Abstract: A fuel supply device is provided capable of supplying a necessary amount of fuel while ensuring predetermined stoichiometric characteristics over a wide range of flow rates. The body unit of the fuel supply device includes the first ejector, the second ejector, and a switching valve. The switching valve has a function to select either one of a first passage or a second passage for communicating with the valve chamber and to block the other passage. The first passage is communicated with a nozzle of the first ejector, and the second passage is communicated with a nozzle of the second ejector. The first ejector has a diffuser passage communicated with the reflux chamber, the second ejector has a diffuser passage communicated with the reflux chamber, and the diffuser passage 43 and the diffuser passage are connected with a hydrogen outlet through a merging passage.

Abstract: A fuel cell power generation system comprising a reformer generating a hydrogen from base fuel to supply a fuel cell with the hydrogen, and a hydrogen reservoir connected to a first supply conduit between the reformer and the fuel cell through a second supply conduit, for storing hydrogen from the reformer as fuel cell assisting hydrogen. A distributing valve for distributing hydrogen from the reformer to the fuel cell side and the hydrogen reservoir side is provided at a connecting portion of the first and second supply conduits. The distributing valve is controlled to satisfy the amount of hydrogen required for the fuel cell and, thus, to supply the hydrogen reservoir with remaining hydrogen. This always satisfies the amount of the hydrogen required for the fuel cell corresponding to the fuel cell operation state.

Abstract: To provide a fuel circuit of the fuel cell system, wherein a fuel pump is possibly scaled down while power consumption is also possibly controlled, along with this, required amount of fuel circulation is securable in the time of the output change in a fuel cell, comprising

Abstract: A fuel cell stack 1 in a fuel-circulating fuel cell system is supplied with fuel and an oxidizing agent to generate electricity. The fuel discharged from the fuel cell stack 1 is supplied to the fuel cell stack 1 again through a fuel-circulating passage 6. In the fuel-circulating passage 6 is provided a fuel pump 3 powered from an outside source to circulate the fuel through the fuel-circulating passage 6 at a predetermined circulation rate. An ECU 4 transmits an output instruction value to the fuel cell stack 1 and regulates a circulation rate of the fuel in the fuel-circulating passage 6 according to the output instruction value.

Abstract: A variable flow-rate ejector for precisely controlling the flow rate based on pressure is disclosed. The ejector has a simple mechanical structure which comprises a nozzle for ejecting a first fluid; a diffuser into which a second fluid is drawn due to a negative pressure produced around the first fluid, where the first and second fluids are merged; a third-fluid chamber formed by first and second diaphragms attached to the needle, and the body of the ejector; and a fourth-fluid chamber formed by the second diaphragm and the body. The area of an opening around the needle in the opening at the head of the nozzle is changed by displacement of the needle along the central axis according to movement of first and second diaphragms which move in accordance with the pressure produced by the first fluid, the third fluid, and the fourth fluid.

Abstract: A fuel supply device is provided capable of supplying a necessary amount of fuel while ensuring predetermined stoichiometric characteristics over a wide range of flow rates. The body unit of the fuel supply device includes the first ejector, the second ejector, and a switching valve. The switching valve has a function to select either one of a first passage or a second passage for communicating with the valve chamber and to block the other passage. The first passage is communicated with a nozzle of the first ejector, and the second passage is communicated with a nozzle of the second ejector. The first ejector has a diffuser passage communicated with the reflux chamber, the second ejector has a diffuser passage communicated with the reflux chamber, and the diffuser passage 43 and the diffuser passage are connected with a hydrogen outlet through a merging passage.

Abstract: A fuel cell power generation system comprising a reformer generating a hydrogen from base fuel to supply a fuel cell with the hydrogen, and a hydrogen reservoir connected to a first supply conduit between the reformer and the fuel cell through a second supply conduit, for storing hydrogen from the reformer as fuel cell assisting hydrogen. A distributing valve for distributing hydrogen from the reformer to the fuel cell side and the hydrogen reservoir side is provided at a connecting portion of the first and second supply conduits. The distributing valve is controlled to satisfy the amount of hydrogen required for the fuel cell and, thus, to supply the hydrogen reservoir with remaining hydrogen. This always satisfies the amount of the hydrogen required for the fuel cell corresponding to the fuel cell operation state.