Heat recovery and utilization system

A heat recovery and utilization system comprising:

• a boiler for electricity generation;
• a heat recovery unit for recovering heat from exhaust gas of the boiler by heat exchanging between the exhaust gas and a heat medium;
• a heat exchanger for heat exchanging between the heat medium and supply water;
• a heat accumulator for storing the supply water heated by the heat exchanger to accumulate heat for equipment other than equipment for electricity generation;
• a heat medium circulation line for circulating the heat medium between the heat recovery unit and the heat exchanger;
• a supply water pipe for feeding the supply water to the heat accumulator after the supply water is passed through the heat exchanger;
• a first water pump for pressure-feeding supply water to the heat exchanger, in which the supply water is heated by the heat medium and then is fed to the heat accumulator, the first water pump being disposed on the supply water pipe upstream of the heat exchanger;
• and
• a second water pump for pressure-feeding the heated supply water from the heat accumulator to the heat exchanger through a startup water supply pipe, which is connected to the supply water pipe at a position between the heat exchanger and the first water pump,
• wherein the heated supply water stored in the heat accumulator is supplied to the heat exchanger through the startup water supply pipe, such that the heat exchanger heats the heat medium circulating in the heat medium circulation line and preheats the heat recovery unit at a time of startup of the system.