CN111612258A - Method for judging and identifying gas abnormality by using gas desorption quantity characteristics - Google Patents
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Abstract
The invention discloses a method for judging and identifying gas abnormality by using gas desorption quantity characteristics, which comprises the following steps: s1, determining the ratio W of the maximum gas desorption variation in k minutes to the total gas emission amountj,k(ii) a S2, determining the maximum gas desorption change in m minutesRatio W of volume to total gas emission volumej,m(ii) a S3, determining the ratio S of the maximum gas desorption variation in k minutes to the maximum gas desorption variation in m minutesj,k,m(ii) a S4, determining the ratio T of the maximum value in the k-minute moving average sequence to the maximum value in the m-minute moving average sequencej,k,m(ii) a S5, if the total gas emission amount does not tend to 0, carrying out the next step; s6. if Wj,kNot tend to be 0 or Wj,mNot tending to 0 or Sj,k,mIs not prone to
Or Tj,k,mIf the trend is not 1, the next step is carried out; s7, if Wj,k、Wj,m、Sj,k,m、Tj,k,mIf at least one of the two is larger, the gas will flow out abnormally. The method for judging and identifying the gas abnormity by using the gas desorption quantity characteristics can accurately judge and identify whether the gas emission is abnormal or not, and has the advantages of good judgment and identification effect, wide application range and low investment cost.
Description
Technical Field
The invention relates to the field of gas emission, in particular to a method for judging and identifying gas abnormity by using gas desorption quantity characteristics.
Background
The coal sample is positioned in the original coal body, when the gas pressure of the coal sample is equal to the gas pressure of the original coal body, the free gas and the adsorbed gas in the coal sample are in a dynamic balance state, once the balance state is damaged, the gas adsorbed in the coal starts to be desorbed, the gas is released, and the phenomenon of gas emission also occurs; the gas emission quantity has important influence on the mining of the mine, and particularly, the judgment on whether the gas emission is abnormal or not has great significance on the safe production of the mine.
At present, a plurality of methods for judging and identifying the gas emission abnormity of the working surface exist, but some of the methods have low accuracy, limited application range, difficult implementation and high input cost.
Therefore, in order to solve the above problems, a method for identifying gas abnormality by using a gas desorption quantity characteristic is needed, whether gas emission is abnormal or not can be accurately identified, the identification effect is good, the application range is wide, the input cost is low, and a foundation is laid for realizing advanced early warning.
Disclosure of Invention
In view of the above, the present invention provides a method for identifying abnormal gas emission by using a characteristic of gas desorption amount, which can accurately identify whether the gas emission is abnormal, and has the advantages of good identification effect, wide application range, and low investment cost.
The method for judging and identifying gas abnormality by using the gas desorption quantity characteristics comprises the following steps:
s1, determining the maximum gas desorption variable quantity Q in k minutes in the jth shiftj,kRatio W to the total gas emission of shift jj,k(ii) a Wherein, the
N·Xj,aveIs the total gas emission amount of the jth shift, N is the total minutes of the shift, Xj,aveThe average value of the gas emission concentration per minute of the jth shift is j, and j is the shift number;
s2, determining the maximum gas desorption variable quantity Q in m minutes in the jth shiftj,mRatio W to the total gas emission of shift jj,m(ii) a Wherein, the
S3, determining the maximum gas desorption variable quantity Q in k minutes in the jth shiftj,kMaximum gas desorption variation Q within m minutes of the jth shiftj,mRatio S betweenj,k,m(ii) a Wherein, the
S4, determining the maximum value X in the k-minute moving average value sequence in the jth shiftj,k,ave,maxAnd the maximum value X in the m-minute moving average sequence in the jth shiftj,m,ave,maxRatio of T betweenj,k,m(ii) a Wherein, the
S5, judging whether the total gas emission amount of the jth shift tends to 0, if so, judging that the gas monitoring sensor has a fault or a working surface does not operate, and if not, entering the step S6;
s6, judging Wj,kWhether or not to tend to 0 or Wj,mWhether or not to go to 0 or Sj,k,mWhether or not to tend to
Or Tj,k,mWhether the gas tends to 1 or not, if so, the gas monitoring sensor is in failure or the working surface is not operated, otherwise, the operation goes to step S7;
s7, judging Wj,kWhether or not it is greater than a set threshold lambdakOr Wj,mWhether or not it is greater than a set threshold lambdamOr Sj,k,mWhether it is large or notAt set threshold η or Tj,k,mIf the gas emission is larger than the set threshold value mu, the gas emission is abnormal if the gas emission is larger than the set threshold value mu, and the gas emission is normal if the gas emission is not larger than the set threshold value mu.
Further, in step S1, the average gas emission concentration per minute of the jth shift is determined according to the following steps:
s11, collecting the gas emission concentration of the jth shift to obtain a gas emission concentration sequence: x1,X2,…,Xi,…,XN(ii) a Wherein, XiThe gas emission concentration in the time period from the ith minute to the ith minute is shown, i is a minute number, and the value of i is 1,2, … and N; j is the number of the shift; n is the total minutes of the shift;
s12, calculating the average value of the gas emission concentration per minute of the jth shift
Further, in step S1, the maximum gas desorption change Q at k minutes in the jth shift is determined according to the following stepsj,k：
S101, determining a k-minute moving average value of the gas emission concentration of the jth shift to obtain a k-minute moving average value sequence of the gas emission concentration: x1,k,ave,X2,k,ave,…,Xi,k,ave,…,XN,k,ave(ii) a Wherein, Xi,k,aveThe gas emission concentration X of the jth shiftiK minutes moving average of (a);
s102, determining the maximum value X in the k-minute moving average sequence of the gas emission concentration of the jth shiftj,k,ave,max；
S103, calculating the maximum gas desorption variable quantity Q in k minutes in the jth shiftj,kSaid Q isj,k＝k·(Xj,k,ave,max-Xj,ave)。
Further, in step S2, the maximum gas desorption change Q in m minutes in the jth shift is determined according to the following stepsj,m：
S201, determining the m-minute moving average value of the gas emission concentration of the jth shift to obtain an m-minute moving average value sequence of the gas emission concentration: x1,m,ave,X2,m,ave,…,Xi,m,ave,…,XN,m,ave(ii) a Wherein, Xi,m,aveThe gas emission concentration X of the jth shiftiM minute moving average of (d);
s202, determining the maximum value X in the m-minute moving average sequence of the gas emission concentration of the jth shiftj,m,ave,max；
S203, calculating the maximum gas desorption variable quantity Q in m minutes in the jth shiftj,mSaid Q isj,m＝m·(Xj,m,ave,max-Xj,ave)。
Further, in step S101, the method
Wherein k is a positive integer and takes a value of 5-180.
Further, in step S201, the method
Wherein m is a positive integer, m is greater than k, and the value of m is 30-480.
Further, step S7 includes: determining W of multiple adjacent shiftsj,kWhether or not there is an increasing tendency or Wj,mWhether there is an increasing trend or Sj,k,mWhether there is an increasing trend or Tj,k,mAnd if the gas has an increasing trend, the gas is abnormally discharged, and if the gas does not have an increasing trend, the gas is normally discharged.
The invention has the beneficial effects that: the method for judging and identifying the gas abnormity by using the gas desorption quantity characteristics obtains a plurality of gas desorption characteristic quantities by calculating two groups of maximum gas desorption variable quantities, judges whether the gas emission is abnormal according to the sizes of the plurality of gas desorption characteristic quantities, achieves the aim of accurately judging and identifying the gas emission abnormity, has good judgment and identification effects, wide application range and low investment cost, and lays a foundation for realizing advanced early warning.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic diagram illustrating the principle of identifying abnormal gas emission by using gas desorption characteristics according to the present invention;
Detailed Description
The invention is further described with reference to the accompanying drawings, in which:
the method for judging and identifying gas abnormality by using the gas desorption quantity characteristics comprises the following steps:
s1, determining the maximum gas desorption variable quantity Q in k minutes in the jth shiftj,kRatio W to the total gas emission of shift jj,k(ii) a Wherein, the
N·Xj,aveIs the total gas emission amount of the jth shift, N is the total minutes of the shift, Xj,aveThe average value of the gas emission concentration per minute of the jth shift is j, and j is the shift number;
s2, determining the maximum gas desorption variable quantity Q in m minutes in the jth shiftj,mRatio W to the total gas emission of shift jj,m(ii) a Wherein, the
S3, determining the maximum gas desorption variable quantity Q in k minutes in the jth shiftj,kMaximum gas desorption variation Q within m minutes of the jth shiftj,mRatio S betweenj,k,m(ii) a Wherein, the
S4, determining the maximum value X in the k-minute moving average value sequence in the jth shiftj,k,ave,maxAnd the maximum value X in the m-minute moving average sequence in the jth shiftj,m,ave,maxRatio of T betweenj,k,m(ii) a Wherein, the
S5, judging whether the total gas emission amount of the jth shift tends to 0, if so, judging that the gas monitoring sensor has a fault or a working surface does not operate, and if not, entering the step S6;
s6, if Wj,kTend to be0、Wj,mTend to 0, Sj,k,mTend to be
Tj,k,mIf at least one of the four items of tendency 1 is true, the gas monitoring sensor is in failure or the working surface is not operated, otherwise, the step S7 is executed;
s7, if Wj,kIs greater than a set threshold lambdak、Wj,mIs greater than a set threshold lambdam、Sj,k,mGreater than set threshold η, Tj,k,mIf at least one of the four items is greater than the set threshold value mu, the gas is abnormal to flow out, otherwise, the gas is normal to flow out. In this embodiment, the threshold λk、λmη and mu differ in their values in different modes of operation in the mine, generally the threshold lambdak、λmGreater than 0, threshold η greater than
The threshold μ is greater than 1;
in this embodiment, in step S1, the average gas emission concentration per minute of the jth shift is determined according to the following steps:
s11, collecting the gas emission concentration of the jth shift to obtain a gas emission concentration sequence: x1,X2,…,Xi,…,XN(ii) a Wherein, XiThe gas emission concentration in the time period from the ith minute to the ith minute is shown, i is a minute number, and the value of i is 1,2, … and N; n is the total minutes of the shift; in this embodiment, according to the actual working condition of the downhole operation, one shift represents one working period, and one working period is generally 360 to 480 minutes, where the period of the jth shift is set to 480 minutes, that is, N is 480.
S12, calculating the average value of the gas emission concentration per minute of the jth shift
In this embodiment, in step S1, the maximum desorption of gas at k minutes in the jth shift is determined according to the following stepsVariation Qj,k：
S101, calculating the gas emission concentration of the jth shift to obtain a gas emission concentration sequence: x1,X2,…,Xi,…,XNObtaining k-minute moving average values of N gas emission concentrations by using the k-minute moving average value of each gas emission concentration; sequencing the k-minute moving average values of the N gas emission concentrations according to the sequence of the original gas emission concentration sequence to obtain a k-minute moving average value sequence of the gas emission concentrations: x1,k,ave,X2,k,ave,…,Xi,k,ave,…,XN,k,ave(ii) a Wherein, Xi,k,aveThe gas emission concentration X of the jth shiftiK minutes moving average of (a);
s102, arranging the k-minute moving average sequence of the gas emission concentration according to the sequence of the sizes, and taking the first value after arrangement as the maximum value X in the k-minute moving average sequence of the gas emission concentration of the jth shiftj,k,ave,max；
S103, calculating the maximum gas desorption variable quantity Q in k minutes in the jth shiftj,kSaid Q isj,k＝k·(Xj,k,ave,max-Xj,ave)。
In this embodiment, in step S2, the maximum gas desorption change Q in m minutes in the jth shift is determined according to the following stepsj,m：
S201, calculating the gas emission concentration of the jth shift to obtain a gas emission concentration sequence: x1,X2,…,Xi,…,XNObtaining the m-minute moving average of N gas emission concentrations by the m-minute moving average of each gas emission concentration; sequencing the m-minute moving average values of the N gas emission concentrations according to the sequence of the original gas emission concentration sequence to obtain an m-minute moving average value sequence of the gas emission concentrations: x1,m,ave,X2,m,ave,…,Xi,m,ave,…,XN,m,ave(ii) a Wherein, Xi,m,aveThe gas emission concentration X of the jth shiftiM minute moving average of (d);
s202, arranging the m-minute moving average value sequence of the gas emission concentration according to the sequence of the magnitude, and taking the first value after arrangement as the m-minute moving average of the gas emission concentration of the jth shiftMaximum value X in the mean sequencej,m,ave,max；
S203, calculating the maximum gas desorption variable quantity Q in m minutes in the jth shiftj,mSaid Q isj,m＝m·(Xj,m,ave,max-Xj,ave)。
In this embodiment, in step S101, the gas emission concentration X of the jth shiftiK minute moving average of
Wherein k is a positive integer and takes a value of 5-180.
In this embodiment, in step S201, the gas emission concentration X of the jth shiftiM minute moving average of
Wherein m is a positive integer, m is greater than k, and the value of m is 30-480.
In this embodiment, step S7 further includes: if W of multiple adjacent shiftsj,kW tends to increasej,mHas an increasing tendency, Sj,k,mHas an increasing tendency, Tj,k,mIf at least one of the four items with the increasing trend is true, the gas emission quantity is gradually increased, the gas emission is abnormal, otherwise, the gas emission is normal; in this embodiment, the number of adjacent shifts participating in the judgment is adjusted according to the actually obtained gas monitoring data.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A method for judging and identifying gas abnormality by using gas desorption quantity characteristics is characterized by comprising the following steps: the method comprises the following steps:
s1, determining the maximum gas desorption change at k minutes in the jth shiftChemical quantity Qj,kRatio W to the total gas emission of shift jj,k(ii) a Wherein, the
N·Xj,aveIs the total gas emission amount of the jth shift, N is the total minutes of the shift, Xj,aveThe average value of the gas emission concentration per minute of the jth shift is j, and j is the shift number;
s2, determining the maximum gas desorption variable quantity Q in m minutes in the jth shiftj,mRatio W to the total gas emission of shift jj,m(ii) a Wherein, the
S3, determining the maximum gas desorption variable quantity Q in k minutes in the jth shiftj,kMaximum gas desorption variation Q within m minutes of the jth shiftj,mRatio S betweenj,k,m(ii) a Wherein, the
S4, determining the maximum value X in the k-minute moving average value sequence in the jth shiftj,k,ave,maxAnd the maximum value X in the m-minute moving average sequence in the jth shiftj,m,ave,maxRatio of T betweenj,k,m(ii) a Wherein, the
S5, judging whether the total gas emission amount of the jth shift tends to 0, if so, judging that the gas monitoring sensor has a fault or a working surface does not operate, and if not, entering the step S6;
s6, judging Wj,kWhether or not to tend to 0 or Wj,mWhether or not to go to 0 or Sj,k,mWhether or not to tend to
Or Tj,k,mWhether the gas tends to 1 or not, if so, the gas monitoring sensor fails orIf the working surface is not operated, the process goes to step S7;
s7, judging Wj,kWhether or not it is greater than a set threshold lambdakOr Wj,mWhether or not it is greater than a set threshold lambdamOr Sj,k,mWhether greater than a set threshold η or Tj,k,mIf the gas emission is larger than the set threshold value mu, the gas emission is abnormal if the gas emission is larger than the set threshold value mu, and the gas emission is normal if the gas emission is not larger than the set threshold value mu.
2. The method for identifying gas abnormality by using a gas desorption amount characteristic according to claim 1, characterized in that: in step S1, the average gas emission concentration per minute for the jth shift is determined according to the following steps:
s11, collecting the gas emission concentration of the jth shift to obtain a gas emission concentration sequence: x1,X2,…,Xi,…,XN(ii) a Wherein, XiThe gas emission concentration in the time period from the ith minute to the ith minute is shown, i is a minute number, and the value of i is 1,2, … and N; j is the number of the shift; n is the total minutes of the shift;
s12, calculating the average value of the gas emission concentration per minute of the jth shift
3. The method for identifying gas abnormality by using a gas desorption amount characteristic according to claim 1, characterized in that: in step S1, the maximum gas desorption change Q at k minutes in the jth shift is determined according to the following stepsj,k：
S101, determining a k-minute moving average value of the gas emission concentration of the jth shift to obtain a k-minute moving average value sequence of the gas emission concentration: x1,k,ave,X2,k,ave,…,Xi,k,ave,…,XN,k,ave(ii) a Wherein, Xi,k,aveThe gas emission concentration X of the jth shiftiK minutes moving average of (a);
s102, determining the maximum value X in the k-minute moving average sequence of the gas emission concentration of the jth shiftj,k,ave,max；
S103, calculatingMaximum gas desorption variation Q in k minutes within j shiftsj,kSaid Q isj,k＝k·(Xj,k,ave,max-Xj,ave)。
4. The method for identifying gas abnormality by using a gas desorption amount characteristic according to claim 1, characterized in that: in step S2, the maximum gas desorption change Q in m minutes in the jth shift is determined according to the following stepsj,m：
S201, determining the m-minute moving average value of the gas emission concentration of the jth shift to obtain an m-minute moving average value sequence of the gas emission concentration: x1,m,ave,X2,m,ave,…,Xi,m,ave,…,XN,m,ave(ii) a Wherein, Xi,m,aveThe gas emission concentration X of the jth shiftiM minute moving average of (d);
s202, determining the maximum value X in the m-minute moving average sequence of the gas emission concentration of the jth shiftj,m,ave,max；
S203, calculating the maximum gas desorption variable quantity Q in m minutes in the jth shiftj,mSaid Q isj,m＝m·(Xj,m,ave,max-Xj,ave)。
5. The method for identifying gas abnormality by using a gas desorption amount characteristic according to claim 1, characterized in that: in step S101, the
Wherein k is a positive integer and takes a value of 5-180.
6. The method for identifying gas abnormality by using a gas desorption amount characteristic according to claim 1, characterized in that: in step S201, the
Wherein m is a positive integer, m is greater than k, and the value of m is 30-480.
7. Desorption with gas according to claim 1The method for judging and identifying gas abnormality by quantity characteristics is characterized by comprising the following steps: in step S7, the method further includes: determining W of multiple adjacent shiftsj,kWhether or not there is an increasing tendency or Wj,mWhether there is an increasing trend or Sj,k,mWhether there is an increasing trend or Tj,k,mAnd if the gas has an increasing trend, the gas is abnormally discharged, and if the gas does not have an increasing trend, the gas is normally discharged.
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| CN112282733A (en) * | 2020-10-29 | 2021-01-29 | 中煤科工集团重庆研究院有限公司 | Method for determining coal bed gas abnormity by gas emission quantity characteristic while drilling |
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