WO1995005227A1 - Evaporateur a flux descendant pourvu d'un systeme de nettoyage automatique - Google Patents

Evaporateur a flux descendant pourvu d'un systeme de nettoyage automatique Download PDF

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Publication number
WO1995005227A1
WO1995005227A1 PCT/DE1994/000938 DE9400938W WO9505227A1 WO 1995005227 A1 WO1995005227 A1 WO 1995005227A1 DE 9400938 W DE9400938 W DE 9400938W WO 9505227 A1 WO9505227 A1 WO 9505227A1
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WO
WIPO (PCT)
Prior art keywords
falling film
brushes
film evaporator
cleaning
heat exchanger
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.)
Ceased
Application number
PCT/DE1994/000938
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German (de)
English (en)
Inventor
Yuyao Qin
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1995005227A1 publication Critical patent/WO1995005227A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
    • F28G1/163—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from internal surfaces of heat exchange conduits
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/057—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices being entrained discrete elements, e.g. balls, grinding elements, brushes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/02—Non-rotary, e.g. reciprocated, appliances having brushes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination

Definitions

  • the invention which mainly consists of three different assemblies (product distribution system, heat exchanger and automatic cleaning system), has two exemplary embodiments, which are described below.
  • the first embodiment is shown in Fig.la and Fig.lb.
  • the product distribution system is designed as a flat, rectangular container with both ends closed.
  • flat jet nozzles (7 in Fig. La) are arranged in rows, the number of which is equal to the number of evaporator chambers (10 in Fig.la).
  • the center lines of the rows are in the planes of symmetry of the associated evaporator chambers.
  • the nozzles in a row are at a distance of 35-45 mm and alternately spray in the vertical direction on two sides of the evaporator chamber with an inclination angle of approximately 20 °.
  • the shape of the spray generated with the flat jet nozzle is flat and fan-shaped with a mist cone angle of approximately 110 °.
  • the amount sprayed depends on the type of nozzle, the pressure in the product distribution system and the physical properties of the product.
  • the mass distribution of the spray mist of a nozzle transversely to the main spray cone axis corresponds approximately to a normal distribution.
  • the angle of inclination of the nozzles (approx. 20 °), the spray cone angle (110 °), the distance between two neighboring nozzles and the distance between the nozzles and the evaporator chamber surfaces are matched to one another in such a way that at least a 20 percent overlap of the spray fog is guaranteed by two neighboring nozzles working in the same direction. This leads to an even distribution of the liquid on the walls of the evaporator chambers.
  • the distribution system has the advantage that the falling film produced thereby has a high initial speed.
  • the heat exchanger with a rectangular outer shape consists of a series of narrow, rectangular chambers and has a surface with ribbed plates on the steam side. At the upper end of the heat exchanger, where the spray mist hits the heat exchanger surfaces, the distribution of the liquid is very uneven, so that there is an increased risk of fouling here. In order to prevent fouling processes as much as possible, an approximately 0.1m high cooling zone (8 in Fig.la) is arranged in this area, which makes it possible to cool this part of the heat exchanger.
  • the automatic cleaning system consists of cleaning brushes (16 in Fig. Lb), brush heads (18 in Fig. Lb), distribution brushes (19 in Fig.
  • Each drive rod is sealed against the bottom of the heat exchanger with a rubber seal.
  • Each evaporation chamber is assigned a brush which is adapted to the width and length of the chamber and which is mounted on a brush head.
  • the brush heads are supported by two drive rods mounted on the two distributor pipes. All brush heads, drive rods and distributor pipes are hollow. Holes with a diameter of approx. 3 mm are made on the long sides of the brush heads (17 in Fig.lb).
  • the distance between two neighboring holes is approx.15mm.
  • the liquid product pumped in during the cleaning phase can escape through the product inlet, distribution pipes, drive rods, brush heads and through the small holes. All brushes, brush heads, drive rods and the two distribution pipes form a rigid body that moves up and down during operation in freely selectable time intervals by means of a motor, gear mechanism and spindle drive becomes.
  • a cleaning cycle takes about 30 seconds. The brushes then remain in their resting position on the bottom of the evaporator until the next cleaning cycle (SS in Fig. La).
  • SS in Fig. La the next cleaning cycle
  • the following measures are taken: a)
  • the cleaning brushes are designed so that triangular between the bristles
  • liquid film produced by the nozzle distribution system has a falling speed higher than the speed of the downward moving brushes, no dry surfaces are created when the brushes move downward.
  • the second embodiment is shown in Fig.2 and Fig.3.
  • the product distribution system consists of a distribution plate (8 in Fig.2) and distribution pipes (9 in Fig.2).
  • the rooms separated by the distribution plate are connected to each other by two pipes (7 in Fig.2).
  • the walls of the evaporator chamber protrude into the lower room.
  • V-shaped recesses are arranged on the upper edge of the walls of the evaporator chamber (see detail Y in Fig. 3).
  • the liquid product flows through the distribution plate through the distribution pipes to the upper end of the heat exchanger. It is evenly distributed through the V-shaped recesses at the upper end of the evaporator chamber and flows down in a thin film under the influence of gravity.
  • the heat exchanger has a rectangular outer shape.
  • Its evaporator chamber consists of a series of narrow, rectangular and vertical chamber elements, which are connected in the middle by a narrow, orthogonal chamber (see section I - L in Fig.2).
  • the evaporator chamber is delimited by corrugated plates on both sides and ribbed on the steam side by needles or drilled plates, so that on the one hand the stability of the evaporator chamber walls is increased and on the other hand the heat transfer coefficient is improved. It is possible to manufacture the main part of the heat exchanger by soldering in a salt bath.
  • the automatic cleaning system consists of cleaning brushes (11 in Fig.2), a brush head (12 in Fig.2), distribution brushes (13 in Fig.2), two drive rods (6 in Fig.2), a crossbar (4 in Fig. 2), a spindle drive (3 in Fig.2) and gear transmission system (1 in Fig.2) with motor and control system (2 in Fig.2).
  • the two drive rods are sealed against the evaporator cover with a rubber seal.
  • the brush head which is supported by the two drive rods mounted on the crossbar, has the same shape as the evaporator chamber (see Fig. 4).
  • Two cleaning brushes (see Fig. 5) and distribution brushes, which are mounted on the top and bottom of the brush head, are assigned to each evaporator chamber element.
  • All brushes, the brush head, the crossbar and the two drive rods form a rigid body, which is moved occasionally by the motor, gear mechanism and spindle drive during operation at freely selectable time intervals in order to clean all heat exchanger surfaces twice.
  • the cleaning brushes move between positions SS and EE in Fig.2.
  • a cleaning cycle takes about 30 seconds.
  • the brushes then remain in their rest position until the next cleaning cycle, which is located in the evaporator cover between the distribution pipes (position SS in Fig. 2).
  • On two opposite walls of the evaporator cover and the evaporator bottom are the guide grooves (5 and 15 in Fig. 2), which are adapted in size, number and position to the evaporator chamber elements, and which ensure the problem-free movement of the cleaning brushes as they enter and exit the evaporator chamber , arranged.
  • the cleaning plates (10 in Fig. 2) are welded to the distribution pipes. Two cleaning plates are assigned to each cleaning brush. The length of the plate and the distance between these two plates adapt to the brush geometry. About 2mm long, conical spikes are arranged on the convex working surfaces of the cleaning plates (see detail Y in Fig.3). As a result, the cleaning brushes move as the cleaning system moves up and down partly mechanically dehumidified and cleaned.
  • the speed of the cleaning system during the downward movement is greater than the flow speed of the product film, dry surfaces are created. For this reason, the speed of the cleaning brushes moving downwards is set low at approx.0.5m high upper area of the evaporation chamber in order to minimize or avoid the formation of dry surfaces.
  • the evaporator chamber is separated into two rooms by the cleaning brushes, which are connected to one another by bores (14 in Fig. 2) in order to minimize pressure differences that occur.
  • all of the heat exchanger surfaces can be cleaned online by the clocked movement of the automatic cleaning system without interrupting the production process, and the fouling resistances can thus be kept to almost zero.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cleaning In General (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Les salissures persistantes qui apparaissent au niveau des surfaces d'échange de chaleur des évaporateurs à flux descendant connus génèrent des frais importants. Ce nouvel évaporateur à flux descendant vise à empêcher l'émergence de ces salissures persistantes pendant le processus de production ou de les réduire approximativement à zéro. Les surfaces d'échange de chaleur de l'évaporateur à flux descendant, qui sont cannelées finement côté vapeur, peuvent être nettoyées en continu pendant le processus de production par un système de nettoyage automatique qui se compose essentiellement d'une tête de brosse adaptée à la dimension de la chambre d'évaporation et de brosses de nettoyage et de distribution montées dessus, à l'aide d'un système d'entraînement qui abaisse et relève les brosses à des intervalles de temps pouvant être choisis. Cet évaporateur à flux descendant s'utilise dans des processus d'évaporation et de concentration de produits liquides dans l'industrie chimique et alimentaire, par exemple pour le dessalement de l'eau de mer.
PCT/DE1994/000938 1993-08-19 1994-08-17 Evaporateur a flux descendant pourvu d'un systeme de nettoyage automatique Ceased WO1995005227A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4327839.6 1993-08-19
DE4327839A DE4327839A1 (de) 1993-08-19 1993-08-19 Düsen-Fallfilmverdampfer mit automatischem Reinigungssystem

Publications (1)

Publication Number Publication Date
WO1995005227A1 true WO1995005227A1 (fr) 1995-02-23

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PCT/DE1994/000938 Ceased WO1995005227A1 (fr) 1993-08-19 1994-08-17 Evaporateur a flux descendant pourvu d'un systeme de nettoyage automatique

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DE (1) DE4327839A1 (fr)
WO (1) WO1995005227A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012005542U1 (de) 2012-06-07 2012-06-26 Johannes Rainer Vorrichtung zum Reinigen der Außenflächen von Wärmetauschern
US9568253B2 (en) 2011-04-18 2017-02-14 Empire Technology Development Llc Dissipation utilizing flow of refrigerant
US10010811B2 (en) 2013-05-28 2018-07-03 Empire Technology Development Llc Evaporation-condensation systems and methods for their manufacture and use
US10065130B2 (en) 2013-05-28 2018-09-04 Empire Technology Development Llc Thin film systems and methods for using same
CN117205586A (zh) * 2023-09-20 2023-12-12 俞天翔 一种钢丝螺旋自动清洗式降膜蒸发器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2775767B1 (fr) * 1998-03-06 2000-06-02 Packinox Sa Dispositif de nettoyage d'un canal de circulation d'un fluide d'echange thermique dans un echangeur de chaleur a plaques
DE20307446U1 (de) 2003-05-13 2003-07-10 LOFT Anlagenbau und Beratung GmbH, 72138 Kirchentellinsfurt Vorrichtung zur Aufbereitung von Abwasser, insbesondere von Industrieabwasser
CN100455972C (zh) * 2007-01-17 2009-01-28 哈尔滨工业大学 污水及地表水冷热源筒簇在线防污换热装置及方法
DE102008040006A1 (de) * 2008-08-27 2010-03-04 Qvf Engineering Gmbh Verdampfervorrichung und Batch-Destillationsverfahren
CN114669066B (zh) * 2022-03-24 2023-09-26 四川点石能源股份有限公司 一种mvr蒸发浓缩系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE935339C (de) * 1953-11-17 1955-11-17 Walter Hartwig Vorrichtung zum Reinigen der Rohr-Innenwandungen von vertikal stehenden Rohrsystemen
DE1619697A1 (de) * 1967-05-31 1971-07-08 Bayer Ag Fallfilmverdampfer
DE2948387A1 (de) * 1979-12-01 1981-06-04 Crombeen, Alfonsus Franciscus, 6000 Frankfurt Verfahren zur reinigung von waermetauschern und fuer die anwendung des verfahrens geeigneter waermetauscher
DE3644629A1 (de) * 1986-12-29 1988-07-07 Reininger Gmbh Senkrechter vorlaufwaermeverteiler mit waermerueckgewinnung und schadstoffminderung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332469A (en) * 1966-09-13 1967-07-25 Rosenblad Corp Falling film type heat exchanger

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE935339C (de) * 1953-11-17 1955-11-17 Walter Hartwig Vorrichtung zum Reinigen der Rohr-Innenwandungen von vertikal stehenden Rohrsystemen
DE1619697A1 (de) * 1967-05-31 1971-07-08 Bayer Ag Fallfilmverdampfer
DE2948387A1 (de) * 1979-12-01 1981-06-04 Crombeen, Alfonsus Franciscus, 6000 Frankfurt Verfahren zur reinigung von waermetauschern und fuer die anwendung des verfahrens geeigneter waermetauscher
DE3644629A1 (de) * 1986-12-29 1988-07-07 Reininger Gmbh Senkrechter vorlaufwaermeverteiler mit waermerueckgewinnung und schadstoffminderung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9568253B2 (en) 2011-04-18 2017-02-14 Empire Technology Development Llc Dissipation utilizing flow of refrigerant
DE202012005542U1 (de) 2012-06-07 2012-06-26 Johannes Rainer Vorrichtung zum Reinigen der Außenflächen von Wärmetauschern
US10010811B2 (en) 2013-05-28 2018-07-03 Empire Technology Development Llc Evaporation-condensation systems and methods for their manufacture and use
US10065130B2 (en) 2013-05-28 2018-09-04 Empire Technology Development Llc Thin film systems and methods for using same
CN117205586A (zh) * 2023-09-20 2023-12-12 俞天翔 一种钢丝螺旋自动清洗式降膜蒸发器

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Publication number Publication date
DE4327839A1 (de) 1994-07-28

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