CN111612258B - 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 abnormity 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 amount j,k (ii) a S2, determining the ratio W of the maximum gas desorption variable quantity in m minutes to the total gas emission quantity j,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 minutes j,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 sequence j,k,m (ii) a S5, if the total gas emission amount does not tend to 0, carrying out the next step; s6. If W j,k Not tend to be 0 or W j,m Not tending to 0 or S j,k,m Is not prone to
Or T j,k,m If the trend does not reach 1, the next step is carried out; s7, if W j,k 、W j,m 、S j,k,m 、T j,k,m If at least one of the two is larger, the gas will flow out abnormally. Book (I)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 invention relates to a method for judging and identifying gas abnormity by using gas desorption quantity characteristics, which comprises the following steps of:
s1, determining the maximum gas desorption variation Q at k minutes in the jth shift j,k Ratio W to the total gas emission of shift j j,k (ii) a Wherein, the
N·X j,ave Is the total gas emission amount of the jth shift, N is the total minutes of the shift, X j,ave The gas emission concentration average value of the jth shift per minute, wherein j is the shift number;
s2, determining the maximum gas desorption variation Q in m minutes in the jth shift j,m Ratio W to the total gas emission of shift j j,m (ii) a Wherein, the
S3, determining the maximum gas desorption variable quantity Q in k minutes in the jth shift j,k Maximum gas desorption variation Q within m minutes of the jth shift j,m Ratio S between j,k,m (ii) a Wherein, the
S4, determining the maximum value X in the k-minute moving average value sequence in the jth shift j,k,ave,max With the maximum value X in the sequence of m-minute moving means within the jth shift j,m,ave,max Ratio of T between j,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 W j,k Whether or not to tend to 0 or W j,m Whether or not to go to 0 or S j,k,m Whether or not to tend to
Or T j,k,m Whether the gas tends to 1 or not, if so, the gas monitoring sensor is in failure or the working surface is not operated, and if not, the step S7 is executed;
s7, judging W j,k Whether or not it is greater than a set threshold lambda k Or W j,m Whether or not it is greater than a set threshold lambda m Or S j,k,m Whether greater than a set threshold η or T j,k,m If 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: x 1 ,X 2 ,…,X i ,…,X N (ii) a Wherein X i The gas emission concentration in the time period from the ith minute to the ith minute, i is a minute number, and the value of i is 1,2, \ 8230;, N; j is the number of the shift; n is the total number of 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 amount Q at k minute in the jth shift is determined according to the following steps j,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: x 1,k,ave ,X 2,k,ave ,…,X i,k,ave ,…,X N,k,ave (ii) a Wherein, X i,k,ave The gas emission concentration X of the jth shift i K 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 shift j,k,ave,max ；
S103, calculating the maximum gas desorption variable quantity Q in k minutes in the jth shift j,k Said Q is j,k ＝k·(X j,k,ave,max -X j,ave )。
Further, in step S2, the maximum gas desorption change Q in m minutes in the jth shift is determined according to the following steps j,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: x 1,m,ave ,X 2,m,ave ,…,X i,m,ave ,…,X N,m,ave (ii) a Wherein X i,m,ave The gas emission concentration X of the jth shift i M 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 shift j,m,ave,max ；
S203, calculating the maximum gas desorption variation Q in m minutes in the jth shift j,m Said Q is j,m ＝m·(X j,m,ave,max -X j,ave )。
Further, in step S101, the method comprises
Wherein k is a positive integer and takes a value of 5 to 180.
Further, in step S201, the method
Wherein m is a positive integer, m is greater than k, and m is 30-480.
Further, step S7 further includes: determining W of multiple adjacent shifts j,k Whether or not there is an increasing tendency or W j,m Whether there is an increasing tendency or S j,k,m Whether there is an increasing trend or T j,k,m And if the gas has an increasing trend, the gas is abnormal to flow out, and if the gas does not have an increasing trend, the gas is normal to flow out.
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, and judges whether the gas emission is abnormal or not according to the sizes of the plurality of gas desorption characteristic quantities, so that the aim of accurately judging and identifying the gas emission abnormity is fulfilled, the judgment and identification effect is good, the application range is wide, the investment cost is low, and a foundation is laid 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 the 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 variation Q at k minutes in the jth shift j,k Ratio W to the total gas emission of shift j j,k (ii) a Wherein, the
N·X j,ave The total gas emission amount of the jth shift, N is the total minutes of the shift, X j,ave The 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 shift j,m Ratio W to the total gas emission of shift j j,m (ii) a Wherein, the
S3, determining the maximum gas desorption variable quantity Q in k minutes in the jth shift j,k Maximum gas desorption variation Q within m minutes of the jth shift j,m Ratio S between j,k,m (ii) a Wherein, the
S4, determining the maximum value X in the k-minute moving average value sequence in the jth shift j,k,ave,max And the maximum value X in the m-minute moving average sequence in the jth shift j,m,ave,max Ratio of T between j,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 W j,k Tends to be 0, W j,m Tend to 0, S j,k,m Tend to be
T j,k,m If at least one of the four items of 1 tendency is true, the gas monitoring sensor is in failure or the working surface is not operated, otherwise, the step S7 is carried out;
s7, if W j,k Is greater than a set threshold lambda k 、W j,m Is greater thanSetting a threshold lambda m 、S j,k,m Greater than a set threshold value eta, T j,k,m If 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 λ k 、λ m Eta and mu have different values in different mine operation modes, generally, the threshold value lambda k 、λ m Greater than 0, the threshold η is 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: x 1 ,X 2 ,…,X i ,…,X N (ii) a Wherein, X i The 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, \8230, N; n is the total number of 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 gas desorption variation Q at k minutes in the jth shift is determined according to the following steps j,k ：
S101, calculating the gas emission concentration of the jth shift to obtain a gas emission concentration sequence: x 1 ,X 2 ,…,X i ,…,X N Obtaining 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 means of the N gas emission concentrations according to the sequence of the original gas emission concentration sequence to obtain the k-minute moving means of the gas emission concentrationsThe sequence is as follows: x 1,k,ave ,X 2,k,ave ,…,X i,k,ave ,…,X N,k,ave (ii) a Wherein, X i,k,ave The gas emission concentration X of the jth shift i K 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 shift j,k,ave,max ；
S103, calculating the maximum gas desorption variable quantity Q in k minutes in the jth shift j,k Said Q is j,k ＝k·(X j,k,ave,max -X j,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 steps j,m ：
S201, calculating the gas emission concentration of the jth shift to obtain a gas emission concentration sequence: x 1 ,X 2 ,…,X i ,…,X N Obtaining 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: x 1,m,ave ,X 2,m,ave ,…,X i,m,ave ,…,X N,m,ave (ii) a Wherein X i,m,ave The gas emission concentration X of the jth shift i M 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 current value, and taking the first value after arrangement as the maximum value X in the m-minute moving average value sequence of the gas emission concentration of the jth shift j,m,ave,max ；
S203, calculating the maximum gas desorption variable quantity Q in m minutes in the jth shift j,m Said Q is j,m ＝m·(X j,m,ave,max -X j,ave )。
In this embodiment, in step S101, the gas emission concentration X of the jth shift i K minute moving average of
Wherein k is a positive integer and takes a value of 5 to 180.
In this embodiment, in step S201, the gas emission concentration X of the jth shift i M minute moving average of
Wherein m is a positive integer, m is greater than k, and m is 30-480.
In this embodiment, step S7 further includes: if W of multiple adjacent shifts j,k Tends to increase, W j,m Has an increasing tendency, S j,k,m Has an increasing tendency, T j,k,m If 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 variable quantity Q in k minutes in the jth shift j,k The ratio W of the total gas emission quantity of the jth shift j,k (ii) a Wherein, the
N·X j,ave Is the total gas emission amount of the jth shift, N is the total minutes of the shift, X j,ave The gas emission concentration average value of the jth shift per minute, wherein j is the shift number;
s2, determining the maximum gas desorption variation Q in m minutes in the jth shift j,m The ratio W of the total gas emission quantity of the jth shift j,m (ii) a Wherein, the
S3, determining the maximum gas desorption variable quantity Q in k minutes in the jth shift j,k Maximum gas desorption variation Q within m minutes of the jth shift j,m Ratio S between j,k,m (ii) a Wherein, the
S4, determining the maximum value X in the k-minute moving average value sequence in the jth class j,k,ave,max And the maximum value X in the m-minute moving average sequence in the jth shift j,m,ave,max Ratio of T between j,k,m (ii) a Wherein, the first and the second end of the pipe are connected with each other,
the above-mentioned
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 W j,k Whether or not to tend to 0 or W j,m Whether or not to go to 0 or S j,k,m Whether or not it tends to
Or T j,k,m Whether the gas tends to 1 or not, if so, the gas monitoring sensor is in failure or the working surface is not operated, and if not, the step S7 is executed;
s7, judging W j,k Whether or not it is greater than a set threshold lambda k Or W j,m Whether or not it is greater than a set threshold lambda m Or S j,k,m Whether it is greater than a predetermined threshold eta or T j,k,m If 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 abnormality of gas using a characteristic of a desorption amount of gas as set forth in claim 1, wherein: in step S1, determining the average gas emission concentration per minute of the jth shift according to the following steps:
s11, collecting the gas emission concentration of the jth shift to obtain a gas emission concentration sequence: x 1 ,X 2 ,…,X i ,…,X N (ii) a Wherein, X i The gas emission concentration in the time period from the ith minute to the ith minute, i is a minute number, and the value of i is 1,2, \ 8230;, 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 abnormality of gas using a characteristic of a desorption amount of gas as set forth in claim 1, wherein: in step S1, the maximum gas desorption change Q in k minutes in the jth shift is determined according to the following steps j,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: x 1,k,ave ,X 2,k,ave ,…,X i,k,ave ,…,X N,k,ave (ii) a Wherein, X i,k,ave The gas emission concentration X of the jth shift i K 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 shift j,k,ave,max ；
S103, calculating the maximum gas desorption variable quantity Q in k minutes in the jth shift j,k ，
Said Q j,k ＝k·(X j,k,ave,max -X j,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 following steps are followedMaximum gas desorption variation Q within m minutes in the jth shift j,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: x 1,m,ave ,X 2,m,ave ,…,X i,m,ave ,…,X N,m,ave (ii) a Wherein X i,m,ave The gas emission concentration X of the jth shift i M 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 shift j,m,ave,max ；
S203, calculating the maximum gas desorption variable quantity Q in m minutes in the jth shift j,m ，
Said Q j,m ＝m·(X j,m,ave,max -X j,ave )。
5. The method for identifying gas abnormality by using a gas desorption amount characteristic according to claim 3, wherein: in step S101, the
Wherein k is a positive integer, and the value of k is 5 to 180.
6. The method for identifying gas abnormality by using gas desorption quantity characteristics according to claim 4, wherein: in step S201, the
Wherein m is a positive integer, m is greater than k, and m is 30-480.
7. The method for identifying abnormality of gas using a characteristic of a desorption amount of gas as set forth in claim 1, wherein: in step S7, the method further includes: w for judging multiple adjacent shifts j,k Whether or not there is an increasing tendency or W j,m Whether there is an increasing trend or S j,k,m Whether there is an increasing trend or T j,k,m If the gas has an increasing trend, if so, the gas is abnormal to flow out, and if not, the gas is abnormal to flow outAnd (4) normal.
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