Water-electricity cogeneration system for concentrating solution by gradient utilization of flue gas waste heat

The utility model discloses a water and electricity cogeneration system for concentrating a solution by gradient utilization of flue gas waste heat, and belongs to the field of energy and power. The system is characterized in that the inorganic salt dilute solution (2) absorbs the heat of the flue gas (1) in the heater (9) to realize waste heat recovery. The heated dilute solution enters a humidifying tower (10); the temperature of the air (3) rises, the moisture content is increased, then the air (3) enters the heat exchanger (13) to transfer heat and mass with the organic working medium (4),the temperature of the air (3) is reduced, moisture is separated out, the low-temperature air (3) enters the gas-liquid separator (14), and the separated air enters the humidifying packed tower (10)again through the fan (15) to start the next cycle. According to the system, by means of the difference of humidity carrying capacities of air at different temperatures, heat and mass transfer is conducted through direct conta