Hydrogen from natural gas

I. Technical Principle 

Raw material natural gas is compressed (gas pressure for raw material is lower than 1.6Mpa), mixed with water vapor after refining desulfurization, and converted and reacted by overheating under the action of catalyst, to produce a fluidizing gas whose hydrogen content is larger than 70% (v/v%). The reforming gas is separated and purified through PSA unit to obtain the product of hydrogen.

Under the action of 800℃high temperature, a certain pressure and catalysts, alkane and water vapor contained in natural gas set off a chemical reaction to produce a reforming gas containing H2, CO, CO2, N2 and CH4. The reforming gas enters into the shift converter through the waste heat transfer, and CO is converted into H2 and CO2. CO2 is recycled through heat transfer, condensation, steam-water separation, automatic program control, and the gas passes adsorbent loaded with a plurality of specific adsorbents in turn, and the product of hydrogen is extracted after PSA adsorbing N2, CO, CH4 and CO2 through raising pressure. Impurities are released through depressurization and adsorbents are reactivated.

II. Technical Indicators 

Hydrogen pressure: 1.6~3.0Mpa

Hydrogen purity: 99~99.999%

Scale: 200~100000Nm3/h

Natural gas consumption: 0.38~0.42Nm3/Nm3 H2 

III. Technical Characteristics 

1. Natural gas is not only feed gas but also fuel gas, and requires no transport, with low demands for public works, low energy consumption of hydrogen, low consumption, and the lowest cost of hydrogen. This preparation method is suitable for large-scale hydrogen production.

2. High degree of automation, high safety performance.

3. Compared with coal gas: Small footprint, no pollution, no residue, with good environmental performance.