我厂用单、双程升膜式长管蒸发器蒸发黑液,管子规格为φ57×3.5,L=7000毫米.为了减少积垢,多采用扩管翻边的方法将管子紧固在孔板上。在现场换管时我们采用了如下方法. 首先将管口边向里卷,再在管头施加压力将管子从下端孔板中打出,最后将管子割断取出. 将新管两端用砂布抛光30～50毫米,从蒸发器顶部把管子放入上、下孔板中,管子两端留出翻边长度4～6毫米.为了使管子定位准确,便于扩管翻边,我们设计了一个简单适用的紧管器(如图).使用时先将 I plant with single, double-liter or long-film evaporator evaporation black liquor, pipe specifications for φ57 × 3.5, L = 7000 mm. In order to reduce fouling, the use of expanded tube flange method to the tube fastening plate on. We used the following method to change the pipe at the scene: Firstly, the nozzle was curled upside down, and then pressure was applied to the pipe to eject the pipe from the lower orifice plate, and finally the pipe was cut off and polished at both ends of the new pipe with abrasive cloth 30 ~ 50mm, the top of the evaporator tube into the upper and lower orifice plate, leaving both ends of the tube flange length of 4 ~ 6 mm. In order to pipe positioning accuracy, easy to flare flange, we designed a simple application (Figure). When using first