US3203464A - Flash evaporator - Google Patents

Flash evaporator Download PDF

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Publication number
US3203464A
US3203464A US236919A US23691962A US3203464A US 3203464 A US3203464 A US 3203464A US 236919 A US236919 A US 236919A US 23691962 A US23691962 A US 23691962A US 3203464 A US3203464 A US 3203464A
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US
United States
Prior art keywords
channel
chambers
evaporator
chamber
flash
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US236919A
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English (en)
Inventor
Kingma Wouter Gerhard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Werkspoor NV
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Werkspoor NV
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Publication date
Application filed by Werkspoor NV filed Critical Werkspoor NV
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/06—Flash distillation
    • B01D3/065—Multiple-effect flash distillation (more than two traps)
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/06—Flash evaporation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B27/00—Instantaneous or flash steam boilers
    • F22B27/16—Instantaneous or flash steam boilers involving spray nozzles for sprinkling or injecting water particles on to or into hot heat-exchange elements, e.g. into tubes

Definitions

  • the invention relates to a flash evaporator provided with a number of flash chambers arranged horizontally downstream of each other, each chamber being connected near its bottom to the adjacent chamber and in each of the chambers reigning such a pressure that the absolute pressure in the evaporator decreases in the direction of the liquid outlet.
  • the invention has for its object to improve an evaporat-or of this type in such a way that the evaporator can operate with a relatively small liquid content and with relatively large specific loads.
  • the connecting channel between one chamber and the next one is constituted by a plate extending horizontally at some distance above the common bottom of the chambers, said plate at the end reaching into the adjacent downstream chamber being prolonged by an upwardly inclined part.
  • vapor is generated in the channel formed by said plate, so that the volume of the liquid is increased and the mixture of liquid and vapor flows out the channel into the adjacent chamber with a large velocity.
  • the channel is widened by the upwardly inclined part of .the plate the mixture gradually expands and the liquid is split up in large drops whereby the liquid presents a large surface area. Therefore, flashing occurs at small pressure drops between successive chambers so that the evaporator may operate with large specific loads.
  • FIG. 1 is a longitudinal section through a number of flash chambers of an evaporator
  • FIG. 2 is a sectional view on a larger scale through the connecting channel between two chambers;
  • FIG. 3 is a view corresponding with FIG. 2 in another embodiment of the connecting channel
  • FIG. 4 is a sectional view taken on line 44 of FIG. 1.
  • the chambers arranged downstream of each other have a common plane bottom 1.
  • the chambers are formed by partitions 2.
  • Each partition 2 joins with a horizontal plate 3 which leaves a slot like channel 4 with reference to the bottom.
  • the plate 3 has an upwardly inclined part 5 and 6 respectively, so that the downstream part of the channel has the form of a diffusor.
  • a transverse projection 7, (2.5;. in the form of a low threshold or of a round bar.
  • the upper regions of the chambers are crossed by horizontal pipes 9 which carry cooling water and form the condensors separated from the chambers by a wall 10, but connected with each other by overflow pipes 11 for the condensate.
  • the non-condensable gases are exhausted at 14. From the last condensor the condensate is carried off by duct 13.
  • the pipes 9 extend through holes in the partitions 2.
  • a downwardly inclined guide plate 8 which receives the spray leaving the channel 4 and guides the liquid to the entrance of the next channel 4.
  • the guide plate 8 prevents that the spray leaving the ice channel 4 will contact the vertical partition 2, which would cause the forming of a mist.
  • the vapour which is substantially free of mist can flow at both ends of the guiding plate 8, through the passages left by the guiding plate with respect to the plates 3, to the condensor via an opening 12.
  • the openings 12 are provided in a longitudinal wall of a casing enclosing the bank of pipes 9 and having its bottom constituted by the wall 10, as shown in FIG. 4. Because this opening 12 lies immediately downstream the vertical partition 2 the ascending vapour has to change its direction, so that the separation of liquid from the vapour is promoted. To this effect also a dropcollector can be arranged below the opening 12.
  • the channel 4 can have the form of a venturi. This form is very advantageous in the case of large temperature differences of 5 to 10 C. between the chambers.
  • the bottom 1 of the chambers can also have a very slight slope.
  • the described evaporator is not only suited for water like liquids but also for more viscous liquids, e.g. for preparing the feeding in catalytic cracking processes in the oil-industry and for the evaporation of strongly foaming solutions, e.g. coagulating liquids, because eventually formed foam is destroyed by the spray of large drops. Due to the spraying of the foam the concentration of surface active agents, in the foam remains low, so that the foam is mechanically less strong.
  • the flash chambers can be much smaller than in the normal circulationor flowthrough evaporators with external vapour separator.
  • a flash evaporator comprising a plurality of flash chambers arranged substantially horizontally downstream of each other on a common bottom, each said chamber being connected near its bottom with the adjacent chamber by a channel so constructed and arranged that the absolute pressure in the evaporator decreases in the downstream direction, each said connecting channel having one wall formed by said common bottom of the cham- Hers and a second wall formed by an imperforate plate spaced above the common bottom and extending horizontally from the interior of one chamber into the interior of the adjacent chamber, and each of said plates at the end reaching into the adjacent downstream chamber being prolonged by an upwardly inclined part forming a downstream-facing dihedral .angle with said common bottom.
  • each of said plates at its end reaching into the adjacent upstream chamber is also prolonged by an upwardly inclined part forming an upstream-facing dihedral angle with said common bottom.
  • a flash evaporator as claimed in claim 1 wherein a substantially horizontal guide plate is arranged in each chamber, said guide plates being spaced from the ends of said plates forming part of the connecting channels between chambers to leave passages for vapor to move up- 10 wardly.
  • a flash evaporator according .to claim 4 wherein each of said guide plates is slightly inclined downwardly in the downstream direction.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US236919A 1961-11-17 1962-11-13 Flash evaporator Expired - Lifetime US3203464A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL271501 1961-11-17

Publications (1)

Publication Number Publication Date
US3203464A true US3203464A (en) 1965-08-31

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US236919A Expired - Lifetime US3203464A (en) 1961-11-17 1962-11-13 Flash evaporator

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US (1) US3203464A (en))
DE (1) DE1191787B (en))
GB (1) GB980711A (en))
NL (2) NL271501A (en))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306346A (en) * 1962-12-03 1967-02-28 Donald F Othmer Method for cooling volatile liquids
US3336966A (en) * 1965-06-22 1967-08-22 Aqua Chem Inc Flow control means for multi-stage flash evaporators
US3427227A (en) * 1967-01-25 1969-02-11 Westinghouse Electric Corp Flash evaporator with duct and baffle means
US3488260A (en) * 1965-04-05 1970-01-06 American Mach & Foundry Flash evaporators
US3879265A (en) * 1972-08-28 1975-04-22 Atomenergi Ab Apparatus for evaporating liquids
US9440164B2 (en) 2011-09-14 2016-09-13 Aquasource Technologies Corporation System and method for water treatment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US445266A (en) * 1891-01-27 Evaporator or sirup-pan
US2168875A (en) * 1937-07-08 1939-08-08 Socony Vacuum Oil Co Inc Method of treating oils
US2446997A (en) * 1943-03-11 1948-08-17 Atomic Energy Commission Molecular distillation process and apparatus for the separation of isotopes, etc.
GB831478A (en) * 1957-05-25 1960-03-30 G & J Weir Ltd Improvements in or relating to evaporators
US2944599A (en) * 1956-04-04 1960-07-12 Richardsons Westgarth & Co Flash evaporator
GB855550A (en) * 1957-05-27 1960-12-07 Richardsons Westgarth & Co Improvements in or relating to evaporators

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US445266A (en) * 1891-01-27 Evaporator or sirup-pan
US2168875A (en) * 1937-07-08 1939-08-08 Socony Vacuum Oil Co Inc Method of treating oils
US2446997A (en) * 1943-03-11 1948-08-17 Atomic Energy Commission Molecular distillation process and apparatus for the separation of isotopes, etc.
US2944599A (en) * 1956-04-04 1960-07-12 Richardsons Westgarth & Co Flash evaporator
GB831478A (en) * 1957-05-25 1960-03-30 G & J Weir Ltd Improvements in or relating to evaporators
DE1090178B (de) * 1957-05-25 1960-10-06 G & J Weir Ltd Mehrstufen-Verdampfer
GB855550A (en) * 1957-05-27 1960-12-07 Richardsons Westgarth & Co Improvements in or relating to evaporators

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306346A (en) * 1962-12-03 1967-02-28 Donald F Othmer Method for cooling volatile liquids
US3488260A (en) * 1965-04-05 1970-01-06 American Mach & Foundry Flash evaporators
US3336966A (en) * 1965-06-22 1967-08-22 Aqua Chem Inc Flow control means for multi-stage flash evaporators
US3427227A (en) * 1967-01-25 1969-02-11 Westinghouse Electric Corp Flash evaporator with duct and baffle means
US3879265A (en) * 1972-08-28 1975-04-22 Atomenergi Ab Apparatus for evaporating liquids
US9440164B2 (en) 2011-09-14 2016-09-13 Aquasource Technologies Corporation System and method for water treatment
US9440163B2 (en) 2011-09-14 2016-09-13 Aquasource Technologies Corporation System and method for water treatment
US9440162B2 (en) 2011-09-14 2016-09-13 Aquasource Technologies Corporation System and method for water treatment
US9527005B2 (en) 2011-09-14 2016-12-27 Aquasource Technologies Corporation System and method for water treatment
US10092851B2 (en) 2011-09-14 2018-10-09 Aquasource Technologies Corporation System and method for water treatment

Also Published As

Publication number Publication date
DE1191787B (de) 1965-04-29
GB980711A (en) 1965-01-20
NL271501A (en))
NL120969C (en))

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