Control of coking temperature in delayed coking heaters
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Dear fellow students: There are various opinions online regarding the problem of coking in the delayed coking heaters. The temperature in our heaters can reach up to 700 degrees (in the furnace chamber), and the material used is Cr5Mo. I’m not sure whether this is reasonable; please share your views. Thank you! This post was last edited by along2006 on 2009-3-1 11:38.]
The furnace temperature should be as low as possible, provided that it still allows for the combustion of coke inside the tubes; the normal temperature for coke burning is 600°C, with a maximum of ≤650°C. Cr9Mo can appropriately increase the temperature. This post was last edited by along2006 on 2009-3-1 11:39.]
Generally speaking, the burning temperature is primarily determined by the material of the tube furnace and the design parameters of the heating furnace.
The burning temperature must not exceed 650 degrees, as this will reduce the lifespan of the furnace tubes. When burning, it is necessary to do so slowly and without haste; follow the procedures – rushing things along will only lead to worse results!
When burning occurs, the key is to check whether the surface temperature of the furnace tube exceeds the allowable limit. According to the specifications provided by the designer, the material used is Cr5Mo, and the oxidation resistance limit temperature of the furnace tube is 650°C; it is recommended that the temperature inside the furnace not exceed 750°C℃； The material is Cr9Mo; the oxidation resistance limit temperature of the furnace tube is 705, and it is recommended that the furnace temperature not exceed 800℃ ；
Cr5Mo cannot be heated that high; its maximum operating temperature is 600 degrees. Cr9Mo can withstand 650 degrees. The case of scorching is different; the delayed coking projects and processes specify that temperatures can exceed 650 degrees in a short period of time. It’s just not clear what exactly is meant by this short period of time During the burning process, when it reaches the area where the thermocouple is located, the temperature can reach 800–1000 degrees, or even exceed 1000 degrees.
I agree with the view that \"snow should be cleared from the north door.\" Under normal circumstances, the temperature of the furnace tubes when they burn is quite high, far exceeding 600 or 650 degrees; the tubes turn a dark red color as a result of this high temperature.
Thank you; it seems that the temperature at which we caused burning is still acceptable
The key is to ensure that the wall temperature of the furnace tube does not exceed the limit temperature.
Just burn it according to the procedures; since there is a medium inside the furnace tube, it will not cause any damage to the tube. But be careful to avoid burning out.
The burning temperature mainly depends on the material of the furnace tubes, and is determined with reference to the design parameters of the heating furnace. If the temperature is too high, exceeding the tolerance limit of the material, it will reduce the lifespan of the furnace tubes; in severe cases, the tubes may even burn through, which is extremely dangerous!
The charring temperature is determined by the design parameters of the heating furnace, and it should be **below the upper temperature limit of the material. However, this does not allow one to arbitrarily increase the burning temperature.