CN110439603B

CN110439603B - Air volume monitoring method and device of ventilation system

Info

Publication number: CN110439603B
Application number: CN201910780752.7A
Authority: CN
Inventors: 杨卓明; 李永生; 朱瑞军; 何煦春; 李少辉; 王磊; 吴昊燕
Original assignee: China ENFI Engineering Corp
Current assignee: China ENFI Engineering Corp
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2021-03-23
Anticipated expiration: 2039-08-22
Also published as: CN110439603A

Abstract

The disclosure relates to the technical field of mine ventilation, in particular to an air quantity monitoring method and device of a ventilation system. The air volume monitoring method comprises the following steps: acquiring a network diagram of the ventilation system according to the branch and node information of the ventilation system; obtaining a spanning tree of a ventilation system and a plurality of residual tree chords complementary to the spanning tree based on the network diagram, wherein the spanning tree comprises a plurality of branches; determining a relational expression between the air volume of each branch and the air volume of the rest tree chord; measuring the air quantity at the chord position of each residual tree; and substituting the air volume at the positions of the rest tree chords into the relational expression to obtain the air volume at each branch position. The air volume monitoring method is low in measurement cost, simple in measurement process, high in measurement efficiency and suitable for a ventilation network with higher complexity.

Description

Air volume monitoring method and device of ventilation system

Technical Field

The disclosure relates to the technical field of mine ventilation, in particular to an air quantity monitoring method and device of a ventilation system.

Background

In mine, the ventilation system is composed of tunnel ventilation network, ventilator for driving air flow and ventilation structure for controlling air flow, and is mainly used for conveying sufficient fresh air into tunnel, diluting and discharging toxic and harmful gas and dust in tunnel. In order to ensure that the ventilation system can run safely and stably for a long time, technical management personnel need to monitor the air quantity in a roadway in real time, so that a basis is provided for management and decision of the mine ventilation system.

At present, the air quantity of a ventilation system is measured by mainly utilizing air quantity measuring instruments such as an air meter to measure the air quantity of each tunnel one by one, although the measuring result can reflect the distribution condition of the whole air quantity, the measuring process is more complicated, the measuring efficiency is lower, and meanwhile, the air quantity measuring instruments are required to be arranged in each tunnel, so that the measuring cost is higher.

The above information disclosed in the background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute prior art that is known to a person of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide an air quantity monitoring method and device of a ventilation system.

In order to achieve the purpose, the technical scheme adopted by the disclosure is as follows:

according to an aspect of the present disclosure, there is provided an air volume monitoring method of a ventilation system, the air volume monitoring method including:

acquiring a network diagram of a ventilation system according to branch and node information of the ventilation system;

obtaining a spanning tree of the ventilation system and a plurality of residual tree chords complementary to the spanning tree based on the network map, wherein the spanning tree comprises a plurality of branches;

determining a relational expression between the air volume of each branch and the air volume of the rest tree chord;

measuring the air quantity at each residual tree chord;

and substituting the air volume at the positions of the rest tree chords into the relational expression to obtain the air volume at each branch position.

In an exemplary embodiment of the disclosure, determining a spanning tree of the network graph and a plurality of remainder tree chords complementary to the spanning tree includes:

selecting any one of the branches as a root branch;

modifying the end node of the root branch, and enabling the end node of the root branch to be the same as the initial node of the root branch;

sequentially modifying the other nodes except the initial node and the final node of the root branch in the spanning tree;

judging whether the starting node and the tail node of each branch except the root branch in the spanning tree are the same;

wherein if the starting node and the end node of the branch are the same, the branch is the cosine; and if the starting node and the last node of the branch are different, the branch is the branch.

In an exemplary embodiment of the present disclosure, determining a relationship between an air volume at each of the branches and an air volume at the remaining tree chord includes:

determining an independent loop corresponding to each residual tree string to generate an independent loop information table corresponding to the independent loop;

storing each of the independent loop information tables in a loop information database;

and determining a relational expression between the air volume of each branch and the air volume of the rest tree string based on the loop information database.

In an exemplary embodiment of the present disclosure, determining an independent loop corresponding to each remaining tree string to generate an independent loop information table corresponding to the independent loop includes:

adding any one of the rest tree chords into the spanning tree to form an initial independent loop diagram corresponding to the rest tree chord;

establishing an initial linearity information table of each node based on the initial independent loop diagram;

correcting the initial linearity information table to obtain a target linearity information table of each node; in the target linearity information table, the linearity of each node is not one;

and determining a target independent loop corresponding to each residual tree string according to the target linearity information table so as to generate the independent loop information table corresponding to the target independent loop.

In an exemplary embodiment of the present disclosure, modifying the initial linearity information table to obtain a target linearity information table of each node includes:

determining an independent branch in the initial independent loop diagram based on the initial linearity information table; wherein the node associated with the single-headed branch has a linearity of one;

removing the single-head branches from the initial independent loop diagram to form the target independent loop diagram corresponding to the residual tree strings;

and determining the target linearity information table of each node based on the target independent loop diagram.

In an exemplary embodiment of the present disclosure, in the independent loop information table, "0" indicates that the corresponding branch is not in the independent loop; "1" means that the corresponding branch is in the independent loop and in the same direction as the independent loop; "-1" indicates that the corresponding branch is in the independent loop and in the opposite direction to the independent loop.

According to another aspect of the present disclosure, there is provided an air volume monitoring device of a ventilation system, for implementing the air volume monitoring method of the ventilation system.

The air volume monitoring method and the air volume monitoring device of the ventilation system provided by the disclosure are characterized in that firstly, a network diagram of the ventilation system is obtained according to branch and node information of the ventilation system; then, a spanning tree of the ventilation system and a plurality of residual tree chords complementary to the spanning tree are obtained based on the network diagram, and the spanning tree comprises a plurality of branches; secondly, determining a relational expression between the air volume of each branch and the air volume of the rest tree chord; and finally, measuring the air volume at each rest tree chord position, substituting the air volume at each rest tree chord position into the relational expression, and further solving the air volume at each branch position. According to the air volume monitoring method of the ventilation system, the air volume at the branch position is determined based on the relational expression between the air volume at the branch position and the air volume at the residual tree chord position only by arranging the air meters at the residual tree chord position and after the air volume at the residual tree chord position is measured, on one hand, the air meters do not need to be arranged at the branch position, so that the measurement cost is reduced, on the other hand, the measurement process is simple, and the measurement efficiency is improved. Therefore, the air volume monitoring method is suitable for a ventilation network with higher complexity.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a flowchart of an air volume monitoring method of a ventilation system according to an embodiment of the present disclosure.

Fig. 2 is a flowchart of a method for determining a chord and a branch of a remaining tree according to an embodiment of the present disclosure.

Figure 3 is a network diagram of a ventilation system according to an embodiment of the present disclosure.

FIG. 4 is a schematic diagram of a spanning tree in accordance with an embodiment of the present disclosure.

FIG. 5 is a schematic diagram of another spanning tree according to an embodiment of the present disclosure.

FIG. 6 is a diagram of an initial independent loop corresponding to a remainder tree chord in accordance with an embodiment of the present disclosure.

Fig. 7 is a diagram of a target independent loop corresponding to a remainder tree chord in an embodiment of the disclosure.

Figure 8 is a network diagram of a coal mine ventilation system.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

The embodiment of the present disclosure provides an air volume monitoring method of a ventilation system, as shown in fig. 1, the air volume monitoring method may include the following steps:

step S110, acquiring a network diagram of the ventilation system according to the branch and node information of the ventilation system;

step S120, a spanning tree of the ventilation system and a plurality of rest tree chords complementary to the spanning tree are obtained based on the network diagram, and the spanning tree comprises a plurality of branches;

step S130, determining a relational expression between the air volume of each branch and the air volume of the rest tree chord;

step S140, measuring the air volume at the chord position of each residual tree;

and S150, substituting the air volume at each residual tree chord position into the relational expression to obtain the air volume at each branch position.

The air volume monitoring method of the ventilation system comprises the steps of firstly, acquiring a network diagram of the ventilation system according to branch and node information of the ventilation system; then, a spanning tree of the ventilation system and a plurality of residual tree chords complementary to the spanning tree are obtained based on the network diagram, and the spanning tree comprises a plurality of branches; secondly, determining a relational expression between the air volume of each branch and the air volume of the rest tree chord; and finally, measuring the air volume at each rest tree chord position, substituting the air volume at each rest tree chord position into the relational expression, and further solving the air volume at each branch position. According to the air volume monitoring method of the ventilation system, only the air meters are arranged at the positions of the remaining tree chords, after the air volume at the positions of the remaining tree chords is measured, the air volume at the positions of the branches is determined based on the relational expression between the air volume at the positions of the branches and the air volume at the positions of the remaining tree chords, on one hand, the air meters do not need to be arranged at the positions of the branches, the measurement cost is reduced, on the other hand, the measurement process is simple, the measurement efficiency is improved, and therefore the air volume monitoring method is suitable for a ventilation network with higher.

The following describes in detail an air volume monitoring method provided by an embodiment of the present disclosure with reference to the accompanying drawings:

in step S110, a network map of the ventilation system may be acquired according to the branch and node information of the ventilation system.

The mine ventilation system includes a plurality of branch roadways, each of which intersects to form a node, so that a branch and node information table can be generated according to the branch and node information of the ventilation system, as shown in table 1, and the ventilation system is simplified according to table 1 to obtain a network diagram of the ventilation system as shown in fig. 3.

TABLE 1

Branch of	1	2	3	4	5	6	7	8	9	10	11
												Starting node	6	1	1	1	1	2	2	3	3	4	5
End node	1	2	2	3	4	5	3	5	4	6	6

In step S120, a spanning tree of the ventilation system and a plurality of remaining tree chords complementary to the spanning tree can be obtained based on the network map, and the spanning tree includes a plurality of branches.

According to the definition of the spanning tree, the method has the following three characteristics: the method includes steps of (1) containing all nodes in a network graph; all nodes are communicated; and ③ no loop. According to the three characteristics, two nodes in the network graph have one and only one connection path in the spanning tree. If there are two or more paths, there must be a loop in the spanning tree, which is contradictory to the essential attributes of the spanning tree, so that any branch is taken out of the spanning tree and the spanning tree is divided into two completely independent parts.

Specifically, as shown in fig. 2, the method for determining the remaining tree strings and branches may include the following steps:

step S1201, selecting any one branch as a root branch;

step S1202, correcting the end node of the root branch, and enabling the end node of the root branch to be the same as the initial node of the root branch;

step S1203, sequentially correcting the rest nodes of the spanning tree;

step S1204, judge whether the starting node and end node of each other branch are the same;

wherein, if the starting node and the end node of the branch are the same, the branch is a residual tree chord; if the starting node and the end node of the branch are not the same, the branch is a branch.

For example, in the first step, branch 1 may be selected as the root branch in the network map; second, modify the end node of branch 1 and make the end node of branch 1 and the start node of the root branch the same, namely: v₁→V₆At this time, the end node and the start node of branch 2, branch 3, branch 4 and branch 5 are different, but no loop exists in the spanning tree, so that branch 2, branch 4 and branch 5 can be regarded as branches, and branch 3 can be regarded as a residual tree chord; thirdly, the V is mixed₂Corrected to V₆At this time, the end node and the start node of branch 6 and branch 7 are different, but no loop can exist in the spanning tree, so that branch 6 can be regarded as a branch and branch 7 can be regarded as a residual tree chord; the fourth step is to mix V₃Corrected to V₆At this time, the tail node and the start node of branch 8 and branch 9 are different, but no loop exists in the spanning tree, so that branch 8 and branch 9 are both residual tree chords; first, theFive steps, mixing V₄Corrected to V₆At this time, the end node and the start node of the branch 10 are the same, so the branch 10 is a remainder tree chord; the sixth step, V₅Corrected to V₆At this time, the end node and the start node of the branch 11 are the same, and therefore the branch 11 is a remainder tree chord. In summary, a spanning tree for the ventilation system as shown in FIG. 4 can be obtained.

It should be noted that the spanning tree is not unique, as long as the three features are satisfied, and therefore, the spanning tree of the ventilation system as shown in fig. 5 can be obtained, which will not be described in detail herein.

In step S130, a relational expression between the air volume at each branch and the air volume at the remaining tree chord is determined. Specifically, step S130 may include the steps of:

step S1301, determining an independent loop corresponding to each remaining tree string to generate an independent loop information table corresponding to the independent loop, wherein step S1301 may further include: (1) adding any one of the rest tree strings into the spanning tree to form an initial independent loop diagram corresponding to the rest tree string; (2) establishing an initial linearity information table of each node based on the initial independent loop diagram; (3) correcting the initial linearity information table to obtain a target linearity information table of each node; in the target linearity information table, the linearity of each node is not one; (4) determining an independent loop corresponding to each residual tree string according to the target linearity information table to generate an independent loop information table corresponding to the independent loop;

step S1302, storing each independent loop information table in a loop information database;

and step S1303, determining a relational expression between the air volume at each branch and the air volume at the rest tree chord based on the loop information database.

For step S1301, for example, first, an extra tree string 5 may be added to the spanning tree shown in fig. 5 to form an initial independent loop diagram corresponding to the extra tree string 5, as shown in fig. 6.

Secondly, an initial linearity information table of each node may be established based on the initial independent loop graph, as shown in table 1:

TABLE 2

Node point	V₁	V₂	V₃	V₄	V₅	V₆
							Degree of linearity	4	1	3	2	1	1

Then, the initial linearity information table is modified to obtain a target linearity information table of each node, which specifically includes the following steps:

firstly, determining the single-head branch in the initial independent loop diagram based on the initial linearity information table. The linearity of the node associated with the single-headed branch is one, that is, branch 1 (V)₆，V₁) Branch 8 (V)₃，V₅) Branch 2 (V)₁，V₂) Are all single-head branches;

and secondly, removing the branch 1, the branch 8 and the branch 2 from the initial independent loop diagram to form a target independent loop diagram corresponding to the residual tree chord, as shown in fig. 7.

And thirdly, determining a target linearity information table of each node based on the target independent loop diagram, as shown in table 2:

TABLE 3

Node point	V₁	V₂	V₃	V₄	V₅	V₆
							Degree of linearity	2	0	2	2	0	0

Referring to FIG. 7 and Table 2, the cosine 5 (V) of the tree is shown₁，V₄) The corresponding independent loop information table is shown in table 3:

TABLE 4

Branch of	1	2	3	4	5	6	7	8	9	10	11
												Independent loop corresponding to residual tree string 5	0	0	0	-1	1	0	0	0	-1	0	0

Where "0" indicates that the branch is not in the isolated loop, "1" indicates that the branch is in the isolated loop and is in the same direction as the isolated loop, and "-1" indicates that the branch is in the isolated loop but is in the opposite direction to the isolated loop.

For step S1302, independent loop information tables corresponding to other remaining tree strings can be obtained according to the above method, and each independent loop information table is stored in the loop information database, as shown in table 5:

TABLE 5

Branch of	1	2	3	4	5	6	7	8	9	10	11
												Independent loop corresponding to residual tree string 3	0	-1	1	0	0	0	0	0	0	0	0
Independent loop corresponding to residual tree string 5	0	0	0	-1	1	0	0	0	-1	0	0
												Independent loop corresponding to residual tree string 6	0	1	0	-1	0	1	0	-1	0	0	0
Independent loop corresponding to residual tree string 7	0	1	0	-1	0	0	1	0	0	0	0
												Independent loop corresponding to residual tree string 10	1	0	0	1	0	0	0	0	1	1	0
Independent loop corresponding to residual tree string 11	1	0	0	1	0	0	0	1	0	0	1

In step S1303, as can be seen from table 5, the direction of branch 1 in the independent circuit is the same as that of extra tree strings 10 and 11, and the airflow of branch 1 is divided into two parts (extra tree strings 10 and extra tree strings 11) after flowing into the circuit, that is, the relationship between the airflow of branch 1 and the airflow of extra tree strings 10 and 11 is: wind power₁Wind-cold syndrome₁₀+ wind₁₁。

Of course, according to the loop information database, the relational expression between the air volume at other branches and the air volume at the remaining tree chords can be determined, and details are not repeated here.

In step S140, the air volume at each of the remaining tree chords is measured. Specifically, air quantity measuring instruments such as air meters and the like can be arranged in the roadway at the position of the excess tree chord of the mine, so that the air quantity at each excess tree chord can be measured, and the detailed description is omitted.

In step S150, the air volume at each of the remaining tree chords is substituted into the relational expression to obtain the air volume at each of the branches, which is not described herein again.

Therefore, by adopting the air volume monitoring method of the ventilation system provided by the invention, for the ventilation network with m nodes and n branches, only n-m +1 times (the number of the rest tree strings) of measurement is needed, which is equivalent to reducing m-1 times of measurement and greatly improving the monitoring efficiency. Therefore, the air volume monitoring method is suitable for a ventilation network with higher complexity.

The air volume monitoring method provided by the embodiment of the disclosure is verified by combining a coal mine ventilation system as follows:

fig. 8 is a network diagram of the coal mine ventilation system including multiple roadways such as a subline, a shaft yard, a north-auxiliary roadway, a 5103 air intake roadway, and the like, which are detailed in tables 6 and 7, and are not described one by one.

According to the air volume detection method, branches and extra tree chords of the network diagram of the coal mine ventilation system can be obtained, specifically, branches corresponding to the starting node and the last node in the table 6 are the extra tree chords, and branches corresponding to the starting node and the last node in the table 7 are the branches.

Firstly, the wind meter can be used for measuring the wind quantity at the chord position of the rest tree, and the actually measured wind quantity is shown in a table 6; and calculating the air volume at the branch position by adopting the air volume monitoring method of the ventilation system, meanwhile, arranging an air meter at the branch position, correspondingly obtaining the actually measured air volume, and calculating the air volume and the actually measured air volume as shown in a table 7.

The calculated air volume and the actually measured air volume at the branch of the tree are compared, and the relative error of the calculated air volume and the actually measured air volume is within 5%, so that the air volume monitoring method of the ventilation system is proved to be reliable and effective, the measurement workload is obviously reduced, and the working efficiency is improved.

TABLE 6

TABLE 7

The embodiment of the disclosure also provides an air volume monitoring device, which is used for realizing the air volume monitoring method of the ventilation system.

For example, the air volume monitoring device may include an air meter, a computer, and a connection line connecting the air meter and the computer, and may also include other auxiliary devices, which are not described in detail herein.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. An air volume monitoring method of a ventilation system is characterized by comprising the following steps:

determining a relational expression between the air volume at each branch and the air volume at the rest tree chord, comprising: determining an independent loop corresponding to each residual tree string to generate an independent loop information table corresponding to the independent loop; storing each of the independent loop information tables in a loop information database; determining a relational expression between the air volume of each branch and the air volume of the rest tree chord based on the loop information database;

measuring the air quantity at each residual tree chord;

substituting the air volume at each residual tree chord position into the relational expression to obtain the air volume at each branch position;

determining an independent loop corresponding to each remaining tree string to generate an independent loop information table corresponding to the independent loop, wherein the method comprises the following steps:

2. The method of monitoring air volume according to claim 1, wherein obtaining a spanning tree of the ventilation system and a plurality of remaining tree chords complementary to the spanning tree based on the network map comprises:

selecting any one of the branches as a root branch;

3. The air volume monitoring method according to claim 1, wherein the step of correcting the initial linearity information table to obtain a target linearity information table of each node comprises:

4. The air volume monitoring method according to claim 1, wherein in the independent circuit information table, "0" indicates that the corresponding branch is not in the independent circuit; "1" means that the corresponding branch is in the independent loop and in the same direction as the independent loop; "-1" indicates that the corresponding branch is in the independent loop and in the opposite direction to the independent loop.

5. An air volume monitoring device of a ventilation system, characterized by being used for realizing the air volume monitoring method of the ventilation system according to any one of claims 1 to 4.