A system and process for simultaneously desalinating seawater and generating electricity using geothermal resources

Abstract

The invention discloses a system and technology for carrying out sea water desalination and generating at the same time by utilizing a geothermal resource. The system comprises a sea water taking unit, a raw water pre-treatment unit arranged below sea level, a geothermal heat removing unit as well as a raw water replenishing unit, a reverse osmosis unit, a fresh water lifting unit and a hydraulic generating unit which keep appropriate head fall with the raw water pre-treatment unit, wherein a water diversion pipeline of the hydraulic generating unit is communicated with the sea water taking unit, a tail water pipeline of the hydraulic generating unit is respectively communicated with the raw water replenishing unit and the fresh water lifting unit; the geothermal heat removing unit respectively outputs heat energy to the raw water replenishing unit and the fresh water lifting unit by virtue of a heating pipeline; after sea water is treated by the raw water pre-treatment unit, generating is carried out firstly by virtue of water potential energy, then pressure of tail water after generating is supplemented by the raw water replenishing unit, the sea water is subjected to reverse osmosis desalination, then raw water is separated into fresh water and strong brine, geothermal heat energy-water potential energy-electric energy conversion is realized, and the social problems of scare fresh water and lack of low-carbon generating at present are solved.

Description

technical field [0001] The invention belongs to the application fields of seawater desalination, geothermal energy and water potential energy, and in particular relates to a system and a process for simultaneously performing seawater desalination and power generation by using geothermal resources. Background technique [0002] At present, international and domestic seawater desalination is mainly divided into two categories: distillation (thermal method) and reverse osmosis (membrane method). Pressure steam distillation, dew point evaporation, water and electricity cogeneration, thermal film cogeneration and the use of nuclear energy, solar energy, wind energy, tidal energy, water column potential energy seawater desalination technology, etc. [0003] After half a century of development, an industrial technology with multi-stage flash evaporation, multi-effect distillation and reverse osmosis as the mainstream has been formed. From a regional point of view, the Gulf countri...

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Problems solved by technology

[0006] In order to solve the technical problem of large heat energy or electric energy consumption in the process of seawater desalination and freshwater upgrading in the known technology, the present invention provides a system and process for simultaneously desalinating seawater and generating electricity by using geothermal resources. Due to the geothermal conditions of the city, a large amount of geothermal clean energy is introduced in the process of reverse osmosis seawater desalination. It can use non-fuel and non-electricity combined with the natural water column potential energy of high-rise buildings and deep wells to realize seawater desalination, upgrading and power generation, replacing ordinary power consumption. or a method of desalination of seawater that consumes fuel

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