TG-FTIR Analysis Of Co-pyrolysis Characteristics Of Refuse Derived Fuel And Lignite

The heat treatment is not suitable for Municipal Solid Waste(MSW)because of its easy corruption and bad odor.However,it has the advantages of high calorific value,stable combustion,low secondary pollution and low emissions of dioxins by sorting,crushing,drying and processing into Refuse Derived Fuel(RDF).Nowadays,lignite has not been used effectively for a long time.The study on the co-pyrolysis of RDF and lignite can improve the economic efficiency of resources and alleviate a series of problems caused by "rubbish siege".It is also conducive to the comprehensive utilization and development of energy.The main contents and research results are summarized as follows.RDF and lignite elements were determined by Proximate and ultimate analysis.The pyrolysis process of RDF at different heating rates and different mass ratios could be divided into three stages:biomass components pyrolysis(173?433?),plastic materials pyrolysis(402?566?)and inorganic carbonate pyrolysis(>650?).Inorganic carbonate in the sample could be removed by pickling.The kinetics of the co-pyrolysis process was analyzed by the model method(Coats-Redfem)and model free method(Friedman,FWO and KAS).The activation energy of plastic materials pyrolysis was higher than that of the biomass component pyrolysis.According to the parallelism,the fitting curves of Friedman,FWO and KAS model-free method could be divided into three categories:?=0.1,?=0.2?0.6 and?=0.7?0.9.The parallel fitted lines had similar kinetic properties and reaction mechanisms.Coats-Redfern model could be used to calculate the average activation energy at different stages.Friedman,FWO and KAS model-free methods are closer to the real pyrolysis reaction mechanism.From the three-dimensional infrared gas-products and their release characteristics,it found that H2O,CO2,CO and CH4 were the main gases in the first stage.CH4 and CO2 were the main gases in the second stage and CO2 and CO were the main gases in the third stage.Light gases(CO2,CH4 and CO)reflected a bimodal characteristic.CO2 was released in the period of the low temperature(200?300 ?)and the high temperature(600-800?)while CO was released in the period of the low temperature(300?400 ?)and the high temperature section(600-800?).However,CH4 was released in the period of the middle temperature(300?600?).There was a synergistic effect between the co-pyrolysis of RDF and lignite.The lignite was catalyzed by the alkali metal element in RDF.The catalytic performance of alkali metal K was stronger than Na.Alkali metal salts(K,Na)promoted the catalytic cracking of semi-volatile organics(C = O and C-O-C)which integrated to produce CO2 and CO.