A hydrogen generation device of the present invention comprises a first path (31) used to supply a raw material to a reformer (1) through at least a first desulfurization unit (2); a second path (32) used to supply the raw material to the reformer (1) through only the second desulfurization unit (3)
A hydrogen generation device of the present invention comprises a first path (31) used to supply a raw material to a reformer (1) through at least a first desulfurization unit (2); a second path (32) used to supply the raw material to the reformer (1) through only the second desulfurization unit (3); a switch unit (6); a flow control unit (8) which selectively enables or inhibits a flow of the hydrogen-containing gas generated in the reformer 1 toward the second desulfurization unit (3); and a controller (12) configured to execute processing in such a manner that in at least either a time point before generation of the hydrogen-containing gas is stopped, or start-up, the switch unit 6 performs switching to select the first path (31), and the flow control unit (8) enables the flow of the hydrogen-containing gas, while the reformer 1 is generating the hydrogen-containing gas.
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1. A hydrogen generation device comprising: a reformer for generating a hydrogen-containing gas using a raw material;a first desulfurizer for adsorbing and desulfurizing a sulfur compound from the raw material supplied to the reformer;a second desulfurizer for hydrodesulfurizing the sulfur compound
1. A hydrogen generation device comprising: a reformer for generating a hydrogen-containing gas using a raw material;a first desulfurizer for adsorbing and desulfurizing a sulfur compound from the raw material supplied to the reformer;a second desulfurizer for hydrodesulfurizing the sulfur compound from the raw material supplied to the reformer;a first path used to supply the raw material to the reformer through at least the first desulfurizer;a second path used to supply the raw material to the reformer through only the second desulfurizer of the first desulfurizer and the second desulfurizer;a switch for performing switching between the first path and the second path;a third path used to supply the hydrogen-containing gas generated in the reformer to the second desulfurizer;a flow controller which selectively allows or inhibits a flow of the hydrogen-containing gas from an upstream end of the third path toward a downstream end of the third path; anda controller configured to, at least either before generation of the hydrogen-containing gas is stopped or when the hydrogen generation device is started, execute the following controls (i) and (ii) concurrently, while the reformer is generating the hydrogen-containing gas,(i) causing the switch to select the first path, and(ii) controlling the flow controller to allow the flow of the hydrogen-containing gas from the reformer to the second desulfurizer,wherein the controller executes the controls (i) and (ii) concurrently in a state in which a temperature of a hydrodesulfurization catalyst is a temperature at which hydrodesulfurization is enabled to proceed. 2. The hydrogen generation device according to claim 1, wherein the controller controls the flow controller to initiate the flow of the hydrogen-containing gas when a temperature of a hydrodesulfurization catalyst provided in the second desulfurizer is lower than a use temperature of the hydrodesulfurization catalyst. 3. The hydrogen generation device according to claim 1, wherein the controller controls the flow controller to initiate the flow of the hydrogen-containing gas when a temperature of the third path reaches a value which is equal to or higher than a temperature at which water condensation in the third path does not occur. 4. The hydrogen generation device according to claim 1, wherein the controller further causes the switch to perform switching to select the second path when a temperature of a hydrodesulfurization catalyst provided in the second desulfurizer is a use temperature of the hydrodesulfurization catalyst. 5. The hydrogen generation device according to claim 1, wherein the controller causes the switch to perform switching to select the first path and controls the flow controller to allow the flow of the hydrogen-containing gas for a predetermined time or longer. 6. The hydrogen generation device according to claim 5, wherein the predetermined time is set according to an accumulated supply amount of the raw material supplied to the second desulfurizer. 7. The hydrogen generation device according to claim 1, wherein the second desulfurizer includes a CoMo-based catalyst. 8. The hydrogen generation device according to claim 1, wherein the second desulfurizer includes a hydrodesulfurization catalyst which desorbs an unhydrogenated sulfur compound when the raw material is supplied to the second desulfurizer under a temperature lower than a use temperature; and wherein the controller controls the flow controller to initiate the flow of the hydrogen-containing gas, under a temperature which is equal to or lower than an upper limit temperature at which the unhydrogenated sulfur compound is not desorbed from the hydrodesulfurization catalyst. 9. The hydrogen generation device according to claim 8, wherein the hydrodesulfurization catalyst includes a CoMo-based catalyst, and the upper limit temperature is 150 degrees C. 10. The hydrogen generation device according to claim 1, wherein the second desulfurizer includes a CuZn-based catalyst. 11. A fuel cell system comprising: the hydrogen generation device as recited in claim 1; anda fuel cell for generating electric power using the hydrogen-containing gas supplied from the hydrogen generation device. 12. A method of operating a hydrogen generation device, the method comprising: (i) supplying a raw material, which has passed through a first desulfurizer for removing a sulfur compound from the raw material, to the reformer; and(ii) supplying a hydrogen-containing gas generated in the reformer to a second desulfurizer for hydrodesulfurizing the sulfur compound in the raw material,wherein the steps (i) and (ii) are concurrently executed at least either before generation of the hydrogen-containing gas is stopped or when the hydrogen generation device is started, andwherein the steps (i) and (ii) are concurrently executed in a state in which a temperature of a hydrodesulfurization catalyst is a temperature at which hydrodesulfurization is enabled to proceed. 13. The hydrogen generation device according to claim 1, wherein the controller includes processing circuitry and a memory storing a program, andthe program makes the processing circuitry execute controls (i) and (ii). 14. A hydrogen generation device comprising: a reformer that generates a hydrogen-containing gas from a raw material;a first passage through which the raw material is supplied toward the reformer;a second passage through which the raw material is supplied toward the reformer;a switch disposed upstream of the first passage and the second passage to select the first passage or the second passage as a path through which the raw material flows;a first desulfurizer disposed on the first passage to absorb and desulfurize a sulfur compound from the raw material;a second desulfurizer that hydrodesulfurizes the sulfur compound from the raw material, the second desulfurizer disposed on a common passage or the second passage, the common passage extending from a joint, at which the first passage and the second passage are joined with each other, to the reformer;a third passage through which the hydrogen-containing gas is supplied from downstream of the reformer to upstream of the second desulfurizer;a flow controller disposed on the third passage to control a flow of the hydrogen-containing gas through the third passage; anda controller including processing circuitry and a memory storing a program,wherein, at least either before generation of the hydrogen-containing gas is stopped or when the hydrogen generation device is started, the program makes the processing circuitry execute the following controls (i) and (ii) concurrently, while the reformer is generating the hydrogen-containing gas,(i) causing the switch to select the first passage, and(ii) controlling the flow controller to allow the hydrogen-containing gas to flow from the reformer to the second desulfurizer, andwherein the controls (i) and (ii) are concurrently executed in a state in which a temperature of a hydrodesulfurization catalyst is a temperature at which hydrodesulfurization is enabled to proceed. 15. The hydrogen generation device according to claim 1, further comprising a raw material supplier for adjusting a flow rate of the raw material supplied to the reformer.
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