Fuel tank, fuel cell system, and hydrogen gas generator

A hydrogen gas generator comprising:

• a pressure tank including a space configured to accommodate dimethyl ether and water;
• a dividing portion dividing the space into spaces so that when one of the spaces is increased in volume, the other of the spaces is decreased in volume and so that the one of the spaces is configured to accommodate dimethyl ether and the other of the spaces is configured to accommodate water;
• a first outlet provided on the pressure tank so that the one of the spaces can be opened and dimethyl ether taken out therethrough;
• a second outlet provided on the pressure tank so that the other of the spaces can be opened and water taken out therethrough;
• a reforming portion configured to use dimethyl ether and water to obtain a reformed gas containing hydrogen with carbon monoxide (CO);
• and
• a CO removing portion that is configured to remove at least a part of the CO contained in the reformed gas.

A fuel cell system comprising:

• a pressure tank including a space configured to accommodate dimethyl ether and water;
• a dividing portion dividing the space into spaces so that when one of the spaces is increased in volume, the other of the spaces is decreased in volume and so that the one of the spaces is configured to accommodate dimethyl ether and the other of the spaces is configured to accommodate water;
• a first outlet provided on the pressure tank so that the one of the spaces can be opened and dimethyl ether taken out therethrough;
• a second outlet provided on the pressure tank so that the other of the spaces can be opened and water taken out therethrough;
• a reforming portion configured to use dimethyl ether and water to obtain a reformed gas containing hydrogen with carbon monoxide (CO);
• a CO removing portion that is configured to remove at least a part of the CO contained in the reformed gas;
• and
• a fuel cell that is configured to use hydrogen contained in the reformed gas and oxygen in the atmosphere to generate electric power.