Delayed coking heater
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It is a delayed coking heater with a capacity of 1 million tons per year. Since it was put into operation, the feed rate for each stream is 22 tons per hour. However, in order to maintain the outlet temperature, the fuel gas flow rate for streams 1 and 3 is 200 KG/hour, while that for streams 2 and 4 is 450 KG/hour. There are also significant differences in the furnace temperature and the pressure at the furnace inlet. The outlet pressure of the radiation pump is 2.2 MPa. I believe this represents a phenomenon of uneven flow; despite multiple adjustments, this issue has not been resolved. Could everyone please help analyze this situation?
Why isn’t anyone replying? Are they all too busy to respond? :'(
I want to know that too~~ Waiting for petrochemical equipment
1. How long has the project been in progress? Considering the degree of coking in the furnace tubes. 2. The gas consumption for the four feed paths differs by more than a factor of two; what is the status of burner adjustment on site? Check whether there is a fuel gas leak or blockage in the individual burner. 3. There is a large difference between the furnace temperature and the pressure at the furnace inlet, resulting in severe uneven gas consumption; the fire issue on site is likely significant. 4. Given this situation, the coking conditions in the four channels must differ, and it is necessary to determine whether the readings from the flow meters in these four channels are accurate. I am but an unskilled person; I have been away from coking production for over a year now. For reference only.
It is a delayed coking heater with a capacity of 1 million tons per year. Since it was put into operation, the feed rate for each stream is 22 tons per hour. However, in order to maintain the outlet temperature, the fuel gas flow rate for streams 1 and 3 is 200 KG/hour, while that for streams 2 and 4 is 450 KG/hour. There are also significant differences in the furnace temperature and the pressure at the furnace inlet. The outlet pressure of the radiation pump is 2.2 MPa. I believe this represents a phenomenon of uneven flow; despite multiple adjustments, this issue has not been resolved. Could everyone please help analyze this situation? 1. You have set the outlet pressure of your radiation pump at 2.2 MPa. Is this the designed pressure, or have you reduced the frequency conversion to such a low level in order to save energy and reduce consumption? ? ? , or what else? ? 2. The most crucial question is: why is the fuel gas control for your heating furnaces different? Isn’t it just a furnace? In this way, coking of the furnace tubes due to uneven heating will be severe. 3. Through what sensation do you experience the flow? ? ? ? The offset-flow heating furnace should be the most obvious; the flow rate should be quite apparent, whether it’s in terms of fuel gas, air supply, steam injection, temperature, pressure, and so on – these are all very clear indicators. (Could you please provide information on the differences in relevant temperatures and pressures?) 4. This kind of problem is quite troublesome. First, you need to address the issue of coking in the furnace tubes; by tackling it from this perspective, you can avoid serious problems in future production. Also, how long are your furnace tubes? ? This requires calculating the residence time to see if the furnace tubes are indeed coking, and also to understand why there is such a large deviation in your fuel gas ? ? ? ? ? ? ?
Another question: are your coking heaters of single-pass or double-pass type? ? Is it a two-pass system? It is only when one of the flow paths cannot be controlled properly and causes coking and flow deviation that the fuel gas ends up being uneven in volume on one side. You need to deal with it quickly.
It could be a problem with the air volume adjustment for circuits 2 and 4; try reducing the fuel gas flow for these circuits, and then reduce the air volume accordingly to see if that helps.
I’ve studied it*, but I’ve never been exposed to coking
During this shutdown period, mechanical coking removal was carried out on the coking furnace; such a situation had not occurred before the plant resumed operation. This phenomenon started appearing after the coking was removed. The furnace is of double-radiation type, with two furnace tubes in each chamber
During this shutdown period, mechanical coking removal was carried out on the coking furnace; such a situation had not occurred before it was restarted. This phenomenon started appearing after the coking was removed. The furnace is of the double-radiant type, with two furnace tubes in each chamber. After restarting the furnace, we added an inverter for the radiant pump. Previously, the outlet pressure of the radiant pump was 4.6 MPa; however, since the processing capacity is only 22 tons per hour, the outlet pressure of the radiant pump is now kept at around 2.2 MPa
The feed rate is too low. Can we be sure of the accuracy of the flow meter?