JP2665021B2 - Ocean current MHD power generation / magnetic separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ocean current MHD power generation that can generate electric power, extract ocean resources, and purify sea water by using ocean current energy, which is one of ocean energy. It relates to a magnetic separation system.

[Conventional technology]

(1) Ocean current MHD power generation The idea of magnetohydrodynamic power generation (power generation using the application of Magneto Hydro Dynamics, MHD power generation) was proposed by Firaday about 120 years ago, by moving a conductive fluid in a magnetic field. This is a method of generating electricity. The feature of this power generation system is that the structure is relatively simple and there is no portion that moves mechanically, and it is considered that the size can be relatively easily increased.

FIG. 2 shows the principle of MHD power generation. When a magnetic field B is applied in the z direction and the conductive fluid is moved at a speed u in the x direction, the conductive material in the conductive fluid is separated from the x direction by the action of the magnetic field and is bent from the x direction to the y direction. , As a result, super-power works in the y-direction. Therefore, if the electrode whose normal is in the y direction is arranged so as to be in contact with the conductive fluid, power can be taken out to an external circuit. The maximum output density p is represented by Pmax = (1/4) σ (uB) ² (1), where σ is the electric conductivity of the conductive fluid. From equation (1), it can be seen that it is necessary to increase the electrical conductivity, flow velocity, and magnetic field of the fluid to improve the power generation efficiency of the MHD generator.

In ocean current MHD power generation, an electromotive force is generated between electrodes when a conductive substance moves in a magnetic field as shown in the concept of FIG.
It applies the principle of MHD power generation to ocean currents. However, in order to improve the low power generation efficiency due to the low conductivity of the ocean current and the low flow velocity, a magnet capable of generating a strong magnetic field is required.

(2) High odor distribution Magnetic separation is a device that separates particles by magnetic force by passing trapped particles in a magnetic field. In recent years, the magnetic field is increased by enclosing a magnetic material (such as a tape) in the magnetic field. Since the development of "High Odor Distribution Magnetic Separation", high-speed separation of not only magnetic particles in liquids but also fine particles with a particle size of 1 μm or less has been possible, mainly for iron-making wastewater treatment. In addition, it is becoming possible to selectively separate magnetically separated particles by adsorbing a magnetic adsorbent onto the particles to be separated for separating particles having small magnetism.

As shown in the concept of Fig. 4, the application of high-odor magnetic separation to the ocean is thought to be effective in preserving the marine environment and extracting marine resources. Since large-scale seawater treatment requires a dramatic structure of magnetic separation efficiency, it requires a magnet that generates a strong magnetic field and a mixing / recovery facility for a magnetic adsorbent.

[Problems to be solved by the invention]

For practical use of ocean current MHD power generation and magnetic separation systems, it is necessary to use large normal magnets or superconducting magnets that can generate a strong magnetic field in a large space. The above-mentioned system alone poses a major problem in that equipment costs, running costs, and the like increase when the system alone is used.

[Means for solving the problem]

The present invention is based on the fact that a superconducting high-odor magnetic separation system for the purpose of extracting water-soluble resources from the sea and an ocean current MHD power generation system for the purpose of power generation use the same ocean current, and the structure of both systems is common. Focusing on the fact that there are many points, combining these will reduce the equipment cost and running cost and further improve the efficiency of ocean current MHD power generation, we will supply an ocean current MHD power generation-magnetic separation system, A magnet for generating a strong magnetic field provided facing the outer periphery of the water pipe, an electric power collecting electrode provided inside the upstream of the seawater pipe in a direction perpendicular to the facing direction of the magnet, and an inside of the downstream of the seawater pipe. And a device for adding a magnetic agent and a conductive agent adsorbed to the substance to be separated to the upstream side of the seawater pipe.

[Action]

According to the present invention having the above configuration, when the ocean current passes through the seawater pipe, power generation is performed on the upstream side, and the recovery of the magnetic agent is performed along with the recovery of marine resources and the like on the downstream side.

Further, since the conductive agent is added to the upstream side of the seawater pipe, the power generation efficiency is improved.

〔Example〕

 The present invention will be described with reference to FIG.

1 is a seawater pipe, 2 is a superconducting magnet, 3 is an electrode plate, 4 is a magnetic filter, and 5 is a conductive agent / magnetic agent addition device.

When the sea current to which the conductive agent and the magnetic agent are added and mixed by the conductive agent / magnetic agent adding device 5 flows into the seawater pipe 1, first, electric power is taken out by the electrode plate 3 on the upstream side. At this time, since the electric conductivity of the ocean current is increased by the action of the added conductive agent, a highly efficient power generation output is obtained.

Next, the substance to be separated (marine resources, harmful substances, etc.) to which the magnetic agent added is adsorbed by the magnetic filter 4 on the downstream side is recovered.

The magnetic agent is separated from the recovered substance and reused.

(1) Improvement of marine MHD power generation efficiency As an example, consider the case where sodium chloride, a seawater component, is added to increase electrical conductivity. In a magnetic field of 2.5 T, 4 mol / mol of sodium chloride was placed in a cylindrical seawater pipe with the same diameter and length.
If the highly concentrated seawater is allowed to pass through, as shown in FIG. 5, it is possible to obtain a power generation output one order larger than that of ordinary seawater with the same power generation size. Furthermore, if the seawater flow velocity is increased to 5m / s by equipping the seawater pipe with a duct, etc., Φ3.8m
An output of 1MW can be obtained with a power generation unit size of × 3.8m.

(2) Magnetic separation performance Considering, as an example, the collection of rounds, a seawater-soluble resource.
Active research and development has also been conducted on the round adsorbent magnetic adsorbent that mainly controls the uranium separation performance. Assume magnetic separation.

FIG. 6 shows the amount of seawater treated and the amount of rounds recovered per day in the case of full operation for 24 hours. If a magnetic separation device with a diameter of 1 m is installed, it will be approximately 200 g / da at a flow rate of 1-2 m / s close to the Kuroshio
If the flow velocity is increased to 5m / s, uranium immediately after 1kg / day can be obtained. Furthermore, when the diameter of magnetic separation is increased to 10m, the amount of recovered round becomes 100 times, and uranium of 20kg / day can be collected by using ocean current energy even at a flow rate similar to the Kuroshio. These results indicate that if a large-scale magnetic separation device is installed in a sea area that can sufficiently supply ocean current energy, there is a possibility that a sufficient amount of uranium can be recovered without using a pump or the like. This suggests that the concept of "current MHD power generation-magnetic separation system" is very significant.

〔The invention's effect〕

The features derived from the "connection" between the ocean current MHD power generation system and the magnetic separation system are listed below.

(1) Applicability to multi-systems By utilizing ocean current energy, it is possible to respond to energy and power systems, marine resource utilization systems, and environmental systems in a complex manner.

(2) Common use of facilities By combining various facilities such as superconducting magnets, seawater pipes, conductive agent / magnetic adsorbent addition equipment for ocean current MHD power generation and magnetic separation, equipment and running costs are reduced. Can be greatly reduced.

(3) Improving the efficiency of ocean current MHD power generation by adding a conductive agent By increasing the conductivity of seawater by adding a conductive agent to a magnetic adsorbent adding device that is indispensable for high-odor magnetic separation, it is possible to suppress an increase in equipment costs. Ocean current MHD power generation efficiency can be improved.

(4) By installing this system in the high-speed ocean current region, it is possible to improve both the ocean current MHD power generation efficiency and the magnetic separation and recovery efficiency.

[Brief description of the drawings]

FIG. 1 is an explanatory view according to one embodiment of the present invention, in which (a) is a conceptual diagram, and (b) and (c) are YY and XX of (a), respectively.
FIG. 2 is a diagram illustrating the principle of general MHD power generation, FIG. 3 (a) is a conceptual diagram of general ocean current MHD power generation, FIG. a) is a conceptual diagram of high odor distribution magnetic separation in the ocean, (b) is a YY arrow view thereof, FIG.
FIG. 6 is a diagram relating to the superconducting high odor distribution magnetic separation performance in the connection system. 1 ... seawater pipe, 2 ... superconducting magnet, 3 ... electrode plate, 4 ...
... Magnetic filter, 5 ... Conductor / magnetic agent addition device.

Claims (1)

(57) [Claims] 1. A magnet for generating a strong magnetic field provided outward on the outer periphery of a seawater pipe, and a power collection electrode provided inside the upstream side of the seawater pipe in a direction perpendicular to the facing direction of the magnet, A seawater MHD power generator, comprising: a material recovery magnetic filter provided inside the seawater pipe downstream; and an addition device for adding a magnetic agent and a conductive agent adsorbed to the substance to be separated to the seawater pipe upstream. -Magnetic separation device.