JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Pre-Requisites

NIL

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:

Student can understand the ventilation requirements for ground mines including selection of mine fans, ventilation planning, ventilation surveying etc. For any underground mine, ventilation officer is a statutory post as per Indian Mining Law. This course facilitates the required knowledge to perform the duties of ventilation planning effectively.

UNIT - I

Atmospheric air-its composition, mine air – its composition and variation, origin, occurrence, physical, chemical and physiological properties and monitoring of mine gases, various types of damps. Sampling and analysis of mine air. Methane drainage and methane layering of gases. Ventilation Air Method (VAM), Cowords diagram, Flame safety lamp monitoring system.

UNIT - II

Heat and humidity: Sources of heat in mines, effect of heat and humidity, psychometric, kata thermometer, methods of improving of cooling power of mine air. Air conditioning basic vapour cycle, representative layout. Air flow through mine openings: Laws of air flow, resistance of airways, equivalent orifice, distribution of air, flow control devices.

UNIT - III

Natural Ventilation: Calculation of NVP from air density, artificial aids to natural ventilation. Mechanical ventilation: Principal types of mine fans and their suitability, merits, limitation, efficiency and characteristics. Selection of mine fan, fan testing, output control in fans, series and parallel operation of mine fans. Controlled recirculation, ventilation network analysis.

UNIT - IV

Auxiliary fan, duct, matching of fan to the duct system. Reversal of air current. Fan drift, evasee, diffuser, booster fans, Face Ventilation. Ventilation surveys and surveying instruments. Ventilation planning: Standard of ventilation including permissible air velocities. Ascensional, descensional, homotropal, anti-tropal ventilation. Central and boundary ventilation – ventilation surveys and surveying instruments, layouts and comparison. Economics of ventilation.

UNIT - V

Quantity and pressure requirement. Ventilation layout for coal mining and metal mining. Calculation of air quantity and total mine head required for ventilating a mine. Introduction to Network analysis: Hardy-Cross method, Ventilation survey.

TEXT BOOKS:

• 1. Mine Environment and Ventilation – G.B. Misra
• 2. Mine Ventilation and Air Condition – HL Hearlman R18 B.TECH MINING ENGG.

REFERENCE BOOKS:

• 1. Vatukuri V.S. & Lama R.D. – Environmental Engineering in Mines.
• 2. Dhar B.B. – Mining and Environment. R18 B.TECH MINING ENGG.