water obtained by the hot water supply means. The hot water combined use hot water system according to claim 3, wherein the heating medium is oil. The hot water combined use hot water system according to claim 6, wherein the oil is cooking oil. The hot water combined use system according to claim 5 or 7, wherein the external heat source uses heat of combustion of fuel as a heat source. The hot water mixing system according to claim 5 or 7, wherein the external heat source uses waste heat of an external device as a heat source. 10. The heat storage means according to claim 8 or 9, wherein the medium heat-recovered by the hot water supply means is boosted by a boosting means, and the heat storage means heats the medium to 85 ° C to 200 ° C. An electric power combined use hot water supply system, characterized in that electric power is obtained by expanding said medium heated to 0.degree. C. to 200.degree.