EP0172965B1 - Continuous pan crystallizer - Google Patents

Continuous pan crystallizer Download PDF

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Publication number
EP0172965B1
EP0172965B1 EP84305974A EP84305974A EP0172965B1 EP 0172965 B1 EP0172965 B1 EP 0172965B1 EP 84305974 A EP84305974 A EP 84305974A EP 84305974 A EP84305974 A EP 84305974A EP 0172965 B1 EP0172965 B1 EP 0172965B1
Authority
EP
European Patent Office
Prior art keywords
pan
massecuite
compartment
crystallizer
compartments
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
Application number
EP84305974A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0172965A1 (en
Inventor
Peter William Rein
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.)
TONGAAT-HULETT GROUP Ltd
Original Assignee
TONGAAT-HULETT GROUP Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to ZA835372A priority Critical patent/ZA846920B/xx
Application filed by TONGAAT-HULETT GROUP Ltd filed Critical TONGAAT-HULETT GROUP Ltd
Priority to AT84305974T priority patent/ATE41788T1/de
Priority to DE8484305974T priority patent/DE3477495D1/de
Priority to EP84305974A priority patent/EP0172965B1/en
Publication of EP0172965A1 publication Critical patent/EP0172965A1/en
Application granted granted Critical
Publication of EP0172965B1 publication Critical patent/EP0172965B1/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B30/00—Crystallisation; Crystallising apparatus; Separating crystals from mother liquors ; Evaporating or boiling sugar juice
    • C13B30/02—Crystallisation; Crystallising apparatus
    • C13B30/022—Continuous processes, apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B25/00—Evaporators or boiling pans specially adapted for sugar juices; Evaporating or boiling sugar juices

Definitions

  • This invention relates to continuous pan crystallizers.
  • GB-A-378 341 discloses a continuous pan crystalliser including a plurality of compartments having calandria and defined by partitions having openings communicating between adjacent compartments. It is important that the flow system approach plug flow as closely as possible, so that crystal residence times in the continuous pan are uniform, leading to equal growth on all crystals and a uniform crystal size in the product massecuite leaving the pan.
  • One of the objects of the present invention is to provide a system for massecuite to pass from one compartment to another in such a way as to eliminate problems experienced with other types of continuous pans, such as:
  • Another object of the invention is to eliminate encrustation of sugar on baffles and other surfaces inside the pan. Such encrustation can lead to the formation of lumps or the dislodging of large pieces of encrustation which can block heating tubes or massecuite outlets.
  • a subsidiary object is to provide a condenser integral with the pan to reduce the cost of the continuous pan system.
  • a continuous pan crystalliser of the kind described at the beginning characterised in that the openings are immediately above the calandria and have baffles located on either or both sides thereof.
  • the massecuite must, therefore, have had at least one pass through the tubes of the calandria before leaving a compartment. Massecuite which passes through a said opening is directed into the downtake area of the next compartment.
  • the location of the said openings immediately above the calandria has the advantage that the turbulence and vigorous flow obtained in these zones keeps the openings free of encrustation.
  • a preferred feature of the invention is the provision of very fine water sprays onto all surfaces extending above the normal massecuite operating level. This eliminates any build-up or encrustation on these surfaces, which can otherwise lead to the formation of lumps. Because the quantity of water sprayed through the sprays is very small, it does not affect the control of the supersaturation of the mother liquor in the massecuite and the crystallisation process is not affected.
  • the continuous pan is provided with an integral condenser. This has the advantage of eliminating the costly steelwork and large diameter vapour piping required for conventional separate condensers.
  • a continous pan crystallizer includes a plurality of compartments 109 (in this case 12) as shown, having calandria 101. Seed massecuite enters the first compartment and syrup or molasses enters the crystallizer through ports 100. The massecuite passes anti-clockwise from one compartment to the next around the apparatus and leaves it through the outlet 102 (see Figure 3).
  • the openings or cross-over ports 104, 105 between adjacent compartments (1 to 12) each have a pair of baffles 106,108 which are located a short distance from the ports and above the level of the top of the tubes 110 of the calandria.
  • baffles abuts the wall of the apparatus and the other is located a short distance inwardly of the vertical edge of the ports.
  • massecuite leaving a compartment flows up the tubes between the baffle 108 andthe compartment wall, and then through the opening, or port, 104 or 105. It passes through the opening, or port, and then has to negotiate the second baffle 106 on the downstream side of the compartment 109, which directs the massecuite into the downtake.
  • baffles will differ according to the various parameters of the crystallizer and will have to be determined with a view to obtaining optimum plug flow and direction according to pan capacity and evaporation rate.
  • a preferred feature of the invention involves the installation of fine water sprays, positioned above the normal massecuite level. These sprays are so positioned as to direet a fine spray of water onto some or all of the surfaces of the compartment 109, the deflection baffles 106 and 108, and the internal surfaces of the shell of the vessel.
  • Another preferred feature of the invention is the provision of an integral condenser generally indicated by reference 112.
  • the condenser is attached to the top wall of the crystallizer and thereby obviates the expense of the complicated support means which would otherwise be necessary.
  • the condenser has an injection water inlet 114 and a vacuum connection 116 and an injection water outlet 118.
  • the condenser is conventional, preceded by an entrainment separator 126.
  • the rising vapour is contacted in the consender with a downwardly directed spray of cooling water for collection in a collector 128 for removal through outlet 118.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
EP84305974A 1983-07-22 1984-08-31 Continuous pan crystallizer Expired EP0172965B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ZA835372A ZA846920B (enExample) 1983-07-22 1983-07-22
AT84305974T ATE41788T1 (de) 1984-08-31 1984-08-31 Durchlaufender kristallisationskochapparat.
DE8484305974T DE3477495D1 (en) 1984-08-31 1984-08-31 Continuous pan crystallizer
EP84305974A EP0172965B1 (en) 1983-07-22 1984-08-31 Continuous pan crystallizer

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA835372A ZA846920B (enExample) 1983-07-22 1983-07-22
EP84305974A EP0172965B1 (en) 1983-07-22 1984-08-31 Continuous pan crystallizer
ZA846920 1984-09-04

Publications (2)

Publication Number Publication Date
EP0172965A1 EP0172965A1 (en) 1986-03-05
EP0172965B1 true EP0172965B1 (en) 1989-03-29

Family

ID=27227239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84305974A Expired EP0172965B1 (en) 1983-07-22 1984-08-31 Continuous pan crystallizer

Country Status (2)

Country Link
EP (1) EP0172965B1 (enExample)
ZA (1) ZA846920B (enExample)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1289620B1 (en) 2000-06-01 2005-11-30 The Tongaat-Hulett Group Limited Continuous vacuum pan
AP2010005385A0 (en) * 2008-01-30 2010-08-31 Tongaat Hulett Ltd Structure for use in a sugar making process.
WO2013068934A1 (en) * 2011-11-11 2013-05-16 Tongaat Hulett Limited Evaporator arrangement incorporating a condenser

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB378341A (en) * 1931-02-28 1932-08-11 Werkspoor Nv Apparatus for crystallizing sugar and other solutions by evaporation or cooling
FR1494289A (fr) * 1966-07-28 1967-09-08 Fives Lille Cail Procédé et dispositif pour empêcher l'encrassement des parois dans les appareils de cristallisation par évaporation à marche continue
FR2329317A1 (fr) * 1975-10-29 1977-05-27 Skyring Alan Evaporateur pour liquides, par exemple pour sirop de sucre
AU527620B2 (en) * 1977-06-20 1983-03-17 Evans Deakin Industries Limited Continuous crystalliser

Also Published As

Publication number Publication date
ZA846920B (enExample) 1985-03-05
EP0172965A1 (en) 1986-03-05

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