Device and method for autothermal production of high-purity hydrogen by catalytic cracking of methane

Abstract

The invention discloses a device and method for autothermally producing high-purity hydrogen by catalytic cracking of methane. The device mainly includes a cracking reactor, a regeneration reactor, a riser, a cyclone separator, a filter device and a flow sealing valve; the method includes: Methane goes backwards with the catalyst in the cracking reactor and undergoes a catalytic cracking reaction to obtain hydrogen and deactivated catalyst. After impurity removal and separation, high-purity hydrogen is obtained. The catalyst carries carbon deposits into the regeneration reactor for regeneration to generate syngas and regenerated catalyst. The regenerated catalyst is transported to the cyclone separator through the riser, and then re-enters the cracking reactor for recycling after removing impurities. The present invention can not only fully recover the catalytic activity of the deactivated catalyst, produce high-purity hydrogen, but also use the heat released by the combustion of carbon deposits on the deactivated catalyst to provide heat for the regeneration reactor, and use the heat carried by the regenerated catalyst to provide heat for the cracking reactor. Heat, so that the system runs by self-heating, reducing energy consumption and saving costs.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production, and in particular relates to a device and method for autothermally producing high-purity hydrogen by catalytic cracking of methane. Background technique [0002] There are two main ways to produce hydrogen from methane: one is through the preparation of synthesis gas (H 2 and CO), and then physically or chemically remove CO to obtain H 2 , including steam methane reforming (SRM), partial oxidation (POM), autothermal reforming (ATR), carbon dioxide reforming, and combined reforming processes; the other is direct catalytic cracking of methane to obtain hydrogen and carbon black. [0003] SRM is currently the most widely used hydrogen production method in industry, but this method needs to go through three stages of synthesis gas preparation, water gas shift and decarbonization to obtain high-purity hydrogen. The process is relatively complicated and produces a large amount of carbon di...

AI Technical Summary

Problems solved by technology

[0004] There are two main problems in the existing methane catalytic cracking hydrogen production process. One is that the catalyst is easily deactivated during the reaction process, resulting in low methane cracking conversion rate and low hydrogen concentration. The other is that the system generally requires an external heat source and cannot Self-heating operation, resulting in complex system and high operating cost

Therefore, methods for the catalytic cracking of methane to produce hydrogen remain to be further developed

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