The issue of temperature switching during the shutdown of coking units
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This post was last edited by sxf1028102800 on 2025-5-26 at 22:38. When the coking unit is shut down, the heating furnace is cooled at a rate of 60°C per hour. Once the temperature at the outlet of the heating furnace drops to 460°C, the four-way valve is switched, and the feed at the bottom of the old tower is directed to the feed line at the top of the new tower, so that the feed goes directly into the new tower. I have a gentle question: why switch to the new tower at this temperature? Why enter from the top of the new tower? Can’t we enter it from the four-way valve at the bottom? Will coke be formed at this temperature? I don’t quite understand. If you know, please explain it. Thank you; I’m looking forward to your reply. Plus points!
When the coking unit is shut down, switching the four-way valve at 460°C is chosen because this temperature ensures the safety of the equipment and its operational stability. At this point, the viscosity of tar and other substances is moderate, which facilitates flow and distribution and helps to prevent blockages or other issues during the switching process. Feeding from the top of the new tower rather than through the bottom manifold valve is primarily intended to ensure the uniformity and effectiveness of the reaction. When feeding from the top, gravity and gas flow can be utilized to facilitate the reception of material by the new tower, thereby improving reaction efficiency. Entering from the bottom may cause confusion in the layers or lead to disruptions, affecting the outcome of subsequent processing. Overall, this design takes into account the safety of operation, fluidity, and processing efficiency. I hope these explanations can help you! .
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