Feasibility Analysis of Syngas Production via CO2 Absorption Enhanced Gasifier for Ammonia Synthesis

摘要

An alternative process of syngas production for ammonia synthesis was proposed in this paper.Syngas is made of coal and coal mine gas(CMM)by CO2 absorption enhanced gasification.Due to higher N2 content in CMM,it is possible to remove N2 supplement section or to replace air gasification by steam gasification.With the in-situ absorption of CO2,the syngas compositions at gasifier outlet can meet the inlet contents criteria of syngas refinery section which should be φ(H2)/φ(N2)= 3 and φ(CO2+CO)< 0.30％.In order to analyze the feasibility and operation conditions of the proposed process,syngas production reactor was simulated by thermodynamic model,from which the variations of syngas compositions with operation parameters were studied.Based on this work,it is able to determine the suitable operation parameters for gasifier operation and corresponding CMM flow rate.Considering the explosion limits variation of pressurized CMM,the feasible parameters for O2 removal reactor operation was calculated.Analysis results indicate that it is feasible to produce syngas for NH3 synthesis by coal and CMM co-gasification with in-situ CO2 capture.Meanwhile,it is advantage to simplify components adjustment section and syngas purification section.