The influence of H2O （g） content in circulating flue gas on sintering was studied by simulating the flue gas circulating sintering. The results show that the burning speed of solid fuel and the heat transfer rate du...The influence of H2O （g） content in circulating flue gas on sintering was studied by simulating the flue gas circulating sintering. The results show that the burning speed of solid fuel and the heat transfer rate during sintering process are improved when the H2O （g） content increases from 0 to 6%, which accelerates the sintering speed. However, when the H2O （g） content exceeds 6 %, the over-wet zone in sinter bed is thickened, which deteriorates the permeability of sintering bed. In addition, the magnetite content in sinter increases, while the acicular calcium ferrite content decreases. Accordingly, the sinter yield and tumble index decrease with excessive H2O （g） content. To guarantee the yield and quality of sinter, the favourable H2O （g） content in circulating flue gas should be controlled to be less than 6%.展开更多
Circulating flue gas can reduce the emission of flue gas , and furthermore , it can reuse the waste heat effectively in the sintering process.Compared with conventional sintering , O2 that gets through the sintering b...Circulating flue gas can reduce the emission of flue gas , and furthermore , it can reuse the waste heat effectively in the sintering process.Compared with conventional sintering , O2 that gets through the sintering bed decreases because of substituting circulating gas for air.The influences of O2 content on sintering process are studied through simulating the flue gas circulation sintering with artificial gas.It shows that , with the reducing of O2 content in circulating gas , the combustion speed of fuel decreases and incomplete combustion degree increases , which makes the flame front fall behind the heat front and reduces the heat utilization efficiency of fuel.The ultimate result is that the temperature of sintering bed decreases and the liquid phase reduces.In addition , the reducing atmosphere is strengthened because of flue gas circulation , which makes the magnetite increase yet calcium ferrite reduce gradually. Because the content of calcium ferrite with good strength reduces , the sinter yield and tumble strength decrease.To ensure the sinter index , the favorable O2 content of circulating flue gas is no less than 15%.展开更多
基金Item Sponsored by National Natural Science Foundation of China(51174253)Graduate Student Innovation Projects of Central South University of China(2014zzts276)
文摘The influence of H2O （g） content in circulating flue gas on sintering was studied by simulating the flue gas circulating sintering. The results show that the burning speed of solid fuel and the heat transfer rate during sintering process are improved when the H2O （g） content increases from 0 to 6%, which accelerates the sintering speed. However, when the H2O （g） content exceeds 6 %, the over-wet zone in sinter bed is thickened, which deteriorates the permeability of sintering bed. In addition, the magnetite content in sinter increases, while the acicular calcium ferrite content decreases. Accordingly, the sinter yield and tumble index decrease with excessive H2O （g） content. To guarantee the yield and quality of sinter, the favourable H2O （g） content in circulating flue gas should be controlled to be less than 6%.
基金Item Sponsored by National Natural Science Foundation of China ( 51174253 )Fundamental Research Funds for Central Universities of China ( NCET-05-0630 )Graduate Student Degree Thesis Innovation Foundation of Hunan Province of China (1343/74333001114)
文摘Circulating flue gas can reduce the emission of flue gas , and furthermore , it can reuse the waste heat effectively in the sintering process.Compared with conventional sintering , O2 that gets through the sintering bed decreases because of substituting circulating gas for air.The influences of O2 content on sintering process are studied through simulating the flue gas circulation sintering with artificial gas.It shows that , with the reducing of O2 content in circulating gas , the combustion speed of fuel decreases and incomplete combustion degree increases , which makes the flame front fall behind the heat front and reduces the heat utilization efficiency of fuel.The ultimate result is that the temperature of sintering bed decreases and the liquid phase reduces.In addition , the reducing atmosphere is strengthened because of flue gas circulation , which makes the magnetite increase yet calcium ferrite reduce gradually. Because the content of calcium ferrite with good strength reduces , the sinter yield and tumble strength decrease.To ensure the sinter index , the favorable O2 content of circulating flue gas is no less than 15%.
