High-temperature steam electrolytic hydrogen production system using medium-low-temperature heat source

Abstract

The invention discloses a high-temperature steam electrolytic hydrogen production system using a medium-low-temperature heat source. The high-temperature steam electrolytic hydrogen production system comprises a steam generator, a solid oxide electrolyzer, a regenerative superheater, a regenerative heater, a deaerator, a water feed pump, an auxiliary electric heater, a steam pipeline, a hydrogen delivery pipeline, an oxygen delivery pipeline and a raw material water pipeline. According to the high-temperature steam electrolytic hydrogen production system, the steam generator adopting the medium-low-temperature heat source is used for generating low-temperature saturated steam; the steam is heated through waste heat generated during reactions of the solid oxide electrolyzer to become high-temperature superheated steam, and then the high-temperature superheated steam is sent into the electrolyzer for hydrogen production. The regenerative superheater, the regenerative heater and the deaerator are used for heating the system by recovering high-temperature waste heat of gaseous products of the electrolyzer in a stepped mode. By adopting the high-temperature steam electrolytic hydrogen production system, the temperature condition restraint and heat supply cost of the heat source for solid oxide electrolytic hydrogen production are reduced, the total efficiency of hydrogen production is improved effectively, and the system can be widely used for recycling medium-low-temperature waste heat and coupling multiple kinds of renewable energy sources. The system has the characteristics of low cost, high efficiency and high applicability.

Description

Technical field [0001] The invention belongs to the technical field of hydrogen production by water electrolysis, and particularly relates to a high-temperature steam electrolysis hydrogen production system using medium and low temperature heat sources. Background technique [0002] Hydrogen energy is rich in resources, high calorific value, clean and pollution-free. It is the most promising fuel and energy carrier in the 21st century. At the same time, hydrogen is also widely used in industrial production. The current mature hydrogen production technologies are mainly fossil fuel hydrogen production and water electrolysis hydrogen production. Fossil fuel hydrogen production consumes primary energy, has complex processes, and has serious pollution. It has not solved energy and environmental problems, while water electrolysis hydrogen production is completely clean. The hydrogen production method has the characteristics of high product purity and easy operation. At the same time, ...

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Problems solved by technology

Since the solid oxide electrolyzer requires high-temperature water vapor from the outside, the higher the temperature of the water vapor, the higher the efficiency of the electrolyzer, and the high-temperature water vapor must be matched with a high-temperature heat source, such as a high-temperature gas-cooled reactor and a high-temperature furnace, etc., so The practical application of the solid oxide electrolyzer is greatly restricted; at the same time, the recovery and utilization of the waste heat of the electrolyzer still needs to find a suitable external heating system to couple with it, which increases the complexity of the process and does not Certainty

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