JPS59110872A - Compound generation device which utilizes sea temperature difference and solar heat - Google Patents

Abstract

PURPOSE:To improve the efficiency of the cycle of sea temperature difference power generation by pumping-up the hot surface sea-water and forming the sea water having a relatively high temperature by a solar heat collector and evaporating working medium in an evaporator by said sea water and operating a turbine by said vapor. CONSTITUTION:The hot surface sea-water is pumped-up and sent into an evaporator 3 by a pump 2, and the thermal medium 4 having a low boiling point is formed into the steam having a high temperature and a high pressure through heat exchange, and said vapor is sent into a turbine 5, in which work is performed and a generator 6 is driven. The vapor having a low pressure which is sent from the turbine 5 is introduced into a condenser 7, and cooled, condensed, and liquefied by the cold sea water 8 in a deep layer, and the formed liquid is returned into the evaporator 3 by a circulating pump 9. In such a generation set which utilizes the sea temperature difference, a solar heat collector 20 is installed onto the downstream side of the evaporator 3 in a hot sea-water line or in a working medium line. Said heat collector 20 is preferably installed on the sandy beach on land, and the sea water and the working medium which passes through the heat absorbing pipe in the heat collector 20 can be heated efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combined power generation device that generates power using ocean temperature differences and solar heat.

Conventionally, power generation devices that utilize ocean temperature differences utilize the temperature difference between surface warm seawater (1) and deep cold seawater (8), as shown in the schematic configuration of Figure 1. The surface warm seawater (1) is pumped up by the warm seawater pump (2) and sent to the evaporator (3). The working medium (4) exchanges heat with warm seawater in the evaporator (3) and becomes high-temperature, high-pressure steam.
) (for example, ammonia, a low boiling point heat medium such as chlorofluorocarbon/propane) is sent to the turbine (5).

The working medium (4) is expanded to the low pressure side in the terpino (5) to drive the turbine (5), and power is generated by the generator (6) connected to the turbine (5).

The working medium (4) is discharged from the turbine (5) and is forced to low pressure.
) flows into the condenser (power), where it exchanges heat with deep cold seawater (8), condenses and liquefies, and is sent by the working medium circulation pump (9) to the evaporator (3) on the high pressure side, where it is sent to the Rankinsa Complete the contract.

Here, the surface warm seawater (1) is pumped up by the warm seawater pump (2) and sent to the evaporator (3) as described above, where the working medium (4) is heated and evaporated, and then returned to the ocean.

In addition, the deep cold seawater (8) is pumped up by a cold seawater pump 00), cooled and condensed in the working medium (4) in the aforementioned condenser (power), and then returned to the ocean.

The surface seawater temperature of the ocean mentioned above varies depending on the season and location, but it is approximately 20°C to 30°C, whereas the seawater temperature in the deep layer of 500 m or more is 4 to 10°C, so there is a difference between the two. The temperature difference is at most about 20°C.

As described above, since the temperature difference between the surface seawater temperature and the deep seawater temperature of the ocean is relatively small, the cycle efficiency is low and the electric power obtained from a unit amount of seawater is small.

In order to obtain electricity on a practical scale, a huge amount of seawater is required, which requires huge equipment, equipment costs and internal power costs, and the unit price of net generated electricity becomes high. , After all, the ocean temperature difference power generation device has the disadvantage of being low in economic efficiency.

On the other hand, solar thermal energy is abundant in the natural world, and the total solar radiation in Japan is 003 to 1°OKVm2 during the day, and the annual solar radiation is
It is said to be 400 KWH/m' year. This is equivalent to 30 to 100 KW of energy being poured onto the ground per I km' during the day.

Solar thermal power generation devices that generate power using the thermal energy of the solar energy are also known in Japanese Patent Application Laid-open No. 52-4624, No. 5, Japanese Patent Application Laid-Open No. 56-44411, and the like. The schematic configuration of one example is as shown in Figure 2.
Solar heat is collected by a collector (11), and the steam flowing through the system is heated and evaporated by the collector (0), enters the heat storage unit (1), then enters the turbine (13). ) to generate electricity by a generator α4) connected to the turbine (13). Turbine (13
) is condensed by the condenser (151) and returned to the collector (11) by the pump tte.

This solar power generation device cannot use solar heat at night, and only a small amount of solar heat can be used on rainy or cloudy days, so the amount of power generated fluctuates greatly, and a heat storage device is required to prevent this. It is. This has the drawback of increasing equipment costs and increasing the unit price of power generation.

The present invention solves the above-mentioned drawbacks of power generation using ocean temperature difference and power generation using solar heat, and provides a combined power generation device characterized in that a solar heat collecting facility is used in combination to improve the efficiency of the ocean temperature difference power generation cycle. The purpose is to provide

To avoid this, the combined power generation system using ocean temperature difference and solar heat according to the present invention includes a pump that pumps up surface warm seawater, and a solar heat collector that absorbs solar heat into the pumped warm seawater and turns it into relatively high-temperature seawater. (4) an evaporator that evaporates the working medium into the relatively high temperature seawater obtained by the heat collector; a condenser that condenses the working medium into the taken deep cold seawater; and the evaporator. and a turbine operated by the working medium circulating between the condenser and the condenser.

Further, the combined power generation device using ocean temperature difference and solar heat according to the present invention is characterized in that the solar heat collector is installed using a sandy beach on land.

Further, the combined power generation device using ocean temperature difference and solar heat according to the present invention is characterized in that the solar heat collector is composed of heat absorption pipes arranged on a surface of a sandy beach or concrete, and heats seawater by radiant heat. do.

Furthermore, the combined power generation device using ocean temperature difference and solar heat according to the present invention is characterized in that the solar heat collector is composed of a heat absorption tube buried in water-containing sand or water, and a coating on the heat absorption tube. do.

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 3(a) and 3(b) are system diagrams showing the general configuration of the combined cycle power generation device using ocean temperature difference and solar heat according to the present invention,
In Figure 3 (a), warm ocean surface seawater (1) is pumped up by a warm seawater pump (2), and is pumped up by a solar heat collector (
20) and then sent to an evaporator (3) to heat and evaporate the working medium (4), which is then returned to the ocean. The configuration of other parts is the same as that of the ocean temperature difference power generation device shown in FIG. 1, so the explanation thereof will be omitted.

In the above device, the solar heat collector is provided in the warm seawater line, but as shown in FIG. 3 (b), it may be provided in the working medium line to directly heat the working medium. In this case, the working medium (
4) is evaporated in the evaporator (3), heated by the solar collector (20), and then sent to the turbine (5) to generate electricity. Since the configuration of other parts is the same as the ocean temperature difference power generation device shown in FIG. 1, the explanation thereof will be omitted.

In addition, in Fig. 3 (a), 1 outlet), the solar heat collector (
A heat storage device may be provided downstream of 20) to increase heating efficiency.

By the way, solar heat collectors are easy to construct, inexpensive to construct, durable, and are not likely to be destroyed by abnormal weather such as typhoons. The unique feature of the heat collector is that it is installed on land, on a sandy beach, rather than on the ocean. The solar heat collector will be explained below. FIG. 4 is a schematic plan view of the solar heat collector. In the same figure, warm seawater or working medium is inlet pipe (2
]), enters the header (22), is then distributed to the header (next), is distributed to heat absorption pipes (23) provided in large numbers along its length, is collected again in the header (22'), and is then discharged from the outlet pipe (24). be done.

In this case, the solar heat collector (20) includes a dry type heat collector installed on a sandy beach or concrete on land, and a wet type heat collector buried in water-containing sand or water.

Figure 5 is a side view of the main part of a dry type heat collector, in which the heat absorbing tube (23) is installed on the surface of a sandy beach or concrete 1, etc., and the heat absorbing tube (23) is heated by the radiant heat of the sun's rays. Heats the seawater or working medium inside.

The example shown in Figure 6 is a wet type heat collector, in which two heat absorbing tubes are placed in sand or water containing water (including seawater).
3) is buried and covered with a film such as black polyethylene film 09 which has a high heat absorption rate (7).

The present invention provides a pump that pumps up surface warm seawater, a solar heat collector that absorbs solar heat into the pumped warm seawater and converts it into relatively high-temperature seawater, and a relatively high-temperature seawater obtained by the collector. an evaporator that evaporates a working medium by using water, a condenser that condenses the working medium using taken deep cold sea water, and a turbine that is operated by the working medium that circulates between the evaporator and the condenser. By providing this, the drawbacks of both ocean thermal power generation and solar thermal power generation can be eliminated, and solar heat can be used effectively by complementing each other, which is extremely useful industrially.

Next, because the solar heat collector of the present invention uses a sandy beach on land, it is easier to construct and can be installed at a lower construction cost and is more durable than when it is installed on the ocean, which is farther away from land. .

Furthermore, since the solar heat collector of the present invention is made of heat absorbing tubes arranged on the surface of a sandy beach, concrete, etc., the structure is simple and the construction cost is low. It also absorbs heat directly from the sun's rays and the radiant heat from the ground (8), further increasing thermal efficiency.

Furthermore, since the solar heat collector of the present invention is constructed by burying heat absorbing tubes in water-containing sand or water and coating the heat absorbing tubes with a film, the heat absorbing tubes can be placed in water (seawater) with a large specific heat. This has the effect of smoothing out the effects of the strength of sunlight and making it relatively less susceptible to the effects of temperature and wind.

[Brief explanation of the drawing]

Fig. 1 is a schematic system diagram of an ocean temperature difference power generation device, Fig. 2 is a schematic system diagram of a solar thermal power generation device, and Fig. 3 (4+ indicates the ocean temperature at which the solar heat collector according to the present invention is installed in a warm seawater line). Figure 3 (B) is a diagram similar to Figure 3 (C) in which the solar heat collector according to the present invention is installed in the working medium line, and Figure 4 is a schematic system diagram of a solar heat combined cycle power generation device. FIG. 5 is a schematic plan view of a solar heat collector according to the present invention, FIG. 5 is a cross-sectional view of a main part of a dry heat absorber according to the present invention, and FIG. 6 is a cross-sectional view of a main part of a wet-type heat absorber according to the present invention. ■... Surface warm seawater, 2... Warm seawater pump, 3... Evaporator, 4... Working medium, 5... Turbine, 6... Generator,
7. Condenser, 8. Deep cold seawater, 9. Working medium circulation pump, IO. Cold seawater pump, 11. Heat collector, 12
... Heat storage device, 13 ... Turbine, 14 ... Generator, 15
・・Condenser, 16 working・Pump, 20・・Solar heat collector,
21. Φ inlet pipe, 22.22'...header, 23...
Endothermic pipe, 24... Outlet pipe, 25... Coating. Figure 3 (A) Figure 3 (B) Drill 4 Figure 5 Bacteria Figure 6 Procedural Amendment (Voluntary) February 10, 1982 Commissioner of the Patent Office Kazuo Wakasugi 1, Indication of Case Patent Application 1982 No. 220235 2, Title of the invention Combined power generation system that makes full use of ocean temperature difference and solar heat 3, Person making the amendment Relationship to the case Applicant name Mitsubishi Heavy Industries, Ltd. 4, Successor agent 5, Date of amendment order Showa year, month Day 7: Contents of amendment (A) The description will be amended as follows. (1) The scope of patent claims will be amended as shown in the attached sheet. (2+ On page 3, lines 5-6, ``Rankine cycle'' is corrected to ``Rankine cycle''.) (3) On page 4, line 3, ``From unit seawater volume'' is changed to
"From the unit seawater volume," and the 12th line reads "30 to 100K.
WJ is corrected to ``300,000 to 1 million KWJ.'' (4) Page 7, lines 16-17, ``Solar heat... may be used.'' A heat storage device may be provided downstream of the heat device (20). ” I am corrected. (5) On page 8, line 2, "sandy beach" is corrected to "sandy beach, etc." CB) Add the code 24 and its leader line in red on the attached copy on page 4 of the drawing. Claims. 'For light - diagram

Claims (4)

[Claims] (1) A pump that pumps up surface warm seawater, a solar heat collector that absorbs solar heat into the pumped warm seawater and turns it into relatively high-temperature seawater, and is operated by the relatively high-temperature seawater obtained by the collector. It is characterized by comprising an evaporator that evaporates a medium, a condenser that condenses the working medium using taken deep cold sea water, and a turbine that is operated by the working medium that circulates between the evaporator and the condenser. A combined power generation device that uses ocean temperature difference and solar heat. (2) The combined power generation system utilizing ocean temperature difference and solar heat according to claim 1, wherein the solar heat collector is installed using a sandy beach or the like on land. (3) The ocean temperature difference according to claim 2, wherein the solar heat collector is made of heat absorbing tubes arranged on the surface of a sandy beach or concrete, and heats seawater by radiant heat; Solar thermal combined power generation device. (4) The ocean temperature difference according to claim 2, wherein the solar heat collector is made of a heat absorbing tube buried in water-containing sand or water, and the top of the heat absorbing tube is covered. and solar thermal combined cycle power generation equipment.