Research On Pyrolysis Characteristic Of Typical Organic Components Of MSW

The technology of Pyrolysis is regarded as the typical way which is recycled andnon-hazardous in the proposal of MSW. The major component of MSW is organicwaste which can be converted into improvable resources by means of pyrolysis. Insuch a way, it is complied with the advocation of the principle of circular economyapplied in wastes proposal, embodying the key point of effective and recycled utilityof resources. Single component waste pyrolysis was studied frequently in the formerresearches and the raw materials were usually pre-dried. It is hard to give guidancefor the waste mixtures pyrolysis process on the basis of single component pyrolysis,besides, the positive effect of moisture content contained in MSW for pyrolysis wasalways neglected. In this paper, the experimental materials were the typical organicwastes. The characterizations of both the single (fabric, waste paper, PE and sawdust)and mixtures of wastes were both studied through thermogravimetry, expecting topredict the pyrolysis regulation of waste mixtures based on the results of singlecomponent. The influence of parameters in the pyrolysis of simulated MSW withvarious moistures was explored and the recycled use of char was also preliminarydiscussed.It is concluded that only one mass loss process appeared during the individualpyrolysis of fabric, waste paper, PE and sawdust while two mass loss processesappeared in waste paper pyrolysis. The percent conversion of the four componentswas up to60%during the mass loss process individual and that was up to93%at750℃. The percent conversion varied slightly after750℃. The results of wastemixtures pyrolysis indicated that the pyrolysis characterization of mixture (fabric andwaste paper, waste paper and sawdust) was not influenced by the single componentspyrolysis steps; the experimental trend of mixture (waste paper and PE, sawdust andPE) was consistent with the predicted but the conversion rates were widely different;the pyrolysis characterization of mixture (fabric and PE, fabric and sawdust) wasinfluenced obviously by the single components pyrolysis steps. The pyrolysis of simulated MSW with various moistures demonstrated that themaximum gas yield and H2yield and the minimum tar content were both obtained atthe moisture content of43.38%; gas yield increase and tar content decrease wereboth impacted by reactor temperature, catalyst types and gas residence time.The syngas yield met the highest value of1.08L/g when the proportion of steamand CO2was80%:20%, and the steam performed stronger inhibition to CO2gasification than the inhibition of CO2to steam gasification. Steam gasificationdominated before850℃and before the reaction time of8min, nevertheless, CO2gasification was enhanced after850℃and8min reaction time later.