Study On Utilization Of Gasification Based On Source-collected Combustible Solid Waste

With the exploited resource and energy exausted and with the economic developing and living standard improving,the municipal solid waste volume is increasing largely.The living garbage total volume of our country has been aforecited all over the world,thus it is a very difficult problem to reasonably deal with and effectively utilize this misplaced resource.Currently,the main thermal treatment method of living garbage is incineration method because it has the advantage of losing volume and weight,but the government puts forward the strict restriction to the pollution emission of incineration method.Nowadays,the gasification method has replaced the incineration method gradually,and the chief research direction is how to effectively centralize the high calorific value and combustible substances of the garbage.Under this background,in this thesis,we classified the municipal solid waste from source and effectively centralized the dried and organic combustible solid waste and analyzed air gasification gas volume percentage and gas characteristic from simulation and experiment aspects under standard pressure.Firstly,using Aspen Plus software and based on the minimum Gibbs free energy principle,we established the gasification model to predict the factor trend of source-classified waste gasification reaction and analyze the influence of ER and preheated temperature to the gasification temperature,gasification gas volume percentage and gasification characteristic parameters.We concluded that the gasification temperature became higher wih ER value increasing,and to the calorific value of 21010kJ/kg source-classified waste,ER value being 0.4 or larger than 0.4 could satisfy the demand of gaification temperature higher than 600℃;pre-heated temperature had little effect on gasification temperature improving,and the gasification temperature went up linearly wih pre-heated temperature higher and the pre-heated temperature went up every 100℃ could cause the gasification temperature up about 10℃.Then we simulated the trend of source-classified waste gasification volume percentage and gasification characteristic change under different ER value and gasification temperature condition.Secondly,due to the complicated components of municipal solid waste,it’s difficult to use one kind of garbage sample to represent all the garbage.To make the research more representative,under the changing working condition of gasification(air equivalent ratio and gasification temperature),the Aspen Plus software platform is applied to simulate the gasification gas volume of the sampled components(single-component materials:paper,cloth,plastics)and their variation trends of gasification characteristic parameter.Using the fluid-bed gasification experiment platform,choosing representative materials(paper,saw dust and source-classified waste),carrying out the experiment under the changing working condition of gasification,comparing and verifying the experiment results and simulated results,it is found that the simulated value can match the experiment value well.Finally,taking bauxite with average particle diameter from 60 mesh to 80 mesh as the bed material,the fluidized air velocity is set at 0.36m/s according to the cold experiment,the fluidized airflow is set at 8m3/h,a series of mixed components gas gasification experiments under standard pressure are carried out,and the influence of the four factors including air equivalent ratio,gasification temperature,catalyst ratio and material component over gasification gas volume and gasification characteristic parameter including calorific value,yield rate,efficiency and carbon conversion has been analyzed.