CN210367048U - Double-stage preheating thermal power steam compression type vertical pipe climbing film evaporation sea water desalination device - Google Patents
Double-stage preheating thermal power steam compression type vertical pipe climbing film evaporation sea water desalination device Download PDFInfo
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- 230000009194 climbing Effects 0.000 title claims abstract description 61
- 238000001704 evaporation Methods 0.000 title claims abstract description 39
- 230000008020 evaporation Effects 0.000 title claims abstract description 39
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 33
- 230000006835 compression Effects 0.000 title claims abstract description 21
- 238000007906 compression Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 230000000694 effects Effects 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000011033 desalting Methods 0.000 claims abstract description 3
- 239000013505 freshwater Substances 0.000 claims description 68
- 239000007921 spray Substances 0.000 claims description 11
- 239000012530 fluid Substances 0.000 claims description 6
- 239000012267 brine Substances 0.000 claims description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 5
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- 239000007788 liquid Substances 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 239000010865 sewage Substances 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 109
- 238000010586 diagram Methods 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000011552 falling film Substances 0.000 description 2
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- 206010057040 Temperature intolerance Diseases 0.000 description 1
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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
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Abstract
A double-stage preheating thermodynamic vapor compression type vertical pipe climbing film evaporation seawater desalination device belongs to the technical field of seawater desalination, thermosensitive feed liquid concentration and sewage treatment. The desalting device is characterized in that the vertical tube film evaporators of the first effect are connected in a downstream feeding mode, the two-stage preheater is arranged at the front end of the vertical tube film evaporator of the first effect, and the thermal power steam compressor is adopted to extract part of secondary steam of the vertical tube film evaporator of the last effect, so that the heat load of the condenser is reduced, and the heat extraction loss of the condenser and the heat exchange area of the condenser are reduced; meanwhile, the secondary steam extracted by the thermal steam compressor is heated and pressurized to serve as first-effect heating steam, so that the energy loss of direct temperature and pressure reduction is reduced, the flow of working steam is reduced, and the water making ratio is increased; the seawater is preheated by two stages by using the condensed water and part of the secondary steam of the first-effect vertical tube climbing-film evaporator, the seawater temperature is raised, and the preheating quantity of the first-effect evaporator is reduced, so that the consumption of heating steam is reduced, and the water making ratio is increased.
Description
Technical Field
The utility model relates to a heating power steam compression formula standpipe rising film evaporation sea water desalination device that doublestage preheats, it belongs to sea water desalination, heat sensitivity feed liquid concentration and sewage treatment technical field.
Background
The large and medium-sized ships/offshore platforms are equipped with seawater desalination devices because the ships sailing in the open sea and the offshore platforms operating on the sea consume a large amount of fresh water for personnel and equipment. The distillation method for preparing fresh water is still the technology commonly adopted by the common sea water desalination device for the offshore platform/ship at present. Among the three common forms of multi-effect evaporators (vertical tube climbing film evaporation, vertical tube falling film evaporation, horizontal tube falling film evaporation), the vertical tube climbing film evaporator has the remarkable characteristics: the method is most suitable for utilizing low-quality waste heat energy under the condition of medium and small scale; the swing and the shaking of the ship have little influence on the formation of a liquid film in the vertical pipe climbing film evaporator and the heat exchange characteristic, and the ship has the anti-swing performance required by the sea berth seawater desalination device; the feeding mode is simple and easy to control; the structure is simple, the manufacturing and installation requirements are low, the operation and the running are convenient, and the like; the evaporation time is short, the heat transfer efficiency is high, and the local heat exchange coefficient of the feed seawater and the heat exchange surface can reach more than 6000W/square meter K under the condition of low evaporation temperature; due to the lower operation temperature, the scaling phenomenon is effectively controlled; is the evaporator with lowest cost per unit volume. The characteristics of the vertical pipe climbing film evaporator are comprehensively considered, and the vertical pipe climbing film evaporator is a proper choice for meeting the requirement of sea water desalination of an offshore platform/ship under the condition that the offshore platform and the ship have a large amount of available flue gas waste heat and engine cooling water waste heat.
The conventional French steam power helicopter aircraft carrier 'Zhende' is provided with three riser double-effect climbing film evaporation seawater desalination devices to meet the requirement of water consumption of the whole carrier, the device firstly heats steam from a waste steam main pipe or high-pressure steam to be used through pressure reduction, and exhaust steam with gauge pressure of 0.1MPa and 280 ℃ is generally used through pressure reduction to be 0.045MPa and low-pressure saturated steam with the temperature of 78 ℃ so as to reduce the scaling risk of an evaporator, but the energy loss in the pressure reduction process is large, so that the patent, namely the two-stage preheating thermodynamic steam riser compression climbing film evaporation seawater desalination device, is provided.
The vertical pipe climbing film evaporator structure in the patent application is based on the patent of the earlier granted utility model, and a vertical pipe gushing boiling seawater evaporator (patent number: ZL 201110162485.0) comprises a lower pipe box, an upper pipe box, an evaporator pipe bundle, a down pipe (arranged at the center of the vertical pipe climbing film evaporator), a wire mesh demister, a steam inlet pipe, a fresh water outlet pipe, a seawater inlet pipe, a concentrated seawater outlet pipe and the like.
Disclosure of Invention
This patent aims at providing a steam heat compression formula standpipe lift membrane evaporation sea water desalination device that doublestage preheats. Aiming at the problems that the pressure reduction loss of high-pressure working steam in a vertical tube film-rising evaporation seawater desalination device is large and the water making ratio of the device further improves the space, a thermodynamic steam compressor (namely a steam ejector) is added in the vertical tube film-rising evaporation device to reduce the energy loss caused by directly reducing the temperature and the pressure of the working steam. Besides steam-powered ships, the device also has wide application prospects on large and medium ships and offshore platforms with steam heat sources, which are provided with flue gas waste heat boilers and take diesel engines and gas turbines as power.
The technical scheme that this patent adopted is: a double-stage preheated thermodynamic vapor compression type vertical-tube climbing-film evaporation seawater desalination device comprises a vertical-tube climbing-film evaporator, a condenser, a feed seawater pump, a fresh water pump and a strong brine pump, wherein the devices are connected by pipelines; the vertical tube climbing film evaporator is a cylindrical shell-and-tube heat exchanger, and is internally provided with an evaporation tube bundle, a downcomer, a concentrated seawater outlet pipe and a demister; the desalting device also comprises a thermal power steam compressor, a water spray desuperheater, a first-stage preheater, a second-stage preheater and a fresh water flash tank, wherein the multiple-effect vertical tube climbing-film evaporators are connected in a downstream feeding mode, the two-stage preheater is arranged at the front end of the first-effect vertical tube climbing-film evaporator, steam condensate water and part of secondary steam of the first-effect vertical tube climbing-film evaporators are used for preheating feed seawater respectively, and the thermal power steam compressor is used for pumping part of the secondary steam of the last-effect vertical tube climbing-film evaporators to heat the first-effect; a concentrated seawater outlet pipe of a lower pipe box of each vertical pipe climbing-film evaporator is connected with a seawater inlet pipe of a lower pipe box of a next vertical pipe climbing-film evaporator, and the concentrated seawater is sequentially fed and connected downstream until concentrated seawater of a last vertical pipe climbing-film evaporator is led to a concentrated seawater pump discharge device through the concentrated seawater outlet pipe; two steam outlets are arranged on the upper pipe box of the first-effect vertical pipe climbing-film evaporator, one steam outlet is connected with the second-stage preheater, and the other steam outlet is connected with a heating steam inlet of the shell pass of the next-effect vertical pipe climbing-film evaporator.
The upper pipe box of the intermediate-effect vertical pipe climbing-film evaporator is provided with a steam outlet which is connected with a heating steam inlet of the shell pass of the next-effect vertical pipe climbing-film evaporator; the upper pipe box of the last effect standpipe climbing film evaporator is provided with 2 steam outlets, one steam outlet is connected with the inlet of the suction chamber of the thermal power steam compressor, and the other steam outlet is connected with the condenser.
The first-stage preheater is connected with a seawater outlet of the condenser through a seawater conveying pipeline, the seawater conveying pipeline connecting the first-stage preheater and the condenser adopts a three-way pipe, only part of feed seawater enters the first-stage preheater, the rest is discharged as cooling seawater, and a hot fluid inlet of the first-stage preheater is connected with a condensate water outlet of a shell pass of the first-effect vertical tube climbing film evaporator; the feed seawater inlet of the second-stage preheater is connected with the seawater outlet of the first-stage preheater, the hot fluid inlet of the second-stage preheater is connected with the preheated steam outlet of the upper tube box of the first-effect vertical tube climbing film evaporator, and the seawater outlet of the second-stage preheater is connected with the feed seawater inlet of the lower tube box of the first-effect vertical tube climbing film evaporator.
The working nozzle of the thermal power steam compressor adopts a Laval nozzle, the inlet of a suction chamber of the Laval nozzle is connected with a secondary steam outlet of the last-effect vertical tube climbing film evaporator, a mixed steam outlet of the thermal power steam compressor is provided with a water spray desuperheater, a desuperheater water inlet of the water spray desuperheater is connected with a condensed water outlet pipe of the first-effect vertical tube climbing film evaporator, and an outlet of the water spray desuperheater is connected with a heating steam inlet of a shell pass of the first-effect vertical tube climbing film evaporator.
The condensate water outlet of the secondary preheater and the condensate water outlet of the second-effect vertical-tube climbing-film evaporator are respectively connected with 2 fresh water inlets of the second-effect fresh water flash tank, the flash steam outlet of the second-effect fresh water flash tank is connected with the shell pass steam side space of the next-effect vertical-tube climbing-film evaporator, and the fresh water outlet of the second-effect fresh water flash tank is connected with the fresh water inlet of the next-effect fresh water flash tank through a fresh water conveying pipeline; the next effect fresh water flash tanks are connected in an effect-by-effect progressive manner in the same connection mode until the last effect fresh water flash tank; the flash steam outlet of the last-effect fresh water flash tank is connected with the steam side space of the tail end condenser, and the fresh water outlet of the last-effect fresh water flash tank and the condensed water outlet of the condenser are connected with the fresh water pump by adopting a three-way pipeline.
When the concurrent feeding of the vertical tube climbing-film evaporators is realized, a concentrated seawater leading-out pipe with a structure of a right-angle elbow is arranged at the outlet of the downcomer of each vertical tube climbing-film evaporator, and the elbow part vertically and upwards extends into the lower end of the downcomer for a certain distance to receive concentrated seawater converged by the downcomer.
The vertical pipe climbing-film evaporator is basically configured into three effects and is adjusted into two effects or four effects according to the water making load requirement.
The utility model has the advantages that: the secondary steam of the last effect standpipe climbing film evaporator is extracted by adopting a thermal steam compressor, so that the heat load of the condenser is reduced, and the heat extraction loss of the condenser and the heat exchange area of the condenser are reduced; meanwhile, the secondary steam extracted by the thermal steam compressor is heated and pressurized to serve as first-effect heating steam, so that the energy loss of direct temperature and pressure reduction is reduced, the flow of working steam is reduced, and the water making ratio is increased; the seawater is preheated by two stages by using the condensed water and part of the secondary steam of the first-effect vertical tube climbing-film evaporator, the seawater temperature is raised, and the preheating quantity of the first-effect evaporator is reduced, so that the consumption of heating steam is reduced, and the water making ratio is increased.
Drawings
FIG. 1 is a diagram of a two-stage pre-heating thermal vapor compression type triple-effect standpipe climbing film evaporation seawater desalination device.
FIG. 2 is a diagram of a two-stage pre-heating thermodynamic steam compression two-effect standpipe climbing film evaporation sea water desalination device.
FIG. 3 is a diagram of a two-stage pre-heating thermal vapor compression type four-effect standpipe climbing film evaporation seawater desalination device.
In the figure: 1. the system comprises a first-effect vertical pipe climbing-film evaporator, a second-effect vertical pipe climbing-film evaporator, a third-effect vertical pipe climbing-film evaporator, a water-spraying desuperheater, a thermal steam compressor, a 6, a feed seawater pump, a 7, a condenser, a 8, a first-stage preheater, a 9, a second-stage preheater, a 10, a second-effect fresh water flash tank, a 11, a third-effect fresh water flash tank, a 12, a fresh water pump, a 13, a concentrated brine pump, a 14, an evaporation pipe bundle, a 15, a downcomer, a 16, a concentrated seawater outlet pipe, a 17, a demister, a 18, a four-effect fresh water flash tank, a 19 and a fourth-effect vertical pipe climbing-.
Detailed Description
The technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
The utility model provides a thermal power steam compression standpipe lift membrane evaporation sea water desalination device's that doublestage preheats basic configuration is triple effect, can be according to making water load demand adjustment for double effect or quadruple effect. Because the vertical tube climbing film evaporator has better heat transfer stability under the heat transfer temperature difference of 5-15 ℃, in a multi-effect vertical tube climbing film evaporation seawater desalination system, the temperature difference between effects is not lower than 5 ℃, meanwhile, because the first-effect vertical tube climbing film evaporator has a preheating section, the first-effect temperature difference accounts for a large proportion, and in order to prevent scaling, the effect number of the vertical tube climbing film evaporator of the double-stage preheating thermodynamic steam compression type vertical tube climbing film evaporation seawater desalination device is not higher than four effects under the limitation of the top temperature of salt water; due to the flow design of double-stage preheating, the lowest efficiency of the vertical tube climbing-film evaporator is double-effect.
Fig. 1 shows a diagram of a two-stage preheated thermodynamic vapor compression type triple-effect riser lift-membrane evaporation seawater desalination plant.
The triple-effect vertical-tube climbing-film evaporation seawater desalination device comprises a first-effect vertical-tube climbing-film evaporator 1, a second-effect vertical-tube climbing-film evaporator 2, a third-effect vertical-tube climbing-film evaporator 3, a water spraying desuperheater 4, a thermal steam compressor 5, a condenser 7, a first-stage preheater 8, a second-stage preheater 9, a double-effect fresh water flash tank 10, a triple-effect fresh water flash tank 11, a feeding sea water pump 6, a fresh water pump 12 and a concentrated sea water pump 13, wherein the devices are connected through pipelines. Each vertical tube climbing film evaporator is a cylindrical shell-and-tube heat exchanger, and an evaporation tube bundle 14, a downcomer 15, a concentrated seawater outlet tube 16 and a demister 17 are mainly arranged in the vertical tube climbing film evaporator. According to the basic configuration, a first-effect vertical tube climbing-film evaporator 1, a second-effect vertical tube climbing-film evaporator 2 and a third-effect vertical tube climbing-film evaporator 3 are connected in a downstream feeding mode, in order to avoid short circuit of flow of inlet and outlet seawater in a lower tube box of the vertical tube climbing-film evaporator, a concentrated seawater lead-out pipe 16 is arranged at an outlet of a descending tube 15 of the vertical tube climbing-film evaporator, the structure of the concentrated seawater lead-out pipe is a right-angle elbow, and an elbow part vertically extends upwards into the lower end of the descending tube 15 for a certain distance to receive concentrated seawater converged. According to the design, a concentrated seawater outlet pipe 16 arranged at the outlet of a descending pipe 15 in a lower pipe box in the first-effect vertical pipe climbing-film evaporator 1 is connected with a seawater inlet pipe of a lower pipe box of the second-effect vertical pipe climbing-film evaporator 2, a concentrated seawater outlet pipe of the lower pipe box of the second-effect vertical pipe climbing-film evaporator 2 is connected with a seawater inlet pipe of a lower pipe box of the third-effect vertical pipe climbing-film evaporator 3, the feed seawater flows automatically step by step under the action of each effect pressure difference, and the concentrated seawater is led to a concentrated brine pump 13 and is discharged from a device through a concentrated seawater outlet pipe at a last-effect vertical pipe climbing-film evaporator, namely the basically configured. The upper pipe box of the first-effect vertical pipe climbing-film evaporator 1 is provided with two steam outlets, one steam outlet is connected with the second-stage preheater 9, part of secondary steam of the first-effect vertical pipe climbing-film evaporator 1 is used as a heating heat source of the second-stage preheater 9, the other steam outlet is connected with a heating steam inlet of the shell pass of the second-effect vertical pipe climbing-film evaporator 2 and is used as a heating heat source of the second-effect vertical pipe climbing-film evaporator 2, and a demister 17 is arranged at the upper part of an evaporation pipe bundle 14 of the vertical pipe climbing-film evaporator to remove seawater droplets carried in the secondary steam; the intermediate-effect vertical-tube climbing-film evaporator, namely the basically configured upper tube box of the second-effect vertical-tube evaporator 2 is provided with a steam outlet which is connected with a heating steam inlet of the shell pass of the next-effect vertical-tube climbing-film evaporator 3, namely the third-effect vertical-tube climbing-film evaporator, and is used as a heating heat source of the third-effect vertical-tube climbing-film evaporator 3; the last effect standpipe climbing film evaporator, namely the third effect standpipe climbing film evaporator 3 that is basically configured, is provided with 2 steam outlets on the channel, one steam outlet is connected with the inlet of the suction chamber of the thermal power steam compressor 5, a part of secondary steam is used as the working steam for injecting steam to be sucked by the thermal power steam compressor 5, after being boosted and heated, the secondary steam is used as the heat source of the first effect standpipe climbing film evaporator 1, the other steam outlet is connected with the condenser 7, the residual secondary steam is converged into the condenser 7 to be condensed by the feed seawater, the condensation latent heat is released, and the temperature is raised for the feed seawater.
The two-stage preheating thermal power steam compression type vertical tube climbing film evaporation seawater desalination device is provided with a two-stage preheater, a first-stage preheater 8 is connected with a seawater outlet of a condenser 7 through a seawater conveying pipeline, a three-way pipe is adopted for the seawater conveying pipeline connecting the first-stage preheater 8 and the condenser 7, only part of fed seawater enters the first-stage preheater 8, the rest is discharged as cooling seawater, a hot fluid inlet of the first-stage preheater 8 is connected with a condensate water outlet of a shell side of a first-effect vertical tube climbing film evaporator 1, and steam condensate water of the first-effect vertical tube climbing film evaporator 1 is used as a heating heat source for one-stage preheating; a feed seawater inlet of the secondary preheater 9 is connected with a seawater outlet of the primary preheater 8, a hot fluid inlet of the secondary preheater is connected with a preheating steam outlet of an upper pipe box of the first-effect vertical pipe climbing-film evaporator 1, and part of secondary steam of the first-effect vertical pipe climbing-film evaporator 1 is used as a heating heat source of the secondary preheater 9 for secondary preheating; the seawater outlet of the second-stage preheater 9 is connected with the feeding seawater inlet of the lower tube box of the first-effect vertical tube climbing-film evaporator 1, and the feeding seawater preheated by the two stages enters the first-effect vertical tube climbing-film evaporator 1 for gushing boiling evaporation.
The double-stage preheated thermal power steam compression type standpipe climbing film evaporation seawater desalination device is provided with a thermal power steam compressor 5, a working nozzle of the thermal power steam compressor adopts a Laval nozzle, so that high-pressure working steam forms supersonic flow in a suction chamber, a low-pressure vacuum area is generated, secondary steam of a third-effect standpipe climbing film evaporator 3 is basically configured in a last effect of suction, and an inlet of the suction chamber is connected with a secondary steam outlet of the third-effect standpipe climbing film evaporator 3; a mixed steam outlet of the thermal steam compressor 5 is provided with a water spray desuperheater 4, a desuperheating water inlet of the water spray desuperheater 4 is connected with a condensed water eduction tube of the first-effect vertical-tube climbing-film evaporator 1, the superheated steam at the outlet of the thermal steam compressor 5 is desuperheated to saturated steam, and meanwhile, the heating steam flow of the first-effect vertical-tube climbing-film evaporator 1 is increased; an outlet of the water spray desuperheater 4 is connected with a heating steam inlet of the shell pass of the first-effect vertical tube climbing-film evaporator 1 to provide a heating heat source for the first-effect vertical tube climbing-film evaporator 1. The first effect heating steam temperature should be controlled below 80 ℃ to avoid scaling problem on the seawater side of the evaporator. In order to enable the seawater desalination device to operate efficiently, saturated or superheated steam with the pressure of more than 0.3MPa is generally adopted as working steam, and when the steam pressure is lower than 0.3MPa, the injection performance of the thermal steam compressor 5 is lower, so that the effect of improving the water making ratio of the whole seawater desalination device is not obvious.
According to the basic configuration, a double-stage preheating thermal power steam compression type vertical tube climbing film evaporation seawater desalination device is provided with a secondary fresh water flash tank 10 and a tertiary fresh water flash tank 11, a condensate outlet of a secondary preheater 9 and a condensate outlet of a secondary vertical tube climbing film evaporator 2 are respectively connected with 2 fresh water inlets of the secondary fresh water flash tank 10, a flash steam outlet of the secondary fresh water flash tank 10 is connected with a shell side space of a next effect, namely a third effect vertical tube climbing film evaporator 3, due to the existence of inter-effect pressure difference, partial flash evaporation can occur after fresh water enters the flash tank, the flash steam enters the shell side of the next effect vertical tube climbing film evaporator to serve as heating steam, and a fresh water outlet of the secondary fresh water flash tank 10 is connected with a fresh water inlet of the next effect fresh water flash tank, namely the tertiary fresh; because the triple-effect fresh water flash tank 11 is a final-effect fresh water flash tank and a next-effect vertical-tube climbing film evaporator is not arranged behind the final-effect fresh water flash tank, a flash steam outlet of the triple-effect fresh water flash tank 11 is connected with a steam side space of the tail end condenser 7 and condensed into fresh water by seawater entering the condenser 7, and a fresh water outlet of the triple-effect fresh water flash tank 11 and a condensed water outlet of the condenser 7 are connected with the fresh water pump 12 by adopting a three-way pipeline to output product water for the device. The condensate outlet pipe of the primary preheater 8 is separately arranged to separately return fresh water to the steam generating device, and the excess part is used as product water.
Fig. 2 shows a diagram of a two-stage pre-heating thermodynamic vapor compression type two-effect standpipe climbing film evaporation seawater desalination device. When the second effect is implemented, the second effect vertical pipe climbing film evaporator is an end effect evaporator, only one second effect fresh water flash evaporation tank is needed, and the rest configurations are the same as those of the three-effect system. The secondary steam injected by the thermal steam compressor 5 comes from the last effect, namely the second-effect vertical-tube climbing-film evaporator, and 2 secondary steam outlets are required to be formed in the upper tube box of the second-effect vertical-tube climbing-film evaporator. Because the next effect vertical pipe climbing film evaporator is not arranged behind the two-effect fresh water flash tank, the flash steam outlet of the fresh water flash tank is directly connected with the steam side space of the tail end condenser.
Fig. 3 shows a diagram of a two-stage pre-heating thermodynamic vapor compression type four-effect standpipe climbing film evaporation sea water desalination device.
In the four-effect implementation, a fourth-effect vertical-tube climbing-film evaporator 19 and a four-effect fresh water flash tank 18 are added on a basic configuration three-effect system, the fourth-effect vertical-tube climbing-film evaporator 19 is an end-effect evaporator, and the rest configurations are the same as the three-effect system. The secondary steam injected by the thermal steam compressor 5 comes from the last effect, namely the fourth-effect vertical-tube climbing- film evaporator 19, and 2 secondary steam outlets are required to be arranged on the upper tube box of the fourth-effect vertical-tube climbing-film evaporator 19. Since the four-effect fresh water flash tank 18 is a last-effect fresh water flash tank, the flash steam outlet of the fresh water flash tank is directly connected with the steam side space of the tail end condenser.
Claims (3)
1. A double-stage preheating thermodynamic vapor compression type vertical-tube climbing-film evaporation seawater desalination device comprises a vertical-tube climbing-film evaporator, a condenser (7), a feed seawater pump (6), a fresh water pump (12) and a strong brine pump (13), wherein the devices are connected by pipelines; the vertical tube climbing film evaporator is a cylindrical shell-and-tube heat exchanger, and is internally provided with an evaporation tube bundle (14), a downcomer (15), a concentrated seawater outlet pipe (16) and a demister (17); the method is characterized in that: the desalting device also comprises a thermal steam compressor (5), a water spray desuperheater (4), a first-stage preheater (8), a second-stage preheater (9) and a fresh water flash tank, wherein the multiple-effect vertical tube climbing-film evaporators are connected in a downstream feeding mode, the two-stage preheater is arranged at the front end of the first-effect vertical tube climbing-film evaporator, the first-effect vertical tube climbing-film evaporator is used for preheating seawater by using steam condensate water and part of secondary steam of the first-effect vertical tube climbing-film evaporator as feeding materials, and the thermal steam compressor (5) is used for pumping part of the secondary steam of the last-effect vertical; a concentrated seawater outlet pipe (16) of the lower tube box of each vertical tube climbing-film evaporator is connected with a seawater inlet pipe of the lower tube box of the next vertical tube climbing-film evaporator, and the concentrated seawater is sequentially fed and connected downstream until the concentrated seawater of the last vertical tube climbing-film evaporator is discharged out of the device through the concentrated seawater outlet pipe (16) and a concentrated brine pump (13); the upper pipe box of the first-effect vertical pipe climbing-film evaporator is provided with two steam outlets, one steam outlet is connected with the second-stage preheater (9), and the other steam outlet is connected with a heating steam inlet of the shell pass of the next-effect vertical pipe climbing-film evaporator;
the upper pipe box of the intermediate-effect vertical pipe climbing-film evaporator is provided with a steam outlet which is connected with a heating steam inlet of the shell pass of the next-effect vertical pipe climbing-film evaporator; the upper pipe box of the last effect vertical pipe climbing film evaporator is provided with 2 steam outlets, one steam outlet is connected with the inlet of the suction chamber of the thermal power steam compressor (5), and the other steam outlet is connected with the condenser (7);
the primary preheater (8) is connected with a seawater outlet of the condenser (7) through a seawater conveying pipeline, the seawater conveying pipeline connecting the primary preheater (8) and the condenser (7) adopts a three-way pipe, only part of fed seawater enters the primary preheater (8), the rest is discharged as cooling seawater, and a hot fluid inlet of the primary preheater (8) is connected with a condensed water outlet of a shell side of the first-effect vertical tube climbing film evaporator; a feed seawater inlet of the secondary preheater (9) is connected with a seawater outlet of the primary preheater (8), a hot fluid inlet of the secondary preheater is connected with a preheated steam outlet of an upper tube box of the first-effect vertical tube climbing film evaporator, and a seawater outlet of the secondary preheater (9) is connected with a feed seawater inlet of a lower tube box of the first-effect vertical tube climbing film evaporator;
a working nozzle of the thermal power steam compressor (5) adopts a Laval nozzle, an inlet of a suction chamber of the Laval nozzle is connected with a secondary steam outlet of the last-effect vertical tube climbing film evaporator, a mixed steam outlet of the thermal power steam compressor (5) is provided with a water spray desuperheater (4), a desuperheating water inlet of the water spray desuperheater (4) is connected with a condensed water outlet pipe of the first-effect vertical tube climbing film evaporator, and an outlet of the water spray desuperheater (4) is connected with a heating steam inlet of a shell pass of the first-effect vertical tube climbing film evaporator;
the condensate water outlet of the secondary preheater (9) and the condensate water outlet of the second-effect vertical-tube climbing-film evaporator are respectively connected with 2 fresh water inlets of the second-effect fresh water flash tank (10), the flash steam outlet of the second-effect fresh water flash tank (10) is connected with the shell-side space of the next-effect vertical-tube climbing-film evaporator, and the fresh water outlet of the second-effect fresh water flash tank (10) is connected with the fresh water inlet of the next-effect fresh water flash tank by a fresh water conveying pipeline; the next effect fresh water flash tanks are connected in an effect-by-effect progressive manner in the same connection mode until the last effect fresh water flash tank; the flash steam outlet of the last-effect fresh water flash tank is connected with the steam side space of the tail end condenser (7), and the fresh water outlet of the last-effect fresh water flash tank is connected with the condensed water outlet of the condenser (7) by a tee pipeline and a fresh water pump (12).
2. The two-stage preheated thermodynamic steam compression type standpipe climbing film evaporation sea water desalination device of claim 1, characterized in that: when the concurrent feeding of the vertical tube climbing film evaporators is realized, a concentrated seawater outlet pipe (16) which is a right-angle elbow pipe in structure is arranged at the outlet of the downcomer (15) of each vertical tube climbing film evaporator, and the elbow part vertically and upwards extends into the lower end of the downcomer (15) for a certain distance to receive concentrated seawater converged by the downcomer (15).
3. The two-stage preheated thermodynamic steam compression type standpipe climbing film evaporation sea water desalination device of claim 1, characterized in that: the vertical pipe climbing-film evaporator is basically configured into three effects and is adjusted into two effects or four effects according to the water making load requirement.
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