Influence of Sinter Parameters on CO Emission in Iron Ore Sintering Process

Abstract

Carbon monoxide is the major hazardous component in flue gas exhausting from the iron ore sintering. This study aims to reduce the CO emission by changing the sinter parameters by sintering pot tests; specifically, the sinter quality, CO concentration, and total emission in sintering flue gas were analyzed in detail. The sinter strength properties, including the shatter index and the tumble index, are analyzed by the sintering pot test and the sintering flue gas discussion. The results show that the CO emission can be suppressed by modifying the sinter parameters, such as carbon content, coke breeze and coal breeze ratio, water addition, and sintering negative pressure. The good sinter parameters with the lower CO emission are 2.8% carbon content and 7.5% water in the sintering mixture. A higher coke breeze to coal breeze ratio, or only coke breeze fuel in the sinter mixture, is beneficial for the lower CO emission with a negative fan pressure of −12 kPa.

Research on Multi-Decision Sinter Composition Optimization Based on OLS Algorithm

“…In order to explore the relationship between raw material adjustment and sinter composition, the OLS algorithm was used to fit the change in sinter composition when each raw material was changed. A model with coefficients is fitted to the influence of a raw material ratio change on the sinter composition in the material change scheme so that the residual sum of squares between the actual observed data and the predicted data (estimated value) of the data set is minimized; see Formula (1). For this unary linear regression model, an array of observations is obtained from the population, and for the n points in the plane, a curve is used for fitting, and the fitted curve is used to adjust the relationship between a raw material and sinter composition between changes (see Formula (2)).…”

“…Sintering is a very complex process requiring the control and optimization of about 500 parameters to ensure high sintering quality. Reasonably adjusting the amount of raw materials such as iron, coke, and anthracite can reduce costs and pollution emissions [1][2][3]. At present, the enterprise ore blending requires that the error of the main elements be within 0.01, and the error of the rare elements be within 0.001, so as to ensure that the slag can meet the production requirements.…”