Propane dehydrogenation device and propane dehydrogenation method

Abstract

The invention relates to a propane dehydrogenation device and a propane dehydrogenation method. The propane dehydrogenation device comprises a dehydrogenation reactor (1) and a heat exchanger (2), wherein a tube pass inlet (24) of the heat exchanger (2) is connected with a reaction raw material conveying pipeline (a); a tube pass outlet (25) of the heat exchanger (2) is connected with an inlet ofthe dehydrogenation reactor (1) through a heating furnace (3); an outlet of the dehydrogenation reactor (1) is connected with a reaction product conveying pipeline (b); the reaction product conveyingpipeline (b) is divided into two paths; a first path of reaction product conveying pipeline (b1) is connected with a shell pass inlet (22) of the heat exchanger (2) through a valve (5); a second pathof reaction product conveying pipeline (b2) is connected with the shell pass inlet (22) of the heat exchanger (2) through a steam generator (4); a shell pass outlet (23) of the heat exchanger (2) is connected with downstream equipment. The propane dehydrogenation device is low in investment and high in heat exchange efficiency, a bias problem occurred among multiple heat exchangers is effectivelyavoided, the stability of the propane dehydrogenation device, the yield of propylene and the steam output are improved, and an operation cycle is prolonged.

Description

technical field [0001] The invention relates to the field of chemical equipment, in particular to a propane dehydrogenation device and a propane dehydrogenation method. Background technique [0002] The propane dehydrogenation unit is equipped with multiple reactors, and each reactor is switched at a certain time interval according to operation→steam purge→regeneration→reduction→operation. During the switching process of the reactor, the working condition of the heat exchanger also fluctuates, that is, the whole operation process is an intermittent pulse-shaped fluctuation state. [0003] At present, the heat exchangers for the reaction feed and reaction discharge of the propane dehydrogenation unit are mainly operated in parallel with multiple tube-and-tube heat exchangers, which are prone to bias flow between heat exchangers arranged in parallel, resulting in heat exchange The temperature difference is large, the operating pressure drop is high, and the energy consumption...

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Problems solved by technology

[0003] At present, the heat exchangers for the reaction feed and reaction discharge of the propane dehydrogenation unit are mainly operated in parallel with multiple tube-and-tube heat exchangers, which are prone to bias flow between heat exchangers arranged in parallel, resulting in heat exchange The temperature difference is large, the operating pressure drop is high, and the energy consumption of the device is high. In addition, these heat exchangers are prone to internal leakage, which directly reduces the product yield and increases the energy consumption of the compressor and the heating furnace.

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