Patent ID: 7452618

Claim:
A fuel cell cogeneration system comprising: a fuel cell connected to a fuel processing means and having a cooling water pathway, through which cooling water flows; a first heat exchanging means provided on the cooling water pathway; a stored hot water pathway through which stored hot water undergoes heat exchange with the cooling water via the first heat exchanging means; a hot water tank for storing the hot water; a stored hot water controlling means of circulating the stored hot water so as to transfer the heat of hot water stored in the stored hot water tank to the fuel cell via the stored water pathway and the first heat exchanging means during the starting of operation of the fuel cell; a stored hot water temperature measuring means of measuring the temperature of stored hot water flowing into the first heat exchanging means; a stored hot water flow rate adjusting means of adjusting the flow rate of stored hot water flowing through the stored hot water pathway; a flow rate controlling means of controlling the stored hot water flow rate adjusting means on the basis of the temperature of stored hot water measured by the stored hot water measuring means; and a second heat exchanging means connected to the stored hot water pathway upstream of the first heat exchanging means of exchanging heat with exhaust gas of the fuel processing means, wherein the flow rate controlling means controls the stored hot water flow rate adjusting means to reduce the flow rate of stored hot water flowing through the stored hot water pathway when the temperature of the stored hot water is a first predetermined temperature or less during the starting of operation of the fuel cell.