A method for regulating air in a roadway

Abstract

The present application relates to the technical field of mine underground ventilation, and provides a roadway air regulation method, comprising the following steps: step 1, constructing a mine underground three-dimensional ventilation network model; step 2, measuring actual roadway ventilation data, calculating roadway friction wind resistance, inversely calculating roadway friction resistance coefficient, and correcting the three-dimensional ventilation network model; step 3, designing a roadway air regulation scheme and inputting into the three-dimensional ventilation network model to obtain a pre-regulation three-dimensional ventilation network model; step 4, solving the pre-regulation three-dimensional ventilation network model according to main roadway online monitoring data; step 5, judging whether the monitored air volume of the main roadway and the solved air volume of other roadways are between the minimum required air volume and the maximum allowable air volume, if yes, the air regulation scheme is feasible, and step 6 is entered; if no, the air regulation scheme is adjusted and inputted into the three-dimensional ventilation network model, and step 4 is entered; and step 6, regulating the mine roadway according to the roadway air regulation scheme. The present application can greatly improve the accuracy and efficiency of air regulation, and reduce the air regulation cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine underground ventilation, in particular to a roadway air regulation method. BACKGROUND

[0002] Mine ventilation plays a decisive role in normal operation of the mine. When the air volume in the mine ventilation system cannot meet the demand, air regulation needs to be performed. In the prior art, a theoretically feasible air regulation scheme is usually designed according to measured ventilation data and problems in the ventilation system, and is directly applied to the actual ventilation system without simulation, while the actual ventilation system is much more complex and changeable than in theory, resulting in that the application effect of the air regulation scheme may be unsatisfactory, the scheme needs to be continuously adjusted, time and effort are wasted, and the production is greatly affected. Moreover, in the prior art, ventilation data is obtained by comprehensively measuring the ventilation system, but the mine underground ventilation network is complex, the comprehensive measurement workload is large, and the longer the measurement interval time is, the greater the analysis error is. It can be seen that the existing air regulation method has large error, low efficiency and high cost. SUMMARY

[0003] In view of the problems in the prior art, the present application provides a roadway air regulation method, which greatly improves the accuracy and efficiency of air regulation and reduces the air regulation cost.

[0004] The technical scheme of the present application is as follows:

[0005] A roadway air regulation method comprises the following steps:

[0006] Step 1: constructing a mine underground three-dimensional ventilation network model;

[0007] The three-dimensional ventilation network model distributes the air volume of the roadway network according to air volume balance, air pressure balance and roadway friction air resistance, and the friction resistance coefficient used in the calculation of the roadway friction air resistance is preliminarily set according to the roadway design manual;

[0008] Step 2: correcting the three-dimensional ventilation network model according to measured ventilation data

[0009] The actual ventilation data of the roadway is measured, the roadway friction air resistance is calculated according to the actual ventilation data, the roadway friction resistance coefficient is inversely calculated according to the roadway friction air resistance, the corrected friction resistance coefficient is obtained, the preliminarily set friction resistance coefficient in the three-dimensional ventilation network model is replaced by the corrected friction resistance coefficient, and the three-dimensional ventilation network model is corrected;

[0010] Step 3: designing a roadway air regulation scheme and connecting it to the three-dimensional ventilation network model

[0011] The roadway air regulation scheme is designed, and the air regulation scheme is connected to the three-dimensional ventilation network model, so as to obtain a pre-regulated three-dimensional ventilation network model;

[0012] Step 4: Solving the pre-adjustment wind three-dimensional ventilation network model according to the online monitoring data of the main roadway

[0013] Step 5: Evaluating the air adjustment scheme

[0014] Determine whether the monitored air volume of the main roadway and the calculated air volume of other roadways are between the minimum required air volume and the maximum allowed air volume. If yes, the air adjustment scheme is feasible, and step 6 is entered. If not, adjust the air adjustment scheme, input the adjusted air adjustment scheme into the three-dimensional ventilation network model, and enter step 4;

[0015] Step 6: Adjusting the air of the mine roadway according to the air adjustment scheme of the roadway.

[0016] Further, the step 1 specifically includes the following steps:

[0017] Step 1.1: Extracting the roadway center line using DIMINE digital mining software;

[0018] Step 1.2: Importing the extracted roadway center line into the iVent ventilation optimization platform;

[0019] Step 1.3: Setting the category of the roadway center line; the category includes internal roadway, air inlet roadway, air return roadway, and dead-end closed roadway, and the dead-end closed roadway does not participate in network calculation;

[0020] Step 1.4: Organizing the unconnected roadways to ensure that each roadway is connected within a network;

[0021] Step 1.5: Inputting the wind resistance parameters including friction resistance coefficient, roadway cross-sectional area, and roadway perimeter, calculating the roadway length according to the roadway center line, calculating the roadway friction wind resistance according to the wind resistance parameters and roadway length, and distributing the roadway network air volume according to the wind volume balance, wind pressure balance, and roadway friction wind resistance;

[0022] Step 1.6: Checking the ventilation network according to the topological logical relationship of the ventilation network, correcting the logical relationship error, and obtaining a correct topological logical relationship ventilation network;

[0023] Step 1.7: Adding the known ventilation facilities to the ventilation network;

[0024] Step 1.8: Inputting the fan characteristic curve provided by the fan factory or the measured characteristic curve into the fan database.

[0025] Further, in step 2, the actual ventilation data of the roadway is measured, the roadway friction wind resistance is calculated according to the actual ventilation data, and the roadway friction resistance coefficient is calculated according to the roadway friction wind resistance, specifically including:

[0026] Measuring the actual ventilation data of the roadway includes the cross-sectional size of the roadway, the elevation of each measuring point of the cross section, the wind speed v, the air density, and the absolute pressure;

[0027] According to the size of the roadway section, the area S and the perimeter U of the roadway section are calculated, the air volume Q=Sv of the roadway section is calculated, and the velocity-pressure difference of the measuring section between the two points i and j of the roadway is calculated The position pressure difference Δh 位i-j =Z i gρ i -Z j gρ j ; wherein ρ i is the air density at point i, ρ j is the air density at point j, v i is the air velocity at point i, v j is the air velocity at point j, Z i is the elevation of point i, Z j is the elevation of point j, and g is the acceleration of gravity

[0028] The ventilation resistance h of the measuring section between the two points i and j of the roadway is calculated ij =(ΔP i -ΔP j )-(ΔP 0i -ΔP 0j )+Δh 速i-j +Δh 位i-j , so as to calculate the frictional air resistance R of the measuring section between the two points i and j of the roadway ij =h ij / Q ij 2 ; wherein ΔP i is the static pressure difference at point i, ΔP j is the static pressure difference at point j, ΔP oi is the static pressure difference at the reference point when the pressure is measured at point i, ΔP0j is the static pressure difference at the reference point when the pressure is measured at point j, Q ij is the air volume between points i and j, Q ij =(Q i +Q j ) / 2 when there is no branch and air leakage between the two measuring points, Q ij =Q j when the measuring point is set before the branch and convergence intersection point of the air flow, Q ij =Q i when the measuring point is set after the branch and convergence intersection point of the air flow, and Q i is the air volume at point i, and Q j is the air volume at point j

[0029] The frictional resistance coefficient of the roadway is inversely calculated according to the frictional air resistance of the roadway, and the corrected frictional resistance coefficient α of the measuring section between the two points i and j of the roadway is obtained ij =R ij S 3 / L ij U; wherein Lij is the length of the roadway between points i and j.

[0030] Further, in step 2, the ventilation data of spring, summer and autumn are measured respectively, and the three-dimensional ventilation network model is corrected in sequence by using the measured ventilation data.

[0031] Further, in step 3, the adjustment object in the air regulation scheme includes a roadway, a fan, a wind wall, an air door and an air window, the adjustment means of the roadway, the wind wall and the air door are increasing or decreasing in quantity, the adjustment means of the fan are increasing or decreasing in quantity and improving or reducing in efficiency, the adjustment means of the air window are increasing or decreasing in quantity and increasing or decreasing in wind area, and the air regulation scheme includes at least one adjustment means of at least one air regulation object.

[0032] Further, step 4 includes the following steps:

[0033] Step 4.1: Online monitoring of the main roadway wind speed and inputting into the three-dimensional ventilation network model

[0034] The wind speed sensor is installed at the installation point of the section of the main roadway, the wind speed sensor is used to monitor the wind speed of the roadway section in real time, the wind speed data monitored in real time are input into the corresponding roadway in the three-dimensional ventilation network model according to the roadway number;

[0035] Step 4.2: Correction of the main roadway online monitoring wind speed and calculation of the monitoring air volume

[0036] The relationship function between the wind speed at the installation position of the wind speed sensor and the average wind speed of the whole section of the roadway is determined according to the wind speed characteristics of the roadway section, the average wind speed of the whole section of the main roadway is calculated by using the relationship function according to the wind speed data monitored in real time by all the wind speed sensors at the section of the main roadway, and the monitoring air volume is calculated according to the average wind speed of the whole section and the section area of the roadway.

[0037] Step 4.3: Interpolation of the monitoring air volume of the main roadway and calculation of the air volume of other roadways

[0038] The monitoring air volume of the main roadway is interpolated into the corresponding roadway in the three-dimensional ventilation network model, the monitoring air volume is used to replace the air volume data calculated by the three-dimensional ventilation network model, the air volume of other roadways is calculated by using the interpolated three-dimensional ventilation network model, and the wind speed of the roadway is inversely calculated according to the air volume and the section area of the roadway.

[0039] The beneficial effects of the present application are:

[0040] (1) The present application calculates the friction wind resistance of the roadway by measuring the actual ventilation data of the roadway, thereby inversely calculating the friction resistance coefficient to preliminarily correct the three-dimensional ventilation network model, designs the roadway air regulation scheme and inputs the three-dimensional ventilation network model, solves the pre-regulation three-dimensional ventilation network model according to the online monitoring data of the main roadway, evaluates the air regulation scheme according to the monitoring air volume of the main roadway and the solved air volume of other roadways, and implements the scheme after the air regulation scheme meets the requirements. On the one hand, the simulation and adjustment of the air regulation scheme in the three-dimensional ventilation network model improve the accuracy and efficiency of the air regulation, reduce the manpower, material resources and financial resources, and do not affect the production. On the other hand, the online monitoring data is involved in the real-time solution of the air volume, which greatly improves the accuracy and efficiency of the determination of the air volume of the roadway. The obtained air volume data can accurately reflect the underground ventilation condition and timely reflect the air volume change condition of the underground, thereby assisting the ventilation management personnel to quickly make decisions and formulate reliable air regulation schemes, further improving the accuracy of the air regulation, and obtaining accurate air volumes of all roadways by monitoring only the air speed of the main roadway, greatly reducing the measurement workload and monitoring cost, thereby reducing the air regulation cost.

[0041] (2) The present application calculates the monitoring air volume by monitoring the cross-sectional air speed of the main roadway and correcting the air speed at the installation position of the air speed sensor to the average air speed of the whole cross section of the roadway, and inserts the monitoring air volume of the main roadway into the three-dimensional ventilation network model to solve the air volume of other roadways, thereby improving the calculation accuracy of the monitoring air volume of the main roadway and the solving accuracy of the air volume of other roadways. The obtained air volume data can accurately reflect the underground ventilation condition, and further improve the accuracy of the air regulation. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 The flowchart of the roadway air regulation method of the present application.

[0043] Figure 2 The schematic diagram of the roadway center line after the roadway is combed in the specific embodiment.

[0044] Figure 3 The schematic diagram of the position of the roadway cross section measuring point in the specific embodiment.

[0045] Figure 4 The schematic diagram of the air speed characteristic of a certain roadway cross section with an average air speed of 3 m / s in the specific embodiment.

[0046] Figure 5 The principle diagram of the online monitoring data participating in the solution and evaluation of the air regulation scheme in the specific embodiment. DETAILED DESCRIPTION

[0047] The present application will be further described below in combination with the drawings and specific embodiments.

[0048] As Figure 1As shown, the mine roadway air regulation method of the present application comprises the following steps:

[0049] Step 1: constructing a mine underground three-dimensional ventilation network model;

[0050] The three-dimensional ventilation network model distributes roadway network air volume according to air volume balance, air pressure balance and roadway friction wind resistance, and the friction resistance coefficient used in the calculation of the roadway friction wind resistance is preliminarily set according to the roadway design manual;

[0051] Step 2: correcting the three-dimensional ventilation network model according to the measured ventilation data

[0052] The actual ventilation data of the roadway is measured, the roadway friction wind resistance is calculated according to the actual ventilation data, the roadway friction resistance coefficient is inversely calculated according to the roadway friction wind resistance, the corrected friction resistance coefficient is obtained, and the preliminary set friction resistance coefficient in the three-dimensional ventilation network model is replaced by the corrected friction resistance coefficient to correct the three-dimensional ventilation network model;

[0053] Step 3: designing a roadway air regulation scheme and inputting into the three-dimensional ventilation network model

[0054] The roadway air regulation scheme is designed, and the air regulation scheme is inputted into the three-dimensional ventilation network model to obtain a pre-regulated three-dimensional ventilation network model;

[0055] Step 4: solving the pre-regulated three-dimensional ventilation network model according to the online monitoring data of the main roadway

[0056] Step 5: evaluating the air regulation scheme

[0057] It is judged whether the monitored air volume of the main roadway and the calculated air volume of other roadways are between the minimum required air volume and the maximum allowable air volume, if yes, the air regulation scheme is feasible, and step 6 is entered; if not, the air regulation scheme is adjusted, the adjusted air regulation scheme is inputted into the three-dimensional ventilation network model, and step 4 is entered;

[0058] Step 6: regulating the mine roadway according to the roadway air regulation scheme.

[0059] In this embodiment, the mine roadway is regulated by using the roadway air regulation method of the present application.

[0060] Firstly, a three-dimensional ventilation network model is constructed based on iVent mine ventilation software, specifically comprising the following steps:

[0061] Step 1.1: extracting the roadway center line by using DIMINE digital mining software

[0062] The data source of the iVent mine ventilation system network construction is the roadway center line, and the DIMINE digital mining software is used to construct the three-dimensional roadway center line model. First, the development roadway center line is extracted, including the main inclined shaft, vertical shaft, etc. According to the mine area provided in the “mine area mining atlas”, the three-dimensional mine ventilation shaft roadway model is constructed. Then, the center line of the middle section roadway is extracted one by one from the upper middle section in the DIMINE digital mining software. Next, the middle section ventilation shaft center line is extracted. In the case of unclear ventilation of the raise, it is first constructed into the three-dimensional ventilation system, and then processed according to the confirmation. If it is not ventilated, it will be converted into a sealed roadway. Finally, the synthesized shaft and roadway engineering stereogram including the development shaft, the middle section roadway and the middle section ventilation raise is formed.

[0063] Step 1.2: Import the extracted roadway center line into the iVent ventilation optimization platform

[0064] The center line extracted by the DIMINE digital mining platform does not establish the topology relationship of the shunt, and the extracted roadway center line needs to be imported into the iVent ventilation optimization platform to sort out the topology relationship of the air flow.

[0065] Step 1.3: Set the category of the roadway center line; the category includes internal roadway, air inlet roadway, air return roadway, and dead-end closed roadway, which does not participate in network calculation

[0066] The iVent ventilation optimization platform is used for ventilation network calculation simulation, and all negative pressure ventilation roadways need to be constructed in the calculation simulation system, so the roadway center line is classified and processed. According to the position and relationship of the roadway, the ventilation roadway is divided into four categories: internal roadway, air inlet roadway, air return roadway and dead-end closed roadway.

[0067] Internal roadway: the roadway in the system negative pressure (positive pressure) ventilation network;

[0068] Air inlet roadway: the roadway through which the air volume enters the ventilation system from the ground surface;

[0069] Air return roadway: the roadway through which the air volume is discharged from the ventilation system to the ground surface;

[0070] Dead-end closed roadway: the roadway in the roadway network that cannot be discharged by the system negative pressure (positive pressure), such as the excavation working face and the dead-end roadway without connection, and the sealed roadway. This type of roadway is retained in the roadway network, but does not participate in network calculation.

[0071] Step 1.4: Sort out the unconnected roadways to ensure that each roadway is connected in a network

[0072] The center line extracted by the DIMINE digital mining platform does not connect all the roadways, and the iVent ventilation optimization platform needs to check each roadway to ensure that each roadway has a logical connection. The unconnected roadways need to be sorted out, and the roadway center line map in which each roadway is connected in a network is obtained as shown in Figure 2 .

[0073] Step 1.5: Enter the roadway parameters

[0074] The wind resistance parameters include the friction resistance coefficient, the roadway cross-sectional area, and the roadway perimeter. The roadway length is calculated according to the roadway center line, the roadway friction wind resistance is calculated according to the wind resistance parameters and the roadway length, and the roadway network air volume is distributed according to the air volume balance, the air pressure balance, and the roadway friction wind resistance. In parallel networks, the greater the resistance, the smaller the air volume, and the smaller the resistance, the greater the air volume.

[0075] Step 1.6: Check the ventilation network according to the ventilation network topology logical relationship, correct the logical relationship error, and obtain the correct topology logical relationship ventilation network

[0076] Step 1.7: Add known ventilation facilities to the ventilation network

[0077] Ventilation facilities are air volume and airflow control structures, and are also the key to realizing on-demand ventilation. After network checking, known ventilation facilities are added to the network.

[0078] Step 1.8: Enter the fan characteristic curve provided by the fan factory or the measured characteristic curve into the fan database, and use the fan characteristic curve provided by the manufacturer or the measured characteristic curve for network calculation.

[0079] The friction resistance coefficient in the initially established three-dimensional ventilation network model is preliminarily set according to the roadway design manual. In practice, the friction resistance coefficient is affected by various factors, and there is a deviation between the friction resistance coefficient set according to the roadway design manual and the actual friction resistance coefficient, so it is necessary to correct the friction resistance coefficient by using the measured ventilation data to optimize the three-dimensional ventilation network model. To correct the friction resistance coefficient, the mine ventilation resistance needs to be measured, and the commonly used methods include the differential pressure gauge method and the barometer method. In this embodiment, the barometer point-by-point measurement method is selected, which has the advantages of small instrument volume, light weight, simple, fast, labor-saving and time-saving on-site measurement. During measurement, a CFZZ5 type ventilation comprehensive parameter measuring instrument is placed near the ground wellhead as a base point barometer to monitor the change of the ground surface air pressure, and the base point detector automatically measures and records the atmospheric static pressure change every 1 min; another CFZZ5 type ventilation comprehensive parameter measuring instrument is carried to the underground along the pre-selected measurement route to measure the air pressure, the section size of the roadway, the wind speed, the air temperature and other parameters at the measurement points in turn until the measurement is completed and returns to the reference point. The main measurement principle is that the absolute pressure between the measurement points is measured by the barometer, and then the velocity pressure difference and the position pressure difference are added to calculate the ventilation resistance. The underground on-site measurement group measures the wind speed, the roadway section size, the support material and form and other data of each measurement point according to the measurement scheme, and records well. 20 groups of data are measured for each section to take the average value, and the specific position is shown in Figure 3 .

[0080] In this embodiment, the correction process of the friction resistance coefficient specifically includes:

[0081] The measurement of the actual ventilation data of the roadway includes the section size of the roadway, the elevation of each measurement point, the wind speed v, the air density, and the absolute pressure. Among them, 3 actual measurement wind speed values are taken for each measurement point, and then the arithmetic mean value is taken as the average wind speed of the measurement point, and 20 groups of data are taken for each section of the resistance measuring instrument to take the arithmetic mean value.

[0082] The roadway section area S and the perimeter U are calculated according to the roadway section size.

[0083] The air volume Q of the roadway section is calculated as Q=Sv.

[0084] The velocity pressure difference of the measurement section between the two points i and j of the roadway is calculated as The position pressure difference Δh is calculated as 位i-j =Z i gρ i -Z j gρ j ; wherein, ρ i is the air density of i point, ρ j is the air density of j point, v i is the wind speed of i point, v j is the wind speed of j point, Z i is the elevation of i point, Zj is the height of point j, and g is the acceleration of gravity.

[0085] Calculate the ventilation resistance h of the section between points i and j ij = (ΔP i - ΔP j ) - (ΔP 0i - ΔP 0j ) + Δh 速i-j + Δh 位i-j , so as to calculate the friction wind resistance R of the section between points i and j ij = h ij / Q ij 2 ; wherein ΔP i is the static pressure difference of point i, ΔP j is the static pressure difference of point j, ΔP oi is the reference point static pressure difference when measuring the pressure at point i, ΔP ij is the reference point static pressure difference when measuring the pressure at point j, Q ij is the air volume between points i and j, when there is no branch and air leakage between the two measuring points Q i = (Q j + Q j ) / 2, when there is a branch between the two measuring points and the measuring point is set before the intersection point of the air flow, Q ij = Q j , when there is a branch between the two measuring points and the measuring point is set after the intersection point of the air flow, Q ij = Q i , and Q i is the air volume of point i, and Q j is the air volume of point j.

[0086] According to the friction wind resistance of the roadway, the friction resistance coefficient of the roadway is calculated, and the corrected friction resistance coefficient of the section between points i and j is obtained ij = R ij S 3 / L ij U; wherein L ij is the length of the roadway between points i and j.

[0087] In this embodiment, the ventilation data of spring, summer and autumn are measured respectively, and the ventilation data measured in spring, summer and autumn are used to correct the three-dimensional ventilation network model in turn, so that the three-dimensional ventilation network model more accurately reflects the underground ventilation condition.

[0088] In the step 3, the adjustment object in the air regulation scheme includes a roadway, a fan, a wind wall, an air door, and a wind window, the adjustment means of the roadway, the wind wall, and the air door are increasing or decreasing the number, the adjustment means of the fan is increasing or decreasing the number or increasing or decreasing the efficiency, and the adjustment means of the wind window is increasing or decreasing the number or increasing or decreasing the wind area, and the air regulation scheme includes at least one adjustment means of at least one air regulation object.

[0089] After the designed air regulation scheme is connected to the three-dimensional ventilation network model, the pre-adjusted three-dimensional ventilation network model needs to be calculated according to the measured data. Since there are a large number of roadways in the mine, it is difficult to monitor the air volume of all roadways due to the consumption of a large amount of manpower, material resources and financial resources. Therefore, the present application selects the main roadway for real-time air volume monitoring, and calculates the air volume of other roadways by using the three-dimensional ventilation network model according to the monitoring data of the main roadway, which can save cost and obtain sufficient calculation accuracy.

[0090] The present application sets an installation point on the section of the main roadway to install a wind speed sensor, and uses the wind speed sensor to monitor the wind speed of the roadway section in real time. Figure 4 As shown in the figure, the wind speed at different positions of the roadway section is mostly different, so the data monitored by the wind speed sensor does not represent the average wind speed of the roadway, and the wind speed needs to be further corrected according to the wind speed characteristics of the whole section of the roadway. Specifically, a relationship function between the wind speed at the installation position of the wind speed sensor and the average wind speed of the whole section of the roadway is determined according to the wind speed characteristics of the roadway section, the average wind speed of the whole section of the main roadway is calculated by using the relationship function according to the real-time monitoring wind speed data of all wind speed sensors at the section of the main roadway, and the monitoring air volume is calculated according to the average wind speed of the whole section and the area of the roadway section. After the monitoring air volume is calculated by real-time correction of the wind speed, the monitoring air volume needs to be interpolated into the corresponding roadway in the three-dimensional ventilation network model, the monitoring air volume and the wind direction are interpolated to fix the monitoring roadway calculation data, the monitoring data is used to replace the original model static calculation data, and the three-dimensional ventilation network model after interpolation is used to calculate the air volume of other roadways. In the present embodiment, the step 4 includes the following steps:

[0091] Step 4.1: Online monitoring of the wind speed of the main roadway and connection to the three-dimensional ventilation network model

[0092] The wind speed sensor is installed at the installation point on the section of the main roadway, the wind speed of the roadway section is monitored in real time by using the wind speed sensor, and the real-time monitoring wind speed data is connected to the corresponding roadway in the three-dimensional ventilation network model according to the roadway number;

[0093] Step 4.2: Correction of the online monitoring wind speed of the main roadway and calculation of the monitoring air volume

[0094] The relationship function between the wind speed of the wind speed sensor installation position determined according to the wind speed characteristics of the roadway section and the average wind speed of the whole section of the roadway is determined, the average wind speed of the whole section of the main roadway is calculated according to the wind speed data monitored by all the wind speed sensors at the section of the main roadway in real time by using the relationship function, and the monitoring air volume is calculated according to the average wind speed of the whole section and the section area of the roadway.

[0095] Step 4.3: Interpolating the monitoring air volume of the main roadway and calculating the air volume of other roadways

[0096] The monitoring air volume of the main roadway is interpolated into the corresponding roadway in the three-dimensional ventilation network model, the air volume data calculated by the three-dimensional ventilation network model is replaced by the monitoring air volume, the air volume of other roadways is calculated by using the interpolated three-dimensional ventilation network model, and the wind speed of the roadway is inversely calculated according to the air volume and the section area of the roadway.

[0097] After obtaining the monitoring air volume of the main roadway and the calculated air volume of other roadways, the evaluation of the air regulation scheme is performed, the scheme is implemented after the air regulation scheme meets the requirements, the simulation and adjustment of the air regulation scheme in the three-dimensional ventilation network model are realized, the accuracy and efficiency of air regulation are improved, the manpower, material resources and financial resources are reduced, and the production is not affected.

[0098] In the embodiment, as shown in FIG. 1, the measured data is used to participate in the calculation of the three-dimensional ventilation network model and the evaluation of the air regulation scheme. Figure 5 The measured data is used to participate in the calculation of the three-dimensional ventilation network model and the evaluation of the air regulation scheme. The measured data as first-hand information needs to be saved for a long time, can be used to compare the ventilation effects in different periods, evaluate various air regulation schemes, and through the import of the measured data into the three-dimensional ventilation network model by associating corresponding parameter fields, the integrated management and parameter visual management of the measured data and the three-dimensional ventilation network model are realized, and the data format is defined for import and export, convenient maintenance and management; the measured wind speed and section are interpolated and fixed into the corresponding monitoring roadway, the monitoring air volume and the wind direction are interpolated and fixed into the measured roadway calculation data, the original model data is replaced by the measured data; the measured ventilation data is used to calculate the roadway friction wind resistance, so as to inversely calculate the friction resistance coefficient to correct the three-dimensional ventilation network model; the measured data is used to participate in the calculation of the three-dimensional ventilation network model, the measured data is integrated and visualized, the three-dimensional ventilation network model obtains the measured wind speed, and the data is corrected and automatically or manually calculated in time as needed, so that the wind speed of the main roadway is monitored, the ventilation system is dynamically and comprehensively monitored and analyzed, the investment and maintenance of the monitoring system are reduced, the comprehensiveness and stability of the monitoring system are improved, underground ventilation problems are found in time, which is conducive to improving the efficiency of checking ventilation hidden dangers; the measured result parameters and the corrected three-dimensional ventilation network model are used to quickly build an air regulation scheme, the system quickly calculates and analyzes, the effect of the air regulation scheme is evaluated, the air volume of each roadway is alarmed and prompted, the air regulation scheme is optimized, and the air regulation effect is improved.

[0099] Obviously, the above embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The above embodiments are only used for explaining the present application, and do not constitute limitation on the protection scope of the present application. Based on the above embodiments, all other embodiments obtained by those skilled in the art without creative labor, i.e. all modifications, equivalent replacements and improvements, etc. made within the spirit and principle of the present application, fall within the protection scope of the present application.

Claims

1. A method for adjusting ventilation in roadways, characterized in that, Includes the following steps: Step 1: Construct a three-dimensional ventilation network model for underground mines; The three-dimensional ventilation network model allocates the air volume of the roadway network according to the air volume balance, air pressure balance and roadway friction resistance. The friction resistance coefficient used in the roadway friction resistance calculation is initially set according to the roadway design manual. Step 2: Correct the 3D ventilation network model based on measured ventilation data. Measure the actual ventilation data of the roadway, calculate the roadway frictional resistance based on the actual ventilation data, and back-calculate the roadway frictional resistance coefficient based on the roadway frictional resistance to obtain the corrected frictional resistance coefficient. Use the corrected frictional resistance coefficient to replace the frictional resistance coefficient initially set in the three-dimensional ventilation network model to correct the three-dimensional ventilation network model. The measurement of actual ventilation data in the roadway, the calculation of roadway frictional resistance based on the actual ventilation data, and the inverse calculation of the roadway frictional resistance coefficient based on the roadway frictional resistance specifically include: The actual ventilation data of the roadway includes the cross-sectional dimensions of the roadway and the elevation, wind speed v, air density, and absolute pressure of each measuring point on the cross-section; Calculate the cross-sectional area S and perimeter U of the tunnel based on the tunnel cross-sectional dimensions, calculate the cross-sectional air volume Q = Sv, and calculate the velocity-pressure difference between the measurement sections at points i and j in the tunnel. , Potential pressure difference Δh 位i-j =Z i gρ i -Z j gρ j ; where ρ i Let ρ be the air density at point i. j Let v be the air density at point j. i Let i be the wind speed, and v be the wind speed. j Let the wind speed at point j be Z. i Let Z be the elevation of point i. j Let j be the elevation of point j, and g be the acceleration due to gravity. Calculate the ventilation resistance h of the section between points i and j in the roadway. ij =(ΔP) i -ΔP j )-(ΔP 0i -ΔP 0j )+Δh 速i-j +Δh 位i-j This allows for the calculation of the frictional resistance R of the measured section between points i and j in the tunnel. ij =h ij / Q ij 2 ; where ΔP i Let ΔP be the static pressure difference at point i. j Let ΔP be the static pressure difference at point j. oi Let ΔP be the static pressure difference at the reference point when the pressure is measured at point i. 0j Let Q be the static pressure difference at the reference point when the pressure is measured at point j. ij Q represents the airflow between points i and j, where there are no branches or air leakage between the two measuring points. ij =(Q i +Q j Q / 2, when there is a branch between the two measuring points and the measuring point is set before the intersection of the airflow divergence and convergence. ij =Q j When there is a branch between the two measuring points, and the measuring point is set after the intersection of the airflow divergence and convergence, Q ij =Q i Q i For the air volume at point i, Q j Let j be the air volume; The roadway friction resistance coefficient is calculated by back-calculating the roadway frictional wind resistance, and the corrected friction resistance coefficient ∝ is obtained for the section between points i and j in the roadway. ij =R ij S 3 / L ij U; where L ij Let be the length of the tunnel between points i and j; Step 3: Design the ventilation scheme for the tunnel and integrate it into the 3D ventilation network model. Design a ventilation adjustment scheme for the alleyway and integrate the ventilation adjustment scheme into a three-dimensional ventilation network model to obtain a three-dimensional ventilation network model for pre-adjusted ventilation; Step 4: Calculate the three-dimensional ventilation network model for pre-adjusted airflow based on the online monitoring data of the main roadways. Step 5: Evaluate the air conditioning plan Determine whether the monitored air volume of the main roadway and the calculated air volume of other roadways are between the minimum required air volume and the maximum allowable air volume. If so, the air adjustment scheme is feasible and proceed to step 6; otherwise, adjust the air adjustment scheme and connect the adjusted air adjustment scheme to the three-dimensional ventilation network model and proceed to step 4. Step 6: Adjust the ventilation in the mine roadways according to the roadway ventilation plan.

2. The tunnel ventilation adjustment method according to claim 1, characterized in that, Step 1 specifically includes the following steps: Step 1.1: Use DIMINE digital mining software to extract the centerline of the tunnel; Step 1.2: Import the extracted tunnel centerline into the iVent ventilation optimization platform; Step 1.3: Classify the centerline of the roadway; the categories include internal roadways, intake roadways, return air roadways, and single-ended closed roadways. Single-ended closed roadways do not participate in the network solution. Step 1.4: Identify and connect disconnected alleyways to ensure that each alleyway is connected within a network; Step 1.5: Input the air resistance parameters, including the friction resistance coefficient, the cross-sectional area of ​​the roadway, and the perimeter of the roadway. Calculate the roadway length based on the roadway centerline. Calculate the roadway friction resistance based on the air resistance parameters and the roadway length. Allocate the air volume of the roadway network based on the air volume balance, air pressure balance, and roadway friction resistance. Step 1.6: Check the ventilation network according to the topological logical relationship, correct logical relationship errors, and obtain the correct topological logical relationship ventilation network; Step 1.7: Add known ventilation facilities to the ventilation network; Step 1.8: Enter the wind turbine characteristic curves provided by the manufacturer or the measured characteristic curves into the wind turbine database.

3. The tunnel ventilation adjustment method according to claim 1, characterized in that, In step 2, ventilation data for spring, summer, and autumn / winter are measured respectively, and the three-dimensional ventilation network model is corrected sequentially using the measured ventilation data.

4. The tunnel ventilation method according to claim 1, characterized in that, In step 3, the air conditioning scheme includes adjustments to roadways, fans, air walls, air doors, and air windows. The adjustment methods for roadways, air walls, and air doors are to increase or decrease their quantity. The adjustment methods for fans are to increase or decrease their quantity and improve or reduce their efficiency. The adjustment methods for air windows are to increase or decrease their quantity and increase or decrease their air passage area. The air conditioning scheme includes at least one adjustment method for at least one air conditioning object.

5. The tunnel ventilation method according to claim 1, characterized in that, Step 4 includes the following steps: Step 4.1: Monitor the wind speed in the main roadways online and integrate it into the three-dimensional ventilation network model. Wind speed sensors are installed at designated points on the cross-section of the main roadway. The wind speed sensors are used to monitor the wind speed on the roadway cross-section in real time. The real-time wind speed data is then connected to the corresponding roadway in the three-dimensional ventilation network model according to the roadway number. Step 4.2: Correct the online monitoring wind speed in the main roadway and calculate the monitored air volume. The relationship function between the wind speed at the installation location of the wind speed sensor and the average wind speed of the entire cross section of the roadway is determined based on the wind speed characteristics of the roadway cross section. The average wind speed of the entire cross section of the main roadway is calculated using the relationship function based on the wind speed data monitored in real time by all wind speed sensors at the cross section of the main roadway. The monitored air volume is calculated based on the average wind speed of the entire cross section and the cross section area of ​​the roadway. Step 4.3: Interpolate the monitoring air volume of the main roadway and calculate the air volume of other roadways. The monitored air volume of the main roadway is interpolated into the corresponding roadway in the three-dimensional ventilation network model. The monitored air volume is used to replace the air volume data calculated by the three-dimensional ventilation network model. The interpolated three-dimensional ventilation network model is used to calculate the air volume of other roadways. The wind speed of the roadway is calculated back based on the air volume and cross-sectional area of ​​the other roadways.

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