Coal feeding issue in Shell gasifier
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Generally, when feeding coal into a gasification furnace, it is necessary to raise the furnace temperature to a certain level, such as above 800 degrees. This is especially true for gasification furnaces that use refractory materials, as there are limits on the rate at which the temperature of these materials can increase. If coal is fed in at low temperatures, on one hand, the temperature cannot be effectively controlled, and on the other hand, large amounts of tar are produced. Since Shell uses water-cooled walls, the limitation on the heating rate is likely to be low. However, will the downstream fly ash filter be affected by the tar generated during coal feeding? This leads to problems such as clogging of the fly ash filter. I’d like to ask the Shell enthusiasts, thank you!
The coal feeding temperature doesn’t need to be as high as 800 degrees; 200-300 degrees is sufficient at the start of operation. When SUB can no longer handle the load, coal is added in advance; improper addition of coal may cause the S1501 filter element to break.
This post was last edited by huchsh on 2010-5-17 at 21:46. 300 degrees, coal feeding – it must be coke being fed, right? Otherwise, although the water wall can withstand a sudden rise in temperature to over 700 degrees, tar will still be produced. How to explain this? It’s really hard to understand things without using a shell; I hope this can serve as a reference for similar processes.
I guess the coal should be added at around 800 degrees. Does anyone have the operating instructions for a Shell furnace? Please send them so I can study them
The deciding factor for feeding coal is to raise the pressure in the gasifier to 1. Around 5 MPA; the goal is to maintain stability in the coal feed line during coal feeding, and the temperature requirements are not that strict. For reference, S-1501 can be started first – it will just consume some nitrogen
This post was last edited by jors1983 on 2010-5-17 22:59. Do you need to increase the pressure to 15 kilograms there? Here, it’s usually around 6 to 8 kilograms; in abnormal cases, as little as 4 kilograms of coal is used. The back pressure in the coal powder line is around ten kilograms
Can’t even withstand 800 degrees? I don’t think so; let others come and answer.
Your explanation is hard to understand; aren’t temperature requirements that strict? What does it mean? Maybe what you started by feeding in wasn’t coal, but coke. By feeding in coal at low temperatures, your entire downstream system doesn’t heat up. Tar begins to decompose only at temperatures above 800 degrees; a large amount of tar ends up in the downstream section – doesn’t that cause any problems? You said to start the S-1501 ceramic filter first; it’s meant to be turned on first to heat up for a while. So your argument is quite far-fetched. Brother.
It’s possible to relax while driving; how is it that it’s so easy to get carried downstream? As long as the device reaches the preset temperature, higher temperatures are not a problem
Ah, welcome other sea friends to come and offer more guidance.
When the system pressure rises to about 8–10 kilograms and the coal feed line is stable, coal feeding can be considered. At this time, the temperature inside the furnace is approximately 800 to 900 degrees. At this time, the coal powder does not burn completely, and unburned coal powder will enter the S1501 downstream; therefore, S1501 must be put into operation before coal is fed in. Within a short period of time, all the burners are put into use, and the temperature rises rapidly to 1300–1500 degrees.