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平炉风机需要根据生产工艺要求经常调节风量和风压。湘钢2号平炉一次风机原采用送风管道蝶阀控制调风量,调节过程中产生较大的节流损失,风机在低负荷运行中伴有较大的喘振声。 1991年8月,湘钢使用了专利产品预旋器调节风机风量,改变进口预旋器的导流叶栅角度,促使进气形成旋流场,气流顺叶轮方向进入风机,减少气流阻力,提高风机效率。风机风量可自如地无级调节,获得宽广稳定的工作区,运行可靠,操作简便,维护简单,节电效果显著,半年左右可回收投资。经测试,风机耗电量由1.59kWh/t钢降为1kWh/t钢,节电率达37％。
Open hearth fans need to regulate the air flow and pressure regularly according to the requirements of the production process. For the first time in Xiangtan Iron and Steel Furnace No. 2, the blower used the butterfly valve of the air supply pipe to control the air volume, resulting in a large throttling loss in the adjustment process. The fan had larger surge sound during the low-load operation. In August 1991, Xianggang Steel used a patented product pre-rotating device to adjust the air volume of the fan and change the angle of the guide vane of the imported pre-rotating device to promote the formation of a vortex flow. The air flow enters the fan in the direction of the impeller to reduce the airflow resistance and increase Fan efficiency. Fan air volume can be freely stepless adjustment, access to a broad and stable work area, reliable operation, easy operation, easy maintenance, energy-saving effect is remarkable, about six months can be recycled investment. After testing, the fan power consumption from 1.59kWh / t steel reduced to 1kWh / t steel, saving rate of 37%.