System and process for preparing hydrogen by solar energy middle-low temperature thermal driven thermal chemical reaction

Abstract

The invention discloses a hydrogen production system by utilizing thermochemical reaction thermally driven by solar energy under medium-lower temperature, which comprises a material supplying device for storing materials required for producing hydrogen, a material mixing device for mixing raw materials and non-reactants, a material measuring device for controlling the volume of raw materials sent into a preheater per unit time, the preheater for preheating raw materials, a solar energy absorption reactor for driving raw material to carry out reforming reaction by utilizing absorbed solar energy heat, a solar energy collector for aggregating solar energy with low energy flow density into medium-lower temperature heat energy with high energy flow density in a form of line focus so as to provide heat for material reforming reaction, a condenser for cooling reaction products, a gas-liquid separator for separating gas and liquid of a mixture, and a PSA (pressure swing adsorption)device for separating the obtained pure hydrogen. The invention also discloses a method for producing hydrogen by utilizing thermochemical reaction thermally driven by solar energy under medium-lower temperature. The system and the method of the invention reduce the cost of producing hydrogen by utilizing solar energy and are beneficial to mass popularization and application.

Description

technical field [0001] The present invention relates to the technical field of solar energy utilization, in particular to a system and method for producing hydrogen by thermochemical reaction driven by low-temperature heat in solar energy, in particular to a system and method for producing hydrogen by means of a low-concentration-ratio solar concentrating device to provide alternative fuel reforming reactions A conversion system and method for low-to-medium grade energy required. Background technique [0002] In the 21st century, the world's energy will shift from being dominated by fossil energy to an ever-changing diversified energy structure such as fossil fuel, nuclear energy, solar energy, and renewable energy. In particular, the advantages of solar energy, such as wide distribution, unlimited reserves, and clean exploitation and utilization, have attracted widespread attention. However, for a long period of time, the cost of large-scale development and utilization of s...

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Problems solved by technology

[0008] (3) Hydrogen production by solar methane reforming. The heat required for methane steam reforming at around 900°C is provided by tower solar concentrating devices. However, due to high temperature, the efficiency of the receiver is low, and the entire system is complex and costly.

[0010] Regarding the above four hydrogen production methods, all of them use high-temperature solar energy to produce hydrogen. The common feature is that they all use expensive solar concentrators to gather high-grade solar energy higher than 900°C to provide the heat energy required for hydrogen production, resulting in The technical problem of high hydrogen cost and higher requirements for the use of materials are not conducive to large-scale application

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