Within the first 120 hours of operation of the GE gasifier, the dome temperature and the temperature difference between the inlet and outlet of the burner cooling water were on the high side
Thread Content
At the beginning of feeding material into the gasifier, the dome temperature is 20-30 degrees higher than normal, and the temperature difference of the burner cooling water is about 2 degrees higher than usual; this condition persists for approximately 5 days, or 120 hours, before returning to normal. What is the mechanism behind this phenomenon? First of all, I don’t agree with explanations such as dust accumulation on the vault.
Don’t understand, mark it and wait for someone more knowledgeable to answer
This kind of situation can occur even with continuous feeding. Moreover, many companies using GE gasifiers face this issue as well. Slag protection is currently considered to be a common explanation for this phenomenon, but I disagree with that. That doesn’t make sense.
If you don’t agree, it means you’ve thought it through carefully, but not thoroughly enough. If it’s the first time the burner is being started and the burner is clean, then the explanation related to slag protection might be acceptable to you. But as you mentioned, the same phenomenon occurs even when feeding material continuously; therefore, you don’t accept the idea of slag protection. Generally speaking, after feeding material into the gasification furnace, operations stabilize within a little over an hour and return to normal. I suggest you analyze the operation mode of the burner cooling water system to see if there is any logic that satisfies you; no need to say more.
As for the vault temperature, there are also several detailed factors that influence it, which require our careful consideration. The gasification furnace has just started up and reached stable operation; as long as the operations are normal, the concept of slag protection indeed cannot explain this phenomenon. Because once the gasification furnace is operating stably, the backflow zone at the dome is also stable, and the thickness of the slag that can be scraped off remains constant; it does not get thicker over time. Ultimately, the wall temperature of the arch furnace is still determined by the heat transfer from inside to outside, from high to low temperatures. So the focus is elsewhere.
At the beginning of feeding, the temperatures at these arches rise significantly; this is actually caused by a too low burner load, which results in short burner flames and thus an upward shift of the high-temperature zone. In general, this situation can be effectively resolved by quickly increasing the load to normal levels or adjusting the oxygen ratio in the system. Changes in the temperature of the burner cooling water are also a consequence of this phenomenon, provided that other factors related to the burner cooling water, such as flow rate and temperature during circulation cooling, remain unchanged. :)
This is normal; a temperature 50°C higher than usual is acceptable. Firstly, the load is low, and moreover the furnace is unstable – the appropriate oxygen-coal ratio has not been found, and the levels in the gasification circuit are also unstable. Once things stabilize, then adjusting the oxygen level at the control center will suffice!
What was said on the 7th floor makes some sense. . . . . . . . . . .