Optimization Simulation Of Waste Pyrolysis And Gasification Incinerator

With the growth of China's population and the accelerated process of urbanization,the environmental problems caused by the large increase in the production of municipal solid waste are becoming more and more serious.Sanitary landfill,as the main waste disposal method in China,has been unable to meet the current waste treatment,and is faced with the problem of no land availability and waste of resources.Waste pyrolysis and gasification incineration is a new kind of incineration technology.This technology not only can save auxiliary fuel and emissions of flue gas is relatively clean,at the same time with traditional incineration,pyrolysis and gasification of the heat generated after incineration of recyclable used for power generation heat production industry,is considered to be the main way of future waste disposal in china.It is of great significance to study the characteristics of pyrolysis and gasification of waste and to optimize the pyrolysis and gasification incinerator,both in energy conservation and in the environment.Firstly,through the Aspen Plus software of garbage in the pyrolysis and gasification incineration furnace combustion chamber in the pyrolysis and gasification characteristics were simulated,to discuss the influence of excess air coefficient,gasification temperature on the composition and gas waste in the pyrolysis process of the thermal conversion rate and carbon conversion rate.The simulation results show that the excess air coefficient is between 0.3-0.4,and the gasification temperature is between 600 ? and 700 ?,which is conducive to the overall operation of pyrolysis gasifier.By using CFD software Fluent on pyrolysis and gasification incineration furnace two combustion chamber was simulated,based on the two combustion chamber entrance design of three structures,respectively,from the side of the center of flue gas side and the top two tangential center into the combustion chamber through the simulation analysis of the influence of different structure of flue gas entrance flue gas velocity and temperature,obtained from flue gas the side to cut into the two chamber,two chamber temperature is relatively high,especially at the center of the high-temperature region covering almost the entire section,to ensure the harmful substances such as dioxin is fully cracked,and the flue gas from the side to cut into the flue gas in the combustion chamber of the flow around the two degree,exercise time,the flue gas can be fully burned.So in the side tangential entrance on the structure optimization,increase spiral device,set up three kinds of different guide vane conditions,analysis of the influcnce of different vane number on the flue gas characteristics,the guide vane number is 8 under the condition that the longer motion path of flue gas,in the two chamber around the mixed fully,better combustion effect.Finally,according to the two burning two indoor air ratio is analyzed,the design of 4 kinds of simulation condition with different air ratio two times,respectively 1:2,2:3,1:1,2:1,the condition changes of the design is from 1 to 4 working conditions,an air flow and two air volume decreased.The simulation results show that with the decrease of oxygten contcent,the concentration of harmful substances such as CO and H2 will decrease.If we want to ensure that the two combustion of the two combustion chamber plays a role,the ratio of the one or two times of the wind will be about 2:3.