A cogeneration system of waste heat, electricity and water

Abstract

The invention discloses a waste heat electricity-water coproduction system. The water heat electricity-water coproduction system comprises a low-temperature Rankine cycle power generation system and a steam exhaust seawater desalting system. An energy staircase-type utilization system for generating the electric power by utilizing the primary waste heat and desalting the seawater by utilizing the secondary waste heat can be realized by utilizing a great amount of exhaust steam and smoke discharged from enterprises such as iron and steel, cement and petroleum chemistry. The waste heat electricity-water coproduction system is characterized in that the low-temperature seawater desalting technology for establishing a vacuum environment by utilizing the water column height and sucking the seawater by utilizing the capillary force is combined with the low-temperature Rankine cycle power generation. In the seawater desalting system, the discharge of the concentrated salty water utilizes a siphon effect, and the seawater replenishment utilizes the capillary suction force, so that no additional pump power input is needed for operating the desalting system. According to the technical scheme, a seawater desalting evaporator is used for substituting the traditional Rankine circulating condenser, so that the Rankine circulation low-temperature exhaust steam is further recycled, not only is the electricity-water coproduction realized, but also the problem of the low heat efficiency in a waste heat power generation system can be solved, and energy conservation and emission reduction can be realized.

Description

technical field [0001] The invention relates to a cogeneration system of waste heat, electricity and water, belonging to the field of waste heat utilization and energy saving and emission reduction. Background technique [0002] Seawater desalination provides an unrestricted and stable freshwater replenishment pathway and is one of the most promising approaches to address the scarcity of natural freshwater resources. Whether it is thermal method or reverse osmosis, they all consume high-grade energy in exchange for fresh water, and they are dependent on electricity. For now, it is still an energy-intensive industry, and the increasingly tense energy problem is difficult to cope with the growing demand for fresh water. The volume of traditional seawater desalination equipment is too large, the initial investment is high, and the energy consumption is high. This has always been regarded as the main problem that seawater desalination is difficult to use in large quantities. R...

AI Technical Summary

Problems solved by technology

This technical solution not only makes up for the problem of low thermal efficiency in the traditional low-temperature waste heat power generation system, but also recycles and utilizes the heat of the low-temperature exhaust steam at the outlet of the steam turbine to produce fresh water, realizes energy cascade utilization, and cogeneration of electricity and water

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