WO2024071874A1

WO2024071874A1 - Power generation system using fluid circulation

Info

Publication number: WO2024071874A1
Application number: PCT/KR2023/014588
Authority: WO
Inventors: 정삼면
Original assignee: 정삼면
Priority date: 2022-09-28
Filing date: 2023-09-25
Publication date: 2024-04-04
Also published as: KR20220139837A

Abstract

The present invention relates to a power generation system using fluid circulation and, more particularly, to a power generation system using fluid circulation capable of recycling the fluid, by pumping fluid (water) stored in a water tank to a certain height and dropping the pumped fluid to generate electrical energy by means of height energy. The power generation system using fluid circulation, according to the present invention for solving the problem, comprises: a water tank for storing fluid; a water pump for pumping the fluid stored in the water tank; and a suction pipe disposed between the water pump and the water tank and is driven by the water pump to draw in the fluid in the water tank and transport same; a discharge pipe comprising an upward discharge pipe through which the fluid discharged from the water pump rises to a certain height, and a downward discharge pipe extending from the upward discharge pipe to guide the fluid into the water tank; and a generator installed in the downward discharge pipe to generate electrical energy by means of the height energy of the fluid being discharged.

Description

Power generation system using fluid circulation

The present invention relates to a power generation system using fluid circulation, and more specifically, by pumping fluid (water) stored in a water tank to a certain height and producing electrical energy using the height energy generated by dropping the pumped fluid, This relates to a power generation system using fluid circulation that can reuse fluid.

The use of small hydropower not only allows the production of electricity using domestic renewable energy resources, but also promotes regional development through the development of clean energy sources, and is known to have a significant economic ripple effect. Although small hydro power is a classic technology, it is a technology that can be established purely as a domestic technology that combines IT technology and eco-friendly technology, and the planning, design, and construction period is relatively quick.

Hydroelectric energy has played an important role as an energy source, although it accounts for only 14% of electricity production and 84% of the capacity of each power generation facility in Korea's energy policy reality.

First of all, hydroelectric energy has the advantage of excellent supply stability and long-term stable and cheap power generation prices, so it is worth continuously developing as an alternative energy to oil with high technological proficiency. In addition, hydropower is renewable and purely domestic energy, and it contributes to energy stability and the prevention of global warming as clean energy that does not emit carbon dioxide (CO2), so the need for development is increasing.

As a form of hydroelectric power generation, there is pumped hydro power generation that pumps water from the lower reservoir to the upper reservoir by operating a pump at night or when power is abundant, and then discharges the water to generate electricity when power is needed.

As one of the technologies for pumped storage power generation, a small hydro power generation system was disclosed in Registration Patent Publication No. 10-1933012.

The technology includes a storage tank in which liquid is stored; A pump that supplies the liquid stored in the storage tank to the point of use; A main line connecting the storage tank and the pump, as well as connecting the pump and the point of use; branch lines branching off from the main line; And one side is coupled to a storage tank, the other side is connected to a branch line, and includes a generator that generates power by liquid supplied through the branch line. The liquid that passes through the generator is supplied to the storage tank, and the pump operates at all times. It is characterized as a pump that recirculates the minimum flow rate to prevent overload due to the pump's flow not flowing.

In addition, Patent Registration No. 10-2125054 discloses a data center power and cooling water supply system using a tidal/pumped storage power generation system.

The technology includes a tidal power generation unit that is driven by tidal power to generate electrical energy; A pump for pumping sea water upward using electrical energy generated by the tidal current power generation unit; a storage unit where seawater transported by the water pump is stored; A small hydro power generation unit that generates electrical energy by seawater falling from the storage unit; It includes an integrated control unit that controls the tidal power generation unit, the pump, and the small hydro power generation unit, wherein the integrated control unit supplies power generated by the tidal power generation unit or power generated by the small hydro power generation unit to the data center. It is composed.

However, in the case of the above technologies, the height and capacity that can be pumped vary depending on the performance of the pump that pumps the fluid. Accordingly, as the capacity of the pump increases, more power is consumed, which reduces the efficiency of the cyclic power generation system.

The present invention was created to solve the above problems, and the problem to be solved by the present invention is to reduce the load on the pump and provide a power generation system using fluid circulation that can easily pump water even when a low-capacity pump is applied. It is to provide.

In addition, the aim is to provide a power generation system using fluid circulation that can produce and supply surplus electric energy while driving the pump through hydroelectric power generation by applying a low-capacity pump.

The power generation system using fluid circulation according to the present invention to solve the above problems includes a water tank in which fluid is stored; A water pump that pumps the fluid stored in the water tank; a suction pipe disposed between the pump and the water tank and sucking and transferring the fluid in the water tank by driving the pump; A discharge pipe including a discharge pipe that causes the fluid discharged from the pump to rise to a certain height and a discharge pipe that extends from the discharge pipe and guides the fluid to the water tank; It includes a power generation device installed in the discharge pipe to produce electrical energy using the height energy of the discharged fluid.

Here, it may further include a rainwater storage tank that stores rainwater and includes a rainwater supply pipe that supplies the stored rainwater to the discharge pipe, and the fluid stored in the rainwater storage tank compensates for the loss of fluid in the tank. , characterized in that it is supplied to the discharge pipe.

In addition, the water tank may be equipped with a multi-stage baffle that partitions a suction part where the suction pipe is immersed in the fluid and a drop part where the fluid discharged from the discharge pipe falls.

At this time, a screen that filters foreign substances contained in the fluid may be installed on the multi-stage baffle.

In addition, the power generation device is a first generator that produces electrical energy using a propeller water wheel installed inside the discharge pipe and a Pelton water turbine installed at the end of the discharge pipe. It includes a second generator that produces.

According to the present invention, the siphon principle is applied by the flow of fluid that is guided downward and passes through the discharge pipe, thereby reducing the burden on the pump, and as the burden on the pump is reduced, the power applied to the pump is reduced. As a result, there is an advantage that the power produced by the power generation device installed in the discharge pipe can produce surplus power excluding the power required to drive the pump.

In addition, the power generation system using fluid circulation according to the present invention can be applied not only to pico hydropower (5KW or less) but also to mini hydropower (100KW to 1,000KW), even in areas that are underserved by KEPCO. There are advantages that can be utilized.

In addition, since fluid loss is reduced through fluid recirculation, operating costs can be minimized, which has the advantage of producing power at low cost.

1 is a schematic diagram of a power generation system using fluid circulation according to the present invention;

Figure 2 is a configuration diagram of a power generation system using fluid circulation according to the present invention;

Figure 3 is a configuration diagram of a first generator applied to the power generation system using fluid circulation according to the present invention;

Figure 4 is a configuration diagram of a second generator applied to the power generation system using fluid circulation according to the present invention.

1 is a schematic diagram of a power generation system using fluid circulation according to the present invention.

Referring to the attached FIG. 1, the configuration of the power generation system using fluid circulation according to the present invention largely includes a water tank 10, a water pump 20, a suction pipe 30, a discharge pipe 40, and a power generation device 50. It consists of:

The water tank 10 has a predetermined shape, and fluid is stored therein.

In Figure 1, the top of the water tank 10 is shown as open, but it can be closed with a cover to prevent foreign substances from entering and to prevent safety accidents such as drowning.

The water pump 20 performs the function of pumping fluid (or water, hereinafter referred to as 'fluid') stored in the water tank 10 using electrical energy, and may be configured as a general pump.

The suction pipe 30 is disposed between the water tank 10 and the water pump 20, so that one side is immersed in the fluid stored in the water tank 10, and the other side is connected to the suction part of the water pump 20. do.

The discharge pipe 40 includes an upper discharge pipe 41 and a lower discharge pipe 42.

The discharge pipe 41 raises the fluid discharged from the discharge part of the pump 20 to a certain height, and the discharge pipe 42 extends to the discharge pipe 41 and transfers the fluid to the discharge pipe 41. The fluid is guided into the water tank (10).

The power generation device 50 is installed on the flow path of the discharge pipe 42 and produces electrical energy by using the height energy of the fluid falling through the discharge pipe 42.

To elaborate, the fluid stored in the water tank 10 is sucked into the suction pipe 30 by the pump 20 and rises to a certain height through the discharge pipe 40. As the raised fluid falls through the discharge pipe 40 disposed downward, it drives the power generation device 50 installed in the discharge pipe 40, and electric energy is produced by driving the power generation device 50.

Additionally, the fluid used to drive the power generation device 50 flows into the water tank 10.

The electrical energy produced by the power generation device 50 is used to drive the pump 20, and the surplus electrical energy (power) is transmitted to the outside to supply power.

In the above configuration, the electrical energy required for the initial operation of the water pump 20 uses renewable energy such as wind power or solar power, electrical energy previously stored in a battery, or electricity produced by a power generation device using fossil fuel. Energy can be used.

When the pump 20 is driven in a state where there is no fluid in the suction pipe 30 and the discharge pipe 40, the pump 20 uses a relatively large amount of electrical energy to suck and pump the fluid in the water tank 10. It is consumed.

However, when the fluid discharged by driving the pump 20 is transferred to the discharge pipe 42 through the discharge pipe 41, the fluid induced in the discharge pipe 42 falls by gravity, and the fluid A vacuum force is generated due to the drop, resulting in the effect of pulling the fluid discharged from the water pump 20. That is, according to the principle of the siphon, the fluid falling from the discharge pipe 42 has the effect of attracting the fluid in the suction pipe 41 and the discharge pipe 41.

In detail, during initial operation, the pumping device 20 must bear the burden from the height of the fluid stored in the water tank 10 to the first height h1 of the suction pipe 30 and the discharge pipe 41. Thereafter, when the pumped fluid is transferred to the discharge pipe 42 and discharged through the discharge pipe 42, the fluid discharged from the pump 20 due to the siphon principle caused by the fluid falling into the discharge pipe 42. attracts fluid. In this state, the pumping height that the pump 20 must bear is a third height (h2) subtracted from the first height (h1) by the second height (h2) corresponding to the installation height (length) of the discharge pipe 42. You only need to pay h3).

However, considering the loss caused by the operation of the pump 20 and the friction between the fluid and the inside of the pipe while passing through the suction pipe 30 and the discharge pipe 40, the pumping height that the pump 20 must bear is the third It can be relatively higher than the height (h3).

Even so, when the siphon principle is activated by the fluid falling into the discharge pipe 42, the pumping height borne by the pump 20 becomes relatively lower than the first height h1, and the corresponding The burden on the water pump 20 is reduced.

Figure 2 is a configuration diagram of a power generation system using fluid circulation according to the present invention.

Referring to the attached FIG. 2, the power generation system using fluid circulation according to the present invention includes a water tank 10, a water pump 20, a suction pipe 30, a discharge pipe 40, a power generation device 50, and a rainwater storage tank ( 60).

Each of the above components will be described, but descriptions of parts that overlap with the description of FIG. 1 will be omitted.

The fluid discharged from the discharge pipe 42 of the discharge pipe 40 may fall into the water tank 10 and generate air (bubbles) inside the fluid. When bubbles generated inside the fluid flow into the suction pipe 30, the pumping capacity of the pump 20 is reduced.

Accordingly, the water tank 10 has a multi-stage baffle 11 that divides the suction part 10a, where the suction pipe 30 is immersed in the fluid, and the falling part 10b, where the fluid discharged from the discharge pipe 42 falls. Can be installed.

The multi-stage baffle 11 stabilizes the flow of fluid dropped in the dropping portion 10b and prevents air bubbles from entering the suction pipe 30, and is relatively higher than the height of the fluid stored in the water tank 10. The first baffle 11a is formed high and exposed to the upper part of the fluid and has an opening through which the fluid moves at the lower part, and is formed relatively lower than the height of the fluid stored in the water tank 10, so that the upper part is immersed in the fluid and the upper part is immersed in the fluid. It is configured to include a second baffle (11b) through which fluid moves to the side.

In addition, various foreign substances may flow into the water tank 10.

Fluid containing foreign substances reduces the pumping ability of the pump (20).

Accordingly, in order to filter out foreign substances contained in the fluid, a screen 12 is installed at the opening of the multi-stage baffle 11 to filter foreign substances contained in the fluid.

That is, the screen 12 may be installed in the opening of the first baffle 11a or on the upper part of the second baffle 11b, and may be installed between the opening of the first baffle 11a and the second baffle 11b. ) can be installed on both sides.

The discharge pipe 40 extends to the discharge pipe 41, which causes the fluid discharged from the pump 20 to rise to a certain height, and the discharge pipe 41 extends to lead the fluid to the water tank 10 ( 42), but may further include a horizontal flow pipe 43 connecting the discharge pipe 41 and the discharge lower pipe 42.

The power generation device 50 is a first generator 51 that produces electric energy using height energy generated by the transfer of fluid falling into the discharge pipe 42 and discharges electricity from the end of the discharge pipe 42. It may be configured to include a second generator 52 that produces electrical energy by using the falling fluid.

Figure 3 is a schematic configuration diagram of a first generator applied to the power generation system using fluid circulation according to the present invention.

Referring to the attached FIG. 3, the first generator 51 includes a propeller water turbine 51a installed inside the discharge pipe 42 and a shaft 51b that transmits the rotation of the propeller water turbine 51a. and a power generation module (51c) that produces electrical energy using the rotation of the shaft (51b).

In the above configuration, the discharge pipe 42 is configured to be bent at a predetermined angle.

In addition, the shaft 51b is installed through the bent portion of the discharge pipe 42 and is rotatable, but is sealed to prevent water leakage.

According to the above configuration, the first generator 51 causes the fluid falling through the discharge pipe 42 to rotate the propeller wheel 51a, and produces electric energy using the propeller wheel 51a. do.

Figure 4 is a schematic diagram of the second generator applied to the power generation system using fluid circulation according to the present invention.

Referring to the attached FIG. 4, the second generator 52 produces electrical energy using a Pelton water turbine 52a installed at the end of the discharge pipe 42.

Meanwhile, if the discharge pipe 42 is filled with fluid, the power required during initial operation of the water pump 20 can be reduced.

In addition, the power generation system of the present invention can minimize fluid loss by circulating the fluid in the water tank 10, but the fluid stored in the water tank 10 may be reduced due to evaporation of the fluid.

Accordingly, in order to reduce the power required during the initial operation of the water pump 20 and maintain a constant level of fluid stored in the water tank 10 or compensate for loss, fluid must be supplied.

In the present invention, rainwater can be used to fill the discharge pipe 42 with fluid or to replenish lost fluid.

The rainwater storage tank 60 is used to store rainwater and supply fluid into the tank 10 or the discharge pipe 42 as needed.

At this time, the rainwater storage tank 60 has a rainwater supply pipe 61 for supplying the stored rainwater fluid to the discharge pipe 42, and is branched from the rainwater supply pipe 61 to supply rainwater to the tank 10. Includes a fluid replenishment flow pipe (62). In addition, a supplementary fluid control valve (60a) is further installed to control the flow path of the rainwater supply pipe (61).

In the above, when filling the discharge pipe 42 with fluid during the initial (first) operation of the pump 20, the discharge pipe 42 is installed to prevent the fluid supplied from the rainwater storage tank 60 from being discharged. A fluid discharge control valve (42a) is installed to control the discharge of fluid, and the fluid supplied from the rainwater supply pipe (61) is installed in the horizontal flow pipe (43) between the discharge pipe (41) and the discharge lower pipe (42). An air discharge valve (43a) is installed to discharge the internal air.

Accordingly, when the supplementary fluid control valve (60a) is opened while the fluid discharge control valve (42a) is closed and the air discharge valve (43a) is open, the fluid stored in the rainwater storage tank (60) is discharged. It flows into the upper pipe 41 and the discharge pipe 42.

When the discharge pipe 41 and the discharge pipe 42 are filled with fluid, the air discharge valve 43a is closed, the fluid discharge control valve 42a is opened, and the pump 20 is driven. , the power required for initial operation of the pump 20 can be reduced.

In addition, in order to maintain the water level at which the fluid in the water tank 10 is stored constant or to compensate for loss, the fluid stored in the rainwater storage tank 60 is supplied to the water tank 10 through the fluid supplementary flow pipe 62. It is composed.

At this time, the fluid replenishment flow pipe 62 may be configured with a control valve (not shown in the drawing) that regulates the flow path, and the control valve includes a water level sensor (not shown in the drawing) that detects the fluid level in the water tank 10. It can be configured to be driven in conjunction.

Claims

A water tank (10) in which fluid is stored;

A water pump (20) that pumps the fluid stored in the water tank (10);

A suction pipe 30 disposed between the pump 20 and the water tank 10 and sucking and transferring the fluid in the water tank 10 by driving the pump 20;

A discharge pipe including a discharge pipe 41 through which the fluid discharged from the pump 20 rises to a certain height, and a discharge pipe 42 extending from the discharge pipe 41 to guide the fluid into the water tank 10. (40); and

A power generation device (50) installed on the flow path of the discharge pipe (42) to produce electrical energy using the height energy of the discharged fluid;

A power generation system using fluid circulation, characterized in that it includes.
In claim 1,

A rainwater storage tank (60) that stores rainwater and includes a rainwater supply pipe (61) that supplies the stored rainwater to the discharge pipe (42);

It is composed further including,

A power generation system using fluid circulation, characterized in that the fluid stored in the rainwater storage tank (60) compensates for fluid loss in the water tank (10) or is supplied to the discharge pipe (42).
In claim 1,

The water tank 10 is,

Fluid circulation, characterized in that a multi-stage baffle (11) is installed to partition the suction part (10a) where the suction pipe (30) is immersed in the fluid and the falling part (10b) where the fluid discharged from the discharge pipe (42) falls. Power generation system using .
In claim 3.

A power generation system using fluid circulation, characterized in that a screen (12) is installed on the multi-stage baffle (11) to filter foreign substances contained in the fluid.
In claim 1,

The power generation device 50,

A first generator (51) that produces electrical energy using a propeller water wheel installed inside the discharge pipe (42); and

A second generator (52) that produces electrical energy using a Pelton water wheel installed at the end of the discharge pipe (42);

A power generation system using fluid circulation, characterized in that it includes.