The Study Of Resource Utilization Of The Waste From Ship

As the most important means of transportation in world trade,around 90% of the worldwide goods and goods were conveyed to various fields by ship.In the shipping process,ships will produce a lot of rubbish,if the rubbish cannot dispose with suitable treatment will cause significant damage to the ecological environment.Marine environment pollution caused by ships has become a serious problem,only the emissions cause by ship has accounted for 10% of global atmospheric pollution.Therefore,to explore and study on efficient and clean utilization technology of waste from large ship accord with the actual situation has important practical significance.The pyrolysis properties of plastic waste from ships were investigated by means of thermogravimetric analysis(TGA) under different heating rates and atmospheres,from which the kinetic prarameters were also obtained.The results showed that the pyrolysis process of plastic waste from ships has three main stages which was more complicated than ordinary plastic;the pyrolysis characteristic parameters such as maximum weight loss rates increased and the reaction became intense when the heating rate increased;when the proportion of N2/CO2 was 4:1,a thorough pyrolysis reaction and a minimum rate of residual solid appeared.The kinetic analysis indicated that the global pyrolytic processes could be described as three consecutive first order reactions.A satisfied fitting of experimental data was obtained for samples studies. Different heating rates and atmosphere had various influence on the activation energy of the reaction stages.The pyrolysis behaviors of PVC,PE and PA6 which respectively are the major components in waste from ship were studied using the thermogravimetric analyzer coupled with Fourier transform infrared spectrometer(TG-FTIR).To investigte the influence of interaction of pyrolysis of different components,the weight loss characters and gas production from mixture experiment were used to investigate the influence by interaction.There was just one reaction stage for the pyrolysis of PA6 and PE, but were two stages for PVC.Obvious synergistic effect was happended during the co-pyrolysis of PE&PA6,PVC&PA6 blend on account of the intermolecular transfer of free radical,and the co-pyrolysis of three components can reduce the reaction activation energy and the residual quality,improve the volatile products(such as pyrolytic oil, gas) in different degrees.Six kinds of typical components combustion characteristic parameters were obtained by weight loss characters and gas escaping analysis experiment under different heating rate.Mixed experiments were studied by every two component blend under the heating rate of 20℃/min,and results show that:PVC&heavy oil,wood,PA6,heavy oil&cotton fiber blend can promote the reaction and reduce residual quality; wood&plastic,PVC&PA6 mixed combustion can significantly inhibiting the production of CO;heavy oil&cotton fiber blend can inhibiting the production of CO2;PVC&cotton fiber,PVC&PA6 or PE,wood&PA6 or PE,PA6&cotton fiber blend can inhibiting the production of NOx;wood&PA6 or PE,heavy oil& PA6,PVC blend with others can inhibiting the production of SO2.For the energy saving,a comprehensive utilization waste heat recovery system was proposed,and the parameters of working fluid and system components are calculated to provide a basis for equipment design and selection in this paper.Exergy and heat analysis was applied for the losses and efficiency.The results of the economic analysis show that the energy utilization ratio and power plant effective thermal efficiency are improved by 3.54% and 3.11% respectively;the energy-saving effect was remarkablehe and investment in waste heat recovery system was feasible.