In recent years, the problem of plastic waste has greatly increased because of industrial growth. As a result, the amount of plastic waste in domestic area is approximately 4,250,000 ton in 2007. The ways of these plastic waste disposal are still mainly relying on landfill or partially incineration....
In recent years, the problem of plastic waste has greatly increased because of industrial growth. As a result, the amount of plastic waste in domestic area is approximately 4,250,000 ton in 2007. The ways of these plastic waste disposal are still mainly relying on landfill or partially incineration. So it has become a serious social problem due to the secondary environmental pollution. The technologies for producing oil from the plastic waste have been developed for a long period and currently some of them are at a commercialization stage. Pyrolysis is one of the major processes in treating plastic waste but still has some restrictions for the commercialization due to its economical problems associated with a systematic feed collection/disposal ways. Considering environmental problems, for example the increase in the charge for waste materials treatment and the limitation of disposal area, it is interesting that the plastic waste treatment by pyrolysis and gasification, which seems to be the safest process for converting feed waste to reusable resources, would be predominant in the near future. This study, is aimed to increase the amount of syn-gas products by using steam as plasma gas in plasma system. The obtained results are summarized as follows: 1. From the Analysis results of Elemental analyser, HDPE and Melamine resin are 100% combustible. Main components of HDPE are C and H and caloric value is 11,613 kcal/kg. The main components of Melamine resin are C, N, O and calorific value is 3,577kcal/kg. 2. From the TG-DTA analysis in began to decompose, HDPE is reacted by the 1st reaction actively in the temperature range of 300~500℃ and the finished 2nd reaction in the temperature range of 500~600℃. Melamine resin is decomposed through 3 stage reactions. At the 1st reaction weight of Melamine resin is reduced to 300℃, at the 2nd reaction its weight is reduced rapidly in the range of 300~350℃ and finally combusted mostly in the range of 350~650℃. 3. Theoretically syn-gas production rate is calculated. In the case of HDPE, its production rate is calculated to 51.6% at C/O=0.7 by use of Air, to 99.2% at C/O=0.7 by O2, to 99.2% at C/O=0.7 by steam. In the case of Melamine resin, its production rate is calculated to 60.6% at original sample by Air, to 80.7% at C/O=0.7 by O2, to 83.9% at C/O=0.7 by steam. The condition of syn-gas product is the best in 1000℃. 4. Theoretically syn-gas production rate is calculated. In the case of HDPE, its production rate is calculated to 95.6% for C/O=0.55 at 1200℃ by use of steam. In the case of Melamine resin, its production rate is calculated to 76.8% for C/O=0.60 at 1400℃ by use of steam. The ingredients contained in the Melamine resin, except the amount of N2, was calculated to be 89.3%. 5. For the experiment of syn-gas product increasing, syn-gas is produced 81.7% from HDPE at the C/O ratio of 0.55 and 60.2% from Melamine resin at the C/O ratio of 0.60. But from the other ingredients of Melamine resin, except N2, syn-gas is produced 81.9%.
In recent years, the problem of plastic waste has greatly increased because of industrial growth. As a result, the amount of plastic waste in domestic area is approximately 4,250,000 ton in 2007. The ways of these plastic waste disposal are still mainly relying on landfill or partially incineration. So it has become a serious social problem due to the secondary environmental pollution. The technologies for producing oil from the plastic waste have been developed for a long period and currently some of them are at a commercialization stage. Pyrolysis is one of the major processes in treating plastic waste but still has some restrictions for the commercialization due to its economical problems associated with a systematic feed collection/disposal ways. Considering environmental problems, for example the increase in the charge for waste materials treatment and the limitation of disposal area, it is interesting that the plastic waste treatment by pyrolysis and gasification, which seems to be the safest process for converting feed waste to reusable resources, would be predominant in the near future. This study, is aimed to increase the amount of syn-gas products by using steam as plasma gas in plasma system. The obtained results are summarized as follows: 1. From the Analysis results of Elemental analyser, HDPE and Melamine resin are 100% combustible. Main components of HDPE are C and H and caloric value is 11,613 kcal/kg. The main components of Melamine resin are C, N, O and calorific value is 3,577kcal/kg. 2. From the TG-DTA analysis in began to decompose, HDPE is reacted by the 1st reaction actively in the temperature range of 300~500℃ and the finished 2nd reaction in the temperature range of 500~600℃. Melamine resin is decomposed through 3 stage reactions. At the 1st reaction weight of Melamine resin is reduced to 300℃, at the 2nd reaction its weight is reduced rapidly in the range of 300~350℃ and finally combusted mostly in the range of 350~650℃. 3. Theoretically syn-gas production rate is calculated. In the case of HDPE, its production rate is calculated to 51.6% at C/O=0.7 by use of Air, to 99.2% at C/O=0.7 by O2, to 99.2% at C/O=0.7 by steam. In the case of Melamine resin, its production rate is calculated to 60.6% at original sample by Air, to 80.7% at C/O=0.7 by O2, to 83.9% at C/O=0.7 by steam. The condition of syn-gas product is the best in 1000℃. 4. Theoretically syn-gas production rate is calculated. In the case of HDPE, its production rate is calculated to 95.6% for C/O=0.55 at 1200℃ by use of steam. In the case of Melamine resin, its production rate is calculated to 76.8% for C/O=0.60 at 1400℃ by use of steam. The ingredients contained in the Melamine resin, except the amount of N2, was calculated to be 89.3%. 5. For the experiment of syn-gas product increasing, syn-gas is produced 81.7% from HDPE at the C/O ratio of 0.55 and 60.2% from Melamine resin at the C/O ratio of 0.60. But from the other ingredients of Melamine resin, except N2, syn-gas is produced 81.9%.
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