Plasma Ignition And Combustion Enhancement Of Low BUT Fuel Technology

With the rapid development of China's economy,the demand for energy is increasing.Therefore,it is necessary to develop a substitute for primary energy.A large amount of blast furnace gas produced in blast furnace ironmaking can solve this problem.However,the blast furnace gas belongs to a kind of low heat value gas fuel,which is difficult to ignite with poor combustion stability,and it is prone to flameout.Equilibrium plasma ignited and enhanced combustion technology has the advantages of short ignition delay time,high ignition energy,and active combustion,which can improve the ignition reliability and combustion stability of the low-heat value gas.In this paper,firstly,the combustion process of blast furnace gas under plasma-combustion conditions is analyzed,and then the reaction mechanism is simplified in a one-dimensional reactor.Next,the 100 kW microturbine combustion chamber is taken as the object of the research.By using the numerical simulation after adding the dual fuel nozzle,the combustion chamber structure was improved and optimized.The combustor combustion performance of plasma combustion and ignition under different boundary conditions was also studied.The main contents of this paper are as follows:(1)Analyze plasma ignition and combustion characteristics of low-heat value blast furnace gas using a closed?uniform and completely mixing reactor model in the chemical kinetic software CHEMKIN.The results show that the ignition delay time is shorten and the chemical reaction process is accelerated with the active oxygen atoms;Through the sensitivity analysis,the GRI3.0 mechanism is simplified to a 19-step reaction mechanism.And the reliability of the simplified mechanism is verified.(2)Take the 100 kW microgas turbine combustion chamber as the research object,and perform the structural modification based on a combustion chamber equipped with a dual fuel nozzle.Next,the numerical simulation method is used to study the combustion flow field of the prototype and the improved combustion chamber,make sure the boundary conditions of the fuel inlet are 0.12 kg/s.Then,analyze the strengthening effect of plasma combustion on the combustion chamber.The results show that when the concentration of active particle O is2%,the combustion efficiency increases from 97.7% to 99.5%,so the effect of enhanced combustion is achieved.(3)The head of the geometry model is simplified based on the optimized combustion chamber and the ignition position is determined.The optimal parameters are determined by the study of igniter performance parameters.The results show that when the plasma is ignited,the ignition energy is 10 J and the ignition duration is 10 ms;when ignited is at high energy,the ignition energy is 160 J and the duration of ignition is 20 ms.