Page 213 - Energy from Toxic Organic Waste for Heat and Power Generation

Power Generation From Renewable Energy Sources 191

It is observed that HRR during the diffusion combustion phase of
HOME-PG operation with HCC was comparatively higher than that ob-
served with RCC. Changes in the HRR are mainly caused by variations
in gas temperature distributions for different fuel combinations. Hence, it
is concluded that fuel properties, blending additive, and use of combustion
chambers have major effect on the dual fuel combustion.

11.9 CONCLUSIONS

Experimental investigation showed addition of fuel oil derived from LDPE
to selected biodiesel of HOME and use of RCC in HOME-producer gas
fueled dual fuel engine is more effective in improving the dual fuel engine
performance. However, results presented are more appropriate in defining
the optimum blend ratio (HOME and fuel oil) in order to achieve the goals
of the conversion process and reduction of emissions.
• Catalytic pyrolysis of LDPE leads to the production of fuel oil, which
is a valuable resource recovery, and reduction of waste problem. By the
thermal degradation of LDPE plastic waste, conversion is found to be
97.2%, whereas by catalytic conversion of 99.1% was achieved; the yield
of oil obtained by catalytic is 18% more when compared to thermal.
• During catalytic pyrolysis, 44.80% lighter fractions were obtained when
compared to thermally derived oil. The component of oil obtained
(C 13 –C 25 ) has properties of conventional diesel. Major fraction obtained
is reduced crude oil having carbon range of C 25 –C 38 , which can be fur-
ther fractionated by vacuum distillation or visbreaking. Thus, the new
basic catalyst CaCO 3 can be used as a catalyst to crack LDPE plastic.
• No significant improvements have been observed in power derating, but
use of 20% fuel oil during HOME-producer gas operation with RCC
facility resulted in 3%–4.9% increased brake thermal efficiency when
compared to HOME-producer gas (HCC) operation.
• Further use of RCC leads to efficient mixture preparation caused by the
effective swirl, resulting in acceptable emission levels. In addition, im-
provements in performance and the trade-off between smoke and NO x
emissions were observed for dual fuel operation if fuel oil-HOME fuel
blends were used along with RCC configuration.
• Producer gas fueled dual fuel engine operation was found to be not satis-
factory when more than 20% fuel oil was used in HOME. With all opti-
mized operating conditions, on an average, for HOME+FO30-producer
gas (RCC) operation, 3%–4.8% increased BTE, 6%–17% decreased