METHANE SYNTHESIS SYSTEM

• Main Authors: NAKAJIMA SEIJI, SHINOKI TOSHIO, ONAKA YOJI, YAJIMA MAKOTO, KAWAMOTO MAKOTO
• Format: Patent
• Language: English; Japanese
• Published: 25.01.2024
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS; METALLURGY; ORGANIC CHEMISTRY

To provide a methane synthesis system capable of enhancing methane generation efficiency.SOLUTION: A methane synthesis system comprises: a co-electrolytic part; a methanation reaction part using hydrogen and carbon monoxide acquired from the co-electrolytic part for acquiring a product gas including methane; a separator for separating water from the product gas; a water supply path for supplying water from an external part; a cooling part which has a circulation path in which, a refrigerant whose phase can be varied, is circulated, the cooling part cooling the methanation reaction part; and a collection path for guiding water separated at the separator with water supplied from the water supply path to the cooling part, as the refrigerant. The collection path introduces the refrigerant into the circulation path which is at inside of the cooling part. The cooling part cools the methanation reaction part by evaporation heat following evaporation in the circulation path of at least a part of the refrigerant introduced from the external part by the collection path, and lowers a temperature on an outlet of the methanation reaction part relative to a temperature on an inlet. The refrigerant passed through the cooling part is introduced to the co-electrolytic part as water used for electrolysis.SELECTED DRAWING: Figure 1 【課題】メタンの生成効率を高めることができるメタン合成システムを提供する。【解決手段】本開示に係るメタン合成システムは、共電解部と、共電解部から得た水素と一酸化炭素とを用いてメタンを含む生成物ガスを得るメタン化反応部と、生成物ガスから水を分離する分離器と、外部から水を供給する水供給経路と、相変化可能な冷媒が流通する流通路を有し、メタン化反応部を冷却する冷却部と、分離器で分離した水を水供給経路から供給された水とともに冷媒として冷却部に導く回収経路と、を備える。回収経路は、冷媒を冷却部の内部にある流通路に導入する。冷却部は、回収経路によって外部から導入された冷媒の少なくとも一部が流通路内で気化するのに伴う気化熱によってメタン化反応部を冷却し、メタン化反応部の出口における温度を、入口における温度より低くする。冷却部を経た冷媒は、電気分解に用いる水として共電解部に導かれる。【選択図】図１