CN100464027C

CN100464027C - Method for the removal of sediment from sand traps

Info

Publication number: CN100464027C
Application number: CNB028092015A
Authority: CN
Inventors: 汤姆·雅各布森
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-02
Filing date: 2002-04-24
Publication date: 2009-02-25
Anticipated expiration: 2022-04-24
Also published as: JP4412700B2; NO20012153D0; JP2004524467A; NO316628B1; WO2002088472A1; CN1505722A; NO20012153L

Abstract

Method for hydraulic removal of sediment from a sand trap, said sediment constituting particles varying in size from rocks to fine-grain particles, where the sediment is sucked into a substantially horizontally or inclined slotted pipe (4) through at least one slot (9) that extends substantially uninterrupted over a significant part of the length of the slotted pipe (4), from which slotted pipe (4) the sediment is directed out from the sand trap (1) through an outlet (5). The sand trap (1) is provided with a longitudinally extending ditch (2) at its bottom (3), the ditch being substantially more narrow than the sand trap, and the slotted pipe (4) being arranged close to the bottom of the ditch (2). The pressure differential between the sand trap (1) and outlet (5) is normally utilized as the only driving force for the removal of sediment. The amount of sediment to be removed may in addition be controlled by addition of water (12) downstream of the slot (9).

Description

Be used for removing sedimental method from sand trap well

Technical field

The present invention relates to a kind of being used for removes sedimental method from sand trap well.

Background technology

Under many circumstances, hope can be removed the underwater sediment(s) of precipitation, and the while does not need the water above the venting or reduces the height of water.Deposit can be a particle, as gravel, sand, mud, organic granular or other particle.The water that flows in river, canal, tunnel or pipe can be loaded with deposit.When flow velocity reduces, the deposit heavier than water will sink to bottom and precipitation.This can with power station or irrigation station, reservoir that sand trap well is relevant, enter in pond or the sedimentation basin and carry out, perhaps in the tunnel relevant, groove or pond, carry out with treatment plant.Usually wish to utilize water or air to come the storage tank of emptying certain material.In the following description, for simply, no matter their purposes how, all deposit ponds all are expressed as sand trap well.

In the power station, if allow deposit flow through turbine with water, this deposit may cause very galling.Know that because sedimental wearing and tearing, the turbine in some power station need be repaired or change repeatedly in 1 year.And canal and tunnel may be full of deposit.Therefore, sand trap well usually and the power station be arranged together, particularly will have a large amount of sedimental zones in the river.And, wish it and irrigation station usually together, so that can separate bigger at least particulate fraction at the water inlet place at this station, therefore, irrigating the canal can be not blocked, irrigation station can not spray chiltern water.

The sedimental scope that in sand trap well, precipitates for from rock and gravel until very tiny particle.In the power station, the generally held standard of the particle size of separation is to 0.5mm from 0.15.

Remove sedimental known technology and comprise draining and take, perhaps the water flow velocity on the deposit is increased, thereby wash by reducing water level with machinery.The shortcoming of these two kinds of methods is for example to supply with that the water in power station will interrupt.Therefore with breaks in production, and also need in addition with the power station stop and starting relevant cost.

And, produce and remove conflict between the deposit in hope and will cause removing sedimental operation usually and postpone and carrying out, thereby cause increasing the turbine wearing and tearing.

Other technology comprises that flushing leads to the through hole that washes conduit in sand trap well bottom.These holes selectively are provided with closing organ (system that the patent of Bieri proposes).The shortcoming of this system is motor, transmission device and the movable part that need be able to be used for shutting down.

SINTEF, Trondheim have developed the another system that is called " snakelike deposit launder system ".The system is characterized in that at the vertical slit of flushing above the conduit and temporarily close by flexible hose.This flexible pipe can emptying or is full of water, and will open or close this flushing conduit respectively when it floats or avales.The shortcoming of this method comprises that the cost of flexible pipe is higher, is subject to foreign substance and damages, and complicated operation.

The front is by the agency of, have vertically in the bottom side and at least the pipe of the slit of partial continuous be applicable to the suction deposit and obtain high as far as possible deposit concentration, do not have the danger that deposit stops up the output of pipe, flexible pipe or conduit simultaneously.The deposit of suction will be the deposit that is deposited on this pipe that slit is arranged.This pipe that slit is arranged is at Gemina, and No3 introduces among in December, 1994 p20-21 (being published by SINTEF/NTNU).The shortcoming of the method for this known pipe that slit is arranged is to compare lowly with length of tube when the sedimental bed thickness on pipe, and deposit will aspirate at a far point, be not the deposit of removing as desired on the whole pipe.

Summary of the invention

The purpose of this invention is to provide a kind of being used for removes sedimental method from other position that sand trap well and deposit precipitate.Another purpose is to remove this deposit before sand trap well is full of deposit fully, wherein, and the supply of cutting off the water supply in not needing, and running out of flushing water may be low.

Another purpose is that method of the present invention can be carried out with inexpensive manner, and makes the personnel of this method of execution not need to carry out skill learning and long-time training.

Another purpose of the present invention is to regulate deposit concentration, so that optimize this concentration according to water level in sand trap well and sedimental character.

Another purpose is to make this method reliable, and required maintenance is less.

These purposes realize by method provided by the invention.A kind of being used for utilizes fluid power to remove sedimental method from sand trap well, described deposit is made of the particle of the various sizes from the rock to the fine particle, wherein, deposit is inhaled in the pipe that slit is arranged of a substantial horizontal or inclination by at least one slit, this at least one slit extends on this has most of length of pipe of slit basically incessantly, by this pipe of slit is arranged, deposit is drawn from sand trap well by outlet; It is characterized in that: described sand trap well is provided with the irrigation canals and ditches of longitudinal extension in its bottom, and these irrigation canals and ditches are narrower than sand trap well basically, and the described pipe that slit arranged is arranged to the bottom near irrigation canals and ditches.

Description of drawings

Introduce the present invention below with reference to the accompanying drawings in detail

Fig. 1 is the sectional side elevation that adopts the sand trap well of method of the present invention;

Fig. 2 is the cross-sectional figure of the sand trap well of Fig. 1;

Fig. 3 is the sectional side elevation of sand trap well that adopts the method for optional embodiment of the present invention; And

Fig. 4 is the sectional side elevation of the sand trap well of further embodiment of this invention.

The specific embodiment

Fig. 1 has represented the sectional side elevation of sand trap well 1, and this sand trap well 1 is the narrow irrigation canals and ditches 2 in bottom 3 only.Have the pipe 4 of slit to be arranged in these irrigation canals and ditches 2, this has the pipe 4 of slit at one end to have outlet 5, and has the opposite end 6 of rising.Valve 8 near described outlet can open and close, so that regulate the operation of this pipe that slit is arranged 4.Also shown supplying duct 12 among the figure,, can add water to pipe 4 from sedimental downstream by this supplying duct 12 by valve 13 is opened to a certain degree.

Fig. 2 has represented the cross-sectional figure of the sand trap well shown in Fig. 1.On narrow irrigation canals and ditches 2, arranged grid 7 or similar item, with prevent larger object for example branch etc. fall into this narrow irrigation canals and ditches.

Fig. 2 has represented two pipes that slit is arranged, and these two Guan Yiyi the modes on another are arranged in the irrigation canals and ditches 2.These pipes both can use simultaneously with the increase ability, also can be the standby pipes of the second effective work when first pipe loses function.Fig. 2 has represented that also the bottom 3 of sand trap well is downward-sloping towards these irrigation canals and ditches 2, and this constitutes the preferred embodiments of the present invention.

Fig. 3 has represented to have in its termination the pipe that slit is arranged 4 of outlet 5,5 ', and therefore, sand trap well can be alternately with the two lines emptying.This pipe that slit arranged is located to be increased at each end 6,6 ' and is higher than sedimental upper height, and it can be by valve 11,11 ' sealing.

Fig. 4 has represented the sand trap well that several sections ground separates, and these sand trap wells have the independent pipe that slit is arranged.This has represented the method when sand trap well has large-size, particularly when wishing that sand trap well is not made very deeply.And, by utilizing a plurality of pipes that slit is arranged, can improve the reliability of work.

Design is covered the pipe that guarantees the to have slit whole length along it by deposit.This need obtain to make pipe to aspirate sedimental fluid power condition along its whole length (not only at far point).By the same token, preferably operate at certain intervals.The pipe that slit arranged is operated by opening near its valve of outlet usually, and can increase suction in the pipe by operating one or more pumps simultaneously.

According to the usable floor area and the size of sand trap well, the size of irrigation canals and ditches can change in wide range.Usually, width can from 0.25 to 1 meter, from 1 to 5 meter usually of the degree of depth.Have slit pipe size with need adapt.

Preferably, there is the upstream extremity of the pipe of slit to be increased to and is higher than sedimental height.Therefore, will guarantee that starting point is higher than all precipitation deposits.

Usually preferably utilize the water level in sand trap well and export difference in height between 5 as the driving force that deposit is sucked in the pipe 4 that slit is arranged.By utilizing this height or pressure differential, can improve the reliability of work, even because when power failure, also can work on.In addition, outlet can be designed to smooth fully, and this has reduced the danger of stopping up.Can use one or more pumps, so that obtain higher driving force.From sand trap well, aspirate the required pressure differential of shaking out and be generally 1-10 rice.

There is the pipe of slit to be suitable for transmitting particle up to certain size.Therefore, the particle of preferably collecting in irrigation canals and ditches is no more than this size.Therefore, preferably on the major part or whole length of these irrigation canals and ditches, be coated with grid at the top of these irrigation canals and ditches, this grid will block size greater than a particle that delimits.

In order to prevent thrashing, arrange in identical irrigation canals and ditches that preferably two or more have the pipe of slit.When a pipe plug plug, can there be the pipe of slit to continue this operation by another.When situation needs, can operate a plurality of pipes simultaneously so that for example rise or other extreme case under the increase ability.

For the deposit concentration in the volume that can be controlled at outlet 5, preferably the downstream at the pipe that slit is arranged has the pipe of slit to supply water to this.Deposit concentration in the exit is controlled by the amount of the water of interpolation.

Although all deposit is all only derived along a direction usually, preferably also can guide deposit along the optional direction of the pipe that slit is arranged.In order to realize this function, must form the system shown in Fig. 3, wherein, there are the two ends of the pipe of slit to link to each other with 6 with the tube portion 6 ' that raises respectively, and link to each other with 5 ' with outlet at bottom 5 respectively.By valve and by cooperating, determine the direction of deposit suction with suitable " drive source ".

Although above-mentioned explanation relates to sand trap well (this is prevailing situation), should be known in that the present invention also can be used for the situation that surrounding fluid is not a water, for example be oil or gas.

Claims

1. one kind is used for utilizing fluid power to remove sedimental method from sand trap well, described deposit is made of the particle of the various sizes from the rock to the fine particle, wherein, deposit is inhaled in the pipe that slit is arranged (4) of a level or inclination by at least one slit (9), this at least one slit (9) extends on this has most of length of pipe (4) of slit, by this pipe (4) of slit is arranged, deposit is drawn from sand trap well (1) by outlet (5);

It is characterized in that: described sand trap well (1) is provided with the irrigation canals and ditches (2) of longitudinal extension in its bottom (3), and these irrigation canals and ditches (2) are narrower than sand trap well, and the described pipe (4) that slit arranged is arranged to the bottom near irrigation canals and ditches (2).

2. method according to claim 1 is characterized in that:

Pressure differential between sand trap well (1) and outlet (5) is as the sedimental driving force of suction, and the starting point of suction and process are by valve (8) control near outlet (5).

3. method according to claim 1 is characterized in that:

Driving force is provided by one or more pumps at least in part.

4. method according to claim 1 is characterized in that:

The bottom (3) of described sand trap well (1) is transversely downward-sloping towards described irrigation canals and ditches at it.

5. method according to claim 1 is characterized in that:

Deposit has this pipe that slit is arranged (4) that is pumped in of the pipe (4) of slit to be begun to carry out afterwards by the deposit covering fully by described.

6. method according to claim 1 is characterized in that:

The sedimental amount of suction is controlled by the interpolation water at the downstream part of slit.

7. method according to claim 1 is characterized in that:

Described have the termination (6) relative with outlet (5) of the pipe (4) of slit to be raised, thereby it is higher than the deposit of precipitation.

8. method according to claim 1 is characterized in that:

Grid (7) be arranged in described narrow irrigation canals and ditches above, concentrate in the irrigation canals and ditches (2) to prevent off size suitable object.

9. method according to claim 1 is characterized in that:

A plurality of Guan Yiyi that slit arranged on another mode and/or side by side mode arrange near the bottom of described irrigation canals and ditches.

10. method according to claim 1 is characterized in that:

The described pipe (4) that slit arranged has respectively described outlet (5) and another outlet (5 ') at its two ends, and be connected with pipe end (6,6 ') respectively at two ends, wherein, described pipe end is arranged to make their upper end to be higher than deposit at any time, and have slit (9), and can close by valve (11,11 ') respectively to small part along the bottom.

11. method according to claim 1 is characterized in that:

Described have the pipe (4) of slit to be arranged in several sand trap wells that separate at least in part (1,1 '), and these sand trap wells are one another in series or are arranged in parallel.