HYBRID COAL: EFFECTS ON FEED/FUEL RATIO AND FUEL FEEDING METHOD IN LOW RANK COAL AND BIOMASS WASTE CO-PYROLYSIS PROCESS ON THE PRODUCTâS YIELD IN SEMI-DOUBLE CHAMBER REACTOR
Coal is a solid fossil fuel. Coal has a heating value that can be used as energy. From the time it was discovered in 200-300 million years ago to the present time, coal utilization still continues. Even so, there is a major problem with the use of coal, which is the pollution that released, where...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/38885 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Coal is a solid fossil fuel. Coal has a heating value that can be used as energy. From the time it
was discovered in 200-300 million years ago to the present time, coal utilization still continues.
Even so, there is a major problem with the use of coal, which is the pollution that released,
where one of the biggest pollution is carbon dioxide which is one of the greenhouse gases. One
way to reduce emissions is by combining coal and biomass using co-pyrolysis. Co-pyrolysis is
basically the process of decomposition of organic matter thermally without or using a limited
amount of oxygen which the raw material used is more than one fuels combined together.
Biomass is known as a fuel that is more environmentally friendly because it has a zero or neutral
carbon footprint, so combining coal and biomass will cause the carbon footprint value to
decrease compared to the use of coal alone. In consideration within that issue, this research is
carried out regarding the manufacture of hybrid coal. This research is a follow-up study of
previous hybrid coal research. The purpose of this study is to analyze the energy supply in the
pyrolysis reactor to make hybrid coal, with the specific aim being to find the ratio of fuel vs
mixture of coal and biomass used for feed that needed for the production of hybrid coal in semidouble
chamber reactors with the batch type of operation and to calculate the carbon footprint
of the manufacture of hybrid coal in the batch production process. The reactor operates
atmospherically, and the feed mixture of coal and biomass is fixed, which is 250 grams. There
are two spaces in the reactor, namely the combustion chamber and the pyrolysis chamber. The
combustion chamber is used for the heat supply for co-pyrolysis. Co-pyrolysis is carried out
under minimal oxygen conditions. There are two process variables varied, namely the variable
feed ratio: fuel and fuel feeding method. Feed ratio: the fuel is varied by 1: 3, 1: 4 and 1: 5,
while the fuel feeding method is varied by one time feeding and twice feeding. The coal used is
subbituminous C coal obtained from the Center for Research and Development of Mineral and
Coal Technology (TekMIRA Research Center) and biomass for co-pyrolysis is sawdust waste,
with a composition of biomass in the mixture of 30%. From the results of the study, it was found
that the variation that produced the best energy yield was a variation of the feed ratio: 1: 3 fuel
in the one-time fuel feed method. This variation succeeded in increasing the rank of coal to
subbituminous class B. While the calculation of the carbon footprint from hybrid coal production
to its utilization for fuel resulted in a decline of up to 20.89%. The resulting hybrid coal is able
to compete with its raw coal as a first step towards clean coal technology.
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