一、前言 高炉炉顶压力控制,对保证高炉炉况稳定,高炉的顺行、高产、优质、低耗起重要作用。当前,我国大中型高炉炉顶压力控制,都是由高炉炉顶压力直接控制减压阀组(SV)的φ400自动蝶阀来实现的(参见图1)。为使φ400蝶阀始终在较好的线性段工作,高炉炉长在蝶阀偏离正常位置(约45°)时,就立即手动操作φ750蝶阀(打开或关闭一点),以控制φ400蝶阀回到原来位置上,从而保持压力稳定。 I. INTRODUCTION Blast furnace top pressure control plays an important role in ensuring stable blast furnace condition, smooth blast furnace, high yield, high quality and low consumption. At present, the pressure control of the large and medium-sized blast furnace roof in our country is realized by the φ400 automatic butterfly valve which directly controls the pressure reducing valve (SV) of the blast furnace top pressure (see Fig. 1). In order for the φ400 butterfly valve to always work in a better linear section, the blast furnace burner is operated manually with the φ750 butterfly valve (open or closed) to control the φ400 butterfly valve to its original position when the butterfly valve deviates from its normal position (approx. 45 °) , Thus keeping the pressure steady.