CONSTRUCTION METHOD FOR TIDAL POWER GENERATION SYSTEM CAPABLE OF MULTIPLE-FLOW POWER GENERATION FROM INSTALLATION OF UNIFLOW GENERATOR

Abstract

The present invention relates to a construction method for a tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator, and more particularly, to a construction method for a tidal power generation system, in which auxiliary waterways are installed at both sides of a hydraulic turbine waterway in which the uniflow generator is installed, respectively, such that water is introduced into one side auxiliary waterway so as to generate power, and the other side auxiliary waterway is connected to an existing drain waterway so that the water used to generate power may be drained, thereby enabling the multiple-flow power generation only by opening and closing a required sluice gate.

Claims

1. A construction method for a tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator, the construction method comprising: a hydraulic turbine waterway which has therein a generator and a hydraulic turbine, and is formed by forming hydraulic turbine waterway wall bodies at both sides thereof; auxiliary waterways which are formed by forming auxiliary waterway wall bodies at both sides of the hydraulic turbine waterway wall bodies so as to be spaced apart from the waterway wall bodies, and connected to the hydraulic turbine waterway so that water flows therebetween; and a plurality of sluice gates which has one end and the other end at which three waterways, which include a single hydraulic turbine waterway and two auxiliary waterways, are provided, and is opened and closed to introduce and drain water for rectification and multiple-flow power generation.

2. The construction method of claim 1, wherein the hydraulic turbine waterway and the auxiliary waterways are vertically installed, the waterway and the auxiliary waterway vertically communicate with each other, the three waterways, which include the single hydraulic turbine waterway and the two auxiliary waterways, are installed for each generator, and the auxiliary waterway includes a supply and drainage waterway function.

3. The construction method of claim 1, wherein the number of installed generators of the tidal power generation system is determined such that when a maximum height in a tidal range is 9 m, power generation is carried out with 80% of water for 4.5 hours, and a height of remaining water is about 1.8 m.

4. The construction method of claim 1, wherein the sluice gate is divided into three stages and configured to have a steplike shape so as to disperse a weight of the sluice gate and increase a speed of the sluice gate.

Description

DESCRIPTION OF DRAWINGS

[0044] FIG. 1 is a schematic top plan view of a construction method for a tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator according to an exemplary embodiment of the present invention.

[0045] FIG. 2 is an inner side view of a generator room illustrated in FIG. 1.

[0046] FIG. 3 is a front view of a construction method for a tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator according to another exemplary embodiment of the present invention.

[0047] FIG. 4 is a top plan view illustrating installation structures of a generator, a hydraulic turbine waterway, an auxiliary waterway, and a sluice gate in a generator room according to the construction method of the tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator as illustrated in FIG. 3.

[0048] FIG. 5 is a top plan view illustrating a construction method for a tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator according to still another exemplary embodiment of the present invention, in which a place with deep water or weak ground is dug deeply into a base rock layer, and multi-stage sluice gates and waterways are installed as lower layers of the hydraulic turbine waterway.

DESCRIPTION OF REFERENCE NUMERALS

[0049] 1: Hydraulic turbine waterway wall body [0050] 2: Waterway and Sluice gate [0051] 3: Generator [0052] 4: Bracket [0053] 5: Hydraulic turbine [0054] 6: Column [0055] 7: Entry passageway [0056] 8: Sleeve [0057] 20: Auxiliary waterway wall body [0058] 21, 22, 23, 31, 32, 33: Sluice gate [0059] 100: Multiple-flow tidal power generation system [0060] 101: Hydraulic turbine waterway [0061] 102: Auxiliary waterway

MODES OF THE INVENTION

[0062] Hereinafter, configurations and operations of exemplary embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that although the same constituent elements are illustrated in different drawings, the same constituent elements are referred to by the same reference numerals as possible.

[0063] In the following description of the present invention, the specific descriptions of publicly known related functions or configurations will be omitted when it is determined that the specific descriptions may unnecessarily obscure the subject matter of the present invention.

[0064] In addition, unless otherwise described, the word “comprise” and variations such as “comprises” or “comprising” will be understood to imply the inclusion of stated elements, not the exclusion of any other elements.

[0065] FIG. 1 is a schematic top plan view of a construction method for a tidal power generation system capable of multiple-flow power generation from an installation of a uniflow generator according to an exemplary embodiment of the present invention, and FIG. 2 is an inner side view of a generator room illustrated in FIG. 1.

[0066] FIG. 1 is a schematic top plan view illustrating a multiple-flow tidal power generation system 100 in which two auxiliary waterways 102a and 102b are continuously installed for a single generator 3 as the auxiliary waterways 102a and 102b are formed at both sides of a single generator hydraulic turbine waterway 101 one for each side, by installing auxiliary waterway wall bodies 20 at both sides of the generator hydraulic turbine waterway when installing a single layer generator room because water is not deep.

[0067] As illustrated in FIG. 1, the auxiliary waterway wall bodies 20 are installed at both sides of hydraulic turbine waterway wall bodies 1 so as to form the auxiliary waterways 102a and 102b, such that the auxiliary waterways 102a and 102b are connected to the existing hydraulic turbine waterway 101 so that water is introduced into the auxiliary waterway 102a in order to generate power, and a plurality of sluice gates 21, 22, 23, 31, 32, and 33 is configured, such that the auxiliary waterways 102a and 102b become a waterway for supplying power generation water and become a supply and drainage waterway after power generation.

[0068] Here, the sluice gate 21 is a sluice gate for power generation water of the existing generator hydraulic turbine, and the sluice gate 31 is a drain waterway sluice gate of the existing hydraulic turbine waterway.

[0069] In addition, the sluice gate 22 is a sluice gate for the supply and drainage waterway for auxiliary power generation water, the sluice gate 23 is a sluice gate for the supply and drainage waterway for auxiliary power generation water when the multiple-flow power generation is carried out in contrast, the sluice gate 32 is a sluice gate for the supply and drainage waterway serving as a drain waterway, and the sluice gate 33 is a sluice gate for the supply and drainage waterway serving as a drain waterway when the multiple-flow power generation is carried out in contrast. In this case, the waterway between the hydraulic turbine waterway wall body 1 and the hydraulic turbine waterway wall body 1 is a waterway having a high barrier, a bracket 4 for mounting the generator 3 is installed on the two hydraulic turbine waterway wall bodies 1 at an intermediate portion as the waterway having a higher barrier, the auxiliary waterway wall body 20 is connected, through a sleeve 8, to an intermediate portion of the auxiliary waterway between the auxiliary waterway wall body 20 and the hydraulic turbine waterway wall body 1 at a portion where the bracket 4 is installed, that is, the entire auxiliary waterways 102a and 102b at a side opposite to a side where the bracket 4 for fixedly installing the generator 3 is installed, thereby making a structure robust and reinforcing the multiple-flow tidal power generation system 100 so as to withstand a load of the generator 3.

[0070] In addition, as the auxiliary waterway wall bodies 20 are installed at both sides of one hydraulic turbine waterway wall body 1, the auxiliary waterways 102a and 102b are formed, such that water at the opposite side is introduced and passes through the hydraulic turbine 5 so as to carry out multiple-flow power generation when the sluice gate 23 is opened (see arrow ), a drain waterway, through which the water used for the multiple-flow power generation is drained, is formed when the sluice gate 33 is opened (see arrow ), and a supply and drainage waterway is formed when the sluice gates 22 and 23 of the auxiliary waterway 102a are opened in order to drain and accommodate remaining and less accommodated water after power generation.

[0071] In addition, a supply and drainage waterway is formed when the sluice gates 32 and 33 of the auxiliary waterway 102b are opened after power generation.

[0072] When the sluice gates 21 and 22 are opened, the sluice gates 31 and 33 are closed, and the sluice gate 32 is opened, forward direction power generation, in which water is introduced in a direction indicated by arrow and used to generate power and the water used to generate power is drained in the direction indicated by arrow through the sluice gate 32, is carried out. When the sluice gate 33 is closed and the sluice gates 31 and 32 are opened, primary uniflow power generation is carried out by two methods in which water is drained through the two sluice gates 31 and 32 in a direction indicated by arrow .

[0073] In addition, the power generation may be carried out by installing the generator in the opposite direction such that when the sluice gate 33 is primarily closed and the sluice gates 31 and 32 are opened, water is introduced and used to generate power, and the water used to generate power is drained through the sluice gates 21 and 22 when the sluice gates 21 and 22 are opened.

[0074] Secondary multiple-flow power generation is carried out by installing the auxiliary waterways 102a and 102b by auxiliary waterway wall bodies 20 for multiple-flow power generation at both sides of the hydraulic turbine waterway wall body 1 on which the existing uniflow generator 3 is installed, connecting the auxiliary waterways 102a and 102b with the existing hydraulic turbine waterway 1 so that water flows therebetween, and introducing water at the opposite side in a direction indicated by arrow through the sluice gate 23. When the sluice gates 31 and 32 are closed, water is drained to the sluice gate 33 through the waterway in a direction indicated by arrow , and water at the opposite side to the uniflow generator is introduced and used to carry out normal multiple-flow power generation.

[0075] That is, when power generation is carried out by opening the sluice gates 21 and 22, the water used to generate power is drained through the sluice gates 31 and 32 when the forward direction power generation is carried out, and in contrast, water is drained to the sluice gate 33 when multiple-flow power generation is carried out by opening the sluice gate 23.

[0076] The sluice gate 31 may be opened simultaneously with the sluice gate 32, thereby draining water used to generate power.

[0077] The interior of the generator room is in a vacuum state and filled with water, and the entire water in the interior flows simultaneously, and as a result, hydraulic energy of the water used to generate power is dispersed as much as an area of the waterway, such that it is possible to prevent the water used to generate power from flowing upward to a water surface outside the waterway and to a water surface of the inland sea or the open sea, thereby efficiently producing electric power.

[0078] In particularly, since the auxiliary waterways 102a and 102b become a supply and drainage waterway after power generation, it is not necessary to separately install the supply and drainage waterway, such that construction costs are not separately incurred and only installation costs for the auxiliary waterways are required, and as a result, multiple-flow power generation may be carried out in a state in which the uniflow generator is installed, and thus economic feasibility is very high. Non-described reference numeral 6 indicates a column for supporting the sluice gate, and non-described reference numeral 7 indicates an entry passageway in the generator room.

[0079] FIG. 3 is a schematic front view of a multiple-flow tidal power generation system according to another exemplary embodiment of the present invention, and FIG. 4 is a top plan view illustrating installation structures of a generator, a hydraulic turbine waterway, an auxiliary waterway, and a sluice gate in a generator room in a multiple-flow tidal power generation system as illustrated in FIG. 3.

[0080] As illustrated in FIGS. 3 and 4, a technology of installing a multi-stage weir-type waterway and a steplike sluice gate is applied, a place with weak ground below the generator room is dug deeply into a base rock layer, the hydraulic turbine waterway wall bodies 1 are installed uprightly, the auxiliary waterway wall bodies 20 are installed uprightly at both sides of the hydraulic turbine waterway wall body 1, and the waterway and the sluice gate 2 are installed in a steplike manner, and as a result, the interior of the generator room becomes a large space into which power generation water may flow, and a waterway between the waterway wall bodies 1 and 20 at the opposite side becomes a waterway of a space through which drain water may flow, such that it is possible to supply the amount of water sufficient to generate power and to sufficiently drain the water used to generate power.

[0081] In addition, since the supply and drainage waterway, through which remaining and less accommodated water may be drained and accommodated after power generation, is formed, a waterway area is sufficient, and a separate supply and drainage waterway need not be installed, such that additional construction costs are not incurred, and normal multiple-flow power generation may be carried out. In a case in which the generator room is installed at a place where a depth of water is 30 m, a waterway area is increased as a waterway height is increased, such that an area of an installation place of the generator room may be decreased. For example, a single-layer waterway, which has a width of 20 m and a height of 15 m so as to have an area of 300 m.sup.2, has the same area as a two-layer waterway which has a width of 10 m and a height of 30 m so as to have an area of 300 m.sup.2, but the installation length is decreased from 20 m to 0 m.

[0082] In addition, according to Korean Patent Application No. 10-2014-0055467 filed by the applicant, the ground is dug deeply into a base rock layer and the structure is installed, a waterway area may be 120% to 130% or more of the existing waterway area even though the structure is installed, such that reinforcing piling, sheet piling, and erosion prevention work need not be carried out, and a length of a cofferdam may be reduced, and as a result, it is possible to reduce construction costs, and economic feasibility is more improved by applying the structure when installing the generator room.

[0083] FIG. 5 is a top plan view illustrating a multiple-flow tidal power generation system according to still another exemplary embodiment of the present invention. As illustrated in FIG. 5, with a method of installing a multi-stage waterway in a steplike manner at a place where water is deep, a single multi-stage hydraulic turbine waterway 101 and a single multi-stage auxiliary waterway 102a are continuously installed in the generator room.

[0084] In a state in which the auxiliary waterway wall body 20 illustrated in FIG. 1 is not installed and the single multi-stage hydraulic turbine waterway 101 is installed, the multi-stage hydraulic turbine waterway 101 is installed to be spaced apart from one side of the hydraulic turbine waterway at an auxiliary waterway width interval that may become the auxiliary waterway 102a, and the single multi-stage auxiliary waterway 102a and the single multi-stage hydraulic turbine waterway 101 are continuously installed.

[0085] In this case, a sluice gate is provided at each stage of the waterways 101 and 102a, and water at upper and lower stages of the waterways 101 and 102a communicates with each other through the sluice gates.

[0086] In FIG. 5, the sluice gates 21, 22, 23, and 31 are sluice gates of an upper layer, and the sluice gates 21-1, 22-1, 23-1, and 31-1 are sluice gates of a lower layer.

[0087] With the aforementioned configuration, water is introduced from the sea by opening the sluice gates 23 and 23-1, the generator 3 is operated to generate power as the water passes through the hydraulic turbine 5, and the water used to generate power is drained to a reservoir by opening the sluice gate 21-1 at the lower layer, such that the auxiliary waterway wall body 20 illustrated in FIG. 1 is reduced, and the installation length of the generator room is reduced by ⅓, and as a result, it is possible to greatly reduce construction costs and carry out secondary normal multiple-flow power generation.

BEST MODE

[0088] First, when comparing a dam, which would be constructed by applying the present technology, with the existing installation method, it can be considered that a large amount of construction costs will be incurred if a number of supply and drainage waterways 102a and 102b serving as auxiliary waterways are installed in comparison with the existing construction costs, but a large amount of construction costs are not incurred.

[0089] In the existing installation method, a tunnel waterway, which is connected to a hydraulic turbine waterway in a generator room and passes through a reclaimed land, is not installed, and as a result, the existing civil construction costs are sufficient. As an example, in the Gangwha tidal power station as a preparation field for tidal power generation in Korean, a water storage area is 36.9 km.sup.2, fourteen generators having a height in a tidal range of 9 m are installed, twenty waterway, which include fourteen tunnel waterways passing through a reclaimed land in a hydraulic turbine waterway and six supply and drainage waterways, are installed to have a width of 20 m, a height of 15 m, and a length of 44 m with erosion prevention concrete of 30 m, and 40% of water is used to generate power. According to the development, the existing tunnel waterway passing through a reclaimed land is not installed, and water used to generate power flows from the generator room directly toward the sea and the reservoir. Therefore, with construction costs for installing the single existing tunnel waterway, a single auxiliary waterway wall body 20 and a one-third hydraulic turbine waterway wall body 1 may be installed and two auxiliary waterways 102a and 102b may be installed as illustrated in FIG. 1, or two auxiliary waterway wall bodies 20 and a two-third hydraulic turbine waterway wall body 1 may be installed and four auxiliary waterways, which include two auxiliary waterways 102a and two auxiliary waterways 102b, may be installed, such that the construction costs are sufficient. When 80% of water is used, twenty-eight generators are installed, and thus fifty-six supply and drainage waterways serving as auxiliary waterways are installed, such that the number of supply and drainage waterways is greater, by 50, than the number of existing supply and drainage waterway which is six, and as a result, a waterway area is sufficient, and additional construction costs are not incurred. The remaining construction costs corresponding to the six existing supply and drainage waterway are used as construction costs for a cofferdam that increases the installation length of the generator room, and as a result, additional civil construction costs are not incurred.

[0090] Second, power generation may be carried out for 4.5 hours, and remaining and less accommodated water having a height of 1.8 m may be completely drained naturally and fully accommodated naturally within one hour including time of stand of tide, thirty minutes, and as a result, it is possible to perfectly prevent a reduction in mudflats, damage to fishermen caused by the reduction in mudflats, and deterioration of water quality, and to carry out normal multiple-flow power generation. The tidal power generation is typically carried out when a head drop for enabling power generation is 1.8 m or higher, and when the head drop is decreased to 1.8 m, power generation is stopped, and remaining and less accommodated water is drained and accommodated. When power generation is carried out with 80% of water having a height in a tidal range of 9 m, a water height of 20% of remaining water is 1.8 m when a height in a tidal range is 9 m. Because the water is stored at a height of 1.8 m at one side after power generation, the time required to naturally treat remaining and less accommodated water may be calculated by calculating a flow velocity by applying a formula regarding natural fall of water.

[0091] The Gangwha tidal power station uses 40% of water by using fourteen uniflow generators and six supply and drainage waterways in the related art in a state in which a water storage area is 36.9 km.sup.2, and a height in a tidal range is 9 m.

[0092] The fourteen uniflow generators and the six supply and drainage waterways use 40% of water in the related art, but in the developed method, twenty-eight generators and fifty-six supply and drainage waterways serving as auxiliary waterways are installed and use 80% of water and 20% of water remains and is less accommodated, and the water is treated by the fifty-six waterways having a waterway width of 20 m and a height of 15 m.

[0093] amount of remaining water of 1.8 m: water storage area 36,900,000 m.sup.2×height of 1.8 m of remaining water=amount of remaining water 66,420,000 t

[0094] Here, a flow velocity of naturally falling water having a water height of 1.8 m is calculated by 9.8×2×1×1.8 m=√{square root over (35.28)}=5.939 m/s, and because a flow velocity is decreased as water is drained, an average flow velocity, which is a half value, is calculated to 2.9698 m.

[0095] Here, because the average flow velocity is 9.8×2×1×0.45 m=√{square root over (8.82)}=2.9698 m, an average water height when water is drained is 0.45 m when applying the average flow velocity.

[0096] When calculating the amount of water which may be drained and accommodated for one minute, the amount of water, which may be treated for one minute, is 20 m (waterway width)×15 m (waterway height)×56 (number of waterways)×2.9698 m/s (average flow velocity)×60 seconds=2,993,558 t, such that the amount of water, which may be treated for one minute, is calculated. Here, a water storage amount is 66,420,000 t÷ 2,993,558 t=22.187 when a height of remaining water is 1.8 m, such that water may be naturally and completely drained and fully accommodated, and there is some time of thirty-eight minutes when remaining and less accommodated water is drained and accommodated after power generation (the water, which is drained to the twenty-eight hydraulic turbine waterways, is not calculated), and as a result, the water may be naturally treated for one hour. In a case in which rating power generation cannot be actually carried out and a large amount of water remains even though the number of generators is set by calculating water for enabling rating power generation, and in a case in which a water height is 1.8 m or higher even though power generation is carried out by extending power generation time by thirty-eight minutes, two generators are further installed for example, and power generation is carried out, such that the amount of remaining water is decreased, and since the number of supply and drainage waterways serving as auxiliary waterways 102a and 102b is increased to four, the water may be naturally and sufficiently treated, and as a result, it is possible to perfectly prevent damage to mudflats and deterioration of water quality, minimize damage to fishermen, and enables normal multiple-flow power generation. The number of generators may be adjusted to be increased or decreased so as to solve all of the problems that hinder tidal power generation.

[0097] Third, it can be considered that power generation efficiency may deteriorate when water used to generate power is drained from the generator room directly to the sea, but the power generation efficiency does not absolutely deteriorate.

[0098] In the existing generator installation method, the hydraulic turbine waterway wall bodies are spaced apart from each other at one point and continuously installed, and waviness is formed on a bottom of the waterway passing through a reclaimed land in order to change a flow of water and thus improve efficiency, but it is considered that efficiency will greatly deteriorate in comparison with efficiency of a case in which the generator and the hydraulic turbine are manufactured and simulated. In addition, when ten generators are installed and all of the ten generators are operated, efficiency deteriorates, but when only one generator among the ten generators is operated, efficiency is equal to efficiency obtained when the generator and the hydraulic turbine are manufactured and simulated.

[0099] Because a flow velocity is high when water used to generate power is drained to the sea, the water flows upward a water surface by energy of water flowing when the water comes into contact with the sea water. In this case, when a height of the water flowing upward to the water surface is 0.5 m and a head drop of water for rating power generation is 4.8 m, efficiency deteriorates as much as a height of 0.5 m. That is, power generation is carried out with water having a head drop of 4.8 m, but a height of 0.5 m is lost, such that efficiency is obtained as power generation is carried out with a head drop of 4.3 m. In the existing generator installation, since the hydraulic turbine waterway wall bodies 1 are continuously installed in a single space, water cannot be quickly spread out laterally when the water is drained, and the water flows upward the water surface, such that efficiency deteriorates. However, in the present invention, since the two supply and drainage waterways 102a serving as auxiliary waterways and the two supply and drainage waterways 102b serving as auxiliary waterways are continuously installed to be spaced apart from each other when installing the single generator, a space in which water may spread out laterally is large, energy is quickly dispersed, and the amount of water flowing upward the seawater surface is small, and as a result, efficiency is higher than that in the related art, and there is no difference in efficiency between a number one generator and a number twenty generator.

[0100] Efficiency will be low when the number of installed generators is 20 than when the number of installed generators is 10.

[0101] When the ten generators are installed, the number one generator and the number ten generator may have the highest efficiency, and the number five generator and the number six generator may have the lowest efficiency. Because the number one generator and the number ten generator have the spaces where water may be quickly spread out laterally, a height of draining water is quickly decreased, and efficiency is high as much as the decrease in height, and because the number five generator and the number six generator are fitted in the middle and thus water is slowly spread out laterally, efficiency is low. The same reason applies to explain the fact that average efficiency is low when the twenty generators are installed than when the ten generators are installed. Power generation efficiency is higher when the generator is installed at a place where water is deep than when the generator is installed at a place where water is shallow, because water is quickly spread out when the water is deep.

[0102] While the technical spirit of the present invention has been described with reference to the accompanying drawings, the exemplary embodiment of the present invention has been illustratively described, and is not intended to limit the present invention. In addition, it is apparent that various modifications and imitations may be implemented by those skilled in the art without departing from the scope of the technical spirit of the present invention.

INDUSTRIAL APPLICABILITY

[0103] The present invention does not use the multiple-flow generator which has a purchase price higher by 50% or more than that of the uniflow generator, has a problem in that the hydraulic turbine blade breaks down due to a change in direction, and has a problem caused by power generation using a reverse flow. The present invention has been developed because there is an effect identical to an effect achieved when two uniflow generators are installed at both sides in the hydraulic turbine waterway, there are many economic effects, there is no problem with breakdown, and it is convenient to use because power generation is carried out only by opening and closing the sluice gate. The present invention completely solve the problems with tidal power generation in that mudflats are reduced, fishermen are damaged, water quality deteriorates because water is not smoothly circulated, power generation ends due to a reason that inhibits normal multiple-flow power generation, remaining and less accommodated water cannot be naturally treated, and a waterway area is insufficient. The present invention has been developed to quickly open and close the sluice gate in order to solve the problem in that time required to open and close the sluice gate is long and the time required to treat remaining and less accommodated water is shortened. The present invention solves all of the problems, which were obstructive factors against tidal power generation industries, and carries out normal multiple-flow power generation, and as a result, it is possible to increase the amount of generated electric power, minimize damage to environments and fishermen, reduce an electric power shortage, and reduce a large amount of carbon emission caused by thermal power generation, and as a result, clean energy industries for inhibiting warming of the earth will be activated.