I. Technical Principle
A mixture of methanol and desalted water after heating vaporization and overheating enters into a reforming reactor. Methanol and water vapor, under the action of catalyst, complete methanol decomposition, and carbon monoxide-carbon dioxide shift reaction in the reforming reactor.
Methanol decomposition: CH3OH→CO+2H2-90.7 KJ/mol
CO shift: CO+H2O→CO2+H2+41.2 KJ/mol
Overall reaction: CH3OH+H2O→CO2+3H2-49.5 KJ/mol
The overall reaction is endothermic. The reaction products are separated through heat transfer, cooling, condensation and washing. The conversion per pass of methanol reaches 95% or more. Unreacted raw materials (such as methanol, desalinated water) are recycled. The reforming gas after washing is separated (hydrogen purification) through pressure swing adsorption.
II. Technical Indicators
Hydrogen pressure: 0.2~3.0MPa
Hydrogen purity: 99~99.9999%
Operating temperature: 230~280℃
III. Characteristics and Advantages
High methanol conversion rate: The conversion per pass is larger than 95%, with less catalysts used (condensing capacity~3t/1000Nm3)
Low consumption of methanol: 0.54kg/Nm3 H2 (conventional process), 0.5kg/Nm3 H2 (low consumption process)
Long service life of catalysts: The guaranteed service life lasts for 3 years, and service life can reach 6 years during actual operations
Strong processing capacity of reforming reactor (Hydrogen generation at 10000 Nm3/h per unit), with less investment
Recycling of raw materials, without discharge of liquid