Method for desalination

• US 10,457,568 B2
• Filed: 04/03/2015
• Issued: 10/29/2019
• Est. Priority Date: 04/11/2014
• Status: Active Grant

• Current Assignee: Murdoch University, National Centre of Excellence in Desalination Australia
• Original Assignee: Murdoch University, National Centre of Excellence in Desalination Australia
• Inventors: Rahimi, Bijan, Chua, Hui Tong, Christ, Alexander
• Primary Examiner(s): Robinson, Renee
• Assistant Examiner(s): Mueller, Derek N
• Application Number:
  US15/303,262
• Publication Number:
  US 20170029290A1
• Time in Patent Office: 1,670 Days
• CPC Class Codes: B01D 1/0058 Use of waste energy from other processes or sources, e.g. combustion gas for water treatment C02F1/16
• CPC Class Codes: B01D 3/065 Multiple-effect flash distillation (more than two traps)
• CPC Class Codes: B01D 3/146 Multiple effect distillation
• CPC Class Codes: C02F 1/041 by means of vapour compression
• CPC Class Codes: C02F 1/06 Flash evaporation
• CPC Class Codes: C02F 1/16 using waste heat from other processes
• CPC Class Codes: C02F 2103/08 Seawater, e.g. for desalination
• CPC Class Codes: Y02A 20/124 Water desalination

Abstract

The invention discloses a method of removing dissolved elements from a liquid. The method comprises a first heating step for heating the liquid using a first heat source, a plurality of distillation steps for purifying the liquid heated by the first heating step, each of the plurality of distillation steps comprising at least one evaporation step and at least one condensation step, and a second heating step, using a second heat source to heat a plurality of flashing chambers, each generating a volume of vapor; wherein the vapor from at least one of the plurality of flashing chambers of the second heating step is introduced into at least one of the plurality of distillation steps.

Claims

1. A method of removing dissolved elements from a liquid, the method comprising:

a) heating the liquid in a first heating step using a first heat source;

b) introducing said heated liquid from the first heating step into a plurality of distillation steps for purifying the liquid heated by the first heating step, each of the plurality of distillation steps comprising at least one evaporation step and at least one condensation step, each of the plurality of distillation steps producing a distillate and a residual concentrate; and

c) a second heating step for heating an additional volume of liquid;

d) introducing heated liquid from the second heating step into a plurality of flashing chambers, each generating a volume of vapor;

wherein at least a portion of the vapor from at least one of the plurality of flashing chambers is introduced into at least one of the plurality of distillation steps through one of a plurality of inputs consisting of a first input and a series of subsequent inputs, the vapor being introduced having a higher temperature than the temperature in the distillation step that is being introduced into.

2. The method of claim 1, wherein temperature of the generated vapor introduced into the distillation chambers decreases from the first input to the last input of the plurality of inputs.

3. The method according to claim 1, wherein the first heating step uses a first heat exchanger for heating the liquid.

4. The method according to claim 1, wherein the unused heat from the first heating step is utilized in the second heating step.

5. The method according to claim 1, wherein the residual concentrate from the plurality of flashing chambers is recirculated in the plurality of flashing chambers.

6. The method according to claim 1, wherein the residual concentrate from the plurality of flashing chambers is introduced into at least one of the plurality of distillation steps as feed liquid.

7. The method according to claim 1, further comprising using part of the heat from the residual concentrate of the plurality of flashing chambers to preheat feed liquid.

8. The method according to claim 1, wherein the second heat source is introduced into at least one of the plurality of distillation steps.

9. The method according to claim 1, wherein the plurality of distillation steps is a MultiEffect Distillation (MED) process.

10. The method according to claim 1, wherein the at least one distillation step is a Multi-Stage Flash Distillation (MSF) process.

11. The method according to claim 1, wherein at least one heating step includes vapor Compression.