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某铁合金厂为保护环境和节约能源.利用高炉煤气发电,锅炉型号为QC22-20-2.45/400(配3000kW汽轮机机组),设计给水温度105℃,预热空气温度262℃,排烟温度172℃,累计连续运行68000h。2004年初发现炉墙前、左、右3面轻微裂纹变形,2005年发现炉墙有多处较严重裂纹变形,测量炉墙温度在60～85℃,高于锅炉炉墙设计温度(要求低于40℃)。 1 炉墙存在的问题停炉检验发现:裂纹变形主要集中在炉膛高温区(4800～8600mm)内外表面,对流管束区有少量裂纹,如图1所示。
An iron alloy plant to protect the environment and save energy.Using blast furnace gas power generation, the boiler model is QC22-20-2.45 / 400 (with 3000kW turbine unit), the design feed water temperature of 105 ℃, preheated air temperature of 262 ℃, exhaust temperature of 172 ℃ , A total of 68000h continuous operation. In early 2004, a slight crack deformation was found on the front, left and right sides of the furnace wall. In 2005, there were many more serious crack deformations in the furnace wall. The temperature of the furnace wall was measured at 60-85 ° C, which was higher than the boiler wall design temperature 40 ° C). A furnace wall problems Shut down test found that: crack deformation is mainly concentrated in the furnace high temperature zone (4800 ~ 8600mm) inside and outside the surface, convection tube bundle area has a small amount of cracks, as shown in Figure 1.