CN114622944B - On-demand frequency conversion air adjusting system and method for mine multi-fan combined operation - Google Patents
On-demand frequency conversion air adjusting system and method for mine multi-fan combined operation Download PDFInfo
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- CN114622944B CN114622944B CN202210407595.7A CN202210407595A CN114622944B CN 114622944 B CN114622944 B CN 114622944B CN 202210407595 A CN202210407595 A CN 202210407595A CN 114622944 B CN114622944 B CN 114622944B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a frequency conversion air regulating system and method based on requirements of mine multi-fan combined operation, aiming at a ventilation system of multi-main fan combined operation, considering the mutual influence characteristics of the multi-fans and the dynamic demand of air volume of key air using places in the pit, realizing the intelligent regulation and control of the multi-main fans on the branch air volume in the pit, analyzing the demand of harmful gas and personnel on breathing in real time, and dynamically calculating the air volume needed by the air using places; the operating condition parameters needing to be adjusted of the main ventilators are quickly solved by using a loop wind pressure analytic method, the frequency required by the ventilators is searched in real time in a fan curve library, and the operating condition parameters of the ventilators after the frequency conversion regulation and control of the main ventilators as required and the ventilation parameters of underground roadways are simulated in advance by using a wind network solving technology, so that the accurate, stable, real-time and quick intelligent regulation and control of the underground branch wind volume by the main ventilators are realized, and the disaster accident caused by abnormal ventilation is prevented.
Description
Technical Field
The invention relates to the technical field of mine ventilation, in particular to an on-demand variable-frequency air adjusting system and an air adjusting method thereof for combined operation of multiple mine fans.
Background
The mine ventilation system is one of the most important systems in a coal mine production system and is a main measure for ensuring safe production. Along with stope space change, time lapse and mining condition change, the air volume demand of each wind utilization place is constantly changing. The current colliery air regulation measure mainly can divide into main fan in ground and the ventilation facility in pit and transfer wind, mine ventilation network is the multivariable complex system that the associated degree is very high, the windage change in a certain place all can arouse the amount of wind change in other places, the ventilation facility in pit adjusts not only can lead to the amount of wind of a plurality of branches to change, arouse whole wind network disorder, cause great potential safety hazard even, and ventilation facility can only increase the resistance in tunnel, after adjusting many times, the total resistance of mine can increase by multiples, thereby increase the ventilation energy consumption. And the ventilation of the main ground fan can only synchronously increase or reduce the branch air quantity according to the basic rule of air flow distribution, and the disorder of the air flow of the air network can not be caused. Therefore, the air regulation of the main ground fan is the easiest, low-risk and low-cost regulation mode for regulating the air quantity of the mine. With the increase of mining depth of mines and the continuous expansion of mining range, a single-fan ventilation system cannot meet the ventilation requirements of various large mines, most of the mines adopt the mode of increasing main fans and main air inlet shafts for ventilation, and the ventilation can be divided into a central parallel mode, a diagonal mode, a regional mode and a mixed mode according to the positions of a plurality of air inlets. However, the ground main fans of most mines adopt maximum power ventilation at present, so that the requirement for air supply at underground wind utilization places cannot be met, the main fans operate at high power for a long time, the energy consumption is high, and the concept of green low-carbon cycle development of the mines at present is not met. In recent years, with the progress of intelligent ventilation construction of mines, the demand-based regulation and control of main mine fans are the basis for realizing intelligent control of the mines, so that a demand-based frequency conversion air regulating system and method for combined operation of multiple mine fans are provided, and an accurate, demand-based, intelligent and quick multi-fan frequency conversion air regulating method can be provided for intelligent air control of the mines.
Disclosure of Invention
Aiming at the problems and requirements, the scheme provides the frequency conversion air adjusting system and method based on the requirements for the combined operation of the multiple fans of the mine.
One objective of the present invention is to provide an on-demand variable frequency air conditioning system for combined operation of multiple mine fans, which comprises:
the ground main fan parameter monitoring subsystem is used for monitoring working condition parameters of a plurality of main fans of the mine in real time;
the underground ventilation parameter monitoring subsystem is used for monitoring the ventilation parameters of all underground key air-required tunnels in real time and calculating the air quantity of the key air-required tunnels based on the concentration of harmful gas of the key air-required tunnels and the number of workers;
the multi-fan on-demand optimal frequency conversion air regulation subsystem is used for calculating the air quantity and the air pressure required by the main fan and the optimal fan frequency value according to the air quantity required by the air branch for the mine underground, and calculating the air quantity of each underground roadway branch and the air quantity and the air pressure of each main fan after regulation;
and the ground monitoring center is used for carrying out data interaction and comprehensive analysis display on all monitored parameters, sending a control command to the appointed fan frequency converter, and alarming and carrying out comprehensive decision of an emergency scheme when an abnormal value is monitored.
In one example of the invention, the downhole ventilation parameter monitoring subsystem comprises:
the ventilation parameter monitoring module is used for monitoring the wind speed values of a plurality of key wind-required tunnels in real time and obtaining the wind speed value of each tunnel by using the tunnel section value;
and the air demand calculation module is used for monitoring the gas concentration values of carbon dioxide, carbon monoxide, methane and oxygen in the air of the key air demand lanes in real time, positioning the number of personnel and calculating the air demand of each key air demand lane.
In one example of the invention, the multi-fan on-demand optimal variable frequency wind regulation subsystem comprises:
the air network parameter data analysis module is used for carrying out air network calculation on the ventilation parameters monitored underground and analyzing whether the air quantity of the key air-required roadway meets the air quantity requirement or not, and alarming and calculating the air requirement of the key air-required roadway if the current air quantity is smaller than the air quantity requirement;
each main fan working condition calculation module is used for calculating the current working condition parameters of each main fan according to the monitored fan working condition parameters and ventilation parameters, and the required air volume and required air pressure required to be realized by each main fan in order to meet the required air volume of the key air-required roadway;
and the frequency calculation module required by each main fan is used for searching the working condition point with the highest operation efficiency of each main fan in the stable working area of each main fan according to the required air volume and the required air pressure required to be realized by each main fan and searching the optimal required fan frequency in the curve library.
The invention also aims to provide an air adjusting method of the frequency conversion on demand air adjusting system with the combined operation of the multiple mine fans, which comprises the following steps:
s10: acquiring working condition parameters of each main fan by a ground main fan parameter monitoring subsystem, acquiring ventilation parameters and air demand of each key roadway by an underground ventilation parameter monitoring subsystem, calculating fan air regulation sensitivity of branch air quantity in real time, and uploading all the data to a ground monitoring center for storage;
s20: the multi-fan on-demand optimal frequency conversion air regulation subsystem utilizes data stored in a ground monitoring center to fit a wind pressure curve equation of each fan, establishes a wind pressure characteristic curve equation of the current fan under different frequencies of 0-50Hz according to a main fan proportional law, stores the wind pressure characteristic curve equation into a fan curve library for searching, judges whether the difference value of the current wind volume and the required wind volume is within a threshold range in real time, and shifts to the previous step if the difference value is within the threshold range, otherwise performs corresponding wind volume regulation and control according to the position of a wind network where the required wind tunnel is located;
s30: calculating the required adjustment working condition of each fan by using a loop wind pressure analytic method, judging whether the required working condition parameters of each fan operate in a fan unstable area, if the working condition parameters operate in the fan unstable area, searching the required adjustment frequency in a fan curve library according to the required working condition of the fan, otherwise, rapidly alarming, uploading the analysis result to a ground monitoring center to display a request artificial decision, and simultaneously regulating and controlling the fan to the maximum wind volume value which ensures that the fan operates stably and is in a wind network safety state;
s40: bringing in wind network resolving software according to required adjusting frequency to simulate the working condition of each fan in advance, judging whether the wind volume of each tunnel exceeds the allowable range of the wind volume, if the wind volume exceeds the allowable range of the wind volume, alarming and uploading the analysis result to a ground monitoring center to display and request manual decision, and meanwhile, regulating and controlling the fans to the maximum wind volume value which ensures that the fans run stably and is in a wind network safety state, otherwise, outputting the calculated regulation and control scheme to the ground monitoring center, and when the staff determines that no other safety risks exist, carrying out multi-fan remote frequency conversion regulation and control on demand quickly by one key.
In one example of the present invention, in step S10, the method of calculating the fan wind adjustment sensitivity of the branch wind volume includes the steps of:
aiming at the branch of the area where the fan belongs, when the fan air quantity Q f Change Δ Q f When the wind is in the normal state, the wind volume change Δ Q of the branch i of the region to which the wind belongs i Amount of change Δ Q of air volume in branch i i And the amount of change delta Q of the fan air volume f The limit of the ratio is the wind adjusting sensitivity delta of the fan i The calculation formula is as follows:
in an example of the present invention, in step S10, among the main fan operating parameters, the fan air quantity parameter obtaining method includes the following steps:
when wind current flows in a pipeline with variable cross sections, the energy equation between two different cross sections can be obtained according to the Bernoulli equation:
in the formula: p 1 、P 2 Static pressure, pa, of the section 1 and the section 2; v. of 1 、v 2 Wind speed of section 1 and section 2，m/s；Z 1 、Z 2 The elevation of the section 1 and the elevation of the section 2 are m, and the elevation of the two sections is the same for the fan; rho is wind current density, kg/m 3 (ii) a g is gravity acceleration, m/s 2 ；h 1-2 The resistance between two sections, pa, is negligible because the two sections are very close;
the expression of the air quantity and the air speed in the pipeline is as follows:
Q＝Sv
the formula for calculating the air volume based on the static pressure difference of different sections can be obtained by combining the two formulas as follows:
in the formula: s. the 1 、S 2 Is the cross-sectional area of section 1 and section 2, m 2 。
In an example of the present invention, in step S20, the establishing a wind pressure characteristic curve equation of the current fan at different frequencies between 0Hz and 50Hz includes the following steps:
the wind pressure characteristic equation of the current frequency of a certain fan is assumed as follows:
the wind pressure characteristic equation of any frequency is as follows:
order:
A i0 ＝A 00 K 1 ；A i1 ＝A 01 K 1 K 2 ；A i2 ＝A 02 K 1 K 2 2
in the formula: h f0 And H fi Respectively the current frequencyThe wind pressure of the blower and the wind pressure of the blower of the ith frequency; q 0 And Q i Respectively the air volume of a fan with the current frequency and the air volume of a fan with the ith frequency; a. The 00 、A 01 、A 02 And A i0 、A i1 、A i2 Three parameters of a fan wind pressure characteristic equation of the current frequency and the ith frequency are set; and i is the number of the fan curves.
In an example of the present invention, in step S20, performing corresponding air volume regulation according to a position of a wind grid where a required wind tunnel is located includes:
if the required air lane belongs to the area of the fan, calculating the required air volume and the required air pressure of the main fan of the fan area according to the required air volume value of the current key required air lane by utilizing the air regulation sensitivity of the fan, and rapidly calculating the required fan working condition parameters of the fans by utilizing a loop air pressure analytic method on the premise of comprehensively considering the mutual influence of the fans on the premise of ensuring the branch air volume of the area to which other fans belong to be unchanged;
if the air-required tunnel belongs to a public branch area, the air quantity value is required to be adjusted to be the air quantity value required to be increased of all the fans, the air quantity required to be increased of each fan is obtained through calculation of an air quantity distribution basic rule, the required air pressure value can be obtained through calculation according to a loop air pressure analytic method, and further the working condition parameter value required to be adjusted of each fan can be obtained.
In an example of the present invention, in step S30, the loop wind pressure analysis method includes the steps of:
aiming at a ventilation network with a plurality of fans, the air quantity before each fan is regulated is assumed to be Q 1 ，Q 2 ，Q 3 …Q n (ii) a The wind pressure of the fan is H f1 ，H f2 ，H f3 …H fn (ii) a The adjusted wind pressure of the fan is H' f1 ，H′ f2 ，H′ f3 …H′ fn (ii) a The wind resistance of the area to which each fan belongs is R 1 ，R 2 ，R 3 …R n (ii) a The branch wind resistance of the common section is R 0 (ii) a The branch air volume of the public section is Q 0 (ii) a The air quantity required to be increased by each fan is delta Q 1 ，ΔQ 2 ，ΔQ 3 …ΔQ n (ii) a Air volume change delta Q of public branch section 0 ＝ΔQ 1 +ΔQ 2 +ΔQ 3 +…+ΔQ n ；
Before regulation and control, a loop wind pressure equation is established for the fan 1:
before regulation and control, a loop wind pressure equation is established for the fan 2:
before regulation and control, a loop wind pressure equation is established for the fan 3:
……
before regulation and control, a loop wind pressure equation is established for the fan n:
the establishment of a loop wind pressure equation for the fan 1 after the regulation and control of the wind quantity of each fan comprises the following steps:
H′ f1 ＝R 1 (Q 1 +ΔQ 1 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
after regulation and control, the loop wind pressure equation is established for the fan 2 as follows:
H′ f2 ＝R 2 (Q 2 +ΔQ 2 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
after regulation and control, the loop wind pressure equation is established for the fan 3 as follows:
H′ f3 ＝R 3 (Q 3 +ΔQ 3 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
……
after regulation and control, the loop wind pressure equation is established for the fan n as follows:
H′ fn ＝R n (Q n +ΔQ n ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
the wind pressure required to be adjusted after the fan 1 is adjusted according to needs can be obtained by combining the above equations:
ΔH f1 ＝H′ f1 -H f1 ＝2R 1 Q 1 ΔQ 1 +R 1 ΔQ 1 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the wind pressure that needs to adjust after fan 2 adjusts as required does:
ΔH f2 ＝H′ f2 -H f2 ＝2R 2 Q 2 ΔQ 2 +R 2 ΔQ 2 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the wind pressure that needs to adjust after fan 3 adjusts as required does:
ΔH f3 ＝H′ f3 -H f3 ＝2R 3 Q 3 ΔQ 3 +R 3 ΔQ 3 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
……
the wind pressure required to be adjusted after the fan n is adjusted according to the requirement is as follows:
ΔH fn ＝H′ fn -H fn ＝2R n Q n ΔQ n +R n ΔQ n 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the required operating condition of the fan 1 after the adjustment is (Q) 1 +ΔQ 1 ，H f1 +ΔH f1 ) The required operating condition of the fan 2 is (Q) 2 +ΔQ 2 ，H f2 +ΔH f2 ) The required operating condition of the fan 3 is (Q) 3 +ΔQ 3 ，H f3 +ΔH f3 ) 8230and the required working condition of fan n is (Q) n +ΔQ n ，H fn +ΔH fn )。
In one example of the present invention, in step S30, searching the fan curve library for the required adjusting frequency according to the required operating condition of the fan includes:
and if the difference between the absolute value of the calculated wind pressure of the fan and the absolute value of the required wind pressure is found to be within the set precision range, outputting the frequency value of the current wind pressure curve equation, and calculating and outputting the required frequency values of other fans.
The following description of the preferred embodiments for carrying out the present invention will be made in detail with reference to the accompanying drawings so that the features and advantages of the present invention can be easily understood.
Compared with the prior art, the invention has the following beneficial effects:
the invention aims to overcome the defects of the prior art and provides the frequency-conversion air-conditioning system and method based on the requirement for the combined operation of the multiple mine fans, which have the advantages of high adjusting precision, strong stability, high ventilation efficiency and good use effect. In a ventilation network with multiple fans operating in a combined mode, a coal mine monitoring system is used for monitoring the working conditions and ventilation parameters of the multiple fans in real time, and continuous and efficient operation of the fans is guaranteed. And dynamically calculating the air quantity demand based on the harmful gas and the breathing demand of the personnel. A fan curve library under different frequencies is established by using a fan frequency conversion technology, working condition parameters needing to be adjusted of a plurality of main ventilators can be solved by using a loop wind pressure analysis method, and the required fan frequency is searched in the fan curve library in real time according to the required working condition parameters, so that the rapid generation of a regulation and control scheme according to the requirement for the combined operation of the plurality of fans is realized. And the working condition parameters of all ventilators and the ventilation parameters of all underground roadways after the variable-frequency regulation and control of the multiple fans as required are simulated in advance by utilizing a wind network resolving technology. When safety risks such as insufficient air volume of partial roadways, excessive concentration of harmful gases and the like occur, early warning can be rapidly carried out, and analysis results can be uploaded to a ground monitoring center to be displayed for decision reference of personnel. Therefore, the intelligent regulation and control of the main ventilator on the underground branch air quantity accurately, stably, in real time and quickly is realized, the dynamic air consumption requirement of an underground key air consumption place can be fully guaranteed, the intelligent regulation and control method for the multi-fan combined operation is provided for the construction of the intelligent ventilation system of the mine, the safe, energy-saving and intelligent operation of the main ventilator is realized, and the concept of green and low-carbon cycle development of the mine is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the invention and are not to be construed as limiting the invention to all embodiments thereof.
FIG. 1 is a schematic diagram of an on-demand variable frequency air conditioning system for combined operation of multiple mine fans according to an embodiment of the invention;
FIG. 2 is a flow chart of an air adjusting method of an on-demand variable frequency air adjusting system for combined operation of multiple mine fans according to an embodiment of the invention;
FIG. 3 is an exemplary diagram of frequency-conversion-on-demand regulation of combined operation of multiple mine fans according to an embodiment of the present invention.
List of reference numerals:
a wind adjustment system 100;
a ground main fan parameter monitoring subsystem 10;
a high-voltage inverter 11;
an efficiency calculation module 12 of the ventilator;
a high-precision differential pressure sensor 13;
a first temperature and humidity sensor 14;
a motor shaft temperature sensor 15;
a shock sensor 16;
an atmospheric pressure sensor 17;
a downhole ventilation parameter monitoring subsystem 20;
a ventilation parameter monitoring module 21;
a wind speed sensor 211;
a wind pressure sensor 212;
a second temperature/humidity sensor 213;
an air demand calculation module 22;
a carbon monoxide sensor 221;
a carbon dioxide sensor 222;
a personnel location module 223;
a methane sensor 224;
an oxygen sensor 225;
a downhole monitoring substation module 23;
a multi-fan optimal frequency conversion wind adjusting subsystem 30 according to requirements;
a wind network parameter data analysis module 31;
each main fan operating condition calculation module 32;
a frequency calculation module 33 required by each main fan;
a ground monitoring center 40;
a decision platform 41;
a database 42;
a server 43;
an integrated display terminal 44;
an industrial ethernet communications subsystem 50;
an ethernet communication module 51.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims of the present application does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
According to a first aspect of the present invention, an on-demand variable frequency air conditioning system for mine multi-fan combined operation is shown in fig. 1, and includes: the system comprises a ground main fan parameter monitoring subsystem 10, a downhole ventilation parameter monitoring subsystem 20, a multi-fan optimal frequency conversion wind adjusting subsystem 30 according to needs, a ground monitoring center 40 and an industrial Ethernet communication subsystem 50;
the ground main fan parameter monitoring subsystem 10 is used for monitoring working condition parameters of a plurality of main fans of a mine in real time;
specifically, the ground main fan parameter monitoring subsystem 10 includes: the system comprises a high-voltage frequency converter 11, a high-precision differential pressure sensor 13, a ventilator efficiency calculation module 12, a motor shaft temperature sensor 15, a vibration sensor 16, an atmospheric pressure sensor 17 and a first temperature and humidity sensor 14.
The high-voltage frequency converter 11 is used for monitoring motor working condition parameters of each main ventilator, and comprises current, voltage, rotating speed, frequency and shaft power of the motor, and controlling the frequency of the motor;
the high-precision differential pressure sensor 13 is used for monitoring the static pressure difference of two sections of the fan and the total pressure of the fan in real time;
and an efficiency calculation module 12 of the ventilator, which is used for calculating the ventilation efficiency in real time according to the monitored electric parameters of the motor and the monitored ventilation parameters.
And the motor shaft temperature sensor 15 is used for monitoring the motor shaft temperature of each main ventilator in real time and giving an alarm when the shaft temperature exceeds a threshold value.
And the vibration sensor 16 is used for monitoring the vibration intensity of the main ventilator in real time, and alarming in time when the vibration of the ventilator exceeds a threshold value so as to prevent the ventilator from being damaged by resonance.
And the atmospheric pressure sensor 17 and the first temperature and humidity sensor 14 are respectively used for monitoring the atmospheric pressure and the temperature and humidity at the ventilator in real time and calculating the density of the wind flow.
For example, the high-voltage frequency converter 11 of the ground main fan parameter monitoring unit is provided with two MICROMASTER (siemens) 430-155KVA frequency converters (one for two) for each air shaft; the high-precision differential pressure sensor 13 is a GPD5 mining differential pressure sensor, and the precision is +/-0.5F.S; the first temperature and humidity sensor 14 is a GWSD100 mining intrinsic safety type temperature and humidity sensor; the vibration sensor 16 is a GBD20 mining intrinsic safety type vibration sensor; atmospheric pressure sensor 17 is KGY5 type atmospheric pressure sensor, and measuring range: 80-120KPa, and the precision is +/-0.2 KPa; the sensor data are collected by Siemens s7-1500 series plc controllers and I/O modules and uploaded to the ground monitoring center 40 for analysis.
The underground ventilation parameter monitoring subsystem 20 is used for monitoring the ventilation parameters of all underground key air-required tunnels in real time and calculating the air quantity required by the key air-required tunnels based on the concentration of harmful gas in the key air-required tunnels and the number of working people;
specifically, the downhole ventilation parameter monitoring subsystem 20 includes:
the ventilation parameter monitoring module 21 is used for monitoring the wind speed values of a plurality of key wind-required roadways in real time and obtaining the wind speed value of each roadway by using the roadway section value; the ventilation parameter monitoring module 21 is configured to monitor wind speed values of a plurality of key air-required tunnels in real time, and obtain a wind speed value of each tunnel and other ventilation environment parameters in the tunnel by using a tunnel section value. Each tunnel air volume calculation module comprises an air velocity sensor 211, a wind pressure sensor 212 and a second temperature and humidity sensor 213.
The air demand calculation module 22 is configured to monitor gas concentration values of carbon dioxide, carbon monoxide, methane and oxygen in the air of the key air demand lanes in real time, locate the number of people, and calculate the air demand of each key air demand lane, where the air demand calculation module 22 includes a carbon dioxide sensor 222, a methane sensor 224, a carbon monoxide sensor 221, an oxygen sensor 225, and a people location module 223.
And the underground monitoring substation module 23 is used for acquiring data of each sensor, inputting the data into each calculation module, and uploading results obtained by the ventilation parameter monitoring module 21 and the air demand calculation module 22 to the ground monitoring center 40.
For example, the wind speed sensor 211 in the downhole ventilation parameter monitoring subsystem 20 is a GFW15 wind speed sensor, and uploads the monitored wind speed to a monitoring substation for processing and analysis; the air demand calculation module 22 needs to monitor the underground harmful gas and the oxygen supply demand of personnel in real time.
The multi-fan on-demand optimal frequency conversion air-conditioning subsystem 30 is used for calculating the air quantity and the air pressure required by the main fans according to the air quantity and the optimal fan frequency value of the air branch for the mine underground, and calculating the air quantity of each underground roadway branch and the air quantity and the air pressure of each main fan after adjustment;
specifically, the multi-fan on-demand optimal frequency conversion wind adjustment subsystem 30 includes:
the air network parameter data analysis module 31 is used for carrying out air network calculation on the ventilation parameters monitored underground and analyzing whether the air volume of the key air-required tunnel meets the air volume requirement, and if the current air volume is smaller than the air volume requirement, alarming and calculating the air requirement of the key air-required tunnel;
each main fan working condition calculating module 32 is used for calculating the current working condition parameter of each main fan according to the monitored fan working condition parameter and ventilation parameter, and the required air volume and required air pressure required to be realized by each main fan in order to meet the required air volume of the key air channel;
and the required frequency calculation module 33 of each main fan is used for searching the working condition point with the highest operating efficiency of each main fan in the stable working area of each main fan according to the required air volume and the required air pressure which are required to be realized by each main fan, and searching the optimal required fan frequency in the curve library.
And the ground monitoring center 40 is used for performing data interaction and comprehensive analysis and display on all monitored parameters, sending a control command to a designated fan frequency converter, and alarming and performing comprehensive decision of an emergency scheme when an abnormal value is monitored.
Specifically, the ground monitoring center 40 includes,
the decision platform 41 is used for decision analysis of underground wind demand change, working conditions of a main ground fan and a frequency conversion regulation and control scheme according to needs;
the database 42 is used for recording and storing data monitored by each monitoring system, and calling and analyzing the ground main fan parameter monitoring subsystem 10, the underground ventilation parameter monitoring subsystem 20 and the multi-fan optimal frequency conversion wind adjusting subsystem 30 according to needs;
the server 43 is used for performing data storage, data calculation and analysis and data interaction among systems on the ground main fan parameters and the underground ventilation parameters;
and the comprehensive display terminal 44 is used for displaying the ventilation parameters of all underground roadways and the working condition parameters of all main fans.
The wind adjustment system 100 further includes: the industrial ethernet communications subsystem 50 comprises: and the Ethernet communication module 51 is used for transmitting underground ventilation parameters, air demand and working condition parameters of the main ventilator and transmitting instructions of a frequency conversion air regulation scheme.
The specific working principle of the air regulating system 100 is as follows: firstly, a ground main fan parameter monitoring subsystem 10 acquires working condition parameters of each main fan, a downhole ventilation parameter monitoring subsystem 20 acquires ventilation parameters and air quantity demand of each key roadway, then a multi-fan on-demand optimal frequency conversion air regulation subsystem 30 fits a wind pressure curve equation of each fan by using data stored in a ground monitoring center 40, establishes a wind pressure characteristic curve equation of the current fan under different frequencies of 0-50Hz according to a main fan proportionality law, stores the wind pressure characteristic curve equation into a fan curve library for searching, judges whether the difference value of the current wind quantity and the air quantity demand is within a threshold range, and turns to the previous step if the difference value is within the threshold range, otherwise, performs corresponding wind quantity regulation according to the position of a wind network where a required wind roadway is located; then, calculating the adjusting working condition required by each fan, judging whether the working condition parameters required by each fan operate in the unstable area of the fan, if the working condition parameters operate in the unstable area of the fan, searching the required adjusting frequency in a fan curve library according to the working condition required by the fan, otherwise, uploading the analysis result to a ground monitoring center 40; and finally, simulating the working condition of each fan in advance according to the required adjusting frequency, judging whether the air volume of each tunnel exceeds the allowable range of the air volume, if so, uploading the analysis result to a ground monitoring center 40 to display and request manual decision, and simultaneously, adjusting and controlling the fans to the maximum air volume value which ensures that the fans run stably and is in a safe wind network state, otherwise, outputting the calculated adjusting and controlling scheme to the ground monitoring center 40, and when the staff determines that no other safety risks exist, quickly performing multi-fan remote frequency conversion adjustment and control as required by one key.
The air regulation system 100 aims at a ventilation system with multiple main ventilators running in a combined mode, the mutual influence characteristics of the multiple ventilators and the dynamic air quantity demand of an underground key air consumption place are fully considered, accurate, stable, real-time and rapid intelligent regulation and control of the multiple main ventilators on the air quantity of the underground branch are achieved, the working conditions of the multiple ventilators and the ventilation parameters of the underground key branch are monitored in real time based on a coal mine monitoring and controlling system, harmful gas and personnel breathing demands are analyzed in real time, the air quantity demand of the air consumption place is dynamically calculated, and when the current air quantity and the air quantity demand are monitored to exceed a set threshold value, a multi-fan combined regulation and control scheme is immediately started. A fan curve library of 0-50Hz is established by utilizing a fan frequency conversion technology. The method comprises the steps of rapidly resolving working condition parameters needing to be adjusted of a plurality of main ventilators by using a loop wind pressure analytic method, searching the needed frequency of the ventilators in a fan curve library in real time, simulating working condition parameters of the ventilators after the frequency conversion adjustment and control of the multiple ventilators according to needs and ventilation parameters of underground roadways in advance by using a wind network resolving technology, and immediately alarming and uploading an analysis result to a ground monitoring center for decision analysis of personnel when the air volume of the underground roadways is not in an air volume allowable range or the working conditions of the ventilators run in an unstable area. Therefore, accurate, stable, real-time and quick intelligent regulation and control of the underground branch air volume by the plurality of main ventilators are realized, and disaster accidents caused by abnormal ventilation are prevented.
According to a second aspect of the present invention, an air adjusting method for an on-demand variable frequency air adjusting system with combined operation of multiple mine fans is shown in fig. 2, and includes the following steps:
s10: the ground main fan parameter monitoring subsystem 10 acquires working condition parameters of each main fan, the underground ventilation parameter monitoring subsystem 20 acquires ventilation parameters and air quantity required by each key roadway, the fan air regulation sensitivity of branch air quantity is calculated in real time, and all data are uploaded to the ground monitoring center 40 through the industrial Ethernet communication subsystem 50 to be stored.
The underground ventilation parameter monitoring subsystem 20 is used for monitoring and analyzing underground ventilation parameters in real time, the air demand of each key air-demand roadway is respectively calculated according to concentration values of harmful gases such as methane, carbon dioxide, carbon monoxide and the like and the number of working people monitored by a plurality of monitoring substations, the maximum air quantity of each key air-demand roadway is taken as the air demand of each key air-demand roadway, the monitoring substations calculate the air demand of each key air-demand roadway, the air quantity parameters of the roadway, the fans of each key air-demand roadway and the fan air regulation sensitivity of branch air quantity, and the calculated air demand is transmitted to the ground monitoring center 40 through the industrial Ethernet and stored. The ground main fan parameter monitoring subsystem 10 monitors and analyzes working condition parameters of a plurality of main fans, electrical parameters can be directly obtained through a high-voltage frequency converter 11, a fan vibration value and a motor shaft temperature can be obtained through corresponding sensors, wind pressure parameters can be obtained through a high-precision differential pressure sensor 13, and fan wind quantity parameters are obtained through calculation according to static pressure difference of two sections of the main fans. And then the ventilation efficiency of each main ventilator is calculated in real time through the ventilator efficiency calculation module 12, the wind flow density of each main ventilator can be obtained through calculation of atmospheric pressure parameters, and all the data are uploaded to the ground monitoring center 40 through the Ethernet for storage.
S20: the multi-fan on-demand optimal frequency conversion air-conditioning subsystem 30 utilizes data stored by the ground monitoring center 40 to fit a wind pressure curve equation of each fan, establishes a wind pressure characteristic curve equation of the current fan under different frequencies of 0-50Hz according to a main fan proportional law, stores the wind pressure characteristic curve equation into a fan curve library for searching, judges whether the difference value of the current wind volume and the required wind volume is within a threshold range in real time, and shifts to the previous step if the difference value is within the threshold range, otherwise performs corresponding wind volume regulation and control according to the position of a wind network where the required wind tunnel is located;
s30: calculating the required adjustment working condition of each fan by using a loop wind pressure analytic method, judging whether the required working condition parameters of each fan operate in a fan unstable area, if the working condition parameters operate in the fan unstable area, searching the required adjustment frequency in a fan curve library according to the required working conditions of the fans, rapidly giving an alarm, uploading the analysis result to a ground monitoring center 40 to display a request artificial decision, and simultaneously regulating and controlling the fans to the maximum wind volume value which ensures that the fans operate stably and is in a wind network safety state;
that is, if the working condition parameters required by each fan calculated by the multi-fan on-demand optimal frequency conversion air-conditioning subsystem 30 can meet the air volume of each key air-conditioning tunnel underground, and each main fan can also reach the expected working condition on the premise of ensuring the efficient operation of the fan, the required frequency calculation module required by each main fan acquires the required fan working condition parameters calculated by the required frequency calculation module of each main fan, the air volume value required by each fan is firstly sequentially brought into the air pressure curve equations with different frequencies in the fan curve library, the air pressure under different frequencies is calculated, and then the air pressure is compared with the air pressure required by each fan, if the difference between the calculated air pressure of the fan and the absolute value of the air pressure of the required fan is found to be within the set precision range, the frequency value of the current air pressure curve equation is output, and the required frequency values of other fans can be calculated in sequence.
S40: bringing in wind network resolving software according to required adjusting frequency to simulate the working condition of each fan in advance, judging whether the wind volume of each tunnel exceeds the allowable range of the wind volume, if the wind volume exceeds the allowable range of the wind volume, alarming and uploading the analysis result to a ground monitoring center 40 to display and request manual decision, and meanwhile, adjusting and controlling the fans to the maximum wind volume value which ensures that the fans run stably and is in a wind network safety state, otherwise, outputting the calculated adjusting and controlling scheme to the ground monitoring center 40, and when the staff determines that no other safety risks exist, carrying out multi-fan remote frequency conversion adjustment and control on demand by one key quickly.
In one example of the present invention, in step S10, the method of calculating the fan register sensitivity of the branch air volume includes the steps of:
aiming at the branch of the area to which the fan belongs, when the air quantity Q of the fan f Variation Δ Q f When the wind quantity of the branch i in the area is changed, the wind quantity of the branch i is changed by delta Q i Amount of change Δ Q of air volume in branch i i And the amount of change delta Q of the fan air volume f The limit of the ratio is the wind adjusting sensitivity delta of the fan i The calculation formula is as follows:
in an example of the present invention, in step S10, among the main fan operating condition parameters, the method for obtaining the fan air volume parameter includes the following steps:
when wind current flows in a pipeline with variable cross sections, the energy equation between two different cross sections can be obtained according to the Bernoulli equation:
in the formula: p 1 、P 2 Static pressure, pa, of the section 1 and the section 2; v. of 1 、v 2 The wind speeds of the section 1 and the section 2 are m/s; z 1 、Z 2 The elevation of the section 1 and the elevation of the section 2 are m, and the elevation of the two sections is the same for the fan; rho is wind flow density, kg/m 3 (ii) a g is the acceleration of gravity, m/s 2 ；h 1-2 Is the resistance between two sections, pa, which are very close and therefore can be ignored;
the expression of the air quantity and the air speed in the pipeline is as follows:
Q＝Sv
the formula for calculating the air volume based on the static pressure difference of different sections can be obtained by combining the two formulas:
in the formula: s. the 1 、S 2 Is the cross-sectional area of section 1 and section 2, m 2 。
In an example of the present invention, in step S20, the establishing a wind pressure characteristic curve equation of the current fan at different frequencies between 0Hz and 50Hz includes the following steps:
the wind pressure characteristic equation of the current frequency of a certain fan is assumed as follows:
the wind pressure characteristic equation of any frequency is as follows:
order:
A i0 ＝A 00 K 1 ；A i1 ＝A 01 K 1 K 2 ；A i2 ＝A 02 K 1 K 2 2
in the formula: h f0 And H fi Respectively the wind pressure of a fan with the current frequency and the wind pressure of a fan with the ith frequency; q 0 And Q i Respectively the air volume of a fan with the current frequency and the air volume of a fan with the ith frequency; a. The 00 、A 01 、A 02 And A i0 、A i1 、A i2 Three parameters of a fan wind pressure characteristic equation of the current frequency and the ith frequency are set; and i is the number of the fan curves.
In an example of the present invention, in step S20, performing corresponding air volume regulation according to a position of a wind grid where a required wind tunnel is located includes:
if the air-required tunnel belongs to the area of the fan, the air quantity required and the air pressure required of the main fan of the fan area are calculated by utilizing the air regulation sensitivity of the fan according to the air quantity value required to be regulated of the current key air-required tunnel, and the working condition calculation module 32 of each main fan rapidly calculates the working condition parameters of the fans on the premise of ensuring the branch air quantity of the area to which other fans belong to be unchanged by utilizing a loop air pressure analytic method on the premise of comprehensively considering the mutual influence of the fans;
if the air-required tunnel belongs to a public branch area, the air quantity value is required to be adjusted to be the air quantity value required to be increased of all the fans, the air quantity required to be increased of each fan is obtained through calculation of an air quantity distribution basic rule, the required air pressure value can be obtained through calculation according to a loop air pressure analytic method, and further the working condition parameter value required to be adjusted of each fan can be obtained.
In an example of the present invention, in step S30, the circuit wind pressure analysis method includes the steps of:
aiming at a ventilation network with a plurality of fans, the air volume before regulation and control of each fan is assumed to be Q 1 ，Q 2 ，Q 3 …Q n (ii) a The wind pressure of the fan is H f1 ，H f2 ，H f3 …H fn (ii) a The adjusted wind pressure of the fan is H' f1 ，H′ f2 ，H′ f3 …H′ fn (ii) a The wind resistance of the area to which each fan belongs is R 1 ，R 2 ，R 3 …R n (ii) a The branch wind resistance of the common section is R 0 (ii) a The branch air quantity of the public section is Q 0 (ii) a The air quantity required to be increased by each fan is delta Q 1 ，ΔQ 2 ，ΔQ 3 …ΔQ n (ii) a Air volume change delta Q of public branch section 0 ＝ΔQ 1 +ΔQ 2 +ΔQ 3 +…+ΔQ n ；
Before regulation and control, a loop wind pressure equation is established for the fan 1:
before regulation and control, a loop wind pressure equation is established for the fan 2:
before regulation and control, a loop wind pressure equation is established for the fan 3:
……
before regulation and control, a loop wind pressure equation is established for the fan n:
the establishment of a loop wind pressure equation for the fan 1 after the regulation and control of the wind quantity of each fan comprises the following steps:
H′ f1 ＝R 1 (Q 1 +ΔQ 1 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
after regulation and control, the loop wind pressure equation is established for the fan 2 as follows:
H′ f2 ＝R 2 (Q 2 +ΔQ 2 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
after regulation and control, the loop wind pressure equation is established for the fan 3 as follows:
H′ f3 ＝R 3 (Q 3 +ΔQ 3 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
……
after regulation and control, the loop wind pressure equation is established for the fan n as follows:
H′ fn ＝R n (Q n +ΔQ n ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
the wind pressure required to be adjusted after the fan 1 is adjusted according to needs can be obtained by combining the above equations:
ΔH f1 ＝H′ f1 -H f1 ＝2R 1 Q 1 ΔQ 1 +R 1 ΔQ 1 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the wind pressure that needs to adjust after fan 2 adjusts as required does:
ΔH f2 ＝H′ f2 -H f2 ＝2R 2 Q 2 ΔQ 2 +R 2 ΔQ 2 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the wind pressure that needs to adjust after fan 3 adjusts as required does:
ΔH f3 ＝H′ f3 -H f3 ＝2R 3 Q 3 ΔQ 3 +R 3 ΔQ 3 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
……
the wind pressure required to be adjusted after the fan n is adjusted according to the requirement is as follows:
ΔH fn ＝H′ fn -H fn ＝2R n Q n ΔQ n +R n ΔQ n 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the required operating condition of the fan 1 after the adjustment is (Q) 1 +ΔQ 1 ，H f1 +ΔH f1 ) The required operating condition of the fan 2 is (Q) 2 +ΔQ 2 ，H f2 +ΔH f2 ) The required operating condition of the fan 3 is (Q) 3 +ΔQ 3 ，H f3 +ΔH f3 ) 8230and the required working condition of fan n is (Q) n +ΔQ n ，H fn +ΔH fn )。
In one example of the present invention, in step S30, searching the fan curve library for the required adjusting frequency according to the required operating condition of the fan includes:
and if the difference between the absolute value of the calculated wind pressure of the fan and the absolute value of the required wind pressure is found to be within the set precision range, outputting the frequency value of the current wind pressure curve equation, and calculating and outputting the required frequency values of other fans.
In an example of the present invention, in step S30, whether the fan required operating condition parameter is operated in the fan unstable region includes:
whether the air volume of each underground branch under the working condition of the adjusted fan exceeds the air volume allowable range, whether the air pressure required by each fan exceeds 90% of the maximum air pressure of the fan and whether the current ventilation efficiency is lower than 60% are calculated;
that is to say, the server 43 may input the required operating condition parameters of each fan into the air grid for resolving, analyze whether the air volume of each branch in the well under the operating condition of the adjusted fan exceeds the air volume allowable range, whether the air pressure required by each fan exceeds 90% of the maximum air pressure of the fan, calculate whether the current ventilation efficiency is lower than 60%, if the data analysis finds that the frequency modulation scheme does not meet the limitation requirement, may alarm quickly, upload the parameter analysis result to the ground monitoring center 40 to display a request manual decision, and adjust and control the fan to the maximum air volume value under the safe state of the air grid and that ensures the stable operation of the fan.
The air regulating method is characterized in that in a ventilation network with multiple fans running in a combined mode, the working conditions and ventilation parameters of the multiple fans are monitored in real time by a coal mine monitoring system, and continuous and efficient operation of the fans is guaranteed; dynamically calculating the air quantity demand based on the harmful gas and the breathing demand of the personnel; the method comprises the steps of establishing a fan curve library under different frequencies by using a fan frequency conversion technology, solving working condition parameters to be adjusted of a plurality of main fans by using a loop wind pressure analysis method, and searching the required fan frequency in the fan curve library in real time according to the required working condition parameters, thereby realizing the rapid generation of a multi-fan combined operation regulation and control scheme according to the requirements; the working condition parameters of all ventilators and the ventilation parameters of all underground roadways after the variable-frequency regulation and control of the multiple ventilators according to needs are simulated in advance by using a wind network resolving technology; when safety risks such as insufficient air volume of partial roadways, excessive concentration of harmful gases and the like occur, rapid early warning can be realized, and analysis results can be uploaded to a ground monitoring center to be displayed for decision reference of personnel; according to the air adjusting method, the multiple main ventilators are subjected to frequency conversion adjustment in real time as required, the air volume requirements of multiple key air utilization places in the pit are met, disaster accidents caused by abnormal ventilation are prevented, and efficient and stable operation of the multiple main ventilators is guaranteed.
The specific embodiment is as follows:
as shown in fig. 3, when the wind resistance curve of the ventilation network is R 0 The fan operating frequency is f 0 Wind of windMechanical characteristic curve N 0 At the moment, the operating condition point of the fan is (Q) B ，H B ) When the air quantity of the fan needs to be increased to Q A In time, the wind resistance R of the ventilation network 0 The characteristic curve database of the fan is brought in, a ventilation network resolving program is utilized to enter the network to resolve, and the fan frequency f meeting the air quantity requirement is calculated 1 Fan characteristic curve N 1 The frequency is converted to the corresponding frequency through the remote control system, so that the frequency conversion adjustment can be realized; similarly, when the air quantity of the fan needs to be reduced to Q C In time, the wind resistance R of the ventilation network 0 The frequency is substituted into a fan characteristic curve database again, and is calculated in a network to obtain the fan frequency f meeting the air quantity requirement 2 Fan characteristic curve N 2 Frequency conversion is carried out to the corresponding frequency through a remote control system, so that frequency conversion adjustment is realized; when ventilation network windage changes, if fan frequency keeps unchanged, then fan operating mode point can change, for example when ventilation network windage increases to R 1 At the moment, the working point of the fan moves up on the characteristic curve of the fan, the air quantity of the mine decreases, and the air pressure increases. If the air quantity Q of the fan needs to be ensured B If not, the wind resistance R of the new ventilation network can be changed 1 The frequency f of the fan meeting the air quantity requirement is calculated by entering the network for calculation in a fan characteristic curve database 3 And the frequency channel corresponding to the frequency is converted through the remote control system, so that the variable frequency regulation of the air quantity according to the requirement is realized.
Although the exemplary embodiment of the present invention of the frequency-on-demand air-conditioning system 100 and the method thereof for combined operation of multiple mine wind turbines has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and changes can be made to the above specific embodiments and various combinations of the technical features and structures of the present invention without departing from the concept of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (9)
1. The utility model provides a many fans of mine combined operation's frequency conversion as required accent wind system which characterized in that includes:
the ground main fan parameter monitoring subsystem (10) is used for monitoring working condition parameters of a plurality of main fans of the mine in real time;
the underground ventilation parameter monitoring subsystem (20) is used for monitoring the ventilation parameters of all underground key air-required tunnels in real time and calculating the air quantity required by the key air-required tunnels based on the concentration of harmful gas of the key air-required tunnels and the number of working people;
the multi-fan on-demand optimal frequency conversion air-conditioning subsystem (30) is used for calculating the air quantity and the air pressure required by the main fans according to the air quantity and the optimal fan frequency value of the air branch for the mine underground, and calculating the air quantity of each underground roadway branch after adjustment and the air quantity and the air pressure of each main fan;
the ground monitoring center (40) is used for carrying out data interaction and comprehensive analysis display on all monitored parameters, sending a control command to a specified fan frequency converter, and alarming and carrying out comprehensive decision of an emergency scheme when an abnormal value is monitored;
wherein, the optimal frequency conversion of many fans as required accent wind subsystem (30) includes:
the air network parameter data analysis module (31) is used for carrying out air network calculation on the ventilation parameters monitored underground and analyzing whether the air quantity of the key air-required roadway meets the air quantity requirement or not, and alarming and calculating the air requirement of the key air-required roadway if the current air quantity is smaller than the air quantity requirement;
each main fan working condition calculation module (32) is used for calculating the current working condition parameter of each main fan according to the monitored fan working condition parameter and ventilation parameter, and the required air volume and required air pressure required to be realized by each main fan in order to meet the required air volume of the key required air roadway;
and the required frequency calculation module (33) of each main fan is used for searching the working condition point with the highest operating efficiency of each main fan in the stable working area of each main fan according to the required air volume and the required air pressure which are required to be realized by each main fan, and searching the optimal required fan frequency in the curve library.
2. The on-demand variable frequency air conditioning system of mine multi-fan combined operation according to claim 1,
the downhole ventilation parameter monitoring subsystem (20) comprises:
the ventilation parameter monitoring module (21) is used for monitoring the wind speed values of a plurality of key wind-required tunnels in real time and obtaining the wind speed value of each tunnel by using the tunnel section value;
and the air demand calculation module (22) is used for monitoring the gas concentration values of carbon dioxide, carbon monoxide, methane and oxygen in the air of the key air demand lanes in real time, positioning the number of personnel and calculating the air demand of each key air demand lane.
3. A method for adjusting the wind of the frequency conversion on demand wind adjusting system operated by the combination of the mine multi-wind machine as claimed in any one of the claims 1 to 2, which is characterized by comprising the following steps:
s10: the ground main fan parameter monitoring subsystem (10) acquires working condition parameters of each main fan, the underground ventilation parameter monitoring subsystem (20) acquires ventilation parameters and air quantity demand of each key roadway, the fan air regulation sensitivity of branch air quantity is calculated in real time, and all data are uploaded to the ground monitoring center (40) for storage;
s20: the multi-fan on-demand optimal frequency conversion air-conditioning subsystem (30) utilizes data stored by a ground monitoring center (40) to fit a wind pressure curve equation of each fan, establishes a wind pressure characteristic curve equation of the current fan under different frequencies of 0-50Hz according to a main fan proportional law, stores the wind pressure characteristic curve equation into a fan curve library for searching, judges whether the difference value of the current wind volume and the required wind volume is within a threshold range in real time, and shifts to the previous step if the difference value is within the threshold range, otherwise performs corresponding wind volume regulation and control according to the position of a wind network where the required wind tunnel is located;
s30: calculating the required adjustment working condition of each fan by using a loop wind pressure analytic method, judging whether the required working condition parameters of each fan operate in a fan unstable area, if the working condition parameters operate in the fan unstable area, searching the required adjustment frequency in a fan curve library according to the required working condition of the fan, otherwise, rapidly alarming, uploading the analysis result to a ground monitoring center (40) to display a requester artificial decision, and simultaneously regulating and controlling the fan to the maximum wind volume value which ensures that the fan operates stably and is in a wind network safety state;
s40: bringing in wind network resolving software according to required adjusting frequency to simulate the working condition of each fan in advance, judging whether the wind volume of each tunnel exceeds the allowable range of the wind volume, if the wind volume exceeds the allowable range of the wind volume, alarming and uploading the analysis result to a ground monitoring center (40) to display and request manual decision, and meanwhile, regulating and controlling the fans to the maximum wind volume value which ensures that the fans run stably and are in a wind network safety state, otherwise, outputting the calculated regulation and control scheme to the ground monitoring center (40), and when a worker determines that no other safety risks exist, carrying out multi-fan remote frequency conversion regulation and control on demand quickly by one key.
4. The air regulating method of the frequency conversion on demand air regulating system operated by the mine multi-fan combination as claimed in claim 3,
in step S10, the method for calculating the fan air-conditioning sensitivity of the branch air volume includes the following steps:
aiming at the branch of the area where the fan belongs, when the fan air quantity Q f Variation Δ Q f When the wind is in the normal state, the wind volume change Δ Q of the branch i of the region to which the wind belongs i Amount of change Δ Q of air volume in branch i i And the amount of change delta Q of the fan air volume f The limit of the ratio is the wind adjusting sensitivity delta of the fan i The calculation formula is as follows:
5. the air adjusting method of the frequency conversion on demand air adjusting system operated by the mine multi-fan combination as claimed in claim 3,
in step S10, among the main fan operating condition parameters, the method for obtaining the fan air volume parameter includes the following steps:
when wind current flows in a pipeline with variable cross sections, the energy equation between two different cross sections can be obtained according to the Bernoulli equation:
in the formula: p 1 、P 2 Static pressure, pa, of the section 1 and the section 2; v. of 1 、v 2 The wind speeds of the section 1 and the section 2 are m/s; z is a linear or branched member 1 、Z 2 The elevation of the section 1 and the elevation of the section 2 are m, and the elevation of the two sections is the same for the fan; rho is wind current density, kg/m 3 (ii) a g is the acceleration of gravity, m/s 2 ；h 1-2 The resistance between two sections, pa, is negligible because the two sections are very close;
the expression of the air quantity and the air speed in the pipeline is as follows:
Q＝Sv
the formula for calculating the air volume based on the static pressure difference of different sections can be obtained by combining the two formulas as follows:
in the formula: s 1 、S 2 Is the cross-sectional area of section 1 and section 2, m 2 。
6. The air adjusting method of the frequency conversion on demand air adjusting system operated by the mine multi-fan combination as claimed in claim 3,
in step S20, the establishing of the wind pressure characteristic curve equation of the current fan at different frequencies from 0 to 50Hz includes the following steps:
the wind pressure characteristic equation of the current frequency of a certain fan is assumed as follows:
the wind pressure characteristic equation of any frequency is as follows:
order:
A i0 ＝A 00 K 1 ；A i1 ＝A 01 K 1 K 2 ；A i2 ＝A 02 K 1 K 2 2
in the formula: h f0 And H fi Respectively the wind pressure of a fan with the current frequency and the wind pressure of a fan with the ith frequency; q 0 And Q i Respectively the air volume of a fan with the current frequency and the air volume of a fan with the ith frequency; a. The 00 、A 01 、A 02 And A i0 、A i1 、A i2 Three parameters of a fan wind pressure characteristic equation of the current frequency and the ith frequency are set; and i is the number of the fan curves.
7. The air adjusting method of the frequency conversion on demand air adjusting system operated by the mine multi-fan combination as claimed in claim 3,
in step S20, performing corresponding air volume regulation according to the position of the air network where the air required passage is located includes:
if the air-required tunnel belongs to the area of the fan, the air quantity required and the air pressure required of the main fan of the fan area of the current key air-required tunnel are calculated by utilizing the air regulation sensitivity of the fan according to the air quantity value required to be regulated of the current key air-required tunnel, and the required fan working condition parameters of the fans are quickly calculated by utilizing a loop air pressure analytical method on the premise of ensuring the branch air quantity of the area of the other fan to be unchanged under the comprehensive consideration of the mutual influence of the fans by each main fan working condition calculation module (32);
if the required air channel belongs to the common branch area, the air quantity value is required to be adjusted to be the required increased air quantity value of all the fans, the required increased air quantity of each fan is obtained through calculation of an air quantity distribution basic rule, the required air pressure value can be obtained through calculation according to a loop air pressure analytic method, and further working condition parameter values required to be adjusted by each fan can be obtained.
8. The air adjusting method of the frequency conversion on demand air adjusting system operated by the mine multi-fan combination as claimed in claim 3,
in step S30, the loop wind pressure analysis method includes the steps of:
aiming at a ventilation network with a plurality of fans, the air quantity before each fan is regulated is assumed to be Q 1 ，Q 2 ，Q 3 …Q n (ii) a The wind pressure of the fan is H f1 ，H f2 ，H f3 …H fn (ii) a The adjusted wind pressure of the fan is H' f1 ，H′ f2 ，H′ f3 …H′ fn (ii) a The wind resistance of the region to which each fan belongs is R 1 ，R 2 ，R 3 …R n (ii) a The branch wind resistance of the common section is R 0 (ii) a The branch air quantity of the public section is Q 0 (ii) a The air quantity required to be increased by each fan is delta Q 1 ，ΔQ 2 ，ΔQ 3 …ΔQ n (ii) a Air volume change delta Q of public branch section 0 ＝ΔQ 1 +ΔQ 2 +ΔQ 3 +…+ΔQ n ；
Before regulation and control, a loop wind pressure equation is established for the fan 1:
before regulation and control, a loop wind pressure equation is established for the fan 2:
before regulation and control, a loop wind pressure equation is established for the fan 3:
……
before regulation and control, a loop wind pressure equation is established for the fan n:
the establishment of a loop wind pressure equation for the fan 1 after the regulation and control of the wind quantity of each fan comprises the following steps:
H′ f1 ＝R 1 (Q 1 +ΔQ 1 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
after regulation and control, the loop wind pressure equation is established for the fan 2 as follows:
H′ f2 ＝R 2 (Q 2 +ΔQ 2 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
after regulation and control, the loop wind pressure equation is established for the fan 3 as follows:
H′ f3 ＝R 3 (Q 3 +ΔQ 3 ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
……
after regulation and control, the loop wind pressure equation is established for the fan n as follows:
H′ fn ＝R n (Q n +ΔQ n ) 2 +R 0 (Q 0 +ΔQ 0 ) 2
the wind pressure required to be adjusted after the fan 1 is adjusted according to needs can be obtained by combining the above equations:
ΔH f1 ＝H′ f1 -H f1 ＝2R 1 Q 1 ΔQ 1 +R 1 ΔQ 1 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the wind pressure that needs to adjust after fan 2 adjusts as required does:
ΔH f2 ＝H′ f2 -H f2 ＝2R 2 Q 2 ΔQ 2 +R 2 ΔQ 2 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the wind pressure that needs to adjust after fan 3 adjusts as required does:
ΔH f3 ＝H′ f3 -H f3 ＝2R 3 Q 3 ΔQ 3 +R 3 ΔQ 3 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
……
the wind pressure required to be adjusted after the fan n is adjusted according to the requirement is as follows:
ΔH fn ＝H′ fn -H fn ＝2R n Q n ΔQ n +R n ΔQ n 2 +2R 0 Q 0 ΔQ 0 +R 0 ΔQ 0 2
the required operating condition of the fan 1 after the adjustment is (Q) 1 +ΔQ 1 ，H f1 +ΔH f1 ) The required operating condition of the fan 2 is (Q) 2 +ΔQ 2 ，H f2 +ΔH f2 ) The required operating condition of the fan 3 is (Q) 3 +ΔQ 3 ，H f3 +ΔH f3 ) 8230and the required working condition of fan n is (Q) n +ΔQ n ，H fn +ΔH fn )。
9. The air regulating method of the frequency conversion on demand air regulating system operated by the mine multi-fan combination as claimed in claim 3,
in step S30, searching for a required adjusting frequency in the fan curve library according to the required working condition of the fan includes:
and if the difference between the absolute value of the calculated wind pressure of the fan and the absolute value of the required wind pressure is found to be within the set precision range, outputting the frequency value of the current wind pressure curve equation, and calculating and outputting the required frequency values of other fans.
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