MULTIPLE GASEOUS PHASE SYSTEM TIDE RANGE POWER GENERATION METHOD

Abstract: The present invention comprises a container group formed by disposing in many stages a plurality of fixed containers (1,2, 3,4), each having an open lower surface and being capable of storing therein air, in parallel with one another and with predetermined gaps between them in a natural sea having the tide range; a container group formed by disposing in many stages a plurality of fixed containers (5,6,7,8), each having an open lower surface and being capable of storing therein air, in parallel with one another and with predetermined gaps between them in an artificial dam not affected by the tide range; and air pipes P for communicating each container of the container group in the natural sea with each container of the container group in the artificial dam. This apparatus obtains energy of compressed air at high tide due to a hydraulic presure resulting from the tide range, stores it in the artificial dam, transfers it into deeper containers at low tide, obtains compressed air with higher energy at high tide, and repeats these operations. The apparatus can concentrate the tide energy dispersed in a broad range.

Description: The invention relates to a tidal power converting apparatus with the features of the preamble of claim 1 as known from document GB-A-2 161 544. Further, reference is made to JP-A-5 644 265 which shows two groups of containers being in communication by air pipes. It is the object of the invention to provide a tidal power converting apparatus which produces air under high pressure using only a small area. According to the invention, this object is solved by the features of the only claim. Fig. 1 includes views of the embodiment at low tides, in the view A of which a container 1 above the surface of the sea is in a state of letting air naturally come therein, in view B of which a container 2 is in a state that the air is artificially transferred thereinto to stay as compressed air. Both the views are shown in cross sections. Fig. 2 includes views of the embodiment at high tides, the view C of which shows a state that the compressed air having first tidal energy is made in the container 1, the view D of which shows a state that second tidal energy is added to the compressed air in the container 2. Both the views are shown in cross sections. Fig. 3 is a cross sectional view at the time when the compressed air in the container 1 (the left in Fig. 3), which has been made in the state shown in the view C of Fig. 2 at the high tide, is transferred into a container 5 within an artificial dam (the right in Fig. 3). The transfer is conducted through an air pipe P by opening or closing a valve Q . Fig. 4 is a cross sectional view at the time when the compressed air (the right in the figure), which has been stored in the container 5 of the artificial dam shown in Fig. 3 at the high tide, is transferred into the container 2 (the left in the figure) in the natural sea at the low tide. The transfer is conducted through another air pipe P by opening or closing another valve Q . Referring first to the view A of Fig. 1, the container 1 lies above the surface of the sea at a low tide, and contains air. At this time, the containers 2, 3 and 4 are under water and has no air therein. When the tide has risen to result in the state shown in the view C of Fig. 2, as shown in Fig. 3, the compressed air in the container 1 is transferred into the container 5 within the dam through the air pipe to be stored therein. Then, after the tide has ebbed or lowered again, as shown in Fig. 4, the compressed air stored in the container 5 is transferred through the other air pipe P into the container 2 which is under the surface of the sea. The container 2 after the transfer comes into the state shown in the view B of Fig. 1. When the tide has risen again, the container 2 is in the state shown in the view D of Fig. 2, and the air more highly compressed is obtained. By repeating these steps in order, the compressed air is made in succession, so that the more highly compressed, energetic air for power generation can be obtained from the lowermost container 4 at the two high tides every day. Although not shown in the figures, the compressed air of a high pressure is transported to a gas turbine through air pipes to be used for power generation. At the high tide, the compressed air may surely be stored within the artificial dam when the storage in the containers within the artificial dam is conducted in the order that, at the beginning, the compressed air of the highest pressure is transferred in the lowermost container and, then, those of lower pressures are stored in the corresponding containers over the lowermost container. In contrast with this, at the low tide, when each compressed air within the artificial dam is transferred to the corresponding container in the natural sea, the transfer is started with the compressed air in the uppermost container and, then, those in the subsequent containers under the uppermost container are transferred. Thus, the invention is theoretically based on the realization of storage of the compressed air within the single dam in a three-dimensional manner. The above implies that sufficient tidal energy can be obtained even in a sea having a little tidal difference in height of the sea level if there is a certain three-dimensional room under the water. The Ariake Sea in Japan has only the maximum tidal difference of 4 meters in height of the sea level, but has a sufficient area. In such a sea, when using the apparatus of the invention, there is no need of providing the apparatuses all over the region of the sea. By digging down parts of the bottom of the sea, even when each apparatus provided is small in size, the sea water above the other parts of the bottom of the sea sufficiently flows into the dug part. This means that the tidal energy inherent in the region of the sea can be gathered to be converted into the form of the compressed air. Although the tidal energy thus obtained decreases considerably every time the compressed air is transferred between the containers, additional tidal energy is gained at every high tide to make up for the decrease. The reasons for the decrease are that part of the tidal energy is spent in transferring the compressed air, that part of the compressed air has to stay in the air pipes for transfer which make dead spaces between the containers, and that the air dissolves in the water little by little. With respect to the latter two reasons, the dead spaces can completely disregarded when the apparatus is continuously operated. The dissolve of the air may be dealt with by taking such measures of making small the area of the sea water to be in contact with the air or minimizing the movement of the sea water to minimize the dissolve of components of the air, such as nitrogen and oxygen. The transfer of the air between the containers is done, as shown in Figs. 3 and 4, through the air pipes which are provided on the respective bottoms of the inverted containers, or on the upper part partitions thereof, by opening or closing the valves. In theory, it is possible to transfer the air through the air pipes as far as a water depth a is larger than a water depth b in Fig. 3 or 4. With regard to the fixation of the containers for holding the air in the sea, although the fixation may be made in various ways, the way of providing supporting posts at the bottom of the sea and fixing the containers to the posts is easy to be taken. Each container having the air therein is largely buoyant, and gives rise to problems as to what material to be used for the container and how to fix the same. However, the problems would cause no technical difficulty if appropriate measures are taken against the buoyant force in addition to the utilization of the technology for constructing a gathering-place for fish.

Claims: A tidal power converting apparatus comprising a group of containers (1, 2, 3, 4) fixed in plural piles in a natural sea having a tidal difference in height of sea level, whereby said containers (1, 2, 3, 4) are spaced in parallel to one another at fixed intervals and each of said containers (1, 2, 3, 4) is opened at a lower side thereof and is capable of holding air therein, characterised in that another group of containers (5, 6, 7, 8) with the same configuration as the first group is fixed in tideless water within an artificial dam and that air pipes (P) provide communication between said respective containers (1, 2, 3, 4) of the group in the natural sea and said respective containers (5, 6, 7, 8) of the other group within the artificial dam, wherein at high tide first pipes (P) each provided with a first valve (Q) connect each of the containers (1, 2, 3, 4) of the first group with the respective container (5, 6, 7, 8) of the second group fixed on the same level and at low tide second pipes (P) each provided with a valve (Q) connect each except the upper most container (2, 3, 4) of the first group with the container (5, 6, 7) of the second group, which is fixed on one level higher.

Inventors: NOJIMA HISATAKE, NOJIMA, HISATAKE
Applicants: PARASIGHT YK, YUUGEN KAISYA PARASIGHT
Application year: 1989
Main classification: F03B13
IPC codes: F03B13