Selection of Main Mechanical Ventilators for Underground Coal Mines

Selection of Main Mechanical Ventilators for Underground Coal Mines – A Case Study
Ajay Kumar Jha
Contents
1 Importance and Characteristics of Main Mechanical Ventilator 1
1.1 Introduction . 1
1.2 Characteristics of Main Mechanical Ventilator 2
1.3 Prime Factors for Selection of Main Mechanical Ventilator 3
1.4 Complexities in Selection of Main Mechanical Ventilator . 3
1.5 Summary of the Chapter . 5
References . 5
2 Ventilation Network Analysis . 7
2.1 Introduction . 7
2.2 Analytical Method 8
2.3 Numerical Method 8
2.4 Hardy Cross Method 9
2.5 Monte Carlo Method 10
2.6 Ventilation Modeling 10
2.7 Summary of the Chapter . 15
References . 15
3 Method of Selection of Main Mechanical Ventilator . 17
3.1 Introduction . 17
3.2 An Overview of Technical Considerations . 17
3.3 Precautions to Be Taken During Technical Considerations . 19
3.4 Economic Considerations 20
3.5 Summary of the Chapter . 23
References . 23
4 Possible Ways for Reducing the Ventilation Cost 25
4.1 Introduction . 25
4.2 Methods of Reducing the Ventilation Cost . 25
4.2.1 Reducing the Pressure/Head Loss due
to Mine Resistance 26
4.2.2 Selecting a Fan with the Highest Possible Effciency . 27x
4.2.3 Reducing the Gas Amount Using Methane
Drainage in Very Gassy Mines 27
4.2.4 Reducing All Air Leakages to a Minimum . 28
4.2.5 Reducing the Resistance of Mine Shaft 28
4.3 Flow Control and Energy Saving . 28
4.3.1 Constant Speed of Drive and Fan with Capacity
Control by Devices Which Modify the Fan
or the System Characteristics 29
4.3.2 Constant Speed Drive with Provision for Variation
of Fan Speed by Auxiliary Intermediate Devices
Between the Fan and the Drive 29
4.3.3 Variable Speed Drive Directly Coupled to the Fan . 29
4.3.4 Deblading . 29
4.3.5 Variable Volume or Variable Geometry Mechanisms . 30
4.4 Facilities to Regulate Ventilation in Mechanical
Ventilator in Axial Flow Fan 30
4.4.1 Airfoils . 34
4.4.2 Casing . 40
4.4.3 Collector 40
4.4.4 Cowl . 40
4.4.5 Diffuser 40
4.4.6 Blades 41
4.5 Summary of the Chapter . 41
References . 41
5 Computer Program for Fan Selection 43
5.1 Introduction . 43
5.2 Algorithm . 43
5.3 User’s Guide and Data Handling . 44
5.3.1 Data Files Used by the FAN.EXE Program . 44
5.3.2 Preparing Cost Parameters Data File 45
5.3.3 Preparing Fan Characteristics Data File . 46
5.3.4 Preparing Effciency Data File . 46
5.3.5 Preparing Power Data File 46
5.3.6 Important Note . 46
5.4 Running the Program and Compiling the Program . 46
5.4.1 Compiling the Source . 47
5.5 Limitation of the Program 47
5.6 Summary of the Chapter . 47
References . 48
6 Application of the Computer Program: An Indian Case Study . 49
6.1 Introduction . 49
6.2 Particulars of Data Files 50
6.3 Program Output Including Graphical Output . 52
Contentsxi
6.4 Interpretation Drawn from Program Output 52
6.4.1 Discussion on FAN-1 53
6.4.2 Discussion on FAN-2 53
6.4.3 Discussion of FAN-3 54
6.4.4 Discussion of FAN-4 55
6.4.5 Discussion on FAN-5 56
6.4.6 Discussion of FAN-6 57
6.4.7 Discussion on FAN-7 57
6.4.8 Discussion on FAN-8 58
6.4.9 Discussion of FAN-9 58
6.5 Conclusions Drawn from Program Output . 59
6.6 Summary of the Chapter . 74
Annexure-I 77
Contents© The Author(s) 2017 1
A.K. Jha, Selection of Main Mechanical Ventilators for Underground
Coal Mines, SpringerBriefs in Environmental Science,
DOI 10.1007/978-3-319-56859-1_1
Chapter 1
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