WO2006106582A1 - 多段フラッシュ蒸発器 - Google Patents
多段フラッシュ蒸発器 Download PDFInfo
- Publication number
- WO2006106582A1 WO2006106582A1 PCT/JP2005/006341 JP2005006341W WO2006106582A1 WO 2006106582 A1 WO2006106582 A1 WO 2006106582A1 JP 2005006341 W JP2005006341 W JP 2005006341W WO 2006106582 A1 WO2006106582 A1 WO 2006106582A1
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- WO
- WIPO (PCT)
- Prior art keywords
- demister
- housing
- steam
- plates
- flash evaporator
- Prior art date
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Classifications
-
- 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)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
- B01D5/0009—Horizontal tubes
-
- 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 present invention relates to a multistage flash evaporator used for seawater desalination, for example.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-84302
- Patent Document 2 JP 2000-107501 A
- the conventional knitted wire mesh demister (20) shown in Fig. 8 is formed by knitting a thin wire mesh into a knot shape and overlapping it, and the opening between the wire meshes is small.
- the structure is such that when the scale begins to deposit around the wire mesh, the wire mesh closes for a while.
- the magnesium hydroxide in the seawater: Mg (OH) is mainly used in the high temperature stage of the evaporator. Scale as component
- the object of the present invention is to solve the above-mentioned problems of the prior art, use a vane type demister in a multi-stage flash evaporator, greatly increase the mist removal efficiency, and reduce the force to the demister.
- Multi-stage flash evaporation that can reduce the amount of distilled water produced by shutting down the equipment and reduce the cost of pickling of the demister. Is trying to provide a vessel.
- the invention of the multistage flash evaporator according to claim 1 includes a large number of nozzles maintained in a depressurized state, and a condenser tube bundle is provided at the top of each housing.
- a bowl-shaped condensate receptacle is provided below the condensing tube bundle, and a demister is provided at at least one of the front and rear sides of the condensing tube bundle in the housing, and a lower part of the housing evaporates.
- the heating brine is sequentially introduced into the evaporation chambers of each housing through the orifices to perform flash evaporation, in front of the condenser tube bundle in each housing.
- a demister provided at the steam inlet of at least one of the two rear sides is a steam collision plate having a corrugated cross section arranged in parallel at a predetermined interval. The water vapor generated in the lower part of the evaporation chamber of each housing passes through a zigzag gap between the corrugated vapor impingement plates across the cross section of the vane demister.
- Scale component force such as magnesium hydroxide in a minute amount of water droplets (mist) contained in water vapor Flow along the wall along with the water droplets adhering to the wall surface of the corrugated steam impingement plate The water vapor that has fallen and passed through the zigzag gap between the steam impingement plates of the vane type demister is brought into contact with the condensation tube bundle.
- Claim 2 is the invention of the multistage flash evaporator according to claim 1, wherein the steam inflow section on at least one of the front and rear sides of the condenser tube bundle in each housing is arranged in a substantially horizontal direction.
- a zigzag gap between the vapor collision plates of the demister is formed in a substantially vertical direction, and the water vapor generated in the lower part of the evaporation chamber of each housing is corrugated in the cross section of the vane type demister. It is characterized in that it passes through a zigzag gap between the plates upward from below.
- the invention of claim 3 is the multistage flash evaporator according to claim 1, wherein the vane type demister comprising the parallel cross-sectional corrugated steam impingement plates is provided on both the front and rear sides of the condenser tube bundle in each housing.
- a zigzag gap between the steam impingement plates of the demister is formed in a substantially horizontal direction at a steam inflow portion on at least one side of the demister.
- the water vapor generated in the lower part of the evaporation chamber of each housing passes through the zigzag gap between the corrugated vapor collision plates of the vane type demister in a substantially horizontal direction. .
- Claim 4 is the invention of the multi-stage flash evaporator according to claim 3, wherein water vapor generated in the lower part of the evaporation chamber of the housing is transferred to the upper part of the evaporation chamber of each housing.
- a plurality of rectifying plates are provided to guide a substantially horizontal zigzag gap between the steam impingement plates of the steam, and after the water vapor generated in the lower part of the evaporation chamber is guided by the plurality of rectifying plates, the vane type demister
- the cross-sectional corrugated steam impingement plates are configured to pass through a zigzag gap between the substantially horizontal plates in a substantially horizontal direction.
- the demister of the multistage flash evaporator is constituted by a vane type demister composed of vapor collision plates having a cross-sectional waveform arranged in parallel at predetermined intervals, and the evaporation chamber of each housing
- the water vapor generated in the lower part passes through the zigzag gap between the corrugated vapor collision plates of the vane type demister, and during the passage, the hydroxides in the trace water droplets (mist) contained in the water vapor Scale components such as magnesium flow down to the evaporation chamber side along with the water droplets adhering to the wall surface of the corrugated vapor impingement plate in the cross section, and the vane
- the water vapor that has passed through the zigzag gap between the vapor impingement plates of the demister is designed to come into contact with the condenser tube bundle.
- the vane demister is used in the multistage flash evaporator. This reduces the amount of deposition of scale on the demister, enables long-term continuous operation without stopping the equipment, and reduces the cost of production distilled water loss and pickling the demister by stopping the equipment. If you can do it, you will have an effect.
- a vane-type demister consisting of parallel cross-sectional corrugated steam impingement plates is disposed in a substantially horizontal direction at the steam inflow portion on at least one of the front and rear sides of the condensed tube bundle in each housing, so that the steam collision of the demister Since the zigzag gap between the plates is formed in a substantially vertical direction, the water vapor generated in the lower part of the evaporation chamber of each housing is zigzag-shaped between the corrugated vapor collision plates of the vane type demister.
- the passage of water vapor to the demister is extremely smooth, the amount of passage of the flash vapor is uniform, and the flow rate distribution of the vapor passing through the demister in the high-temperature and low-temperature evaporation stages. It will not cause any bias. As a result, the performance of the demister can be maintained uniformly, and the quality of the produced water can be maintained at a high level.
- the invention of claim 3 is the multistage flash evaporator according to claim 1, wherein the vane type demister composed of parallel cross-sectional corrugated vapor impingement plates is provided on both front and rear sides of the condenser tube bundle in each housing.
- the zigzag gap between the steam impingement plates of the demister is formed in a substantially horizontal direction at a steam inflow portion on at least one side of the housing, and is formed in the lower part of the evaporation chamber of each housing.
- the generated water vapor passes through the zigzag gap between the steam impingement plates of the vane type demister in a substantially horizontal direction.
- the water vapor passes through the demister. It is extremely smooth, reduces the deposition of scale on the demister, and enables long-term continuous operation without shutting down the equipment. If it is possible to reduce the cost! /, It exhibits the cormorant effect.
- Claim 4 is the invention of the multi-stage flash evaporator according to claim 3, wherein water vapor generated in the lower part of the evaporation chamber of the housing is transferred to the upper part of the evaporation chamber of each housing.
- a plurality of rectifying plates are provided to guide the substantially horizontal zigzag gap between the steam impingement plates of the steam, and the water vapor generated in the lower part of the evaporation chamber is guided by the plurality of rectifying plates.
- Cross section of the demister corrugated steam impingement plate between zigzag-shaped gaps between each other is made to pass in a substantially horizontal direction. According to the present invention, it is installed in front of the condensing part by the action of the rectifying plate.
- the drift of the mist accompanying steam flowing into the vane type demister can be suppressed, and mist removal efficiency as designed can be obtained.
- the rectifying plate plays the role of a mist scattering prevention plate, the mist load on the demister can be reduced.
- FIG. 1 is a partially cutaway perspective view showing a first embodiment of a multi-stage flash evaporator.
- FIG. 2 is an enlarged cross-sectional view of the multistage flash evaporator.
- FIG. 3 is an enlarged perspective view of a vane type demister portion.
- FIG. 4 is an enlarged cross-sectional view showing a second embodiment of the multistage flash evaporator.
- FIG. 5 is an enlarged cross-sectional view of the same, showing a modification of the current plate.
- FIG. 6 This enlarged cross-sectional view shows another variation of the current plate.
- FIG. 7 A multistage flash evaporator according to the present invention in which a vane type demister according to the present invention is applied to a first stage evaporator, a conventional knit knitted wire mesh demister, and a conventional expanded wire mesh demister, respectively.
- 6 is a graph showing the purity (electric conductivity) of produced distilled water in the first stage of the evaporator in a comparison experiment with a multistage flash evaporator applied to the first stage evaporator.
- FIG. 8 is an enlarged front view showing an example of a conventional knitted wire mesh demister.
- FIG. 9 is an enlarged front view showing an example of a conventional expanded wire mesh demister.
- Condensation tube bundle 6 bowl-shaped condensate receiver
- FIG. 1 is a partially cutaway perspective view of a multi-stage flash evaporator according to the present invention
- FIG. 2 is a schematic cross-sectional view of the multi-stage flash evaporator
- FIG. 3 is an outline of a vane type demister. It is a perspective view.
- front and rear, left and right are based on FIG. 2, front is the right side of FIG. 2, rear is the same left side, and left and right are frontward.
- the multistage flash evaporator of the present invention used for seawater desalination is provided with a number of housings (1) maintained in a decompressed state in parallel.
- a condensate tube bundle (5) is provided over the entire length in the longitudinal direction of the housing (1) at the top of each housing (1), and a bowl-shaped condensate receptacle (6) is provided under the condensate tube bundle (5) over the entire length.
- Demisters (7) are provided over the entire length on both the front and rear sides of the condenser tube bundle (5) in the housing (1).
- These demisters (7) and bowl-shaped condensate receptacles (6) are divided into housing (1) internal force upper evaporation chamber (2) and lower condensing part (3). .
- a pair of hanging plates (4) and (4) are arranged in the upper half of the central width of each housing (1) in the longitudinal direction of the housing (1) and at a predetermined interval from each other (5) ) Is placed in a state where the upper force enters the upper half.
- These hanging plates (4) and (4) are fixed to the ceiling (Id) of the housing (1) in a hanging shape at the center of the width of the housing (1) by means such as welding.
- the demisters (7) provided at the steam inflow portions on both the front and rear sides of the condenser tube bundle (5) in each housing (1) of the multistage flash evaporator are provided with a predetermined number. It is composed of a vane type demister consisting of a steam impingement plate (8) with a corrugated cross section that is arranged in parallel and spaced by bending a thin plate, and is formed at the bottom of the evaporation chamber (2) of each housing (1).
- the generated water vapor passes through the zigzag gap (9) between the corrugated vapor collision plates (8) of the vane type demister (7), and a minute amount of water droplets (mist) contained in the water vapor passes through the gap (9).
- the vane type demister (7) composed of the parallel cross-sectional corrugated steam collision plates (8) is provided on both the front and rear sides of the condensing tube bundle (5) in each housing (1).
- the steam impingement plate (8) (8) of the demister (7) is arranged in a substantially horizontal direction between the bowl-shaped condensate receptacle (6) and the inner wall of the housing (1) at the steam inlet.
- a zigzag gap (9) between them is formed in a substantially vertical direction. Water vapor generated in the lower part of the evaporation chamber (2) of each housing (1) passes through the zigzag gap (9) between the corrugated steam collision plates (8) (8) of the vane demister (7). It is designed to pass upward from below!
- the water vapor generated in the lower portion of the evaporation chamber (2) of each housing (1) is caused by the corrugated steam collision plates (8), (8) of the vane demister (7).
- Zigzag gap between (9) Therefore, the passage of water vapor to the demister (7) is extremely smooth and the amount of passage of the flash vapor is uniform, so that the vapor passing through the demister in the high-temperature evaporation stage and the low-temperature evaporation stage There will be no bias in the flow velocity distribution.
- the performance of the demister (7) can be maintained evenly as a whole, and the quality of the produced water can be maintained at a high level.
- each evaporation chamber (2) at the lower part of each housing (1) the orifice (10) is connected to the lower end of the rear side wall (la) of the louvering (1) and the housing (1).
- a dam (dam) with a horizontal wall (14) at the upper end on the downstream side of each orifice (10) to increase the exposed area. 13) is provided, and near the upper side of each weir (13), a brine jumping force prevention plate (15) is provided horizontally.
- the length of the housing (1) in the left-right direction maintained in a reduced pressure state is, for example, 20 or more meters, for example, 15 to 25 units of No, Uzing (1). It is provided in parallel in front and rear.
- the length of the evaporation chamber of each housing (1) is, for example, about 3.5 meters.
- multi-stage flash evaporators particularly the length and shape of the housing (1), the number of installed bases, etc., and the multi-stage flash evaporator according to the present invention is limited to the illustrated one. It is not something.
- the housing (1) rear wall (la) multiple orifices at the lower end (10) force evaporating chamber (2) rear force
- heated brine steam
- the brine flows over a dam (13) with a horizontal wall (14) at the top.
- it flashes and water vapor is generated.
- the brine further flows into the evaporation chamber (2) of the housing (1) following the numerous orifices (10) at the lower end of the front wall (lb) of the housing (1).
- the water vapor flashed and evaporated in the evaporation chamber (2) of the housing (1) passes through the demister (7) directly above to reach the condensing part (3), and passes through the demister (7).
- minute water droplets (mist) containing salt accompanying water vapor are removed.
- the vane-type demister (7) is used in the multistage flash evaporator to reduce the deposition (deposition) of the scale (7) on the demister, and the long-term operation without stopping the apparatus. Efficient continuous operation is possible, and the loss of production water volume due to the shutdown of the equipment and the cost of pickling the demister can be reduced.
- the vane type demisters (7) are provided over the entire length on both the front and rear sides of the condenser tube bundle (5) in the housing (1).
- These demisters (7) and bowl-shaped condensate receptacles (6) are divided into an evaporation chamber (2) in the upper part of 1S in the housing (1) and a condensing part (3) in the lower part of the housing (1).
- the force vane type demister (7) may be provided on at least one of the front and rear sides of the condenser tube bundle (5) in the housing (1).
- the vane demister (7) may be partially provided if it is not necessary to be provided over the entire length of the condensing tube bundle (5) in the housing (1).
- a partition plate or the like is appropriately installed between the partial vane demisters (7), and the upper evaporation chamber (2) and the lower condensation section ( It is necessary to prevent the water vapor flashed in the evaporation chamber (2) from coming into contact with the condenser tube (5) without passing through the demister (7).
- FIGS. 4 to 6 show a second embodiment of the multistage flash evaporator according to the present invention.
- FIG. 4 is a schematic cross-sectional view of the multistage flash evaporator according to the present invention
- FIG. 5 is an enlarged cross-sectional view of the same, and shows a modification of the current plate
- a vane demister (7) consisting of a corrugated steam impingement plate (8) in the shape of a cross-section is a bowl-shaped condensate receiver (5) at the steam inlets on both sides of the condensing tube bundle (5) in each housing (1).
- the zigzag gap (9) between the steam impingement plates (8) and (8) of the demister (7) is substantially horizontal.
- the water vapor generated in the lower part of the evaporation chamber (2) of each housing (1) is formed between the corrugated steam collision plates (8), (8) of the vane type demister (7). It passes through the zigzag gap (9) in a substantially horizontal direction.
- water vapor generated in the lower part of the evaporation chamber (2) of the housing (1) is transferred to the upper part of the evaporation chamber (2) of each housing (1).
- a large number of rectifying plates (11X12) are provided for guiding the steam impingement plates (8) and (8) to a substantially horizontal zigzag gap (9) between them.
- each evaporation chamber (2) on both the front and rear sides of the condenser tube bundle (5), between the front and rear side walls of the bowl-shaped condensate receptacle (6) and the inner surface of the side wall of the housing (1), respectively. 3 vertical straightening plates
- (11) are arranged in parallel at predetermined intervals.
- the first vertical rectifying plates (l la) (l la) close to the front and rear side walls of the bowl-shaped condensate receiver (6) are the lowest bowl-shaped condensate receiver (6 ) Is positioned so as to correspond to the middle part of the height of both side walls.
- the second vertical rectifying plate (l lbXl lb) has a height approximately 1.5 times the height of the first vertical rectifying plate (l laXl la), and its upper end is the first vertical rectifying plate. It is at the same level as the upper end of the rectifying plate (l laXl la), and extends downward from the lower end of the first vertical rectifying plate (l laXl la).
- the third vertical rectifying plate (l lcXl lc) near the front and rear side walls of the housing (1) is the height of the first vertical rectifying plate (l laXl la) that is the highest.
- the upper end of the first vertical rectifier plate (l laXl la) is at the same level as the upper end of the first vertical rectifier plate (l laXl la) and extends further downward than the lower end of the second vertical rectifier plate (l lb) (l lb).
- the lower end of the evaporating chamber (2) is close to the heating brine (seawater).
- each evaporation chamber (2) the vane type demister (7) and the housing (1) are provided on both the front and rear sides of the vane type demister (7) arranged in a substantially vertical direction.
- Three curved rectifying plates (12) are arranged in parallel with each other at a predetermined interval between the inner surface of the side walls.
- the first curved rectifying plates (12 a ) and (12a) corresponding to the vicinity of the lower end of the vane demister (7) are: It is composed of an arcuate part with the narrowest width and a central angle of approximately 90 °.
- the upper end of the first curved rectifying plate (12 a) (12a), the lower end of the demister backward or forward force near the lower end of (7) also'll disposed so useless, and the first curved rectifying plate (12 a) (12a) Are placed in the middle of the 1st vertical rectifier plate (1 la) and the 2nd vertical rectifier plate (1 lb) from above, and are slightly closer to the 2nd vertical rectifier plate (1 lb). It is distributed.
- the second curved straightening vane following it is positioned so as to correspond to the middle portion of the height of the vane demister (7) of (12b) (12b), the first curved rectifying plate (12 a) (12a) It is composed of an arcuate portion having a width approximately twice the width and corresponding to a central angle of approximately 90 °, and a horizontal portion extending horizontally to the demister (7) side.
- the upper end of the second curved rectifying plate (12b) (12b) (the tip of the horizontal portion) is arranged at the middle of the height of the demister (7) so as to see the rear or forward force. (12 a) is also separated demister (7) forces the upper end of (12a).
- the lower ends of the second curved rectifying plates (12b) and (12b) are respectively viewed from above and slightly between the second vertical rectifying plate (1 lb) and the third vertical rectifying plate (1 lc). Arranged to be closer to the 3rd vertical baffle (1 lc)! RU
- Housing third bending straightening plate close to the front and rear side walls of the (1) (12 C) ( 12c) is approximately three times the width of the most wide wide instrument first curved rectifying plate (12 a) (12a) And has a circular arc portion corresponding to a central angle of approximately 90 ° and a wide horizontal portion extending horizontally to the demister (7) side.
- the upper end of the third curved rectifying plate (12 C ) (12c) (the tip of the horizontal portion) is arranged to look into the upper end of the demister (7) from the rear or the front, but the second curved rectifying plate ( The demister (7) force is further away from the upper end of 12b and 12b.
- the lower ends of the third curved rectifying plates (12 C ) and (12c) are slightly pushed into the middle between the third vertical rectifying plate (1 lc) and the front and rear side walls of the housing (1).
- the housing (1) is arranged so as to be located near both front and rear side walls.
- the water vapor generated in the lower part of the evaporation chamber (2) is divided into three vertical rectifying plates (1 la) (l lb) (l lc) and then three curved rectifying plates (12 a ) (12b ) (12 C ), and then passes through the zigzag gap (9) between the corrugated steam collision plates (8) and (8) of the vane demister (7) in a substantially horizontal direction. It is made like that.
- the vane type demister (7) installed in front of the condenser (3) by the action of these rectifying plates (ll a ) (l lb) (ll C ) (12 a ) (12b) (12 C ) It is possible to suppress the drift of the mist accompanying steam flowing into the) and to obtain the mist removal efficiency as designed. In addition, it is possible to take drift countermeasures without significantly changing the structure of the multistage flash evaporator. Rectifying plate
- the steam passing through the vane demister (7) generally has a higher flow rate of the steam passing through the lower part of the demister (7).
- the first vertical straightening plate (l laXl la) near the front and rear side walls of the bowl-shaped condensate receptacle (6) is the second lowest vertical straightening plate (l lbXl lb)
- the third vertical rectifier plate (l lcXl lc) has a height approximately 1.5 times the height of the first vertical rectifier plate (l laXl la) and is close to the front and rear side walls of the housing (1).
- the height of the first vertical rectifier plate (l laXl la) is approximately twice the height of the first straight rectifier plate, and the first curved rectifier corresponding to the lower end of the vane demister (7) plate (12 a) (12a), the second curved straightening vane most width is Semagu following (12b) (12b) is approximately twice the width of the first curved rectifying plate (12 a) (12a) It has a third curved straightening vane close to the front and rear side walls of the housing (1) (12 C) ( 12c) , Have been made to have a substantially three times the width of the most wide wide instrument first curved rectifying plate (12 a) (12a), first to third vertical rectifying plates (l laXl lbXl lc) and the 1st to 3rd curved rectifier
- the passage of water vapor to the demister (7) is extremely smooth, and the deposition and deposition of scale on the demister (7) is prevented. This makes it possible to continue long-term operation without shutting down the equipment, thereby reducing the loss of distilled water produced by shutting down the equipment and the cost of pickling the demister.
- FIG. 5 shows a first modification of the rectifying plate in the second embodiment of the multistage flash evaporator according to the present invention.
- the difference from the case of the second embodiment is that the steam generated in the lower part of the evaporation chamber (2) of the housing (1) is converted into the steam impingement plate (8) (8) of the vane demister (7).
- the rectifying plate for guiding to the substantially horizontal zigzag gap (9) between them is composed of three curved rectifying plates (12a) (12b) (12c), and the vertical rectifying plate (1 la) Installation of (l lb) (l lc) is omitted It is in the point.
- the shapes and arrangement positions of the three curved rectifying plates (12 a ), (12b), and (12 C ) are the same as those in FIG. That is, the first curved straightening vane that corresponds to the neighborhood of the lower end portion of the vane demister (7) (12 a) ( 12a) is formed of a circular arc portion which corresponds to the most narrow width and central angle approximately 90 ° Yes.
- the upper end of the first curved rectifying plate (12 a) (12a), the rear or disposed to desire also forward force near the lower end of the demister (7), and first curved rectifying plate (12 a) (12a)
- the lower end of the evaporating chamber (2) is arranged so that it can be directed to the brine below and viewed from above.
- the second curved straightening vane following it is positioned so as to correspond to the middle portion of the height of the vane demister (7) of (12b) (12b), the first curved rectifying plate (12 a) (12a) It is composed of an arcuate portion having a width approximately twice the width and corresponding to a central angle of approximately 90 °, and a horizontal portion extending horizontally to the demister (7) side.
- the upper ends of the second curved rectifying plates (12b) and (12b) (the tip of the horizontal portion) are arranged so as to be squeezed rearward or forward in the middle of the height of the demister (7).
- the demister (7) force is also separated from the upper end of 12a) and 12a.
- the lower ends of the second curved rectifying plates (12b) and (12b) are arranged so that the upper force can be applied to the brine below the evaporation chamber (2).
- Housing third bending straightening plate close to the front and rear side walls of the (1) (12 C) ( 12c) is approximately three times the width of the most wide wide instrument first curved rectifying plate (12 a) (12a) And has a circular arc portion corresponding to a central angle of approximately 90 ° and a wide horizontal portion extending horizontally to the demister (7) side.
- the upper end of the third curved rectifying plate (12 C ) (12c) (the tip of the horizontal portion) is arranged to look into the upper end of the demister (7) from the rear or the front, but the second curved rectifying plate ( The demister (7) force is further away from the upper end of 12b and 12b.
- the lower end of the third curved rectifying plate (12 C ) (12c) is pushed into the brine in the lower part of the evaporation chamber (2) from the top, and is slightly closer to the front and rear side walls of the housing (1). It is dealt with.
- the water vapor generated in the lower part of the evaporation chamber (2) is rectified by three curves. after being guided by a plate (12 a) (12b) ( 12 C), schematic cross-sectional waveform steam impingement plate of the vane-type demister (7) (8) (8) zigzag gap between each other (9) It is designed to pass horizontally.
- the curved rectifying plates (12 a ), (12b), and (12 C ) are installed in front of the condensing unit (3) by the action of these curved rectifying plates (12 a ), (12b), and (12 C ).
- Mist entrained steam flowing into the vane demister (7) can be prevented from drifting, and mist removal efficiency can be achieved as designed.
- it curved straightening vane to force (12 a) (12b) (12 C) is to serve the mist scattering prevention plate, it is possible to reduce the mist load on the demister (7).
- FIG. 6 shows a second modification of the rectifying plate in the second embodiment of the multistage flash evaporator according to the present invention, which is similar to the case of the first modification of the rectifying plate shown in FIG.
- (12 a) (12b ) (12 C) is constituted by, vertical rectifying plates (1 la) (l lb) mounting of (l lc) Injuries are omitted.
- the case is different from the first modification in the shape of three curved rectifying plate (12 a) (12b) ( 12 C). That is, the first curved straightening vane that corresponds to the neighborhood of the lower end portion of the vane demister (7) (12 a) ( 12a) is constituted by a bent portion formed at an end portion of the horizontal portion and the housing side wall .
- first curved rectifying plate (12 a) (12a) (the tip of the horizontal portion) is disposed so as to face rearward or forward force near the lower end of the demister (7), and first curved straightening vane (12 a ) (12a) is arranged so that the lower end of the evaporating chamber (2) can be seen from above by force toward the lower brine.
- the second curved straightening vane following it is positioned so as to correspond to the middle portion of the height of the vane demister (7) of (12b) (12b), the first curved rectifying plate (12 a) (12a) It has a width approximately twice the width, and is composed of a horizontal portion and a bent portion formed at the end on the side wall side.
- the upper ends of the second curved rectifier plates (12b) and (12b) (the tip of the horizontal portion) are arranged at the middle of the height of the demister (7) so that they can be seen from the rear or the front.
- demister (7) forces the upper end of the plate (12 a) (12a) are also separated.
- the lower ends of the second curved rectifying plates (12b) and (12b) are arranged so as to be seen from above toward the brine below the evaporation chamber (2).
- the housing (1) third bending straightening plate close to the front and rear side walls of the (12 C) (12c) is the most wide wide instrument first curved rectifying plate (12a) a width substantially three times of (12a) Having a width and on the horizontal part and the side wall of the housing It is comprised by the bending part formed in the edge part.
- the upper ends of the third curved rectifying plates (12 C ) and (12c) (the front end of the horizontal portion) are arranged at the upper end of the demister (7) so as to look backward or forward.
- the demister (7) force is further away from the upper end of (12b) and (12b).
- the lower end of the third curved rectifying plate (12 C ) (12c) is made to force upward against the brine in the lower part of the evaporation chamber (2) and to be slightly closer to the front and rear side walls of the housing (1). It is distributed.
- the mounting has been omitted for three vertical rectifying plates (llaXllbXllc), and three curved rectifying plate (12 a) (12b) ( 12 C)
- the shape is different from the case of the first modification, the water vapor generated in the lower part of the evaporation chamber (2)
- vane-type demister (7) vane-type mist eliminator shown in Figs. 1 to 3 is applied to the first-stage evaporator, and the wire mesh demister shown in Figs. 8 and 9 is used.
- (20X21) Wired mesh type Mister Eliminator 1 and 2 was applied to the first stage evaporator, respectively, and the purity of the distilled water produced in the first stage of the evaporator (electric conductivity) was measured. The results obtained are shown in the graph of FIG.
- the length of the housing (1) in the left-right direction maintained at a reduced pressure is 20 meters, for example, and 15 units of the housing (1) are provided in parallel in the front and rear.
- the evaporation chamber length of each housing (1) was 3.5 meters.
- the multistage flash evaporator of the present invention in which the vane type demister (7) (vane type mister eliminator) is applied to the first stage evaporator produces even after one year. It can be seen that the purity of the distilled water (electrical conductivity) did not deteriorate and the deposition of scale on the demister (7) was prevented.
- conventional multi-stage flash evaporators in which wire mesh demister (20X21) (wire mesh type mist eliminators 1 and 2) are applied to the first-stage evaporator, respectively, cause scale deposition and deposition within half a year. As a result, the wire mesh demister (20X21) was closed, and the purity of the produced distilled water (electrical conductivity) deteriorated.
- the present invention relates to a multistage flash evaporator of a seawater desalination apparatus using a multistage flash evaporation method, and contributes to the supply of inexpensive water resources.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2005/006341 WO2006106582A1 (ja) | 2005-03-31 | 2005-03-31 | 多段フラッシュ蒸発器 |
JP2007512386A JP4972547B2 (ja) | 2005-03-31 | 2005-03-31 | 多段フラッシュ蒸発器 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2005/006341 WO2006106582A1 (ja) | 2005-03-31 | 2005-03-31 | 多段フラッシュ蒸発器 |
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WO2006106582A1 true WO2006106582A1 (ja) | 2006-10-12 |
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PCT/JP2005/006341 WO2006106582A1 (ja) | 2005-03-31 | 2005-03-31 | 多段フラッシュ蒸発器 |
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JP (1) | JP4972547B2 (ja) |
WO (1) | WO2006106582A1 (ja) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007026548A1 (de) | 2007-06-08 | 2008-12-18 | Bayer Materialscience Ag | Vermeidung von Feststoffablagerungen in Tropfenabscheidern durch Eindüsung von geeigneten Flüssigkeiten |
JP2009034608A (ja) * | 2007-08-02 | 2009-02-19 | Hitachi Zosen Corp | 凝縮装置 |
US7678227B2 (en) | 2005-10-14 | 2010-03-16 | Friedrich Alt | Multi-stage flash evaporator |
KR101236861B1 (ko) | 2008-01-18 | 2013-02-26 | 고도가이샤 야베가꾸쥬쯔신꼬까이 | 에너지 절약형 담수 제조장치 |
JP2014018736A (ja) * | 2012-07-18 | 2014-02-03 | Miura Co Ltd | 造水装置 |
CN107854858A (zh) * | 2017-10-27 | 2018-03-30 | 中石化宁波工程有限公司 | 多级闪蒸罐 |
CN107952259A (zh) * | 2017-12-29 | 2018-04-24 | 上海协升化工科技有限公司 | 一种高效叶片式进料分布装置 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102189530B1 (ko) * | 2013-12-31 | 2020-12-11 | 두산중공업 주식회사 | 분산형 증기경로가 구비된 med |
KR101768009B1 (ko) | 2016-08-18 | 2017-08-14 | 박성종 | 여과플레이트를 이용한 미세먼지 제거장치 |
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JP3418911B2 (ja) * | 1998-09-08 | 2003-06-23 | 日立造船株式会社 | 多段フラッシュ蒸発器 |
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- 2005-03-31 JP JP2007512386A patent/JP4972547B2/ja not_active Expired - Fee Related
- 2005-03-31 WO PCT/JP2005/006341 patent/WO2006106582A1/ja not_active Application Discontinuation
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JPS509579A (ja) * | 1973-05-30 | 1975-01-31 | ||
JPS59190390U (ja) * | 1983-06-03 | 1984-12-17 | 三菱重工業株式会社 | 蒸発装置用デミスタ |
JPS6067189U (ja) * | 1983-10-14 | 1985-05-13 | 三菱重工業株式会社 | フラツシユ蒸発型造水装置 |
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JP2000082302A (ja) * | 1998-09-04 | 2000-03-21 | Hinode Kizai Kk | 蓄光構造体 |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7678227B2 (en) | 2005-10-14 | 2010-03-16 | Friedrich Alt | Multi-stage flash evaporator |
DE102007026548A1 (de) | 2007-06-08 | 2008-12-18 | Bayer Materialscience Ag | Vermeidung von Feststoffablagerungen in Tropfenabscheidern durch Eindüsung von geeigneten Flüssigkeiten |
EP2014638A2 (de) | 2007-06-08 | 2009-01-14 | Bayer MaterialScience AG | Vermeidung von Feststoffablagerungen in Tropfenabscheidern durch Eindüsung von geeigneten Flüssigkeiten |
JP2009034608A (ja) * | 2007-08-02 | 2009-02-19 | Hitachi Zosen Corp | 凝縮装置 |
KR101236861B1 (ko) | 2008-01-18 | 2013-02-26 | 고도가이샤 야베가꾸쥬쯔신꼬까이 | 에너지 절약형 담수 제조장치 |
JP2014018736A (ja) * | 2012-07-18 | 2014-02-03 | Miura Co Ltd | 造水装置 |
CN107854858A (zh) * | 2017-10-27 | 2018-03-30 | 中石化宁波工程有限公司 | 多级闪蒸罐 |
CN107952259A (zh) * | 2017-12-29 | 2018-04-24 | 上海协升化工科技有限公司 | 一种高效叶片式进料分布装置 |
Also Published As
Publication number | Publication date |
---|---|
JP4972547B2 (ja) | 2012-07-11 |
JPWO2006106582A1 (ja) | 2008-09-11 |
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