Process for preparing hydrogen by strengthening chemical chain reforming in continuous catalytic adsorption manner via moving bed

Abstract

The invention discloses a process method for preparing hydrogen by strengthening chemical chain reforming in a continuous catalytic adsorption manner via a moving bed. The process method is characterized by adopting a reformer, a regenerator, a condenser, a cyclone separator and a lifting pipe, wherein glycerinum which is a biodiesel byproduct serves as a raw material for preparing the hydrogen. According to the method, the oxygen transfer performance of the oxidation reduction of an NiO / AI2O3 catalyst is utilized fully, so that in-situ adsorption intensification of CO2 for hydrogen preparation is carried out by taking CaO as an adsorbent; the water vapor serves as a carrier gas of the reformer, so that the water vapor and the hydrogen of a product are separated conveniently; and the catalyst reduced in the reformer and an adsorbent mixture adsorbing the CO2 are simultaneously oxidated and regenerated in the regenerator. According to the process method, the partial oxidation, the water vapor reforming, the water-vapor transformation and the CO2 adsorption are carried out in the regenerator in a highly coupling manner; and the continuous movement, reaction and regeneration of the catalyst and the adsorbent are carried out by using the moving bed, so that an approximately fresh state is maintained always. Therefore, the hydrogen with high purity is continuously and stably produced at the low temperature under the normal pressure. As a result, the hydrogen preparing process is simplified; the hydrogen preparing cost is saved greatly; and the CO2 is continuously desorbed by the regenerator, which is favorable for CO2 reclamation.

Description

technical field [0001] The invention relates to a process method for continuous catalytic adsorption and enhanced chemical chain reforming hydrogen production in a moving bed, and more specifically, a method for continuously catalytic partial oxidation coupled with CO by using glycerol, a by-product of biodiesel, as a raw material for hydrogen production. 2 In-situ adsorption enhanced steam reforming, a process for producing high-purity hydrogen efficiently and cheaply.  Background technique [0002] The main process of steam reforming hydrogen production includes: raw material pretreatment, steam conversion, CO water vapor shift, pressure swing adsorption (PAS) and waste heat recovery, etc. Due to the limitation of strong heat absorption and reaction balance, steam reforming generally requires high temperature, and the purity of hydrogen is not high. High temperature means high energy consumption, and increases the cost of manufacturing and maintenance of key equipment....

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Problems solved by technology

British P. Pimenidou and V. Dupont et al published in Bioresource Technology in 2010 (P. Pimenidou, et al., Bioresource Technology, 2010, Volume 101, pages 9279-9286) research on waste cooking oil Hydrogen production by chemical chain reforming and CO adsorption in situ 2 , the oxygen transfer performance of the reduction and oxidation of NiO was measured experimentally, but the process uses a fixed-bed reactor for intermittent operation, and does not involve any regeneration problems, so it cannot be used in engineering applications; my country's Dai Xiaoping published in "Catalysis "Journal", (Dai Xiaoping, Acta Catalysis, 2011, vol. 32, pp. 1411-1417) research on nanocomposite perovskite oxygen carrier chemical cycle reforming methane to synthesis gas and Zheng Ying et al published in 2011 "Chinese Journal of Electrical Engineering "(Zheng Ying et al., Proceedings of the Chinese Society for Electrical Engineering, 2011, Vol. 31, pp. 90-96) Regarding the preparation and oxygen release performance of perovskite-type composite oxygen carriers, all of them are oxygen carrier materials, and there is no content on adsorption enhancement and reformation. , and there is no research on the regeneration method and application process; Dou Binlin et al. In the patent: a moving bed continuous catalytic adsorption enhanced reforming bio-glycerol hydrogen production process (patent number: ZL 201010248222.7), the concept of moving bed was introduced to carry out The continuous reaction and regeneration method is an innovation, but the hydrogen production reaction in the reformer is a reduced catalyst Ni / AI 2 o 3 , requires a large amount of external heat supply, which does not solve the problem of high energy consumption in the process. At the same time, the carrier gas in the reformer is nitrogen, and the final product needs to separate hydrogen and nitrogen, which increases the cost of hydrogen production

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