Waste flue gas waste heat cascade recovery hydropower generation system and working method

Abstract

The invention discloses a waste flue gas waste heat cascade recovery hydropower generation system and a working method, and belongs to the field of energy and power. The waste flue gas waste heat cascade recovery hydropower generation system comprises an evaporator (6), a turbine (7), a motor (8), a condenser (9), a working medium pump (10), a brine pump (11), a humidification packed tower (12), astrong brine storage tank (13), a tube type heat exchanger (14), a draught fan (15), a fresh water storage tank (16), a cooler (17), a water pump (18), a three-way valve (19) and a fresh water storage tank (20). Through the waste flue gas waste heat cascade recovery hydropower generation system, cascade recovery of the waste heat of waste flue gas (1) is realized, refrigerants (2) circularly provide the heat for heating weak brine (3), and low-temperature air (4) provides the cooling capacity for cooling fresh water (5). The waste flue gas waste heat cascade recovery hydropower generation system is simple in structure, easy to operate and low in energy dissipation, achieves cascade recovery of the waste heat of the waste flue gas, improves energy utilization efficiency and realizes energyconservation and emission reduction.

Description

technical field [0001] The invention relates to a cascaded waste flue gas waste water cogeneration system and a working method, which belong to the field of energy and power. Background technique [0002] Waste flue gas waste heat recovery is an important way to achieve energy saving and emission reduction. It can not only significantly improve the economic benefits of enterprises, but also relates to the vital interests of everyone. Under the background of national energy structure adjustment and industrial structure upgrading, high-efficiency recovery of waste flue gas and cogeneration technology of waste heat and power have attracted attention from all aspects. [0003] Low-temperature economizer technology is often used for waste heat recovery of traditional waste flue gas. The low-temperature economizer scheme is to use condensed water to absorb the exhaust gas heat in the low-temperature economizer, reduce the exhaust gas temperature, and then return to the low-pressu...

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Problems solved by technology

Electrodialysis requires a high-pressure pump to desalinate brine, which requires high equipment and poor operability; reverse dialysis needs to consume electric energy to build an electrolytic cell, so that ions move to both sides to achieve desalination of brine, consuming high-grade electric energy; multi-stage flash evaporation High-temperature steam needs to be provided from the outside, so the thermal economy is limited by the scale; the performance of the multi-effect evaporation method is affected by the number of effects of the system. If the number of effects is increased to improve performance, the production cost will increase significantly

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