JP2004003210A - Dredge pump and dredging system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dredge pump device which prevents agitated water with deposits at a water bottom from diffusing into and contaminating areas around the site of dredging and downstream regions during dredging, and also to provide a dredging system causing no environmental contamination. <P>SOLUTION: The dredge pump device is provided with a jet pump 41 for sucking and discharging sludge at a water bottom using a high-pressure jet of water, and a cylindrical suction control cylinder 11 provided around the jet pump 41 for controlling a suction range. The deposits dredged by the dredge pump device are dried and cultured to refine methane gas. Electric power produced by driving a fuel cell with the methane gas is used as a drive source for a variety of dredging systems. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dredging pump device and a dredging system for dredging a sediment deposited on a water bottom.
[0002]
[Prior art]
Conventionally, sediment flowing from upstream in reservoirs, sabo dams, rivers, ports, etc., accumulates on the bottom of the water, making the water surface shallower.In reservoirs, the amount of stored water decreases, and in sabo dams, sediment outflow cannot be prevented. In ports, problems such as shallow sea routes occur. For this purpose, dredging of sediment deposited on the water bottom is regularly performed.
[0003]
Particularly, in recent years, sludge and sludge (hereinafter, simply referred to as sludge) in which fallen leaves, dead branches, and the like have accumulated and decayed in addition to earth and sand in a reservoir have also been deposited.
[0004]
When dredging the sediment and sludge deposited on the bottom of the water, it is necessary to prevent the sediment water and sludge water in which the sediment and sludge are agitated by the dredging from flowing out around the dredging or downstream downstream of the basin.
[0005]
A dredging device that does not allow the earth and sand water or sludge water at the time of dredging to flow downstream is disclosed in, for example, JP-A-7-8998 and JP-A-2000-257108.
[0006]
In the dredging device disclosed in this publication, a cylindrical shielding tube that opens downward and closes the periphery is connected to the suction end of a suction hose extending from a tank that is suctioned by a vacuum pump. A nozzle for spraying high-pressure water supplied from a high-pressure water pump, or a stirring propeller is arranged inside the shielding cylinder, and the high-pressure water sprayed from the nozzle, or the stirring propeller, is provided inside the shielding cylinder. The sludge water obtained by stirring the accumulated sludge layer is sucked by the suction hose and transferred to a tank.
[0007]
In other words, the high-pressure water from the nozzle or the sludge water stirred by the stirring propeller is convected only in the shielding cylinder, and the sludge water is sucked by the vacuum pump and transferred to the storage tank, so that the water outside the shielding cylinder is removed. The agitation of the sludge and the spread of the agitation water and the outflow to the downstream are prevented.
[0008]
Further, the sludge water sucked and dredged by such a dredging apparatus is used for a sludge treatment apparatus for sludge sedimentation, dewatering and coagulation to be used for feed, fuel, forming material, and the like. 157899 and JP-A-2000-257108.
[0009]
[Problems to be solved by the invention]
When dredging sludge with fallen leaves, dead grass, and dead branches, etc., of the sediment deposited on the water bottom of a conventional reservoir, etc., in particular, a shielding cylinder is disposed on the sludge layer on the water bottom, and the shielding cylinder is disposed. A dredging device is used in which high-pressure water or sludge stirred by a stirring propeller is sucked by a vacuum pump and transferred to a sludge separation tank.
[0010]
This dredge device stirs the sludge only in the shielding cylinder, and sucks the stirring sludge water with a vacuum pump, so that the expansion of the stirring sludge water outside the shielding cylinder and the outflow to the downstream can be prevented. .
[0011]
When sucking sludge from a reservoir using such a dredging device, the sludge transfer distance from the sludge water suction location to the sludge water separation tank varies from a relatively short distance to a very long distance.
[0012]
On the other hand, the suction height of the vacuum pump is limited to about 10 m from the water surface, and practically about 3 to 4 m. If the transfer distance from the suction position to the storage tank is long, the suction may not be able to be performed.
[0013]
For this purpose, the dredger transports the sludge water of the shielding cylinder, the injection high-pressure water pump, the vacuum pump for sucking sludge water, the sludge water temporary storage tank, and the sludge water temporary storage tank to the sludge separation tank on the ground. It is necessary to provide a large dredger equipped with a transfer pump and the like, and a treatment facility for dredged sludge on the ground, and the power for driving the large dredger and the treatment facility needs to be generated by a drive device such as a turbine or diesel. .
[0014]
It is economically feasible to permanently install such a large-scale dredging and treatment facility along the coast of a reservoir, such as a dam, for dredging work to be performed once every trillion years, such as several years or ten years. In addition to being unreasonable, environmental pollution due to the driving device is a problem.
[0015]
The present invention provides a dredging pump capable of reliably dredging a sediment without diffusing sediment agitation water around or downstream of a dredging site and conveying the dredged sediment agitation water at a relatively long distance. The objective is to provide a dredging system that is easy to install even in mountainous areas and is environmentally friendly.
[0016]
[Means for Solving the Problems]
The pumping device for dredging of the present invention includes a jet pump for sucking and discharging sludge on the bottom of water by high-pressure jet water, a discharge pipe connected to a discharge port of the jet pump, and the jet pump connected to the discharge pipe. At the center portion, only a surface that comes into contact with the water bottom surface on the suction port side of the jet pump is opened, and a cylindrical suction restricting cylinder that surrounds the periphery of the jet pump and regulates a suction range of the water surface. The jet pump is used to dredge the water bottom while bringing the opening of the suction control cylinder into contact with the water bottom.
[0017]
The suction control cylinder of the dredging pump device of the present invention has a double structure including an inner suction control cylinder and an outer suction control cylinder, and the jet pump is provided substantially at the center of the inner suction control cylinder. And
[0018]
A plurality of openings communicating between the inside of the inside suction regulation tube and the inside of the outside suction regulation tube are provided on the upper part of the inside of the suction regulation tube of the suction regulation tube of the pumping device for dredging of the present invention. .
[0019]
Further, the opening position of the suction regulating cylinder of the pumping device for dredging of the present invention, and the opening position of the inner suction regulating cylinder of the double structure project more toward the water bottom than the suction port position of the jet pump. Further, the opening position of the outer suction regulating cylinder of the double structure is characterized by projecting more toward the water surface than the opening position of the inner suction regulating cylinder of the double structure.
[0020]
The pump for dredging of the present invention can agitate and suck only the sediment in the suction control cylinder with the jet pump, and prevent the sediment outside the suction control cylinder from being agitated, preventing the dredged sludge from spreading and flowing downstream. As well as being able to transport sediment over long distances.
[0021]
Further, the dredging system of the present invention includes a dredging means for dredging and sucking the sludge water on the water bottom, a sludge sedimentation means for storing the sludge water dredged and sucked by the dredging means and sedimenting and separating the sludge, and the sludge sedimentation means. Using sludge precipitated and separated in, methane gas purification means for purifying methane gas, and fuel cell means for driving a fuel cell using methane gas purified by the methane gas purification means to generate electric power, The electric power generated by the fuel cell means drives the dredging means, sludge sedimentation means, methane gas purification means and the like.
[0022]
The dredging means of the dredging system according to the present invention is characterized in that it has a jet pump and a cylindrical suction restricting cylinder which surrounds the jet pump and regulates a dredging range on the water bottom.
[0023]
The dredging system of the present invention can use the dredged sludge to generate fuel for a fuel cell, and use the power of the fuel cell to drive a dredged pump and other dredged sediment recycling processes. It has become possible to provide an environmentally friendly dredging system that is used as a simple and easy to assemble and install.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A pump device for dredging according to the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a configuration of an embodiment of a dredging pump device according to the present invention, FIG. 2 is a cross-sectional view showing a configuration of another embodiment of a dredging pump device according to the present invention, and FIG. FIG. 5 is a cross-sectional view illustrating the operation principle of a jet pump used in the dredging pump device of FIG.
[0025]
First, the configuration of the jet pump will be described with reference to FIG. The jet pump 41 is also called an injection pump or a jet pump, and is a pump that takes out another fluid by the fluid that is jetted.
[0026]
The jet pump 41 includes a cylindrical suction pipe 45 and a high-pressure jet pipe 43. A suction port 46 for sucking fluid is provided at one end of the cylindrical suction pipe 45, and a discharge port 47 is provided at the other end. The inner diameter of the suction pipe 45 is such that the inner diameter of the suction pipe 46 is gradually reduced from the end of the suction port 46 to a position approximately one third in the axial direction of the suction pipe 45, and the end of the discharge port 47. , A discharge path portion 47a whose inner diameter is gradually reduced from a position to a position approximately two-thirds in the axial direction of the suction pipe 45, and a negative pressure portion having a minimum inner diameter of a joint between the suction path portion 46a and the discharge path portion 47a. 48.
[0027]
A high-pressure jet pipe 43 connected to a high-pressure water supply pump 44 is disposed from a suction port 46 of the suction pipe 45 to a negative pressure section 48, and the high-pressure jet pipe 43 at the tip of the high-pressure jet pipe 43 is disposed in the negative pressure section 48. A jet outlet 42 is arranged.
[0028]
That is, the high-pressure water A generated by the high-pressure water supply pump 44 is jetted from the high-pressure jet outlet 42 of the high-pressure jet pipe 43 to the negative pressure section 48. By the jet of the high-pressure water A from the high-pressure jet outlet 42, the air in the negative pressure portion 48 of the suction pipe 45 is induced to have a negative pressure, and the fluid B is sucked from the suction port 46 through the suction path 46a, and discharged. The high-pressure water A and the fluid B are discharged from the discharge port 47 via the portion 47a.
[0029]
As described above, a jet pump that suctions and discharges another fluid by high-pressure jet water without having a function of mechanically rotating or sliding movement is higher in suction discharge height and transfer distance than the above-described vacuum pump. Can be increased.
[0030]
Next, an embodiment of a dredging pump device of the present invention using such a jet pump 41 will be described with reference to FIG.
[0031]
A discharge pipe 49 is connected to a discharge port 47 of the jet pump 41. The discharge pipe 49 is for transferring high-pressure water sucked and discharged by the jet pump 41 and other fluid sucked by the high-pressure water, for example, sludge water including sludge on the water bottom surface.
[0032]
The jet pump 41 to which the discharge pipe 49 and the high-pressure jet pipe 43 are connected is disposed inside the cylindrical suction regulating cylinder 11. The suction control cylinder 11 has a circular or square cylindrical shape including an upper surface 11a and a side surface 11b, and has an opening 12 on the lower surface. An insertion hole for the discharge pipe 49 is provided at the center of the upper surface 11a of the suction control cylinder 11, and the jet pump 41 connected to the discharge pipe 49 is disposed at a substantially central portion inside the suction control cylinder 11. It has become. An elastic body 13 is attached to a tip of the side surface 11b of the suction regulating cylinder 11 on the opening 12 side. The elastic body 13 is provided to prevent abrasion of the tip of the side surface 11b due to soil and the like on the water bottom, to absorb shock when the water is lowered to the water bottom, and to prevent a gap between the water bottom and the suction control cylinder from being generated. Have been.
[0033]
In other words, the jet flow pump 41 is suspended and fixed by the discharge pipe 49 at a substantially central portion of the internal space of the suction control cylinder 11. The inner diameter of the suction control cylinder 11 is set to about 1 m in consideration of the topography of the water bottom surface and the suction and discharge capacity of the jet pump 41.
[0034]
As described above, the jet pump 41 disposed and fixed inside the suction control cylinder 11 lowers the opening 12 of the suction control cylinder 11 from the dredger provided in the reservoir or the like to the sludge layer 14 which is a sludge accumulation layer on the water bottom. .
[0035]
The opening 12 of the suction control cylinder 11 having the jet pump 41 descended to the sludge layer 14 is sunk inside the upper surface of the sludge layer 14 by the gravity of the jet pump 41 and the suction control cylinder 11. That is, the water and the sludge layer 14 are stored inside the suction control cylinder 11.
[0036]
When the jet pump 41 submerged in the upper part of the sludge layer 14 is driven, the sludge layer 14 inside the suction control cylinder 11 is sucked, and a suction sludge flow 46 is generated in the suction port 46 of the jet pump 41. A suction flow 15 of water and sludge is generated inside the suction control cylinder 11.
[0037]
That is, the jet flow pump 41 generates the suction flow 15 inside the suction control cylinder 11, and the water and the sludge are stirred and sucked as the suction sludge flow 16. Thereby, the water and the sludge layer 14 outside the suction control cylinder 11 are not stirred, and the flow of the stirred sludge to the area other than the dredging work area can be prevented.
[0038]
In this way, when the sludge on the water bottom is dredged by the dredging pump device in which the jet pump 41 is disposed inside the suction control cylinder 11, only the sludge inside the suction control cylinder 11 can be dredged. It is possible to prevent the sludge from being stirred and flowing out.
[0039]
However, the sludge layer 14 inside the suction control cylinder 11 is dredged, and the upper surface of the sludge layer 14 inside the suction control cylinder 11 becomes lower than the upper surface of the sludge layer 14 outside the suction control cylinder 11 (in the figure). When the suction pressure inside the suction control cylinder 11 increases, the contact pressure between the opening 12 and the sludge layer 14 outside the suction control cylinder 11 is weak, as indicated by the dotted arrow in the figure. Then, a suction sludge flow 16 ′ is generated and flows into the suction control cylinder 11. Due to the suction sludge flow 16 ′, a suction flow 15 ′ is generated outside the suction control cylinder 11, which may agitate the sludge layer 14 outside the suction control cylinder 11.
[0040]
Such internal suction pressure of the suction control cylinder 11 becomes high, and the possibility of stirring the sludge layer 14 on the outer periphery of the suction control cylinder 11 from a portion where the contact pressure resistance between the opening 12 of the suction control cylinder 11 and the sludge layer 14 is weak is eliminated. Another embodiment of the pumping device for dredging according to the present invention will be described with reference to FIG.
[0041]
The jet pump 41 to which the discharge pipe 49 and the high-pressure jet pipe 43 are connected is disposed inside the cylindrical inner suction regulating cylinder 21. The inner suction regulating cylinder 21 has a circular or square cylindrical shape having an upper surface 21a and a side surface 21b, and has an opening 22 on the lower surface. An insertion hole for the discharge pipe 49 is provided in the center of the upper surface 21a of the inner suction control cylinder 21, and a jet pump 41 connected to the discharge pipe 49 is disposed at a substantially central portion inside the inner suction control cylinder 21. It is supposed to be.
[0042]
An outer suction regulating cylinder 23 having a similar shape to the inner suction regulating cylinder 21 is provided on the outer periphery of the side surface 21b of the inner suction regulating cylinder 21. The outer suction regulating cylinder 23 has an upper surface 23a joined to the upper end of the side surface 21b of the inner suction regulating cylinder 21 and a side surface 23b parallel to the side surface 21b of the inner suction regulating cylinder 21. Have.
[0043]
A plurality of upper openings 25 communicating with the insides of the inner suction regulating cylinder 21 and the outer suction regulating cylinder 23 are provided above the side surface 21b of the inner suction regulating cylinder 21.
[0044]
The opening 22 of the inner suction restricting cylinder 21 extends from the suction port 46 of the jet pump 41 to the dimension t1 on the bottom surface side, and the opening 24 of the outer suction restricting cylinder 23 receives the suction of the jet pump 41. The opening 46 of the inner suction regulating cylinder 21 has a dimension t2 extending from the opening 46 to the water bottom side with respect to the opening position dimension t1. In other words, the position dimension t2 of the opening 24 of the outer suction regulating cylinder 23 extends toward the water bottom side from the position dimension t1 of the opening 22 of the inner suction regulating cylinder 21 (t1 <t2).
[0045]
That is, around the jet pump 41, a double suction regulating cylinder composed of the inner suction regulating cylinder 21 and the outer suction regulating cylinder 23 is arranged, and the inner suction regulating cylinder 21 and the outer suction regulating cylinder of the double suction regulating cylinder are arranged. The inside of 23 is inserted through an upper opening 25, and the positions of the openings 22, 24 on the lower surfaces of the inner suction regulating cylinder 21 and the outer suction regulating cylinder 23 are such that the outer suction regulating cylinder 23 is located on the water bottom side. Is formed.
[0046]
An elastic body 13 is attached to the inner suction restricting cylinder 21 and the outer suction restricting cylinder 23 at the ends of the side surfaces 21b, 23b on the opening 22, 24 side. The elastic body 13 is provided to prevent wear of the tips of the side surfaces 21b and 23b due to earth and sand on the water bottom and to absorb impact when the water is lowered to the water bottom.
[0047]
The inner diameter of the outer suction regulating cylinder 23 is, for example, about 1.5 times (inner diameter of the inner suction regulating cylinder 21) the inner diameter of the outer suction regulating cylinder 23, depending on the suction and discharge capacity of the jet pump 41. × 1.5 = the inner diameter of the outer suction regulating cylinder 23).
[0048]
Further, a wire mesh or the like may be disposed in the upper opening 25 so that dust or the like in the outer suction regulating cylinder 23 does not flow into the inner suction regulating cylinder 21.
[0049]
The jet pump 41 whose periphery is surrounded by the double suction regulating cylinders 21 and 23 is lowered to the sludge layer 14 which is a sludge accumulation layer on the water bottom, and high-pressure water is supplied from a high-pressure jet pipe 43 to jet the jet. When the pump 41 is driven, the suction sludge flow 16 including the sludge layer 14 of the inner suction control cylinder 21 is sucked, and the suction flow 15 is generated.
[0050]
By the suction flow 15 inside the inner suction regulating tube 21, water inside the external suction regulating tube 23 is sucked into the internal suction regulating tube 21 via the upper opening 25. Further, the sludge layer 14 inside the external suction control cylinder 23 is sucked as sludge suction flow 27 from a portion where the contact pressure resistance between the opening 22 of the internal suction control cylinder 21 and the sludge layer 14 is weak, and the inside of the external suction control cylinder 23 Generates a suction flow 26.
[0051]
In other words, by the driving of the jet pump 41, the suction flow is generated by the suction sludge flow 16 in the inner suction restriction cylinder 21 to generate the suction flow 15, and the suction flow 26 is generated in the outer suction restriction cylinder 23, thereby controlling the inner suction restriction. The suction flow 15 in the cylinder 21 is reduced.
[0052]
Further, when the sludge layer 14 inside the internal suction regulating cylinder 21 is dredged and a portion where the contact pressure resistance between the opening 22 of the internal suction regulating cylinder 21 and the sludge layer 14 is weak occurs, the inside from the opening 24 of the external suction regulating cylinder 23 enters. A suction sludge flow 27 into the suction control cylinder 21 is generated.
[0053]
When the suction pressure is reduced by the suction flows 15 and 26 and the suction sludge flows 16 and 27 inside the internal suction control cylinder 21 and the external suction control cylinder 23, the opening 24 of the outer suction control cylinder 23 and the sludge layer 14 are connected. The suction sludge flow 28 from the joint portion is less likely to occur. Therefore, sludge agitated flow does not occur on the outer peripheral side of the outer suction regulating cylinder 23, and it is possible to prevent sludge from spreading to places other than the dredging place.
[0054]
As described above, the dredging pump device of the present invention is provided with a single or double suction control cylinder around the jet pump, and sucks water and sludge inside the suction control cylinder, thereby forming the suction control cylinder. Sludge agitation and sludge diffusion and outflow around the outside can be minimized, and sludge water can be transported over a long distance.
[0055]
Next, the dredging system of the present invention will be described with reference to FIG. In this dredging system, for example, a sediment layer 53 deposited on the bottom of a reservoir formed by damming a river in a mountain area with a dam 51, and fallen leaves and dead branches in a river or a reservoir basin are formed by decay. Optimum for dredging the sludge sedimentary layer 52, which is sludge, is easy to move and assemble to the dredging place, and does not harm the environment.
[0056]
Generally, the dam 51 is provided with a sand discharging valve 54, and the sediment carried from the upstream of the river and deposited as a sediment deposited layer on the bottom of the reservoir is operated below the dam 51 by operating the sand discharging bubble 54. It is designed to discharge into the basin. However, on the upper surface of the sedimentary sedimentary layer 53 on the bottom surface of the reservoir, sludge sedimentary layer 52 of sludge generated by decay of fallen leaves, dead grass, dead branches, etc. is formed. For this reason, when the sand discharging valve 54 is operated, sludge is discharged to the downstream along with the earth and sand, thereby contaminating the water in the downstream area.
[0057]
In addition, if the dredging equipment and the dredged material processing system are permanently installed at the dredging site, it will be necessary to secure the installation location of the dredging equipment during the construction of dams and to maintain and manage the dredging equipment that is used once every year. It is complicated.
[0058]
Therefore, the dredging system of the present invention can be easily assembled and installed at a dredging place, generates methane gas using sludge as the dredged sludge, drives a fuel cell with the methane gas, and drives necessary for dredging work. It does not cause environmental destruction that makes it possible to obtain dynamic power.
[0059]
On the surface of the river water 50 in the reservoir formed by the dam 51, a barge 55 for dredging is floated, and the barge 55 is provided with the high-pressure water supply pump 44, the jet pump 41, and the GPS device 56. Have been. The high-pressure water supply pump 44 pressurizes high-pressure water that takes in river water 50 and causes the jet pump 41 to supply and jet the river water. The jet pump 41 descends from the barge 55 to the sludge deposit layer 52 on the bottom of the water, and the high pressure water from the high pressure water supply pump 44 suction-dredges the sludge deposit layer 52. The GPS device 56 is a position detecting device for measuring the position of the barge 55, that is, the dredging position by the jet pump 41.
[0060]
Sludge water 75 composed of sludge and water sucked and dredged by the jet pump 41 is transferred from the barge 55 to a sludge treatment facility provided along the shore of the reservoir by a transfer pipe.
[0061]
This sludge treatment facility stores a sludge sediment tank 58 for storing sludge water 75 suctioned and dredged by the jet pump 41 of the stool 55 to separate sludge from water, and a dewatering process for sludge sedimented and separated by the sludge sedimentation tank 58. Then, a dehydrator 64 for producing sludge solidified into a cake type, a bioreactor-type methane gas generator 67 for producing methane gas from sludge dehydrated and solidified by the dehydrator 64, and a methane gas generator 67 The fuel cell system includes a methane gas storage tank 68 for storing methane gas, and a fuel cell 73 for reforming methane gas from the methane gas storage tank 68 and driving the fuel cell using the reformed methane gas as fuel to generate electric power.
[0062]
The sludge sedimentation tank 58 stores sludge water 75 from the jet pump 41 to sediment sludge and separates supernatant water after sludge sedimentation into an overflow water tank 59. The supernatant water stored in the overflow water tank 59 is drained to a purified water purification tank 61 via a valve 60.
[0063]
In this water purification tank 61, the supernatant water from the overflow water tank 59 of the sludge sedimentation tank 58 is purified with oxygen only 62, and the purified supernatant water is drained to a river. .
[0064]
The sludge sedimented and separated in the sludge sedimentation tank 58 is sucked by the slurry pump 63 and transported to the dewatering device 64. The dewatering device 64 dewaters and removes excess water from the sludge, and solidifies the dewatered sludge into a cake type. The water dehydrated by the dehydrator 64 is drained to the purified water purification tank 61 via a valve 66.
[0065]
The sludge dehydrated by the dehydrator 64 is conveyed by a cake transport screw pump 65 to a methane gas generator 67 of a bioreactor.
[0066]
In the methane gas generator 67, the solidified sludge is subjected to fermentation by applying the temperature of oxygen and predetermined hot water to generate methane gas. The methane gas generated by the methane gas generator 67 is supplied and accumulated in a methane gas storage tank 68.
[0067]
The methane gas for fuel is supplied from the methane gas storage tank 68 to the reforming burner 71 of the methane gas reformer 70 via a valve 69, and the methane gas for reforming is supplied to the methane gas reformer 70 via a valve 72. Hot water obtained by heating the methane gas generator 67 to a predetermined temperature is supplied to the methane gas reformer 70 via a valve 78.
[0068]
That is, in the methane gas reformer 70, the reforming methane gas is purified into hydrogen as the reforming gas by the fuel methane gas heated by the predetermined hot water and burned by the reforming burner 71.
[0069]
The hydrogen of the reformed gas is combined with hydrogen purified by a hydrogen / oxygen generator 75 that decomposes hydrogen and oxygen from water and supplied as fuel for the fuel cell 73.
[0070]
The oxygen decomposed and purified by the hydrogen / oxygen generator 75 is compressed by a compressor 76 and supplied to an oxygen storage 62 of the purified water purification tank 61 via a valve 80 and to a methane gas generator 67 via a valve 79. It has become so.
[0071]
The fuel cell 73 generates and stores electric power using the hydrogen as a fuel, draws hot water generated by burning the hydrogen with a pump 74, and supplies the hot water to the methane gas generator 67 as hot water. I have.
[0072]
The electric power generated and stored in the fuel cell 73 is converted into a predetermined electric power by a power supply control device 81, and the high-pressure water supply pump 44, the slurry pump 63, the dewatering device 64, the cake transport screw pump 65, the hot water pump 74 , A hydrogen / oxygen generator 75, a compressor 76, and other control facilities.
[0073]
Further, the combo st after purifying the methane gas from the sludge of the methane gas generator 67 is processed as an agricultural fertilizer.
[0074]
That is, after the dredged and sucked sludge is dehydrated and solidified from the bottom of the water using the suction control cylinder 11, which is a dredging pump device, or the jet pump 41 having 21, 23, the sludge is subjected to methane gas generation under predetermined conditions. A dredging system that drives a fuel cell based on the methane gas and uses the electric power generated by the fuel cell to drive the dredging pump, sludge dewatering device, methane gas purification device, and the like.
[0075]
In this dredging system, a high-pressure water supply pump 44, a dredging pump device having a jet pump 41 having a suction regulating cylinder, and a sludge flow transfer pipe for transferring a sucked sludge flow are provided on a barge 55 on a water storage surface. ing. A sludge sedimentation tank for sedimenting and separating sludge from sludge water transferred by the sludge flow transfer pipe of the barge 55, a methane gas device for purifying methane gas from the separated sludge, and power generation using the purified methane gas A dredging system can be easily constructed by providing a fuel cell that operates along the shore of the reservoir.
[0076]
With this dredging system, it is possible to generate the necessary power for the contact system using the dredged sludge, and it has become possible to construct and drive a system that is less likely to reuse energy and cause environmental destruction.
[0077]
【The invention's effect】
The pump device for dredging of the present invention, by surrounding the periphery of the jet pump by the suction control cylinder, can suction the sludge layer only in the suction control cylinder, can prevent the sludge diffusion outside the suction control cylinder, and, The use of the jet pump has the effect that the distance of suction and discharge can be increased.
[0078]
Further, the dredging system of the present invention uses the dredged sludge to purify methane gas, drives a fuel cell with the methane gas, and drives various devices constituting the dredging system with the electric power of the fuel cell to save energy. It has the effect of hardly causing reuse and environmental destruction.
[Brief description of the drawings]
FIG. 1 is a sectional view showing the configuration of an embodiment of a dredge pump device according to the present invention.
FIG. 2 is a cross-sectional view showing the configuration of another embodiment of the dredging pump device according to the present invention.
FIG. 3 is a block diagram illustrating a configuration of an embodiment of a dredging system according to the present invention.
FIG. 4 is a cross-sectional view illustrating the operation principle of a jet pump used in the dredging pump device according to the present invention.
[Explanation of symbols]
11 ... Suction restriction cylinder
12 ... Opening
13 ... elastic body
14 ... Sludge layer
15 ... Suction flow
16 ... Suction sludge flow
41… jet pump
43… High pressure jet pipe
46 ... Suction port
49… Discharge pipe

Claims (6)

A jet pump that sucks and discharges sludge on the bottom of the water by high-pressure jet water,
A discharge pipe connected to a discharge port of the jet pump,
The jet pump connected to the discharge pipe is provided substantially at the center, and only the surface that comes into contact with the water bottom surface on the suction port side of the jet pump is open, and the suction area of the water bottom surrounds the periphery of the jet pump. A cylindrical suction regulating cylinder that regulates
A dredging pump device, characterized in that the jet pump drives the water bottom while the opening of the suction regulating cylinder is in contact with the water bottom. 2. The suction control cylinder according to claim 1, wherein the suction control cylinder has a double structure including an inner suction restriction cylinder and an outer suction restriction cylinder, and the jet pump is provided substantially at the center of the inner suction restriction cylinder. 3. Pumping equipment for dredging. The dredging device according to claim 2, wherein a plurality of openings communicating between the inside of the inner suction regulating tube and the inside of the outer suction regulating tube are provided at an upper portion of the inner suction regulating tube of the suction regulating tube. For pumping equipment. The opening position of the suction restricting cylinder and the opening position of the inner suction restricting cylinder of the double structure project more toward the water bottom than the position of the suction port of the jet pump. 4. The dredging pump device according to claim 1, wherein an opening position of the regulating cylinder projects more toward a water surface side than an opening position of the inner suction regulating cylinder of the double structure. 5. Dredging means for dredging and sucking sludge water on the water bottom,
Sludge sedimentation means for storing sludge water dredged and sucked by the dredging means, and sedimenting and separating sludge,
Using sludge precipitated and separated by the sludge sedimentation means, methane gas purification means for purifying methane gas,
A fuel cell unit that drives a fuel cell using the methane gas purified by the methane gas purification unit to generate electric power,
A dredging system, wherein the dredging means, the sludge sedimentation means, the methane gas purification means and the like are driven by the electric power generated by the fuel cell means. The dredging system according to claim 5, wherein the dredging means has a jet pump and a cylindrical suction regulating cylinder surrounding the jet pump and regulating a dredging range on a water surface.

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