CN107126720B - Environment-friendly evaporator and double-effect evaporation system using same - Google Patents
Environment-friendly evaporator and double-effect evaporation system using same Download PDFInfo
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- CN107126720B CN107126720B CN201710445905.3A CN201710445905A CN107126720B CN 107126720 B CN107126720 B CN 107126720B CN 201710445905 A CN201710445905 A CN 201710445905A CN 107126720 B CN107126720 B CN 107126720B
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- evaporator
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- water distribution
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- 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
- 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
- B01D1/30—Accessories for evaporators ; Constructional details thereof
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- 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
Abstract
The invention discloses an evaporator and a double-effect evaporation system using the same, which comprises a shell, an upper end cover, a lower end cover, an upper porous water distribution plate and a lower porous water distribution plate, wherein heat exchange tube groups are fixedly arranged between the upper porous water distribution plate and the lower porous water distribution plate at intervals, each heat exchange tube group comprises an inner tube and an outer tube, the inner wall of the outer tube, the outer wall of the inner tube and the inner wall can be used for evaporating and concentrating waste liquid, the inner wall of the outer tube or the outer wall of the inner tube can be provided with bulges, the area for evaporating and concentrating the waste liquid is greatly increased in the same-volume evaporator, the production efficiency is greatly improved, the concentration and evaporation effects are good, in addition, the upper porous water distribution plate adopts a high-strength corrosion-resistant stainless steel galvanized plate, after being heated, the cracking resistance is strong, and the service life of the evaporator is prolonged, so that the waste liquid evaporation and concentration effect of the double-effect evaporation system using the evaporator is strong, and the service life is long.
Description
Technical Field
The invention belongs to the technical field of evaporation and concentration, and particularly relates to a falling film evaporator for evaporation and concentration treatment of salt-containing waste liquid and a double-effect evaporation system using the falling film evaporator.
Background
The film evaporator (Thin film evaporator) is one kind of evaporator and features that the liquid material flows in film form along the wall of the heating pipe to transfer heat and evaporate, and has the advantages of high heat transfer efficiency, fast evaporating speed and short material residence time, so that it is especially suitable for evaporating heat sensitive matter. The thin film evaporator unit consists of three parts of an evaporator, a vapor-liquid separator and a preheater and a simple separator, and the evaporator has the characteristics of high production capacity, high efficiency, short material heating time and the like, and is suitable for concentrating dilute solution in the industries of pharmacy, food, chemical industry and the like. According to the reasons of film formation and different flow directions, the film formation device can be divided into three types of film lifting evaporators, falling film evaporators and film scraping evaporators.
The falling film evaporator is mostly a falling film type tubular heat exchanger, and has the characteristics of large production capacity, high efficiency, short material heating time and the like, but the production capacity and the efficiency of the existing equipment are also improved, and the contact part of the equipment and the material is made of stainless steel.
In order to overcome the defects, the person skilled in the art is actively researched to create a novel environment-friendly evaporator and a double-effect evaporation system using the evaporator.
Disclosure of Invention
The invention mainly solves the technical problems of providing an environment-friendly evaporator and a double-effect evaporation system using the same, wherein the evaporator is provided with a plurality of groups of heat exchange tube groups with inner layers and outer layers, wherein the inner wall of an outer tube, the outer wall of an inner tube and the inner wall can be used for evaporating and concentrating waste liquid, the area for evaporating and concentrating the waste liquid is greatly increased in the same volume evaporator, the production efficiency is greatly improved, the concentration and evaporation effects are good, in addition, a porous water distribution plate adopts a high-strength corrosion-resistant stainless steel galvanized plate, after being heated, the cracking resistance is strong, the service life of the evaporator is further prolonged, and therefore, the waste liquid evaporation and concentration effect of the double-effect evaporation system adopting the evaporator is strong, the efficiency is high, the production capacity is high, and the service life is long.
In order to solve the technical problems, the invention adopts a technical scheme that: the utility model provides an environment-friendly evaporator, which comprises a shell, an upper end cover fixed at the upper end of the shell and protruding upwards, and a lower end cover fixed at the lower end of the shell and protruding downwards; an upper porous water distribution plate and a lower porous water distribution plate are respectively arranged at the upper end and the lower end in the shell, the upper porous water distribution plate and the lower porous water distribution plate are arranged in parallel, a plurality of vertical heat exchange tube groups are fixed between the upper porous water distribution plate and the lower porous water distribution plate, and all the heat exchange tube groups are arranged in parallel and at intervals uniformly; the upper end cover is provided with a water inlet, and the lower end cover is provided with a steam-water outlet; the shell is provided with a spacer bush which is provided with a steam inlet and a condensate outlet;
each heat exchange tube group is a double-layer tube group comprising an inner tube and an outer tube, the outer tube is sleeved on the outer side of the inner tube, the inner tube is positioned at the axis of the outer tube, the vertical distance between the inner wall of the outer tube and the outer wall of the inner tube is 10-15mm, the wall thickness of the inner tube is 1.5-2.5mm, and the wall thickness of the outer tube is 2.5-3.5mm; the inner pipe and the outer pipe are welded and fixed through transverse metal connecting strips; the inner diameter of the outer pipe is 40-60mm, and the inner diameter of the inner pipe is 23-48mm;
the length of the outer pipe is greater than that of the inner pipe, the upper end and the lower end of the outer pipe are respectively fixed on the upper porous water distribution plate and the lower porous water distribution plate in a sealing mode, and a gap is reserved between the upper end and the lower end of the inner pipe and the upper porous water distribution plate and between the upper end and the lower porous water distribution plate respectively.
Further, the inner wall of the outer tube of the heat exchange tube group is provided with arc-shaped bulges at intervals, each arc-shaped bulge extends from the inner wall of the outer tube towards the axis direction, the vertical distance between the highest point of each arc-shaped bulge and the inner wall is 3-5mm, and the arrangement density of the arc-shaped bulges on the inner wall of the outer tube is 0.3-0.4 per mm 2 And the arrangement density of the arc-shaped protrusions gradually increases from the upper end to the lower end of the outer tube.
Further, a plurality of strip-shaped protrusions with arc-shaped sections are distributed on the outer wall of the inner tube of the heat exchange tube group at intervals, each strip-shaped protrusion extends from the upper end of the inner tube to the lower end of the inner tube along the outer wall of the inner tube, the vertical distance between the highest point of each strip-shaped protrusion and the outer wall of the inner tube is 6-8mm, and 4-8 strip-shaped protrusions are uniformly arranged on the outer wall of each inner tube along the circumferential direction of each strip-shaped protrusion.
Further, the upper end of the outer tube is welded to the upper porous water distribution plate, and the lower end of the outer tube is welded to the lower porous water distribution plate.
Further, the upper porous water distribution plate and the lower porous water distribution plate are both stainless steel galvanized plates.
Further, the inner tube and the outer tube are seamless stainless steel tubes or seamless plastic tubes.
Further, a shell or a lower end cover of the evaporator is also provided with a turnover plate type liquid level device or an observation window.
The invention also provides a double-effect evaporation system using the environment-friendly evaporator, which comprises a first evaporator group, a second evaporator group, a condenser, a crystallizer and a centrifugal machine which are sequentially connected according to a waste liquid treatment flow, wherein the first evaporator group and the second evaporator group both comprise the evaporator and a vapor-water separator, the vapor-water separator is provided with a vapor-water inlet, a vapor outlet and a water outlet, the vapor-water outlet of the evaporator is communicated with the vapor-water inlet of the vapor-water separator, the vapor-water outlet of the vapor-water separation of the first evaporator group is communicated with the vapor-water inlet of the evaporator of the second evaporator group, the vapor-water outlet of the vapor-water separation of the second evaporator group is externally connected with a drainage pipeline, and a water pump is arranged between the first evaporator group and the second evaporator group, between the condenser and between the crystallizer and the centrifugal machine through pipelines.
Further, the steam inlet of the evaporator of the first evaporator group is externally connected with a steam source, and the steam inlet of the evaporator of the second evaporator group is connected with the steam outlet of the steam-water separator of the first evaporator group.
The beneficial effects of the invention are as follows: the invention has at least the following advantages:
1. the evaporator provided by the invention has the advantages that the evaporator passes through a plurality of groups of inner and outer double-layer heat exchange tube groups, wherein the inner wall of the outer tube, the outer wall of the inner tube and the inner wall can be used for evaporating and concentrating waste liquid, compared with the traditional evaporator with a plurality of single tubes, the area for evaporating and concentrating waste liquid is greatly increased in the same-volume evaporator, so that the production efficiency is greatly improved, and the concentration and evaporation effects are good;
2. the outer wall of the inner tube of the heat exchange tube group of the evaporator can be provided with the strip-shaped bulges, the inner wall of the outer tube can be provided with the arc-shaped bulges, when waste liquid flows through the heat exchange tubes, the waste liquid flows down along the surfaces of the bulges, and compared with the traditional round tubes with the same tube diameter, the area of the waste liquid flowing through and the evaporation concentration time can be increased, so that the area for the evaporation concentration of the waste liquid is further increased by arranging the strip-shaped bulges or the arc-shaped bulges, the production efficiency is further improved, and the concentration evaporation effect is enhanced;
3. the upper porous water distribution plate of the evaporator is a high-strength corrosion-resistant stainless steel galvanized plate, the upper porous water distribution plate is subjected to the impact action of cold water and hot steam, the working environment is very bad, and compared with the traditional stainless steel plate, the upper porous water distribution plate of the evaporator has good corrosion resistance and durability, and has strong cracking resistance after being heated, long service life and further reduced use cost;
4. according to the double-effect evaporation system, the first evaporator group is externally connected with high-temperature steam, the second evaporator group fully utilizes the steam separated by the steam-water separator of the first evaporator group, so that heat energy can be effectively utilized, energy consumption is reduced, and production cost is reduced;
5. the evaporator is also provided with a turning type liquid level device or an observation window, so that the liquid level and liquid outlet condition can be observed, measures can be taken in time when the evaporator is abnormal, and the operation safety of equipment is improved.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic view showing the overall structure of embodiment 1 of the present invention;
fig. 2 is a schematic view of the internal structure of embodiment 1 of the present invention;
FIG. 3 is a plan view of a heat exchange tube group of the present invention (the outer wall of the inner tube is not provided with strip-like projections);
FIG. 4 is a plan view of a heat exchange tube group of the present invention (the outer wall of the inner tube is provided with strip-like projections);
FIG. 5 is a longitudinal cross-sectional view of an outer tube of the present invention;
fig. 6 is a schematic structural view of embodiment 2 of the present invention;
the parts in the drawings are marked as follows:
the evaporator 100, the shell 101, the upper end cover 102, the lower end cover 103, the upper porous water distribution plate 104, the lower porous water distribution plate 105, the heat exchange tube group 106, the inner tube 1061, the strip-shaped protrusions 10611, the outer tube 1062, the circular arc-shaped protrusions 10621, the metal connecting strips 1063, the spacer 107, the observation window 108, the water inlet 109, the condensed water outlet 110, the steam inlet 111, the steam water outlet 112, the steam water separator 200, the water pump 300, the condenser 400, the crystallizer 500, the centrifuge 600, the first evaporator group 1 and the second evaporator group 2.
Detailed Description
The following specific embodiments of the invention are described in order to provide those skilled in the art with an understanding of the present disclosure. The invention may be embodied in other different forms, i.e., modified and changed without departing from the scope of the invention.
Example 1: an environment-friendly evaporator 100, as shown in fig. 1 to 5, comprises a housing 101, an upper end cover 102 fixed to the upper end of the housing and protruding upward, and a lower end cover 103 fixed to the lower end of the housing and protruding downward; an upper porous water distribution plate 104 and a lower porous water distribution plate 105 are respectively arranged at the upper end and the lower end in the shell, the upper porous water distribution plate and the lower porous water distribution plate are arranged in parallel, a plurality of vertical heat exchange tube groups 106 are fixed between the upper porous water distribution plate and the lower porous water distribution plate, and all the heat exchange tube groups are arranged in parallel and at equal intervals; the upper end cover is provided with a water inlet 109, and the lower end cover is provided with a steam-water outlet 112; the housing is provided with a spacer 107 having a steam inlet 111 and a condensate outlet 110;
each heat exchange tube group 106 is a double-layer tube group comprising an inner tube 1061 and an outer tube 1062, the outer tube is sleeved outside the inner tube, the inner tube is positioned at the axis of the outer tube, the vertical distance between the inner wall of the outer tube and the outer wall of the inner tube is 10-15mm, the wall thickness of the inner tube is 1.5-2.5mm, and the wall thickness of the outer tube is 2.5-3.5mm; the inner pipe and the outer pipe are welded and fixed through a transverse metal connecting strip 1063; the inner diameter of the outer pipe is 40-60mm, and the inner diameter of the inner pipe is 23-48mm;
the length of the outer pipe is greater than that of the inner pipe, the upper end and the lower end of the outer pipe are respectively fixed on the upper porous water distribution plate and the lower porous water distribution plate in a sealing mode, and a gap is reserved between the upper end and the lower end of the inner pipe and the upper porous water distribution plate and between the upper end and the lower porous water distribution plate respectively.
The inner wall of the outer tube 1062 of the heat exchange tube group 106 is provided with arc-shaped protrusions 10621 at intervals, each arc-shaped protrusion extends from the inner wall of the outer tube toward the axial direction, the vertical distance between the highest point of each arc-shaped protrusion and the inner wall is 3-5mm, and the arrangement density of the arc-shaped protrusions on the inner wall of the outer tube is 0.3-0.4/mm 2 And the arrangement density of the arc-shaped protrusions gradually increases from the upper end to the lower end of the outer tube.
A plurality of strip-shaped protrusions 10611 with arc-shaped sections are arranged on the outer wall of the inner tube 1061 of the heat exchange tube group 106 at intervals, each strip-shaped protrusion extends from the upper end of the inner tube to the lower end of the inner tube along the outer wall of the inner tube, the vertical distance between the highest point of each strip-shaped protrusion and the outer wall of the inner tube is 6-8mm, and 4-8 strip-shaped protrusions are uniformly arranged on the outer wall of each inner tube along the circumferential direction of each strip-shaped protrusion.
The upper end of the outer pipe 1062 is welded to the upper porous water distribution plate 104, and the lower end of the outer pipe 1062 is welded to the lower porous water distribution plate 105.
The upper porous water distribution plate 104 and the lower porous water distribution plate 105 are both stainless steel galvanized plates.
The inner tube 1061 and the outer tube 1062 are seamless stainless steel tubes or seamless plastic tubes.
The shell 101 or the lower end cover 103 of the evaporator 100 is also provided with a flap type liquid level device or an observation window 108.
Example 2: an evaporation system using the environment-friendly evaporator according to embodiment 1, as shown in fig. 6 (the open arrow indicates the flow direction of steam, the solid arrow indicates the flow direction of steam or water), comprising a first evaporator group 1, a second evaporator group 2, a condenser 400, a crystallizer 500 and a centrifuge 600 sequentially connected according to the waste liquid treatment process, wherein the first evaporator group and the second evaporator group each comprise the evaporator 100 and the steam-water separator 200, the steam-water separator comprises a steam-water inlet, a steam-water outlet and a water outlet, the steam-water outlet of the evaporator is communicated with the steam-water inlet of the steam-water separator, the steam-water separated steam outlet of the first evaporator group is communicated with the steam-water inlet of the evaporator of the second evaporator group, the steam-water separated steam outlet of the two evaporator groups is externally connected with an exhaust pipe, the water outlet of the steam-water separator is externally connected with a drain pipe, and the water pump is provided between the first evaporator group and the second evaporator group, between the second evaporator group and the condenser and the crystallizer and the water separator and the centrifuge.
The steam inlet of the evaporator of the first evaporator group is externally connected with a steam source, and the steam inlet of the evaporator of the second evaporator group is connected with the steam outlet of the steam-water separator of the first evaporator group.
The working principle and working process of the invention are as follows:
the waste liquid is pumped into the evaporator through a water pump, flows down along the inner wall of the outer pipe of the heat exchange pipe group, the outer wall and the inner wall of the inner pipe after being distributed through the upper porous water distribution plate, and is externally connected with steam to enter a spacer bush, the waste liquid and the steam are subjected to heat exchange, condensed water is formed after the heat release of the steam, and then the condensed water is delivered to a special collecting device through a condensed water discharge port, meanwhile, the waste liquid absorbs heat and is evaporated and concentrated, overflows to enter a steam-water separation chamber, the concentrated waste liquid is subjected to gas-liquid separation in the separation chamber, gas enters the evaporator of the next evaporator group to be used as a heat source, the separated liquid enters the evaporator of the next evaporator group under the action of the water pump, and is continuously evaporated and concentrated in the same manner until the liquid enters a condenser to be condensed after passing through the two evaporator groups, enters a crystallizer to be crystallized, and then enters a centrifugal machine to be centrifuged after being crystallized, and packaged and transported outwards.
In addition, the steam-water separator, the condenser, the crystallizer, the centrifuge and the water pump are all in the prior art, so that the description is omitted.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures made by the description of the invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the invention.
Claims (5)
1. An environment-friendly evaporator is characterized in that: comprises a shell (101), an upper end cover (102) fixed at the upper end of the shell and protruding upwards, and a lower end cover (103) fixed at the lower end of the shell and protruding downwards; an upper porous water distribution plate (104) and a lower porous water distribution plate (105) are respectively arranged at the upper end and the lower end in the shell, the upper porous water distribution plate and the lower porous water distribution plate are arranged in parallel, a plurality of vertical heat exchange tube groups (106) are fixed between the upper porous water distribution plate and the lower porous water distribution plate, and all the heat exchange tube groups are arranged in parallel and at equal intervals; the upper end cover is provided with a water inlet (109), and the lower end cover is provided with a steam-water outlet (112); the shell is provided with a spacer bush (107) which is provided with a steam inlet (111) and a condensed water outlet (110);
each heat exchange tube group (106) is a double-layer tube group comprising an inner tube (1061) and an outer tube (1062), the outer tube is sleeved outside the inner tube, the inner tube is positioned at the axis of the outer tube, the vertical distance between the inner wall of the outer tube and the outer wall of the inner tube is 10-15mm, the wall thickness of the inner tube is 1.5-2.5mm, and the wall thickness of the outer tube is 2.5-3.5mm; the inner pipe and the outer pipe are welded and fixed through transverse metal connecting strips (1063); the inner diameter of the outer pipe is 40-60mm, and the inner diameter of the inner pipe is 23-48mm;
the length of the outer pipe is longer than that of the inner pipe, the upper end and the lower end of the outer pipe are respectively fixed on the upper porous water distribution plate and the lower porous water distribution plate in a sealing way, and a gap is reserved between the upper end and the lower end of the inner pipe and the upper porous water distribution plate and the lower porous water distribution plate respectively;
the upper porous water distribution plate and the lower porous water distribution plate are both stainless steel galvanized plates;
the inner pipe and the outer pipe are seamless stainless steel pipes or seamless plastic pipes;
arc-shaped protrusions (10621) are arranged on the inner wall of the outer tube of the heat exchange tube group at intervals, each arc-shaped protrusion extends from the inner wall of the outer tube towards the axis direction, the vertical distance between the highest point of each arc-shaped protrusion and the inner wall is 3-5mm, and the arrangement density of the arc-shaped protrusions on the inner wall of the outer tube is 0.3-0.4/mm 2 The arrangement density of the arc-shaped protrusions gradually increases from the upper end to the lower end of the outer tube;
a plurality of strip-shaped protrusions (10611) with arc-shaped sections are distributed on the outer wall of the inner tube of the heat exchange tube group at intervals, each strip-shaped protrusion extends from the upper end of the inner tube to the lower end of the inner tube along the outer wall of the inner tube, the vertical distance between the highest point of each strip-shaped protrusion and the outer wall of the inner tube is 6-8mm, and 4-8 strip-shaped protrusions are uniformly arranged on the outer wall of each inner tube along the circumferential direction of each strip-shaped protrusion.
2. The environmentally friendly evaporator according to claim 1, wherein: the upper end of the outer pipe is welded to the upper porous water distribution plate, and the lower end of the outer pipe is welded to the lower porous water distribution plate.
3. The environmentally friendly evaporator according to claim 1, wherein: the shell or the lower end cover of the evaporator is also provided with a turnover plate type liquid level device or an observation window (108).
4. A dual effect evaporation system using the environmentally friendly evaporator of claim 1, wherein: including first evaporator group (1), second evaporator group (2), condenser (400), crystallizer (500) and centrifuge (600) that connect gradually according to waste liquid treatment flow, first evaporator group with second evaporator group all includes evaporimeter (100) and vapour and water separator (200), vapour and water separator have vapour and water inlet, vapour and water outlet of evaporimeter with vapour and water separator's vapour and water inlet intercommunication, first evaporator group's vapour and water separator's vapour and water outlet with the vapour and water inlet intercommunication of the evaporimeter of second evaporator group, the external exhaust pipe of vapour and water separator's water outlet, between first evaporator group and the second evaporator group, between the second evaporator group with between the condenser, between the condenser and between the crystallizer with through pipeline intercommunication between the centrifuge, be equipped with water pump (300) on the pipeline.
5. The dual effect evaporation system according to claim 4, wherein: the steam inlet of the evaporator of the first evaporator group is externally connected with a steam source, and the steam inlet of the evaporator of the second evaporator group is connected with the steam outlet of the steam-water separator of the first evaporator group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710445905.3A CN107126720B (en) | 2017-06-14 | 2017-06-14 | Environment-friendly evaporator and double-effect evaporation system using same |
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| CN201710445905.3A CN107126720B (en) | 2017-06-14 | 2017-06-14 | Environment-friendly evaporator and double-effect evaporation system using same |
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| CN107126720A CN107126720A (en) | 2017-09-05 |
| CN107126720B true CN107126720B (en) | 2023-09-08 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108114493B (en) * | 2018-01-22 | 2023-07-07 | 南京工程学院 | Heat source tower solution concentration device and concentration method thereof |
| CN109631622B (en) * | 2018-12-17 | 2020-03-10 | 重庆华森制药股份有限公司 | Water cooling circulation structure for double-effect concentration recovery unit cooler |
| CN111760307A (en) * | 2020-07-16 | 2020-10-13 | 天津恒脉机电科技股份有限公司 | Environment-friendly tubular falling film evaporation system |
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| CN201266031Y (en) * | 2008-09-07 | 2009-07-01 | 李勇强 | Heat exchanger |
| EP2287507A2 (en) * | 2009-07-07 | 2011-02-23 | ELB-Form GmbH | Double-wall tube, method for its manufacture and application |
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| CN107126720A (en) | 2017-09-05 |
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