阅读说明：本技术 一种实现矿井多时段需风量调节的变频节能计算方法 (Variable-frequency energy-saving calculation method for realizing multi-period air quantity regulation of mine ) 是由 许志逞 于 2020-04-21 设计创作，主要内容包括：本发明涉及一种实现矿井多时段需风量调节的变频节能计算方法,通过变频计算方法调节矿井多中段多时段需风量,提供一种方便快捷、节能降耗、实用性强的能满足多中段多时段通风需求的通风方法。(The invention relates to a variable-frequency energy-saving calculation method for realizing multi-period air demand regulation of a mine, which regulates multi-period air demand of multiple middle sections of the mine through a variable-frequency calculation method, and provides a ventilation method which is convenient and rapid, saves energy, reduces consumption and has strong practicability and can meet the ventilation requirement of multiple middle sections and multiple periods.)

1. A frequency conversion energy-saving calculation method for realizing mine multi-time-interval air quantity regulation is characterized by comprising the following steps:

step 1: a plurality of main ventilators are respectively arranged at the air inlet shaft and the air return shaft, and generally 4-8 main ventilators are respectively arranged; the earth surface is provided with a PLC remote control system;

step 2: according to a production schedule of each quarter of a mine, counting the quantity and working face parameters of each middle-section mining, rock drilling, tunneling working face, various chambers, and respectively calculating the maximum air demand of various working faces and chambers according to the dust exhaust air speed of the working faces;

and step 3: mine production operation time is divided into three time intervals of early, middle and late, the quantity of mining, rock drilling, tunneling and other working faces at the same time is respectively counted in three time intervals,

and 4, step 4: an air quantity sensor is arranged on each main ventilator return air roadway, and the full-frequency F of each main ventilator is monitored on line through a PLC remote control system_{Is full of}(frequency 50)Hz) operation return air quantity Q_{Wind power}Total return air quantity Q of 8 main ventilators in the fan station_{General assembly}The formula is as follows: q_{General assembly}＝Σq_{Wind power}；

And 5: referring to the relationship among frequency, rotating speed and air volume in hydrodynamics and electromechanics theory, determining that the air volume has a first order relation with the motor frequency, and adopting the formula: q₁/Q₂＝F₁/F₂。

In the formula: f₁、F₂-fan operating frequency, Hz;

Q₁、Q₂-fan running air quantity m³/s；

Step 6: operating the main ventilator at full frequency according to the relation of the air volume and the motor frequency in a linear mode_{General assembly}Three-time-interval air quantity Q required by each mine_{Need to}And the full frequency F of the motor_{Is full of}Substituting to obtain the actual required operating frequency F of each main ventilator in three time periods_{Need to}；

And 7: the frequency control of each main ventilator is mainly realized through a PLC remote control system, the frequency is calculated according to the formula to carry out remote frequency modulation on the main ventilator, the return air volume after frequency conversion is obtained through an air volume sensor arranged on a return air roadway, and the total air volume Q of the main ventilator after frequency conversion_{General assembly}The total wind quantity Q after frequency conversion_{General assembly}The total air quantity Q of the mine in three time periods_{Need to}Checking to confirm the difference between the air quantity and the air quantity, wherein the ratio of the difference between the air quantity and the air quantity is within 5% of the air quantity required in each time interval.

2. The variable-frequency energy-saving calculation method for realizing mine multi-period air demand regulation according to claim 1, characterized in that the step 3: grouping the mine production operation time according to three time periods of morning, middle and evening, respectively counting the quantity of mining, rock drilling, tunneling and other working faces at the same time in three time periods, giving a certain air leakage coefficient according to the sum of the maximum air demand of each working face and the air volume of the chamber needing independent ventilation, and calculating the air demand Q of each mine in three time periods_{Need to}The formula is as follows: q_{Need to}＝k(Σn_Miningq_Mining+Σn_Chiselq_Chisel+Σn_{Digging machine}q_{Digging machine}+Σn_{Underground cave}q_{Underground cave}+Σn_Othersq_Others)；

In the formula: k is the air leakage coefficient of the mine, and the value range is 1.20-1.45;

n_mining-number of mining faces working simultaneously;

q_miningCalculated air volume, m, of the mining face³/s；

n_Chisel-number of rock drilling faces working simultaneously;

q_chiselCalculated air quantity of rock drilling face, m³/s；

n_{Digging machine}-number of driving faces working simultaneously;

q_{digging machine}Calculated air quantity m of the driving face³/s；

n_{Underground cave}The number of certain types of chambers mainly refers to an explosive warehouse, a crushing chamber and the like;

q_{underground cave}Calculated air volume, m, of a certain type of chamber³/s；

n_OthersThe number of other wind-requiring points of a certain type comprises loading and unloading mine points of a main shaft, a spray anchor support working surface and the like, and wind supply is considered under specific conditions;

q_othersCalculated air volume m of other wind points of a certain type³/s。

3. The variable-frequency energy-saving calculation method for realizing mine multi-period air demand regulation according to claim 2, characterized in that in the step 3: k is the mine air leakage coefficient, and the value range is 1.20-1.45.

4. The variable-frequency energy-saving calculation method for realizing mine multi-period air demand regulation according to claim 3, characterized in that the step 6: operating the main ventilator at full frequency according to the relation of the air volume and the motor frequency in a linear mode_{General assembly}Three-time-interval air quantity Q required by each mine_{Need to}And the full frequency F of the motor_{Is full of}Substituting to obtain the actual required operating frequency F of each main ventilator in three time periods_{Need to}。

F_{Need to}＝[F_{Is full of}×k(Σn_Miningq_Mining+Σn_Chiselq_Chisel+Σn_{Digging machine}q_{Digging machine}+Σn_{Underground cave}q_{Underground cave}+Σn_Othersq_Others)]/Σq_{Wind power}In the formula: k is the air leakage coefficient of the mine, and the value range is 1.20-1.45;

n_mining-number of mining faces working simultaneously;

q_miningCalculated air volume, m, of the mining face³/s；

n_Chisel-number of rock drilling faces working simultaneously;

q_chiselCalculated air quantity of rock drilling face, m³/s；

n_{Digging machine}-number of driving faces working simultaneously;

q_{digging machine}Calculated air quantity m of the driving face³/s；

n_{Underground cave}The number of certain types of chambers mainly refers to an explosive warehouse, a crushing chamber and the like;

q_{underground cave}Calculated air volume, m, of a certain type of chamber³/s；

n_OthersThe number of other wind-requiring points of a certain type comprises loading and unloading mine points of a main shaft, a spray anchor support working surface and the like, and wind supply is considered under specific conditions;

q_othersCalculated air volume m of other wind points of a certain type³/s；

q_{Wind power}Main ventilator full frequency operation air quantity m³/s；

F_{Is full of}-the main ventilator full frequency operating frequency, 50 Hz.

Technical Field

The invention relates to frequency conversion energy-saving calculation, in particular to a frequency conversion energy-saving calculation method for realizing multi-period air demand regulation of a mine, and belongs to the technical field of multi-period air demand regulation of the mine.

Background

The design production capacity of the meishan iron ore is 400 ten thousand t/a, -318m, -330m, -348m and-366 m multi-middle-section stoping, and the maximum air demand of the mine design is 554m³And s. A ventilation system I is provided with 3 110kW and 4 200kW main ventilators in a grading fan station, and an IV-grade return fan station is provided with 8 200kW main ventilators. The underground production of the Meishan iron ore is operated in three working periods of morning, noon and evening, the quantity and the workload of working surfaces of each working period are changed, and the air quantity difference of the three working periods is calculated according to the dust exhaust air quantity of a ventilation system. The total installed capacity of the ventilation system is 2730kW, the full-load operation power consumption of the main ventilator all day reaches 1940.76kW, and the annual ventilation cost reaches up to 1445.09 ten thousand yuan. The main ventilator is operated at full load in a time period with less air quantity demand, so that the excessive waste of ventilation energy consumption is caused, and the effects of ventilation, energy conservation and emission reduction are not achieved. Therefore, it is urgentA new solution is needed to solve the above technical problems.

Disclosure of Invention

The invention provides a variable-frequency energy-saving calculation method for realizing the multi-period air demand regulation of a mine aiming at the problems in the prior art. The complicated adjusting mode of adjusting the air quantity of the main ventilator by the frequency of 1Hz is simplified, the problems of air quantity waste, ventilation energy consumption waste and the like caused by full-frequency operation of a mine ventilation system are solved, and the annual ventilation energy consumption cost of the ventilation system is reduced.

In order to achieve the purpose, the technical scheme of the invention is that a variable-frequency energy-saving calculation method for realizing the multi-period air quantity regulation of a mine comprises the following steps:

step 1: a plurality of main ventilators are respectively arranged at the air inlet shaft and the air return shaft; the earth surface is provided with a PLC remote control system;

step 2: according to a production schedule of each quarter of a mine, counting the quantity and working face parameters of each middle-section mining, rock drilling, tunneling working face, various chambers, and respectively calculating the maximum air demand of various working faces and chambers according to the dust exhaust air speed of the working faces;

and step 3: grouping the mine production operation time according to three time periods of morning, middle and evening, respectively counting the quantity of mining, rock drilling, tunneling and other working faces at the same time in three time periods, giving a certain air leakage coefficient according to the sum of the maximum air demand of each working face and the air volume of the chamber needing independent ventilation, and calculating the air demand Q of each mine in three time periods_{Need to}The formula is as follows: q_{Need to}＝k(Σn_Miningq_Mining+Σn_Chiselq_Chisel+Σn_{Digging machine}q_{Digging machine}+Σn_{Underground cave}q_{Underground cave}+Σn_Othersq_Others)。

In the formula: k is the air leakage coefficient of the mine, and the value range is 1.20-1.45;

n_mining-number of mining faces working simultaneously;

q_miningCalculated air volume, m, of the mining face³/s；

n_Chisel-number of rock drilling faces working simultaneously;

q_chiselCalculated air quantity of rock drilling face, m³/s；

n_{Digging machine}-number of driving faces working simultaneously;

q_{digging machine}Calculated air quantity m of the driving face³/s；

n_{Underground cave}The number of certain types of chambers mainly refers to an explosive warehouse, a crushing chamber and the like;

q_{underground cave}Calculated air volume, m, of a certain type of chamber³/s；

n_OthersThe number of other wind-requiring points of a certain type comprises loading and unloading mine points of a main shaft, a spray anchor support working surface and the like, and wind supply is considered under specific conditions;

q_othersCalculated air volume m of other wind points of a certain type³/s。

And 4, step 4: an air quantity sensor is arranged on each main ventilator return air roadway, and the full-frequency F of each main ventilator is monitored on line through a PLC remote control system_{Is full of}Return air quantity Q in operation (frequency 50Hz)_{Wind power}Total return air quantity Q of 8 main ventilators in the fan station_{General assembly}The formula is as follows: q_{General assembly}＝Σq_{Wind power}。

And 5: referring to the relationship among frequency, rotating speed and air volume in hydrodynamics and electromechanics theory, determining that the air volume has a first order relation with the motor frequency, and adopting the formula: q₁/Q₂＝F₁/F₂。

In the formula: f₁、F₂-fan operating frequency, Hz;

Q₁、Q₂-fan running air quantity m³/s。

Step 6: operating the main ventilator at full frequency according to the relation of the air volume and the motor frequency in a linear mode_{General assembly}Three-time-interval air quantity Q required by each mine_{Need to}And the full frequency F of the motor_{Is full of}Substituting to obtain the main points of three time periodsActual required operating frequency F of ventilator_{Need to}。

F_{Need to}＝[F_{Is full of}×k(Σn_Miningq_Mining+Σn_Chiselq_Chisel+Σn_{Digging machine}q_{Digging machine}+Σn_{Underground cave}q_{Underground cave}+Σn_Othersq_Others)]/Σq_{Wind power}In the formula: k is the air leakage coefficient of the mine, and the value range is 1.20-1.45;

n_mining-number of mining faces working simultaneously;

q_miningCalculated air volume, m, of the mining face³/s；

n_Chisel-number of rock drilling faces working simultaneously;

q_chiselCalculated air quantity of rock drilling face, m³/s；

n_{Digging machine}-number of driving faces working simultaneously;

q_{digging machine}Calculated air quantity m of the driving face³/s；

n_{Underground cave}The number of certain types of chambers mainly refers to an explosive warehouse, a crushing chamber and the like;

q_{underground cave}Calculated air volume, m, of a certain type of chamber³/s；

n_OthersThe number of other wind-requiring points of a certain type comprises loading and unloading mine points of a main shaft, a spray anchor support working surface and the like, and wind supply is considered under specific conditions;

q_othersCalculated air volume m of other wind points of a certain type³/s；

q_{Wind power}Main ventilator full frequency operation air quantity m³/s；

F_{Is full of}-the main ventilator full frequency operating frequency, 50 Hz.

And 7: the frequency control of each main ventilator is mainly realized through a PLC remote control system, the frequency is calculated according to the formula to carry out remote frequency modulation on the main ventilator, the return air volume after frequency conversion is obtained through an air volume sensor arranged on a return air roadway, and the total air volume Q of the main ventilator after frequency conversion_{General assembly}The total wind quantity Q after frequency conversion_{General assembly}The total air quantity Q of the mine in three time periods_{Need to}Checking to confirm the difference between the air quantity and the air quantity, wherein the ratio of the difference between the air quantity and the air quantity is within 5% of the air quantity required in each time interval.

Compared with the prior art, the ventilation system has the advantages that the ventilation system of the technical scheme performs variable-frequency ventilation in three time intervals, all the main ventilators run at less than full load for 24 hours, and on the basis of meeting the ventilation requirements of mine in all time intervals, the cost of the ventilators can be reduced by 386.59 ten thousand yuan/year through variable-frequency energy-saving air volume regulation; according to the scheme, the remote frequency modulation of the main ventilator is realized through the PLC remote control system, the management difficulty of the main ventilator is reduced, and the cost of ventilator managers and resources is expected to be saved by 35.32 ten thousand yuan/year. The ventilation system performs ventilation in three time intervals, and the time intervals are reasonably divided according to a mine production plan to calculate the ventilation air quantity, so that the waste of air quantity and energy consumption during ventilation according to the maximum air quantity requirement in the production process is avoided; the complicated adjusting method of adjusting the air quantity of the main ventilator by the amplitude of 1Hz is simplified, and the actually required frequency of the air quantity required in each time period can be directly, quickly and effectively calculated through a formula; the technology of reducing the rotating speed by accurately modulating the frequency of the frequency converter provides theoretical knowledge for field ventilation technicians to adjust the air quantity, and reduces the management difficulty of a ventilation system; the multi-period on-demand ventilation starts from the theory of supply and demand balance of mine air volume, and the air volume is reasonably arranged according to different air volume demands of various periods of a mine for ventilation, so that the precedent of time-period ventilation of a ventilation system is realized, and an effective thought is provided for intelligent ventilation.

Drawings

FIG. 1 is a schematic view of a work surface and a ventilation system according to an embodiment of the present invention.

In the figure: 1-a mining face; 2-a rock drilling working face; 3-tunneling a working face; 4-other working faces; 5-chamber; 6-return air tunnel; 7-air volume sensor; 8-a main ventilator; 9-a remote control system; 10-south air intake shaft; 11-north air intake; 12-east return air shaft; 13-west return air shaft.

The specific implementation mode is as follows:

for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.

Example 1: referring to fig. 1, fig. 1 is a working surface and a schematic diagram of a ventilation system of the variable frequency energy-saving calculation method for realizing the adjustment of the air quantity required by a mine in multiple periods, and the system generally presents a ' south air inlet, north air inlet, east air return ' and west air return ' structure, namely, the south air inlet shaft (10) and the north air inlet shaft (11) are used for air inlet, the east air return shaft (12) and the west air return shaft (13) are used for air return, the south air inlet horizontal shaft stone door and the north air inlet shaft stone door are provided with 7 main ventilators (8), the east air return shaft stone door and the west air return shaft stone door are provided with 8 main ventilators (8), and the earth surface is provided with a PLC remote control system.

Collecting working face parameters of each middle section according to a production schedule of each quarter of a mine, respectively calculating the maximum air volume demand of various working faces and chambers (5) according to the dust exhaust air speed of the working faces, grouping the production operation time of the mine according to three periods of early, middle and late, respectively counting the quantity of mining working faces (1), rock drilling working faces (2), driving working faces (3) and other working faces (4) at the same time in three periods, respectively calculating the sum of the maximum air volume demand of various working faces and the air volume demand of chambers (5) needing independent ventilation according to certain air leakage coefficients, and respectively calculating the air volume demand Q in three periods of the mine_{Need to}. According to the collected data and the parameters, the required air volume of the mine in three time periods is calculated to be 430.78m respectively³/s、460.89m³S and 539.53m³/s。

Each main ventilator (8) air return roadway (6) is provided with an air quantity sensor (7), and each main ventilator (8) full-frequency F is monitored on line through a PLC (programmable logic controller) remote control system (9)_{Is full of}Return air quantity Q during operation_{Wind power}Total return air quantity Q of 8 main ventilators (8) in the fan station_{General assembly}Is 575.70m³/s。

Determining that the air volume has a primary square relation with the motor frequency according to the relation among the frequency, the rotating speed and the air volume in the theory of hydrodynamics and electromechanics, and operating 15 main ventilators (8) at full frequency to obtain the total air volume Q_{General assembly}Three-time-interval air quantity Q required by each mine_{Need to}And the full frequency F of the motor_{Is full of}Substituting into the relational expression of the air quantity and the motor frequency, and calculating to obtain the actual required operating frequency F of each main ventilator (8) meeting the air quantity requirement of the mine in three time periods_{Need to}。

F_{Need to}＝[F_{Is full of}×k(Σn_Miningq_Mining+Σn_Chiselq_Chisel+Σn_{Digging machine}q_{Digging machine}+Σn_{Underground cave}q_{Underground cave}+Σn_Othersq_Others)]/Σq_{Wind power}In the formula: k is the mine air leakage coefficient;

n_mining-number of mining faces working simultaneously;

q_miningCalculated air volume, m, of the mining face³/s；

n_Chisel-number of rock drilling faces working simultaneously;

q_chiselCalculated air quantity of rock drilling face, m³/s；

n_{Digging machine}-number of driving faces working simultaneously;

q_{digging machine}Calculated air quantity m of the driving face³/s；

n_{Underground cave}The number of certain types of chambers mainly refers to an explosive warehouse, a crushing chamber and the like;

q_{underground cave}Calculated air volume, m, of a certain type of chamber³/s；

n_OthersThe number of other wind-requiring points of a certain type comprises loading and unloading mine points of a main shaft, a spray anchor support working surface and the like, and wind supply is considered under specific conditions;

q_othersCalculated air volume m of other wind points of a certain type³/s；

q_{Wind power}Main ventilator full frequency operation air quantity m³/s；

F_{Is full of}-the main ventilator full frequency operating frequency, 50 Hz.

According to a frequency conversion calculation formula, the operation frequencies of the main ventilator corresponding to the air demand of the Metronite ventilation system in three periods are respectively 38Hz, 41Hz and 47 Hz.

The frequency control of each main ventilator (8) is mainly realized through a PLC remote control system (9), the frequency is calculated according to the formula to remotely modulate the frequency of 15 main ventilators, the return air volume after frequency conversion is obtained through an air volume sensor (7) arranged on a return air roadway (6), and the total air volume Q after frequency conversion of 8 main ventilators (8) is summed_{General assembly}Are respectively 436.57m³/s、470.12m³S and 542.58m³S, total wind quantity Q after frequency conversion_{General assembly}The required air quantity Q of the mine in three time periods_{Need to}And checking to meet the actual air quantity requirement of the mine. The Meishan iron ore ventilation system divides three time periods for ventilation, calculates the sum of air demands of mining, rock drilling, tunneling, other working surfaces and various chambers at the same time according to the three time periods, gives a certain air leakage coefficient, and calculates the air demands of mines in the three time periods. And determining that the primary relation exists between the air volume and the motor frequency by referring to the relation among the frequency, the rotating speed and the air volume in the fluid mechanics and electromechanical theory. And calculating the actual required operating frequency of each main ventilator meeting the air demand of the mine in three periods according to a calculation formula of frequency and air quantity, and performing remote control adjustment through a PLC (programmable logic controller) remote control system according to the calculated frequency to meet the air demand of the mine in three periods.

It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.