CN109281698B - Mine ventilation resistance determination data processing method based on relative pressure - Google Patents
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- E—FIXED CONSTRUCTIONS
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- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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Abstract
The invention relates to a relative pressure-based mine ventilation resistance measurement data processing method, which comprises the following steps: selecting a wellhead of a mine as a relative pressure zero point; calculating the relative pressure of all other measuring points; correcting the relative pressure of the wrong measuring point; calculating wind resistance of the ventilation network branch; the wind resistance of the ventilation network branch is corrected. The mine ventilation resistance measurement data processing method based on the relative pressure can avoid the situation that the roadway resistance value is negative frequently during the data processing of the barometer base point method in the conventional mine ventilation resistance measurement.
Description
The technical field is as follows:
the invention relates to a method for processing original data for measuring ventilation resistance of a coal mine, in particular to a method for processing original data obtained by measuring ventilation resistance of a mine by adopting a barometer base point method.
Background art:
the mine ventilation resistance measurement is one of important contents of ventilation technology management work and is the only means for acquiring mine ventilation basic parameters. The one hundred and fifty-six rules of coal mine safety regulations (2016 edition): the ventilation resistance of the mine must be measured 1 time before the new well is put into production, and at least 1 time every 3 years later. After the production mine is shifted to a new level of production, and a wing is changed or the ventilation system of the whole mine is changed, the ventilation resistance measurement of the mine must be carried out again. Through resistance measurement, a large amount of mine ventilation original technical data can be obtained, a basis is provided for economically and reasonably optimizing a mine ventilation system and making mine ventilation safety technical measures, and necessary basic data support can be provided for wind flow control, adjustment and emergency rescue and disaster relief in a mine catastrophe period.
The barometer base point method is one of the common methods for measuring mine ventilation resistance, and has the advantages of relatively small measuring workload and high measuring speed, but the accuracy of the obtained original data is relatively low, and the conventional method often has negative number when the resistance of the roadway branch is calculated. When the measured data with the roadway resistance being negative is manually corrected, the data is usually corrected by the experience of data processing personnel, and the accuracy is lacked; and after the resistance value of a certain roadway is corrected, how to correct the resistance value of the roadway connected with the roadway is also a problem which is difficult to process.
The invention content is as follows:
the invention aims to provide a relative pressure-based mine ventilation resistance measurement data processing method aiming at the defects of the prior art, which can reduce the processing difficulty of the original data obtained by measuring the mine ventilation resistance by using a barometer base point method, and particularly has remarkable advantages when a roadway resistance value with a negative calculation result is corrected.
In order to achieve the aim, the invention provides a relative pressure-based mine ventilation resistance measurement data processing method, which comprises the following steps:
selecting a well mouth of a certain person in a mine as a relative pressure zero point, selecting an air inlet of the mine as the relative pressure zero point if the mine adopts an extraction type ventilation method, and selecting an air outlet of the mine as the relative pressure zero point if the mine adopts a press-in type ventilation method.
Step two, calculating the relative pressure of all other measuring points, wherein the calculation formula is as follows:
in the formula: i is the serial number of the measuring points, and the sequence is manually carried out, so that the uniqueness is required to be ensured; p is a radical ofPhase iRelative pressure of a measuring point i relative to a zero point of the relative pressure, which is called the relative pressure of the measuring point i for short, and unit Pa; k 'and k' are correction coefficients of the barometers I and II respectively; p ″)i、p″0Respectively reading the barometer II at a measuring point i and a relative pressure zero point in a unit Pa; p'i、p′0Are respectively and p ″)i、p″0Reading of the barometer I corresponding to time in Pa; rhoi0Is the average value of the air density between the point i and the zero point of the relative pressure in kg/m3；zi、z0Respectively measuring the elevation of a point i and a relative pressure zero point in a unit m; rhoi、ρ0Air density in kg/m at the i measurement point and the zero point of the relative pressure3；vi、v0The wind speed is measured at the point i and the zero point of the relative pressure in m/s.
Step three: correcting the relative pressure of the measuring point, and the specific method comprises the following steps:
sequencing the relative pressures of all measuring points according to the airflow direction of the mine, wherein the correct relative pressure of the measuring points conforms to the following principle: if the mine adopts an extraction type ventilation method, the relative pressure is reduced from the zero point of the relative pressure to the main fan drift of the mine; if the mine adopts a press-in type ventilation method, the relative pressure is increased from the zero point of the relative pressure to the main fan drift of the mine in sequence. If the relative pressure of the measuring points does not accord with the principle, correction is carried out. The correcting method is that according to the relative pressure difference between the front and back measuring points of the measuring point, the resistance of the front and back ventilation network branch of the measuring point is roughly estimated according to the physical parameters (including length, section area, perimeter, etc.) and air volume of the tunnel between the measuring point and the front and back measuring points of the measuring point, and then the corrected relative pressure of the measuring point is calculated according to the sum or difference between the estimated resistance value of one ventilation network branch and the relative pressure of the other corresponding measuring point. According to the method, the relative pressure of all the measuring points which do not accord with the principle is corrected.
Step four: calculating the wind resistance of the ventilation network branch by the following calculation formula:
in the formula: r is wind resistance of ventilation network branch, unit Ns2/m8(ii) a h is the resistance of the ventilation network branch, and the value is the difference of the relative pressures of the air flow inflow measuring point and the air flow outflow measuring point of the ventilation network branch, and the unit is Pa; q is the branched air quantity of the ventilation network, unit m3/s。
Step five: the method for correcting the wind resistance of the branch of the ventilation network comprises the following specific steps:
after the branch wind resistance values of the ventilation network are subjected to standardization processing and the natural wind pressure of the whole mine is calculated, the parameters and the working characteristic curve of the main fan of the mine are used as corresponding branch attributes of the ventilation network and input into a ventilation network graph drawn by mine ventilation simulation software, and the simulation calculation of the mine ventilation network is carried out, so that the simulation wind volume of all the branches of the ventilation network can be calculated. Comparing the calculated simulated air volume with the actual air volume of the corresponding ventilation network branch during the resistance measurement period, and if the error is within 5%, indicating that the obtained ventilation network branch air resistance accords with the actual mine situation; if the error is more than 5%, the wind resistance of the corresponding ventilation network branch needs to be corrected until the air volume contrast error of all the roadways reaches within 5%.
After the technical scheme is adopted, the invention has the following positive effects: the mine ventilation resistance measurement data processing method based on the relative pressure can avoid the situation that the roadway resistance value is negative frequently during the data processing of the barometer base point method in the conventional mine ventilation resistance measurement.
Description of the drawings:
FIG. 1 is a flow chart of a method of the present invention for processing data from a relative pressure based determination of mine ventilation resistance;
fig. 2 is a schematic view of a mine ventilation network of the present invention.
The specific implementation mode is as follows:
the following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention more readily understood by those skilled in the art, and thus will more clearly and distinctly define the scope of the invention.
As shown in fig. 1, the method for processing data of mine ventilation resistance measurement based on relative pressure provided by the invention comprises the following steps:
s1: selecting a relative pressure zero point. As shown in fig. 2, if the mine adopts an extraction type ventilation method, a measuring point 1 is selected as a relative pressure zero point; and if the mine adopts a press-in ventilation method, selecting the measuring point 6 as a relative pressure zero point. Taking the mine adopting the extraction type ventilation method as an example, the following description shows that p is p when the measuring point 1 is selected as the zero point of the relative pressure1 phaseIs 0.
S2: the relative pressures at the other stations are calculated. According to the following calculation formula:
the relative pressure p of the measuring points 2, 3, 4, 5 and 6 is respectively calculated2 phase of、p3 phase (C)、p4 phase of、pPhase 5、p6 phases of。
S3: the relative pressure at the measurement points is corrected. According to the mine wind flow direction as shown in fig. 2, the correct measuring point relative pressure should conform to: p is a radical of1 phase＞p2 phase of＞p3 phase (C)＞pPhase 5＞p6 phases ofAnd p1 phase＞p2 phase of＞p4 phase of＞pPhase 5＞p6 phases of。
If the calculated measurement point relative pressure satisfies the above-described rule, the process proceeds to S4.
If the calculated measuring point relative pressure does not accord with the principle, the measuring point relative pressure needs to be corrected. Suppose is provided with p3 phase (C)＜pPhase 5The correction method is based on the relative pressure difference h between the measuring point 2 and the measuring point 525And then according to the physical parameters (including length, cross-sectional area, perimeter and the like) and air volume of the roadway between the measuring points 3 and 2 and between the measuring points 3 and 5, the resistance h of the branches (2, 3) and (3, 5) of the ventilation network is roughly estimated23And h35。h25、h23、h35Satisfy h25＝h23+h35. Then according top2 phase ofMinus h23Or pPhase 5Plus h35The corrected relative pressure p 'at measurement point 3 is calculated as a result of (1)'3 phase (C). Then utilize p'3 phase (C)Substitution of p3 phase (C)Proceed to S4.
S4: wind resistance of the ventilation network branch is calculated. Firstly, the resistance h of all the branches of the ventilation network is calculated according to the description in step four of the invention12、h23、h35、h56、h24、h45(ii) a Then calculating the wind resistance R of all the ventilation network branches according to the formula in the fourth step of the invention content12、R23、R35、R56、R24、R45。
S5: the wind resistance of the ventilation network branch is corrected. R is to be12、R23、R35、R56、R24、R45After the standardization processing is carried out and the natural wind pressure of the mine is calculated, the obtained parameters and the working characteristic curve of the main fan of the mine are used as the corresponding branch attributes of the ventilation network and are input into a ventilation network graph drawn by mine ventilation simulation software, the simulation calculation of the mine ventilation network is carried out, and the simulated wind quantity Q of all the ventilation network branches is calculated12、Q23、Q35、Q56、Q24、Q45. Will Q12、Q23、Q35、Q56、Q24、Q45Comparing with the actual air volume of the corresponding ventilation network branch during the resistance measurement period, and if the error is within 5 percent, indicating that R is12、R23、R35、R56、R24、R45The method accords with the actual conditions of the mine; if the error is more than 5%, the wind resistance of the corresponding ventilation network branch needs to be corrected until the simulated wind quantity Q12、Q23、Q35、Q56、Q24、Q45The error of the actual air volume of the corresponding ventilation network branch in the resistance measuring period is within 5%.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (3)
1. A relative pressure-based mine ventilation resistance measurement data processing method is characterized by comprising the following steps:
step one, selecting a wellhead of a mine as a relative pressure zero point;
step two, calculating the relative pressure of all other measuring points, wherein the calculation formula is as follows:
in the formula: i is the serial number of the measuring point; p is a radical ofPhase iThe relative pressure of the measuring point i relative to the zero point of the relative pressure is in unit Pa; k 'and k' are respectively the correction coefficients of barometers I and II; p ″)i、p″0Respectively reading the barometer II at a measuring point i and a relative pressure zero point in a unit Pa; p'i、p′0Are respectively and p ″)i、p″0Reading of the barometer I corresponding to time in Pa; rhoi0Is the average value of the air density between the point i and the zero point of the relative pressure in kg/m3；zi、z0Respectively measuring the elevation of a point i and a relative pressure zero point in a unit m; rhoi、ρ0Air density in kg/m at the i measurement point and the zero point of the relative pressure3；vi、v0Respectively measuring the wind speed of a point i and a relative pressure zero point in m/s;
step three, correcting the relative pressure of the wrong measuring point: sequencing the relative pressures of all measuring points according to the airflow direction of the mine, estimating the resistance of a front ventilation network branch and a rear ventilation network branch where the measuring point is located according to the difference between the relative pressures of the front measuring point and the rear measuring point of the measuring point and the physical parameters and air volume of a roadway between the measuring point and the front measuring point and the rear measuring point of the measuring point, and calculating the corrected relative pressure of the measuring point according to the sum or difference between the estimated resistance value of one ventilation network branch and the relative pressure of the other corresponding measuring point, so that the relative pressures of all the measuring points with errors are corrected by the method;
step four: calculating the wind resistance of the ventilation network branch by the following calculation formula:
in the formula: r is wind resistance of ventilation network branch, unit Ns2/m8(ii) a h is the resistance of the ventilation network branch, and the value is the difference of the relative pressures of the air flow inflow measuring point and the air flow outflow measuring point of the ventilation network branch, and the unit is Pa; q is the branched air quantity of the ventilation network, unit m3/s；
Step five: correcting the wind resistance of the ventilation network branches: after the branch wind resistance values of the ventilation network are subjected to standardization processing and the natural wind pressure of the whole mine is calculated, the parameters and the working characteristic curve of the main fan of the mine are taken as the corresponding branch attributes of the ventilation network and input into a ventilation network graph drawn by mine ventilation simulation software, and the simulation calculation of the mine ventilation network is carried out, so that the simulation wind volume of all the branches of the ventilation network can be calculated; and comparing the calculated simulated air volume with the actual air volume of the corresponding ventilation network branch during the resistance measurement period, if the error is within 5%, indicating that the obtained wind resistance of the ventilation network branch accords with the actual condition of the mine, and if the error is above 5%, correcting the wind resistance of the corresponding ventilation network branch until the air volume comparison errors of all the roadways are within 5%.
2. The relative pressure-based mine ventilation resistance measurement data processing method according to claim 1, characterized in that in the first step, if the mine adopts a draw-out ventilation method, an air inlet into the mine is selected as a relative pressure zero point; and if the mine adopts a press-in ventilation method, selecting a mine air outlet as a relative pressure zero point.
3. The method for processing the mine ventilation resistance measurement data based on the relative pressure as claimed in claim 2, wherein in the third step, the correct measuring point relative pressure is in accordance with the following principle: if the mine adopts an extraction type ventilation method, the relative pressure is reduced from the zero point of the relative pressure to the main fan drift of the mine; if the mine adopts a press-in type ventilation method, the relative pressure is increased from the zero point of the relative pressure to the main fan drift of the mine in sequence.
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| CN110968829B (en) * | 2019-11-27 | 2023-04-14 | 重庆科技学院 | Ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing |
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