Water-power cogeneration system for recovering waste heat of concentrated seawater of desalination and method of system

Abstract

The invention relates to a water-power cogeneration system for recovering waste heat of concentrated seawater of desalination and a method of the system, and belongs to the fields of energy and power. The system is characterized by comprising an organic Rankine cycle subsystem; the organic Rankine cycle subsystem comprises a waste heat recoverer for recovering heat carried by the concentrated seawater discharged by a desalination system, an organic turbine regulating valve connected with an outlet of the waste heat recoverer, an organic turbine connected with an outlet of the regulating valve, a steam exhaust regulating valve connected with an outlet of the organic turbine, a heat regenerator connected with the outlet of the steam exhaust regulating valve, and an air cooling condenser connected with an outlet of the heat regenerator; the air cooling condenser is connected with a liquid phase inlet of the waste heat recoverer through an organic working medium pump. The heat carried by the concentrated seawater discharged by the desalination system is fully utilized, so that comprehensive utilization efficiency of heat energy is increased; the turbine cooling an organic working medium with air is adopted to exhaust steam, so that cooling water is saved greatly; the system follows the principle of gradient utilization of energy, and is in line with national objectives of energy conservation and emission reduction and sustainable development strategy of water resources.

Description

technical field [0001] The invention relates to a hydropower cogeneration system and a method for recovering waste heat from humidification, dehumidification, seawater desalination and desalination of concentrated seawater, and belongs to the field of waste heat recovery from medium and low temperature heat sources and power engineering. Background technique [0002] The traditional humidification and dehumidification seawater desalination method is usually carried out under normal pressure. After the hot seawater spray heated by the collector is mixed with the cold air to generate humid air, at the same time the concentrated seawater is directly discharged into the atmosphere. The temperature of seawater is still relatively high, and direct discharge will cause heat loss, which will seriously affect the heat energy utilization efficiency of the seawater desalination system, and will also cause thermal pollution to the environment. Therefore, it is an effective way to improv...

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Problems solved by technology

However, the research on the waste heat recovery of concentrated hot seawater in the humidification and dehumidification seawater desalination system has not attracted much attention.

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