JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives

In view of very difficult /uncomfortable environment envisaged in deeper mines in

future, this course aims at sampling and analysis of mine air, understanding of heat, humidity, distribution of air, natural ventilation etc for underground mines. Mechanical ventilation devices including auxiliary fans, booster fans etc are also covered in this course.

Course Outcomes

At the end of the course, students will be able to

• 1. Understand origin, physical and chemical properties of mine gases and their physiological effects
• 2. Understand Heat, Humidity and Air flow in mines
• 3. Understand Principal types of mine fans, Series and parallel operation of mine fans
• 4. Understand Standards of ventilation and Air distribution
• 5. Understand Ventilation Planning and Network analysis.

UNIT - I

Mine Gases: Origin, occurrence, physical, chemical and physiological properties of mine gases, instruments used for spot detection of mine gases. Various damps, methane drainage techniques. Gas chromatography.

UNIT - II

Mine Climate and Control: Sources of heat and humidity in mines and their effects, instruments used for measurement of temperature, humidity, pressure and velocity. Heat stress indices, cooling power and method of improving cooling power.

UNIT - III

Natural Ventilation and Laws of Air flow: Natural ventilation, Factors effecting NVP, Direction of air flow, Derivation of NVP, Motive column, Atkinson law governing airflow in mine openings.

UNIT - IV

Mechanical Ventilation: Definition of Mechanical ventilation, Different types of fans and their characteristics, Operating point, Fan laws, installation. Ventilation appliances, economic size of roadways, determination of quantity and head requirements. Fan selection and evasee. Ventilation networks: simple and complex, solutions to simple ventilation network. Introduction to Hardy cross method for solving complex network. Introduction to ventilation software’s.

UNIT - V

Ventilation Planning: Standards of ventilation, ascensional ventilation, descensional ventilation, ventilation planning for different mining methods: Bord and pillar, Longwall mining method and cut and fill, sub level caving and shrinkage stoping method.

TEXT/ REFERENCE BOOKS:

• 1. Mine Environment and Ventilation. Mishra GB. Oxford University Press, 1992.
• 2. Mine Ventilation and Air Conditioning. Hartman HL. Wiley Interscience publication, 1993.
• 3. Subsurface Ventilation and Environmental Engineering. Pherson Mc. Chapman and Hall Publication, London, 1993.
• 4. Mine Environment Engineering. Vutukuri VS. Trans Tech Publishers, 1986