The Experimental Study On Co-pyrolysis Of Coal And Plastic

With the more and more serious "white pollution" problem, a lot of research are focus on how to make waste available. In recent years, scientists around the world make their best to use waste's higher H/C to provide H to coal while coal's pyrolysis. In the thesis, the effect of species of coal and plastic is studied by using thermo-gravimetry and 5g fixed-bed reactor.Five kinds of coal (GJ, KL, DT, LA and XXL) and five kinds of plastic (polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene glycol terephthalate (PET) and polyvinyl chloride (PVC)) are researched by thermo-gravimeter. Because of the superposition between the pyrolysis of the coals and plastics, there are possibilities to co-pyrogenate coals and plastics. Add plastics to coals with the percentage of 8. The co-pyrolysis of coals and plastics are researched by thermo-gravimetric analysis. According to the TG (thermo-gravimetry) curves and DTG (derivative thermo-gravimetry) curves, we can find that different plastics have different effort to the tiptop temperature and the last weightlessness of all coals. Contrast five plastics, PS and PET are separately mixed with low-volatile bituminous coal ands there are two peaks in the DTG curves of the mixture. Among the plastics, PP distinctively increase the last weightlessness and decline the tiptop temperature of pyrolysis.The Pyrolysis kinetics parameter (active energy (E) and frequency gene (A)) of all coals and the mixtures that have 8% plastics are counted by the Coast-Redfern formula. The function relations of volatile and E and volatile and tiptop temperature (tp) of pyrolysis. Adding the five plastics in coals, the Es can be increased and the tp can be declined. Among the five plastics, PS can obviously the E during coal's pyrolysis. For abundant chlorine in PVC, PVC can faintly affect the E of all coals.In fixed-bed, the mixtures of coals and plastics, which plastics are 8%, take place pyrolysis reaction while being heat up. The three phases (gas, liquid and solid)productive of the mixtures of plastics and coal are researched. Contrasting the productive of all phases whether adding plastics, we can find adding plastics can effectively increase the decomposing of coals and gas and liquid production. The conception of cooperating intensity (CI) is put forward in the thesis. The conception can scale the cooperation ability of plastics and coals. Comparing the CI of different mixtures, PP can obviously increase oil production and decomposing rate. The co-pyrolysis of coals and waste plastics are researched and adding waste plastic can't markedly enhance the coal's decomposing rate.Using general analysis method to measure the chlorine content during PVC's pyrolysis. During the temperature between 260~300, most chlorine in PVC is released. During co-pyrolysis of PVC and coals, the quantity of chlorine in gas and liquid product is researched in the thesis. Comparing two kinds of mixtures-8% PVC and 3% PVC, the chlorine in gas production is higher during 8% PVC mixtures.