|
Showing 1 - 3 of
3 matches in All Departments
During the last decade there has been a renewed interest in under
standing from a fundamental point of view the gasification of
carbon. Basi cally there are two major issues in controlling the
reactivity of carbon: i) reduction of the gasification rate of
carbon materials in hostile environment ii) increase of the
gasification rate in order to utilize carbonaceous compounds more
effectively. Although these two objectives look somewhat
contradictory, they are part of the general topics of understanding
gasification reactivity of carbon. Refractory applications of
carbon in furnace linings, seals and vanes, as well as the use of
carbon-carbon or carbon-ceramic composites in struc tures able to
withstand corrosion at high temperature require a better
understanding of the fundamentals involved in carbon-oxidizing gas
(02' CO, H 0) reactions. Furthermore a great interest of aluminium
producers 2 2 is 10 extending the lifetime of carbon electrodes in
alumina electrolysis which primarily depends on reducing their
consumption rates by air or carbon dioxide. Proper control of
gasification reactions is also of prime importance in manufacturing
carbonaceous adsorbents like granular activated carbon clothes of
high adsorption characteristics. The balance between increase of
porosity and decrease in mechanical strength during activation is
critical for developing new porous types of carbon materials in
particular for carbon clothes and this can only be achieved by a
careful control of the gasification reaction."
During the last decade there has been a renewed interest in under
standing from a fundamental point of view the gasification of
carbon. Basi cally there are two major issues in controlling the
reactivity of carbon: i) reduction of the gasification rate of
carbon materials in hostile environment ii) increase of the
gasification rate in order to utilize carbonaceous compounds more
effectively. Although these two objectives look somewhat
contradictory, they are part of the general topics of understanding
gasification reactivity of carbon. Refractory applications of
carbon in furnace linings, seals and vanes, as well as the use of
carbon-carbon or carbon-ceramic composites in struc tures able to
withstand corrosion at high temperature require a better
understanding of the fundamentals involved in carbon-oxidizing gas
(02' CO, H 0) reactions. Furthermore a great interest of aluminium
producers 2 2 is 10 extending the lifetime of carbon electrodes in
alumina electrolysis which primarily depends on reducing their
consumption rates by air or carbon dioxide. Proper control of
gasification reactions is also of prime importance in manufacturing
carbonaceous adsorbents like granular activated carbon clothes of
high adsorption characteristics. The balance between increase of
porosity and decrease in mechanical strength during activation is
critical for developing new porous types of carbon materials in
particular for carbon clothes and this can only be achieved by a
careful control of the gasification reaction."
The study of coal for the production of energy is certainly not a
new area of research. Many research works were carried out to
improve the efficiency of industrial and domestic facilities. In
the sixties, however, because of the availability and low cost of
petroleum, coal consumption decreased and the research effort in
this area was minimum. Meanwhile, the situation has totally
changed. Considering the reserves of oil and the instability
ofregions where they are located, it is becoming absolutely
necessary to develop other sources of energy.The major alternative
to oil appears to be coal, at least for the near future. Indeed,
the reserves known today represent several centuries of energy
consumption. t is therefore becoming urgent to develop efficient
and non polluting technologies to produce energy from coal. The
main possibilities are: . liquefaction . gasification . directed
combustion. Research and development efforts on liquefaction have
been considerably reduced because of high cost of technologies
involved and poor prospects for the next two decades. Research
works on gasification are progressing; it is a promising approach.
However, direct combustion either in pulverized coal furnaces or in
fluidized beds is the more promising way of expanding rapidly the
utilization of coal. These techniques are already used in some
facilities but many environmental problems remain, slowing down
their development."
|
You may like...
Loot
Nadine Gordimer
Paperback
(2)
R398
R330
Discovery Miles 3 300
|
Email address subscribed successfully.
A activation email has been sent to you.
Please click the link in that email to activate your subscription.