Coal mine underground coalbed methane extraction pipeline fault automatic diagnosis method

An automatic diagnosis and extraction pipe technology, which is applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problems that the comprehensiveness and accuracy of extraction pipeline fault diagnosis need to be further studied

Active Publication Date: 2020-08-25
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method of judging the failure of the drainage pipeline is a beneficial attempt to the existing technology, but the comprehensiveness and accuracy of the failure diagnosis of the drainage pipeline need to be further studied

Method used

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  • Coal mine underground coalbed methane extraction pipeline fault automatic diagnosis method
  • Coal mine underground coalbed methane extraction pipeline fault automatic diagnosis method
  • Coal mine underground coalbed methane extraction pipeline fault automatic diagnosis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 As shown, the present invention carries out automatic diagnosis of coalbed methane extraction pipeline failure in coal mine, comprising the following steps:

[0042] Step 1, collect the drainage negative pressure and mixed flow values ​​of each measuring point in the drainage pipeline, number them from near to far according to the distance between the measuring points and the pumping station, and record the drainage negative pressure and mixed flow of the i-th measuring point Values ​​are P i , Q i ;

[0043] Step 2: Use the deviation index method to analyze whether there is a fault between the i-th measuring point and the i+1-th measuring point of the drainage pipeline, and determine the type of fault. If the fault type is pipeline leakage, perform step 3, otherwise directly execute Step 4;

[0044] Step 3, using the pipeline air leakage point positioning method to determine the location of the air leakage point between the i-th measuring point and th...

Embodiment 2

[0060] like figure 1 As shown, it is basically the same as Example 1. The different parts are mainly that the method for locating the pipeline air leakage point in step 3 in Embodiment 1 adopts the method for locating the pipeline air leakage point based on the steady-state model.

[0061] like image 3 As shown, the pipeline air leakage point location method in the step 3 adopts the pipeline air leakage point location method based on the steady-state model, and the calculation process of the pipeline air leakage point location method based on the steady-state model is as follows:

[0062] a. Collect the extraction negative pressure value of the i-th measuring point and the i+1-th measuring point at a certain moment;

[0063] b. According to the drainage parameters of the i-th measuring point and the drainage parameters of the i+1-th measuring point, use the following equation to calculate the pipeline length X from the air leakage point to the drainage pump

[0064] h i +...

Embodiment 3

[0072] like figure 1 As shown, it is basically the same as Example 1. The different parts are mainly the method for locating the pipeline air leakage point in step 3 in Embodiment 1. The method for locating the pipeline air leakage point based on the combination of the transient model and the steady state model is adopted.

[0073] like figure 2 As shown, the calculation process of the pipeline air leakage point location method based on the transient model is as follows:

[0074] a. Collect the extraction negative pressure values ​​of the i-th measuring point and the i+1-th measuring point at different times;

[0075] b. Graphing and analyzing the time-course curves of negative pressure extraction at the i-th measuring point and the i+1-th measuring point to find out the sudden change point of the negative pressure. t i , t i+1 ;

[0076] c. Use the following calculation formula to calculate the location of the leak point X s

[0077]

[0078] like image 3 As sho...

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Abstract

The invention discloses a coal mine underground coalbed methane extraction pipeline fault automatic diagnosis method. The coal mine underground coalbed methane extraction pipeline fault automatic diagnosis method comprises the following steps of 1, collecting extraction negative pressure and mixed flow values of each measuring point of an extraction pipeline, numbering the extraction negative pressure and the mixed flow values of the ith measuring point according to the distance from the measuring point to an extraction pump station from near to far, and recording the extraction negative pressure and the mixed flow values of the ith measuring point as Pi and Qi correspondingly; 2, analyzing whether a fault exists between the ith measuring point and the (i + 1) th measuring point of the extraction pipeline or not by adopting a deviation index method, judging the fault type, if the fault type is pipeline leakage, executing the step 3, and otherwise, directly executing the step 4; 3, judging the position of an air leakage point between the ith measuring point and the (i + 1) th measuring point of the extraction pipeline by adopting a pipeline air leakage point positioning method; and4, replacing i with i + 1, and returning to the step 2 to judge the fault type of the next position until i is equal to the number of the last measuring point. The method can effectively solve the problem of low manual detection efficiency of the fault of the underground extraction pipeline of the coal mine, and provides a technical guarantee for the construction of an extraction pipe network intelligent management and control platform.

Description

technical field [0001] The invention relates to an automatic diagnosis method for pipeline faults, in particular to an automatic diagnosis method for coalbed methane extraction pipeline failures in underground coal mines. Background technique [0002] With the extension of my country's coal resource mining to the deep, the content of coalbed methane is gradually increasing. Considering the safe mining of coal and the effective utilization of resources, the development of coalbed methane in coal mining areas has become a strategic issue that needs to be solved urgently by the country. The development of underground coalbed methane at home and abroad relies on drainage systems. Due to problems such as corrosion perforation, fatigue cracking, and external damage, drainage pipeline failures occur from time to time, which not only affects the drainage efficiency, but also poses a threat to production safety. At present, manual methods are mostly used for fault detection of gas dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/02
CPCF17D5/02F17D5/005
Inventor 张慧杰霍中刚舒龙勇张毅斌张浪李伟安赛叶锦娇刘永茜汪东范喜生张志荣王维华潘铁柱郭建行朱南南
Owner CCTEG CHINA COAL RES INST
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