CN116197195B - Turbulent flow bag device and method for cleaning water supply pipeline by using ice-water mixture - Google Patents
Turbulent flow bag device and method for cleaning water supply pipeline by using ice-water mixture Download PDFInfo
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- CN116197195B CN116197195B CN202211656689.4A CN202211656689A CN116197195B CN 116197195 B CN116197195 B CN 116197195B CN 202211656689 A CN202211656689 A CN 202211656689A CN 116197195 B CN116197195 B CN 116197195B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 173
- 239000005457 ice water Substances 0.000 title claims abstract description 110
- 239000000203 mixture Substances 0.000 title claims abstract description 110
- 238000004140 cleaning Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 24
- 230000000694 effects Effects 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims description 26
- 238000011144 upstream manufacturing Methods 0.000 claims description 16
- 238000004088 simulation Methods 0.000 claims description 11
- 238000004836 empirical method Methods 0.000 claims description 8
- 239000002775 capsule Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000012806 monitoring device Methods 0.000 claims description 6
- 239000002351 wastewater Substances 0.000 claims description 6
- 230000016507 interphase Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 230000005514 two-phase flow Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 12
- 238000009826 distribution Methods 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
- B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
- B08B9/057—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices being entrained discrete elements, e.g. balls, grinding elements, brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a turbulent flow bag device and a method for cleaning a water supply pipeline by using an ice-water mixture, wherein the turbulent flow bag device comprises a bag body, a support body, a traction hole, a deflation hole and a traction rope, the bag body is a cloth-sandwiched bag-shaped rubber sealing product, the inflated bag body is in a cone shape and is fixed inside the water supply pipeline through the support body and the traction rope, and the top of the bag body faces the flowing direction of the ice-water mixture, so that the ice-water mixture can be disturbed, and the concentration of ice particles at the bottom of the pipeline and the cleaning effect of the bottom of the pipeline are improved. The invention solves the problem of uneven concentration distribution of the ice-water mixture in the technology of cleaning the water supply pipeline by the ice-water mixture and the bottleneck problem that the concentration of the ice-water mixture in the large-caliber water supply pipeline reaches the upper limit, and successfully promotes the cleaning technology to the cleaning of the large-caliber water supply pipeline, thereby realizing the overall efficient cleaning of the pipeline and ensuring that the technology of cleaning the pipeline by the ice-water mixture is more economic and efficient.
Description
Technical Field
The invention relates to the field of municipal water supply quality assurance, in particular to a turbulent flow bag device and a method for cleaning a water supply pipeline by using an ice-water mixture.
Background
The pipeline cleaning technology can clean the water supply pipeline under the non-excavation condition, and can effectively improve the water quality of the pipe network, so that the pipeline cleaning technology becomes a common solution for water quality guarantee.
The cleaning method of the large-caliber water supply pipeline commonly used at present mainly comprises the following steps: cleaning method, flushing method, high-pressure water jet pipeline cleaning method, air-water pulse pipeline cleaning method and pipeline cleaning robot. The cleaning method has high abrasion degree on the pipeline, is difficult to ensure that a complete anti-corrosion layer is reserved after the pipeline is cleaned, and has long cleaning time, thereby influencing domestic water of residents; the flushing method can only be applied to cleaning of small-caliber pipelines, has poor cleaning effect on large-caliber long pipelines, is difficult to popularize in a large range, has large water consumption, and cannot meet the basic policy of saving water in China; the high-pressure water jet pipeline cleaning method requires larger water pressure during operation, has large requirements on the nozzle and is complex to operate; the cleaning method of the air-water pulse pipeline utilizes bubbles to increase the turbulence of water in the pipeline, and has a general cleaning effect; the pipeline cleaning robot cannot meet the complex topological shape of the pipeline, and is required to provide kinetic energy for the pipeline when the pipeline works, so that a cleaning system is complex.
The technology for cleaning water supply pipeline by using ice-water mixture is a novel pipeline cleaning concept in water supply pipeline industry, and the ice-water mixture is pumped into the water supply pipeline to form an ice plug, and then the water in the water supply pipeline is utilized to push the ice plug to flow for pipeline cleaning. The ice-water mixture presents solid particle shearing property and liquid flowing property, can apply higher shearing force to the pipe wall than the traditional water flow cleaning, can still meet the complex topological shape in the pipe network, can melt and discharge along with the water flow even if the ice-water mixture is remained in the pipe, and is safe and pollution-free. Because of high efficiency, energy saving, environmental protection and safety, the device provides possibility for cleaning water supply pipelines efficiently and guaranteeing the water quality safety of water supply.
Water supply pipe based on ice water mixture washs, because ice particle density is less than liquid density, ice water mixture is in washing pipeline in-process ice particle concentration uneven distribution, and the ice thick liquid concentration of pipeline lower part is lower, can't form an effectual ice plug to wash the pipeline, causes the lower condition of bottom cleaning effect. In the cleaning operation of large-diameter pipelines, the condition of uneven concentration of ice-water mixture is more serious, and the lower part of the pipeline cannot be effectively cleaned.
Disclosure of Invention
According to the turbulent flow bag device and the method for cleaning the water supply pipeline by using the ice-water mixture, the concentration of ice particles at the bottom of the pipeline is improved by using the turbulent flow bag device, so that the utilization rate of the ice-water mixture is improved, the cleaning effect of the bottom of the pipeline is improved, and the whole pipeline is effectively cleaned.
The technical scheme of the invention is as follows:
a turbulent flow bag device for cleaning a water supply pipeline by using an ice-water mixture comprises a bag body 1, a supporting body 2, a traction hole 3, a deflation hole 4 and a traction rope 5;
The bag body 1 is a cloth-sandwiched bag-shaped rubber sealing product, the shape of the bag body after the gas in the bag is discharged is a flexible strip body, and the shape of the bag body after the inflation is completed is a cone;
The top of the bag body 1 is provided with a traction hole 3 which is connected with a traction rope 5; under the action of the traction rope 5, the central axis of the bag body 1 is parallel to the central axis of the water supply pipeline, the top of the bag body 1 faces the flowing direction of the ice-water mixture, and the ice-water mixture flows to the bottom of the bag body 1 along the top of the bag body 1;
The top of the bag body 1 is provided with an air hole 4 for inflation and exhaustion;
Selecting a plurality of sections perpendicular to a central shaft, namely a support section, on the bag body 1; a plurality of supporting bodies 2 are arranged on the section of each supporting body; the point symmetry relation is formed between the supporting bodies (2) by taking the intersection point of the central shaft and the cross section of the supporting bodies as the center;
The support body 2 is made of a hard material, and is not deformed under the flow impact of the ice-water mixture; one end of the support body 2, which is close to the central shaft of the bag body 1, is fixedly connected to the bag body 1;
Under the action of the hauling cable 5 and the support body 2, the central axis of the capsule body 1 is always parallel to the central axis of the water supply pipeline.
Further, the bottom diameter of the bag body 1 is half of the diameter of the pipeline to be cleaned;
the ratio of the bottom diameter of the capsule 1 to the height of the capsule 1 is 1:2.
Further, the distance between the end of the support body 2 close to the water supply pipeline and the pipe wall 6 is not less than 40mm.
Further, when the diameter of the water supply pipe is 400mm or less, the number of the supporting bodies 2 on the cross section of each supporting body is 3; when the diameter of the water supply pipeline is more than 400mm, the number of the supporting bodies 2 on the section of each supporting body is 5;
the number of the sections of the support body is not less than 2.
A method of cleaning a water supply pipe with an ice water mixture, comprising the steps of:
S1: collecting data of a water supply pipeline: diameter, length;
s2: a proper turbulence bag device 7 is selected according to the diameter of the water supply pipeline;
S3: according to the diameter and length of the water supply pipe, the following parameters are selected by using an empirical method or a numerical simulation method: the concentration of the ice-water mixture, the number and the spacing of the turbulence cell devices; the concentration refers to the ratio of the volume of ice to the volume of the ice-water mixture;
s4: preparing an ice-water mixture according to the concentration parameters obtained in the step S3;
s5: closing an upstream valve 8 and a downstream valve 10 of a water supply pipeline to be cleaned, and connecting a discharge rubber pipe 12 at a pipe section outlet 11; the discharge rubber pipe 12 is connected with a water quality monitoring device;
s6: the waste water in the water supply pipeline to be cleaned is completely discharged through the pipe section outlet 11 and the discharge rubber pipe 12;
S7: evacuating gas in the turbulent flow bag device 7 through the air vent 4, and connecting an inflatable rubber tube on the air vent 4; a traction rope 5 is connected to the traction hole 3;
s8: the turbulent flow bag device 7 is placed into the water supply pipeline through the pipeline inlet sealing position 9, and the turbulent flow bag device 7 is inflated by the inflation rubber pipe; after the inflation is finished, the inflatable rubber tube is removed, and the traction rope 5 is fixed at the closed position 9 of the pipeline inlet;
S9: opening the upstream valve 8 to place water into the water supply pipeline; after the water flow pushes the turbulent flow bag device 7 to the corresponding position, the upstream valve 8 is closed;
S10: injecting an ice-water mixture from an inlet of the water supply pipe;
S11: opening the upstream valve 8 to start cleaning the water supply pipeline; the conductivity value of the wastewater discharged from the discharge hose 12 is observed by the water quality monitoring device, if the conductivity value is restored to zero, the cleaning is stopped and the upstream valve 8 is closed, otherwise, the cleaning is continued.
Further, the conditions for selecting the spoiler bladder device in step S2 are as follows:
(S2-1) the diameter of the bottom of the bladder 1 is not more than half the diameter of the water supply pipe;
(S2-2) the distance between the supporting body 2 and the pipe wall 6 is not less than 40mm.
Further, the empirical method for selecting the ice-water mixture concentration in step S3 is:
The concentration of the ice-water mixture is 40-60%.
Further, the empirical method for selecting the number and the spacing of the spoiler bladder devices in step S3 is as follows:
When the pipe diameter of the water supply pipe is less than or equal to 200mm, the number and the interval of the turbulent flow bag devices are as follows:
if the length of the water supply pipeline to be cleaned is less than 50m, at least 1 turbulence bag device is arranged in the water supply pipeline;
If the length of the water supply pipeline to be cleaned is more than 50m and less than 100m, at least 2 turbulent flow bag devices are placed in the water supply pipeline;
If the length of the water supply pipeline to be cleaned is more than 200m, 1 turbulence sac is added every 50m of the length, and so on;
when the pipe diameter of the water supply pipeline is more than 200mm and less than or equal to 400mm, the number and the setting interval of the turbulent flow bag devices are as follows:
If the length of the water supply pipeline to be cleaned is less than 50m, at least 2 turbulence bag devices are placed in the water supply pipeline;
If the length of the water supply pipeline to be cleaned is more than 50m and less than 100m, at least 4 turbulent flow bag devices are placed in the water supply pipeline;
If the length of the water supply line to be cleaned is greater than 200m, then 2 turbulence cells are added for every 50m increase in length, and so on.
Further, the numerical simulation method in step S3 is as follows:
S3-1: selecting a monitoring section in the water supply pipe provided that the section is not only passing through the central axis of the water supply pipe but also perpendicular to the ground; selecting a monitoring line on the monitoring section, wherein the distance between the line and the lowest part of the pipeline is equal to one quarter of the diameter of the pipeline;
S3-2: a preprocessor of Fluent software is used for drawing a 2D model of the water supply pipeline and meshing;
S3-3: the physical model of the cleaning pipeline is as follows: starting from the inlet of a water supply pipeline, selecting a pipeline with a certain length, filling with an ice-water mixture with zero initial speed, and then enabling water to enter the water supply pipeline at a certain speed to push the ice-water mixture to advance; the physical model is built by using an Euler-Euler two-phase flow framework, and the viscosity attribute of the ice particles is constructed by using a particle dynamics method to close a momentum equation, and interphase acting forces comprise but are not limited to: drag force, lift force, and turbulence spreading force; the turbulence model adopts a standard k-epsilon model;
S3-4: calculating the concentration of the ice-water mixture on the monitoring line according to the physical model in the step S3-3, and if the concentration is larger than a preset threshold value, considering that the cleaning effect meets the requirement, otherwise, considering that the cleaning effect does not meet the requirement;
S3-5: adjusting the concentration of the ice-water mixture in the step S3-3, then re-executing the steps S3-3 to S3-4, and checking whether the concentration of the ice-water mixture on the monitoring line meets the requirement;
S3-6: placing a plurality of turbulence bag devices 7 in a water supply pipeline, adjusting the distance between the turbulence bag devices 7, and then re-executing the steps S3-3 to S3-4 to check whether the concentration of the ice-water mixture on the monitoring line meets the requirement;
s3-7: if the concentration on the whole monitoring line meets the requirement, the current ice-water mixture concentration, the number and the spacing of the turbulence cell devices 7 are selected as parameters meeting the requirement, otherwise, the parameters are adjusted and the steps S3-3 to S3-6 are re-executed.
Further, the predetermined threshold value in step S3-4 is 10%.
The beneficial technical effects of the invention are as follows:
(1) According to the characteristics of the ice-water mixture and the cleaning pipeline, reasonable ice-water mixture parameters are formulated, and the concentration of ice particles at the bottom of the pipeline is further improved by utilizing the turbulent flow bag, so that the bottom of the pipeline is effectively cleaned, and the cleaning efficiency of the pipeline is improved;
(2) Compared with the existing water supply pipeline cleaning technology, the numerical simulation model for cleaning the water supply pipeline by the ice-water mixture is constructed based on the numerical simulation method, the reliability and the reliability are high, the calculation are simple and convenient, the concentration distribution condition of the ice-water mixture in the process of cleaning the pipeline is analyzed, the ice-water mixture parameters of the cleaning pipeline are formulated, the pipeline cleaning efficiency is improved, and scientific guidance is provided for effectively cleaning the water supply pipeline;
(3) Compared with the existing technology for cleaning the water supply pipeline by using the ice-water mixture, the invention utilizes the turbulence bags to change the flowing direction of ice particles in the pipeline, improves the concentration distribution of the ice-water mixture and the concentration of the ice particles at the bottom of the pipeline, thereby solving the problem of uneven concentration distribution of the ice-water mixture and the bottleneck problem that the concentration of the ice-water mixture in the technology for cleaning the water supply pipeline reaches the upper limit, successfully popularizing the cleaning technology to the technology for cleaning the water supply pipeline with large caliber, realizing the integral efficient cleaning of the pipeline, saving the using amount of the ice-water mixture and ensuring that the cleaning technology is more economical and efficient;
(4) Compared with the existing pipeline cleaning effect improving device, the pipeline cleaning device is simple and convenient to operate, extremely low in cost and high in benefit, the number of the devices can be adjusted according to the pipeline cleaning length, and the pipeline cleaning device is suitable for long pipeline cleaning operation.
Drawings
FIG. 1 is a front view of a spoiler bladder arrangement;
FIG. 2 is a side view of the spoiler bladder arrangement;
FIG. 3 is a schematic diagram of the operation of the spoiler bladder arrangement;
FIG. 4 is a graph of a first distribution of ice particle concentration at the bottom of a pipeline calculated by a numerical simulation method;
FIG. 5 is a graph of a second distribution of ice particle concentration at the bottom of a pipeline calculated by a numerical simulation method;
FIG. 6 is a third graph of a pipeline bottom ice particle concentration profile calculated by a numerical modeling method;
Fig. 7 is a schematic view of the installation of the spoiler bladder arrangement inside the water supply conduit.
In the figure, the correspondence between the component names and the drawing numbers is: 1. a bladder; 2. a support body; 3. a traction hole; 4. a bleed hole; 5. a traction rope; 6. a tube wall; 7. a turbulent flow bag device; 8. an upstream valve; 9. the inlet of the pipeline is closed; 10. a downstream valve; 11. a pipe section outlet; 12. and discharging the rubber tube.
Detailed Description
The present invention will be described in detail below with reference to the drawings and examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The turbulence bag device 7 used in the embodiment is shown in fig. 1 and 2, and is composed of a bag body 1, a supporting body 2, a traction hole 3, a deflation hole 4 and a traction rope 5, and has the function of enabling ice particles accumulated on the upper part of a pipeline to flow to the bottom of the pipeline, so that the condition of uneven concentration distribution of an ice-water mixture is improved, and the problem that the bottom of the pipeline cannot be effectively cleaned is solved.
The bag body 1 is a cloth-sandwiched bag-shaped rubber sealing product and has better pressure-bearing, wear-resisting and corrosion-resisting properties. After the gas in the bag is discharged, the bag body 1 is in a flexible strip shape and can be conveniently placed in a water supply pipeline; after inflation, the shape of the bag body 1 is a cone. The shape can change the speed vector direction of the ice particles from a single pipeline flow direction to the tangential direction of the slope of the turbulent flow bag main body when the ice-water mixture flows through the turbulent flow bag main body, so that the ice particles in the center of the pipeline obtain the kinetic energy of flow diffusion to the pipe wall, and the concentration of the ice-water mixture at the bottom of the pipeline is improved.
The ratio of the height of the cone of the bag body 1 to the diameter of the bottom is 2:1, and the whole bag body is provided with a longer slope, so that the kinetic energy loss of the ice-water mixture flowing through the turbulent bag body can be reduced, the ice-water mixture can still keep a larger speed in the flowing process, and a larger shearing force is provided for the pipe wall.
The diameter of the bottom of the cone of the bag body 1 is half of the diameter of a water supply pipeline to be cleaned, and a larger flow cross section is reserved, so that the flow of the ice-water mixture can not be blocked.
The top of the bag body 1 is provided with a traction hole 3 which is connected with a traction rope 5. Under the action of the hauling rope 5, the central axis of the bag body 1 is parallel to the central axis of the water supply pipeline, the top of the bag body 1 faces the flowing direction of the ice-water mixture, and the ice-water mixture flows to the bottom of the bag body 1 along the top of the bag body 1. In the pipeline cleaning process, the turbulent flow bag can be pushed by water flow and ice-water mixture in the pipeline, and the traction rope can pull the turbulent flow bag, so that the position of the turbulent flow bag in the pipeline section is fixed.
The top of the bladder 1 is provided with a bleed hole 4 for inflation and deflation.
3 Sections perpendicular to the central axis, namely support sections, are selected on the capsule body 1, and the distances among the support sections are equal. Each support body section is provided with a plurality of support bodies 2, and the function of the support bodies is to enable the turbulent flow bag main body to be kept at the center of the pipeline section, so that a certain overflow space is reserved on the upper part and the lower part of the turbulent flow bag main body.
When the diameter of the water supply pipeline is less than or equal to 400mm, the number of the supporting bodies 2 on the section of each supporting body is 3; when the diameter of the water supply pipe is greater than 400mm, the number of the supporting bodies 2 per supporting body section is 5. The support bodies 2 are in point symmetry with the intersection point of the central axis and the cross section of the support bodies as the center.
The support body 2 is made of a hard material, and is not deformed under the flow impact of the ice-water mixture; one end of the support body 2, which is close to the central shaft of the bag body 1, is fixedly connected to the bag body 1, and the distance between the other end, which is close to the water supply pipeline, and the pipe wall 6 is not less than 40mm.
Under the action of the hauling rope 5 and the supporting body 2, the central axis of the bag body 1 is always parallel to the central axis of the water supply pipeline and is kept in the center of the pipeline, so that the ice particles in the center of the pipeline effectively flow to the bottom of the pipeline; meanwhile, due to the aggregation effect, the ice particles at the top of the pipeline are large in concentration and small in momentum, and a larger overflow surface is reserved on the upper part of the pipeline by the support body at the upper part of the turbulence bag device 7, so that the flow of the ice particles at the top of the pipeline is not influenced, and the ice particles smoothly flow through the turbulence bag device 7 without causing blockage. The flow of the ice-water mixture around the turbulence cell means 7 is shown in fig. 3.
The method for cleaning the water supply pipeline by using the turbulent flow bag device 7 is as follows:
S1: collecting data of a water supply pipeline: diameter, length. The water supply pipe of the example had a diameter of 400mm and a length of 400m.
S2: the appropriate turbulence cell means 7 are selected according to the diameter of the water supply pipe. The selection conditions were as follows:
(1) The diameter of the bottom of the bag body 1 is not more than half of the diameter of the water supply pipeline;
(2) The distance between the supporting body 2 and the pipe wall 6 is not less than 40mm.
S3: according to the diameter and length of the water supply pipe, the following parameters are selected by using an empirical method or a numerical simulation method: the concentration of the ice-water mixture, the number of the turbulence cell devices and the spacing. The concentration refers to the ratio of the volume of ice to the volume of the ice-water mixture.
The concentration of the ice-water mixture is selected by an empirical method to be simpler, and the value is between 40 and 60 percent.
The number and spacing of the spoiler bladder arrangements 7 are selected empirically as follows:
(1) When the pipe diameter of the water supply pipe is less than or equal to 200mm, the number and the interval of the turbulent flow bag devices 7 are as follows:
(1-1) if the length of the water supply pipe to be cleaned is less than 50m, at least 1 turbulence cell means 7 are placed;
(1-2) if the length of the water supply pipe to be cleaned is greater than 50m and less than 100m, at least 2 spoiler bladder devices 7 are placed;
(1-3) if the length of the water supply pipe to be cleaned is greater than 200m, 1 spoiler device 7 is added every 50m of the length, and so on;
(2) When the pipe diameter of the water supply pipe is more than 200mm and less than or equal to 400mm, the number and the setting interval of the turbulent flow bag devices 7 are as follows:
(2-1) if the length of the water supply pipe to be cleaned is less than 50m, at least 2 turbulence cell means 7 are placed;
(2-2) if the length of the water supply pipe to be cleaned is greater than 50m and less than 100m, at least 4 spoiler bladder devices 7 are placed;
(2-3) if the length of the water supply pipe to be cleaned is greater than 200m, 2 spoiler devices 7 are added every 50m of the length, and so on.
The specific steps of selecting the concentration of the ice-water mixture, the number and the spacing of the turbulent flow bag devices 7 by using a numerical simulation method are as follows:
S3-1: selecting a monitoring section in the water supply pipe provided that the section is not only passing through the central axis of the water supply pipe but also perpendicular to the ground; selecting a monitoring line on the monitoring section, wherein the distance between the line and the lowest part of the pipeline is equal to one quarter of the diameter of the pipeline;
S3-2: a preprocessor of Fluent software is used for drawing a 2D model of the water supply pipeline and meshing;
S3-3: the physical model of the cleaning pipeline is as follows: starting from the inlet of a water supply pipeline, selecting a pipeline with a certain length, filling with an ice-water mixture with zero initial speed, and then enabling water to enter the water supply pipeline at a certain speed to push the ice-water mixture to advance; the physical model is built by using an Euler-Euler two-phase flow framework, and the viscosity attribute of the ice particles is constructed by using a particle dynamics method to close a momentum equation, and interphase acting forces comprise but are not limited to: drag force, lift force, and turbulence spreading force; the turbulence model adopts a standard k-epsilon model;
S3-4: calculating the concentration of the ice-water mixture on the monitoring line according to the physical model in the step S3-3, and if the concentration is larger than a preset threshold value, considering that the cleaning effect meets the requirement, otherwise, considering that the cleaning effect does not meet the requirement;
S3-5: adjusting the concentration of the ice-water mixture in the step S3-3, then re-executing the steps S3-3 to S3-4, and checking whether the concentration of the ice-water mixture on the monitoring line meets the requirement;
S3-6: placing a plurality of turbulence bag devices 7 in a water supply pipeline, adjusting the distance between the turbulence bag devices 7, and then re-executing the steps S3-3 to S3-4 to check whether the concentration of the ice-water mixture on the monitoring line meets the requirement;
s3-7: if the concentration on the whole monitoring line meets the requirement, the current ice-water mixture concentration, the number and the spacing of the turbulence cell devices 7 are selected as parameters meeting the requirement, otherwise, the parameters are adjusted and the steps S3-3 to S3-6 are re-executed.
The numerical simulation calculation results of the examples are shown in fig. 4 to 6. The parameters of fig. 4 are as follows:
(1) The concentration of the ice-water mixture was 40%;
(2) The length of the injected ice-water mixture is one third of that of the water supply pipeline;
(3) Three monitoring positions are selected on a monitoring line of the remaining pipe section of the water supply pipe, which is not injected with the ice-water mixture, and concentration changes of the three positions are monitored.
As can be seen from fig. 4, at the cleaning parameters, the concentration of the ice-water mixture is lower than 2% in each monitoring pipe section, and the cleaning effect on the bottom of the pipe is poor, so that the concentration of the injected ice-water mixture needs to be increased.
The parameters of fig. 5 are as follows:
(1) The concentration of the ice water mixture was 50%;
(2) The length of the injected ice-water mixture is two thirds of that of the water supply pipeline;
(3) Two monitoring positions are selected on a monitoring line of the remaining pipe section of the water supply pipe, which is not injected with the ice-water mixture, and concentration changes of the two positions are monitored.
As can be seen from fig. 5, at this cleaning parameter, the concentration of the ice-water mixture was below 10% in each of the monitored pipe sections, and although improved as compared to fig. 4, the cleaning requirement was not met. However, the injection parameters of the ice water mixture have reached the limit of optimizing the pigging effect.
Fig. 6 is based on fig. 5 with two spoiler bladder arrangements 7. As can be seen from fig. 6, the concentration of the ice-water mixture in the pipe section after the turbulence bags are added is greatly improved, and the concentration of the ice-water mixture at the bottom of a quarter pipeline of the pipe section at the second half section is also improved to more than 10%, which indicates that the whole water supply pipeline is effectively cleaned. The concentration of the ice-water mixture, the number and the spacing of the turbulence cell means 7 are parameters which meet the requirements.
S4: and (3) preparing an ice-water mixture according to the concentration parameter obtained in the step S3.
S5: as shown in fig. 7, the upstream valve 8 and the downstream valve 10 of the water supply pipe to be cleaned are closed, and a discharge hose 12 is connected to the pipe section outlet 11; the discharge rubber pipe 12 is connected with a water quality monitoring device.
S6: the wastewater inside the water supply pipe to be cleaned is completely discharged through the pipe section outlet 11 and the discharge hose 12.
S7: evacuating gas in the turbulent flow bag device 7 through the air vent 4, and connecting an inflatable rubber tube on the air vent 4; a traction rope 5 is connected to the traction hole 3.
S8: the turbulent flow bag device 7 is placed into the water supply pipeline through the pipeline inlet sealing position 9, and the turbulent flow bag device 7 is inflated by the inflation rubber pipe; after the inflation is finished, the inflatable rubber tube is removed, and the traction rope 5 is fixed at the closed position 9 of the pipeline inlet.
S9: opening the upstream valve 8 to place water into the water supply pipeline; after the water flow pushes the turbulent flow bag device 7 to the corresponding position, the upstream valve 8 is closed.
S10: an ice-water mixture is injected from an inlet of the water supply pipe.
S11: opening the upstream valve 8 to start cleaning the water supply pipeline; the conductivity value of the wastewater discharged from the discharge hose 12 is observed by the water quality monitoring device, if the conductivity value is restored to zero, the cleaning is stopped and the upstream valve 8 is closed, otherwise, the cleaning is continued.
Although the embodiments of the present invention have been disclosed in the foregoing description and drawings, it is not limited to the details of the embodiments and examples, but is to be applied to all the fields of application of the present invention, it will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
1. Utilize ice water mixture to wash water supply pipe's vortex bag device, its characterized in that:
comprises a bag body (1), a supporting body (2), a traction hole (3), a deflation hole (4) and a traction rope (5);
The bag body (1) is a cloth-sandwiched bag-shaped rubber sealing product, the shape of the bag body after the gas in the bag is discharged is a flexible strip body, and the shape of the bag body after the gas is inflated is a cone;
the top of the bag body (1) is provided with a traction hole (3) which is connected with a traction rope (5); under the action of the traction rope (5), the central axis of the bag body (1) is parallel to the central axis of the water supply pipeline, the top of the bag body (1) faces the flow direction of the ice-water mixture, and the ice-water mixture flows to the bottom of the bag body (1) along the top of the bag body (1);
The top of the bag body (1) is provided with an air hole (4) for inflating and exhausting;
Selecting a plurality of sections perpendicular to a central axis, namely a support section, on the capsule body (1); a plurality of supporting bodies (2) are arranged on the section of each supporting body; the point symmetry relation is formed between the supporting bodies (2) by taking the intersection point of the central shaft and the cross section of the supporting bodies as the center;
The support body (2) is made of a hard material and cannot be deformed under the flowing impact of the ice-water mixture; one end of the support body (2) close to the central shaft of the bag body (1) is fixedly connected to the bag body (1);
Under the action of the traction rope (5) and the supporting body (2), the central axis of the bag body (1) is always parallel to the central axis of the water supply pipeline.
2. A turbulence cell apparatus for cleaning a water supply pipe using an ice water mixture as claimed in claim 1, wherein:
The bottom diameter of the bag body (1) is half of the diameter of a pipeline to be cleaned;
The ratio of the bottom diameter of the capsule body (1) to the height of the capsule body (1) is 1:2.
3. A turbulence cell arrangement for cleaning a water supply pipe with an ice-water mixture according to claim 1, characterized in that the distance between the end of the support body (2) close to the water supply pipe and the pipe wall (6) is not less than 40mm.
4. A turbulence cell apparatus for cleaning a water supply pipe using an ice water mixture as claimed in claim 1, wherein:
When the diameter of the water supply pipeline is less than or equal to 400mm, the number of the supporting bodies (2) on the section of each supporting body is 3; when the diameter of the water supply pipeline is larger than 400mm, the number of the supporting bodies (2) on the section of each supporting body is 5;
the number of the sections of the support body is not less than 2.
5. A method for cleaning a water supply pipe using an ice water mixture using the turbulence cell apparatus as claimed in any one of claims 1 to 4, comprising the steps of:
S1: collecting data of a water supply pipeline: diameter, length;
S2: a proper turbulence bag device (7) is selected according to the diameter of the water supply pipeline;
S3: according to the diameter and length of the water supply pipe, the following parameters are selected by using an empirical method or a numerical simulation method: the concentration of the ice-water mixture, the number and the spacing of the turbulence cell devices; the concentration refers to the ratio of the volume of ice to the volume of the ice-water mixture;
s4: preparing an ice-water mixture according to the concentration parameters obtained in the step S3;
S5: closing an upstream valve (8) and a downstream valve (10) of a water supply pipeline to be cleaned, and connecting a discharge rubber pipe (12) at an outlet (11) of the pipeline section; the discharge rubber tube (12) is connected with a water quality monitoring device;
S6: the waste water in the water supply pipeline to be cleaned is completely discharged through a pipe section outlet (11) and a discharge rubber pipe (12);
S7: evacuating gas in the turbulent flow bag device (7) through the air vent (4), and connecting an inflatable rubber tube on the air vent (4); a traction rope (5) is connected to the traction hole (3);
S8: the turbulent flow bag device (7) is placed in the water supply pipeline through the pipeline inlet sealing part (9), and the turbulent flow bag device (7) is inflated by the inflation rubber pipe; after the inflation is finished, the inflatable rubber tube is removed, and the traction rope (5) is fixed at the closed position (9) of the pipeline inlet;
s9: opening an upstream valve (8) to place water into the water supply pipeline; after the water flow pushes the turbulent flow bag device (7) to the corresponding position, the upstream valve (8) is closed;
S10: injecting an ice-water mixture from an inlet of the water supply pipe;
s11: opening an upstream valve (8) to start cleaning the water supply pipeline; the conductivity value of the wastewater discharged from the discharge rubber pipe (12) is observed through the water quality monitoring device, if the conductivity value is restored to zero, the cleaning is stopped, the upstream valve (8) is closed, and otherwise, the cleaning is continued.
6. The method for cleaning a water supply pipe using an ice-water mixture according to claim 5, wherein the conditions for selecting the turbulent flow bladder means in step S2 are as follows:
(S2-1) the diameter of the bottom of the bag body (1) is not more than half of the diameter of the water supply pipeline;
(S2-2) the distance between the supporting body (2) and the pipe wall (6) is not less than 40mm.
7. The method for cleaning a water supply pipe using an ice-water mixture as claimed in claim 5, wherein the empirical method for selecting the ice-water mixture concentration in step S3 is as follows:
The concentration of the ice-water mixture is 40-60%.
8. The method for cleaning a water supply pipe using an ice-water mixture as claimed in claim 5, wherein the empirical method for selecting the number and spacing of the turbulence cell means in step S3 is as follows:
When the pipe diameter of the water supply pipe is less than or equal to 200mm, the number and the interval of the turbulent flow bag devices are as follows:
if the length of the water supply pipeline to be cleaned is less than 50m, at least 1 turbulence bag device is arranged in the water supply pipeline;
If the length of the water supply pipeline to be cleaned is more than 50m and less than 100m, at least 2 turbulent flow bag devices are placed in the water supply pipeline;
If the length of the water supply pipeline to be cleaned is more than 200m, 1 turbulence sac is added every 50m of the length, and so on;
when the pipe diameter of the water supply pipeline is more than 200mm and less than or equal to 400mm, the number and the setting interval of the turbulent flow bag devices are as follows:
If the length of the water supply pipeline to be cleaned is less than 50m, at least 2 turbulence bag devices are placed in the water supply pipeline;
If the length of the water supply pipeline to be cleaned is more than 50m and less than 100m, at least 4 turbulent flow bag devices are placed in the water supply pipeline;
If the length of the water supply line to be cleaned is greater than 200m, then 2 turbulence cells are added for every 50m increase in length, and so on.
9. The method of cleaning a water supply line with an ice-water mixture according to claim 5, wherein the numerical simulation of step S3 is as follows:
S3-1: selecting a monitoring section in the water supply pipe provided that the section is not only passing through the central axis of the water supply pipe but also perpendicular to the ground; selecting a monitoring line on the monitoring section, wherein the distance between the line and the lowest part of the pipeline is equal to one quarter of the diameter of the pipeline;
S3-2: a preprocessor of Fluent software is used for drawing a 2D model of the water supply pipeline and meshing;
S3-3: the physical model of the cleaning pipeline is as follows: starting from the inlet of a water supply pipeline, selecting a pipeline with a certain length, filling with an ice-water mixture with zero initial speed, and then enabling water to enter the water supply pipeline at a certain speed to push the ice-water mixture to advance; the physical model is built by using an Euler-Euler two-phase flow frame, a momentum equation is closed by adopting a particle dynamics method to construct the viscosity attribute of ice particles, and the interphase acting force comprises the following components: drag force, lift force, and turbulence spreading force; turbulence model using standard A model;
S3-4: calculating the concentration of the ice-water mixture on the monitoring line according to the physical model in the step S3-3, and if the concentration is larger than a preset threshold value, considering that the cleaning effect meets the requirement, otherwise, considering that the cleaning effect does not meet the requirement;
S3-5: adjusting the concentration of the ice-water mixture in the step S3-3, then re-executing the steps S3-3 to S3-4, and checking whether the concentration of the ice-water mixture on the monitoring line meets the requirement;
S3-6: placing a plurality of turbulence bag devices (7) in a water supply pipeline, adjusting the distance between the turbulence bag devices (7), and then re-executing the steps S3-3 to S3-4 to check whether the concentration of the ice-water mixture on the monitoring line meets the requirement;
S3-7: if the concentration on the whole monitoring line meets the requirement, the current concentration of the ice-water mixture, the number and the spacing of the turbulence bag devices (7) are selected as parameters meeting the requirement, otherwise, the parameters are adjusted and the steps S3-3 to S3-6 are re-executed.
10. A method of cleaning a water supply line with an ice-water mixture according to claim 9, wherein the predetermined threshold value of step S3-4 is 10%.
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| CN202211656689.4A CN116197195B (en) | 2022-12-22 | 2022-12-22 | Turbulent flow bag device and method for cleaning water supply pipeline by using ice-water mixture |
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| GB1454756A (en) * | 1972-11-03 | 1976-11-03 | Nat Lime Ass | Gas scrubbing apparatus and process |
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| CN116197195A (en) | 2023-06-02 |
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