CN209809544U - Split type tubular falling film evaporator - Google Patents
Split type tubular falling film evaporator Download PDFInfo
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- CN209809544U CN209809544U CN201920050575.2U CN201920050575U CN209809544U CN 209809544 U CN209809544 U CN 209809544U CN 201920050575 U CN201920050575 U CN 201920050575U CN 209809544 U CN209809544 U CN 209809544U
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- falling film
- separator
- tubular falling
- film heater
- secondary steam
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- 239000011552 falling film Substances 0.000 title claims abstract description 58
- 239000007788 liquid Substances 0.000 claims abstract description 43
- 239000010408 film Substances 0.000 claims abstract description 14
- 230000008676 import Effects 0.000 claims abstract description 3
- 238000005507 spraying Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 7
- 238000007701 flash-distillation Methods 0.000 abstract description 4
- 239000012528 membrane Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 description 20
- 230000008020 evaporation Effects 0.000 description 20
- 239000003513 alkali Substances 0.000 description 16
- 238000000926 separation method Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000013461 design Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model relates to a split type tubular falling film evaporator, including tubular falling film heater, be connected with the upper cover in tubular falling film heater's upper end, cover on and be provided with the solution import, tubular falling film heater lower extreme be connected with a liquid trap, be connected with a communicating pipe on the liquid trap lateral wall, a separator is connected to the communicating pipe other end, the internal diameter and the volume of separator all are greater than the liquid trap, are provided with the secondary steam export on the separator, the secondary steam export is located communicating pipe and separator connection interface top. The utility model discloses connect a liquid trap at tubular falling liquid film heater lower extreme and be used for collecting the solution after the heating and the secondary steam that the membrane type heat transfer in-process generated, secondary steam and solution pass through the major diameter and get into in the separator that flash distillation area and space are bigger communicating pipe to improve the flash distillation effect.
Description
The technical field is as follows:
the utility model belongs to the technical field of the evaporimeter, in particular to split type tubular falling film evaporation ware.
Background art:
in recent years, with the successful popularization and application of the technology of a domestic tubular falling film evaporator, the technical problems of high steam consumption, low circulation efficiency, easy scaling, substandard evaporation capacity and the like of an old natural circulation evaporator are effectively solved. The energy production of the multi-effect tube type falling film evaporator set is gradually increased from the initial 150T/H, 200T/H and the like to 400T/H and 450T/H, and the maximum design energy production of the evaporator set in China at present reaches 500T/H. With the continuous improvement of the capacity of the evaporation design, the structural design of the original tubular falling-film evaporator has some defects, which bring some problems to the design, manufacture and operation of the evaporator. The original tubular falling-film evaporator is of an integrated structure, namely, components such as an upper cover, a film distributor and the like and a heating chamber are inserted into a cylinder body of a separation chamber, and the separation chamber is used as a component for vapor-liquid separation of solution and a supporting device for the components such as the heating chamber. With the upsizing of evaporator equipment, the integral structure mainly has the following defects:
(1) insufficient flash space of the solution: along with the increase of the evaporation design capacity, the evaporation capacity of single-effect equipment is also continuously improved, a heating chamber is inserted into a separation chamber, a part of flash evaporation space is occupied, and the contradiction affecting the evaporation efficiency is obvious;
(2) the lower part of the heating chamber is easy to be damaged: the lower part of the heating chamber is inserted into the separation chamber, so that the lower tube plate and the lower barrel are soaked in alkali liquor and alkali steam, and under the working conditions of high temperature and high alkali concentration, stress corrosion is easy to occur on the lower part of the heating chamber, particularly on the welding seams of the tube plate and the heating chamber barrel, so that alkali brittleness is caused, the operation rate of equipment is influenced, and the service life of the equipment is shortened;
(3) the condensed water outlet pipe is easy to leak: the condensed water outlet pipe of the heating chamber is led out from the lower part of the heating chamber through the separation chamber, the condensed water pipe, the heating chamber and the barrel of the separation chamber are all connected by welding, and the integrated structure ensures that the condensed water pipe is in the corrosion working condition of alkali liquor and alkali steam and under the harsh condition of temperature difference expansion deformation of the shell of the heating chamber and the heat exchange pipe, the welding seam of the connecting angle of the condensed water outlet pipe and the shell of the heating chamber is easy to leak, the maintenance is extremely inconvenient, the maintenance effect is not good, and the normal; the leakage of the welding line of the condensate pipe easily causes the alkali in the steam condensate water, thereby influencing the subsequent use of the condensate water and increasing the production and operation cost.
(4) The secondary steam is easy to generate the problem of alkali carrying: the integral structure enables the steam-liquid separator to be only arranged in an annular space formed by the heating chamber and the separating chamber, the arrangement area is insufficient, the workload of the steam-liquid separator is increased, the escape speed of secondary steam is increased, and secondary steam is easy to bring alkali.
(5) Increase the installation and the steel construction design degree of difficulty: evaporator equipment specification, load increase are more, and the structure of integral type causes the local each item load increase of steel construction more easily, increases the degree of difficulty for the installation of equipment, the design of steel construction, increases the installation cost simultaneously.
The utility model has the following contents:
the utility model discloses the technical problem that will solve is: the split type tubular falling film evaporator has the advantages of large flash evaporation space and better flash evaporation effect.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a split type tubular falling film evaporator, includes tubular falling film heater, is connected with the upper cover in tubular falling film heater's upper end, covers on and is provided with the solution import, tubular falling film heater lower extreme be connected with a liquid trap, be connected with a communicating pipe on the liquid trap lateral wall, a separator is connected to the communicating pipe other end, the internal diameter and the volume of separator all are greater than the liquid trap, and separator upper portion is provided with the secondary steam export.
Preferably, the bottom of the liquid trap is tapered.
Preferably, the bottom of the separator is tapered.
Preferably, the top of the separator is tapered.
As a preferable scheme, the upper end of the tubular falling film heater is connected with a film distributor which is positioned in the upper cover, and the solution inlet is positioned above the film distributor.
Preferably, the shell of the tubular falling film heater is connected with a noncondensing gas pipe, and two ends of the noncondensing gas pipe are respectively communicated with the inner part of the upper cover and the shell side of the tubular falling film heater.
As a preferable scheme, a demister is arranged at the upper part of the separator to divide the separator into an upper space and a lower space, the communicating pipe is communicated with the space below the communicating pipe, and the secondary steam outlet is positioned above the demister.
Preferably, spraying devices which spray towards the demister are respectively arranged above and below the demister.
The utility model has the advantages that: the utility model discloses connect a liquid trap at tubular falling liquid film heater lower extreme and be used for collecting the solution after the heating and the secondary steam that the diaphragm type heat transfer in-process generated, secondary steam and solution at first gather in the liquid trap, reach after a certain amount through the major diameter entering separator that internal diameter and volume are bigger communicating pipe in, solution flash distillation area and space obtain enlarging to improve the flash distillation effect.
The secondary steam is enriched in the liquid collector, so that the pressure inside the liquid collector is higher than that of the separator, and after the solution in the liquid collector enters the separator, the pressure of the solution is reduced, and the flash evaporation effect is further promoted.
The tubular falling film heater and the separator are arranged in parallel and in a split manner, so that the lower part of the tubular falling film heater is prevented from working under a harsh alkali corrosion working condition, the service life of equipment is prolonged, the normal operation of the equipment is ensured, and the powerful guarantee is provided for the normal operation of the subsequent production in a plant area.
The tubular falling film heater and the separator are arranged in parallel and in a split mode, so that the demister can be fully distributed in the whole diameter range of the separator, secondary steam is ensured to flow out from a secondary steam outlet after being fully separated by the demister, and the long-standing problem that the secondary steam carries alkali is solved.
Description of the drawings:
the following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of the present invention.
In fig. 1: 1. the tubular falling film heater comprises a tubular falling film heater body 2, an upper cover 3, a solution inlet 4, a liquid collector 5, a liquid collecting chamber 6, a communicating pipe 7, a separator 8, a secondary steam outlet 9, a film distributor 10, a non-condensing pipe 11, a demister 12, a spraying device 13, a condensing pipe 14, a support 15, a solution outlet 16, a solution circulating outlet 17 and a steam inlet.
The specific implementation mode is as follows:
the following describes in detail a specific embodiment of the present invention with reference to the drawings.
As shown in figure 1, the split-type tubular falling film evaporator comprises a tubular falling film heater 1, the upper end of the tubular falling film heater 1 is connected with a dome-shaped upper cover 2 through a flange, the top of the upper cover 2 is provided with a solution inlet 3, the side wall of the tubular falling film heater 1 is provided with a plurality of steam inlets 17 communicated with a shell pass, the lower end of the tubular falling film heater 1 is connected with a cylindrical liquid collector 4 through a flange, the inside of the liquid collector 4 is a liquid collecting chamber 5 communicated with the tube pass of the tubular falling film heater 1, the side wall of the liquid collector 4 is connected with a communicating pipe 6 communicated with the liquid collecting chamber 5, the other end of the communicating pipe 6 is connected with a separator 7, the communicating pipe 6 is obliquely arranged, one end of the communicating pipe 6 positioned at the liquid collector 4 is higher than one end positioned at the separator 7, the inner diameter and the volume of the separator 7 are both larger than, the secondary steam outlet 8 is positioned above the connection interface of the communicating pipe 6 and the separator 7, and the secondary steam outlet 8 is arranged at the top end of the conical top of the separator 7 in the embodiment.
As shown in fig. 1, the bottom of the collector 4 is tapered so that the solution has a larger evaporation area for the preliminary flash, and the boiling solution is in the upper liquid level, ensuring that the solution entering the separator 7 is all at boiling for faster flash.
The inner diameter and the volume of the separator 7 are larger than those of the liquid collector 4, and after the solution enters the separator 7, the flash evaporation area and space are enlarged, so that the flash evaporation effect is improved.
The bottom of the separator 7 is also tapered to reduce the solution below the liquid level in the separator 7, a solution circulation outlet 16 is arranged on the inclined plane of the tapered bottom of the separator 7 and can convey the solution back to the tube-type falling film heater 1, and a solution outlet 15 is arranged at the lower end of the tapered bottom of the separator 7 and is used for discharging the solution.
The upper end of the tubular falling film heater 1 is connected with a film distributor 9, the film distributor 9 is positioned in the upper cover 2, the solution inlet 3 is positioned above the film distributor 9, the solution enters the upper cover 2 from the solution inlet 3, flows into the heating pipe of the tubular falling film heater 1 after being uniformly distributed by the film distributor 9, and the formed film flows downwards along the pipe wall and is subjected to sufficient heat exchange with heating steam in the shell pass.
The shell of the tubular falling film heater 1 is connected with a noncondensable gas pipe 10, two ends of the noncondensable gas pipe 10 are respectively communicated with the inside of the upper cover 2 and the shell pass of the tubular falling film heater 1, noncondensable gas in the shell pass of the tubular falling film heater 1 enters the upper cover 2 through the noncondensable gas pipe 10 and flows downwards along the heating pipe to be combined with noncondensable gas in secondary steam for treatment, and the heat exchange efficiency of the tubular falling film heater 1 is prevented from being influenced by the noncondensable gas accumulated in the shell pass.
The upper portion of separator 7 is provided with demister 11, and demister 11 can be covered along the whole diameter within range of separator, ensures that the alkali lye that carries in the secondary steam drips through the abundant vapor-liquid separation back of demister, and the secondary steam flows out from secondary steam export 8. Demister 11 divides into two spaces about separator 7, communicating pipe 6 and the space intercommunication that is located the below, the secondary steam that produces in demister 11 below upwards evenly passes through demister 11, carries out abundant vapour-liquid separation back, discharges from secondary steam export 8, because secondary steam export 8 in this embodiment sets up on separator 7 toper top end for 11 each parts of demister remove the foam load balance, avoid demister 11 local load to lead to the phenomenon of local damage or running alkali excessively.
The upper side and the lower side of the demister 11 are respectively provided with a spraying device 12 which sprays towards the demister 11, the demister 11 can be fully sprayed and cleaned during the maintenance of the evaporator, and the spraying device 12 can be a spraying pipe with spraying holes formed in the side wall or a plurality of spraying heads.
The lower end of the shell of the tubular falling film heater 1 is connected with an S-shaped condensate pipe 13 for discharging condensate water, the other end of the condensate pipe 13 is connected with a condensate water tank (not shown in the figure), and the S-shaped condensate pipe 13 has a certain elastic deformation amount and can be used for compensating the size change of the tubular falling film heater 1 caused by expansion with heat and contraction with cold, and the joints at the two ends of the condensate pipe 13 are prevented from being damaged.
The tube type falling film heater and the separator are arranged in parallel and in a split mode, so that the condensate pipe 13 is prevented from being under the working conditions of corrosion of alkali liquor and alkali steam and the harsh conditions of temperature difference expansion deformation of the shell of the tube type falling film heater and the heat exchange pipe.
The bottom of liquid trap 4 and separator 7 is provided with support 14 respectively, has solved the too big problem of steel construction local load that the integral type structure caused easily, has reduced the hoist and mount and the installation degree of difficulty of equipment, has reduced the material use amount of steel construction, installation cost greatly reduced.
The secondary steam outlet 8 can be communicated with a negative pressure device, the negative pressure device can be a vacuum pump or an air extractor, the negative pressure device can rapidly extract the secondary steam in the separator 7, the pressure in the separator 7 is ensured to be in a stable state, and the flash evaporation efficiency is improved.
The utility model discloses the theory of operation is: as shown in figure 1, the induced steam enters the shell pass of the tubular falling film heater 1 through a steam inlet 17, the solution enters the upper cover 2 from a solution inlet 3, the solution is uniformly coated by a membrane distributor 9 and then flows into the heating tube of the tubular falling film heater 1, a membrane-forming shape flows downwards along the tube wall, the solution enters the liquid collecting chamber 5 after being subjected to sufficient heat exchange with the heating steam in the shell pass, the solution on the upper surface is subjected to primary flash evaporation in the liquid collecting chamber 5 to form secondary steam, so that the air pressure in the liquid collecting chamber 5 is at a higher level, the solution with the liquid level higher than the nozzle of the communicating tube 6 in the liquid collecting chamber 5 flows into the large-diameter large-volume separator 7 through the communicating tube 6, and due to the expansion of the flash evaporation area and the relative reduction of the air pressure, the liquid enters the separator 7 and then is subjected to vigorous boiling evaporation, the secondary steam escapes sufficiently, the evaporation efficiency is effectively improved, the evaporation capacity is ensured, and the secondary, as the demister is fully distributed in the whole diameter range of the separator 7, the secondary steam is ensured to flow out from the secondary steam outlet 8 after alkali liquor drops carried in the secondary steam are fully subjected to vapor-liquid separation by the demister. The concentrated solution is discharged through a solution outlet 15 or a solution recycling outlet 16 arranged at the conical bottom of the separator 7.
In order to increase the secondary steam discharge rate, the flash evaporation efficiency can be further increased by connecting a negative pressure device to the secondary steam outlet 8.
The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.
Claims (8)
1. The utility model provides a split type tubular falling film evaporator, includes tubular falling film heater (1), is connected with upper cover (2) in the upper end of tubular falling film heater (1), is provided with solution import (3) on upper cover (2), its characterized in that: the tubular falling film heater is characterized in that the lower end of the tubular falling film heater (1) is connected with a liquid collector (4), a communicating pipe (6) is connected to the side wall of the liquid collector (4), the other end of the communicating pipe (6) is connected with a separator (7), the inner diameter and the volume of the separator (7) are larger than those of the liquid collector (4), and a secondary steam outlet (8) is formed in the upper portion of the separator (7).
2. A split tube falling film evaporator according to claim 1 wherein the bottom of the liquid trap (4) is tapered.
3. A split tube falling film evaporator according to claim 1 wherein the bottom of the separator (7) is tapered.
4. A split tube falling film evaporator according to claim 1 wherein the top of the separator (7) is tapered.
5. A split tube falling film evaporator according to claim 1 wherein the tube falling film heater (1) has a film distributor (9) attached to its upper end, the film distributor (9) being located within the upper head (2) and the solution inlet (3) being located above the film distributor (9).
6. The split-type tubular falling film evaporator according to claim 1, wherein the shell of the tubular falling film heater (1) is connected with a noncondensing gas pipe (10), and two ends of the noncondensing gas pipe (10) are respectively communicated with the inside of the upper cover (2) and the shell side of the tubular falling film heater (1).
7. A split tube falling-film evaporator according to claim 1, characterised in that a demister (11) is provided above the separator (7) to divide the separator (7) into upper and lower spaces, the communicating tube (6) communicates with the space below, and the secondary steam outlet (8) is located above the demister (11).
8. A split tube falling-film evaporator according to claim 7, characterised in that spray devices (12) spraying towards the demister (11) are provided above and below the demister (11), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920050575.2U CN209809544U (en) | 2019-01-11 | 2019-01-11 | Split type tubular falling film evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920050575.2U CN209809544U (en) | 2019-01-11 | 2019-01-11 | Split type tubular falling film evaporator |
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| Publication Number | Publication Date |
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| CN209809544U true CN209809544U (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920050575.2U Active CN209809544U (en) | 2019-01-11 | 2019-01-11 | Split type tubular falling film evaporator |
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| Country | Link |
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| CN (1) | CN209809544U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109568998A (en) * | 2019-01-11 | 2019-04-05 | 江苏普格机械有限公司 | A kind of split-type tube type falling film evaporator |
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2019
- 2019-01-11 CN CN201920050575.2U patent/CN209809544U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109568998A (en) * | 2019-01-11 | 2019-04-05 | 江苏普格机械有限公司 | A kind of split-type tube type falling film evaporator |
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Address after: 215600 HAIBA Road, Daxin Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: China National Chemical Equipment Technology (Suzhou) Co.,Ltd. Country or region after: China Address before: 215600 Jiangsu Puge Machinery Co., Ltd., HAIBA Road, Daxin Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: JIANGSU PUGE MACHINERY Co.,Ltd. Country or region before: China |