CN113159585A - High-altitude mine ventilator efficiency evaluation method based on hierarchical model - Google Patents

High-altitude mine ventilator efficiency evaluation method based on hierarchical model Download PDF

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CN113159585A
CN113159585A CN202110449198.1A CN202110449198A CN113159585A CN 113159585 A CN113159585 A CN 113159585A CN 202110449198 A CN202110449198 A CN 202110449198A CN 113159585 A CN113159585 A CN 113159585A
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黄玉诚
王瑜敏
郝宇鑫
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China University of Mining and Technology Beijing CUMTB
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Abstract

The invention discloses a high-altitude mine ventilator efficiency evaluation method based on a hierarchical model, which comprises the following steps: analyzing the influence and influence rule of the high-altitude environment characteristics on the high-altitude mine ventilator efficiency, selecting key influence factors, and establishing an evaluation index system; determining the weight of each index by combining key influence factor analysis and an analytic hierarchy process; determining a scoring rule of each index by using a fuzzy comprehensive evaluation method according to the influence rule of each index on the efficiency of the high-altitude mine ventilator, scoring each index and performing weighted calculation to obtain a final evaluation score; and establishing a proper ventilation efficiency level grade division table, and comparing the final obtained result obtained by calculation with the final obtained result to obtain the efficiency level grade of the high-altitude mine ventilator. The method for evaluating the efficiency of the high-altitude mine ventilator is constructed, is beneficial to scientifically evaluating the efficiency level of the high-altitude mine ventilator, guides the high-altitude mine to correctly know the current ventilation situation and the existing problems, guides the high-altitude mine to adopt a proper method to ensure the ventilation quality, and has important theoretical significance and practical value.

Description

High-altitude mine ventilator efficiency evaluation method based on hierarchical model
Technical Field
The invention relates to the field of ventilation safety of high-altitude mines, in particular to a method for evaluating the efficiency of a high-altitude mine ventilator based on a hierarchical model.
Background
Along with the long-term development of mine resources in the eastern area of China, the resource reserves are less and less, the rapid development of the social economy and the acceleration of the modernization process of China rapidly increase the demand of mineral resources, and the imbalance of the supply-demand ratio of the mineral resources causes serious restriction on the rapid development of the social economy of China. Therefore, with the implementation of the western development strategy in China, the western regions which are rich in resources, wide in regions and have a certain economic and technical level will certainly occupy more and more important positions in future national economic development.
However, most of western China is high-altitude areas, land area with elevation above 1000m accounts for about 60% of land area in China, land area with elevation above 2000m accounts for about 33%, land area with elevation above 3000m accounts for about 26%, and the land area with elevation above 3000m has the characteristics of high altitude, wide area and large span. The atmospheric pressure in the high-altitude area is low, the air density is low, and the atmospheric pressure and the air density are gradually reduced along with the altitude.
The ventilator is an important ventilation device for mine production, in the actual production of a high-altitude mine, no matter the main ventilator or the local ventilator has obvious effect reduction, particularly, the difference between the wind pressure of the ventilator and the wind pressure of a factory sample of the ventilator is large, so that the ventilation difficulty of the high-altitude mine is increased, great challenges are brought to mine ventilation, the ventilation efficiency of the high-altitude mine ventilator is improved, and the ventilator is an important problem in the safety and efficient production of the high-altitude mine.
At present, mine fans are designed and manufactured on the basis of environmental parameters of standard regions, fan performance curves provided by fan manufacturing enterprises are drawn by model test data under standard meteorological conditions, and when the fans are applied to high-altitude mines, the efficiency of the fans is reduced due to low air pressure and low air density.
In order to scientifically measure the efficiency level of the high-altitude mine ventilator, the invention comprehensively considers a plurality of index factors of the ventilator efficiency under the high-altitude condition, selects a proper fan efficiency evaluation index, establishes an evaluation index system with the characteristics of a high-altitude area, and selects a proper evaluation method according to the established evaluation index system to comprehensively evaluate the efficiency level of the high-altitude mine ventilator.
Disclosure of Invention
The method for evaluating the efficiency of the high-altitude mine ventilator based on the hierarchical model comprises the following steps:
the method comprises the following steps: analyzing the influence of the characteristics of the high-altitude environment on the efficiency of the high-altitude mine ventilator, screening out important influencing factors, extracting evaluation indexes, carrying out hierarchical classification on all the index factors, and establishing an evaluation index system.
Step two: and determining the weighted value of each index by an analytic hierarchy process according to the relative importance of each index by combining the influence rule of each pair of high-altitude mine ventilator efficiencies.
Step three: and (4) scoring each index by using a fuzzy comprehensive evaluation method, and obtaining a final evaluation score through weighting calculation.
Step four: and establishing proper high-altitude mine ventilator efficiency level grades to divide the intervals, and comparing the final evaluation score obtained by calculation with the interval to obtain the high-altitude mine ventilator efficiency level grade.
The method for evaluating the efficiency of the high-altitude mine ventilator is constructed, is beneficial to scientifically evaluating the efficiency level of the high-altitude mine ventilator, guides the high-altitude mine to correctly know the current ventilation situation and the existing problems, guides the high-altitude mine to adopt a proper method to ensure the ventilation quality, and has important theoretical significance and practical value.
Further, in the step one:
the ventilator efficiency level mainly comprises three aspects of a fan, a motor and economic benefits.
The key indexes of the fan comprise equivalent air volume, air pressure, fan output power and fan efficiency.
Key indicators for the motor include motor output power, motor efficiency, and insulation strength.
Key indicators of economic benefit include fan energy consumption and fan investment.
Furthermore, in the second step, the relative importance of each index is determined by expert scoring, a judgment matrix is established and consistency is checked, and the relative weight of elements under a single criterion is calculated, so that the weight value of each index can be obtained.
And further, in the third step, the indexes are scored by using a fuzzy comprehensive evaluation method according to the altitude condition and the air density condition of the high-altitude mine.
Further, the level of the efficiency level of the high-altitude mine ventilator in the step four is graded as follows:
excellence (score S is more than or equal to 90 and less than or equal to 100), excellence (score S is more than or equal to 80 and less than 90), general (score S is more than or equal to 70 and less than 80), worse (score S is more than or equal to 60 and less than 70) and worse (score S is less than 60).
And further, performing weighted calculation on the fan performance index score obtained in the third step according to the index weight obtained in the second step to obtain a final evaluation score, and dividing intervals according to the high-altitude mine fan efficiency level grade obtained in the fourth step to obtain the high-altitude mine fan efficiency level grade.
Drawings
FIG. 1 is a hierarchical model of high altitude mine ventilator performance evaluation in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention.
As shown in fig. 1, the method for evaluating the efficiency of a high-altitude mine ventilator based on a hierarchical model comprises the following steps:
the method comprises the following steps: analyzing the influence of the characteristics of the high-altitude environment on the efficiency of the high-altitude mine ventilator, screening out important influencing factors, extracting evaluation indexes, carrying out hierarchical classification on all the index factors, and establishing an evaluation index system.
Step two: and determining the weighted value of each index by an analytic hierarchy process according to the relative importance of each index by combining the influence rule of each pair of high-altitude mine ventilator efficiencies.
Step three: and determining the scoring rule of each index by combining the influence rule of each index on the efficiency of the high-altitude mine ventilator, scoring each index and performing weighted calculation to obtain a final evaluation score.
Step four: and establishing a proper high-altitude mine ventilator efficiency level division table, and comparing the final evaluation score obtained by calculation with the table to obtain the high-altitude mine ventilator efficiency level.
The specific implementation method of the first step is as follows:
the high-altitude mine ventilator has the efficiency level mainly comprising three aspects of a fan, a motor and economic benefits.
(1) When the fan is applied to a high-altitude low-pressure region, the corresponding volume air quantity and the fan efficiency are the same as those of a plain region along with the reduction of the air density, and the equivalent air quantity, the air pressure and the power are reduced in an equal ratio along with the reduction of the air density. Therefore, the key indicators of the fan include equivalent air volume, air pressure, fan output power and fan efficiency.
(2) When the fan runs in a high-altitude mine, the equipped motor can have serious efficiency reduction, and the effects of reducing output power, reducing efficiency, increasing temperature rise and the like are mainly reflected. Thus, key indicators for the motor include motor output power, motor efficiency, and insulation strength.
(3) Key indicators of economic benefit include fan energy consumption and fan investment.
And establishing a hierarchical index system for evaluating the efficiency level of the high-altitude mine ventilator according to the key indexes obtained by analyzing and extracting.
The concrete implementation method of the second step is as follows:
(1) and constructing a judgment matrix. Suppose C has a subordinate index C1，c2，…，cn. In the process of forming the judgment matrix, aiming at C, referring to the scale basis of the table 1, inviting experts in the digital related field to judge two indexes CiAnd cjAnd assigning a corresponding score. The obtained relative importance of each index is listed in a matrix, and a judgment matrix for pairwise comparison of each evaluation index can be obtained
Figure BDA0003038113250000051
TABLE 1 Scale basis and score values
Figure BDA0003038113250000052
(2) And checking the consistency of the judgment matrix. The consistency of the matrix is checked by three consistency parameters of consistency index CI, average random consistency index RI and random consistency ratio CR. The consistency index CI is calculated as
Figure BDA0003038113250000053
A random consistency ratio CR look-up table 2, the random consistency ratio CR calculation formula is
Figure BDA0003038113250000054
When CR < 0.1, the decision matrix is considered to have complete consistency, and is valid at this time.
In the formula, λmaxThe maximum characteristic root of the judgment matrix is shown, and n represents the order number of the judgment matrix.
Table 21-13 order matrix RI values
Order of the scale 1 2 3 4 5 6 7 8 9 10 11 12 13
RI 0 0 0.52 0.89 1.12 1.26 1.36 1.41 1.46 1.49 1.52 1.54 1.56
(3) The relative weights of the elements under a single criterion are calculated. The specific process is as follows: calculating the product of the elements of each row of the decision matrix
Figure BDA0003038113250000061
Calculating MiRoot of cubic (n times)
Figure BDA0003038113250000062
To make the total weight 1, calculate
Figure BDA0003038113250000063
Normalization
Figure BDA0003038113250000064
The index weight W of each layer is obtained as (W)1,W2,...,Wn)。
The concrete implementation method of the third step is as follows:
and according to the altitude condition and the air density condition of the high-altitude mine, scoring each index by using a fuzzy comprehensive evaluation method. The specific algorithm of the fuzzy comprehensive evaluation is as follows:
equivalent air volume
Figure BDA0003038113250000065
Wind pressure
Figure BDA0003038113250000066
Output power of fan
Figure BDA0003038113250000067
Efficiency of the fan
Figure BDA0003038113250000068
Output power b of motor1＝100-4(h-1000)×10-3Efficiency of the electric machine b2＝100-4(h-1000)×10-4Strength of insulating material
Figure BDA0003038113250000069
Energy consumption of fan
Figure BDA00030381132500000610
Investment of fan
Figure BDA00030381132500000611
Wherein h (m) represents a high-altitude mineAltitude, ρh(kg/m3) represents the air density at altitude h,
Figure BDA00030381132500000612
the maximum ambient temperature compensation value t required for increasing the altitude of 1000-5000 m by 1mat(° c) represents the maximum ambient temperature of the location where the motor is used.
The concrete implementation method of the fourth step is as follows:
the established high-altitude mine ventilator efficiency level grade is divided and shown in a table 3, and the final evaluation score is compared with the table 3 to obtain the high-altitude mine ventilator efficiency level evaluation grade.
Table 3 ventilation efficiency level rating scale
Level value S of ventilation efficiency S≥90 80≤S＜90 70≤S＜80 60≤S＜70 S＜60
Level of ventilation effectiveness Is excellent in Good effect In general Is poor Is very poor
Examples of the applications
The ventilation efficiency levels of three mine fans with the elevations of 3600m, 2700m and 1500m are evaluated by using the evaluation method provided by the invention so as to show the specific use and evaluation effect of the evaluation method. It is known that: the atmospheric pressure at the altitude of 3600m is 66.58kPa, the air density is 0.792kg/m3 and is about 66 percent of the air density of a standard area; the atmospheric pressure at the altitude of 2700m is 73946Pa, the air density is 0.879kg/m3 and is about 73 percent of the air density of a standard area; the atmospheric pressure at the altitude of 1500m is 85058Pa, the air density is 1.011kg/m3, and the air density is about 84% of that of the standard area.
(1) And establishing an efficiency evaluation index system of the high-altitude mine ventilator, which is shown in the attached figure 1.
(2) And (5) constructing a judgment matrix through expert scoring, checking the consistency of the judgment matrix, and calculating the weight value of each index.
Figure BDA0003038113250000071
Is calculated to obtain
Figure BDA0003038113250000072
The RI obtained by looking up table 2 is 0.52, and is calculated,
Figure BDA0003038113250000073
it can be seen that the matrix meets the consistency requirement. Calculating the relative weight of the elements under a single criterion to obtain the first-layer index weight
Figure BDA0003038113250000074
Figure BDA0003038113250000075
Is calculated to obtain
Figure BDA0003038113250000076
The RI is found to be 0.89 by looking up the table 2, and is calculated,
Figure BDA0003038113250000077
it can be seen that the matrix meets the consistency requirement. Calculating the relative weight of the elements under a single criterion to obtain the index weight
Figure BDA0003038113250000081
Figure BDA0003038113250000082
Is calculated to obtain
Figure BDA0003038113250000083
The RI obtained by looking up table 2 is 0.52, and is calculated,
Figure BDA0003038113250000084
it can be seen that the matrix meets the consistency requirement. Calculating the relative weight of the elements under a single criterion to obtain the index weight
Figure BDA0003038113250000085
Figure BDA0003038113250000086
Is calculated to obtain
Figure BDA0003038113250000087
Looking up table 2 to obtain RI ═ 0, and when CI and RI are both 0, CR ═ 0, it can be seen that the matrix meets the consistency requirement. Calculating the relative weight of the elements under a single criterion to obtain the index weight
Figure BDA0003038113250000088
To sum up, the first and second layer index weights are:
Figure BDA0003038113250000089
W＝(Wsa1,Wsa2,Wsa3,Wsa4,Wsb1,Wsb2,Wsb3,Wsc1,Wsc2)
＝(0.15,0.2,0.05,0.05,0.05,0.05,0.1,0.25,0.1)
(3) the indexes are scored by a fuzzy comprehensive evaluation method, and the scores of the indexes are shown in a table 4 according to the specific algorithm.
TABLE 4 score of each index
Index (I) a1 a2 a3 a4 b1 b2 b3 c1 c2
Altitude of 3600m 64.52 64.52 41.63 41.63 88.80 98.60 72.00 34.89 41.05
Altitude 2700m 73.36 73.36 53.82 53.82 93.2 99.15 83.00 49.69 53.36
Altitude 1500m 84.38 84.38 71.20 71.20 98.00 99.75 95.00 72.36 71.03
(4) And carrying out weighted calculation on the index scores to obtain the final evaluation score. The second-layer index weight W is (0.15,0.2,0.05,0.05,0.05,0.05,0.1,0.25,0.1), and the levels of ventilation efficiency of the mine fans at the altitudes of 3600m, 2700m, and 1500m are calculated as follows: 56.14 points, 66.73 points and 81.23 points.
(5) And obtaining the evaluation level of the fan efficiency level. Comparing with the performance level grading of the high-altitude mine ventilator in the table 3, the performance levels of the three mine ventilators at the altitudes of 3600m, 2700m and 1500m are respectively poor, poor and good.

Claims (8)

1. The method for evaluating the efficiency of the high-altitude mine ventilator based on the hierarchical model is characterized by comprising the following steps of:
the method comprises the following steps: analyzing the influence of the characteristics of the high-altitude environment on the efficiency of the high-altitude mine ventilator, screening out important influencing factors, extracting evaluation indexes, carrying out hierarchical classification on all the index factors, and establishing an evaluation index system.
Step two: and determining the weighted value of each index by an analytic hierarchy process according to the relative importance of each index by combining the influence rule of each pair of high-altitude mine ventilator efficiencies.
Step three: and determining the scoring rule of each index by combining the influence rule of each index on the efficiency of the high-altitude mine ventilator, scoring each index and performing weighted calculation to obtain a final evaluation score.
Step four: and establishing proper high-altitude mine ventilator efficiency level grades to divide the intervals, and comparing the final obtained result with the calculated final obtained result to obtain the high-altitude mine ventilator efficiency level grade.
2. The method for evaluating the efficiency of a high-altitude mine ventilator according to claim 1, wherein in the first step:
the ventilator efficiency level mainly comprises three aspects of a fan, a motor and economic benefits.
The key indexes of the fan comprise equivalent air volume, air pressure, fan output power and fan efficiency.
Key indicators for the motor include motor output power, motor efficiency, and insulation strength.
Key indicators of economic benefit include fan energy consumption and fan investment.
3. The method for evaluating the efficiency of the high-altitude mine ventilator according to claim 1, wherein in the second step, the relative importance of each index is determined by expert scoring, a judgment matrix is established, consistency is checked, and the relative weight of elements under a single criterion is calculated, so that the weight value of each index can be obtained.
4. The method for evaluating the efficiency of the high-altitude mine ventilator according to claim 3, wherein the specific process of calculating the relative weights of the elements under the single criterion in the second step is as follows:
calculating the product of the elements of each row of the decision matrix
Figure FDA0003038113240000021
Calculating MiRoot of cubic (n times)
Figure FDA0003038113240000022
To make the total weight 1, calculate
Figure FDA0003038113240000023
Normalization
Figure FDA0003038113240000024
The index weight W of each layer is obtained as (W)1,W2,...,Wn)。
5. The method for evaluating the efficiency of the ventilator for the high-altitude mine based on the hierarchical model as claimed in claim 1, wherein in the third step, the indexes are scored by using a fuzzy comprehensive evaluation method mainly according to the altitude condition and the air density condition of the high-altitude mine.
6. The method for evaluating the efficiency of the high-altitude mine ventilator based on the hierarchical model as claimed in claim 5, wherein the specific algorithm of the fuzzy comprehensive evaluation in the third step is as follows:
equivalent air volume
Figure FDA0003038113240000025
Wind pressure
Figure FDA0003038113240000026
Output power of fan
Figure FDA0003038113240000027
Efficiency of the fan
Figure FDA0003038113240000028
Output power b of motor1＝100-4(h-1000)×10-3Efficiency of the electric machine b2＝100-4(h-1000)×10-4Strength of insulating material
Figure FDA0003038113240000029
Energy consumption of fan
Figure FDA00030381132400000210
Investment of fan
Figure FDA00030381132400000211
Wherein h (m) represents the altitude, rho, of the high-altitude mineh(kg/m3) represents the air density at altitude h,
Figure FDA00030381132400000212
the maximum ambient temperature compensation value t required for increasing the altitude of 1000-5000 m by 1mat(° c) represents the maximum ambient temperature of the location where the motor is used.
7. The method for evaluating the efficiency of a high-altitude mine ventilator according to claim 1, wherein the level of the efficiency of the high-altitude mine ventilator in the fourth step is graded as follows:
excellence (score S is more than or equal to 90 and less than or equal to 100), excellence (score S is more than or equal to 80 and less than 90), general (score S is more than or equal to 70 and less than 80), worse (score S is more than or equal to 60 and less than 70) and worse (score S is less than 60).
8. The method for evaluating the efficiency of the high-altitude mine ventilator according to claim 1, wherein the fan performance index score obtained in the third step is weighted according to the index weight obtained in the second step to obtain a final score, and the high-altitude mine ventilator efficiency level grade is obtained by dividing intervals according to the high-altitude mine ventilator efficiency level grade obtained in the fourth step.
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