CN113901737A

CN113901737A - Method and device for calculating mine ventilation network

Info

Publication number: CN113901737A
Application number: CN202111155104.6A
Authority: CN
Inventors: 曲佳佳; 张古强; 梁志斌; 齐振国; 韩大伟; 李春喜
Original assignee: Business Intelligence Of Oriental Nations Corp ltd
Current assignee: Business Intelligence Of Oriental Nations Corp ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-01-07

Abstract

The invention provides a method and a device for resolving a mine ventilation network. The method comprises the following steps: based on a wind resistance value simplifying method, in an original ventilation network diagram, simplifying a local wind network meeting preset conditions into a branch to obtain a first ventilation network diagram; determining a minimum tree and remaining branches with an exit well or an entry well as a root node based on the first ventilation network graph; and determining a calculation result of the original ventilation network graph based on the depths of the residual branches and a correction algorithm. According to the method for calculating the mine ventilation network, the complex mine ventilation network diagram is simplified through a wind resistance value simplification method, the minimum tree and the residual branches are generated based on the simplified ventilation network diagram, and the calculation result of each branch in the original ventilation network diagram is determined according to the depth of the residual branches and a correction algorithm. The method can improve the resolving speed, and simultaneously adopts a more reasonable iterative calculation initial value assigning mode, thereby improving the resolving stability and the resolving efficiency.

Description

Method and device for calculating mine ventilation network

Technical Field

The invention relates to the technical field of mine ventilation, in particular to a method and a device for calculating a mine ventilation network.

Background

The mine ventilation system is an engineering system consisting of a ventilation network for supplying fresh air and exhausting foul air to various underground operation sites, a ventilation power and ventilation control facility and the like. Fresh air is sent into the underground for workers to breathe, dilute and remove toxic and harmful explosive gases and the like which are gushed during mining, so that the fresh air has important influence on the safety production of mines and is a basic project of the mines. The mine ventilation network calculation can provide reference for design, modification and the like of the mine ventilation system, and is a basic support of the mine ventilation system.

At present, various computer software systems for calculating the ventilation network are available at home and abroad, and the software systems greatly simplify the difficulty of calculating the ventilation network of the mine and improve the design efficiency and the safety of a ventilation system. However, in practical use, the software has the problems that the complex ventilation network has slow resolving speed and the iterative process is easy to diverge.

The important reason that the calculation speed is low and the calculation is easy to disperse is that the initial air volume given to each remaining branch is greatly different from the actual situation when the ventilation network is subjected to iterative calculation. At present, the commonly used method for assigning initial values is to assign fixed initial values to the rest branches, such as 10m³And/min. However, for many mines, the air volume of the roadway or part of the roadway is far away from the initial value, even by tens of times or nearly hundreds of times. This results in a large number of iterations in the calculation process, and even in a case where the iterative calculation diverges. In addition, the actual mine ventilation network system is complex, and has various branch relations such as series connection, parallel connection, angle connection and the like, so that the ventilation network has more unknown quantity and more equation set equations and equations during calculation, and the calculation process of the ventilation network is complex and the iterative calculation is not easy to converge.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a method and a device for calculating a mine ventilation network.

In a first aspect, the present invention provides a method of mine ventilation network solution, comprising:

based on a wind resistance value simplifying method, in an original ventilation network diagram, simplifying a local wind network meeting preset conditions into a branch to obtain a first ventilation network diagram;

determining a minimum tree and remaining branches with an exit well or an entry well as a root node based on the first ventilation network graph;

determining a calculation result of the original ventilation network diagram based on the depth of the residual branches and a correction algorithm;

the preset condition is that the wind resistance of each branch in the local wind network in the original ventilation network diagram is smaller than a preset multiple of the mean value of the wind resistances of other branches, and the number of the connecting points of the branches and other branches obtained by simplifying the local wind network is only two; the calculation result comprises the air volume and the air pressure of each branch in the original ventilation network diagram.

Optionally, the wind resistance of the branch obtained by simplifying the local wind network is the wind resistance of the branch with the largest wind resistance value in the local wind network.

Optionally, the determining, based on the first ventilation network map, a minimum tree and remaining branches with an exit well or an entry well as a root node includes:

determining the weight of each branch and sequencing the weights based on the first ventilation network diagram;

based on the weight of each branch, determining a minimum tree and the rest branches in the first ventilation network diagram by taking an outlet well or an inlet well as a root node with the minimum sum of the weights of each branch as a target;

the weight of each branch is determined according to the product of the branch air volume and the wind resistance, and if the air volume is unknown, the weight is determined according to the branch wind resistance.

Optionally, the determining a calculation result of the original ventilation network map based on the depths of the remaining branches and the correction algorithm includes:

determining the initial air quantity value of each residual branch based on the depths of the nodes at the two ends of the residual branches and the number of the minimum tree nodes with the same depths as the nodes at the two ends respectively;

based on a Scott-Hisley algorithm, correcting the loop air volume of each residual branch until the loop air volume meets a preset precision range, and determining the final result of the loop air volume;

and determining a calculation result of the original ventilation network based on the final result of the air volume of each loop.

Optionally, the modifying, based on the Scott-Hisley algorithm, the loop air volume where the remaining branches are located until the loop air volume meets a preset precision range, and determining a final result of the loop air volume includes:

if the branch of the natural wind pressure exists, initializing the wind pressure value of the branch of the natural wind pressure;

if the branch of the fan exists, fitting a fan characteristic curve based on the initial air volume, and initializing the air pressure value of the branch of the fan;

determining the corrected value of the air volume of the loop where each remaining branch is located based on a loop air volume correction formula in a Scott-Hisley algorithm;

if the corrected value of the air volume of the loop does not meet the preset precision range and the iteration times are smaller than the preset threshold value, updating the corrected value of the loop where each remaining branch is located again based on the corrected air volume of the independent loop where the remaining branch is located;

if the corrected value of the loop does not meet the preset precision range and the iteration times are greater than the preset threshold value, determining the weight of each branch according to the corrected air volume of the independent loop where the rest branches are located, and reordering;

and if the corrected value of the loop meets the preset condition, determining the final result of the air volume of each loop according to the corrected value of the loop.

Optionally, the loop air volume correction formula in the Scott-Hisley algorithm is as follows:

wherein R is_i，Q_iThe wind resistance and the wind quantity of each branch in the independent loop where each remaining branch is located;

the wind pressure of each branch in an independent loop where each remaining branch is located or the algebraic sum of the wind resistance is obtained, the wind pressure of the branch is a positive value when the wind direction of the branch is the same as that of the remaining branches, and otherwise, the wind pressure of the branch is a negative value; sigma | R_iQ_iL is the sum of absolute values of products of air volume and wind resistance of each branch in an independent loop where each remaining branch is located; h_{Tong (Chinese character of 'tong')}The wind pressure of a ventilator in the independent loop where each remaining branch is located is acted, the direction of the wind flow acted by the ventilator and the direction of the remaining branches take a negative value when being in the same direction, and otherwise, the direction is a positive value; h_FromThe natural wind pressure of the independent loop where the rest branches are located is the wind flow direction acted by the natural wind pressure, and the direction of the wind flow is a negative value when the natural wind pressure is in the same direction with the rest branches, otherwise, the natural wind pressure is a positive value.

Optionally, in the method for simplifying based on a wind resistance value, before the local wind network meeting the preset condition is simplified into a branch in the original ventilation network diagram to obtain the first ventilation network diagram, the method further includes:

determining whether each branch in the original ventilation network diagram meets a judgment condition of a series relation and/or a judgment condition of a parallel relation;

if the judgment condition of the series connection relation is met, combining two or more branches in series into one branch, determining that the air volume of the combined branch is the same as the air volume of any branch of the two or more branches in series, wherein the wind resistance of the combined branch is the sum of the wind resistances of the two or more branches in series, and the wind pressure of the combined branch is the sum of the wind pressures of the two or more branches in series;

if the judgment condition of the parallel connection relation is met, combining two or more branches which are connected in parallel into one branch, determining the air volume of the combined branch to be the sum of the air volumes of the two or more branches which are connected in parallel, wherein the inverse value of the wind resistance of the combined branch is the sum of the inverse values of the wind resistance of the two or more branches which are connected in parallel, and the wind pressure of the combined branch is the same as that of any branch of the two or more branches which are connected in parallel;

taking the original ventilation network graph after the merging and branching as the input of a wind resistance value simplifying method;

the judgment condition of the series connection relation is that two or more branches exist in the original ventilation network graph, and the end of each branch is connected with a common node, and the common node does not exist on other branches; the judgment condition of the parallel relation is that two or more branches in the original ventilation network graph have a common node, and the common node is two end points of the branches.

In a second aspect, the present invention provides an electronic device for mine ventilation network calculation, comprising a memory, a transceiver, and a processor, wherein:

a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and carrying out the steps of the method of mine ventilation network solution as described above in relation to the first aspect.

In a third aspect, the present invention provides a mine ventilation network solver, the apparatus comprising:

the simplifying module is used for simplifying a local wind network meeting preset conditions into a branch in an original ventilation network diagram based on a wind resistance value simplifying method to obtain a first ventilation network diagram;

a determining module, configured to determine a minimum tree and remaining branches with an exit well or an entry well as a root node based on the first ventilation network map;

the calculation module is used for determining a calculation result of the original ventilation network diagram based on the depth of the residual branches and a correction algorithm;

In a fourth aspect, the present invention provides a processor readable storage medium having stored thereon a computer program for causing a processor to perform the steps of the method of mine ventilation network solution as described above in relation to the first aspect.

According to the method and the device for calculating the mine ventilation network, the complex mine ventilation network diagram is simplified through a wind resistance value simplification method, the minimum tree and the residual branches are generated based on the simplified ventilation network diagram, and the calculation result of each branch in the original ventilation network diagram is determined according to the depth of the residual branches and a correction algorithm. The method can improve the resolving speed, and simultaneously adopts a more reasonable iterative calculation initial value assigning mode, thereby improving the resolving stability and the resolving efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic flow diagram of a method of mine ventilation network solution provided by the present invention;

FIG. 2 is a schematic view of the actual mine ventilation roadway provided by the present invention;

FIG. 3 is a schematic diagram of a mine ventilation network provided by the present invention;

FIG. 4 is a schematic illustration of a ventilation network diagram provided by the present invention with a partial wind network simplified;

FIG. 5 is a simplified schematic illustration of a portion of the wind network of the ventilation network provided by the present invention;

FIG. 6 is a schematic view of the ventilation network provided by the present invention before merging of the series branches;

FIG. 7 is a schematic illustration of a ventilation network diagram provided by the present invention after merging of the series branches;

FIG. 8 is a schematic view of a ventilation network diagram provided by the present invention before merging of the parallel branches;

FIG. 9 is a schematic view of a ventilation network diagram provided by the present invention after merging of the parallel branches;

FIG. 10 is an overall flow chart of a method of mine ventilation network solution provided by the present invention;

FIG. 11 is a schematic structural view of the electronic device of the mine ventilation network solution provided by the present invention;

fig. 12 is a schematic structural diagram of a mine ventilation network solver provided by the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The method and apparatus for mine ventilation network solution provided by the present invention will be described with reference to fig. 1-12.

Fig. 1 is a schematic flow chart of a method of mine ventilation network solution provided by the present invention, as shown in fig. 1, the method comprising:

step 101, simplifying a local wind network meeting preset conditions into a branch in an original ventilation network diagram based on a wind resistance value simplification method to obtain a first ventilation network diagram;

step 102, determining a minimum tree and residual branches with an outlet well or an inlet well as a root node based on the first ventilation network diagram;

103, determining a calculation result of the original ventilation network diagram based on the depth of the residual branches and a correction algorithm;

Specifically, the actual mine ventilation roadway comprises a plurality of exit wells and an entrance well, wherein the exit well is a ground node corresponding to a branch from which wind flows out and is usually determined according to the wind direction; the ground node corresponding to the branch where the wind enters the mine from the ground node is the entry well, based on the situation of the actual mine ventilation roadway, as shown in fig. 2.

The situation schematic diagram of the actual mine ventilation roadway is simplified to a certain extent, the ventilation network diagram corresponding to the situation schematic diagram is not in proportion and does not reflect the spatial relationship, as shown in fig. 3, the ventilation network diagram of the mine can clearly reflect the direction and the dividing and combining relationship of the wind flow, so that the ventilation network calculation and the ventilation system analysis are convenient to carry out, and the ventilation network diagram is one of important diagrams for mine ventilation management.

The shape of the ventilation network diagram can vary. In order to express the connection relation among all the roadways in the ventilation system and the ventilation characteristics of the roadways, the nodes of the ventilation network diagram can be shifted, and the branches can be stretched out and drawn back in a curved and straight manner. Generally, it is customary to draw the overall shape of the ventilation network diagram as an "oval".

Drawing a mine ventilation network diagram can be generally carried out according to the following steps:

1. and node numbering: on the mine ventilation system diagram, the junction points of the roadway air flows are numbered along the air flow direction. The numbering sequence is usually from small to large in the direction of the wind flow, and may be systematic or wing-wise. The node numbers cannot be repeated and continuity is to be maintained.

2. And (3) branch connecting line: nodes with windy flow communication are connected by a single line.

3. And (3) pattern arrangement: the shape of the ventilation network diagram is not unique. On the premise of correctly reflecting the wind flow separation and combination relation, the graph is drawn to be concise, clear and beautiful.

4. Labeling: in addition to the wind direction and wind quantity of each branch, the wind inlet and outlet, wind utilization, main wind leakage, and main ventilation facilities should be labeled and illustrated by the drawings.

The mine ventilation network diagram comprises branches, nodes, connection relations among the nodes of the branches, wind resistance of the branches and the like, wherein the branches refer to directional line segments representing a section of ventilation roadway, the direction of the line segments represents the direction of roadway wind flow, the branches comprise common branches and fan branches, the fan branches generally refer to that fans are installed on the common branches in order to increase local ventilation volume, and the branches are called fan branches in order to distinguish.

A node is an intersection of two or more branches. Each node has a unique number, called the node number, and each branch is connected to two nodes. The nodes may be located above ground or below ground, where the nodes above ground may be one or more exit wells or one or more entry wells. The wind resistance of the branches is known in the ventilation network diagram.

The ventilation network diagram is simplified according to the wind resistance value, whether a preset multiple that the wind resistance of each branch in a local wind network is smaller than the mean value of the wind resistances of other branches exists in an original ventilation network diagram needs to be determined, the influence of the wind resistance of the local wind network on the whole ventilation network is very small, the preset multiple is usually 10 times or more than 10 times, and a small multiple value can be obtained and needs to be set according to actual conditions. In addition, it is also necessary to determine that there are only two connection points between the local wind grid and other branches, that is, the preset condition is satisfied: in an original ventilation network diagram, the wind resistance of each branch in a local wind network is smaller than a preset multiple of the mean value of the wind resistance of other branches, and the number of connection points of the branch obtained by simplifying the local wind network and other branches is only two, so that the local wind network can be simplified into one branch, specifically as shown in fig. 4, the branch in a dotted frame in fig. 4 represents the local wind network meeting a preset condition, and the branch can be simplified into one branch by a wind resistance value simplification method, as shown in fig. 5.

Through the wind resistance value simplifying method, the original ventilation network diagram is simplified to obtain the first ventilation network diagram.

Then, based on the first ventilation network diagram, the minimum tree with the exit well or the entrance well as the root node is determined, and branches which are not on the minimum tree are the rest branches.

Finally, the depth of each residual branch refers to the number of nodes in the shortest path between two nodes of the residual branch and the root node on the generated minimum tree. And determining the air volume and the air pressure of each branch in the original ventilation network diagram based on the depth of the residual branches and a correction algorithm.

According to the method for calculating the mine ventilation network, the complex mine ventilation network diagram is simplified through a wind resistance value simplification method, the minimum tree and the residual branches are generated based on the simplified ventilation network diagram, and the calculation result of each branch in the original ventilation network diagram is determined according to the depth of the residual branches and a correction algorithm. The method can improve the resolving speed, and simultaneously adopts a more reasonable iterative calculation initial value assigning mode, thereby improving the resolving stability and the resolving efficiency.

Specifically, as shown in fig. 4, the branch with the largest wind resistance value in the local wind grid is the branch connecting node 5 and node 6, the corresponding wind resistance value is 0.6, and the direction of the branch, i.e., the wind direction, is the direction in which node 5 flows to node 6. As shown in fig. 5, after the local wind network is simplified into one branch, the wind resistance value of the branch with the largest wind resistance value in the local wind network is the wind resistance value of the branch with the largest wind resistance value in the local wind network, that is, the simplified branch is the branch connected with the node 1 and the node 9, the wind resistance value of the branch with the largest wind resistance value in the local wind network (the branch connected with the node 5 and the node 6) is 0.6, and the direction of the branch connected with the node 1 and the node 9 is that the node 1 flows to the node 9.

Specifically, the weight of each branch is determined under the condition that the wind resistance of each branch is known by a first ventilation network diagram obtained after simplification; under the condition that the branched air quantity is known, the branched weight is determined by the product of the branched air quantity Q and the branched wind resistance R; under the condition that the air quantity of the branches is unknown, the weights of the branches are wind resistance R of the branches, then the weights of all the branches in the first ventilation network graph are sequenced according to the weights of all the branches, the goal of minimizing the sum of the weights of all the branches is to determine the minimum tree of the first ventilation network graph, the determined minimum tree can be various, the determination standard of the minimum tree further comprises that the root node is an exit well or an entrance well, and the rest branches which are not positioned on the minimum tree are the rest branches of the ventilation network graph.

Optionally, determining a calculation result of the original ventilation network map based on the depths of the remaining branches and a correction algorithm includes:

Specifically, the invention provides a more reasonable method for assigning initial values to the residual branches according to the depths of the residual branches, namely assigning initial values to the residual branches according to the depths of the nodes connected with the residual branches. The method requires the precondition that the root node of the minimum tree is the ground node of the corresponding branch of the exit well or the entrance well. When the outlet wells or the inlet wells are multiple, virtual nodes are arranged on the ground and used for communicating the outlet wells or the inlet wells, and the virtual nodes are used as root nodes. So as to ensure that the air quantity flowing through the node is the total ventilation quantity of the mine. Let A, B be the nodes on the minimum tree connected to some residual branch l, and m and n be the depth, wherein x is the number of nodes on the minimum tree with the same depth as node A, and y is the number of nodes on the minimum tree with the same depth as node B. Knowing that the total ventilation air volume is Q (i.e. all air volume entering the mine), the initial air volume of the remaining branches is set as:

the initial value is the initial value of the rest branches l during iterative calculation.

And then, based on a Scott-Hisley algorithm, correcting the loop air volume of each residual branch until the loop air volume meets a preset precision range, and determining the original ventilation network calculation result on the basis of the final result of the loop air volume.

According to the method for calculating the mine ventilation network, the complex mine ventilation network diagram is simplified through a wind resistance value simplification method, the minimum tree and the residual branches are generated based on the simplified ventilation network diagram, and the calculation results of all branches in the original ventilation network diagram are determined according to the depths of the residual branches, the correction algorithm and the like. The method can improve the resolving speed, and simultaneously adopts a more reasonable iterative calculation initial value assigning mode, thereby improving the resolving stability and the resolving efficiency.

Specifically, when the wind flows in the ventilation network, the wind flow obeys the law of air volume balance, the law of air pressure balance and the law of resistance. The three main ventilation parameters in the ventilation network, the interrelation among the air volume, the air pressure and the air resistance are reflected, and the method is the theoretical basis for the complex ventilation network calculation.

Wherein, the normal wind flow in the roadway is generally turbulent. Thus, the branches of the ventilation network obey the law of turbulent ventilation resistance, i.e., h-R Q²。

If a branch of natural wind pressure exists in the first ventilation network diagram, initializing a wind pressure value of the branch of natural wind pressure according to a wind pressure balance law;

the law of balance of air flow means that the algebraic sum of the air flows into and out of a node or each branch of a closed circuit in a ventilation network is equal to zero, i.e. the air flow is balanced in such a way that

∑Q_i＝0

Assuming that the inflow air volume takes a positive value, the outflow air volume takes a negative value, and similarly, the inflow air volume takes a negative value, and the outflow air volume takes a positive value.

If the branches of the fans exist in the first ventilation network diagram, fitting a fan characteristic curve based on the initial air volume and initializing the air pressure values of the branches of the fans based on the wind pressure balance law;

the law of wind pressure balance refers to the algebraic sum of the wind pressures (or resistances) of the branches in any closed circuit of the ventilation network being equal to zero, i.e. the wind pressure balance law

∑h_i＝0

Assuming that the branch wind pressure flowing clockwise in the loop takes a positive value, the branch wind pressure flowing counterclockwise takes a negative value. The loop is a closed circuit formed by connecting two or more branches end to end, and is called as a loop.

And substituting the values into a loop air quantity correction formula of the Scott-Hisley method:

in the formula (I), the compound is shown in the specification,

the algebraic sum of the wind pressure or the wind resistance of each branch in the independent loop where each remaining branch is located. When the branch wind direction is in the same direction with the rest branches, the wind pressure takes a positive value, otherwise, the wind pressure is a negative value; sigma | R_iQ_iL is the sum of absolute values of products of air volume and wind resistance of each branch in an independent loop where each remaining branch is located; h_{Tong (Chinese character of 'tong')}Is the wind pressure of a ventilator in an independent loop in which the remaining branches are located, whichThe direction of the acting wind flow takes a negative value when being in the same direction with the rest branches, and otherwise, the direction is a positive value; h_FromThe natural wind pressure of the independent loop where the rest branches are located is the wind flow direction acted by the natural wind pressure, and the direction of the wind flow is a negative value when the natural wind pressure is in the same direction with the rest branches, otherwise, the natural wind pressure is a positive value.

After each iterative computation, judging whether the corrected value of the air volume of each loop meets the set precision range, and if so, ending the iterative computation; if not, judging whether the iteration times reaches or is larger than a preset threshold value, wherein the preset threshold value is a certain value set in advance and can be dynamically set according to the actual application condition. If the iteration times are smaller than a preset threshold value, after the delta Q value is used for correcting the air volume of each branch, the delta Q value is substituted into a loop air volume correction formula of the Scott-Hisley algorithm again to continuously correct the air volume; if the iteration times reach or are larger than a preset threshold value, calculating the weight of each branch according to the air volume of each newly obtained branch (the weight of each branch is the product of the air volume Q and the air resistance R), regenerating a minimum tree according to the new weight, determining the depth of the rest branches according to the newly generated minimum tree, and assigning an initial value. The above processes are circulated until the requirement of iterative precision is met, the final result of the air volume of each loop is determined, and the air volume of the independent loop is the component of the remaining branches of the independent loop; and the air volume of other branches on the minimum tree is the algebraic sum of the air volume of each independent loop where the branch is located, wherein when the air direction of other branches on the minimum tree is consistent with the direction of the independent loop, the value of the air volume of the branch is positive, and otherwise, the value of the air volume of the branch is negative.

And determining a resolving result of the original ventilation network diagram according to the steps.

In the present invention, the loops formed by the remaining branches are all loops formed by one branch of the minimum tree and the remaining branches of the ventilation network diagram, and are also referred to as independent loops.

Specifically, before the first ventilation network diagram is obtained, it can be further determined whether the original ventilation network diagram has a structure of serial and/or parallel branches. And executing the serial and/or parallel branches in the combined ventilation network to simplify a ventilation network diagram and simplify an iterative calculation process of the ventilation network after judging that the serial relation is satisfied and/or the parallel relation is satisfied.

The original ventilation network diagram series branch simplification method specifically comprises the following steps:

firstly, judging whether the original ventilation network diagram has branches meeting the series relation, wherein the judgment conditions are as follows: there are two or more branches in the original ventilation network graph with a common node end-to-end, and the common node is not present on other branches.

If the judgment condition meeting the series connection relation exists, combining two or more branches connected in series into one branch, determining that the air volume of the combined branch is the same as the air volume of any branch of the two or more branches connected in series, wherein the wind resistance of the combined branch is the sum of the wind resistances of the two or more branches connected in series, and the wind pressure of the combined branch is the sum of the wind pressures of the two or more branches connected in series;

as shown in fig. 6, branch 1 and branch 2 satisfy the series relationship. The two branches are connected end to end through a node 2, and the node 2 is a common node; and this node 2 is on and only on these two branches (branch 1 and branch 2).

At this point, branch 1 and branch 2 may be merged, resulting in branch 3, as shown in FIG. 7. The branch 3 satisfies, the air quantity Q of the branch 3₃With the original branch air volume (air volume Q of branch 1)₁Or air quantity Q of branch 2₂) Same, wind resistance R of branch 3₃For the wind resistance of the original branch (wind resistance R of branch 1)₁And wind resistance R of branch 2₂) Sum, wind pressure H of Branch 3₃For the original branch wind pressure (wind pressure H of branch 1)₁And wind pressure H of branch 2₂) And (3) the sum:

Q₃＝Q₁＝Q₂

R₃＝R₁+R₂

H₃＝H₁+H₂

in addition, the branch of establishing ties may have 3 or more, and when the branch of establishing ties has 3 or more than 3, two or more branches end to end each other together, and there is not the branch connection in the middle on public node, the amount of wind of branch after the combination, the wind pressure, the windage is:

1) the total wind quantity of the branches after the serial combination is equal to the wind quantity of each segment of the wind path, namely

Q_String＝Q₁＝Q₂＝…＝Q_n；

2) The total wind pressure of the branches after the serial combination is equal to the sum of the wind pressures of the wind paths of all the sections, namely

3) The total wind resistance of the branches after the serial combination is equal to the sum of the branch wind resistances of each section of wind path, namely

The method for simplifying the parallel branches of the original ventilation network diagram specifically comprises the following steps:

firstly, judging whether the original ventilation network diagram has branches meeting the parallel connection relation, wherein the judgment conditions are as follows: two or more branches in the original ventilation network graph have a common node, and the common node is two end points of the branches.

As shown in fig. 8, branch 4 and branch 5 satisfy a parallel relationship. The judgment conditions are as follows: (1) the branch(s) have a total of two nodes, here

nodes

4 and 6, (2) and these two nodes are the end points of this branch. At this point, branch 4 and branch 5 may be merged, resulting in branch 6 connecting node 4 and node 6, as shown in FIG. 9. The relevant parameters of branch 6 satisfy: air quantity Q of branch 6₆The wind resistance R of the branch 6 is the sum of the wind quantity of the original branch₆The branch wind resistance R is fully merged with the original branch₆The opening inverse value of the branch is the sum of the opening inverse values of the wind resistance of the original branch and the wind pressure H of the branch 6₆The wind pressure of each branch is the same as that of the original branch:

Q₆＝Q₄+Q₅

H₆＝H₄＝H₅

in addition, there may be 3 or more branches connected in parallel, when there are 3 or more branches connected in parallel, the relationship between the wind volume, wind pressure and wind resistance of the branch connected in parallel and the wind volume, wind pressure and wind resistance of the original branch can be expressed as:

1) the total air volume of the branches after parallel connection is equal to the sum of the air volumes of all the branches in parallel connection, namely

2) The total wind pressure of the branches after parallel connection is equal to the wind pressure of any branch in parallel connection, namely

h_{And are}＝h₁＝h₂＝…＝h_n

3) The reciprocal of the square root of the total wind resistance of the branches after parallel connection is equal to the sum of the reciprocal of the square root of the wind resistance of each branch after parallel connection, namely

According to the relation between the merged branch and the original branch, the wind volume, the wind resistance and the wind pressure of the merged branch can be obtained, and according to the information, after the calculation of the ventilation network is finished, the physical information such as the wind volume, the wind resistance and the wind pressure of each branch in each original ventilation network diagram is obtained.

Fig. 10 is an overall flowchart of a method for calculating a mine ventilation network provided by the present invention, and as shown in fig. 10, the overall flowchart specifically includes:

and in the data reading process, reading the mine ventilation calculation initial data by adopting a graphical interactive interface or a file import mode. The method comprises the steps of calculating branch wind resistance according to the data of each node, branch wind resistance (or branch length, friction resistance coefficient, sectional area and section perimeter), fixed air quantity branch number and air quantity value thereof, outlet air shaft number, inlet air shaft number and the like of the mine. Wherein, the fixed air volume branch is the air volume value of a known branch or branches before calculation. And calibrating the wind direction before calculation, wherein if the wind direction of each branch is the same as the calibration wind direction, the corresponding wind quantity, wind resistance and wind pressure take positive values, and if the wind direction of each branch is opposite to the calibration wind direction, the wind direction takes negative values.

And after data reading is finished, firstly, preliminarily simplifying and merging the series-parallel branches of the ventilation network according to a series-parallel branch simplification method, and reducing unknown quantities of a calculation equation set of the ventilation network.

And after the serial-parallel branches are simplified, simplifying the ventilation network diagram according to the wind resistance values to obtain a first ventilation network diagram, further reducing unknown quantities of a calculation equation set of the ventilation network, and improving the efficiency of the calculation process and the stability of iterative calculation.

And sequencing the branches according to the weight of each branch (the weight of each branch is the branch wind resistance R when the initial ventilation network is used for calculation, and the weight of each branch is the product of the branch wind quantity Q and the wind resistance R when the subsequent iterative calculation is sequenced).

And determining a minimum tree by taking the minimum sum of the weight values of all branches as a target, wherein the root node is an exit well or an entrance well on the premise of ensuring that all nodes exist on the tree according to the selection standard of the branches of the minimum tree. And the rest branches which are not positioned on the minimum tree are the rest branches calculated by the ventilation network.

Independent loops with the same number as the rest branches are formed according to a heuristic backtracking method, and the loop formed by the minimum tree and one rest branch in the rest branches in the ventilation network diagram is an independent loop.

And (3) assigning initial values to all the residual branches according to the method for assigning initial values to the residual branch air volume according to the residual branch depth, and calculating the air volume of each branch (the air volume of each branch is the sum of the air volumes of all the independent loops where each branch is located) according to the condition of the independent loop where each branch is located.

And initializing the natural wind pressure of the branch with the natural wind pressure, and fitting a fan characteristic curve according to the initial wind volume of the branch with the fan to obtain the additional wind pressure of the fan.

And iteratively calculating the corrected value of the air volume of the loop in which each remaining branch is positioned by utilizing a Scott-Hinsley algorithm, determining whether the corrected air volume meets the preset precision requirement, if so, determining the air volume of each branch according to the final corrected value, and determining the air volume and the air pressure of each branch in the original ventilation network diagram by combining a ventilation resistance law, an air volume balance law and an air pressure balance law. If the accuracy requirement is not met, it is determined whether the number of iterations reaches or exceeds a set value (shown as 20). If the iteration times are less than the set value, after the delta Q value is used for correcting the air volume of each branch, the delta Q value is substituted into the loop air volume correction formula of the Scott-Hisley method again to continuously correct the air volume; if the iteration times reach or are larger than the set value, calculating the weight (R multiplied by Q value in the present case) of each branch according to the latest obtained air volume, and regenerating the minimum tree and the rest branches according to the new weight. And (4) circulating the process until a final ventilation network calculation result is obtained.

FIG. 11 is a schematic structural view of the electronic device of the mine ventilation network solution provided by the present invention; as shown in fig. 11, the electronics of the mine ventilation network solution, including memory 1120, transceiver 1110, and processor 1100; the processor 1100 and the memory 1120 may also be disposed physically separately.

A memory 1120 for storing a computer program; a transceiver 1110 for transceiving data under the control of the processor 1100.

In particular, the transceiver 1110 is used to receive and transmit data under the control of the processor 1100.

Where in fig. 11, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1100, and various circuits, represented by memory 1120, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 1110 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like.

The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1100 in performing operations.

The processor 1100 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.

The processor 1100 is configured to execute any of the methods provided by the embodiments of the present invention by calling the computer program stored in the memory 1120 according to the obtained executable instructions, for example:

It should be noted that the electronic device for mine ventilation network calculation provided in the embodiment of the present invention can implement all the method steps implemented by the above method embodiment, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.

The mine ventilation network calculating device provided by the invention is described below, and the mine ventilation network calculating device described below and the mine ventilation network calculating method described above can be correspondingly referred to each other.

Fig. 12 is a schematic structural diagram of a mine ventilation network solver provided by the invention, and as shown in fig. 12, the device comprises:

a simplification module 1201, configured to simplify, in an original ventilation network diagram, a local wind network that meets a preset condition into one branch based on a wind resistance value simplification method, so as to obtain a first ventilation network diagram;

a determination module 1202 for determining a minimum tree and remaining branches having an exit well or an entry well as a root node based on the first ventilation network graph;

a calculation module 1203, configured to determine a calculation result of the original ventilation network map based on the depth of the remaining branches and a correction algorithm;

Optionally, the determining module 1202 is further configured to:

Optionally, the calculating module 1203 is further configured to:

wherein the content of the first and second substances,

Optionally, the simplifying module 1201 is further configured to:

It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

In another aspect, the invention also provides a computer program product comprising a computer program storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of performing the steps of the method of mine ventilation network solution provided by the above methods, for example comprising:

In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the steps of the method of mine ventilation network solution provided by the above methods, for example comprising:

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A method of mine ventilation network solution, comprising:

2. The mine ventilation network solution method of claim 1, wherein the wind resistance of the branch of the local wind network simplification is the wind resistance of the branch with the largest wind resistance value in the local wind network.

3. A method of mine ventilation network solution according to claim 1, wherein the determining a minimum tree and remaining branches rooted at an exit well or an entry well based on the first ventilation network graph comprises:

4. The method of mine ventilation network solution according to claim 1, wherein the determining the original ventilation network graph solution based on the depth of the remaining branches and a correction algorithm comprises:

5. The mine ventilation network solution method according to claim 4, wherein the step of correcting the loop air volume of each of the remaining branches based on the Scott-Hisley algorithm until the loop air volume meets a preset accuracy range, and the step of determining the final result of the loop air volume comprises:

6. The method for mine ventilation network solution according to claim 1, wherein the wind resistance value-based simplification method simplifies the local wind network satisfying the preset condition into one branch in the original ventilation network diagram, and before obtaining the first ventilation network diagram, the method further comprises:

7. An electronic device for mine ventilation network solution, comprising a processor and a memory having a computer program stored thereon, wherein the processor, when executing the computer program, performs the steps of the method for mine ventilation network solution of any one of claims 1 to 6.

8. A device for resolving a mine ventilation network, comprising:

9. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the method of mine ventilation network resolution of any of claims 1 to 6.