A geotextile tube multi-stage intelligent dewatering system and method

Abstract

The application discloses a kind of geotechnical pipe bag multistage intelligent dehydration systems, including pretreatment and conditioning concentration system, medium-pressure filter pressing concentration system, modified conditioning dosing system, efficient dehydration system in turn, the pretreatment and conditioning concentration system includes feed pump, vibrating screen, homogenizing tank, the slurry is lifted to vibrating screen after removing large particles by feed pump and enters homogenizing tank;Flocculating agent is added to homogenizing tank by pipeline mixer, slurry detection module is arranged in the homogenizing tank, and the concentration of slurry is detected in real time;The medium-pressure filter pressing concentration system includes a plurality of geotechnical pipe bags and the punching pipe of being set at the feed inlet of geotechnical pipe bag, the discharge sleeve of being set at the discharge port of geotechnical pipe bag, and the slurry pretreated via homogenizing tank is pumped into the geotechnical pipe bag;The application solves the situation that processing speed is relatively slow in the conventional geotechnical pipe bag dehydration process, especially for fine particle silt, has good dehydration effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of geotextile tube dewatering. More particularly, the present application relates to a geotextile tube multi-stage intelligent dewatering system and method. BACKGROUND

[0002] In dredging and water environment management projects, sludge dewatering technology has been widely applied, especially in ecological dredging projects. In order to reduce the stress pressure of spatial transfer of contaminated sediment on environmental capacity, various sludge dewatering technologies are used in practical engineering. These technologies include mechanical dewatering technology (such as centrifugal dewatering, belt filter dewatering, plate and frame filter dewatering), shallow vacuum preloading dewatering technology, fabric filtration technology, etc. Although geotextile tube dewatering technology has certain advantages as a method applied to dredged sludge drying treatment, it also has limitations in terms of processing efficiency.

[0003] Although geotextile tube dewatering technology has fast construction speed and energy saving, it also has some limitations, mainly including limited processing speed, limited single processing capacity due to filling height limitation, need for pretreatment to increase steps, intermittent operation to prolong processing time, influence of environmental conditions, maintenance requirements, influence of sludge property fluctuations on efficiency, limited large-scale processing capacity, subsequent processing requirements, low automation level, and site restrictions, etc.

[0004] Geotextile tube dewatering technology relies on natural filtration and seepage processes, limiting overall processing speed, especially when the sludge concentration is high or contains a large amount of fine particulate matter. By optimizing geotextile tube design and processing technology, the limitations of geotextile tube dewatering efficiency can be improved, and its processing efficiency can be improved.

[0005] In the practical application of geotextile tube dewatering, the clogging of the permeable cloth has always been a difficult problem. The main problem is that fine particles are closely arranged at the drainage passage of the permeable cloth, forming a dense "mud skin layer", making it difficult for water to drain. As the thickness of the closely arranged fine particles increases, it becomes more and more difficult for water to drain, and eventually fails. The technical personnel in this field have long been committed to researching low-cost, high-efficiency, intelligent sludge dewatering equipment and technology. SUMMARY

[0006] In order to achieve these objects and other advantages of the present application, a preferred embodiment of the present application provides a geotextile tube multi-stage intelligent dewatering system, which comprises a pretreatment and conditioning concentration system, a medium-pressure filter concentration system, a modified conditioning and dosing system, and a high-efficiency dewatering system in sequence,

[0007] The pretreatment and conditioning concentration system comprises a feed pump, a vibrating screen, and a homogenizing tank. The slurry is lifted by the feed pump to the vibrating screen to remove large particles and then enters the homogenizing tank. A flocculating agent is added to the homogenizing tank through a pipeline mixer.

[0008] The medium-pressure filter concentration system comprises a plurality of concentrated geotextile tubes and a perforated pipe sleeved at the feed inlet of the concentrated geotextile tube, and a discharge sleeve sleeved at the discharge outlet of the concentrated geotextile tube; the slurry pretreated via the homogenizing tank is pumped into the geotextile tube;

[0009] The modified conditioning and dosing system comprises a modified conditioning tank and a stirring motor installed in the modified conditioning tank; the slurry in the concentrated geotextile tube is pumped into the modified conditioning tank via the discharge sleeve;

[0010] The high-efficiency dewatering system comprises a dewatering diaphragm pump and a dewatering geotextile tube; the modified slurry is pumped into the dewatering geotextile tube via a plurality of branch pipes.

[0011] Preferably, a pressure gauge is arranged in the dewatering geotextile tube to monitor the pore water pressure in the dewatering geotextile tube in real time; and an electric control valve is arranged on each branch pipe.

[0012] When the dewatering geotextile tube reaches the designed filling height, the pore water pressure in the dewatering geotextile tube is monitored; when the pore water pressure drops to a certain extent, the feeding to the dewatering geotextile tube is controlled to continue until the dewatering geotextile tube reaches the designed filling height again.

[0013] Preferably, the size of the feed end of the concentrated geotextile tube is smaller than that of the discharge end.

[0014] Preferably, the concentrated geotextile tube is placed on a slope with the feed end located above and the discharge end located below.

[0015] Preferably, the perforated pipe extends into the feed inlet of the concentrated geotextile tube by a distance L, wherein L is 10-30 times the diameter of the concentrated geotextile tube, and the center axis of the perforated pipe is 0.5-1 m away from the bottom of the concentrated geotextile tube.

[0016] Preferably, a sleeve is arranged on the upper part of the feed end of the concentrated geotextile tube, and a pressurized rubber air bag with a diameter of 1-3 m is embedded in the sleeve.

[0017] Preferably, a compressed air pipeline is sleeved in the discharge sleeve, a vibration exciting motor is arranged on the compressed air pipeline to cause vibration, and fins are welded on the outside of the compressed air pipeline to expand the vibration range of the concentrated slurry; the vibration exciting motor is connected to the middle of the compressed air pipeline to cause vibration.

[0018] Preferably, while the slurry is fed into the concentrated geotextile tube, the slurry separates from the water on the side wall of the concentrated geotextile tube to start concentration, and the amount of the original slurry Q0 fed into the dewatering geotextile tube is recorded.

[0019] Preferably, when the height of the dewatering geotextile tube reaches the maximum filling height H 浓max , the vibration exciter in the discharge sleeve is started to achieve the maximum vibration and drainage effect.

[0020] When the height of the dewatering geotextile tube is reduced to the height H 浓low due to continuous drainage, the compressed air valve connected to the compressed air pipeline is started, and the backflushing and drainage are performed for 5-10 minutes. When the height of the dewatering geotextile tube is stable, the compressed air valve is closed, and the dewatering and concentration of this batch is completed.

[0021] Preferably, after the mud is concentrated in the concentrated geotextile tube, the inflation valve of the pressurized rubber air bag is opened, the concentrated mud is pumped into the modified conditioning tank by the dewatering diaphragm pump, and the modifier is added into the tank; the vibration exciter is started to vibrate and excite.

[0022] In another aspect, a preferred embodiment of the present application also provides a dewatering method of a multi-stage intelligent dewatering system of a geotextile tube, comprising the following steps:

[0023] S1, filling the dredged mud into the concentrated geotextile tube;

[0024] S2, starting the vibration exciter to apply vibration at a frequency of 0 Hz, 9 Hz, 14 Hz and 20 Hz, observing the drainage amount of the concentrated geotextile tube, and determining the optimal vibration frequency under the best drainage effect;

[0025] S3, for the concentrated geotextile tube after dewatering treatment under the optimal vibration frequency in step S2, air inflation and pressure boosting are performed, the water amount in the lower drainage collection tank of the concentrated geotextile tube is observed, and the optimal air pressure under the best drainage effect is determined;

[0026] S4, for the concentrated geotextile tube after pressure boosting and drainage under the optimal air pressure, the transfer diaphragm pump and the vibration exciter are started to determine the optimal air pressure and vibration condition;

[0027] S5, the mud of the concentrated geotextile tube under the optimal air pressure and vibration condition is pumped into the dewatering geotextile tube by the dewatering diaphragm pump for dewatering treatment.

[0028] The present application at least has the following beneficial effects: the present application solves the problem of slow treatment speed in the traditional dewatering process of the geotextile tube, especially for the fine particle-containing sludge.

[0029] Other advantages, objects and features of the present application will be partly embodied in the following description, and partly understood by those skilled in the art through research and practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a frame schematic diagram of the multi-stage intelligent dewatering system of the geotextile tube in the present application.

[0031] Figure 2 The internal structure diagram of the concentrated geotechnical pipe bag in the present application.

[0032] Figure 3 The external structure diagram of the concentrated geotechnical pipe bag in the present application.

[0033] Figure 4 The flow process diagram of the geotechnical pipe bag multi-stage intelligent dehydration system in the present application.

[0034] Figure 5 The vibration drainage effect of the concentrated geotechnical pipe bag in the present application. DETAILED DESCRIPTION

[0035] The present application will be further described below in conjunction with the accompanying drawings, so that those skilled in the art can implement the present application according to the description and the drawings.

[0036] The following description is used to disclose the present application so that those skilled in the art can implement the present application. The preferred embodiments in the following description are only used as examples, and other obvious modifications can be thought of by those skilled in the art. The basic principles of the present application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present application.

[0037] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0038] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0039] As Figures 1-5 shown, a preferred embodiment of the present application provides a geotechnical pipe bag multi-stage intelligent dehydration system, which in turn includes a pretreatment and conditioning concentration system, a medium-pressure filter pressing concentration system, a modified conditioning and dosing system, and a high-efficiency dehydration system,

[0040] The pre-treatment and conditioning concentration system comprises a feed pump 1, a vibrating screen, a homogenizing tank, the slurry is lifted to the vibrating screen to remove large particles and then enters the homogenizing tank, a flocculant feeding tank 5 feeds flocculants into the homogenizing tank through a pipeline mixer 4, a flow meter 2 and a slurry detection module 3 are installed on the pipeline between the feed pump 1 and the homogenizing tank, and the flow and concentration of the slurry are detected in real time.

[0041] The medium-pressure filter concentration system comprises a plurality of parallelly arranged concentrated geotextile bags 6 and a punching pipe 6-4 sleeved at the feed port of the concentrated geotextile bag 6 and a discharge sleeve sleeved at the discharge port of the concentrated geotextile bag 1, the slurry pre-treated by the homogenizing tank is pumped into the geotextile bag, and the punching pipe can enhance the uniformity of the slurry in the concentrated geotextile bag.

[0042] When the concentrated geotextile bag is fed with the slurry, the slurry entering the concentrated geotextile bag is separated from water on the side wall of the concentrated geotextile bag to start concentration, the amount Q0 of the original slurry entering the concentrated geotextile bag is recorded, when it is monitored that the height of the concentrated geotextile bag reaches the maximum filling height H 浓max , the excitation motor in the discharge sleeve is started to realize the maximum vibration and promote the discharge effect, and the separated and dewatered slurry is discharged through the sludge discharge pipeline 7.

[0043] When it is monitored that the height of the concentrated geotextile bag is lowered to the height H 浓low due to continuous concentration and drainage, the compressed air valve connected to the compressed air pipeline is started, and the backflushing and discharge are performed for 5-10 min, when the H concentration is stable, the compressed air valve is closed, and the concentration of the batch is completed.

[0044] The discharge sleeve is sleeved with a compressed air pipeline 6-1, the compressed air pipeline 6-1 is provided with an excitation motor and can cause vibration, and the outer side of the compressed air pipeline is welded with fins 6-2 to expand the vibration range of the concentrated slurry and promote the slurry in the lower part of the concentrated geotextile bag to be discharged from the discharge port. The excitation motor 6-3 is connected in the middle of the compressed air pipeline and is used for exciting the slurry to make the mixing effect of the slurry and the modifier better and improve the modification effect.

[0045] The modification and conditioning adding system comprises a modification and conditioning tank 11 and a stirring motor, the stirring motor is installed in the modification and conditioning tank 11, and the slurry in the geotextile bag is pumped into the modification and conditioning tank through the discharge sleeve.

[0046] The high-efficiency dewatering system comprises a dewatering diaphragm pump 13 and a dewatering geotextile bag 15, and the slurry subjected to modification and conditioning is pumped into the dewatering geotextile bag 15 through a plurality of branch pipelines by the dewatering diaphragm pump 13.

[0047] Another technical solution, the dewatering geomembrane bag is provided with a pressure gauge, which monitors the pore water pressure in the dewatering geomembrane bag in real time, and the branch pipes are each provided with an electric control valve 14.

[0048] When one of the dewatering geomembrane bags reaches the filling height, the internal pore water pressure is monitored, and when the pore water pressure drops to a certain amplitude, the feeding to the dewatering geomembrane bag is continued until the designed filling height is reached again.

[0049] Another technical solution, the size of the feeding end of the concentrated geomembrane bag is smaller than that of the discharging end. The concentrated geomembrane bag is placed on a slope, and the feeding end is located above and the discharging end is located below. The feeding end of the concentrated geomembrane bag is a high-pressure end, and the discharging end is a negative pressure end, because the slurry continuously enters the feeding end, and the slurry is pumped out of the discharging end, and because the slurry has poor fluidity, a negative pressure area is generated.

[0050] Specifically, the concentrated geomembrane bag adopts a heteromorphism design of different sizes, the width of the feeding end is 50 cm, the width of the discharging end is 80 cm, the length is 150 cm, the height of the feeding section is 80 cm, and the height of the discharging end is 120 cm. The concentrated geomembrane bag is placed on a 15° slope, and the small head feeding end is above and the large head discharging section is below.

[0051] The upper part of the feeding end of the concentrated geomembrane bag 2 is provided with a sleeve, and a 1m-3m diameter pressurized rubber air bag is pre-buried inside.

[0052] The bag body of the concentrated geomembrane bag is connected by multiple pieces of woven cloth, and has a head and a filling port design. The top surface of the bag body is provided with a filling port for the slurry to enter, and the filling port is provided with a sleeve. The sleeve is the inlet of the concentrated geomembrane bag for filling slurry, and the circumferential wall at the bottom end of the sleeve is connected with a connecting flange. The bag body is provided with a pull ring on both sides in the width direction and at four corners, facilitating the movement and positioning of the bag body. The bag body is reinforced every 50 cm in the warp and weft directions, and is designed to have glue immersed in the woven cloth to enhance the structural stability.

[0053] The concentrated geomembrane bag parameters are as follows:

[0054] Table 1 Concentrated geomembrane bag parameters

[0055]

[0056] Another technical solution, the distance that the perforated pipe extends into the feeding port of the concentrated geomembrane bag is L, L is 10-30 times the pipe diameter of the geomembrane bag, and the center axis of the perforated pipe is 0.5-1m away from the bottom of the concentrated geomembrane bag.

[0057] Another technical solution, mud in the geotextile tube after completion of concentration, open the inflation valve of the pressurized rubber air bag, open the inflation valve is to form a dehydration pressure inside the geotextile tube, extrusion into the tube mud, complete the concentration, cooperate with the diaphragm pump to extract the concentrated mud into the modified conditioning tank, and then pour the modifier into it; start the vibration motor and the vibration motor to vibrate and excite, and then vibrate and excite the mud, so that it and the modifier can be mixed better, and the modification effect can be improved.

[0058] The dehydration process of the intelligent dehydration system of the present application is provided as follows:

[0059] S1, 1m 3 of concentrated geotextile tube is filled with 1m 3 of 25% solid content dredging mud, a small vibration motor of 25W is installed inside the concentrated geotextile tube, and a compressed air pipeline 7-1 with a diameter of 25cm is provided, and DN100 diameter vibration fins 7-2 are welded every 15cm on the compressed air pipeline 7-1. A sleeve is provided on the upper part of the inlet end of the concentrated geotextile tube.

[0060] In order to improve the dehydration effect and rate of the concentrated geotextile tube, a flocculating agent is added to the mud, and the coagulant is determined to be polyacrylamide (PAM) according to the results of the engineering test.

[0061] S2, after 1m 3 of concentrated geotextile tube is filled, start the vibration motor to apply vibration at a frequency of 0Hz, 9Hz, 14Hz and 20Hz, and observe the water quantity in the drainage collection tank at the lower part of the concentrated geotextile tube, and the results are shown in Figure 3 As can be seen from the comparison, the use of 9Hz, 14Hz and 20Hz amplitude can significantly improve the drainage effect compared with no treatment, especially the use of 9Hz frequency, which has the best drainage effect in the early stage of construction vibration.

[0062] S3, the concentrated geotextile tube after dehydration treatment at 9Hz vibration frequency in step S2 is inflated for 5min at different air pressure values (15-40kPa) respectively, the pressure effect and drainage effect of the compressed air are compared, and the water quantity in the drainage collection tank at the lower part of the concentrated geotextile tube is observed, and the results are shown in the following table. As can be seen, the use of 30kPa air pressure has the best drainage effect.

[0063] Table 1 drainage effect under different air pressure values

[0064]

[0065]

[0066] S4, the concentrated geotechnical pipe bag after 30kpa air pressure concentration, start the transfer diaphragm pump, excitation motor, discharge most of the concentrated slurry; wherein, under different conditions, the concentrated geotechnical pipe bag height as follows:

[0067] Table 2 drainage effect under different management

[0068] Serial number Height (cm) Remark 1 41.3 Self-rewatering, no air pressure, vibration synergy 2 38.8 35 kPa air pressure continuous action 3 38.6 Vibration continuous action 4 35.7 35 kPa air pressure + 9 Hz vibration continuous action

[0069] S5, the slurry of the concentrated geotechnical pipe bag under 35kPa+9Hz vibration condition is pumped into the dewatering geotechnical pipe bag via the dewatering diaphragm pump for dewatering treatment.

[0070] And intelligent filling in the dewatering geotechnical pipe bag, the filling time of the concentrated geotechnical pipe bag under different filling conditions, the dry weight of the slurry filled in the bag within 100min is counted. The test results are as follows, it can be seen that in the given time, the method of electric valve+diaphragm pump+pore water pressure gauge linkage can fill more slurry and form more slurry solidification in the concentrated geotechnical pipe bag.

[0071] Table 3 geotechnical pipe bag filling conditions under different measures

[0072]

[0073]

[0074] Although the embodiments of the present application have been disclosed as above, it is not limited to the application listed in the specification and the embodiments, and it can be fully applied to various fields suitable for the present application, and other modifications can be easily realized by those skilled in the art, therefore, the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. A multi-stage intelligent dewatering system for geotextile tube, characterized in that, The system sequentially comprises a pretreatment and conditioning concentration system, a medium-pressure pressure filtration concentration system, a modified conditioning and dosing system, and a high-efficiency dehydration system, The pretreatment and conditioning concentration system comprises a feed pump, a vibrating screen, and a homogenizing tank, and the slurry is lifted by the feed pump to the vibrating screen to remove large particles and then enters the homogenizing tank; a flocculating agent is added into the homogenizing tank through a pipeline mixer; The medium-pressure pressure filtration concentration system comprises a plurality of concentrated geotextile bags, a perforated pipe arranged at the inlet of the concentrated geotextile bag, and a discharge sleeve pipe arranged at the outlet of the concentrated geotextile bag, and the slurry pretreated by the homogenizing tank is pumped into the concentrated geotextile bag; The modified conditioning and dosing system comprises a modified conditioning tank and a stirring motor, and the stirring motor is arranged in the modified conditioning tank, and the slurry in the concentrated geotextile bag is pumped into the modified conditioning tank through the discharge sleeve pipe; The high-efficiency dehydration system comprises a dehydration diaphragm pump and a dehydration geotextile bag, and the slurry subjected to the modified conditioning is pumped into the dehydration geotextile bag through a plurality of branch pipes by the dehydration diaphragm pump; The size of the inlet end of the concentrated geotextile bag is smaller than that of the outlet end; The concentrated geotextile bag is arranged on a slope, and the inlet end is located at the upper side and the outlet end is located at the lower side; A sleeve is arranged at the upper portion of the inlet end of the concentrated geotextile bag, and a pressurized rubber air bag with a diameter of 1 m to 3 m is embedded in the sleeve; A compressed air pipeline is arranged in the discharge sleeve pipe, and a vibration exciting motor is arranged on the compressed air pipeline to cause vibration, and a fin is welded to the outer side of the compressed air pipeline to expand the vibration range of the concentrated slurry, and the vibration exciting motor is connected to the middle of the compressed air pipeline to cause vibration.

2. The geotube multi-stage intelligent dewatering system of claim 1, wherein, A pressure gauge is arranged in the dehydration geotextile bag to monitor the pore water pressure in the dehydration geotextile bag in real time, and an electric control valve is arranged on each branch pipe; When the filling height of a certain dehydration geotextile bag reaches a certain value, the pore water pressure in the bag is monitored, and when the pore water pressure decreases to a certain value, the feeding to the dehydration geotextile bag is controlled to continue until the filling height reaches the design value again.

3. The geotube multi-stage intelligent dewatering system of claim 1, wherein, The perforated pipe extends into the inlet of the concentrated geotextile bag by a distance L, and L is 10 to 30 times the diameter of the concentrated geotextile bag, and the central axis of the perforated pipe is 0.5 to 1 m away from the bottom of the concentrated geotextile bag.

4. The geotube multi-stage intelligent dewatering system of claim 1, wherein, While the slurry is fed into the concentrated geotextile bag, the slurry separates from the water on the side wall of the concentrated geotextile bag to start concentration, and the amount of the original slurry Q0 fed into the concentrated geotextile bag is recorded.

5. The geotube multi-stage intelligent dewatering system of claim 4, wherein, When the monitoring of the height of the concentrated geotextile tube reaches the maximum filling height H 浓max , the excitation motor in the discharge sleeve is started to achieve the maximum vibration and drainage effect. When the monitoring of the height of the concentrated geotextile tube is reduced to the height H 浓low due to the continuous concentration of drainage, the compressed air valve connected to the compressed air pipeline is started, and the back flushing is promoted for 5-10 min. When the height of the concentrated geotextile tube is stable, the compressed air valve is closed, and the dehydration concentration of this batch is completed.

6. The geotube multi-stage intelligent dewatering system of claim 5, wherein, After the concentration of the slurry in the concentrated geotextile bag is completed, the inflation valve of the pressurized rubber air bag is opened, the concentrated slurry is pumped into the modified conditioning tank, and a modifier is added into the modified conditioning tank; the vibration exciting motor is started to cause vibration and excitation.

7. A dewatering method based on the multi-stage intelligent dewatering system for geotextile tubes according to any one of claims 1-6, characterized in that, The method comprises the following steps: S1, filling the dredging slurry into the concentrated geotextile bag; S2, starting the vibration exciting motor to apply vibration at a frequency of 0 Hz, 9 Hz, 14 Hz, and 20 Hz, observing the drainage amount of the concentrated geotextile bag, and determining the optimal vibration frequency at which the drainage effect is best; S3, inflating and pressurizing the concentrated geotextile bag subjected to dehydration treatment at the optimal vibration frequency in step S2 to promote drainage, observing the water amount in the drainage collection tank at the lower portion of the concentrated geotextile bag, and determining the optimal air pressure at which the drainage effect is best; S4, to the concentrated geotextile tube after the best pressure boost drainage, start the transfer diaphragm pump, excitation motor, determine the best pressure vibration conditions; S5, the concentrated geotextile tube of the best pressure vibration conditions is pumped into the dewatering geotextile tube by the dewatering diaphragm pump to carry out dewatering treatment.

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