CN101598033A - The method that a kind of on-the-spot forecasting coal and gas are outstanding - Google Patents

Abstract

The present invention relates to the outstanding method of a kind of forecasting coal and gas, it is characterized in that, may further comprise the steps: the first step, adopt the drilling cuttings desorption of mash gas index method assay method mensuration of AQ/T1065-2008 regulation to produce coal and the preliminary index K of gas outbursts Prediction ₁Value; Second step, introduce new prediction judge index i value, its design formulas is as follows: Q=K ₃T ⁱ-W _LIn the formula: the desorption of mash gas total amount of Q-time T, cm ³/ gT-the time, minW _LThe loss gas amount of coal sample before the-test, cm ³/ gK ₃-constant the 3rd step, measure the i value, can be as follows 1) get coal sample and place in the coal sample jar; 2) by converting the formed pressure of desorption of mash gas amount of coal sample to the signal of telecommunication with the tank connected pressure sensor of coal sample, deliver to amplifying circuit and carry out signal and amplify, deliver to single-chip microcomputer then and carry out data with least square method and handle; Draw the 4th step of i value, in conjunction with i value and K ₁Value is judged gas is outstanding.

Description

The method that a kind of on-the-spot forecasting coal and gas are outstanding

Technical field

The present invention relates to the outstanding method of a kind of forecasting coal and gas, the particularly a kind of on-the-spot forecasting coal and outstanding method of gas that can improve prediction accuracy.

Background technology

The judgement parameter of selecting for use before coal and the gas outbursts Prediction has drilling cuttings desorption of mash gas index method, coal powder quantity of bore (S) method, the boring gas initial velocity method (q) of gushing out, R value method etc.Above-mentioned the whole bag of tricks all is the legal determination methods and the index of China.These methods all are based upon on the desorption of mash gas principle except that the coal powder quantity of bore method.

With drilling cuttings desorption of mash gas method is example, Δ h ₂The difference that is the gas formed and the atmospheric pressure in volume variable container that adopt the every gram coal in the coal sample 2min of test back is as criterion.And another index K ₁Value is to adopt the desorption of mash gas amount of the every gram coal of gas in the min that the desorb square root equation of desorb value (every 0.5min measures once) by coal in the 5min calculate to judge that its design formulas is as follows:

$Q=K_1\sqrt{T}-W_L$

In the formula:

Desorption of mash gas total amount when the Q------time is T, cm ³/ g;

The T----time, min;

W _L--the loss gas amount of coal sample before the-test, cm ³/ g;

K ₁---constant when T=1, is the desorption quantity in the coal sample exposure back 1min, cm ³/ g.From Δ h2 and K ₁Definition, they all with seam gas content have close related, but we have scrutinized after the desorb feature of coal, are not difficult to find out that above-mentioned two indexs also will be subjected to the influence of the desorption rate of coal simultaneously.The coal of same gas bearing capacity, desorption rate height can impel above-mentioned two kinds of judge index to increase.Thereby the outstanding abnormal phenomena of the not outstanding low index in high target coal seam can appear in using deterministic process, influence determine effect.

Therefore, address the above problem, must do further research.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of on-the-spot forecasting coal and the outstanding method of gas, solves the not enough problem of the degree of accuracy in the existing Forecasting Methodology.

In order to solve the problems of the technologies described above, the invention provides the outstanding method of a kind of on-the-spot forecasting coal and gas, may further comprise the steps:

The first step adopts the drilling cuttings desorption of mash gas index method assay method mensuration of AQ/T1065-2008 regulation to produce coal and the preliminary index K of gas outbursts Prediction ₁Value;

Second step, introduce prediction judge index i value,

Its design formulas is as follows:

Q＝K ₃T ⁱ-W _L

In the formula:

The desorption of mash gas total amount of Q------time T, cm ³/ g

The T----time, min

W _L--the loss gas amount of coal section coal before the-test, cm ³/ g

K ₃---constant

The 3rd step, measure the i value, can be as follows,

1) getting coal sample places in the coal sample jar;

2) by with the tank connected pressure sensor of coal sample with coal sample the formed pressure of desorption of mash gas amount convert the signal of telecommunication to, deliver to amplifying circuit and carry out signal and amplify, deliver to single-chip microcomputer then and carry out data with least square method and handle; Concrete mensuration process is as follows

A) time interval T adopts 0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,4.5,5.0, and its corresponding desorption quantity is Q _{Z, J, I, N}, N is 1,2,3,4,5,6,7,8,9 for measuring sequence number, 10., adopts the power formula to calculate

$Q_{Z,J,I,N}=K_3{T}_N^i$

Each measuring point has 10 data (i.e. the sampled data of a measuring point) just can calculate 10 Q _{Z, J, I, N}, be respectively Q _{Z, J, I, 1}, Q _{Z, J, I, 2}, Q _{Z, J, I, 3}, Q _{Z, J, I, 4}, Q _{Z, J, I, 5}, Q _{Z, J, I, 6}, Q _{Z, J, I, 7}, Q _{Z, J, I, 8}, Q _{Z, J, I, 9}, Q _{Z, J, I, 10}(being that N is by 1-10), its corresponding time is T ₁=0.5, T ₂=1, T ₃=1.5, T ₄=2, T ₅=2.5, T ₆=3, T ₇=3.5, T ₈=4, T ₉=4.5, T ₁₀=5

Will $Q_{Z,J,I,N}=K_3{T}_{Z,J,I,N}^i$ Becoming straight line equation, takes the logarithm in formula equal sign two ends, and formula is rewritten as

lnQ _{Z，J，I，N}＝lnK ₃+ilnT _N

Bringing the determination data in the remarks into following formula just has 10 formula, promptly

lnQ _{Z，J，I，1}＝lnK ₃+ilnT ₁

lnQ _{Z，J，I，2}＝lnK ₃+ilnT ₂

lnQ _{Z，J，I，3}＝lnK ₃+ilnT ₃

lnQ _{Z，J，I，4}＝lnK ₃+ilnT ₄

lnQ _{Z，J，I，5}＝lnK ₃+ilnT ₅

lnQ _{Z，J，I，6}＝lnK ₃+ilnT ₆

lnQ _{Z，J，I，7}＝lnK ₃+ilnT ₇

lnQ _{Z，J，I，8}＝lnK ₃+ilnT ₈

lnQ _{Z，J，I，9}＝lnK ₃+ilnT ₉

lnQ _{Z，J，I，10}＝lnK ₃+ilnT ₁₀

Unknown number is K in above-mentioned 10 formula ₃K, I,, available least square method solves. and least square method is used formula

$\stackrel{\‾}{\ln Q_{Z,J,I}}=\frac{\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\ln Q_{Z,J,I,N}}{N}$

${\left({\ln Q}_{Z,J,I}\right)}^2=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}{\left({\ln Q}_{Z,J,I,N}\right)}^2$

$\stackrel{\‾}{\ln T}=\frac{\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\ln T_N}{N}$

${\left(\ln T\right)}^2=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\left(\ln T_N\right)$

${\ln Q}_{Z,J,I}\ln T=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\left({\ln T}_N\right)\×{\ln Q}_{Z,J,I,N}$

S _X＝(lnT) ²-N(lnT) ²

S _Y＝(lnQ _Z，J，I) ²-NlnQ _Z，J，I ²

S _XY＝(lnQ _Z，J，IlnT)-N(lnQ _Z，J，I×lnT)

$I=\frac{S_{\mathrm{XY}}}{S_X}$

lnK ₃＝lnQ _Z，J，I-I×lnT

LnK ₃Draw K behind the negate ln ₃Value.

Deposit the data i that records in memory cell

The 4th step is in conjunction with i value and K ₁Value is judged gas is outstanding.

Adopt such scheme,, overcome in the existing Forecasting Methodology prediction index K owing to introduced new prediction index i ₁Only have close relatedly and do not consider the defective of influence of the desorption of mash gas speed of coal to improve precision of prediction, avoid error in judgement with seam gas content.When the i value less than 0.5 the time, the outburst danger in coal seam heightens, when greater than 0.5 the time, outburst hazard can significantly reduce.

Description of drawings

The present invention is further illustrated below in conjunction with the specific embodiment.

Fig. 1 is the circuit block diagram that the present invention measures i value usefulness;

The specific embodiment

The first step adopts the drilling cuttings desorption of mash gas index method assay method mensuration of AQ/T1065-2008 regulation to produce coal and the preliminary index K of gas outbursts Prediction ₁Value;

Second step, introduce new prediction judge index i value,

Its design formulas is as follows:

Q＝K ₃T ⁱ-W _L

In the formula:

Desorption of mash gas total amount when the Q------time is T, cm ³/ g;

The T----time, min

W _L--the loss gas amount of coal sample before the-test, cm ³/ g;

K ₃---constant

The 3rd step, measure the i value, can be as follows

1) getting coal sample places in the coal sample jar;

2) by the desorption rate conversion time spent of coal sample being taken out coal sample from the coal seam with the tank connected pressure sensor of coal sample, behind coal sample sieve series sample, put into the coal sample jar, sensor becomes the signal of telecommunication with the rate conversion of coal sample jar, deliver to amplifying circuit and carry out the signal amplification, deliver to single-chip microcomputer then and carry out the data processing; Concrete mensuration process is as follows

A) time interval T adopts 0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,4.5,5.0, and its corresponding desorption quantity is Q _{Z, J, I, N}, N is 1,2,3,4,5,6,7,8,9 for measuring sequence number, 10., adopts the power formula to calculate

$Q_{Z,J,I,N}=K{T}_N^i$

Each measuring point has 10 data (i.e. the sampled data of a measuring point) just can calculate 10 Q _{Z, J, I, N}, be respectively Q _{Z, J, I, 1}, Q _{Z, J, I, 2}, Q _{Z, J, I, 3}, Q _{Z, J, I, 4}, Q _{Z, J, I, 5}, Q _{Z, J, I, 6}, Q _{Z, J, I, 7}, Q _{Z, J, I, 8}, Q _{Z, J, I, 9}, Q _{Z, J, I, 10}(being that N is by 1-10), its corresponding time is T ₁=0.5, T ₂=1, T ₃=1.5, T ₄=2, T ₅=2.5, T ₆=3, T ₇=3.5, T ₈=4, T ₉=4.5, T ₁₀=5

Will $Q_{Z,J,I,N}=K{T}_{Z,J,I,N}^i$ Becoming straight line equation, takes the logarithm in formula equal sign two ends, and formula is rewritten as

lnQ _{Z，J，I，N}＝lnK+ilnT _N

Bringing the determination data in the remarks into following formula just has 10 formula, promptly

lnQ _{Z，J，I，1}＝lnK+ilnT ₁

lnQ _{Z，J，I，2}＝lnK+ilnT ₂

lnQ _{Z，J，I，3}＝lnK+ilnT ₃

lnQ _{Z，J，I，4}＝lnK+ilnT ₄

lnQ _{Z，J，I，5}＝lnK+ilnT ₅

lnQ _{Z，J，I，6}＝lnK+ilnT ₆

lnQ _{Z，J，I，7}＝lnK+ilnT ₇

lnQ _{Z，J，I，8}＝lnK+ilnT ₈

lnQ _{Z，J，I，9}＝lnK+ilnT ₉

lnQ _{Z，J，I，10}＝lnK+ilnT ₁₀

Unknown number is K, I in above-mentioned 10 formula,, available least square method solves. and least square method is used formula

$\stackrel{\‾}{\ln Q_{Z,J,I}}=\frac{\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\ln Q_{Z,J,I,N}}{N}$

${\left({\ln Q}_{Z,J,I}\right)}^2=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}{\left({\ln Q}_{Z,J,I,N}\right)}^2$

$\stackrel{\‾}{\ln T}=\frac{\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\ln T_N}{N}$

${\left(\ln T\right)}^2=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\left(\ln T_N\right)$

${\ln Q}_{Z,J,I}\ln T=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\left({\ln T}_N\right)\×{\ln Q}_{Z,J,I,N}$

S _X＝(lnT) ²-N(lnT) ²

S _Y＝(lnQ _Z，J，I) ²-NlnQ _Z，J，I ²

S _XY＝(lnQ _Z，J，IlnT)-N(lnQ _Z，J，I×lnT)

$I=\frac{S_{\mathrm{XY}}}{S_X}$

lnK＝lnQ _Z，J，I-I×lnT

Draw the k value behind the lnk negate ln.

With the data i that records, deposit memory cell in

The 3rd step is in conjunction with i value and K ₁Value is judged gas is outstanding.

Fig. 1 is an equipment circuit schematic diagram of measuring the i value, and as shown in Figure 1, what Fig. 2 provided is circuit block diagram of the present utility model.In this figure, sensor 2 is the pressure sensors that the rate conversion of coal sample desorb gas can be become the signal of telecommunication, sensor 2 is delivered to amplifying circuit 3 with the signal of telecommunication that is obtained and is carried out the signal amplification, and then deliver to single-chip microcomputer 4 and carry out the data processing, be provided with specialty analysis software in the single-chip microcomputer 4, show last gas outbursts Prediction result by the display 10 that is connected with single-chip microcomputer 4.For ease of hand input-data, also be connected with keyboard 5 on the single-chip microcomputer.The function of battery pack 8 is to provide power supply for circuit.

For the demonstration time, also be provided with the clock circuit 6 that is connected with single-chip microcomputer 4, the resident display screen upper right side of clock, start back, clock is 24 hours systems.Shutdown back clock should normally move.

For stable operating current is provided to circuit, be provided with mu balanced circuit 7.Simultaneously for ease of checking the voltage of battery pack, be provided with battery capacity monitoring circuit 9, battery capacity monitoring circuit 9 connects battery pack 8 and single-chip microcomputer 4 respectively, its effect is to play the battery capacity function for monitoring, detects the capacity of battery after the start at any time, and the prompting sign that shows battery meter in the screen upper left corner, when battery is under-voltage, the flicker of battery capacity prompting sign, showed on screen every 1 minute simultaneously " the battery electric quantity deficiency please in time is charged! " the Chinese character warning prompt, show that time span is 1s or longer.

For ease of remind, the caution user, be provided with buzzer 11 in the circuit, such as this instrument self checking failure or in service when diagnosing out parts that fault is arranged, can carry out acoustic alarm, show fault content and processing method simultaneously.When input is provided with mistake, acoustic alarm be can carry out, wrong content and processing method shown simultaneously.During the instrument startup and shutdown, the prompting sound is arranged.Dissimilar warnings and prompting, its sound is distinguished to some extent, and sound sound level is not less than 40dB.

The communication interface circuit 12 that is connected with single-chip microcomputer 4, its effect are to be convenient to be connected with external application data storage processing equipment such as PC carry out transfer of data, data storage, analyze and report printing etc.

Be described in detail the concrete course of work below.

The coal sample of 1 ~ 3mm is put into quantitative coal sample bottle (filling) put into constant volume container, and, start process of measurement container closure with sensor 2.

Gas in the coal is to reduce and generation desorb gas phenomenon at environment stress, and the gas that desorbs in the coal is full of the coal sample jar of sealing, causes a jar interior gas pressure to be higher than environment stress.Be transformed into the signal of telecommunication by pressure sensor, enter single-chip microcomputer 4, analyze with special-purpose software, and with analysis result output to display or other fixture (through communication interface link to each other with PC, buzzer 11).Sensor 2 every 0.5min take one of pressure value, totally 10, adopt the square root formula to obtain K with least square ₁Value also adopts the power formula simultaneously, obtains the i value with above-mentioned least square.With the K that measures ₁With the i value, the threshold comparison with experience can get the outburst dangerous level of work plane reference.When judgment task face degree of danger legal and experience is variant, for safety, adopt highest level.

Claims (1)

1. the outstanding method of on-the-spot forecasting coal and gas is characterized in that, may further comprise the steps:

The first step adopts the drilling cuttings desorption of mash gas index method assay method mensuration of AQ/T1065-2008 regulation to produce coal and the preliminary index K of gas outbursts Prediction ₁Value;

Second step, introduce prediction judge index i value,

Its design formulas is as follows:

Q＝K ₃T′-W _L

In the formula:

Desorption of mash gas total amount when the Q------time is T, cm ³/ g;

The T----time, min

W _L--the loss gas amount of coal sample before the-test, cm ³/ g;

K ₃---constant

The 3rd step, measure the i value, can be as follows,

1) getting coal sample places in the coal sample jar;

2) by with the tank connected pressure sensor of coal sample with coal sample the formed pressure of desorption of mash gas amount convert the signal of telecommunication to, deliver to amplifying circuit and carry out signal and amplify, deliver to single-chip microcomputer then and carry out data with least square method and handle; Concrete mensuration process is as follows

A) time interval T adopts 0.5,1.0,1.5,2.0,2.5,3.0,3.5,4.0,4.5,5.0, and its corresponding desorption quantity is Q _{Z, J, I, N}, N is 1,2,3,4,5,6,7,8,9 for measuring sequence number, 10., adopts the power formula to calculate

$Q_{Z,J,I,N}=K_3{Y}_N^i$

Each measuring point has 10 data (i.e. the sampled data of a measuring point) just can calculate 10 Q _{Z, J, I, N}, be respectively Q _{Z, J, I, 1}, Q _{Z, J, I, 2}, Q _{Z, J, I, 3}, Q _{Z, J, I, 4}, Q _{Z, J, I, 5}, Q _{Z, J, I, 6}, Q _{Z, J, I, 7}, Q _{Z, J, I, 8}, Q _{Z, J, I, 9}, Q _{Z, J, I, 10}(being that N is by 1-10), its corresponding time is T ₁=0.5, T ₂=1, T ₃=1.5, T ₄=2, T ₅=2.5, T ₆=3, T ₇=3.5, T ₈=4, T ₉=4.5, T ₁₀=5

Will $Q_{Z,J,I,N}=K_3{T}_{Z,J,I,N}^i$ Becoming straight line equation, takes the logarithm in formula equal sign two ends, and formula is rewritten as

lnQ _{Z，J，I，N}＝lnK ₃+ilnT _N

Bringing the determination data in the remarks into following formula just has 10 formula, promptly

lnQ _{Z，J，I，1}＝lnK ₃+ilnT ₁

lnQ _{Z，J，I，2}＝lnK ₃+ilnT ₂

lnQ _{Z，J，I，3}＝lnK ₃+ilnT ₃

lnQ _{Z，J，I，4}＝lnK ₃+ilnT ₄

lnQ _{Z，J，I，5}＝lnK ₃+ilnT ₅

lnQ _{Z，J，I，6}＝lnK ₃+ilnT ₆

lnQ _{Z，J，I，7}＝lnK ₃+ilnT ₇

lnQ _{Z，J，I，8}＝lnK ₃+ilnT ₈

lnQ _{Z，J，I，9}＝lnK ₃+ilnT ₉

lnQ _{Z，J，I，10}＝lnK ₃+ilnT ₁₀

Unknown number is K in above-mentioned 10 formula ₃K, I,, available least square method solves. and least square method is used formula

$\stackrel{\‾}{\ln Q_{Z,J,I}}=\frac{\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\ln Q_{Z,J,I,N}}{N}$

${\left(\ln Q_{Z,J,I}\right)}^2=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}{\left(\ln Q_{Z,J,I,N}\right)}^2$

$\stackrel{\‾}{\ln T}=\frac{\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\ln T_N}{N}$

${\left(\ln T\right)}^2=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\left(\ln T_N\right)$

$\ln Q_{Z,J,I}\ln T=\underset{n=1}{\overset{10}{\mathrm{\Σ}}}\left(\ln T_N\right)\×\ln Q_{Z,J,I,N}$

S _X＝(lnT) ²-N(lnT) ²

S _Y＝(lnQ _Z，J，I) ²-NlnQ _Z，J，I ²

S _XY＝(lnQ _Z，J，IlnT)-N(ln?Q _Z，J，I×lnT)

$I=\frac{S_{\mathrm{XY}}}{S_X}$

lnK ₃＝lnQ _Z，J，I-I×lnT

LnK ₃Draw K behind the negate ln ₃Value.

Deposit the data i that records in memory cell

The 4th step is in conjunction with i value and K ₁Value is judged gas is outstanding.

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