The effect of the oxide layer. On the one hand, the oxidation layer reduces the wall thickness of the 12Cr1MoV steel pipe, on the other hand, the heat transfer ability of the oxide layer is poor, which leads to the increase of the 12Cr1MoV steel pipe temperature and the deterioration of the material structure. The thinning of the wall thickness and the deterioration of the structure lead to the decrease of the bearing capacity of the 12Cr1MoV steel pipe.
The effect of blockage. When plugging the pipe to a certain extent, the water vapor flow in the pipe decreases and the heat taken away by the steam decreases, which causes the temperature of the 12Cr1MoV steel pipe wall to rise, the strength of the pipe to decrease, and the load carrying capacity of the 12Cr1MoV steel pipe to decrease. The temperature of the pipe increases to the same level as the flue gas, and the deterioration of the 12Cr1MoV steel pipe tissue accelerates when the plugging material causes the complete plugging of the pipe. The inlet temperature of furnace is 700℃, and the temperature of heat transfer tube of 12Cr1MoV is less than 580℃. The excessive temperature makes the material structure deteriorate, lamellar pearlite spheroidization, and the heat transfer 12Cr1MoV steel pipe high temperature bearing capacity decrease, finally. Causes high temperature overload cracking. The temperature at the inlet of the furnace is the highest, and the heat transfer 12Cr1MoV steel pipe at the inlet is most likely to crack.
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