EVAPORATIVE DESALINATION DEVICE OF MULTI STAGE AND MULTI EFFECT USING SOLAR HEAT

• US 20130270100A1
• Filed: 04/13/2012
• Published: 10/17/2013
• Est. Priority Date: 04/13/2012
• Status: Active Grant

• Current Assignee: Korea Institute of Energy Research
• Original Assignee: Korea Institute of Energy Research
• Inventors: KWAK, Hee Youl, YOON, Eung Sang, JOO, Moon Chang, JOO, Hong Jin, LEE, Kyoung Ho
• Granted Patent: US 9,028,653 B2
• Time in Patent Office: Days
• US Class Current: 202/174
• CPC Class Codes: B01D 1/0035 Solar energy for treatment of water C02F1/14
• 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 1/26 Multiple-effect evaporating
• CPC Class Codes: B01D 3/065 Multiple-effect flash distillation (more than two traps)
• CPC Class Codes: B01D 5/0036 Multiple-effect condensation; Fractional condensation
• CPC Class Codes: C02F 1/14 using solar energy
• 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: C02F 2301/08 Multistage treatments, e.g. repetition of the same process step under different conditions
• CPC Class Codes: C02F 2303/10 Energy recovery
• CPC Class Codes: Y02A 20/124 Water desalination
• CPC Class Codes: Y02A 20/142 Solar thermal; Photovoltaics
• CPC Class Codes: Y02A 20/212 Solar-powered wastewater sewage treatment, e.g. spray evaporation

Abstract

Disclosed is an evaporative desalination device of multi-stage and multi-effect using solar heat constructed in multi stage and multi effect as a desalination device that is capable of not only increasing fresh water output but also resolving a problem of conventional desalination device having series structure as well, through constructing: a multi stage vapor generator that generates vapor by passing a hot water supply pipe successively through a plurality of vapor generators to evaporate sea water inside thereof; a multi effect vapor generator that uses vapor in the respective vapor generators as heat source and forms a plurality of evaporator groups; and a discharge unit that condenses vapor in the multi effect generator by sea water to discharge fresh water in liquid state, and returns and supplies portions of discharged sea water to the multi stage vapor generator and the multi effect evaporator.

Claims

1. An evaporative desalination device of multi stage and multi effect using solar heat comprising:

a multi stage vapor generator (10) that generates vapor by passing a hot water supply pipe (12) successively through a plurality of vapor generators (11) to evaporate sea water in the respective vapor generators (11);

a multi effect evaporator (20) that evaporates and desalinates sea water in the multi effect evaporator (20) by using vapor in the respective vapor generators (11) as a heat source;

a condenser (30) that cools vapor in the multi effect evaporator (20) by using sea water; and

a discharge unit (40) that discharges sea water used in the condenser (30) outside but returns and supplies some portions of the discharged sea water to the multi stage vapor generator (10) and the multi effect evaporator (20), and inhales air inside of the multi effect evaporator (20) to make vacuum state in the multi effect evaporator (20).

2. The device of claim 1, wherein the multi stage generator (10) determines a number of the vapor generators (11) according to a temperature of hot water in the hot water supply pipe (12) and the respective vapor generators (11) maintain pressure to be decreased gradually lower along an order that the hot water supply pipe (12) passes the vapor generators (11).

3. The device of claim 1, wherein the multi effect evaporator (20) comprises:

a sea water storage tank (23) that drops stored sea water through a plurality of bored holes (24);

an evaporation tube (25) where vapor from the vapor generators (11) flows in from one end thereof to evaporate the dropped sea water on an outer circumference surface of the evaporation tube (25) by heat of vapor;

a filter (26) that discharges vapor through filtering foreign substance in vapor evaporated on the evaporation tube (25); and

a fresh water storage unit (27) that is connected with the other end of the evaporation tube (25) and stores water condensed in the evaporation tube (25).

4. The device of claim 1, wherein the multi effect evaporator (20) comprises a plurality of evaporator groups (22) that use vapor of the plurality of vapor generators (11) as respective heat sources and determines numbers of evaporators (21) that are arranged continuously inside the respective evaporator groups (22) according to vapor amounts of the respective vapor generators (11).

5. The device of claim 4, wherein the evaporators (21) are arranged so that the neighboring next rear side evaporators (21) use vapor generated in front side thereof as heat sources.

6. The device of claim 1, wherein the multi effect evaporator (20) disposes the plurality of the evaporator groups (22) that construct the multi effect evaporator (20) to be arranged horizontal or vertical.

7. The device of claim 1, wherein hot water in the hot water supply pipe (12) is heated by using waste heat from solar heat or industrial process as a heat energy source.