在投油稳燃时，运用上层油枪，使得上层一次风处热负荷会集，锅炉鼓风机部分炉温高，到达灰熔点，致使锅炉结焦。
In the oil combustion, using top gun, the upper wind at a heat load of boiler blower gathered, part of the furnace temperature is high, reaching the ash melting point, resulting in boiler coking.
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