Fundamental Study On Co-Coking With Blend Coal And Waste Plastics

The use of plastic produces and difficult decomposition have been the thorny environmental problem of the world. In China the use of coking coal has been beyond the normal ratio. The technique of co-coking with coal and waste plastics was been posed in the state of the lack energy supply in china and the whole world. As a secure and unpolluted disposal method of effective use, the new technology should be developed to increase the quantity of plastics to blend coal on the premise of not affecting the quality of coke in order to save more high-class coking coal and mitigate the crisis of energy resource in our china and the whole world.In this paper, the pyrolysis behaviors of waste plastics, blend coals and their mixture were investigated using the TG analyzer, the production distribution from co-coking of coal and waste plastics with different proportion were investigated by using 2kg simulating coke-oven, the coke reaction index (CRI) and coke strength after reaction (CSR) of coke from co-coking of blend coal and waste plastics are analyzed by the normal analysis method, the composition of tar from co-coking of blend coal and waste plastics were analyzed by GC/MS and the common composition of gas from co-coking of blend coal and waste plastics were analyzed by the gas chromatograph.The results indicate the mutual effect exists between the single coals, which could increase the maximum of thermal weight loss obviously and has a small effect on the temperature extent of the weight loss. The main pyrolysis production of coal is coke, but the main production of waste plastics is tar; the yield of water became decrease and the gas became increase by adding the waste plastics. And the CRI and CSR decreased with the ratio of waste plastics in coal. The main ingredients of tar from blend coal are aromatic hydrocarbon (benzene and naphthalene) and alkane, while those of waste plastics are alkane and alkene. The result of co-coking with coal and waste plastics make the light tar and the aromatic hydrocarbon increase obviously. The combustible ingredient(CO H₂ CH₄) of gas from co-coking with coal increase at different ratio; Co-coking with coal and waste plastics couldincrease the combustible ingredient and thermal value of gas.