In this article we will discuss about the types of drilling methods used in mining. The types are: 1. Percussive Drilling 2. Rotary Drilling. Method # 1. Percussive Drilling: In this method which is the oldest one of drilling, the hole is drilled by striking a number at short in intervals on the rock by a chisel-type tool and between [...]
Mining Methods: Longwall, Horizon and Level Mining Methods! Apart from the commonly practiced "bord and pillar" method of mining followed in this country, the other methods of mining adopted in some collieries are: 1. Longwall Mining Method 2. Horizon Mining 3. Level Mining or Semi-Horizon Mining Room and pillar method of mining is not practiced in any of the collieries [...]
Ordinary methods of shaft sinking are not suitable in some cases and special methods have to be adopted under the following conditions: 1. Loose or unstable ground, such as sand, mud, etc. 2. Excessively watery strata. 3. A combination of the above two. The special methods are: 1. The Piling System 2. Caisson Methods 3. Freezing Method 4. Cementation Process [...]
Pumping of concrete is economical if the quantity of concrete required is more than about 1150 m3 or uninterrupted supply of concrete is needed over a long period as at the beginning of each period of pumping the pipes have to be lubricated by mortar (at the rate of about 0.25 in3 per 1000 m length of 150 mm diameter [...]
Pumping of concrete is economical if the quantity of concrete required is more than about 1150 m3 or uninterrupted supply of concrete is needed over a long period as at the beginning of each period of pumping the pipes have to be lubricated by mortar (at the rate of about 0.25 in3 per 1000 m length of 150 mm diameter [...]
In this article we will discuss about:- 1. Meaning and Requirements of Form Work 2. Planning and Organising for Form Work 3. Materials Used 4. Design Load 5. Form Work of Columns and Walls 6. Points to be Kept in Mind before Placing Concrete in Form Work. Meaning and Requirements of Form Work: The temporary construction used as a mould [...]
In this article we will discuss about:- 1. Principle of MHD Power Generation 2. Advantages and Limitations of MHD Power Generation 3. Voltage and Power Output. Principle of MHD Power Generation: The magneto hydrodynamic (MHD) power generation is one of the examples of a new unique method of power generation and provides a way of generating electrical energy directly from [...]
In this article we will discuss about the open and closed cycle MHD system. Open Cycle MHD System: An elementary open cycle MHD system is a system in which a high pressure, high temperature combustion gas is forced through a strong magnetic field. Coal is processed and burnt in the combustor at a high temperature of about 2,600°C and pressure [...]
In this article we will discuss about:- 1. Introduction to Wind Power Generation 2. Wind Energy Generators (WEG) 3. Combined Wind-Diesel Power Plants 4. Combined Solar-Wind Power Plant 5. Wind Potential 6. Advantages and Disadvantages of Wind-Generated Electricity. Introduction to Wind Power Generation: Winds are essentially caused by the solar heating of the atmosphere. They carry enormous quantity of energy. [...]
In this article we will discuss about:-1. Principle of Thermoelectric Power Generation 2. Thermoelectric Materials in Thermoelectric Power Generation 3. Thermoelectric Power Generator 4. Applications. Principle of Thermoelectric Power Generation: Thermoelectric power generation process is based on the Seebeck effect which states that loop of dissimilar metals will develop an emf if the two junctions are kept at different temperatures. [...]