Low-flow heating mode for continuous reforming
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How does the low-flow heating mode during the continuous reforming accident at Guangxi Petrochemical protect the plate-type reforming feed heat exchanger?
The speed of the reforming cycle machine is maintained at normal levels to ensure proper gas circulation within the reforming reaction system. When the processing capacity is less than 50% of the design capacity, the reaction temperature can be reduced to 485 degrees; if the processing capacity is even lower, the reaction temperature can be lowered to 375 degrees. This post was last edited by Zhongyuanren on 2009-2-5 22:28]
The low-flow combustion mode is a new type of fuel gas line; it is designed to prevent a sharp drop in temperature caused by the shutdown of the compressor and the consequent closure of the main gas line to the furnace, which could lead to a sudden drop in the pressure across the heat exchanger and thus equipment damage. This mechanism helps keep the furnace temperature at a controllable level
Under what circumstances is this low-flow combustion gas line activated? Could you explain it in more detail?
No one has used it, so how can they explain it clearly? It’s all just what others say. Please have those who have used it and used it well explain it; theoretical things or things read in books – everyone knows those, so there’s no need to write about them.
Mainly when the circulating hydrogen compressor is restarted, the cold and hot streams enter sequentially, which can easily result in excessive temperature differences in the Packinox, leading to cracks in the plate exchanger
When the cyclical compressor is shut down for an extended period, the temperatures of the heat exchangers and furnace tubes drop, but the temperature of the reactor does not decrease. With a recompression compressor, startup occurs at a lower flow rate. There is a low-flow hydrogen line from the recontact point to the heat exchanger inlet, which is used to establish hydrogen circulation in the reaction system. Then, when the furnace is turned on, the gas pressure in the furnace is controlled by a fixed self-acting control valve, thereby maintaining combustion. Then, the heat inside the reactor is gradually removed; the circulation hydrogen compressor is started only after the temperatures of the reactor and the furnace tubes have approached each other, thereby protecting the reactor and the heat exchanger.
The meaning on the 6th floor is more or less the same – it’s about replacing protective panels, equipment, reactors, and so on
Senior: I have a question for you – is it true that the reaction temperature is reduced to 485 degrees when half of the feedstock for the reformation process has been added?