Coke tower cold coke temperature
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When the coke tower is used for cooling coke with water, there are three thermometers on the tower wall (from top to bottom: A/B/C). During one of the water supply operations, the temperatures at points A and B dropped rapidly, while the temperature at point C remained above 300 degrees. It was not until the water reached the overflow level that the temperatures at A and B fell below 100 degrees, whereas the temperature at point C in the lower part of the tower was still around 200 degrees. Why did this phenomenon occur? PS: 1. This phenomenon has occurred several times. 2. When water is supplied, utility sludge is injected.
Yes, the cold quench water is supplied from the bottom of the tower. Normally, the temperature at the bottom drops first, gradually approaching the temperature of water. But this phenomenon is hard to understand, even though the instruments show accurate readings.
If coking occurs at the thermocouple, as long as the water supply volume, time, and temperature meet the requirements and the temperatures at other points on the tower wall drop, it is possible to dissolve the coke or release water
If the bottom doesn’t cool down fully, the top of the tower will tilt, right? Generally, 50 tons are given to someone for 2 hours, and then the water volume is increased gradually. If the bottom has not cooled down fully, the time required at 50 tons/h can be appropriately extended; it is still possible to increase the water supply rate later on, so there is enough time. You can also speed up the release of water to get back sooner.
The high hardness of the coke at the bottom is caused by poor permeability; could it be that your coke formation cycle is relatively long, and excessive overflow leads to a decrease in this hardness?
The coking cycle lasts 24 hours, with the temperature at the furnace outlet being around 493 degrees. The water supply is initiated at a low rate and then increased over time; the total water supply duration is 3 to 4 hours. During the later stage when water is reduced and steam is increased, the temperature at the feed connection point exceeds 100 degrees, which is why it can be said that the thermocouple is functioning properly.
It’s likely that coking at the lower thermocouple is affecting the temperature changes; the poster can compare this with the level gauge. Does the temperature return to normal after the defocusing?
Each of our four feed streams has a capacity of around 35 t/h, with coking taking place 24 hours a day. Small feedwater: around 70-100 tons over 4 hours; large feedwater: 500 tons per hour for a total of 5 hours