MTP regeneration unit

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This post was last edited by jordan569 on 2013-1-6 20:57. When the total conversion rate of the vDME/MeOH feed is below 95%, the catalyst in the MTP reactor must be regenerated. The regeneration process uses a mixed oxygen/nitrogen combustion to burn off the carbon deposits on the catalyst. To ensure the continuous operation of the unit, it operates in a mode with three MTP reactors, two in use and one on standby (or for regeneration). During regeneration, the reactor to be regenerated is first purged with steam and dried with nitrogen after stopping feed, followed by carbon burning using a mixture of hot nitrogen and hot air. During normal production, reactors A and B are in operation, while reactor C is in standby mode. v When the catalyst in Reactor A needs to be regenerated, Reactor A will go offline, and Reactor C will prepare to come online. Switching is achieved by controlling the feed method of the first bed layer in the reactor: Reactor A is controlled by flow rate, Reactor C by pressure, and Reactor B by flow rate, so that the production facility is not affected by the switching procedure. When reactor C is in standby mode, it is maintained at approximately 430°C using process superheated steam, which comes from the top of the process steam tower and is superheated to 480°C by a regenerator heater. The gas leaving reactor A enters the pre-quench tower after having its heat recovered by the waste heat recovery system. By changing the side feed temperature of beds 2 to 6 of the DME heater and the feed temperature from the heater to bed 1, the outlet temperature of reactor A was gradually cooled to 430°C. The feed to Reactor A was gradually switched to Reactor C, and during this switching process, the inlet temperature of both Reactors A and C was maintained at around 430°C. v Once the feed is evenly distributed between Reactor A and Reactor C, more water vapor from the regenerator heater is added to Reactor A. The feed of process materials is gradually switched completely from Reactor A to Reactor C, until only water vapor remains as the feed to Reactor A; thereafter, the temperature of Reactor C is increased step by step to the normal operating value. The nitrogen for regeneration comes from the plant’s nitrogen pipeline network. The air for regeneration is supplied by an air compressor. Once the steam purging of Reactor A is completed, the regenerator gas heater stops receiving steam. To dry reactor A, pure nitrogen is heated to 430°C in the regenerator gas preheater and the regenerator gas heater before being fed into reactor A until all the steam has been blown away. The steam/nitrogen mixture is discharged to the atmosphere after recovering heat. . Note # ) # # , . hcbbs