WO2011135589A2 - Système d'évaporation - Google Patents

Système d'évaporation Download PDF

Info

Publication number
WO2011135589A2
WO2011135589A2 PCT/IN2011/000293 IN2011000293W WO2011135589A2 WO 2011135589 A2 WO2011135589 A2 WO 2011135589A2 IN 2011000293 W IN2011000293 W IN 2011000293W WO 2011135589 A2 WO2011135589 A2 WO 2011135589A2
Authority
WO
WIPO (PCT)
Prior art keywords
evaporator
stillage
evaporation system
vapor
heat
Prior art date
Application number
PCT/IN2011/000293
Other languages
English (en)
Other versions
WO2011135589A3 (fr
Inventor
Govind Pandurang Misale
Abhay Prabhakar Deeshpande
Vidya Murkumbi
Abhay Agarwal
Original Assignee
Shree Renuka Sugars Limited
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
Application filed by Shree Renuka Sugars Limited filed Critical Shree Renuka Sugars Limited
Publication of WO2011135589A2 publication Critical patent/WO2011135589A2/fr
Publication of WO2011135589A3 publication Critical patent/WO2011135589A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/26—Multiple-effect evaporating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/22—Evaporating by bringing a thin layer of the liquid into contact with a heated surface

Definitions

  • the present invention relates to an evaporation system.
  • Evaporation is a type of vaporization of a liquid that occurs only on the surface of a liquid. It is the process by which molecules in a liquid state spontaneously become gaseous.
  • Natural circulation evaporators are based on the natural circulation of the product caused by the density differences that arise from heating. In an evaporator using tubing, after the water begins to boil, bubbles will rise and cause circulation which facilitates the separation of the liquid and the vapor at the top of the heating tubes. The amount of evaporation that takes place depends on the temperature difference between the steam and the solution. Problem in this system arises if the tubes are not well-immersed in the solution which in turn results in drying of the system. In order to avoid this, forced circulation can be used by inserting a pump to increase pressure and circulation. Other problems associated with this system are that the residing time is undefined and the consumption of steam is very high.
  • This type of evaporator is generally made of long tubes (4-8 meters in length) which are surrounded by steam jackets.
  • the uniform distribution of the solution is important when using this type of evaporator.
  • the solution enters and gains velocity as it flows downward. This gain in velocity is attributed to the vapor being evolved against the heating medium, which flows downward as well.
  • This evaporator is usually applied to highly viscous solutions and is frequently used in the chemical, food and fermentation industry.
  • Plate evaporators have a relatively large surface area.
  • the plates are usually corrugated and are supported by frame.
  • steam flows through the channels formed by the free spaces between the plates.
  • the steam alternately climbs and falls parallel to the concentrated liquid.
  • the steam follows a co-current, counter-current path in relation to the liquid.
  • the concentrate and the vapor are both fed into the separation stage where the vapor is sent to a condenser.
  • Plate evaporators are frequently used in the dairy and fermentation industries since they have spatial flexibility. A negative point of this type of evaporator is that it is limited in its ability to treat viscous or solid-containing products.
  • these evaporators can be made of up to seven evaporator stages or effects.
  • the energy consumption for single-effect evaporators is very high and makes up most of the cost for an evaporation system. Putting together evaporators saves heat and thus requires less energy. Adding one evaporator to the original decreases the energy consumption to 50% of the original amount. Adding another effect reduces it to 33% and so on.
  • a heat saving % equation can be used to estimate how much one will save by adding a certain amount of effects.
  • the number of effects in a multiple-effect evaporator is usually restricted to seven because after that, the equipment cost starts catching up to the money saved from the energy requirement drop.
  • Evaporation system has importance in the distillery process as the pollution part is concerned.
  • the major role of this system is to reduce the stillage generation in the plant itself.
  • evaporating systems such as rising film evaporators, batch type evaporators and falling film evaporators.
  • United States Patent 4217176 discloses an evaporator which includes vertically oriented vessel having a longitudinal axis, heat exchange means disposed within said vessel and intermediate the ends thereof and including a plurality of generally horizontally extending heat exchange tubes and a pair of tube sheet means arranged in spaced relation for supporting said heat exchange tubes, a plurality of partition means disposed adjacent said heat exchange tubes and engaging with said tube sheet means for defining an evaporating space.
  • United States Patent 4132587 discloses apparatus for evaporating liquids which comprises a chamber having an inlet for hot vapors, an outlet adjacent the bottom of said chamber for discharge of condensed vapors, a plurality of cylindrical vertical tubes of relatively small diameter occupying said chamber so that said vapors contact the outside surface thereof, means for passing liquid through said vertical tubes, said liquid being heated and at least partially vaporized by heat transfer from said vapors which are condensed as a film which flows down the outside of said vertical tubes, means for receiving said heated liquid and its vapors, and horizontal plate means perpendicular to said vertical tubes, said horizontal plate having holes therein receiving and contacting said vertical tubes in liquid-tight manner so as to prevent any condensed vapors from continuing to flow beyond said horizontal plate means.
  • United States Patent application 20070051612 discloses heat exchanger and stillage evaporator for the treatment of stillage generated by the tequila industry during distillation and mashing.
  • the stillage evaporator comprising an elbow, which is located at the top to connect to the evaporator with a cyclone, and a vapor lock lid to avoid internal pressure and accumulation of solid material on the walls of the evaporator, the vapor lock lid having an inlet on top on the right-hand side so that the cleaning operation can be performed and on the left-hand side a safety valve to release pressure during the evaporation operation.
  • This lid is connected to a cylinder which has inside it a duct or tangential inlet which is where the steam passes through that was previously generated in the exchanger, on its way to the evaporator.
  • United States Patent 6793770 discloses an evaporator useful in the sugar industry which comprises at least a first heat exchanger and a second heat exchanger for top loading of a medium to be concentrated; means for heating each of said heat exchangers heat in cross stream by vapors having different compositions and different pressures; means for separately discharging said medium concentrated and exhaust vapors generated after escaping from said heat exchangers; a medium distributor common for all of said heat exchangers for feeding said medium to be concentrated; means for feeding the medium escaping from said first heat exchanger directly to the second heat exchanger; means for discharging the medium from the second heat exchanger thereby separating said medium from said exhaust vapors; a first common dividing wall for separating a space for said exhaust vapors from steam spaces of the heat exchangers; and a second dividing wall between said heat exchangers separating said steam spaces and/or turning chambers of the heat exchangers from each other.
  • It is another object of the present invention is to provide an evaporator system which does not employ external heat.
  • It is still another object of the present invention is to provide an evaporator system in which minimum spent wash is generated.
  • It is yet another object of the present invention is to provide an evaporator system which requires low water input.
  • It is a further object of the present invention is to provide an evaporator system which energy saving.
  • an evaporation system comprising a plurality of evaporators arranged in series, each evaporator comprising: • a shell side and a tube side; the shell side being connected to a source of hot vapors, the tube side being adapted to receive stillage;
  • said evaporation system adapted to utilize the hot vapors as the only source of heat.
  • the evaporator comprises distribution plates for facilitating thin film formation along the tube side.
  • the evaporation system of the present invention comprises at least three evaporators.
  • the evaporators and vapor separating vessels are arranged alternately.
  • the evaporation system of the present invention comprises at least three vapor separating vessels.
  • the evaporation system further comprises a condenser unit being connected to the vapor separating vessel of the terminal evaporator.
  • FIG. 1 illustrates evaporation system in accordance with the present invention DETAILED DESCRIPTION
  • an evaporation system in accordance with the present invention is adapted to utilize the hot vapors as the only source of heat.
  • an evaporation system 100 is depicted.
  • the system includes a plurality of serially arranged evaporators (4, 6, 8) having a shell side and a tube side.
  • the shell side of first evaporator (4) is connected to a source of hot vapors (2) and the tube side of the first evaporator (4) is provided with an inlet for receiving the stillage.
  • the stillage circulated through the tube side of the first evaporator (4) gets heat from the source of vapors connected to shell side.
  • a stillage left in the first evaporator (4) is transferred to the tube side of second evaporator (6) having a stillage inlet in communication with the stillage outlet of the first evaporator (4).
  • a steam outlet releases first evaporator steam as stillage boils in response to the heat from the hot vapor.
  • the released first evaporator steam is collected in first vapor separating vessel (10).
  • the stillage in the second evaporator (6) gets heated from the vapors obtained from first vapor separating vessel (10).
  • the stillage left in the second evaporator (6) is then transferred to the tube side of third evaporator (8) having a stillage inlet in communication with the stillage outlet of the second evaporator (6).
  • a steam outlet releases second evaporator steam as stillage boils in response to the heat from the hot vapor obtained from first vapor separating vessel (10).
  • the released second evaporator steam is collected in second vapor separating vessel (12).
  • the steam outlet of third evaporator releases third evaporator steam as stillage boils in response to the heat from the hot vapor obtained from second vapor separating vessel (12).
  • the released third evaporator steam is collected in third vapor separating vessel (14) which is then transferred to a condenser (16).
  • the evaporator in accordance with the present invention comprises distribution plates that facilitate the formation of thin film along the tube side of the evaporator when stillage falls through the tube side.
  • the thin film creation results in easy heat transfer and maximum evaporation rate.
  • the evaporator system of the present invention comprises at least three evaporators arranged in series.
  • the evaporators and vapor separating vessels are arranged alternately.
  • the evaporator system of the present invention comprises the at least three separating vessels arranged in series.
  • the amount of dissolved solids and vapor recovery in each evaporator is provided in the following table.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

La présente invention concerne un système d'évaporation qui comprend une pluralité d'évaporateurs montés en série, chaque évaporateur comportant : un côté enveloppe et un côté tube; le côté enveloppe étant connecté à une source de vapeurs chaudes, le côté tube étant conçu pour recevoir les résidus de distillerie; une sortie de vapeur connectée à un récipient de séparation de vapeur pour évacuer de la vapeur d'évaporateur à mesure que les résidus de distillerie bouillent en réponse à la chaleur issue de la vapeur chaude; et une sortie de résidus de distillerie pour évacuer lesdits résidus; ledit système d'évaporation étant conçu pour utiliser les vapeurs chaudes en tant qu'unique source de chaleur.
PCT/IN2011/000293 2010-04-29 2011-04-28 Système d'évaporation WO2011135589A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1200CH2010 2010-04-29
IN1200/CHE/2010 2010-04-29

Publications (2)

Publication Number Publication Date
WO2011135589A2 true WO2011135589A2 (fr) 2011-11-03
WO2011135589A3 WO2011135589A3 (fr) 2011-12-22

Family

ID=44861983

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2011/000293 WO2011135589A2 (fr) 2010-04-29 2011-04-28 Système d'évaporation

Country Status (2)

Country Link
BR (1) BRPI1101488A2 (fr)
WO (1) WO2011135589A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106492491A (zh) * 2016-10-25 2017-03-15 中原工学院 一种驱动热源潜热间接循环利用型多级蒸发浓缩装置
CN106568237A (zh) * 2016-10-25 2017-04-19 中原工学院 一种驱动热源全热间接循环利用型多级蒸发浓缩装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4077463A (en) * 1976-12-16 1978-03-07 Kaiser Aluminum & Chemical Corporation Caustic cooling system
US4132587A (en) * 1977-05-23 1979-01-02 Ecodyne Corporation Evaporator
EP0074509A2 (fr) * 1981-09-15 1983-03-23 Wiegand Karlsruhe GmbH Dispositif de concentration
JPS61107987A (ja) * 1984-10-30 1986-05-26 Mitsubishi Heavy Ind Ltd 多段フラツシユ蒸発装置の洗浄方法
US6793770B1 (en) * 1999-11-04 2004-09-21 Balcke-Durr Energietechnik Gmbh Evaporator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4077463A (en) * 1976-12-16 1978-03-07 Kaiser Aluminum & Chemical Corporation Caustic cooling system
US4132587A (en) * 1977-05-23 1979-01-02 Ecodyne Corporation Evaporator
EP0074509A2 (fr) * 1981-09-15 1983-03-23 Wiegand Karlsruhe GmbH Dispositif de concentration
JPS61107987A (ja) * 1984-10-30 1986-05-26 Mitsubishi Heavy Ind Ltd 多段フラツシユ蒸発装置の洗浄方法
US6793770B1 (en) * 1999-11-04 2004-09-21 Balcke-Durr Energietechnik Gmbh Evaporator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106492491A (zh) * 2016-10-25 2017-03-15 中原工学院 一种驱动热源潜热间接循环利用型多级蒸发浓缩装置
CN106568237A (zh) * 2016-10-25 2017-04-19 中原工学院 一种驱动热源全热间接循环利用型多级蒸发浓缩装置

Also Published As

Publication number Publication date
WO2011135589A3 (fr) 2011-12-22
BRPI1101488A2 (pt) 2012-10-16

Similar Documents

Publication Publication Date Title
US2759882A (en) Combined flash and vapor compression evaporator
JPH0215131A (ja) 処理液流間の熱伝導方法
CN105251233A (zh) 降膜及mvr强制循环蒸发结晶系统
JPH0723594B2 (ja) 多段蒸発システム
CN106693419A (zh) 竖管降膜蒸发器
US3251397A (en) Multiple effect evaporator of the single horizontal body, nested shell type
CN205216256U (zh) 降膜及mvr强制循环蒸发结晶系统
WO2011135589A2 (fr) Système d'évaporation
CN207324109U (zh) 一种降膜蒸发装置
CN112807721A (zh) 一种采用五效顺流蒸发流程提浓淡盐水的工艺方法
US4364794A (en) Liquid concentration apparatus
CN103272395A (zh) Mvr蒸发系统
WO2015025334A2 (fr) Évaporateur modulaire à pulvérisation
CN208626644U (zh) 一种降膜蒸发器
CN211752569U (zh) 一种多级串联横管降膜tvr蒸汽喷射蒸发器
RU2661121C2 (ru) Кожухотрубное устройство для рекуперации тепла из горячего технологического потока
CN210278297U (zh) 一种硝酸钠三效逆流蒸发结晶系统
CA1176153A (fr) Methode et dispositif de concentration de liquides
US2838108A (en) Multiple effect vacuum evaporator
CN214913426U (zh) 一种mvr节能蒸发釜
CN206642385U (zh) 多效降膜真空蒸发冷凝器设备
CN206642386U (zh) 一种具有高稳定性的多效降膜真空蒸发冷凝器设备
CN218944373U (zh) 一种混合效率高的浓缩釜
CN209771368U (zh) 一种高效新型降膜蒸发器
JPS62208266A (ja) 焼酎蒸溜廃液の減圧連続式濃縮処理装置

Legal Events

Date Code Title Description
NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11774545

Country of ref document: EP

Kind code of ref document: A2