| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain hydrogen of high purity by performing feedforward control of the flow rate of hydrocarbon for hydrodesulfurization and the flow rate of hydrocarbon for reforming in two stages to control the pressure of gaseous hydrogen to a prescribed value. SOLUTION: Sulfur in hydrocarbon feedstock is converted into H2 S by a hydrogenation reactor 2, and the H2 S is removed by a sulfur adsorption reactor 3 to turn the hydrocarbon into desulfurized hydrocarbon, and it is turned into reformed gas by steam in a reforming reactor 4 to form hydrogen by a CO shift reactor 5, and components other than gaseous hydrogen are absorbed and desorbed by a pressure swing adsorption/desorption device 6 and removed and discharged, to obtain gaseous hydrogen of high purity. A control signal for combining pressure displacement calculated by a hydrogen pressure controller PC1 with a time lag factor from a control system arithmetic unit 7 to which the flow rate value is inputted is sent to a flow controller FC1 to automatically change an operation load according to the quantity of gaseous hydrogen, allowing the flow rate of hydrocarbon for reforming to be controlled. Similarly, the flow rate of hydrocarbon for hydrodesulfurization is automatically controlled, and feedforward control is performed together to keep the pressure of gaseous hydrogen product constant.</p> |
