Hydrogen is widely used in steel, metallurgy, chemical industry, medical, light industry, building materials, electronics and other fields. Methanol reforming technology to produce hydrogen has the advantages of low investment, no pollution, and easy operation. It has been widely used in all kinds of pure hydrogen plant.
Mix methanol and water in a certain proportion, pressurize, heat, vaporize and overheat the mixture material to reaches a certain temperature and pressure, then in the presence of catalyst, methanol cracking reaction and CO shifting reaction perform at the same time, and generate a gas mixture with H2, CO2 and a small amount of residual CO.
The whole process is an endothermic process. The heat required for the reaction is supplied through the circulation of the heat conduction oil.
To save heat energy, the mixture gas generated in the reactor makes heat exchange with the material mixture liquid, then condenses, and is washed in the purification tower. The mixture liquid from the condensation and washing process is separated in the purification tower. The composition of this mixture liquid is mainly water and methanol. It is sent back to the raw material tank for recycling. The qualified cracking gas then is sent to the PSA unit.
Technical Characteristics
1. High intensification (standard modularization), delicate appearance, high adaptability on construction site: the main device below 2000Nm3/h can be skidded and supplied as a whole.
2. Diversification of heating methods: catalytic oxidation heating; Self-heating flue gas circulation heating; Fuel heat conduction oil furnace heating; Electric heating heat conduction oil heating.
3. Low material and energy consumption, low production cost: the minimum methanol consumption of 1Nm3 hydrogen is guaranteed to be < 0.5kg. Actual operation is 0.495kg.
4. Hierarchical recovery of heat energy: maximize heat energy utilization and reduce heat supply by 2%;
5. Mature technology, safe and reliable
6. Accessible raw material source, convenient transportation and storage
7. Simple procedure, high automation, easy to operate
8. Environmentally friendly, Pollution free
Mix methanol and water in a certain proportion, pressurize, heat, vaporize and overheat the mixture material to reaches a certain temperature and pressure, then in the presence of catalyst, methanol cracking reaction and CO shifting reaction perform at the same time, and generate a gas mixture with H2, CO2 and a small amount of residual CO.
Methanol cracking is a complicated multicomponent reaction with several gas and solid chemical reactions
Major reactions:
|
CH3OH |
|
CO + H2O |
Summary reaction:
CH3OH + H2O  CO2 + 3H2 – 49.5kJ/mol |
The whole process is an endothermic process. The heat required for the reaction is supplied through the circulation of the heat conduction oil.
To save heat energy, the mixture gas generated in the reactormakes heat exchangewith the material mixture liquid, then condenses, and is washed in the purification tower. The mixture liquid from the condensation and washing process is separated in the purification tower. The composition of this mixture liquid is mainly water and methanol. It is sent back to the raw material tank for recycling. The qualified cracking gas then is sent to the PSA unit.
Pressure Swing Adsorption (PSA) is based on the physical adsorption of gas molecules on the inner surface of a specific adsorbent (porous solid material). The adsorbent is easy to adsorb high-boiling components and difficult to adsorb low-boiling components at the same pressure. The adsorption amount increase sunder high pressure and decreases under low pressure. When the feed gas passes through the adsorption bed under a certain pressure, the high-boiling impurities are selectively adsorbed and the low-boiling hydrogen which is not easily adsorbed gets out. The separation of hydrogen and impurity components is realized.
After the adsorption process, the adsorbent desorbs the absorbed impurity when reducing the pressure so that it can be regenerated to adsorb and separate impurities again.
1. H2 Recycling from H2-rich gas mixture (PSA-H2)
Purity: 98%~99.999%
2. CO2 Separation and purification (PSA – CO2)
Purity: 98~99.99%.
3. CO Separation and Purification (PSA – CO)
Purity: 80%~99.9%
4. CO2 Removal (PSA – CO2 Removal)
Purity: <0.2%
5. PSA – C₂+ Removal
* The VPSA oxygen production process implements “customized” design according to the user’s different altitude, meteorological conditions, device size, oxygen purity (70%~93%).
