Green strategies in formulating stabilizing and pipeline

Coal is extensively used as a fossil fuel in thermal power plants to generate energy As stated in earlier reports [1] countries like India have almost 60% of their thermal power plants primarily dependent on coal Notwithstanding its economic importance there are serious environmental concerns due to the losses due to the coal dusts at the mine site and the coal

Coalface Idioms by The Free Dictionary

Definition of coalface in the Idioms Dictionary coalface phrase This expression is used to suggest that these are the people who really know about the profession Note In a coal mine the coalface is the part where the coal is being cut out of the rock to have their views fed into the decision making process so they actually

A Novel Comprehensive Detection Method for the Dynamic

Accurate and efficient acquisition of information about the dynamic characteristics of coalface overburden can provide an important theoretical basis for green mining in coal producing regions in western China In this study a novel method for comprehensively detecting the dynamic behavior of coalface overburden is proposed in order to address deficiencies of the existing

A physical scale model of flows in the waste of a retreat longwall coalface

This paper presents a meta modelling algorithm that automates the very labor intensive and therefore time heavy and therefore expensive and expensive process of calibration and validation of physical and Computer modeis mining Background Both physical and Computer modeis are dependent on data from the real mine for calibration and validation The two types

Welsh colliery horses Museum Wales

They have been used to transport coal from the collieries to the customer have been used to power winding and pumping engines and most importantly to move coal from the coalface to the shaft In 1878 the RSPCA calculated that there were over 200 000 horses at work in British mines

Coal a record of an industry — Google Arts & Culture

Opencast coal extraction is undertaken where coal seams are close to the surface It began in England in 1941 as a wartime emergency measure however it continued after the war By the 18th century large pits used horses and wagons to haul coal from the coalface for transportation to the surface In some pits horses were stabled underground

Effect of longwall face advance rate on spontaneous heating process

A commercial CFD software programme FLUENT was used to study the oxidation process of coal in the mined out longwall gob area A three dimensional single phase model with a continuously advancing longwall face has been developed For the model the gob longwall area was designed on the basis of the actual longwall panel operating in the Ostrava

Selection of coal transportation mode from the open pit

Coal produced in open pit mines should be moved to thermic power plants for production of power Thermic power plants require very large amounts of coal In transportation process of this coal both costs and technical parameters should be considered Common alternative transportation modes in this process are belt conveyors truck types suspension rail

Study on the evolution characteristics of molecular surface

According to the coal oxygen composite theory [22 23] the initial heat required for the chemical adsorption process during CSC is sourced from the physical adsorption process of coal and O 2 which significantly advances the progression of CSC The change in the electrostatic potential on the surface of the macromolecules affects the physical

Failure mechanism and control technology of longwall coalface

The roof pressure on coalface q is the main factor causing coalface to fail; the larger the mining height H the greater the roof pressure; the greater the supporting strength p is the smaller the roof pressure on the coalface failure is more severe Flipper plays a great role in preventing the fracture coal body from slumping down but has little effect

Analysis of Fracture Mechanics Theory of the First Fracture

Because the first weighting of a main roof with a large mining height has obvious sudden characteristics and is more severe which causes large scale support crushing and has a great impact on the ecological environment of the mining area it is necessary to conduct an in depth analysis This paper studies the mechanical mechanism and asymmetric fracture

Dynamic manifestation mechanism of mining on the island coalface

Yang et al [17] proposed putting the rockbursts of island working faces under "classified control" and classified island working faces into six types that is island working faces with critical

Coalface definition of coalface by The Free Dictionary

Other studies look at law and the social sciences from such perspectives as from nudge to culture and back again coalface governance in the regulated organization law and the dead body whether a corpse is a person or a thing the lessons and limitations of experiments in democratic deliberation the politics of professionalism reappraising

Diagnostics of Technical Condition of Gear Units of Belt

Transportation of coal from the coalface to the surface is an important process the cost of which ranges from 70 to 80% of the total costs of production Thus on one hand the spent time on non productive pauses in the transportation chain should be kept to a minimum and on the other hand it should be minimizing energy costs

A model for the spontaneous heating of coal ScienceDirect

As part of an investigation into the spontaneous heating of coal piles a one dimensional model has been developed to describe the spontaneous heating process at relatively low temperatures < ≈ 100 °C

Coal Logistics Ministry of Coal

Creating transport infrastructures and managing logistics to transport coal from point of origin to consumption centres are major challenges for sustainable development of coal market Since coal is still the bedrock of energy generation in the country logistics associated with movement and transportation of coal in India is through various modes

Special issue on coal gasification science and technology

For the conventional mining and surface gasification the coal may experience mining coal washing crushing and slurry preparation which is time cost and energy intensive processes The survey of energy resources was published in 2016 which estimated that the world coal reserves are approximately 890 billion tonnes and there are another

Understanding "at the coal face" Idiom Meaning Origins

4 Learn the meaning and origin of the idiom Origins and Historical Context of the Idiom at the coal face The idiom at the coal face is commonly used in English to describe someone who is working directly with a difficult or challenging task The phrase has its origins in the mining industry where workers would spend long hours underground digging for coal

Physical Model Experimental Study on the Coalface

Due to technological and safety limitations there are considerable amounts of coal resources pressed under end slopes in open pit coal mines In recent years this problem has gradually attracted the attention of researchers How to realize the efficient recovery of side overburden resources while ensuring the stability and safety of slopes has become an

Impacts of underground coal mining on phreatic water level

Underground coal mining destroys overlying strata and phreatic aquifer above the panel is destabilized causing phreatic water level PWL variation On site monitoring of the PWL variation throughout the mining period is of great significance to the management and conservation of groundwater resources in arid and semiarid mining areas The research on the