Methods for determining coking in the furnace tubes of delayed coking heaters
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How to determine if the furnace tube is coked?
Flow rate decreases, pressure difference increases, temperature drops
The flow rate decreases, the pressure difference increases, and the heat exchange efficiency drops.
The pressure drop is the most obvious indicator; next, the furnace temperature is higher than before
1. Pressure difference before and after the furnace tube. 2. Furnace tube wall temperature. 3. Gas consumption and furnace temperature. 4. The color of the furnace tube: red or with a white coating.
It can be roughly determined based on the pressure drop and flow rate at the furnace inlet and outlet
Check the color of the furnace tubes, as well as the pressure difference before and after the furnace tubes, and the temperature changes in those areas
1. With unchanged operating conditions, the radiation inlet pressure increases while the radiation outlet pressure decreases. 2. With unchanged operating conditions, the temperature of the furnace tubes and the furnace chamber rises; the furnace tubes gradually change from pink to black, and spots may appear; the hangers change from a warm red color to white. 3. The amount of fuel gas used increases. 4. The response of the radiation outlet temperature is slow