Research On The Experimental And Kinetic Model Of Partial Oxidation Reforming Coke-oven Gas

The coke-oven gas is a by-product from coking plants during the production of blast furnace coke.Besides CO and H₂,this product gas always contains large amount of higher hydrocarbons like methane, benzene and naphthalene.With the development of the coke industry,a large amount of the coke-oven gas has not been utilized properly,leading to environmental pollution and resource wasting.Reforming coke-oven gas into synthesis gas,which can be used as metallurgical reduction gas or raw material for the production of chemicals,such as methanol or ammonia etc.,is a promising technology.Before the use of the product gases,hydrocarbons should be converted.Partial oxidation -reforming is an effective way to reform coke-oven gas,but the kinetic behavior needs intensive study.On the basis of investigation on the thermomechanics of reforming coke-oven gas,for non-equal phase system including solid carbon, hydrogen,oxygen and inert gas,an iteration method of calculating phase equilibra composition was proposed.Equations of chemical equilibrium and material balance were converted in to mathematical equation, nonlinear equation was resolved with Newton interactive method. Equilibra composition of non-equal phase was calculated.The experiments of reforming the methane of coke-oven gas with partial oxidation were performed.The effects of the factors such as the mol ratio of(CO₂+H₂O)and CH₄,methane conversion temperature(T)and ratio of O₂ in the reactor on methane conversion rate were investigated. Especially,the kinetic datum of the varies reaction conditions were obtained,and the dynamic model of methane conversion was proposed and verified.All results demonstrat that the calculated value by the dynamic models agrees with the experiment date well,the error is less than 1.5%.The results of research reveal the optimal dynamic conditions for methane conversion.The(CO₂+H₂O)/CH₄ ratio varies within 1.1～1.3, the conversion temperature varies within 1223～1273 K and the ratio of O₂ is about 6%.The methane conversion rate is more than 95%.