Method for correcting the clean water delivery head characteristic curve of a dredge pump

Abstract

The application discloses a method for correcting the clean water lift characteristic curve of a dredge pump of a trailing suction hopper dredger, comprising the following steps: S1, collecting recent construction parameter data of the trailing suction hopper dredger; S2, collecting pipeline and dredge pump related data of the trailing suction hopper dredger; S3, correcting the time difference between the change of the slurry density and the slurry flow rate in the recent construction parameter data; S4, calculating the actual clean water lift of the dredge pump; and S5, fitting to obtain a new clean water lift characteristic curve of the dredge pump. The application solves the problem that the original clean water lift characteristic curve of the dredge pump changes when the dredge pump is used for a long time, so that the construction working condition point of the dredge pump and various related construction process parameters cannot be accurately calculated, and the trailing suction hopper dredger cannot be guided to be scientifically and effectively constructed.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy and waterway engineering construction technology, specifically a method for correcting the clear water head characteristic curve of a trailing suction hopper dredger mud pump. Background Technology

[0002] In existing technologies, the clear water head characteristic curve of a mud pump reflects the relationship between the mud pump head and the water flow velocity. It is an essential curve for calculating the mud pump's operating conditions and various related construction process parameters. During long-term dredging operations, the mud pump's internal structure will deform and wear after prolonged operation, causing changes in the original clear water head characteristic curve when the mud pump leaves the factory. This means that the original clear water head characteristic curve can no longer accurately calculate the mud pump's operating conditions and various related construction process parameters, resulting in reduced construction efficiency, increased costs, and ineffective scientific construction by the trailing suction hopper dredger.

[0003] Therefore, in order to accurately calculate the working conditions of the mud pump and various related construction process parameters, and to guide the scientific and effective construction of the trailing suction hopper dredger, a method for correcting the clear water head characteristic curve of the mud pump of the trailing suction hopper dredger is provided. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention provides a method for correcting the clear water head characteristic curve of a trailing suction hopper dredger pump. This method solves the problem that in the prior art, the original clear water head characteristic curve of the dredger pump changes after long-term operation, making it impossible to accurately calculate the dredger's operating conditions and various related construction process parameters, and thus failing to guide the scientific and effective construction of the trailing suction hopper dredger.

[0005] The technical solution to achieve the above objectives is: A method for correcting the clear water head characteristic curve of a trailing suction hopper sludge pump includes: Step S1: Collect recent construction parameter data of the trailing suction hopper dredger; Step S2: Collect relevant data on the trailing suction hopper's pipes and mud pumps; Step S3: Correct the time difference between the changes in mud density and mud flow rate in recent construction parameter data; Step S4: Calculate the actual clean water head of the mud pump; Step S5: Fit the new mud pump clean water head characteristic curve.

[0006] Preferably, in step S1, the collected historical construction data of the trailing suction hopper dredger includes: water density. Mud density Natural soil density Slurry flow rate in the mud pump outlet pipe Mud pump speed Mud pump draws in vacuum Mud pump discharge pressure The data is collected through the data collection system on the trailing suction hopper vessel, with a data collection interval of 2 seconds.

[0007] Preferably, in step S1, the densitometer and flow meter for collecting the construction parameter data of the trailing suction hopper are installed on the pipeline behind the mud pump outlet of the trailing suction hopper. in, The vacuum gauge is installed at the mud pump inlet, and the discharge pressure gauge is installed at the mud pump outlet. Since the densitometer is installed far from the rake head, the data measured by the flow meter and vacuum gauge at the same time point are the mud flow velocity and vacuum in the pipeline at that time point. The changes in mud flow velocity and vacuum in the pipeline at that time point are related to the changes in mud density at the rake head position. The data measured by the densitometer is the density of the mud in the pipe at the densitometer installation location. The mud density at the rake head location at this point in time can only be measured after the mud has traveled for a certain period of time to reach the pipe at the densitometer installation location. The time required for the mud to travel from the rake head location to the pipe at the densitometer installation location is the time difference between the changes in mud density and mud flow rate in the construction parameter data.

[0008] Preferably, in step S2, the collected data related to the trailing suction hopper's pipes and mud pumps includes: the inner diameter of the trailing suction hopper pipe. Inner diameter of mud pump outlet pipe The length of the pipe from the rake head to the center of the mud pump The length of the pipe from the center of the mud pump to the density meter Vertical height from vacuum gauge to pressure gauge .

[0009] Preferably, in step S3, correcting the time difference between the changes in mud density and mud flow velocity in the construction parameter data includes: According to the inner diameter of the suction hopper pipe of the trailing suction hopper vessel Inner diameter of mud pump outlet pipe Slurry flow rate at the mud pump outlet Calculate the mud flow velocity in the mud pump suction pipe. : ; The data collection interval for construction parameters is 2 seconds. The distance the mud travels in the pipeline between the rake head and the center of the mud pump every 2 seconds is... The distance the pipeline travels from the center of the mud pump to the installation position of the density meter is ; Let the first Data collection time to the 1st During the second data collection, the mud moved from the rake head position to the center of the mud pump, and the distance traveled was the length of the pipe from the rake head to the mud pump. , No. Data collection time to the 1st During the second data collection, the mud moved from the center of the mud pump to the location where the density meter was installed, and the distance it moved was the length of the pipe from the center of the mud pump to the density meter. At this point, the density value measured by the mud densitometer is recorded on the [number]th [day]. Therefore, when continuously from the data collected in the second time, Next to When the collected construction parameter data satisfies the following relationship: ; The first The mud density value from the second data collection was replaced with the value from the first data collection. The data was collected in the second round, and then the first round was corrected. The time difference between the changes in mud density and mud flow velocity during each data collection.

[0010] Preferably, in step S4, calculating the actual clean water head of the mud pump includes: Calculate the mud pump head using the following formula. : ; In the formula, It is the acceleration due to gravity. The corrected mud density is defined in step S3. Calculate the mud pump head The corresponding mud pump clean water head : ; In the formula, This is the soil particle size coefficient; when the soil is silt, Take 0 when the soil is silty soil. Take 0.03 when the soil is silty sand. Take 0.05 when the soil is fine sand. Take 0.10, when the soil is medium sand. Take 0.27, when the soil is coarse sand. Take 0.42, when the soil is gravel. Take 0.75.

[0011] Preferably, in step S5, the least squares method is used to fit the head of the mud pump for clear water. Mud flow rate at the mud pump outlet The functional relationship between them yields a new mud pump clear water head characteristic curve.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention solves the problem that in the prior art, during long-term dredging operations, the internal structure of the mud pump of a trailing suction hopper dredger will deform and wear after long-term operation, resulting in a change in the original clear water head characteristic curve of the mud pump when it leaves the factory. As a result, it is impossible to accurately calculate the mud pump's operating point and various related construction process parameters using the original clear water head characteristic curve, and thus cannot guide the scientific and effective construction of the trailing suction hopper dredger. The present invention has positive significance for improving the accuracy of the calculation results of the mud pump's operating point and various related construction process parameters, improving the construction efficiency of the trailing suction hopper dredger, reducing the construction cost of the trailing suction hopper dredger, and ensuring the scientific and effective construction of the trailing suction hopper dredger. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of a method for correcting the clear water head characteristic curve of a trailing suction hopper dredger mud pump according to the present invention; Figure 2 This is a schematic diagram showing the installation locations of various devices for collecting construction parameter data in this invention. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, a method for correcting the clear water head characteristic curve of a trailing suction hopper sludge pump includes: Step S1: Collect recent construction parameter data of the trailing suction hopper dredger.

[0016] In this embodiment, the collected historical construction data of the trailing suction hopper dredger includes: water density. Mud density Natural soil density Slurry flow rate in the mud pump outlet pipe Mud pump speed Mud pump draws in vacuum Mud pump discharge pressure The data is collected through the data collection system on the trailing suction hopper vessel, with a data collection interval of 2 seconds.

[0017] like Figure 2As shown, the densitometer and flow meter for collecting construction parameter data of the trailing suction hopper are installed on the pipeline behind the mud pump outlet of the trailing suction hopper. in, The vacuum gauge is installed at the mud pump inlet, and the discharge pressure gauge is installed at the mud pump outlet. Since the densitometer is installed far from the rake head, the data measured by the flow meter and vacuum gauge at the same time point are the mud flow velocity and vacuum in the pipeline at that time point. The changes in mud flow velocity and vacuum in the pipeline at that time point are related to the changes in mud density at the rake head position. The data measured by the densitometer is the density of the mud in the pipe at the densitometer installation location. The mud density at the rake head location at this point in time can only be measured after the mud has traveled for a certain period of time to reach the pipe at the densitometer installation location. The time required for the mud to travel from the rake head location to the pipe at the densitometer installation location is the time difference between the changes in mud density and mud flow rate in the construction parameter data.

[0018] Step S2: Collect relevant data on the trailing suction hopper's pipes and mud pumps.

[0019] In this embodiment, the collected data related to the trailing suction hopper's pipes and mud pumps includes: the inner diameter of the trailing suction hopper pipe. Inner diameter of mud pump outlet pipe The length of the pipe from the rake head to the center of the mud pump The length of the pipe from the center of the mud pump to the density meter Vertical height from vacuum gauge to pressure gauge .

[0020] Step S3: Correct the time difference between the changes in mud density and mud flow rate in recent construction parameter data.

[0021] In this embodiment, correcting the time difference between changes in mud density and mud flow velocity in the construction parameter data includes: According to the inner diameter of the suction hopper pipe of the trailing suction hopper vessel Inner diameter of mud pump outlet pipe Slurry flow rate at the mud pump outlet Calculate the mud flow velocity in the mud pump suction pipe. : ; The data collection interval for construction parameters is 2 seconds. The distance the mud travels in the pipeline between the rake head and the center of the mud pump every 2 seconds is... The distance the pipeline travels from the center of the mud pump to the installation position of the density meter is ; Let the first Data collection time to the 1st During the second data collection, the mud moved from the rake head position to the center of the mud pump, and the distance traveled was the length of the pipe from the rake head to the mud pump. , No. Data collection time to the 1st During the second data collection, the mud moved from the center of the mud pump to the location where the density meter was installed, and the distance it moved was the length of the pipe from the center of the mud pump to the density meter. At this point, the density value measured by the mud densitometer is recorded on the [number]th [day]. Therefore, when continuously from the data collected in the second time, Next to When the collected construction parameter data satisfies the following relationship: ; The first The mud density value from the second data collection was replaced with the value from the first data collection. The data was collected in the second round, and then the first round was corrected. The time difference between the changes in mud density and mud flow velocity during each data collection.

[0022] Step S4: Calculate the actual clean water head of the mud pump.

[0023] In this embodiment, calculating the actual clean water head of the mud pump includes: Calculate the mud pump head using the following formula. : ; In the formula, It is the acceleration due to gravity. The corrected mud density is shown in step S3. Calculate the mud pump head The corresponding mud pump clean water head : ; In the formula, This is the soil particle size coefficient; when the soil is silt, Take 0 when the soil is silty soil. Take 0.03 when the soil is silty sand. Take 0.05 when the soil is fine sand. Take 0.10, when the soil is medium sand. Take 0.27, when the soil is coarse sand. Take 0.42, when the soil is gravel. Take 0.75.

[0024] Step S5: Fit the new mud pump clean water head characteristic curve.

[0025] In this embodiment, the least squares method is used to fit the head of the mud pump for clear water. Mud flow rate at the mud pump outlet The functional relationship between them yields a new mud pump clear water head characteristic curve.

[0026] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for correcting the clear water head characteristic curve of a trailing suction hopper sludge pump, characterized in that, include: Step S1: Collect recent construction parameter data of the trailing suction hopper dredger; Step S2: Collect relevant data on the trailing suction hopper's pipes and mud pumps; Step S3: Correct the time difference between the changes in mud density and mud flow rate in recent construction parameter data; Correcting the time difference between changes in mud density and mud flow velocity in construction parameter data, including: According to the inner diameter of the suction hopper pipe of the trailing suction hopper vessel Inner diameter of mud pump outlet pipe Slurry flow rate at the mud pump outlet Calculate the mud flow velocity in the mud pump suction pipe. : ； The data collection interval for construction parameters is 2 seconds. The distance the mud travels in the pipeline between the rake head and the center of the mud pump every 2 seconds is... The distance the pipeline travels from the center of the mud pump to the installation position of the density meter is ; Let the first Data collection time to the 1st During the second data collection, the mud moved from the rake head position to the center of the mud pump, and the distance traveled was the length of the pipe from the rake head to the mud pump. , No. Data collection time to the 1st During the second data collection, the mud moved from the center of the mud pump to the location where the density meter was installed, and the distance it moved was the length of the pipe from the center of the mud pump to the density meter. At this point, the density value measured by the mud densitometer is recorded on the [number]th [day]. Therefore, when continuously from the data collected in the second time, Next to When the collected construction parameter data satisfies the following relationship: ； The first The mud density value from the second data collection was replaced with the value from the first data collection. The data was collected in the second round, and then the first round was corrected. The time difference between the changes in mud density and mud flow velocity during the second data collection; Step S4: Calculate the actual clean water head of the mud pump; Calculate the actual clean water head of the mud pump, including: Calculate the mud pump head using the following formula. : ； In the formula, It is the acceleration due to gravity. The corrected mud density is defined in step S3. Calculate the mud pump head The corresponding mud pump clean water head : ； In the formula, This is the soil particle size coefficient; when the soil is silt, Take 0 when the soil is silty soil. Take 0.03 when the soil is silty sand. Take 0.05 when the soil is fine sand. Take 0.10, when the soil is medium sand. Take 0.27, when the soil is coarse sand. Take 0.42, when the soil is gravel. Take 0.75; Step S5: Fit the new mud pump clean water head characteristic curve; The least squares method was used to fit the head of the mud pump for clear water. Mud flow rate at the mud pump outlet The functional relationship between them yields a new mud pump clear water head characteristic curve.

2. The method for correcting the clear water head characteristic curve of a trailing suction hopper sludge pump according to claim 1, characterized in that, In step S1, the collected historical construction data of the trailing suction hopper dredger includes: water density. Mud density Natural soil density Slurry flow rate in the mud pump outlet pipe Mud pump speed Mud pump draws in vacuum Mud pump discharge pressure The data is collected through the data collection system on the trailing suction hopper vessel, with a data collection interval of 2 seconds.

3. The method for correcting the clear water head characteristic curve of a trailing suction hopper sludge pump according to claim 2, characterized in that, In step S1, a densitometer and a flow meter for collecting construction parameter data of the trailing suction hopper are installed on the pipeline behind the mud pump outlet of the trailing suction hopper. in, The vacuum gauge is installed at the mud pump inlet, and the discharge pressure gauge is installed at the mud pump outlet. Since the densitometer is installed far from the rake head, the data measured by the flow meter and vacuum gauge at the same time point are the mud flow velocity and vacuum in the pipeline at that time point. The changes in mud flow velocity and vacuum in the pipeline at that time point are related to the changes in mud density at the rake head position. The data measured by the densitometer is the density of the mud in the pipe at the densitometer installation location. The mud density at the rake head location at this point in time can only be measured after the mud has traveled for a certain period of time to reach the pipe at the densitometer installation location. The time required for the mud to travel from the rake head location to the pipe at the densitometer installation location is the time difference between the changes in mud density and mud flow rate in the construction parameter data.

4. The method for correcting the clear water head characteristic curve of a trailing suction hopper sludge pump according to claim 2, characterized in that, In step S2, the collected data related to the trailing suction hopper's pipes and mud pumps includes: the inner diameter of the trailing suction hopper pipe. Inner diameter of mud pump outlet pipe The length of the pipe from the rake head to the center of the mud pump The length of the pipe from the center of the mud pump to the density meter Vertical height from vacuum gauge to pressure gauge .

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