Based on flame direct impact heat flux model with Gaussian distribution, combined with characteristics of direct flame impingement heating burner, the arrangement of the burner and the position relationship with strip steel, the air burning compensation heat was applied to strip steel in a sidewall-like radiation, and the transverse line heat flow distribution model of the strip was established. According to this model, the influences of natural gas flow reduction changes of the edge burner on heat flow rate of transverse line of the strip were analyzed. With the optimization goal of the uniformity of the distribution of linear heat flow in width direction of the strip steels, the natural gas flow control technology of the burner at the edge of direct fire heating sections was developed. By applying this technology to production practice, the natural gas flow rate may be adjusted according to the optimal reduction factor, and the natural gas flow rate setting value suitable for the edge nozzle and the middle nozzle when the strip steels were heated with different widths may be obtained. Taking the typical widths of 1300 mm, 1100 mm and 900 mm as examples, when the flow rate of a single burner in the middle is as 12.6 m3/h, 12.1 m3/h and 11.8 m3/h, the optimal reduction coefficients are as 0.89, 0.78 and 0.65, respectively, and the flow rate of a single burner at the edge is as 11.21 m3/h, 9.44 m3/h and 7.67 m3/h, respectively. Thus, the strip steels in the furnace are evenly heated laterally, the temperature distributions of the strip steels in width direction meet the production demands, and the stability of the strip operation in direct fire heating furnace is greatly improved.
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