CN103073142A - Multiple-effect-group, low-temperature and multiple-effect distilled seawater desalination system - Google Patents
Multiple-effect-group, low-temperature and multiple-effect distilled seawater desalination system Download PDFInfo
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- CN103073142A CN103073142A CN2013100113382A CN201310011338A CN103073142A CN 103073142 A CN103073142 A CN 103073142A CN 2013100113382 A CN2013100113382 A CN 2013100113382A CN 201310011338 A CN201310011338 A CN 201310011338A CN 103073142 A CN103073142 A CN 103073142A
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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
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- Y02A20/124—Water desalination
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Abstract
The invention relates to the technical field of seawater desalination, in particular to a multiple-effect-group, low-temperature and multiple-effect distilled seawater desalination system which is used for improving the steam utilization rate and further improving the performance ratio of the system. The multiple-effect-group, low-temperature and multiple-effect distilled seawater desalination system comprises a falling film condenser, a mandatory condenser and at least two groups of evaporation groups connected with the falling film condenser in series and comprising at least ten effect series evaporators, a steam pipeline, a feed seawater pipeline, a concentrated seawater discharge pipeline, a product water discharge pipeline, a concentrated seawater delivery pipeline, a seawater countercurrent delivery pipeline, a discharge pipeline and a condensed water discharge pipeline connecting a material seawater source, a material steam source, the effect evaporators with the condensers and control valves which are arranged on the pipelines.
Description
Technical field
The present invention relates to field of sea water desalting technology, particularly a kind of low temperature multiple-effect distillation seawater desalination system of multiple-effect group.
Background technology
The low temperature multiple-effect distillation sea water desalting technology refers to that the high evaporation temperature of seawater generally is lower than 70 ℃ desalination techniques, low temperature multiple-effect distillation seawater desalination system is with a series of evaporator series, pass through repeatedly with evaporation of seawater with a certain amount of steam input, and by gas cold the congeal into water of seawater with evaporation, circulating direction along steam, vaporization temperature and the pressure of a next effect all are lower than front one effect, thereby obtain being multiple times than the desalination process of the distilled water of quantity of steam.
The essence of low temperature multiple-effect distillation sea water desalting technology is to exchange resource for the energy, and steam cost accounting in the sea water desaltination water producing cost is maximum.The low temperature multiple-effect distillation seawater desalination system of existing multiple-effect group, steam utilization is lower, and the water generation ratio of the whole system ratio of the quantity of steam that consumes (system's fresh water ultimate production with) is lower.
Summary of the invention
The object of the present invention is to provide a kind of low temperature multiple-effect distillation seawater desalination system of multiple-effect group, be used for the water generation ratio of raising system.
To achieve these goals, the invention provides following technical scheme:
A kind of low temperature multiple-effect distillation seawater desalination system of multiple-effect group comprises:
The falling liquid film condenser that is communicated with described raw material seawater source;
The steam-pipe that is communicated with described raw material vapour source, and be arranged on heat pump on the steam-pipe;
The evaporation group that at least two groups are connected with described falling liquid film condenser, and described at least two group evaporation groups comprise at least ten effect cascade evaporation devices, wherein, the evaporation group that is communicated with the seawater water outlet of described falling liquid film condenser is last evaporation group, the vaporizer that is communicated with the inlet mouth of described falling liquid film condenser in the described last evaporation group is the tail vaporizer, with evaporation group headed by the evaporation group that described steam-pipe is communicated with, in the described first evaporation group with vaporizer headed by the vaporizer that described steam-pipe is communicated with;
The forced condensation device that is communicated with described raw material seawater source and described tail vaporizer air outlet;
The discharge tube that is communicated with the water outlet of described forced condensation device;
The charging seawater pipeline that is communicated with described falling liquid film condenser and described last evaporation group;
Along last evaporation group to first evaporation prescription to the concentrated seawater transport pipe that each group evaporation group is together in series;
Respectively with the seawater water outlet of each group evaporation group and the concentrated seawater reflux line of seawater water inlet connection;
What be communicated with the air outlet of described falling liquid film condenser, forced condensation device and first vaporizer takes out the non-condensable gas device;
The concentrated seawater discharge tube that is communicated with described first vaporizer seawater water outlet, and be arranged on concentrated seawater surge tank on the described concentrated seawater discharge tube;
The condensed water elimination pipeline that is communicated with described first evaporator condensation water water outlet, and be arranged on water of condensation surge tank on the described condensed water elimination pipeline;
With the described product water discharge tube that the product water water outlet of each single-effect evaporator product water water outlet and forced condensation device and falling liquid film condenser is communicated with except first vaporizer, and be arranged on fresh water surge tank on the product water discharge tube.
Preferably, described vaporizer is shell and tube evaporator, and described shell and tube evaporator comprises housing and is arranged on the interior heat exchange bundle of housing.
Preferably, described housing is the carbon steel shell with rotproofing layer, and described heat exchange bundle is aluminium alloy heat exchange bundle.
Preferably, described rotproofing layer is epoxy resin layer.
Preferably, described heat pump is the thermo compression injector.
Preferably, described heat pump also is communicated with the air outlet of any one vaporizer except first vaporizer.
Preferably, outside except first vaporizer and tail vaporizer, the respectively corresponding fresh water flash tank of all the other each single-effect evaporators, and described fresh water flash tank is connected on the described product water discharge tube.
Preferably, except first vaporizer, all the other each respectively corresponding concentrated seawater flash tank of vaporizers, the air outlet of described each concentrated seawater flash tank are communicated with the air outlet of corresponding vaporizer respectively, and described concentrated seawater flash tank is connected on the described concentrated seawater discharge tube.
Better, the low temperature multiple-effect distillation seawater desalination system of described multiple-effect group also comprises:
Be separately positioned on described each bar concentrated seawater transport pipe and the middle charge pump on the concentrated seawater reflux line of the first evaporation group seawater water inlet of connection and seawater water outlet;
Be arranged on the pan feeding sea-water pump on the described charging seawater pipeline;
Be arranged on the condensate pump on the described condensed water elimination pipeline;
Be arranged on the fresh water pump on the described product water discharge tube;
Be arranged on the concentrated seawater pump on the described concentrated seawater discharge tube.
Better, the low temperature multiple-effect distillation seawater desalination system of described multiple-effect group also comprises:
With the input terminus of concentrated seawater discharge tube and the concentrated seawater counter-flow duct of output terminal connection; And,
Be arranged on the water of condensation interchanger on condensed water elimination pipeline and the concentrated seawater counter-flow duct;
Be arranged on the concentrated seawater interchanger on concentrated seawater discharge tube and the falling liquid film condenser seawater ingress pipeline;
Be arranged on the product water interchanger on the pipeline of product water discharge tube and falling liquid film condenser seawater water inlet.
The low temperature multiple-effect distillation seawater desalination system of multiple-effect group provided by the invention comprises: the evaporation group that at least two groups are connected with described falling liquid film condenser, and described at least two group evaporation groups comprise at least ten effect cascade evaporation devices.During use, raw material seawater preheating in the falling liquid film condenser, the raw material seawater after the preheating enters in each single-effect evaporator shell in the last evaporation group; Raw material steam enters behind heat pump in the first heat exchange pipe of evaporator bundle in the first evaporation group, carries out heat exchange with the seawater that enters in this vaporizer shell, discharges system by the condensed water elimination pipeline behind the vapor condensation; A seawater part that enters this vaporizer becomes secondary steam and enters in the lower 1st effective evaporator heat-exchanging tube bundle that is adjacent, and further is full of each single-effect evaporator.The order of raw material seawater along end evaporation group to first evaporation group that enters into afterwards system evaporated successively, concentrated, and in each evaporation group, again be back in each evaporation group by the concentrated seawater reflux line, again concentrate, increased the flow process of seawater in system, the secondary steam that produces in each evaporation group generates product water and discharges system by the product water discharge tube after by the seawater condensing in each evaporation group.Because native system can arrange the vaporizer of at least ten effects, and in each evaporation group, be provided with the concentrated seawater reflux line, therefore, the flow process of seawater in system significantly increased, and the secondary steam that evaporation of seawater produces can be become product water by seawater condensing fully.Therefore, compared with prior art, when utilizing the low temperature multiple-effect distillation seawater desalination system processing seawater of multiple-effect group provided by the invention, can take full advantage of steam, improve the water generation ratio of system.
Description of drawings
The structural representation of the low temperature multiple-effect distillation seawater desalination system of a kind of multiple-effect group that Fig. 1 provides for the embodiment of the invention.
Reference numeral:
1～14: vaporizer; 15: the falling liquid film condenser; 16: the forced condensation device;
17: heat pump; 18: take out the non-condensable gas device; 19: the concentrated seawater interchanger;
20: the product water interchanger; 21: the water of condensation interchanger; 22 ~ 34: the concentrated seawater flash tank;
35: the concentrated seawater surge tank; 36 ~ 47: the fresh water flash tank; 48: the fresh water surge tank;
49: the water of condensation surge tank; 50: the concentrated seawater pump; 51: fresh water pump;
52: condensate pump; 53: the pan feeding sea-water pump; 54～62: middle charge pump;
63: the raw material vapour source; 64: discharge tube; 65: the raw material seawater source;
66: the concentrated seawater discharge tube; 67: the product water discharge tube; 68: the condensed water elimination pipeline;
69: steam-pipe; 70: the concentrated seawater transport pipe; 71: the concentrated seawater reflux line;
72: the concentrated seawater counter-flow duct; 73: the charging seawater pipeline.
Embodiment
The low temperature multiple-effect distillation seawater desalination system of existing multiple-effect group is when desalinating processing to seawater, steam utilization is low, thereby so that the water generation ratio of system is lower.
In view of this, the invention provides a kind of improved technical scheme, by in the low temperature multiple-effect distillation seawater desalination system of multiple-effect group, increasing the effect number of vaporizer, and between each group evaporation group, set up the concentrated seawater reflux line, and make the seawater after in system, being heated repeatedly flow through vaporizer, increased the flow process of seawater, seawater is further evaporated, produce more steam, simultaneously, the steam of generation with seawater to make heat exchange after be condensed into product water; Therefore, adopt the low temperature multiple-effect distillation seawater desalination system of multiple-effect group provided by the invention, can improve the utilization ratio of steam, thereby improve the water generation ratio of system.
In order to make those skilled in the art better understand technical scheme of the present invention, below in conjunction with Figure of description the embodiment of the invention is described in detail.
As shown in Figure 1, the invention provides a kind of low temperature multiple-effect distillation seawater desalination system of multiple-effect group, comprising:
The falling liquid film condenser 15 that is communicated with described raw material seawater source 65;
The steam-pipe 69 that is communicated with described raw material vapour source 63, and be arranged on heat pump 17 on the steam-pipe 69;
The evaporation group that at least two groups are connected with described falling liquid film condenser 15, and described at least two group evaporation groups comprise at least ten effect cascade evaporation devices, wherein, the evaporation group that is communicated with the seawater water outlet of described falling liquid film condenser 15 is last evaporation group, the vaporizer that is communicated with the inlet mouth of described falling liquid film condenser 15 in the described last evaporation group is the tail vaporizer, with evaporation group headed by the evaporation group that described steam-pipe 69 is communicated with, in the described first evaporation group with vaporizer headed by the vaporizer that described steam-pipe 69 is communicated with;
The forced condensation device 16 that is communicated with described raw material seawater source 65 and described tail vaporizer air outlet;
The discharge tube 64 that is communicated with the water outlet of described forced condensation device 16;
The charging seawater pipeline 73 that is communicated with described falling liquid film condenser 15 and described last evaporation group;
Along last evaporation group to first evaporation prescription to the concentrated seawater transport pipe 70 that each group evaporation group is together in series;
Respectively with the seawater water outlet of each group evaporation group and the concentrated seawater reflux line 71 of seawater water inlet connection;
What be communicated with the air outlet of described falling liquid film condenser 15, forced condensation device 16 and first vaporizer takes out non-condensable gas device 18;
The concentrated seawater discharge tube 66 that is communicated with described first vaporizer seawater water outlet, and be arranged on concentrated seawater surge tank 35 on the described concentrated seawater discharge tube 66;
The condensed water elimination pipeline 68 that is communicated with described first evaporator condensation water water outlet, and be arranged on water of condensation surge tank 49 on the described condensed water elimination pipeline 68;
With the described product water discharge tube 67 that the product water water outlet of each single-effect evaporator product water water outlet and forced condensation device 16 and falling liquid film condenser 15 is communicated with except first vaporizer, be arranged on the fresh water surge tank 48 on the product water discharge tube 67.
Utilize the low temperature multiple-effect distillation seawater desalination system of the multiple-effect group of the multiple-effect group that the embodiment of the invention provides to process the working process of seawater as follows:
First-selection after 15 preheatings of raw material seawater process falling liquid film condenser, enters into last evaporation group, and is full of successively in the shell of the vaporizer in each evaporation group.
Raw material steam through enter behind the heat pump 17 in the first evaporation group with first vaporizer that steam-pipe 69 is communicated with in, carry out heat exchange with the raw material seawater in this vaporizer, raw material vapor condensation after the heat exchange becomes product water, product water water outlet by this vaporizer is discharged in the product water discharge tube 67, raw material seawater in this vaporizer forms secondary steam after heat exchange, secondary steam is full of each single-effect evaporator successively, and carry out heat exchange with seawater in each single-effect evaporator, the product water water outlet of the product water that forms after the secondary steam heat exchange by each single-effect evaporator is pooled to the interior discharge of product water discharge tube 67 system, because secondary steam is continuous and seawater carries out heat exchange, so the temperature and pressure of the secondary steam in along first evaporation group to last evaporation group reduces successively.Seawater and secondary steam heat exchange in each evaporation group, a part of seawater after concentrated is by concentrated seawater counter-flow duct 72, be back in this evaporation group, mix with the concentrated seawater in entering into this evaporation group, improved the temperature that enters the concentrated seawater in this evaporation group, dwindled should the evaporation group in the temperature difference of concentrated seawater and secondary steam, make concentrated seawater after absorbing less heat, just can produce secondary steam, increased the generation of secondary steam in the system.Concentrated seawater after finally being concentrated by concentrated seawater by being arranged on the concentrated seawater interchanger 19 on the concentrated seawater pipeline, with concentrated seawater with enter into intrasystem raw material seawater and carry out heat exchange.Secondary steam part in the vaporizer enters into falling liquid film condenser 15 and is used for raw material seawater is carried out preheating, and the product water that forms after the secondary steam condensation enters in the product water discharge tube 67; Another part enters into forced condensation device 16, secondary steam further is condensed into product water, each evaporation group all adopts the liquid level control mode to control the interior liquid level of each evaporation group, and each discharge tube is all adjusted by the surge tank that is arranged on each discharge tube.
The low temperature multiple-effect distillation seawater desalination system of the multiple-effect group that the embodiment of the invention provides, by at least ten single-effect evaporators are set, and be arranged on concentrated seawater reflux line 71 on each evaporation group, can increase seawater in intrasystem flow process, be that seawater not only circulates along vaporizer in system successively, also mix the step evaporation of going forward side by side by concentrated seawater reflux line 71 with concentrated seawater in entering into each evaporation group, concentrated, not only improved seawater in intrasystem flow process, improved simultaneously the temperature that enters the concentrated seawater in this evaporation group, dwindled should the evaporation group in the temperature difference of concentrated seawater and secondary steam, make concentrated seawater after absorbing less heat, just can produce secondary steam, increased the generation of secondary steam in the system.Simultaneously, because native system, adopt at least ten effect evaporation groups, the secondary steam that evaporation of seawater is gone out can access sufficient condensation, remaining secondary steam can also pass through falling liquid film condenser 15 and the 16 further condensations of forced condensation device in the last evaporator, so that the secondary steam that seawater produces can change into product water to greatest extent.Therefore, native system improves the utilization ratio of steam, thereby improves the water generation ratio of system.
The below is to comprise nine evaporation groups as example, the low temperature multiple-effect distillation seawater desalination system of the multiple-effect group that the embodiment of the invention of further explaining provides.
Continuation is with reference to figure 1, and low temperature multiple-effect distillation seawater desalination system comprises: the vaporizer 1 of series connection, vaporizer 2, vaporizer 3, vaporizer 4, vaporizer 5, vaporizer 6, vaporizer 7, vaporizer 8, vaporizer 9, vaporizer 10, vaporizer 11, vaporizer 12, vaporizer 13 and vaporizer 14.Wherein, evaporation group headed by the vaporizer 1, vaporizer 2 is the second evaporation group, vaporizer 3 is the 3rd evaporation group, and vaporizer 4 is the 4th evaporation group, and vaporizer 5 and vaporizer 6 are the 5th evaporation group, vaporizer 7 and vaporizer 8 are the 6th evaporation group, vaporizer 9 and vaporizer 10 are the 7th evaporation group, and vaporizer 11 and vaporizer 12 are the 8th evaporation group, and vaporizer 13 and vaporizer 14 are last evaporation group; The falling liquid film condenser 15 that is communicated with described raw material seawater source 65; The steam-pipe 69 that is communicated with described raw material vapour source 63, and be arranged on heat pump 17 on the steam-pipe 69; The forced condensation device 16 that is communicated with described raw material seawater source 65 and described tail vaporizer air outlet; The charging seawater pipeline 73 that is communicated with described falling liquid film condenser 15 and described last evaporation group; Along last evaporation group to first evaporation prescription to the concentrated seawater transport pipe 70 that each group evaporation group is together in series; Respectively with the seawater water outlet of each group evaporation group and the concentrated seawater reflux line 71 of seawater water inlet connection; What be communicated with the air outlet of described falling liquid film condenser 15, forced condensation device 16 and first vaporizer takes out non-condensable gas device 18; The concentrated seawater discharge tube 66 that is communicated with described first vaporizer seawater water outlet, and be arranged on concentrated seawater surge tank 35 on the described concentrated seawater discharge tube 66; The condensed water elimination pipeline 68 that is communicated with described first evaporator condensation water water outlet, and be arranged on water of condensation surge tank 49 on the described condensed water elimination pipeline 68; With the described product water discharge tube 67 that the product water water outlet of each single-effect evaporator product water water outlet and forced condensation device 16 and falling liquid film condenser 15 is communicated with except first vaporizer, be arranged on the fresh water surge tank 48 on the product water discharge tube 67, the discharge tube 64 that is communicated with the water outlet of described forced condensation device 16.Wherein,
The water-in of falling liquid film condenser 15 and raw material seawater source 65 are connected, the water outlet of falling liquid film condenser 15 is communicated with by the vaporizer 14 in charging seawater pipeline 73 and the last evaporation group and the water-in of vaporizer 13, the product water water outlet of falling liquid film condenser 15 is communicated with product water discharge tube 67, and the inlet mouth of falling liquid film condenser 15 is communicated with the air outlet of vaporizer 14;
The water-in of forced condensation device 16 is communicated with raw material seawater source 65, the water-in of forced condensation device 16 is communicated with discharge tube 64, the inlet mouth of forced condensation device 16 is communicated with vaporizer 14, and the product water water outlet of forced condensation device 16 is communicated with product water discharge tube 67.
Each single-effect evaporator all adopts shell and tube evaporator, and described shell and tube evaporator comprises housing and is arranged on the interior heat exchange bundle of housing.Preferably, described housing is the carbon steel shell with rotproofing layer, and described heat exchange bundle is aluminium alloy heat exchange bundle, and wherein the rotproofing layer can be the layer of multiple rotproofing formation, and preferred, described rotproofing layer is epoxy resin layer.
Heat pump 17 is the thermo compression injector, the inlet mouth of heat pump 17 and raw material vapour source 63 and except first vaporizer the air outlet of any one vaporizer be communicated with, the air outlet of heat pump 17 is communicated with the inlet mouth of vaporizer 1.
The principle of work of the low temperature multiple-effect distillation seawater desalination system of multiple-effect group is as follows in above-described embodiment:
At first, raw material seawater enters carries out preheating in the falling liquid film condenser 15, and the raw material seawater after the preheating is full of each single-effect evaporator successively.
Raw material steam enters in the vaporizer 1 by heat pump 17, and carries out heat exchange with the raw material seawater that enters in the vaporizer 1, and the raw material vapor condensation after the heat exchange becomes water of condensation and passes through condensed water elimination pipeline 68 discharge systems.Raw material seawater is evaporated the generation secondary steam, and secondary steam is organized to the order of tail evaporation group along the head evaporation and entered successively each evaporation group, until be full of the heat exchange bundle in the vaporizer.Parallel raw material seawater and vaporizer 13 and the vaporizer 14 interior secondary steams that enter in vaporizer 14 and the vaporizer 13 carry out heat exchange afterwards, a raw material seawater part is evaporated into secondary steam, a remaining seawater part that is concentrated is transported in vaporizer 11 and the vaporizer 12 by concentrated seawater transport pipe 70, another part again is transported in vaporizer 13 and the vaporizer 14 by concentrated seawater reflux line 71 and evaporates, concentrated, the rest may be inferred, the seawater and the secondary steam that enter in each evaporation group repeatedly carry out heat exchange, until enter in the shell of vaporizer 1, a concentrated seawater part that enters in the vaporizer 1 was entered concentrated seawater discharge tube 66 discharge systems, and a part is advanced overrich seawater reflux pipeline 71 and again entered in the vaporizer 1 and evaporate, concentrated.Intrasystem secondary steam with seawater to make heat exchange after be condensed into product water and by product water discharge tube 67 discharge systems, vaporizer 14 interior remaining secondary steams enter into forced condensation device 16 and falling liquid film condenser 15, again carry out condensing heat-exchange, until all convert product water to, and by product water discharge tube 67 discharge systems.Noncondensable gas in falling liquid film condenser 15 and the forced condensation device 16 is taken out 18 extractions of non-condensable gas device and is discharged into outside the system.Liquid flow rate in condensed water elimination pipeline 68, product water discharge tube 67, the concentrated seawater discharge tube 66 is controlled by water of condensation surge tank 49, fresh water surge tank 48 and concentrated seawater surge tank 35 respectively.
Preferably, the low temperature multiple-effect distillation seawater desalination system of multiple-effect group also comprises: be communicated with described falling liquid film condenser 15 air outlets, be used for the raw material seawater that enters falling liquid film condenser 15 is carried out degassed vacuum extractor (not shown in FIG.).Vacuum extractor can be extracted non-condensable gases in the seawater out, and the non-condensable gases that prevents from being blended in the raw material seawater causes damage to the equipment of the low temperature multiple-effect distillation seawater desalination system of multiple-effect group.
Preferably, the low temperature multiple-effect distillation seawater desalination system of multiple-effect group also comprises: be separately positioned on described each bar concentrated seawater transport pipe 70 and the middle charge pump on the concentrated seawater reflux line 71 of the first evaporation group seawater water inlet of connection and seawater water outlet; Vaporizer 14 and vaporizer 13 corresponding middle charge pumps 54, vaporizer 12 and vaporizer 11 corresponding middle charge pumps 55, vaporizer 10 and vaporizer 9 corresponding middle charge pumps 56, vaporizer 8 and vaporizer 7 corresponding middle charge pumps 57, vaporizer 6 and vaporizer 5 corresponding middle charge pumps 58, vaporizer 4 corresponding middle charge pumps 59, charge pump 60 in the middle of vaporizer 3 correspondences, vaporizer 2 corresponding middle charge pumps 61, vaporizer 1 corresponding middle charge pump 62; Be arranged on the pan feeding sea-water pump 53 on the described charging seawater pipeline 73; Be arranged on the condensate pump 52 on the described condensed water elimination pipeline 68; Be arranged on the fresh water pump 51 on the described product water discharge tube 67; Be arranged on the concentrated seawater pump 50 on the described concentrated seawater discharge tube 66.Set up the pump of different purposes at each pipeline, can be convenient to the circulation of the liquid in the pipeline, improve the working efficiency of native system.
Continuation is referring to Fig. 1, in order to take full advantage of steam heat, in the low temperature multiple-effect distillation seawater desalination system of above-mentioned multiple-effect group, except first vaporizer and tail vaporizer, the respectively corresponding fresh water flash tank of all the other each single-effect evaporators, and described fresh water flash tank is connected on the described product water discharge tube 67.Each described fresh water flash tank water-in is communicated with the product water outlet of corresponding vaporizer, and all fresh water flash tanks are by described product water discharge tube 67 series connection.The inlet mouth of the vaporizer that described fresh water flash tank air outlet is adjacent with corresponding vaporizer is communicated with, and each fresh water flash tank is connected successively by described product water discharge tube 67.In the present embodiment, fresh water flash tank 36 is communicated with corresponding vaporizer 2, fresh water flash tank 37 is communicated with corresponding vaporizer 3, fresh water flash tank 38 is communicated with corresponding vaporizer 4, fresh water flash tank 39 is communicated with corresponding vaporizer 5, fresh water flash tank 40 is communicated with corresponding vaporizer 6, fresh water flash tank 41 is communicated with corresponding vaporizer 7, fresh water flash tank 42 is communicated with corresponding vaporizer 8, fresh water flash tank 43 is communicated with corresponding vaporizer 9, fresh water flash tank 44 is communicated with corresponding vaporizer 10, fresh water flash tank 45 is communicated with corresponding vaporizer 11, fresh water flash tank 46 is communicated with corresponding vaporizer 12, and fresh water flash tank 47 is communicated with corresponding vaporizer 13, and above-mentioned fresh water flash tank passes through product water discharge tube 67 and connects.The water of condensation that produces in vaporizer 2 enters fresh water flash tank 36 as product water and carries out flash distillation, and flash steam enters vaporizer 3; Finish mixing evaporator 3 produces after the heat exchange product water and enter fresh water flash tank 37 and carry out flash distillation, flash steam enters vaporizer 4, the like, after finally all product waters are pooled to fresh water flash tank 47, discharge system by the product water pump lifting.
Continuation is referring to Fig. 1, in order to take full advantage of steam heat, in the low temperature multiple-effect distillation seawater desalination system of above-mentioned multiple-effect group, except first vaporizer, the respectively corresponding concentrated seawater flash tank of all the other each vaporizers, the air outlet of described concentrated seawater flash tank is communicated with the air outlet of corresponding vaporizer respectively, and described concentrated seawater flash tank is connected on the described concentrated seawater discharge tube 66.In the present embodiment, the air outlet of concentrated seawater flash tank 22 is communicated with the air outlet of corresponding vaporizer 2, the air outlet of concentrated seawater flash tank 23 is communicated with the air outlet of corresponding vaporizer 3, the air outlet of concentrated seawater flash tank 24 is communicated with the air outlet of corresponding vaporizer 4, the air outlet of concentrated seawater flash tank 25 is communicated with the air outlet of corresponding vaporizer 5, the air outlet of concentrated seawater flash tank 26 is communicated with the air outlet of corresponding vaporizer 6, the air outlet of concentrated seawater flash tank 27 is communicated with the air outlet of corresponding vaporizer 7, the air outlet of concentrated seawater flash tank 28 is communicated with the air outlet of corresponding vaporizer 8, the air outlet of concentrated seawater flash tank 29 is communicated with the air outlet of corresponding vaporizer 9, the air outlet of concentrated seawater flash tank 30 is communicated with the air outlet of corresponding vaporizer 10, the air outlet of concentrated seawater flash tank 31 is communicated with the air outlet of corresponding vaporizer 11, the air outlet of concentrated seawater flash tank 32 is communicated with the air outlet of corresponding vaporizer 12, the air outlet of concentrated seawater flash tank 33 is communicated with the air outlet of corresponding vaporizer 13, the air outlet of concentrated seawater flash tank 34 is communicated with the air outlet of corresponding vaporizer 14, and above-mentioned concentrated seawater flash tank is by 66 series connection of concentrated seawater discharge tube.The concentrated seawater that produces in vaporizer 1 enters concentrated seawater flash tank 22 and carries out flash distillation, and flash steam enters vaporizer 2; Concentrated seawater after the flash distillation carries out flash distillation at each concentrated seawater flash tank successively, and flash steam enters the respectively vaporizer of correspondence of each concentrated seawater flash tank, and the concentrated seawater after flash distillation is complete promotes the discharge systems by concentrated seawater pump 50.
Preferably, the low temperature multiple-effect distillation seawater desalination system of above-mentioned multiple-effect group also comprises: with the input terminus of concentrated seawater discharge tube 66 and the concentrated seawater counter-flow duct 72 of output terminal connection; Be arranged on the water of condensation interchanger 21 on condensed water elimination pipeline 68 and the concentrated seawater counter-flow duct 72; Be arranged on the concentrated seawater interchanger 19 on concentrated seawater discharge tube 66 and the falling liquid film condenser 15 seawater ingress pipelines; Be arranged on the product water interchanger on the pipeline of product water discharge tube 67 and falling liquid film condenser 15 seawater water inlets.The heat that concentrated seawater interchanger 19, water of condensation interchanger 21 and product water interchanger can contain product water, concentrated seawater, the water of condensation of the system of discharge is transformed into the heat of the seawater of the system of entering into, thereby further improve energy utilization rate, reduce energy dissipation.
In sum, the low temperature multiple-effect distillation seawater desalination system of the multiple-effect group that the embodiment of the invention provides, by at least ten single-effect evaporators are set, and be arranged on concentrated seawater reflux line 71 on each evaporation group, can increase seawater in intrasystem flow process, be that seawater not only circulates along vaporizer in system successively, also by concentrated seawater reflux line 71 with enter into concentrated seawater in each evaporation group and be mixed into a step and evaporate, concentrated, not only improved seawater in intrasystem flow process, improved simultaneously the temperature that enters the concentrated seawater in this evaporation group, dwindled should the evaporation group in the temperature difference of concentrated seawater and secondary steam, make concentrated seawater after absorbing less heat, just can produce secondary steam, increased the generation of secondary steam in the system.Simultaneously, because the vaporizer of native system adopts less expensive carbon steel and aluminium alloy to make, and can further reduce the cost of system, therefore, native system can adopt the vaporizer of at least ten effects, and the secondary steam that evaporation of seawater is gone out can access sufficient condensation.Therefore, native system improves the utilization ratio of steam, thereby improves the water generation ratio of system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the low temperature multiple-effect distillation seawater desalination system of a multiple-effect group is characterized in that, comprising:
The falling liquid film condenser that is communicated with described raw material seawater source;
The steam-pipe that is communicated with described raw material vapour source, and be arranged on heat pump on the steam-pipe;
The evaporation group that at least two groups are connected with described falling liquid film condenser, and described at least two group evaporation groups comprise at least ten effect cascade evaporation devices, wherein, the evaporation group that is communicated with the seawater water outlet of described falling liquid film condenser is last evaporation group, the vaporizer that is communicated with the inlet mouth of described falling liquid film condenser in the described last evaporation group is the tail vaporizer, with evaporation group headed by the evaporation group that described steam-pipe is communicated with, in the described first evaporation group with vaporizer headed by the vaporizer that described steam-pipe is communicated with;
The forced condensation device that is communicated with described raw material seawater source and described tail vaporizer air outlet;
The discharge tube that is communicated with the water outlet of described forced condensation device;
The charging seawater pipeline that is communicated with described falling liquid film condenser and described last evaporation group;
Along last evaporation group to first evaporation prescription to the concentrated seawater transport pipe that each group evaporation group is together in series;
Respectively with the seawater water outlet of each group evaporation group and the concentrated seawater reflux line of seawater water inlet connection;
What be communicated with the air outlet of described falling liquid film condenser, forced condensation device and first vaporizer takes out the non-condensable gas device;
The concentrated seawater discharge tube that is communicated with described first vaporizer seawater water outlet, and be arranged on concentrated seawater surge tank on the described concentrated seawater discharge tube;
The condensed water elimination pipeline that is communicated with described first evaporator condensation water water outlet, and be arranged on water of condensation surge tank on the described condensed water elimination pipeline;
With the described product water discharge tube that the product water water outlet of each single-effect evaporator product water water outlet and forced condensation device and falling liquid film condenser is communicated with except first vaporizer, and be arranged on fresh water surge tank on the product water discharge tube.
2. the low temperature multiple-effect distillation seawater desalination system of multiple-effect group as claimed in claim 1 is characterized in that, described vaporizer is shell and tube evaporator, and described shell and tube evaporator comprises housing and is arranged on the interior heat exchange bundle of housing.
3. the low temperature multiple-effect distillation seawater desalination system of multiple-effect group as claimed in claim 2 is characterized in that, described housing is the carbon steel shell with rotproofing layer, and described heat exchange bundle is aluminium alloy heat exchange bundle.
4. the low temperature multiple-effect distillation seawater desalination system of multiple-effect group as claimed in claim 3 is characterized in that, described rotproofing layer is epoxy resin layer.
5. the low temperature multiple-effect distillation seawater desalination system of multiple-effect group as claimed in claim 1 is characterized in that, described heat pump is the thermo compression injector.
6. the low temperature multiple-effect distillation seawater desalination system of multiple-effect group as claimed in claim 5 is characterized in that, described heat pump also is communicated with the air outlet of any one vaporizer except first vaporizer.
7. the low temperature multiple-effect distillation seawater desalination system of multiple-effect group as claimed in claim 1, it is characterized in that, except first vaporizer and tail vaporizer, the respectively corresponding fresh water flash tank of all the other each single-effect evaporators, and described fresh water flash tank is connected on the described product water discharge tube.
8. the low temperature multiple-effect distillation seawater desalination system of multiple-effect group as claimed in claim 1, it is characterized in that, except first vaporizer, the respectively corresponding concentrated seawater flash tank of all the other each vaporizers, the air outlet of described each concentrated seawater flash tank is communicated with the air outlet of corresponding vaporizer respectively, and described concentrated seawater flash tank is connected on the described concentrated seawater discharge tube.
9. the low temperature multiple-effect distillation seawater desalination system of multiple-effect group as claimed in claim 1 is characterized in that, also comprises:
Be separately positioned on described each bar concentrated seawater transport pipe and the middle charge pump on the concentrated seawater reflux line of the first evaporation group seawater water inlet of connection and seawater water outlet;
Be arranged on the pan feeding sea-water pump on the described charging seawater pipeline;
Be arranged on the condensate pump on the described condensed water elimination pipeline;
Be arranged on the fresh water pump on the described product water discharge tube;
Be arranged on the concentrated seawater pump on the described concentrated seawater discharge tube.
10. such as the low temperature multiple-effect distillation seawater desalination system of each described multiple-effect group of claim 1 ~ 9, it is characterized in that, also comprise: with the input terminus of concentrated seawater discharge tube and the concentrated seawater counter-flow duct of output terminal connection; And,
Be arranged on the water of condensation interchanger on condensed water elimination pipeline and the concentrated seawater counter-flow duct;
Be arranged on the concentrated seawater interchanger on concentrated seawater discharge tube and the falling liquid film condenser seawater ingress pipeline;
Be arranged on the product water interchanger on the pipeline of product water discharge tube and falling liquid film condenser seawater water inlet.
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| CN2013100113382A CN103073142A (en) | 2013-01-11 | 2013-01-11 | Multiple-effect-group, low-temperature and multiple-effect distilled seawater desalination system |
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| CN2013100113382A CN103073142A (en) | 2013-01-11 | 2013-01-11 | Multiple-effect-group, low-temperature and multiple-effect distilled seawater desalination system |
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| CN115367825A (en) * | 2021-05-19 | 2022-11-22 | 中国石油化工股份有限公司 | Seawater desalination and condensation system and method |
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