JPS59210264A - Wave force utilizing system - Google Patents

Abstract

PURPOSE:To obtain the wave force utilizing system, compact, high in capacity and easy in maintenance and inspection, by a method wherein the kinetic energy of wave is converted directly into heat by employing a positive displacement pump and a heating means. CONSTITUTION:When the sea surface (b) is moved up-and-down by the waves which are beating a shore, the volume of an air chamber 3 is increased and decreased, therefore, reciprocating airflows are caused in an air-duct 4. By the reciprocating airflow, a Wales turbine is rotated into a constant direction, the posi tive displacement pump 2 is driven and oil (c) circulates in a circulating circuit 6. The oil (c) is heated by a flow path resistance in case it passes through a multi-stage orifice 8 and the heat thereof is exchanged with the heat of water (d) in a secondary side circuit 14 in case it passes through a heat exchanger 13 and, thus, a part of heat, possessed by the oil (c), is taken out to the outside of the circulating circuit 6 through the water (d). Warm-water, thus reserved in a hot-water reserving tank 15, is introduced to the outside from a releasing path 17 in accordance with necessity and is utilized for melting snow on a road or the like.

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention is designed to convert the kinetic energy of ocean waves into heat, which can be used for heating houses and greenhouses, melting snow on roads, etc. This is related to a wave power utilization system.

3. Conventional Technology Recently, there has been an active development of clean energy utilization technologies, and one such system that has been attracting attention is a system that can effectively utilize the enormous kinetic energy possessed by ocean waves. There is.

By the way, conventional wave power utilization systems convert the vertical movement of the sea surface caused by waves into airflow, convert this airflow into rotational power using a turbine, and use this rotational power to drive a generator to obtain electricity. It is now possible to do so. However, in a system with such a configuration, theoretically, the energy conversion efficiency is low, so when the electricity obtained from the generator is further converted into heat by a heater etc. and used for hot water supply, space heating, snow melting on roads, etc. In this case, the capacity is low compared to the equipment.

(c) Purpose The present invention was made with attention to the above circumstances, and
The purpose of the present invention is to provide a wave power utilization system that can efficiently convert wave kinetic energy into thermal energy and use it with a simple configuration.

In order to achieve such an object, the present invention operates a positive displacement pump by wave force to cause the working fluid in the circuit to flow, and in this circuit, the hydraulic fluid flows in the circuit due to the flow path resistance. The present invention is characterized in that it is provided with a heating means for heating the liquid and a heat exchange means for extracting the heat held by the working liquid out of the circuit and making it available for use.

(e) Examples Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the wave power utilization system according to the present invention includes a resonant wave power conversion device 1 that converts wave energy into mechanical energy, and a positive displacement pump 2 driven by this device 1. It is equipped with Resonant wave power conversion device 1
is connected to an air chamber 3 whose lower end opening 3a opens into the sea and is attached to the front surface of an existing breakwater, etc., and whose volume increases and decreases as the sea surface moves up and down due to waves a, and one end communicates with this air chamber 3. An air duct 4 whose other end is open to the atmosphere, and which is interposed in the middle of the air duct 4 and is energized by the reciprocating air flow generated within the air duct 4 as the volume of the air chamber 3 increases or decreases. The Welsh turbine 5 is connected to the input shaft 2a of the positive displacement pump 2. and,
The outlet 2b and the inlet 2C of the positive displacement pump 2 are communicated via a circulation circuit 6, and the working fluid (for example, oil C) discharged from the outlet 2b from time to time when the pump is operated is transferred to the circulation circuit 6.
I try to circulate it through the

In addition, in the middle of this circulation circuit 6, a composite valve 7, a multistage orifice 8 serving as a heat generating means, and a jet booster 9 are sequentially provided.
A heat generating unit 12 is constructed by housing the jet booster 9 and the positive displacement pump 2 in a common oil tank 11. The composite valve 7 has an overspeed prevention mechanism that uses a speed limiter to keep the rotational speed of the turbine 5 below a set speed even in the event of excessive wave height, and a wax element that senses the oil temperature and utilizes the volume change when the wax changes phase. An overheat prevention mechanism configured to automatically stop the turbine 5 when the oil temperature exceeds a set oil temperature and automatically restart when the oil temperature returns to below the set oil temperature, and a manual switching mechanism for manually stopping the turbine 5. It will be equipped. Further, the multi-stage orifice 8 is for heating the oil C flowing in the circulation circuit 6 due to flow path resistance, and adopts a multi-stage cascade type. On the other hand, the jet booster 9 has a nozzle that injects oil C sequentially supplied from the outlet 2b side of the pump 2 from a small diameter injection port toward a throat forming a narrow oil passage, and a high-speed oil flow from this nozzle. The oil C in the oil tank 11 is pumped using the negative pressure state caused by being injected toward the throat.
An oil suction passage for introducing oil into the oil flow and a flow passage for oil C that has passed through the throat are gradually expanded to increase the static pressure of the oil spray C and apply a required boost pressure to the inlet 2C of the pump 2. and a diffuser for generating electricity. Further, a portion of the circulation circuit 6 located between the multi-stage orifice 8 and the jet booster 9 is extended outside the oil tank 11, and the heat held by the oil C is transferred to the extending portion of the circuit 6. A heat exchanger 5-13 is provided as a heat exchange means for taking the heat outside for use. To explain specifically, heat exchanger 1
3 is provided between the circulation circuit 6 and the secondary circuit 14, and is configured to handle the high temperature oil C flowing in the circulation circuit 6 and the low temperature secondary fluid flowing in the secondary circuit 14. , for example, can perform heat exchange with water d. 2
The next circuit 14 is configured to return water d taken out from the bottom of the hot water storage tank 15 into the hot water storage tank 15 via the heat exchanger 13, and is constructed of adiabatic piping. The hot water storage tank 15 is an insulated container installed near the place where hot water is used. It is connected to a release line 17 for releasing the water to the outside. Furthermore, a displacement type hydraulic motor 18 that is operated by being energized by the oil C flowing in the circuit 6 is interposed in the middle of the circulation circuit 6, and the circuit is disposed in the middle of the secondary circuit 14. A water pump 19 for circulating the water d in the water pump 14 is provided, and the water pump 19 is driven by the power of the hydraulic motor 18.

6- Next, the operation of this embodiment will be explained.

When the sea surface moves up and down due to the crashing waves, the volume of the air chamber 3 increases and decreases, causing a reciprocating air flow in the air duct 4. As a result, the Welsh turbine 5 disposed in the middle of the air duct 4 rotates in a fixed direction, and the positive displacement pump 2 is driven by the rotational power of the Welsh turbine 5. Then, the oil C inside the circulation circuit 6
The oil C flowing in the circuit 6 is heated by the flow path resistance when passing through the multi-stage orifice 8. When the oil C heated and raised in temperature in this way passes through the heat exchanger 13, it exchanges heat with the water d in the secondary circuit 14, and part of the heat held by the oil spray C is The water d
It is taken out to the outside of the circulation circuit 6 via. Note that when the oil C flows through the circulation circuit 6, the hydraulic motor 18 is activated to drive the water pump 19, so the water d in the secondary circuit 14 is energized by the water pump 19 and circulated. . That is,
The water d drawn out from the bottom of the hot water storage tank 15 is transferred to the heat exchanger 1.
The water d heated by passing through the heat exchanger 13 is returned to the hot water tank 15. Therefore, if such operation continues, the hot water tank 1
The temperature of the water d in the valve 5 gradually increases to a value close to the set temperature of the composite valve 7. The hot water thus stored in the hot water storage tank 15 is led out from the discharge system 17 as needed, and is used for melting snow on roads, etc.

Note that the heating means is not limited to a multistage orifice, but since a multistage orifice has excellent durability,
Reliability can be increased.

Furthermore, the hydraulic fluid is not limited to oil, and may be other fluids.

Furthermore, in the embodiment described above, a hydraulic motor is provided in the circulation circuit, and the hydraulic motor drives a pump that transfers the secondary fluid of the heat exchanger. However, the present invention is not limited to this; the hydraulic motor may be omitted and the pump may be driven by a special electric motor or the like.

Further, it goes without saying that the means for driving the positive displacement pump by wave force is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

(f) Effects Since the present invention has the above-described configuration, the following effects can be obtained.

First, the efficiency is extremely high because the kinetic energy of the waves is directly converted into heat using a positive displacement pump and a heat generating means such as an orifice, and this heat can be used as appropriate. In other words, excluding losses due to incomplete insulation, theoretically 100
A first order conversion efficiency of 96 can be obtained.

In addition, according to a method in which a positive displacement pump is used to flow the working fluid in the circuit, and this working fluid is heated by the resistance of the flow path, wave energy is converted into heat using only simple and technologically mature equipment. Can be converted into energy. Therefore, in addition to being highly efficient, it is possible to provide a wave power utilization system that is compact, has high capacity, and is easy to maintain and inspect.

Furthermore, when converting wave energy into mechanical energy using a turbine as in the above embodiment, by appropriately selecting the characteristics of the positive displacement pump and the orifice rate, etc., it is possible to convert wave energy into mechanical energy regardless of the wave height. The point of maximum turbine efficiency can always be the operating point. That is, it is possible to safely perform optimal load matching control without using any control power source.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with FIG. 1 being an explanatory diagram of the entire system, and FIG. 2 being an explanatory circuit diagram showing the main parts. 2...Displacement pump 6...Circuit (circulation circuit) 8...Heating means (multi-stage oriice) 13...Heat exchange means (heat exchanger) a...Wave b...Sea surface agent Patent attorney Hiroshi Akazawa 10- Figure 1 11

Claims (1)

[Claims] a positive displacement pump that is driven by wave energy to flow a working fluid in a circuit, a heating means that is interposed in the middle of the circuit and heats the working fluid flowing in the circuit due to flow resistance, and the working fluid 1. A wave power utilization system comprising: heat exchange means for extracting heat held by the circuit outside the circuit for use.