Graduation comprehensive training report
Topic: Mine ventilation design
Specialized course: High Ore Point 083 1
Designer: Ren
Guide: Liu Wennuan
2011May 27th
Liaoyuan vocational and technical college
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catalogue
I. Contents and requirements of mine ventilation design 5
(1) Ventilation during mine capital construction 5
(2) Ventilation during mine production 5
(3) The content of mine ventilation design 6
(4) Mine ventilation design requirements 7
Second, the optimization of mine ventilation system 7
(a) the requirements of mine ventilation system 7
(2) Determine the mine ventilation system 8
Three, the mine air volume calculation 8
(a) mine air volume calculation principle 8
(2) Calculation of Mine Air Demand 8
Calculation of air demand in 1.8 coal mining face
2. 1 1 calculation of air volume required for heading face
3. 13 calculation of air demand in cavern
4. Air demand computer for other air ducts 14
Four, the total resistance of mine airflow is calculated as 15.
(a) the calculation principle of mine airflow total resistance 15
(2) Calculation of total airflow resistance in mine 15
Five, the choice of mine ventilation equipment 16
(a) the choice of main ventilator 17
Six, estimate the mine ventilation cost 2 1
order
Ventilation is an important link related to coal mine safety production. In order to ensure the stability and reliability of ventilation system, with the change of mine production, the ventilation system must be reformed and coordinated immediately, the series ventilation should be strictly controlled, the local ventilation management should be strengthened, and the unplanned power failure of local fans should be put an end to make the ventilation system normal, reasonable, reliable and stable.
Mine ventilation design is an important part of the whole mine design content and an important link to ensure safe production. Therefore, it must be carefully thought out and carefully designed to achieve the expected results.
Chapter I Contents and Requirements of Mine Ventilation Design
The basic task of mine ventilation design is to establish an advanced, economical, reasonable, safe and reliable mine ventilation system. Mine ventilation design is divided into new or expanded mine ventilation design. For the ventilation design of new mines, we should consider both the current needs and the possibility of long-term development. For the ventilation design of the reconstruction and expansion mine, it is necessary to conduct a detailed investigation on the original production and ventilation situation of the mine, analyze the existing problems of ventilation, consider the characteristics and development planning of mine production, make full use of the original mine roadway and ventilation equipment, and put forward a more perfect and practical ventilation design on the original basis. No matter how to build, rebuild or expand mine ventilation design, we must implement the Party's technical and economic policies and follow the mine safety regulations, technical regulations, design specifications and relevant regulations promulgated by the state.
Mine ventilation design is generally divided into two periods: capital construction period and production period, which are designed and calculated respectively.
The first section during the capital construction of mine ventilation
Ventilation during the period of mine capital construction refers to the ventilation during shaft excavation, that is, the ventilation during shaft sinking (or adit), bottom, underground cavity, the first horizontal transportation roadway and ventilation roadway. During this period, a local ventilator is used to ventilate the single-ended roadway. When the two shafts are connected and the main fan is installed, the main fan can be used for full-pressure ventilation of the excavated shaft, thus shortening the distance between the rest of the shaft and the local ventilation during excavation of the cavern.
Ventilation during mine production in the second quarter
Ventilation in mine production period refers to the ventilation after the whole mine is put into production, including the ventilation of the whole mine development, precision mining and coal mining face and other wells. Ventilation design in this period can be divided into two situations according to the length of mine production years:
(1) When the mine service life is not long (about 15 to 20 years), the ventilation design is only done once. The minimum ventilation resistance after mine production is the easy period of mine ventilation; Difficult times are the times when the mine ventilation resistance is the greatest. According to the production situation in these two periods, the design and calculation are carried out, and the ventilation in these two periods is selected as the appropriate ventilation equipment.
(2) When the service life of the mine is long, considering the selection of ventilator equipment, the change of air volume and wind pressure required by the mine and other factors, the ventilation design should be carried out in two phases. The first stage is the first stage, and the detailed design and calculation are carried out for the two situations of easy ventilation and difficult ventilation in this stage. The ventilation design of the second phase is only planned in general principle, but the mine ventilation system should be comprehensively considered according to the technical and economic factors of the whole production period of the mine, so that the determined ventilation system can not only meet the requirements of actual production, but also take care of the long-term production development and changes.
The basic data required for mine ventilation design are as follows:
Mine topographic and geological map; Contents of free silica (silicon), sulfur, radioactive substances, gases and harmful gases in ores and rocks; Spontaneous combustion tendency of coal and rock; Coal dust explosiveness; Climatic conditions of the mining area, including annual maximum, minimum, average temperature, ground temperature, geothermal deepening rate and perennial dominant wind direction; Bulk density, crushing degree, loose coefficient, silt content and cohesiveness of ores and rocks; Whether there is an old kiln lane in the mining area and its location and existence; The annual output, service life, development system, mining sequence and mining method of the mine; Output distribution and job layout, as well as the number of working faces and the number of spare working faces; The number and distribution of various types of rock drills operated at the same time; Maximum charge for simultaneous blasting; Maximum number of people working at the same time, etc.
In the third quarter, the content of mine ventilation design
(1) determine the mine ventilation system
(2) Mine ventilation calculation and air volume distribution
(3) Calculation of mine ventilation resistance
(4) Select ventilation equipment
(5) estimate the mine ventilation cost
In addition, according to the special situation of different regions or mines, it is necessary to be alert to the calculation of mine air temperature regulation (see Chapter 8 for details).
The fourth quarter mine ventilation design requirements
(1) Effectively deliver enough fresh air to the underground workplace to ensure production and create good working conditions;
(2) The ventilation system is simple, the airflow is stable, it is easy to manage and has the ability to resist disasters;
(3) When an accident occurs, the airflow is easy to control and the personnel are easy to evacuate;
(four) there are underground environment and safety testing systems or testing measures that meet the requirements;
(5) The ventilation system has low investment, low operation cost and good comprehensive economic benefits.
Chapter II Optimization of Mine Ventilation System
The first section requirements of mine ventilation system
(1) Each mine must have a complete independent ventilation system.
(2) The air inlet wellhead shall be arranged in a place free of dust, coal dust, dust, harmful gas and high temperature gas according to the annual wind direction frequency.
(3) skip hoisting shaft or shaft equipped with belt conveyor should not be used as air intake shaft. If it is used as an air intake shaft, measures must be taken to meet the safety requirements.
(4) Multi-fan ventilation system, under the premise of meeting the demand of air distribution, the working air pressure of each main fan should be close. When the air pressure difference between the fans is large, the air pressure of the air duct should be reduced so that it does not exceed 30% of the air pressure of any fan.
(5) Each production level and each mining area must be decorated with return air lanes, and partition ventilation shall be implemented.
(6) Underground blasting equipment warehouse must have a separate fresh air flow, and the return air flow must be directly introduced into the mine total return air lane or main return air lane.
(7) The underground charging room must be ventilated by separate fresh air flow, and the return air flow should be introduced into the return air lane.
Determination of mine ventilation system in the second quarter
According to mine gas emission, mine design production capacity, coal seam occurrence conditions, topsoil thickness, mine field area, ground temperature, spontaneous combustion tendency of coal seam and considering the production needs in the middle and later period, several technically feasible schemes are put forward, and the mine ventilation system is determined through optimization or technical and economic comparison. Mine ventilation system should have strong disaster resistance. When a catastrophic accident occurs underground, the selected ventilation system can minimize the disaster and quickly resume normal production.
Chapter III Calculation of Mine Air Volume
The first section mine air volume calculation principle
The mine air demand is calculated according to the following requirements, and the maximum value is taken.
(1) According to the maximum number of people working at the same time underground, the air volume per person per minute shall not be less than 4m? ;
(2) According to the actual needs of coal mining, tunneling and cavern, the sum of the required air volume is calculated.
In the second quarter, the calculation of mine air demand
1. Calculation of required air volume in coal mining face
The air volume of coal mining face should be calculated according to the following factors to obtain the maximum value.
1) is calculated according to gas emission.
Qwi= 100 Qgwi Kgwi
Type, qwi-I coal mining face required air volume, m .. /minute
Qgwi-absolute gas emission from the I-th coal mining face, m? /minute
KGWI—— the spare air volume coefficient generated by uneven gas emission in the ith coal mining face, which is the ratio of the maximum absolute gas emission to the average absolute gas emission in this working face. Production mines can be observed for at least 5 days and nights according to the normal production conditions of each working face, and 5 ratios are obtained, and the maximum value is taken. Generally, the mechanized mining face takes kgwi =1.2 ~1.6; The blasting face is kgwi =1.4 ~ 2.0; KGWI = 2.0 ~ 3.0 is taken for water mining face.
2) according to the working face into the air temperature calculation
The coal mining face should have good climatic conditions. The inlet air temperature can be calculated according to the air temperature prediction method. Its temperature and wind speed shall meet the requirements of Table 7-4- 1.
Table 7-4- 1 Corresponding Table of Air Temperature and Wind Speed in Coal Mining Face
Air inlet temperature of coal mining face /℃s- 1
& lt 15
15~ 18
18~20
20~23
23~26 0.3~0.5
0.5~0.8
0.8~ 1.0
1.0~ 1.5
1.5~ 1.8
Calculation of required air volume in coal mining face;
Qwi=60 Vwi Swi Kwi
Where, vwi-the wind speed of the ith coal mining face, selected from Table 7-4- 1 according to its inlet air temperature, m/s;
Swi—— the effective ventilation section of the ith coal mining face, taking the average value of the effective section at the time of maximum and minimum roof control, m2.
Kwi-the length coefficient of the ith working face, which can be selected according to Table 7-4-2.
Table 7-4-2 Coal Mining Face Length Air Coefficient Table
Coal mining face length/meter working face length air volume coefficient Kwi
& lt 15
50~80
80~ 120
120~ 150
150~ 180
& gt 180 0.8
0.9
1.0
1. 1
1.2
1.30~ 1.40
3) According to the explosive dosage.
Qwi=25×Awi
Where 25 is the gas supply per use of 1kg explosive, m3/min；; ;
Awi—— the maximum explosive quantity of the first blasting in the ith working face, kg;
4) according to the number of people.
Qwi=4×nwi
Where 4 is the minimum air volume that should be supplied per person per minute, m3/min；; ;
NWI-the maximum number of people working at the I-th coal mining face at the same time, 1 person.
5) Check according to the wind speed.
Check the minimum air volume of each coal mining face according to the minimum wind speed:
Qwi≥60×0.25×Swi
According to the highest wind speed, calculate the maximum air volume of each coal mining face:
Qwi≤60×0.25×Swi
When there is series ventilation in the coal mining face, it is calculated according to one of the maximum air demand. The standby working face should also meet the above requirements, and meet the requirements of gas, carbon dioxide, airflow temperature, wind speed and other requirements to calculate the required air volume, and shall not be less than 50% of the required air volume during mining.
2. Calculation of the required air volume of the heading face
The air volume of coal roadway, semi-coal rock roadway and rock roadway driving face should be calculated according to the following factors, and the maximum value should be taken.
1) is calculated according to gas emission.
Qhi= 100×Qghi×Kghi
Type, qhi-I the required air volume of tunneling faces, m3/min；; ;
Qghi—— the absolute gas emission of the ith tunneling face, m3/min；; ;
Kghi—— Uneven gas emission and standby air volume coefficient of the ith heading face, generally taken as 1.5 ~ 2.0.
2) According to the amount of explosives.
Qhi=25×Ahi
Where 25 is the air supply volume of 1kg explosive, m3/min；; ;
Ahi—— the maximum explosive quantity of the first blasting in the ith heading face, kg.
3) according to the local fan suction air volume calculation.
Qhi= ∑Qhfi×Khfi
Where ∑ qhfi is the sum of rated air volume of local ventilator running at the same time in the ith heading face. The rated air volume of various ventilators can be selected according to Table 7-4-3.
Khfi—— the air volume reserve coefficient to prevent the local ventilator from absorbing circulating air, which is generally 1.2 ~ 1.3. Take 1.2 when there is no gas emission in the air inlet roadway, and 1.3 when there is gas emission.
Table 7-4-3 Rated air volume of various local ventilators
Fan model rated air volume /m3? Minimum-1
Jbt-51(5.5kW)
JBT-52( 1 1 kw)
JBT-6 1( 14KW)
JBT-62 (28kW) 150
200
250
300
4) according to the number of people.
Qhi=4×nhi
Where NHI-the maximum number of people working at the i-th tunneling face at the same time, people.
5) Check according to the wind speed.
According to the minimum wind speed calculation, the minimum air volume of each rock roadway desperate working face:
Qhi≥ 60×0. 15×Shi
Minimum air volume of driving face in each coal lane or semi-coal lane:
Qhi≥ 60×0.25×Sdi
According to the maximum wind speed calculation, the maximum air volume of each heading face:
qhi≤60×4× 10
Where, Shi—— the net sectional area of the roadway in the ith heading face, m2.
3. Calculation of required air volume of cavern
The air supply volume of each independent ventilation cavern shall be calculated according to different cavern types:
1) electromechanical cavern
Mechanical and electrical cavern with large calorific value should be calculated separately according to the calorific value of mechanical and electrical equipment running in the cavern;
Qri= 3600×∑N×θ
ρ×CP×60×δt
Type, qhi-I mechanical and electrical cavern required air volume, m3/min；; ;
∑n—— total power of motor (transformer) running in electromechanical room, kW;
θ —— the heating coefficient of the electromechanical room, which can be determined by converting the actual heat of mechanical equipment in the electromechanical room into the coefficient equivalent to the useless capacity of electrical equipment according to the actual investigation, or selected according to Table 7-4-4;
ρ-air density, generally1.2kg/m3; ;
Cp-specific heat capacity of air at constant pressure, generally 1kJ/(kg? k)；
Δ t —— Temperature difference between inlet and return air of electromechanical room,℃.
Table 7-4-4 Electrical and Mechanical Room Heating Coefficient (θ) Table
Name of electromechanical room heating coefficient
Air compressor room 0.20 ~ 0.23
Pump house 0.0 1 ~ 0.03
Substation and winch room 0.02 ~ 0.04
Mining area substation and substation cavern, according to the experience value to determine the required air volume:
QRI = 60 ~ 80m3/min
2) Blasting material warehouse
Qri=4×V/60
Where v is the warehouse volume, m3.
However, the warehouse of large-scale blasting equipment should not be less than 100 m3/min, and the warehouse of small and medium-sized blasting equipment should not be less than 60 m3/min.
3) Charging cavern
It shows that the hydrogen concentration in the return air flow is less than 0.5%.
Qri=200×qrhi
Where qrhi is the amount of hydrogen produced by the I-th hydrogen charging hole in the process of hydrogen charging, m3/min.
4. Other air demand computers for wind tunnels.
The air demand of other roadways should be calculated according to the gas emission and wind speed, and the maximum value should be taken.
1) is calculated according to gas emission.
Qoi= 133×Qgoi×kgoi
Type, qgoi-I other wind tunnel absolute gas emission, m3/min；; ;
Koi —— the air volume reserve coefficient in Article I when the gas emission in other wind tunnels is uneven, generally kgoi= 1.2~ 1.3.
2) Check according to the lowest wind speed.
Qoi≥ 60×0. 15×Soi
Where Soi—— refers to the net sectional area of other roadways in Article I, m2.
5. Calculation of total air volume in mine
The total air intake of the mine should be calculated according to the sum of the actual air demand in coal mining, tunneling, cavern and other places:
Qm=(∑Qwt+∑Qht+∑Qrt+∑Qot)×km
Where ∑ QWT is the sum of the air volume required by the coal mining face and the standby face, m3/min；; ;
∑Qht—— the sum of the required air volume of the heading face, m3/min；; ;
∑Qrt—— the sum of the required air volume of the cavern, m3/min；; ;
∑ Qot-sum of air volume required by other wind measuring points, m3/min.
Km—— ventilation coefficient of the mine (including air leakage and uneven air distribution in the mine), which can be taken as 1. 15~ 1.25.
The fourth chapter mine airflow total resistance calculation
The first section of mine airflow total resistance calculation principle
(1) The total resistance of mine airflow should not exceed 2940pa.
(2) The local resistance of mine roadway, the new mine (including the expansion area for expanding mine independent ventilation) shall be calculated as 10% of the friction resistance of mine roadway, and the expansion mine shall be calculated as 15% of the friction resistance of mine roadway.
In the second quarter, the total resistance calculation of mine airflow
The total resistance of mine airflow refers to the sum of friction resistance and local resistance of each branch on a path (airflow route) from the inlet wellhead to the return wellhead, which is referred to as the total resistance of mine for short and expressed by hm.
For the mine with two or more main ventilators working, the mine ventilation resistance should be calculated respectively according to the system served by each main ventilator.
During the service life of main ventilators, the total resistance of ventilation system will also change with the change of coal mining face and the replacement of mining area. In order to make the main ventilator meet the needs in the whole service period and have high operating efficiency, it is necessary to analyze the changes of the total resistance of the system in different periods during the service period of the main ventilator according to the development and mining layout and the replacement arrangement of the mining face. When the maximum total resistance route is directly determined according to the air volume and tunnel parameters (section, length, etc.). ), you can calculate the total resistance of the mine according to the resistance of this route. When it cannot be determined directly, several possible maximum routes should be selected for calculation and comparison, and then.
When the total resistance of mine ventilation system is minimum, it is called ventilation easy period. When the total resistance of ventilation system is maximum, it is called ventilation difficult period. For the period when ventilation is easy and difficult, the ventilation system diagram should be drawn separately. According to the needs of coal mining face and cavern, the air volume is distributed, and then the total mine pressure is calculated through the resistance of each section of wind road.
For the convenience of calculation and inspection, the format in Table 7-4-5 can be used to calculate the friction resistance hft of each section along the airflow route in the ventilation easy period and difficult period, and then calculate the total friction resistance hfe and hfd in the ventilation easy period and difficult period respectively, and then multiply it by 1. 1 (the expansion mine is multiplied by 1. 15.
The total resistance in the period of easy ventilation hme = (1.1~1.15) hfe.
Total resistance in difficult ventilation period HMD = (1.1~1.15) HFD.
In the above two formulas, hf is calculated according to the following formula:
hf= hfi
Where hfi= Qi2
Chapter V Selection of Mine Ventilation Equipment
The first section of mine ventilation equipment refers to the main ventilator and motor.
(1) The mine must be equipped with two sets of main ventilation equipment with the same capacity, one of which is used as a backup.
(2) The selection of ventilation equipment should meet the changes of working conditions in different periods of the first mining level, and make the ventilation equipment run efficiently for a long time. When the working condition changes greatly, the motor should be selected by stages according to the mine staging time and energy saving situation.
(3) The fan capacity should have a certain margin. When the axial flow fan is designed according to the maximum negative pressure and air volume, the blade running angle should be 5 less than the allowable range; The selection and design speed of centrifugal fan should not be greater than 90% of the maximum allowable speed.
(4) When the elevation difference between the inlet and outlet air wells is above 150m, or the elevation of the inlet and outlet air wells is the same, but the depth of the well is above 400m, the natural wind pressure of the mine should be calculated.
The choice of main ventilator in the second quarter
(1) Calculate the fan air volume Qf.
Due to the external air leakage (that is, the air leakage of the wellhead explosion-proof door and the reverse damper near the main ventilator), the fan air volume Qf is greater than the mine air volume Qm.
Qf=k Qm
Where Qf—— is the working air volume of main ventilator, m3/s;
QM- mine air demand, m3/s;
K—— air leakage loss coefficient, which is 1. 1 when the air shaft is not used for hoisting, and1.15 when the skip shaft is used for return air; Take 1.2 when the return air doubles as the lifting personnel.
(2) Calculate the wind pressure of the fan
The total pressure Htd of ventilator and natural wind pressure HN*** work together to overcome the total resistance hm of mine ventilation system, the resistance hd of ventilator accessories (wind tunnel and diffuser) and the kinetic energy loss Hvd of diffuser outlet. Take "-"when the natural wind pressure is the same as that of the fan; When the natural wind pressure is opposite to the negative pressure of the ventilator, take "+". According to the provided fan performance curve, the wind pressure of the fan is calculated by the following formula:
Htd=hm+hd+Hvd HN
Generally, centrifugal fans provided by production are mostly total pressure curves, while axial fans are mostly static pressure curves. Therefore, the mine adopts draw-out ventilation:
Centrifugal fan:
In the relaxed period, htdmin = hm+HD+HVD HN.
Hard times htdmax = hm+HD+hvd HN
Table 7-4-5 Calculation Table of Mine Ventilation Resistance
Period node serial number roadway name support form a/
ns2m-4L/MU/MS/m2 S3/s6R/
ns2m-8Q/
m3s- 1q 2/
m6s-2hfi
/paV/
ms- 1
Relaxed period
hfi=∑hfi= pa
Difficult period
hfi=∑hfi= pa
Axial flow fan:
Htd min=hm+hd-HN in relaxed period
Hard times Htd max=hm+hd+HN
In the period of easy ventilation, in order to make the natural wind pressure have the same effect as the fan wind pressure and make the fan have higher efficiency, the natural wind pressure HN is subtracted from the ventilation system resistance; In the difficult period of ventilation, in order to satisfy the capacity of the fan when the natural wind pressure acts in the opposite direction to the wind pressure of the fan, natural wind pressure HN is added to the resistance of the ventilation system.
(3) Primary selection of ventilator
According to the calculated Qf and Hsd min (or Htd max) of the ventilator in the mine ventilation easy period and Qf and Hsd max (or Htd max) of the ventilator in the mine ventilation difficult period, the ventilator that meets the mine ventilation requirements is selected on the ventilator characteristic curve.
(4) Find the actual working point of the ventilator.
Because the working points determined according to Qf, Hsd max (or Htd max) and Qf, Hsd min (or Htd max), that is, the design working points are only different in the characteristic curve of the selected fan, the actual working points must be determined according to the working resistance of the fan.
1) Calculate the working wind resistance of the ventilator.
When the static pressure characteristic curve is used:
Ssd minimum =
Ssd maximum =
When using the total pressure characteristic curve:
RTd minimum =
Standard Maximum =
2) Determine the actual working point of the ventilator.
Make the working wind resistance curve of the fan on the fan characteristic curve and the intersection with the wind pressure curve as the actual working point.
(5) Determine the model and speed of the ventilator.
According to the operating parameters (Qf, Hsd, η, N) of each fan, the technology, economy and safety of the primary fan are compared, and finally the model and speed of the fan with advanced technology, high efficiency and low operating cost are determined to meet the requirements of mine ventilation.
(6) Motor selection
1) fan input power According to the easy and difficult periods of ventilation, calculate the input power Nmin and Nmax required by the fan respectively.
nmin = Qf Hsd min/ 1000ηs Nmax = Qf Hsd max/ 1000ηs
Or nmin = qfhtdmin/100 η t nmax = qfhtdmax/100 η t.
Where ηt and ηs are the total pressure efficiency and static pressure efficiency of the ventilator respectively;
2) Number and type of motors
When Nmin≥0.6Nmax, the motor can be selected, and the motor power is
Ne=Nmax？ ke/(ηeηtr)
When nmin
Initial Nemin=? ke/(ηeηtr)
Press Ne=Nmax in the future? Ke/(ηeηtr) calculation.
Where ke is the motor capacity reserve coefficient, ke =1.1~1.2.
ηe- motor efficiency, η e = 0.9 ~ 0.94 (larger motor takes higher value).
η TR-transmission efficiency, ηtr= 1 when the motor is directly connected to the ventilator, and ηtr=0.95 when the belt is driven.
When the motor power is above 400 ~ 500 kW, synchronous motor should be selected. Its advantages are that it can be used to improve the power factor of power grid and save electricity when the mine is running at low load; The disadvantage is that the purchase and installation cost of this kind of motor is high.
Chapter VI Estimation of Mine Ventilation Cost
The ventilation cost per ton of coal is an important economic index for ventilation design and management. Statistical analysis of cost composition is an indispensable basic data to explore reducing costs and improving economic benefits.
The ventilation cost per ton of coal mainly includes the following expenses:
1. Electricity charge (W 1)
The ventilation electricity charge per ton of coal is the sum of the annual electricity consumption of the main ventilator and the electricity charge of the underground auxiliary ventilator and local ventilator divided by the annual output, which can be calculated according to the following formula:
W 1=(E+EA)×D/T
Where e is the annual power consumption of the main ventilator, which is calculated according to the following formula in the design:
When you choose the motor in the period of easy ventilation and difficult ventilation,
E=8760(Nemin+ Nemax)/(keηvηw)
When two motors are selected
E=4380(Nemin+ Nemax)/(keηvηw)
Where d-electricity price, yuan/kw? h
T- mine annual output, t;
EA-annual power consumption of local ventilator and auxiliary ventilator;
ηv—— transformer efficiency, which can be 0.95.
ηw—— cable transmission efficiency, which depends on cable length and cable loss per meter, and is selected within the range of 0.9 ~ 0.95.
2. Equipment depreciation expense
The depreciation expense of ventilation equipment is related to the quantity, cost and service life of the equipment, which can be calculated in Table 7-4-6.
Depreciation expense W2 of ventilation equipment for tons of coal is
W2=(G 1+G2)/T
Table 7-4-6 Ventilation Cost Calculation Table
order
figure
device name
unit of measure
Total cost of quantity
Full service
affairs
year
Limited depreciation expense for capital investment and overhaul.
comment
Unit cost, equipment cost, transportation and installation cost
3. Material consumption cost
Including the cost of materials for various ventilation structures, lubricating oil for fans and motors, dust prevention and other facilities. The ventilation material consumption fee W3 per ton of coal is:
W3=C/T
Where c is the total cost of material consumption, yuan/a.
4. Wages and expenses of ventilation personnel
The total annual salary of mine ventilation personnel is one yuan, and the wage cost of one ton of coal W4 is
W4= USA
5. Depreciation fees and maintenance fees for mine engineering specially serving ventilation.
The cost converted into tons of coal is W5.
6. Purchase fee and maintenance fee of ventilation instrument for tons of coal W6
The total ventilation cost w per ton of coal mined in the mine is
W= W 1 +W2+ W3+ W4+ W5+ W6 ore
Concluding remarks
Three years of study is coming to an end. Through three years of systematic study, I have mastered solid basic theory and systematic professional knowledge, and my professional level has been greatly improved. Everything is due to the in-depth teaching and enthusiastic encouragement of teachers in Liaoyuan Vocational and Technical College. When I am about to graduate, I want to thank all the teachers who have educated and cared for me in the past three years. During my study, they gave me the most powerful help and encouragement. This project was completed under the careful guidance of my tutor Professor Liu Wenwen. For more than half a year, Liu Jiaoshou asked about the progress of the project many times, which helped me to open up my research ideas. Liu Jiaoshou set an example for me with his rigorous and realistic learning attitude, high professionalism, diligent work style and innovative spirit. I would like to extend my sincere thanks and high respect to Liu Jiaoshou.
refer to
(1) He Tingshan Mine Ventilation and Safety, 2009
(2) Yu Xiaofeng and Liu Qizhi, authors and professional groups of teaching materials for coal mining technology.