A Paper on Clean Coal Technology

A PAPER ON CLEAN COAL TECHNOLOGY

                                  Submitted by:                                            

 C. Tharun Reddy                        B.Abhinay Reddy                      

II B.Tech., (ME)                         II B.Tech., (ME)                              Email ID:                                    Email ID: tharunr36@gmail.com               abhinaylivesforever@gmail.com                                                                                             

Ph. No: 9490121498                  Ph. No: 8500776267

[pic 1]

ABSTRACT:

                    Burning coal, such as for power generation, gives rise to   a variety of wastes which   must       be controlled    or at   least accounted     for.   Clean Coal Technologies (CCTs) are those which facilitate the   use of coal in an environmentally   satisfactory and economically viable way.  Among other aspects,    they   meet     various regulations covering   emissions, effluents, and residues. In some situations, CCTs offer the possibility of satisfying even more stringent   standards, at an acceptable cost. A   basic approach   to the     cleaner use     of coal   is   to   reduce emissions   b   reducing    the formation     of pollutants such as NOX and/or   cleaning the flue gases after combustion.        A    parallel approach   is to develop more      thermally efficient systems so that less coal     is used to generate the    same   amount   of   power, together with improved   techniques for flue gas cleaning, for effluent   treatment and for residues use or disposal...  Coal cleaning by ‘washing’ has been standard practice        in developed countries or some time. It    reduces emissions of  ash and SO2when the coal is burned gasification,        including       underground gasification in situ, uses steam and oxygen to turn the coal into         Carbon monoxide and hydrogen. Sequestration refers to disposal of liquid   carbon dioxide, once captured,   into deep geological strata utilization as clay.

 Alternative in cement raw material is composed    of lime stone, clay, silica, and silver   oxide, with clay accounting for 15% of total      composition. Coal ash containing silica (SiO2) and      alumina (Al2O3) is also used as an alternative to    such clay. But it  contains  less SiO2  and more     Al2O3 than clay  to   require more    silica as a source of SiO2 which becomes short  if  coal  ash is used   in large quantities,  there by   limiting      the substitutability of coal      ash for clay.  Electrostatic precipitators and fabric filters can remove 99%   of the fly ash from the flue gases - these technologies   are in widespread use. Flue gas desulphurization reduces the output of sulfur dioxide     to the atmosphere    by    up    to     97%,    the task depending on the level of sulfur in the coal and the extent of the reduction.