CN110968829A - Ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing - Google Patents
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Abstract
The invention relates to a ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing, which belongs to the field of mine ventilation resistance measurement and comprises the following steps: s1: based on a mine ventilation system diagram and a mining engineering plan, measuring the ventilation resistance measurement data of all the roadways of the whole mine point by adopting a base point method, and basic data of the total resistance of the mine; s2: carrying out phase difference processing on the air pressure among different measuring points; s3: and on the basis of the air pressure phase difference processing, the ventilation resistance is corrected and calculated. The method can completely avoid the intervention of human factors, greatly shorten the period of ventilation projects such as resistance measurement and the like, greatly improve the accuracy of ventilation resistance calculation data, and provide very important data support for ventilation resistance distribution of the whole mine in a comprehensive and accurate period, later-stage production capacity verification, ventilation system adjustment, ventilation network calculation, dynamic online monitoring and early warning of the ventilation system and the like.
Description
Technical Field
The invention belongs to the field of mine ventilation resistance measurement, and relates to a ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing.
Background
The ventilation resistance measurement is important for mine safety production, and can provide a basis for mine production capacity evaluation, production capacity improvement, safety status evaluation, ventilation system optimization and the like. The ventilation resistance measurement plays an important role in the construction and operation of mines. To date, mine ventilation resistance measurement has been based entirely on manual measurements.
At present, the method for measuring the ventilation resistance of the coal mine mainly depends on the traditional methods such as a base point method, a barometer method and the like, in the process, devices such as a barometer (which may be multifunctional), a dry-wet thermometer, an anemometer and the like are adopted, ventilation system diagrams of all mines are combined, multiple measuring routes are artificially selected, relevant parameters are measured point by point along the routes, then resistance calculation is carried out point by strip by applying a ventilation resistance calculation method based on measured data, and finally the ventilation resistance of the whole mine is obtained through accumulation.
Through the explanation and analysis of the prior main related technologies, the following 4 defects are considered to exist, specifically as follows:
a. there is a large error.
The surface atmospheric pressure fluctuates, and the surface atmospheric fluctuation has certain fluctuation influence on the underground air pressure. In the existing method, data of each measuring point is measured at different time points, and when data is processed later, the fluctuation air pressure is increased and decreased again by applying a base point method, a timer and the like. However, the inventor finds that, based on the background of a large number of ventilation resistance measurement engineering projects, the existing barometer has some defects in precision and accuracy, and the hysteresis of fluctuation disturbance of the air pressure at different points underground on the ground has large errors when the fluctuation air pressure is increased or decreased at a later stage;
b. the measuring route is complicated, and the measuring points are various.
If the primary vent line resistance measurement is performed singly, the workload is relatively small. However, if the ventilation resistance distribution of the whole mine is measured based on such items as on-line monitoring and early warning of the ventilation of the mine and system optimization, it is necessary to measure the resistance of all the ventilation tunnels in the whole mine. For a part of mines with long mining time, long mining lines and complex ventilation networks, the workload is very huge, and time and labor are wasted.
c. Low efficiency and repeated manual measurement.
For a mine, daily ventilation system patrols may be performed. However, all the events related to large system optimization, system adjustment, project development and the like require the whole mine ventilation resistance measurement work. The work needs to be measured again every time when one project is implemented, and the work is repeated continuously and has extremely low efficiency.
d. There is a risk.
In the whole mine ventilation resistance process, resistance measuring personnel are required to enter remote and rugged mine return air tunnels and other positions for working in many times. The conditions of the positions are quite hard, and various conditions such as large gradient, high depth, dark light, large dust, slippery, dark road and the like can exist, so that the positions are extremely easy to touch dangers.
Disclosure of Invention
In view of the above, the present invention is directed to providing a ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing, which aims at solving the problems that the current measurement of ventilation resistance is time-consuming and labor-consuming, and the measurement result is inaccurate.
In order to achieve the purpose, the invention provides the following technical scheme:
a ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing comprises the following steps:
s1: based on a mine ventilation system diagram and a mining engineering plan, measuring the ventilation resistance measurement data of all the roadways of the whole mine point by adopting a base point method, and basic data of the total resistance of the mine;
s2: carrying out phase difference processing on the air pressure among different measuring points;
s3: and on the basis of the air pressure phase difference processing, the ventilation resistance is corrected and calculated.
Further, step S2 specifically includes the following steps:
s21: carrying out 24-hour continuous air pressure monitoring at key positions of a mine, wherein the key positions comprise a main air inlet shaft mouth, a main air inlet of each mining level, an air return port, a main air return shaft wind cave of the mine and a main coal face;
s22: constructing a linkage fluctuation relation spectrogram based on 24-hour continuous air pressure monitoring data of a plurality of monitoring points, comparing wave crests and wave troughs on the air pressure value spectrogram of all key points, and accurately identifying time;
s23: and constructing the time phase difference between different key monitoring points by combining the time difference relation between the peaks and the troughs of the air pressure values of each key point.
Further, in step S23, the air pressure phase shift processing is performed on each key point, specifically: and setting the time of the wave troughs of the ground measuring points as a reference, translating all the air pressure data of the other underground measuring points or all the measuring points until the corresponding time positions of the wave troughs of the other measuring points and the wave troughs of the ground measuring points are the same, and then carrying out data correction processing.
Further, in step S3, based on the atmospheric pressure phase difference processing, the static pressure difference, the level pressure difference, and the dynamic pressure difference between all the measuring points are calculated again, and the resistance of each section of ventilation roadway is calculated, so as to finally obtain the total ventilation resistance of the whole mine through phase difference correction.
The invention has the beneficial effects that: through the realization and the application of the invention, on the basis of the existing ventilation resistance measurement technology, the full mine ventilation resistance condition which is matched with the actual condition can be obtained through direct calculation by adding continuous key measuring point monitoring and phase difference processing correction, the ventilation resistance distribution of the mine and the overall condition can be truly reflected, and the data modification by the human intervention is not needed any more.
The application of the invention can completely avoid the intervention of human factors, greatly shorten the period of ventilation projects such as resistance measurement and the like, greatly improve the accuracy of ventilation resistance calculation data, and provide very important data support for ventilation resistance distribution of all mines in a comprehensive and accurate period, later-stage production capacity verification, ventilation system adjustment, ventilation network calculation, dynamic online monitoring and early warning of the ventilation system and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
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For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic flow chart of a ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing according to the present invention;
FIG. 2 is a schematic view of air pressure fluctuation at 3 different monitoring points of a mine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of periodic fluctuation phase differences of different measuring points of a mine according to an embodiment of the invention;
FIG. 4 is a schematic view of the air pressure phase shift processing of the mine survey point 1 according to the embodiment of the invention;
fig. 5 is a schematic view of the air pressure phase shift processing of the mine survey point 2 according to the embodiment of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1, a ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing includes the following steps:
s1: the latest measuring data of the ventilation resistance of all the roadways of the whole mine are obtained by measuring point by adopting a base point method based on a mine ventilation system graph and an excavation engineering plan.
Firstly, based on a mine ventilation system diagram and an excavation engineering plan, the latest ventilation resistance measurement data of all roadways of the whole mine, the basic data such as the total resistance of the mine and the like are obtained by adopting a traditional base point method to measure point by point.
S2: and (5) processing the air pressure phase difference between different measuring points.
When the ventilation resistance of the whole mine is measured, 24-hour continuous air pressure monitoring is carried out at key positions of a main air inlet shaft wellhead, a main air inlet and an air return inlet of each mining level, a main air return shaft wind tunnel of the mine, a main coal face and the like.
And constructing a linkage fluctuation relation spectrogram based on 24-hour continuous air pressure monitoring data of a plurality of monitoring points, and comparing wave crests and wave troughs on the air pressure value spectrogram of all key points to accurately determine time. And constructing the time phase difference between different key monitoring points by combining the time difference relation between the peaks and the troughs of the air pressure values of each key point.
Fig. 2 is a diagram of continuous 24-hour air pressure monitoring performed for a certain mine. As can be seen from the figure, the atmospheric pressure change trends of the 3 monitoring points are approximately the same, the underground atmospheric pressure is obviously influenced by the ground pressure, only a certain time difference exists, and the time difference of the occurrence of the wave troughs is about 90min and 40min in sequence. In other words, the air pressure is transferred from the ground to the lower point by point, and the fluctuation transfer is performed from the top to the bottom and from the near to the far, so that the air pressure of each underground node is influenced by the fluctuation of the ground air pressure at different times, and the influence amplitude is different.
Therefore, since there is a time difference in the air pressure fluctuation between the respective measurement points, when the ventilation resistance data is processed, the data is processed according to the data of all the measurement points at the same time, which causes the data to be non-uniform, and the calculation has an error. In the process of an actual engineering project, because of the problems, the time for measuring the resistance at each time is long, the resistance can be measured in many days, the data at different moments are processed by referring to the agreement standard, the resistance data of a plurality of roadways are negative values, and the subsequent dynamic calculation of the ventilation resistance of the whole network is greatly influenced. In the past, data modification, debugging and calculation are continuously carried out by means of artificial engineering experience until a certain numerical value is probably reached. However, as a result, there must be a large error between the resistance data calculated by a considerable part of the ventilation tunnels and the actual resistance data, and then a large error influence is caused on data such as air volume distribution calculated by the ventilation network.
By the method, the embarrassment problem of processing data at different moments at the same time can be effectively avoided, the authenticity of the measured resistance data can be restored to a great extent, and the accuracy of the overall conclusion is guaranteed.
Fig. 3 is a schematic diagram of the air pressure fluctuation, which can be described by the sine and cosine formula, after the mathematical model processing is performed on the basis of fig. 2. Each curve corresponds to real-time air pressure values of different measuring points. And it can be seen that the wave troughs of different curves have a certain time difference, and the time difference plays a very important role in accurately correcting the ventilation resistance measurement data.
Fig. 4, 5, is a schematic view of the air pressure phase shift process performed on the measurement points 1 and 2. And setting the time of the wave troughs of the ground measuring points as a reference, translating all the air pressure data of the other underground measuring points or all the measuring points until the corresponding time positions of the wave troughs of the other measuring points and the wave troughs of the ground measuring points are the same. Then, data correction processing is performed as follows:
for downhole station 1, the real available barometric pressure data P-P1',
for downhole station 2, the real available pressure data P-2',
by analogy, for the rest of the measurement points, the real available air pressure data P ═ peother'.
S3: ventilation resistance correction calculation based on air pressure phase difference processing
However, due to the practical situation of engineering, it is impossible to know the continuous fluctuation data of the air pressure of all measuring points and establish the corresponding phase difference relation between the measuring points and the ground. Therefore, the phase processing of all measuring points is carried out by means of the phase difference spectrogram of the air pressure continuous data acquired at key positions of a main air inlet, an air return inlet, a main air return shaft air cave of a mine, a main coal face and the like of each mining level.
For each level, the elevation of the produced level is either approximately horizontal due to normal conditions, or gradually increases from the middle to the sides or to the sides according to a grade of 3% or 5% or the like. For normal ventilation tunnels, the air pressure fluctuation amplitude in the tunnels is relatively small, the air flow rate is large, and the phase difference is generally small or nearly zero.
Therefore, according to the processing method shown in fig. 4 and 5, the air pressure data of the rest measuring points can be approximately processed into the phase position of the air inlet based on the mining level, and then the data is moved forward by one to two.
And then, calculating the static pressure difference, the level pressure difference and the dynamic pressure difference among all the measuring points again, and calculating the resistance of each section of ventilation roadway to finally obtain the total ventilation resistance of the whole mine through phase difference correction.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A ventilation resistance correction calculation method based on air pressure fluctuation phase difference processing is characterized in that: the method comprises the following steps:
s1: based on a mine ventilation system diagram and a mining engineering plan, measuring the ventilation resistance measurement data of all the roadways of the whole mine point by adopting a base point method, and basic data of the total resistance of the mine;
s2: carrying out phase difference processing on the air pressure among different measuring points;
s3: and on the basis of the air pressure phase difference processing, the ventilation resistance is corrected and calculated.
2. The ventilation resistance correction calculation method based on the air pressure fluctuation phase difference processing according to claim 1, characterized in that: step S2 specifically includes the following steps:
s21: carrying out 24-hour continuous air pressure monitoring at key positions of a mine, wherein the key positions comprise a main air inlet shaft mouth, a main air inlet of each mining level, an air return port, a main air return shaft wind cave of the mine and a main coal face;
s22: constructing a linkage fluctuation relation spectrogram based on 24-hour continuous air pressure monitoring data of a plurality of monitoring points, comparing wave crests and wave troughs on the air pressure value spectrogram of all key points, and accurately identifying time;
s23: and constructing the time phase difference between different key monitoring points by combining the time difference relation between the peaks and the troughs of the air pressure values of each key point.
3. The ventilation resistance correction calculation method based on the air pressure fluctuation phase difference processing according to claim 2, characterized in that: in step S23, performing air pressure phase shift processing on each key point, specifically: and setting the time of the wave troughs of the ground measuring points as a reference, translating all the air pressure data of the other underground measuring points or all the measuring points until the corresponding time positions of the wave troughs of the other measuring points and the wave troughs of the ground measuring points are the same, and then carrying out data correction processing.
4. The ventilation resistance correction calculation method based on the air pressure fluctuation phase difference processing according to claim 1, characterized in that: in step S3, based on the atmospheric pressure phase difference processing, the static pressure difference, the level pressure difference and the dynamic pressure difference among all the measuring points are calculated again, the resistance of each section of ventilation roadway is calculated, and finally the total ventilation resistance of the whole mine, which is corrected by the phase difference, is obtained.
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