CN108151791B - Method for analyzing pipeline fouling distribution - Google Patents
Method for analyzing pipeline fouling distribution Download PDFInfo
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- CN108151791B CN108151791B CN201810075197.3A CN201810075197A CN108151791B CN 108151791 B CN108151791 B CN 108151791B CN 201810075197 A CN201810075197 A CN 201810075197A CN 108151791 B CN108151791 B CN 108151791B
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Abstract
The invention discloses a method for analyzing pipeline fouling distribution, which comprises the following steps of S1: acquiring parameters of each drainage pipeline; grouping pipelines, and installing liquid level meters on the inspection wells at the upstream and downstream of each group of pipelines; s2: screening and processing water level data to obtain the water level Hn of the inspection well; s3: according to the state of water flow in the pipeline as full flow pipe or non-full flow pipe, the following hydraulic calculation is carried out: s31: for a full flow pipe, the water level difference delta H is mainly formed by the local head loss H Office (bureau) And the along-path head loss h Edge of the frame Composition according to hn Office (bureau) And hn (hn) Edge of the frame Determining the fouling condition; s32: for the non-full flow pipe, the fouling condition is judged by using the Froude number Fr of the water flow and the water flow velocity v. According to the invention, the liquid level meter or the flowmeter is arranged in the inspection well, the acquired water level or flow data is screened, processed and analyzed and calculated, so that the real-time tracking and monitoring of the sedimentation distribution condition of the drainage pipeline are realized in a more economical and safer mode, and a relevant basis is provided for the dredging period of the drainage pipeline.
Description
Technical Field
The invention belongs to the field of pipeline detection, and particularly relates to a method for analyzing pipeline siltation distribution.
Background
The sewage is collected and discharged to a treatment facility through a drainage pipeline, but suspended solids in the sewage can be precipitated in the conveying process; as the service time of the drain pipe increases, the possibility of fouling increases dramatically, and pipe fouling blockage is an important problem faced in the management of the daily operation of the drain pipe network. Sediment accumulation hydraulic power can cause increase of along-path head loss, so that drainage is unsmooth, overload operation of a drainage system and combined overflow arrive in advance, even overflow to a road surface, and water accumulation and environmental pollution are caused.
Common methods currently used to determine the distribution of drain pipe fouling are manual investigation and CCTV detection (drain pipe television detection). For large-diameter pipelines which can be accessed by personnel, from the economical point of view, constructors can be directly accessed to the inspection record, and for pipelines which cannot be accessed by personnel, CCTV detection can be used. The CCTV detection system consists of three parts, namely a main controller, an operating cable frame and a robot crawler with a camera lens; the main controller is arranged on the crawler, an operator controls the advancing speed and the advancing direction of the crawler in the pipeline through the main controller, and controls the camera lens to transmit video images in the pipeline to the main controller display screen through a cable, so that the operator can monitor the internal condition of the pipeline in real time, and meanwhile, the original image record is stored for further analysis; after the field work of CCTV is completed, the encoding of pipeline defects is carried out according to the detected video data, defect pictures are captured, detection reports are compiled, the CCTV image data is processed according to the requirements of users, video tape or optical disk archiving is provided, and the future pipeline repair work is guided.
The manual investigation method has the defects that the condition in the drainage pipeline is complex, and toxic and harmful gas with certain concentration exists, so that the safety and the health of workers can be threatened; however, CCTV detection has the disadvantages of expensive equipment, complex operation process, and influence on pipe network operation by inspection process. At present, a simple and effective technical means for grasping the actual running condition of the drainage pipe network is lacking in running management so as to evaluate the daily siltation condition of the underground drainage pipe network and provide necessary data support for hydraulic analysis and maintenance dredging management of the drainage pipe network.
Disclosure of Invention
The invention provides a method for analyzing pipeline siltation distribution, which is characterized in that a liquid level meter is arranged in an inspection well to screen, process, analyze and calculate acquired water level data, so that real-time tracking and monitoring of the water drainage pipeline siltation distribution condition are realized in a more economical and safer mode, and a relevant basis is provided for the dredging period of the water drainage pipeline.
The technical scheme of the invention is as follows:
a method of analyzing a pipeline fouling profile, comprising the steps of:
s1: acquiring parameters of each drainage pipeline, including pipe length, pipe diameter, pipeline gradient and roughness coefficients; grouping pipelines, namely grouping a plurality of pipelines which are connected end to end in a drainage system, have the same pipe diameter and have unchanged flow, wherein the number of an upstream inspection well of each group of pipelines is denoted as n, the number of a downstream pipeline is denoted as n+1, the length of a main pipe of an nth group is denoted as L, and the pipe diameter is denoted as d; installing a liquid level meter on the inspection well at the upstream and downstream of each group of pipelines;
s2: screening and processing water level data to obtain the water level Hn of the inspection well;
s3: according to the state of water flow in the pipeline as full flow pipe or non-full flow pipe, the following hydraulic calculation is carried out:
s31: for a full flow pipe, the water level difference △ H is mainly composed of local head loss H Office (bureau) And the along-path head loss h Edge of the frame Composition in which fouling in the pipe is responsible for local head loss h Office (bureau) For the main reasons of (1), the upstream and downstream manhole water level differences Δhn of the nth group of pipe sections, Δhn=hn Office (bureau) +hn Edge of the frame According to hn Office (bureau) And hn (hn) Edge of the frame Is determined by the relative size of (a) the fouling condition:
(a) Local head loss hn Office (bureau) <<Loss of along-path head hn Edge of the frame Before the nth group of pipelines is silted upThe post water level difference has no obvious change, and the nth group of pipelines are judged to be difficult to pool;
(b)the nth group of pipes is determined to be easily silted pipes;
s32: for a non-full flow pipe, the Fr number Fr of water flow and the water flow speed v are used for judging the sedimentation condition, and the Fr and v are calculated by the following formula:
and->Wherein:
h represents the water depth of a certain section in the pipeline, and m; n represents a pipeline roughness coefficient; r represents a hydraulic radius, m; i represents the gradient of the pipeline; g represents the acceleration of gravity, m/s 2 ；
The judging method comprises the following steps:
(c) When Fr is more than 1, the water flow in the pipeline is rapid flow, and the probability of occurrence of clogging is low due to the large flow speed, so that the group of pipelines belongs to the pipeline which is not easy to be deposited;
(d) When Fr <1, v >0.6m/s, this set of pipes is the possible presence of fouling pipes;
(e) When Fr <1 and v <0.6m/s, the set of pipes is a fouling prone pipe.
Preferably, in the step S31The n-th group of pipes is determined to be easily fouled pipes, and the presence of a foulant, and the classification of the fouled pipes includes the steps of:
s3101: along-path head loss h of full flow pipe Edge of the frame Calculated using the darcy-weber formula, the formula is as follows:
h in f For head loss along the journey, i.e. h Edge of the frame The method comprises the steps of carrying out a first treatment on the surface of the d is the diameter of the pipeline, m; l is the length of the pipeline, m; v is the average flow velocity of the cross section of the water, m/s; g is gravity acceleration, m/s 2 The method comprises the steps of carrying out a first treatment on the surface of the Lambda is the coefficient of resistance along the way,c is the Xuetalent coefficient->Wherein n is a pipeline roughness coefficient;
s3102: the group of pipes in which the sludge is located is reduced to a parallel connection of a suddenly reduced pipe and a suddenly enlarged pipe, the local head loss h at the suddenly reduced pipe 1 The following formula is calculated and,
local head loss h at suddenly enlarged pipe 2 The following formula is calculated and,
wherein: a is that Big size To the cross-sectional area of the pipeline at the position without sediment, m 2 ；A Small size For the cross-sectional area of the pipeline where the sludge exists, m 2 ；v 1 Fluid flow rate in the pipeline at the position without sludge, m/s; v 2 The flow velocity of fluid in a pipeline with sludge is m/s;
from the law of conservation of mass it is known that: q=v 1 ×A Big size ＝v 2 ×A Small size ，
Local head loss h Office (bureau) ＝h 1 +h 2 ，
Selecting the head and the tail of an interval time as the starting time and the ending time, and respectively acquiring water level data H of the inspection wells at the upstream and downstream of each group of pipelines at the starting time and the ending time Start n 、H Start n+1 、H Terminal n 、H Terminal n+1 Calculating to obtain the upstream and downstream water level difference h of two time points Starting from the beginning ＝H Start n+1 -H Start n And h Terminal (A) ＝H Terminal n+1 -H Terminal n Local head loss h Office (bureau) ＝H Terminal (A) -H Starting from the beginning Loss of water head along the path h Edge of the frame ＝H Starting from the beginning Therefore, it is
H of the nth group of pipes Start n 、H Start n+1 、H Terminal n 、H Terminal n+1 Substituting d, lambda, L into the above formula to calculate the group
S3103: will be of each groupSequentially arranged according to the numerical value and divided into a plurality of sedimentation grades, +.>The larger the number, the more severe the piping fouling of this grade.
Preferably, step S3104 is further included: a pipe network chart is drawn, and different colors are marked on the pipe network chart according to the fouling level of the step S3103.
Preferably, in the step S1, L/d of each group of pipelines is <1000.
Preferably, in the step S2, the screening of the water level data includes: for each inspection well, selecting water level data of a group of water level data curves which are not rainy days and have smooth change and have a fixed period every several days; the processing of the water level data comprises the following steps: and for each group of water level data, removing water level data with large deviation, and then taking an average value to obtain the water level Hn of the inspection well.
Preferably, the level gauge installed in the manhole is replaced with a flow meter, and the other steps are implemented as described aboveFor example, the method comprises the steps of obtaining parameters of each drainage pipeline, and grouping the pipelines, wherein a plurality of pipelines which are connected end to end in a drainage system, have the same pipe diameter and have unchanged flow are divided into a group, the number of an upstream inspection well of each group of pipelines is recorded as n, and the number of a downstream pipeline is recorded as n+1; and installing flow meters on the inspection wells at the upstream and downstream of each group of pipelines, and respectively recording the values Q of the flow meters in the upstream and downstream inspection wells n 、Q n+1 ；
If Q n+1 /Q n <1, the pipeline of the group is blocked, and Q of each group is calculated n+1 /Q n Sequentially arranged according to the numerical value and divided into a plurality of sedimentation grades, Q n+1 /Q n The smaller the number, the more severe the piping fouling of this grade.
The invention also provides a system constructed by the method for analyzing the pipeline siltation distribution, the pipeline comprises a main pipe and a plurality of branch pipes connected with the main pipe, the plurality of branch pipes are communicated with the main pipe, a plurality of inspection wells are arranged on the branch pipes at intervals, the depth from the wellhead of each inspection well to the bottom of each well is greater than 2m, and a liquid level meter and/or a flowmeter are arranged in each inspection well.
Preferably, a host device is further arranged on the wall of the inspection well; the ground outside the inspection well is provided with a pit, the bottom of the pit is communicated with the inspection well by a through hole, an antenna is arranged in the pit, and a connector at one end of the antenna penetrates into the inspection well from the through hole; the connector of the antenna, the liquid level meter and/or the flowmeter are electrically connected with the host equipment, the host equipment is also in radio connection with an external platform, and the platform can display data in the inspection well uploaded by the host equipment.
Preferably, the cable of the level gauge and/or the flow meter makes a mark at 1.5m from the probe end measurement, and the mark is on the same horizontal line with the lower surface of the host device.
Preferably, the host device is horizontally arranged on the wall of the inspection well, and the upper surface of the antenna is level with the ground.
Compared with the prior art, the invention has the following beneficial effects:
the invention can realize the purpose of monitoring the pipeline siltation condition by processing, analyzing and calculating the pipeline parameters and the data of the inspection well water level, and provides an economic, safe and efficient method for determining the pipeline dredging period and dredging sequence;
the pipe network water level monitoring technology is mature, and the data precision is high; an Zhuangyun is convenient and can provide continuous data; the overall cost is low;
when the congestion degree is obtained, the method does not need to cut off, does not need harsh implementation conditions, can analyze under the condition of normal operation of a pipe network, and is convenient to implement;
the monitoring data can be stored and accumulated, so that data comparison can be realized, and the effects before and after dredging engineering are implemented can be compared;
of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
FIG. 1 is a longitudinal section view of a full flow pipe fouling site in the method of analyzing pipe fouling distribution according to the present invention;
FIG. 2 is a longitudinal view of a system for analyzing piping fouling profiles according to the present invention;
FIG. 3 is a plan view of a system for analyzing piping fouling profiles according to the present invention;
the marks in the figure: 1-a dry pipe; 2-branch pipes; 3-inspection well; 4-a liquid level meter; a is that Big size -cross-sectional area of piping at sludge-free point, m 2 ；A Small size -cross-sectional area of piping at sludge, m 2 ；v 1 -fluid flow rate in the pipeline at no sludge, m/s; v 2 -fluid flow rate in the pipeline with sludge, m/s.
Detailed Description
The invention will be further illustrated with reference to specific examples. It should be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Modifications and adaptations of the invention will occur to those skilled in the art and are intended to be within the scope of the invention in practice.
The invention will be described in more detail below with reference to the accompanying drawings for better illustration of the invention.
A method of analyzing a pipeline fouling profile comprising the steps of:
s1: acquiring parameters of each drainage pipeline, including pipe length, pipe diameter, pipeline gradient and roughness coefficients; the method comprises the steps of grouping pipelines, wherein the pipelines are connected end to end in a drainage system, the pipelines have the same pipe diameter and unchanged flow, the number of an upstream inspection well of each group of pipelines is marked as n, the number of a downstream pipeline is marked as n+1, the length of a main pipe of an nth group is marked as L, the pipe diameter is marked as d, and the L/d of each group of pipelines is less than 1000 when the pipelines are grouped; installing a liquid level meter on the inspection well at the upstream and downstream of each group of pipelines;
s2: screening and processing water level data to obtain the water level Hn of the inspection well;
s3: according to the state of water flow in the pipeline as full flow pipe or non-full flow pipe, the following hydraulic calculation is carried out:
s31: for a full flow pipe, the water level difference △ H is mainly composed of local head loss H Office (bureau) And the along-path head loss h Edge of the frame Composition in which fouling in the pipe is responsible for local head loss h Office (bureau) The main reason for (a) is that the water level difference between the upstream and downstream inspection wells of the nth group of pipe sections △ Hn， △ Hn＝hn Office (bureau) +hn Edge of the frame According to hn Office (bureau) And hn (hn) Edge of the frame Is determined by the relative size of (a) the fouling condition:
(a) Local head loss hn Office (bureau) <<Loss of along-path head hn Edge of the frame The water level difference before and after the fouling of the nth group of pipelines does not change obviously, and the nth group of pipelines are judged to be difficult to foul;
(b)the nth group of pipes is determined to be easily silted pipes;
s32: for a non-full flow pipe, the Fr number Fr of water flow and the water flow speed v are used for judging the sedimentation condition, and the Fr and v are calculated by the following formula:
and->Wherein:
h represents the water depth of a certain section in the pipeline, and m; n represents a pipeline roughness coefficient; r represents a hydraulic radius, m; i represents the gradient of the pipeline; g represents the acceleration of gravity, m/s 2 ；
The judging method comprises the following steps:
(c) When Fr is more than 1, the water flow in the pipeline is rapid flow, and the probability of occurrence of clogging is low due to the large flow speed, so that the group of pipelines belongs to the pipeline which is not easy to be deposited;
(d) When Fr <1, v >0.6m/s, this set of pipes is the possible presence of fouling pipes;
(e) When Fr <1 and v <0.6m/s, the set of pipes is a fouling prone pipe.
In the step S31The n-th group of pipes is determined to be a pipe susceptible to fouling, there is a fouling,
the method for grading the sludge comprises the following steps:
s3101: along-path head loss h of full flow pipe Edge of the frame Calculated using the darcy-weber formula, the formula is as follows:
h in f For head loss along the journey, i.e. h Edge of the frame The method comprises the steps of carrying out a first treatment on the surface of the d is the diameter of the pipeline, m; l is the length of the pipeline, m; v is the average flow velocity of the cross section of the water, m/s; g is gravity acceleration, m/s 2 The method comprises the steps of carrying out a first treatment on the surface of the Lambda is the coefficient of resistance along the way,c is the Xuetalent coefficient->Wherein n is a pipeline roughness coefficient;
s3102: referring to fig. 1, the group of pipes in which the sludge is located is simplified to a parallel connection of a suddenly reduced pipe and a suddenly enlarged pipe, the local head loss h at the suddenly reduced pipe 1 The following formula is calculated and,
local head loss h at suddenly enlarged pipe 2 The following formula is calculated and,
wherein: a is that Big size To the cross-sectional area of the pipeline at the position without sediment, m 2 ；A Small size For the cross-sectional area of the pipeline where the sludge exists, m 2 ；v 1 Fluid flow rate in the pipeline at the position without sludge, m/s; v 2 The flow velocity of fluid in a pipeline with sludge is m/s;
from the law of conservation of mass it is known that: q=v 1 ×A Big size ＝v 2 ×A Small size ；
And local head loss h Office (bureau) ＝h 1 +h 2 Therefore, it is
Selecting the head and tail of an interval time as the starting time and the ending time, in this embodiment, selecting the time of one year as the starting time and the ending time, respectively obtaining the water level data H of the inspection wells on the upstream and downstream of each group of pipelines of the starting time and the ending time Start n 、H Start n+1 、H Terminal n 、H Terminal n+1 Calculating to obtain the upstream and downstream water level difference h of two time points Starting from the beginning ＝H Start n+1 -H Start n And h Terminal (A) ＝H Terminal n+1 -H Terminal n Local waterHead loss h Office (bureau) ＝H Terminal (A) -H Starting from the beginning Loss of water head along the path h Edge of the frame ＝H Starting from the beginning Therefore, it is
H of the nth group of pipes Start n 、H Start n+1 、H Terminal n 、H Terminal n+1 Substituting d, lambda, L into the above formula to calculate the group
S3103: will be of each groupSequentially arranged according to the numerical value and divided into a plurality of sedimentation grades, +.>The larger the number, the more severe the piping fouling of this grade. Such as +.>After being arranged in order from small to large, the three groups of the water treatment agent are respectively corresponding to three grades and are respectively in serious sedimentation, general sedimentation and slight sedimentation in sequence; of course, it may be classified into two levels, four levels, or more levels as needed.
Further, step S3104 is also included: a pipe network chart is drawn, and different colors are marked on the pipe network chart according to the fouling level of the step S3103.
Further, in the step S2, the screening of the water level data includes: for each inspection well, selecting water level data of a group of water level data curves which are not rainy days and have smooth change and have a fixed period every several days; the processing of the water level data comprises the following steps: and for each group of water level data, removing water level data with large deviation, and then taking an average value to obtain the water level Hn of the inspection well. The every few days herein may be weekly, twenty days, monthly, yearly or other time intervals, without limitation herein.
In other embodiments, the liquid level meter installed in the inspection well is replaced by a flow meter, and other steps are the same as those in the embodiments above, including obtaining the parameters of each drainage pipeline, and grouping the pipelines, including grouping a plurality of pipelines which are connected end to end in the drainage system, have the same pipe diameter and have unchanged flow, wherein the number of the inspection well at the upstream of each group of pipelines is recorded as n, and the number of the pipeline at the downstream is recorded as n+1; and installing flow meters on the inspection wells at the upstream and downstream of each group of pipelines, and respectively recording the values Q of the flow meters in the upstream and downstream inspection wells n 、Q n+1 ；
If Q n+1 /Q n <1, the pipeline of the group is blocked, and Q of each group is calculated n+1 /Q n Sequentially arranged according to the numerical value and divided into a plurality of sedimentation grades, Q n+1 /Q n The smaller the number, the more severe the piping fouling of this grade.
Referring to fig. 2-3, the invention further provides a system constructed by the method for analyzing the sludge distribution of the pipeline, the pipeline comprises a main pipe 1 and a plurality of branch pipes 2 connected with the main pipe 1, the plurality of branch pipes 2 are communicated with the main pipe 1, a plurality of inspection wells 3 are arranged on the branch pipes 2 at intervals, the depth from the wellhead of each inspection well to the bottom of the well is greater than 2m, and a liquid level meter 4 is arranged in each inspection well 3; the level gauge 4 may also be replaced with a flow meter, of course, as desired.
Furthermore, a host device is also arranged on the wall of the inspection well; the ground outside the inspection well is provided with a pit, the bottom of the pit is communicated with the inspection well by a through hole, an antenna is arranged in the pit, and a connector at one end of the antenna penetrates into the inspection well from the through hole; the connector of the antenna, the liquid level meter and/or the flowmeter are electrically connected with the host equipment, the host equipment is also in radio connection with an external platform, and the platform can display data in the inspection well uploaded by the host equipment.
Further, the cable of the liquid level meter and/or the flowmeter makes a mark at the position of 1.5m measured from the probe end, and the mark and the lower surface of the host equipment are on the same horizontal line.
Further, the host device is horizontally arranged on the wall of the inspection well, and the upper surface of the antenna is level with the ground.
The installation of the liquid level meter/flowmeter, the antenna and the host equipment in the embodiment comprises the following steps:
1. mounting preparation
1. Checking whether paint used for marking exists on the well cover, if not, contacting a point-watching person to confirm whether the point is the point position;
2. opening the well cover by using a cross pick after confirmation, waiting for 2 minutes after opening the well cover, and observing whether the conditions in the well meet the following installation conditions:
A. the well wall is firm, can be used for bearing terminal equipment, and the expansion bolts are not easy to loosen;
B. the gas odor in the well is required to be within an acceptable range;
C. if a ladder is arranged in the well, the ladder is confirmed not to interfere with radar measurement data of equipment;
D. the depth from the wellhead to the bottom of the well is more than 2m;
E. equipment can be installed in the water level in the confirmation well, and the distance from the installation position of the terminal to the water surface is at least more than 60cm;
F. installation construction can be performed;
3. when the installation conditions are met, a computer is turned on, a serial port debugging tool is used for testing the field intensity, and the optimal installation point of the antenna is found;
2. mounting step
1. Taking out the equipment from the packaging box, and confirming that the equipment and spare parts are complete and free from damage;
2. plugging all sockets of the host equipment with paper to prevent the sockets from being blocked due to falling of dregs during installation;
3. in the pre-installation position of the antenna, a cylindrical pit with the diameter of 100mm and the depth of 100mm is drilled downwards on the road surface by using a tool, and a through hole with the diameter of not less than 22mm is drilled at the center of the bottom of the pit and is not in the pit for placing the antenna; 4. taking out the antenna, penetrating a connector (without taking down the protective sleeve) at one end of the antenna into the well from the through hole, and placing the antenna in the pit flatly;
5. filling up the space around the upper part and the space around the lower part of the antenna in the pit with a filling material, keeping the surface of the antenna to be level with the ground, cleaning the superfluous filling material on the surface of the antenna, and taking care not to damage an antenna connector during filling up; 6. selecting a drill bit according to the specification of the expansion bolt, and punching holes at a position which is more than 30cm away from a wellhead by using a punching tool according to the hole position distribution condition of the mounting bracket;
7. fixing expansion bolts in each mounting hole, mounting equipment brackets and fastening, wherein the brackets are required to be horizontal to the well wall; 8. a position outside 10cm of the bracket mounting hole is selected to be punched with a fixed expansion hook for fixing the liquid level meter; 9. installing and fastening a host device, wherein the host device also needs to be calibrated to be horizontal by a level meter;
10. making a mark at a position of 1.5m from one end of the probe, and then fixing the liquid level meter on the expansion hook, wherein the mark on the liquid level meter cable and the lower surface (wave-transmitting plate) of the host equipment are required to be ensured to be at the same horizontal line position;
11. if the probe of the liquid level meter is submerged in water, the probe needs to be lifted and placed in the air;
12. taking out the protective sleeve of the antenna connector, and inserting an antenna and a liquid level meter at the corresponding position of the host equipment;
13. placing the antenna cable in the equipment bracket to prevent the cable from hanging to cause loosening of the plug;
14. the distance from the water surface in the well to the lower end of the equipment is measured by using a measuring tool, and then the distance is compared with the data uploaded by a checking terminal on a platform to confirm that the field data are correct, the uploaded data can be quite large,
comparing accuracy of the data acquired after time synchronization;
15. putting the liquid level meter into water;
16. coating waterproof paint on the socket interface;
17. after the installation is finished, the well cover is covered, the cover opening of the well cover is prevented from being over against the equipment as much as possible, the tool is arranged, and whether the terminal normally communicates or not is confirmed again (at least 2 groups of data are needed to be seen from the process of covering the well cover).
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (10)
1. A method of analyzing a pipeline fouling profile, comprising the steps of:
s1: acquiring parameters of each drainage pipeline, including pipe length, pipe diameter, pipeline gradient and roughness coefficients; grouping pipelines, namely grouping a plurality of pipelines which are connected end to end in a drainage system, have the same pipe diameter and have unchanged flow, wherein the number of an upstream inspection well of each group of pipelines is denoted as n, the number of a downstream pipeline is denoted as n+1, the length of a main pipe of an nth group is denoted as L, and the pipe diameter is denoted as d; installing a liquid level meter on the inspection well at the upstream and downstream of each group of pipelines;
s2: screening and processing water level data to obtain the water level Hn of the inspection well;
s3: according to the state of water flow in the pipeline as full flow pipe or non-full flow pipe, the following hydraulic calculation is carried out:
s31: for a full flow pipe, the water level difference △ H is mainly composed of local head loss H Office (bureau) And the along-path head loss h Edge of the frame Composition in which fouling in the pipe is responsible for local head loss h Office (bureau) The main reason for (a) is that the water level difference between the upstream and downstream inspection wells of the nth group of pipe sections △ Hn， △ Hn＝hn Office (bureau) +hn Edge of the frame According to hn Office (bureau) And hn (hn) Edge of the frame Is determined by the relative size of (a) the fouling condition:
(a) Local head loss hn Office (bureau) <<Loss of along-path head hn Edge of the frame Water before and after fouling of the nth group of pipesThe level difference has no obvious change, and the nth group of pipelines are judged to be difficult to pool;
(b)the nth group of pipes is determined to be easily silted pipes;
s32: for a non-full flow pipe, the Fr number Fr of water flow and the water flow speed v are used for judging the sedimentation condition, and the Fr and v are calculated by the following formula:
and->
Wherein: h represents the water depth of a certain section in the pipeline, and m; n represents a pipeline roughness coefficient; r represents a hydraulic radius, m; i represents the gradient of the pipeline; g represents the acceleration of gravity, m/s 2 ；
The judging method comprises the following steps:
(c) When Fr is more than 1, the water flow in the pipeline is rapid flow, and the probability of occurrence of clogging is low due to the large flow speed, so that the group of pipelines belongs to the pipeline which is not easy to be deposited;
(d) When Fr <1 and v >0.6m/s, this set of pipes is the possible presence of fouling pipes;
(e) When Fr <1 and v <0.6m/s, the set of pipes is a fouling prone pipe.
2. The method of analyzing a piping fouling distribution according to claim 1, characterized in that in step S31The n-th group of pipes is determined to be easily fouled pipes, and the presence of a foulant, and the classification of the fouled pipes includes the steps of:
s3101: along-path head loss h of full flow pipe Edge of the frame Calculated using the darcy-weber formula, the formula is as follows:
h in f For head loss along the journey, i.e. h Edge of the frame The method comprises the steps of carrying out a first treatment on the surface of the d is the diameter of the pipeline, m; l is the length of the pipeline, m; v is the average flow velocity of the cross section of the water, m/s; g is gravity acceleration, m/s 2 The method comprises the steps of carrying out a first treatment on the surface of the Lambda is the coefficient of resistance along the way,c is the Xuetalent coefficient->Wherein n is a pipeline roughness coefficient;
s3102: the group of pipes in which the sludge is located is reduced to a parallel connection of a suddenly reduced pipe and a suddenly enlarged pipe, the local head loss h at the suddenly reduced pipe 1 The following formula is calculated and,
local head loss h at suddenly enlarged pipe 2 The following formula is calculated and,
wherein: a is that Big size To the cross-sectional area of the pipeline at the position without sediment, m 2 ；A Small size For the cross-sectional area of the pipeline where the sludge exists, m 2 ；v 1 Fluid flow rate in the pipeline at the position without sludge, m/s; v 2 The flow velocity of fluid in a pipeline with sludge is m/s;
from the law of conservation of mass it is known that: q=v 1 ×A Big size ＝v 2 ×A Small size ；
Selecting the head and tail of an interval time as the starting time and the ending time, and respectively obtaining the starting time and the ending timeWater level data H of inspection wells on the upstream and downstream of each group of pipelines Start n 、H Start n+1 、H Terminal n 、H Terminal n+1 Calculating to obtain the upstream and downstream water level difference h of two time points Starting from the beginning ＝H Start n+1 -H Start n And h Terminal (A) ＝H Terminal n+1 -H Terminal n Local head loss h Office (bureau) ＝H Terminal (A) -H Starting from the beginning Loss of water head along the path h Edge of the frame ＝H Starting from the beginning Therefore, it is
H of the nth group of pipes Start n 、H Start n+1 、H Terminal n 、H Terminal n+1 Substituting d, lambda, L into the above formula to calculate the group
S3103: will be of each groupSequentially arranged according to the numerical value and divided into a plurality of sedimentation grades, +.>The larger the number, the more severe the piping fouling of this grade.
3. The method of analyzing a pipe fouling distribution according to claim 2, further comprising step S3104: a pipe network chart is drawn, and different colors are marked on the pipe network chart according to the fouling level of the step S3103.
4. The method of analyzing a pipe fouling profile according to claim 1, wherein in step S1, L/d <1000 for each group of pipes.
5. The method of analyzing a piping fouling distribution according to claim 1, wherein in said step S2, said screening of water level data comprises: for each inspection well, selecting water level data of a group of water level data curves which are not rainy days and have smooth change and have a fixed period every several days; the processing of the water level data comprises the following steps: and for each group of water level data, removing water level data with large deviation, and then taking an average value to obtain the water level Hn of the inspection well.
6. A method of analysing a pipeline fouling profile according to claim 1, characterised in that the level meter mounted in the manhole is replaced by a flow meter, the value Q of the flow meter in the manhole being recorded separately upstream and downstream n 、Q n+1 If Q n+1 /Q n <1, the pipeline of the group is blocked, and Q of each group is calculated n+1 /Q n Sequentially arranged according to the numerical value and divided into a plurality of sedimentation grades, Q n+1 /Q n The smaller the number, the more severe the piping fouling of this grade.
7. A system constructed by the method for analyzing the fouling distribution of a pipeline according to any one of claims 1 to 6, wherein the pipeline comprises a main pipe and a plurality of branch pipes connected with the main pipe, the plurality of branch pipes are communicated with the main pipe, a plurality of inspection wells are arranged on the branch pipes at intervals, the depth from the wellhead of each inspection well to the bottom of the well is greater than 2m, and a liquid level meter and/or a flowmeter are arranged in each inspection well.
8. The system of claim 7, wherein a host device is further disposed on the wall of the manhole; the ground outside the inspection well is provided with a pit, the bottom of the pit is communicated with the inspection well by a through hole, an antenna is arranged in the pit, and a connector at one end of the antenna penetrates into the inspection well from the through hole; the connector of the antenna, the liquid level meter and/or the flowmeter are electrically connected with the host equipment, the host equipment is also in radio connection with an external platform, and the platform can display data in the inspection well uploaded by the host equipment.
9. The system of claim 8, wherein the cable of the level gauge and/or the flow meter is marked 1.5m from its probe end, the mark being on the same level as the lower surface of the host device.
10. The system of claim 9, wherein the host device is disposed horizontally on a wall of the manhole and the upper surface of the antenna is level with the ground.
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