저 발열량 석탄가스연료의 연소특성에 관한 실험적 연구
Experimental study on the combustion characteristics of low calorific value(LCV) coal gas fuel
iii, 49 p.
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The present study has been made for investigating the fundamental characteristics of the flame behavior and the NOx emission ofcoal-derived low/medium Btu gas fuel combustion that would be very helpful for the design and the modification of gas turbine combustor for IGCC(Integrated Gasification Combined Cycle) application. Firstly, erperimental studies are conducted to investigate the flame stability and the thermal/fuel NOx formation characteristics of the premixed combustion of low calorific value (LCV) coal derived gas fuel. Synthetic LCV fuel gas is produced by mixing carbon monoxide, hydrogen, nitrogen and ammonia on the basis that the thermal input ofthe syngas fuel into a burner is identical to that of natural gas. The syngas mixture is fed to and burnt with air on flat flame burner. With the variatioil of the equivalence ratio for specific syngas fuel, flame behaviors are observed to identify the flame instabilittr due to blow-off or flashback. and to define stable combustion range. Measurements of NOx content in combustion gas are made for comparing thermal and fuel NOx from the LCV syngas combustion with those of the natural gas one. In addition, the nitrogen dilution of the LCV syngas is preliminarily attempted as a NOx reduction technique, and its effects on thermal and fuel NOx production are discussed. As the sifcond research program, swirling diffusion burner test is carried out with the raw coal gas fuel produced from the 3 ton/day BSU(Bench Scale Unit) coal gasifier system of Institute for Advanced Engineering Varying the air/fuel ratio and the swirl angle of air in the burner, the NOx emission level and the flame shape are measured and then the measured results show that NOx emission level is more remarkably influenced at higher equivalence ratio and an optimum swlrl angle exists for rapid mixing of air and fuel and shortening of flame height.