A method of maintaining rectifier column straightness

Abstract

The application relates to a rectifying tower straightness keeping method and relates to the technical field of rectifying tower design. The application comprises the following steps: obtaining historical straightness detection process data and current straightness detection process data of a rectifying tower body; preprocessing the historical straightness detection process data of the rectifying tower body to obtain a training sample set; inputting the training sample set into a neural network model, training the neural network model, and obtaining a straightness analysis model; inputting the current straightness detection process data of the rectifying tower body into the straightness analysis model as a test sample set to obtain straightness deviation degree data; comparing the straightness deviation degree data with a deviation threshold value; and according to a comparison result, adjusting processing parameters of the rectifying tower body to complete rectifying tower straightness correction. The application effectively improves the measurement efficiency and precision of rectifying tower body straightness error and is beneficial to rectifying tower body product quality monitoring.

Description

Technical Field

[0001] This invention relates to the field of distillation column design technology, specifically a method for maintaining the straightness of a distillation column. Background Technology

[0002] A distillation column is a tower-type vapor-liquid contact device used for distillation. It utilizes the different volatility of the components in a mixture—that is, the different vapor pressures of the components at the same temperature—to separate the lighter components (low-boiling-point substances) from the liquid phase into the vapor phase, while the heavier components (high-boiling-point substances) from the vapor phase into the liquid phase, thus achieving separation. Distillation columns are tall structures, and controlling their straightness to minimize bending stress is essential for safe operation and crucial for product quality.

[0003] Therefore, to address the above problems, it is necessary to explore a method for maintaining the straightness of the distillation column. Summary of the Invention

[0004] The main objective of this invention is to provide a method for maintaining the straightness of a distillation column to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides a method for maintaining the straightness of a distillation column, comprising the following steps:

[0006] S1, acquire historical straightness detection process data and current straightness detection process data of the distillation column body;

[0007] S2, preprocess the historical straightness detection process data of the distillation column body to obtain the training sample set;

[0008] S3, input the training sample set into the neural network model, train the neural network model, and obtain the straightness analysis model;

[0009] S4. Use the current straightness detection process data of the distillation column body as a test sample set and input it into the straightness analysis model to obtain the straightness deviation data;

[0010] S5 compares the straightness deviation data with the deviation threshold, and adjusts the processing parameters of the distillation column body according to the comparison results to complete the straightness correction of the distillation column.

[0011] Furthermore, the method for acquiring straightness detection process data is as follows: the geometric curve of the surface of the distillation column is measured and a position information dataset is obtained.

[0012] Furthermore, positional information is collected by moving along a spiral curve at fixed intervals from left to right. A three-dimensional rectangular coordinate system is established with the center point of the left end face as the center O, the axis along the distillation column body through the center O as the x-axis, the vertical direction perpendicular to the x-axis through the center as the y-axis, and the direction on the paper perpendicular to the x-axis through the center as the z-axis. This yields a series of coordinate points (x, y, z) on the surface of the distillation column body in the corresponding coordinate system. i ,y i ,z i );

[0013] Where, x i y represents the horizontal distance from point i to the center O of the circle. i z represents the vertical distance from point i to the center O of the circle. i Let i represent the distance from the i-th point to the center O of the circle on the paper, where i = 1, 2, ..., n.

[0014] Furthermore, the method for preprocessing the historical straightness detection data of the distillation column body is as follows:

[0015] The unstructured data in the historical straightness detection process data of the distillation column body is converted into structured data; the structured data is clustered according to the preprocessing matching library to obtain clustered data; after data standardization, data union and data cleaning of the clustered data, the preprocessed dataset is obtained, which is the training sample set.

[0016] Furthermore, the method for obtaining data on the degree of straight-line deviation is as follows:

[0017] Based on the profile curve of the distillation column, by searching x i The extreme value of y-axis of the distillation column profile at the location imax With z-axis extreme value z imax Compare with the actual reference value y of the laser line i0 With z i0 Then we get x i Straightness error of the distillation column profile at the location:

[0018] y id =|y imax -y i0 |

[0019] z id =|z imax -z i0 |

[0020] Take max(y) id ,z id ) as x i The straightness error of the distillation column profile at the location.

[0021] Furthermore, the straightness error of the distillation column profile is calculated point by point, when xi When the straightness error of the distillation column body profile at the location is greater than or equal to the first threshold, the processing parameters of the distillation column body are adjusted to adjust the straightness.

[0022] When x i If the straightness error of the distillation column body profile at the location is less than the first threshold and greater than or equal to the second threshold, a second straightness deviation data acquisition is performed; if the straightness error is less than the second threshold, the straightness of the tested distillation column is deemed to be qualified; otherwise, the processing parameters of the distillation column body are adjusted to adjust the straightness.

[0023] When the second threshold is less than the first threshold;

[0024] When x i If the straightness error of the distillation column body profile at the location is less than the second threshold, the straightness of the distillation column being tested is deemed to be qualified.

[0025] Furthermore, adjusting the processing parameters of the distillation column body to adjust the straightness includes: adjusting the processing parameters of the distillation column body to perform the first straightness adjustment, checking the straightness error of the distillation column body profile again, and determining whether the straightness adjustment is successful. If the straightness adjustment is successful, the straightness adjustment ends; if the straightness adjustment is not successful, the Nth straightness adjustment is performed, where N≥2 and N is a natural number, until the straightness adjustment is successful.

[0026] The beneficial effects of this invention are as follows:

[0027] This invention provides a method for maintaining the straightness of a distillation column. It preprocesses historical straightness testing data of the distillation column body, processing the coordinate values ​​of all data points to reliably remove outlier data points and ensure the accuracy of data acquisition. By inputting the test sample set into a straightness analysis model, it can accurately obtain data on the degree of straightness deviation, achieving non-contact, full-circumference online measurement and improving measurement accuracy to meet the production and testing needs of the distillation column body. This effectively improves the measurement efficiency and accuracy of the straightness error of the distillation column body, which is beneficial for monitoring the product quality of the distillation column body. Attached Figure Description

[0028] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0029] To achieve the above objectives and effects, the technical means and structure adopted by the present invention will be described in detail with reference to the accompanying drawings, focusing on the features and functions of the preferred embodiments of the present invention.

[0030] like Figure 1 As shown, the present invention provides a method for maintaining the straightness of a distillation column, comprising the following steps:

[0031] S1, acquire historical straightness detection process data and current straightness detection process data of the distillation column body;

[0032] S2, preprocess the historical straightness detection process data of the distillation column body to obtain the training sample set;

[0033] S3, input the training sample set into the neural network model, train the neural network model, and obtain the straightness analysis model;

[0034] S4. Use the current straightness detection process data of the distillation column body as a test sample set and input it into the straightness analysis model to obtain the straightness deviation data;

[0035] S5 compares the straightness deviation data with the deviation threshold, and adjusts the processing parameters of the distillation column body according to the comparison results to complete the straightness correction of the distillation column.

[0036] In this embodiment, the method for acquiring straightness detection process data is as follows: the geometric curve of the surface of the distillation column is measured and a position information dataset is obtained.

[0037] In this embodiment, position information is collected by moving along a spiral curve at fixed intervals from left to right. The center point of the left end face is taken as the center O, the axis along the distillation column body through the center O is taken as the x-axis, the vertical direction perpendicular to the x-axis through the center is taken as the y-axis, and the direction perpendicular to the x-axis through the center is taken as the z-axis. A three-dimensional rectangular coordinate system is established, and a series of coordinate points (x, y, z) on the surface of the distillation column body are obtained in the corresponding coordinate system. i ,y i ,z i );

[0038] Where, x i y represents the horizontal distance from point i to the center O of the circle. i z represents the vertical distance from point i to the center O of the circle. i Let i represent the distance from the i-th point to the center O of the circle on the paper, where i = 1, 2, ..., n.

[0039] In this embodiment, the method for preprocessing the historical straightness detection process data of the distillation column is as follows: unstructured data in the historical straightness detection process data of the distillation column is converted into structured data; clustering of the structured data is performed according to a preprocessing matching library to obtain clustered data; after data standardization, data union, and data cleaning of the clustered data, the preprocessed dataset is obtained, which is the training sample set. By using the data preprocessing method of this embodiment to filter out outlier data points, the obtained data points are more convenient for subsequent fitting and calculation.

[0040] In this embodiment, the method for obtaining the straight line deviation data is as follows:

[0041] Based on the contour curve of the distillation column body, by searching for the y-axis extreme value y i and the z-axis extreme value z imax at the x imax position of the contour of the distillation column body, comparing with the actual reference values y i0 and z i0 of the laser line, the straightness error of the contour of the distillation column body at the x i position can be obtained:

[0042] y id = |y imax - y i0 |

[0043] z id = |z imax - z i0 |

[0044] Take max(y id , z id ) as the straightness error of the contour of the distillation column body at the x i position.

[0045] The surface of the distillation column body of the present invention has a better contour effect. By taking values based on the contour curve, the accuracy of the measurement of the straightness deviation data is ensured; only a laser device is required in the whole measurement process, which is easy to install, and the implementation and maintenance costs are relatively low; it breaks the orthopedic mode relying on manual experience, improves the orthopedic efficiency and the consistency of orthopedic quality, realizes the digital orthopedic of the distillation column body, and supports the intelligent manufacturing of construction machinery products; the new processing parameters can not only be matched from the orthopedic process database, but also can be calculated and obtained on the mobile terminal according to the deformation amount of the distillation column body on site, saving the manual orthopedic calculation time and the repeated orthopedic time, and greatly improving the work efficiency. After the orthopedic is completed, the straightness of the drill mast is rechecked. If the processing parameters are adopted, they will be recorded on the mobile terminal and saved to the orthopedic process database by the industrial Internet.

[0046] In this embodiment, the straightness error of the contour of the distillation column body is calculated point by point. When the straightness error of the contour of the distillation column body at the x i position is greater than or equal to the first threshold, the processing parameters of the distillation column body are adjusted for straightness adjustment; when the straightness error of the contour of the distillation column body at the x i position is less than the first threshold and greater than or equal to the second threshold, the second straightness deviation data is obtained; if the straightness error is less than the second threshold, it is determined that the straightness of the detected distillation column is qualified; otherwise, the processing parameters of the distillation column body are adjusted for straightness adjustment; when the second threshold is less than the first threshold; when the straightness error of the contour of the distillation column body at the x i position is less than the second threshold, it is determined that the straightness of the detected distillation column is qualified.

[0047] In this embodiment, adjusting the processing parameters of the distillation column body to adjust the straightness includes: adjusting the processing parameters of the distillation column body to perform the first straightness adjustment, detecting the straightness error of the distillation column body outline again, and determining whether the straightness adjustment is successful. If the straightness adjustment is successful, the straightness adjustment ends; if the straightness adjustment is not successful, the Nth straightness adjustment is performed, where N≥2 and N is a natural number, until the straightness adjustment is successful.

[0048] The method for adjusting the straightness of the distillation column body involves re-inspecting the straightness of the target section after the first straightness adjustment to obtain an accurate assessment of the current straightness deviation of the target section. Based on the deviation, it is determined whether the straightness adjustment of the pultruded plate target section was successful. If unsuccessful, the direction of the straightness deviation of the target section is analyzed again and the straightness adjustment is performed again. This method prevents missed inspections and ensures the pass rate of the distillation column body.

[0049] The distillation column body is actually processed according to the compensated processing parameters, which simplifies the subsequent manual rework and operation steps of the distillation column body, saves time, improves efficiency, and makes it possible to achieve successful assembly in one go. It ensures that the geometric accuracy of the distillation column body is within the expected index range, and can meet the requirements of high efficiency, high precision and batch assembly of different types of distillation columns.

[0050] This invention provides a method for maintaining the straightness of a distillation column. It preprocesses historical straightness testing data of the distillation column body, processing the coordinate values ​​of all data points to reliably remove outlier data points and ensure the accuracy of data acquisition. By inputting the test sample set into a straightness analysis model, it can accurately obtain data on the degree of straightness deviation, achieving non-contact, full-circumference online measurement and improving measurement accuracy to meet the production and testing needs of the distillation column body. This effectively improves the measurement efficiency and accuracy of the straightness error of the distillation column body, which is beneficial for monitoring the product quality of the distillation column body.

[0051] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for maintaining the straightness of a distillation column, characterized in that, Includes the following steps: S1, acquire historical straightness detection process data and current straightness detection process data of the distillation column body; The method for acquiring data in the straightness detection process is as follows: measure the geometric curve of the surface of the distillation column and obtain a dataset of position information; Position information is collected by moving along a spiral curve at fixed intervals from left to right. A three-dimensional rectangular coordinate system is established with the center point of the left end face as the center O, the axis along the distillation column body through the center O as the x-axis, the vertical direction perpendicular to the x-axis through the center as the y-axis, and the direction on the paper perpendicular to the x-axis through the center as the z-axis. A series of coordinate points on the surface of the distillation column body are obtained in the corresponding coordinate system. ; in, Indicates the first The horizontal distance from the point to the center O of the circle, Indicates the first The vertical distance from the point to the center O of the circle. Indicates the first The distance from the point to the center O on the paper. =1,2,…,n; S2, preprocess the historical straightness detection process data of the distillation column body to obtain the training sample set; S3, input the training sample set into the neural network model, train the neural network model, and obtain the straightness analysis model; S4. Use the current straightness detection process data of the distillation column body as a test sample set and input it into the straightness analysis model to obtain the straightness deviation data; The method for obtaining straight line deviation data is as follows: Based on the profile curve of the distillation column, by searching The extreme values ​​of the y-axis of the distillation column profile at the location z-axis extreme values Compare with the actual reference value of the laser line and Then obtain Straightness error of the distillation column profile at the location: Take max( As The straightness error of the distillation column profile at the location; S5. Compare the straightness deviation data with the deviation threshold, and adjust the processing parameters of the distillation column body according to the comparison results to complete the straightness correction of the distillation column. Calculate the straightness error of the distillation column profile point by point, when When the straightness error of the distillation column body profile at the location is greater than or equal to the first threshold, the processing parameters of the distillation column body are adjusted to adjust the straightness. when If the straightness error of the distillation column body profile at the location is less than the first threshold and greater than or equal to the second threshold, a second straightness deviation data acquisition is performed; if the straightness error is less than the second threshold, the straightness of the tested distillation column is deemed to be qualified; otherwise, the processing parameters of the distillation column body are adjusted to adjust the straightness. When the second threshold is less than the first threshold; when If the straightness error of the distillation column body profile at the location is less than the second threshold, the straightness of the distillation column being tested is deemed to be qualified.

2. The method for maintaining the straightness of a distillation column as described in claim 1, characterized in that, The method for preprocessing the historical straightness detection data of the distillation column body is as follows: The unstructured data in the historical straightness detection process data of the distillation column body is converted into structured data; the structured data is clustered according to the preprocessing matching library to obtain clustered data; after data standardization, data union and data cleaning of the clustered data, the preprocessed dataset is obtained, which is the training sample set.

3. The method for maintaining the straightness of a distillation column as described in claim 2, characterized in that, Adjusting the processing parameters of the distillation column body to achieve straightness adjustment includes: adjusting the processing parameters of the distillation column body to perform the first straightness adjustment; then checking the straightness error of the distillation column body profile again to determine whether the straightness adjustment is successful. If the straightness adjustment is successful, the straightness adjustment ends; if the straightness adjustment is not successful, the Nth straightness adjustment is performed, where N≥2 and N is a natural number, until the straightness adjustment is successful.

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