Transiently-operated desalination systems with heat recovery and associated methods

Patent metadata

Field	Value
Publication number	US-9617169-B2
Application number	US-201614992244-A
Country	US
Kind code	B2
Filing date	Jan 11, 2016
Priority date	May 21, 2015
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

Systems and methods related to desalination systems are described herein. According to some embodiments, the desalination systems are transiently operated and/or configured to facilitate transient operation. In some embodiments, a liquid stream comprising water and at least one dissolved salt is circulated through a fluidic circuit comprising a desalination system. In some embodiments, a portion of the desalination system (e.g., a humidifier) is configured to remove at least a portion of the water from the liquid stream to produce a concentrated brine stream enriched in the dissolved salt. In certain cases, the concentrated brine stream is recirculated through the fluidic circuit until the concentrated brine stream reaches a relatively high density (e.g., at least about 10 pounds per gallon) and/or a relatively high salinity (e.g., a total dissolved salt concentration of at least about 25 wt %). In certain embodiments, additional salt is added to the concentrated brine stream to produce an ultra-high-density brine stream (e.g., a brine stream having a density of at least about 11.7 pounds per gallon). Some aspects relate to a system that is configured to promote energy efficiency by recovering heat from the recirculated concentrated brine stream upon discharge from the fluidic circuit.

First claim

What is claimed is:

1. A method for producing a concentrated brine stream, comprising:
supplying a first liquid stream comprising water and a dissolved salt at an initial concentration to a fluidic circuit comprising a desalination system, wherein the desalination system removes at least a portion of the water from the first liquid stream to produce a first concentrated brine stream comprising water and the dissolved salt at a second concentration higher than the initial concentration of the first liquid stream;
recirculating the first concentrated brine stream through the fluidic circuit to remove at least a portion of the water from the first concentrated brine stream, forming a recirculated first concentrated brine stream comprising water and the dissolved salt at a third concentration higher than the second concentration of the first concentrated brine stream;
discharging the recirculated first concentrated brine stream from the fluidic circuit when the recirculated first concentrated brine stream reaches a density of at least about 10 pounds per gallon, wherein discharging the recirculated first concentrated brine stream comprises flowing the recirculated first concentrated brine stream through a first portion of a heat exchanger;
supplying a second liquid stream comprising water and a dissolved salt at an initial concentration to the fluidic circuit comprising the desalination system, wherein supplying the second liquid stream comprises flowing the second liquid stream through a second portion of the heat exchanger, wherein heat is transferred from the recirculated first concentrated brine stream to the second liquid stream in the heat exchanger, and wherein the desalination system removes at least a portion of the water from the second liquid stream to produce a second concentrated brine stream comprising water and the dissolved salt at a second concentration higher than the initial concentration of the second liquid stream;
recirculating the second concentrated brine stream through the fluidic circuit to remove at least a portion of the water from the second concentrated brine stream, forming a recirculated second concentrated brine stream comprising water and the dissolved salt at a third concentration higher than the second concentration of the second concentrated brine stream; and
discharging the recirculated second concentrated brine stream from the fluidic circuit when the recirculated second concentrated brine stream reaches a density of at least about 10 pounds per gallon.

2. The method according to claim 1 , wherein the recirculated first concentrated brine stream has a salinity of at least about 25% upon discharge from the fluidic circuit and/or the recirculated second concentrated brine stream has a salinity of at least about 25% upon discharge from the fluidic circuit.

3. The method according to claim 1 , further comprising pre-treating the first liquid stream and/or the second liquid stream to remove at least a portion of at least one scale-forming ion.

4. The method according to claim 1 , further comprising pre-treating the first liquid stream and/or the second liquid stream to remove at least a portion of a suspended and/or emulsified immiscible phase.

5. The method according to claim 1 , further comprising pre-treating the first liquid stream and/or the second liquid stream to remove at least a portion of suspended solids.

6. The method according to claim 1 , further comprising precipitating at least a portion of the salt from the first concentrated brine stream and/or the recirculated first concentrated brine stream; and/or precipitating at least a portion of the salt from the second concentrated brine stream and/or the recirculated second concentrated brine stream.

7. A method for producing a concentrated brine stream, comprising:
supplying a first liquid stream comprising water and a dissolved salt at an initial concentration to a feed tank;
flowing the first liquid stream from the feed tank to a fluidic circuit comprising a desalination system, wherein the desalination system removes at least a portion of the water from the first liquid stream to produce a first concentrated brine stream comprising water and the dissolved salt at a second concentration higher than the initial concentration of the first liquid stream;
recirculating the first concentrated brine stream through the fluidic circuit to remove at least a portion of the water from the first concentrated brine stream, forming a recirculated first concentrated brine stream comprising water and the dissolved salt at a third concentration higher than the second concentration of the first concentrated brine stream;
discharging the recirculated first concentrated brine stream from the fluidic circuit when the recirculated first concentrated brine stream reaches a density of at least about 10 pounds per gallon, wherein discharging the recirculated first concentrated brine stream comprises flowing the recirculated first concentrated brine stream through a first portion of a heat exchanger to a concentrated brine tank;
supplying a second liquid stream comprising water and a dissolved salt at an initial concentration to the feed tank, wherein supplying the second liquid stream comprises flowing the second liquid stream through a second portion of the heat exchanger, wherein heat is transferred from the recirculated first concentrated brine stream to the second liquid stream in the heat exchanger;
flowing the second liquid stream from the feed tank to the fluidic circuit comprising the desalination system, wherein the desalination system removes at least a portion of the water from the second liquid stream to produce a second concentrated brine stream comprising water and the dissolved salt at a second concentration higher than the initial concentration of the second liquid stream;
recirculating the second concentrated brine stream through the fluidic circuit to remove at least a portion of the water from the second concentrated brine stream, forming a recirculated second concentrated brine stream comprising water and the dissolved salt at a third concentration higher than the second concentration of the second concentrated brine stream;
discharging the recirculated second concentrated brine stream from the fluidic circuit when the recirculated second concentrated brine stream reaches a density of at least about 10 pounds per gallon, wherein discharging the recirculated second concentrated brine stream comprises flowing the recirculated second concentrated brine stream through the first portion of the heat exchanger to the concentrated brine tank; and
flowing a first volume of liquid from the concentrated brine tank to the first portion of the heat exchanger while flowing a second volume of liquid from the feed tank to the second portion of the heat exchanger, wherein heat is transferred from the first volume of liquid to the second volume of liquid.

8. The method according to claim 7 , wherein the recirculated first concentrated brine stream and/or recirculated second concentrated brine stream has a salinity of at least about 25% upon discharge from the fluidic circuit.

9. The method according to claim 7 , further comprising pre-treating the first liquid stream and/or the second liquid stream to remove at least a portion of at least one scale-forming ion.

10. The method according to claim 7 , further comprising pre-treating the first liquid stream and/or the second liquid stream to remove at least a portion of a suspended and/or emulsified immiscible phase and/or at least a portion of suspended solids.

11. The method according to claim 7 , further comprising precipitating at least a portion of the salt from the first conce

Assignees

• Gradiant Corp

Inventors

• Govindan Prakash Narayan
• St John Maximus G
• Lam Steven
• Zaloudek Mark
• Chehayeb Karim M
• Shah Samar

Classifications

• C02F5/02

  Softening water by precipitation of the hardness · CPC title

• C02F1/52

  by flocculation or precipitation of suspended impurities {(C02F1/463 takes precedence)} · CPC title

• B01D3/16

  Fractionating columns in which vapour bubbles through liquid (packing elements B01J19/30, B01J19/32) · CPC title

• C02F1/5236

  using inorganic agents · CPC title

• C02F2101/101

  Sulfur compounds · CPC title