Study On Oxygen-Deficient Combustion Characteristics Of Regenerative Staged Flat Flame Burner

Heating furnace is one of the core equipment in iron and steel industry.As a high energy-consuming equipment,it is the main source of atmospheric pollutant emission.In view of the improvement of national emission standard of atmospheric pollutants,how to reduce NOx emission from heating furnace flue gas in metallurgical industry has become one of the hot research topics.By optimizing combustion technology,investment in denitrification equipment and consumption of denitrification agents can be avoided after the generation of NOx,making high-efficiency and low-pollution combustion technology become the focus of the hot spot.For this reason,this paper proposes a combustion technology that reduces NOx emissions at the expense of combustion efficiency.The essence of this technology is that the fuel does not meet the required amount of air for theoretical combustion.Through numerical simulation and experiments,this paper studies the impact of oxygen-deficient on pollutant emission characteristics during combustion.The specific research content is as follows:In terms of numerical research,in order to evaluate the impact of under oxygen combustion on the combustion and pollutant emission characteristics of the combustor during its operation,the core components and systems of the combustor were designed based on enterprise requirements,and a new type of regenerative flat flame staged combustor was determined.Based on a non-premixed combustion model,a turbulence model,and a pollutant emission model,a numerical study was conducted on the combustion characteristics of a newly designed combustor and its corresponding experimental furnace.The main variable parameters were excess air coefficient,fuel classification ratio,and air preheating temperature.The research results show that:1)Keep other parameters unchanged and change the excess air coefficient.When the excess air coefficient is 0.96,the NOx concentration in the flue gas reaches the minimum value of about 75 mg/m~3;2)Keep other parameters unchanged and change the fuel grading ratio.When the fuel grading ratio is 8:2,the NOx concentration in the flue gas reaches the minimum value of about 67 mg/m~3;3)Keep other parameters unchanged and change the air preheating temperature.When the air preheating temperature is 500 K,the NOx concentration in the flue gas reaches the minimum value of about 95 mg/m~3;In terms of experimental research,the combustion scheme and burner were tested using a test platform built by a metallurgical gas industrial furnace research institute.Applying this new type of burner in an oxygen-deficient combustion atmosphere,it was able to test that the NOx emission under specific conditions was reduced from the usual220 mg/m~3 to 95 mg/m~3,which is lower than the emission standard of 100 mg/m~3 in the Beijing Tianjin Hebei region Tianjin DB12/556-2015"Air Pollutants for Industrial Kilns".In general,this article has conducted theoretical and experimental research on a scheme to reduce the NOx content in flue gas through oxygen-deficient combustion.The research results have proven the feasibility of this scheme,providing a new idea for the technical transformation of low NOx emissions in gas industrial kilns.