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1.阻塞原因及现状分析 某化肥厂重油裂解气化装置中有三台废热锅炉,主要用途是回收由重油气化炉产生的高温裂化气(H_2+CO)显热,使气体温度由1300～1350℃降到300～500℃。其结构为蛇形盘管锅炉,总传热面积为47m~2,正常情况下可产蒸汽9.36t/h,压力为5MPa,结构示意见图1。 此设备为立式筒体,内部有4根螺旋形盘管,高温气体由下面一个φ428×14mm的球形分配体分配到4根锅炉盘管中,自下而上分别沿直径为φ83×6、φ76×6、φ68×6、及φ60×5(尺寸单位为mm)的管流动,之后顺4根下降管至底部集气管流出。管材料下部为1Cr18Ni9Ti、上部为20g钢,价值约15万元/台。该
1. Obstruction Cause and Status Analysis There are three waste heat boilers in a fuel oil cracking and gasification plant of a fertilizer plant. The main purpose is to recover the sensible heat of high temperature cracked gas (H 2 + CO) produced by a heavy oil gasifier so that the gas temperature is increased from 1300 to 1350 ℃ down to 300 ~ 500 ℃. The structure of the serpentine coil boiler, the total heat transfer area of 47m ~ 2, under normal circumstances can produce steam 9.36t / h, the pressure is 5MPa, the structure shown in Figure 1. This device is a vertical cylinder with 4 helical coils inside. The hot gas is distributed to 4 boiler coils by a φ428 × 14mm spherical distributor below, with diameter of φ83 × 6 from bottom to top, φ76 × 6, φ68 × 6, and φ60 × 5 (the unit of dimension is mm), and then flow down the four down pipes to the bottom manifold. The lower tube material 1Cr18Ni9Ti, the upper part of 20g steel, the value of about 150,000 yuan / Taiwan. This