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Abstract

The Cryo-Thermo Desalinator (CTD) is a “fire and ice” approach to potability and water reuse using liquid natural gas (LNG) for systemic fuel and cooling. The upstream key heat exchanger (HX) uses LNG to differentiate raw water into pretreated ice melt and cryo-brine blowdown. Ice melt-diluted raw water is primarily sent to the mid-stream key HX condenser where it and LNG tube bundles collapse water vapor into potable water. The downstream key HX uses LNG to separate cryo-brine and thermo-brine into heavy brine and skimmed saline ice which is reinjected into pretreated raw water for maximum corrosion and scaling dilution and extra potability. Heavy brine discharge is more easily dewatered for mining salts, mineral and elements. Pressurized LNG, becoming high pressure natural gas, adds desirable latent heat of vaporization to downstream gas users, including the integrated CCGT/HRSG and is roughly-proportional to thirsty residential/industrial gas users which the CTD serves.

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First Claim