Investigation Of The Shaping Capability Of Coking Coal Added With Waste Plastics And Their Co-carbonization

Waste plastics have become one of the main sources of organic pollution in cities.They belong to polymer materials,which degrade slowly and have a large amount.Some waste plastics will still cause secondary pollution when they are recycled and reused,so their utilization has been paid close attention to.The co-carbonization process of coking process can solve the problem of difficult treatment of waste plastics by adding waste plastics into charging coal,and gas production is increased at the same time.Through above,heavy chemical enterprises take their social public responsibility and explore a new way for them to be new green enterprises.In this paper,the pyrolysis and briquetting characteristics of single coking coal are studied,and the co-carbonization pyrolysis laws of coal micro-powder and waste plastics was discussed..The pyrolysis kinetic parameters of single coal,waste plastics,blended coal and waste plastics are obtained by thermogravimetry analysis,and the change laws of pyrolysis gas composition are analyzed by gas chromatography.The experimental results show that the performance indexes of the briquette are the best when the moisture content of the blended coal is 8% and the proportion of particle size less than 1mm is 78%.The briquette shatter strength is 76.42% and the briquette compressive strength is 60 N/piece.On the basis of the raw material ratio,the density of briquette has decreased after adding waste plastics,which affected the briquette shatter strength and compressive strength.The quantity and calorific value of the combustible gas produced in the co-carbonization process increased when 4% polyethylene PE,polypropylene PP,PVC and PS were added to the blended coal.The calorific value has increased by 5.18%,6.87%,10.49% and 7.71% respectively.The coking index experiment and the Audibert-Arnu dilatometer test decreased,but the softening melting temperature range increased when 4% polyethylene PE and polypropylene PP were added to the blended coal.There is a good coincidence between the weight loss temperature range of polyethylene PE and polypropylene PP and that of blended coal.The temperature range of weight loss is 390?-460?,370?-450? and 400?-550?,respectively.Especially,the weight-loss temperature range of blended coal added with polyethylene PE and polypropylene PP is widened to 385?-550? and 370?-550?,respectively It shows certain novelty.Through the study on the properties of crucible coke,it is found that the performance indexes of crucible coke are better when the amount of polyethylene PE and polypropylene PP is 4%.The PRI is 34.26% and 37.65% respectively.The PSR is 84.99% and 83.71% respectively.The SSI is 92.80% and 95.84% respectively.The MSI is 54.92% and 53.93% respectively.The porosity is 61.82% and 54.35% respectively.The microstructure and SEM analysis of coke were used to confirm the results.In addition,the feasibility of using briquette coking process to treat waste plastics has been further verified through the coking experiment of 2kg experimental coke oven.It has been found that the utilization of waste plastics can be resolved by using briquette coking method,which has less influence on the quality reduction of coke than that of bulk coal coking method.Therefore,it has obvious advantages for waste plastics to be used in briquette blending.