Study On Combustion Characteristics Of Premixed Flame Of Ammonia-methane

Environmental problems caused by climate change have attracted more and more attention,and the burning of fossil fuels is one of the main causes of air pollution.It is becoming more and more important to find a clean energy that can replace fossil fuels.Natural gas is a kind of clean energy.Its main fuel is methane.It has the advantages of less impurities,economical benefits and high combustion efficiency.Therefore,it is widely used as industrial gas,city gas and engine fuel,but its combustion products contain a large amount of carbon oxidation It will still aggravate the greenhouse effect.Ammonia is a new type of clean energy with good application prospects.Its energy density is high and the combustion products do not contain carbon oxides.Therefore,the use of ammonia-methane can reduce the emissions of nitrogen oxides and carbon oxides.Research on ammonia-methane is of great significance to solve the problem of energy shortage and reduce pollution emissions.In this paper,a premixed laminar flame burner is designed for the premixed flame of ammonia methane mixed fuel,and a combustion test platform is built based on this burner.The effects of combustion characteristic parameters such as total flow,methane ratio and equivalence ratio on blow-out limit,methane lean limit and lean /rich combustion limit are tested,and the combustible range that can keep the flame burning under different working conditions is determined The lean limit and lean /rich combustion limit of methane were simulated by three reaction mechanisms in CHEMKIN.This paper takes the ammonia-methane premixed flame as the research object,designs a premixed laminar flame burner,and builds a combustion test platform based on this as the core,and tests the combustion characteristic parameters such astotal flow,methane proportion and equivalent ratio to blow-out The influence of the limit,the lean limit of methane and the lean/rich limit determines the combustible range that can maintain the flame under different working conditions.The energy stored in the fuel is always released in the form of light and heat in the flame during combustion,so the study of the light and heat of the flame can reflect the energy characteristics of the fuel combustion.In this paper,the effects of combustion parameters on the chemiluminescence intensity of flame recorded by ICCD camera are studied.The experimental results show that the increase oftotal flow,the decrease of methane proportion and the increase of equivalence ratio will increase the intensity of flame chemiluminescence.In this paper,the thermocouple fixed-point temperature measurement method and the two-dimensional plane flame temperature measurement method of infrared thermal imager are used to measure the flame temperature,and the infrared temperature measurement results are calibrated by the thermocouple temperature measurement results.It is found that the two methods have good consistency with the change of thetotal flow.Then,the relationship between flame chemiluminescence intensity and flame temperature is analyzed.It is found that the variation trend of flame chemiluminescence intensity and thermocouple temperature measurement results is the same as that of three combustion characteristic parameters,that is,the light and heat generated by premixed combustion of ammonia-methane has a positive correlation with the change of combustion characteristic parameters.