CN103030185A - Low-temperature multi-effect sea water desalinization system - Google Patents
Low-temperature multi-effect sea water desalinization system Download PDFInfo
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- CN103030185A CN103030185A CN2012105555375A CN201210555537A CN103030185A CN 103030185 A CN103030185 A CN 103030185A CN 2012105555375 A CN2012105555375 A CN 2012105555375A CN 201210555537 A CN201210555537 A CN 201210555537A CN 103030185 A CN103030185 A CN 103030185A
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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 sea water desalinization, in particular to a low-temperature multi-effect sea water desalinization system which is used for improving the concentration ratio of sea water. The low-temperature multi-effect sea water desalinization system disclosed by the invention comprises a condenser, a vacuum pumping device communicated with an air outlet of the condenser, at least two evaporator groups connected in series, a heat pump communicated with an air inlet of a front-effect evaporator of a front evaporator group, at least one sea water preheater arranged on a sea water feeding pipeline which communicates a water outlet of the condenser and water inlets of all effect evaporators in the front evaporator group, a concentrated sea water drainage pipeline communicated with a water outlet of a rear-effect evaporator of a rear evaporator group, a product water drainage pipeline respectively communicated with a product water outlet of each effect evaorator and a product water outlet of the condenser, a concentrated sea water backflow pipeline respectively communicated with the concentrated sea water drainage pipeline and the sea water feeding pipeline, and a concentrated sea water backflow control valve arranged on the concentrated sea water backflow pipeline.
Description
Technical field
The present invention relates to field of sea water desalting technology, particularly a kind of low temperature multi-effect seawater desalting system.
Background technology
The low-temperature multiple-effect seawater desalination technology refers to that the high evaporation temperature of seawater is lower than 70 ℃ multi-effect distilling desalination techniques, with a plurality of evaporator series, pass through repeatedly evaporation and condensation with a certain amount of steam input, and the vaporization temperature of the vaporizer of last effect is greater than the vaporization temperature of vaporizer of a rear effect, thereby obtains being multiple times than the desalination process of the distilled water of quantity of steam.
In the low temperature multiple-effect distillation process, the seawater after concentrating directly discharging pollutes the environment, therefore, the sea water supply saltern after generally will concentrating, further concentrated rear salt manufacturing, the seawater enrichment factor is higher, and corresponding salt manufacturing cost is lower; But, when adopting existing low temperature multi-effect seawater desalting system that seawater is desalinated processing, the seawater enrichment factor is lower, thereby the salt manufacturing cost is less.
Summary of the invention
The object of the present invention is to provide a kind of low temperature multi-effect seawater desalting system, be used for improving the seawater enrichment factor.
To achieve these goals, the invention provides following technical scheme:
A kind of low temperature multi-effect seawater desalting system comprises:
The condenser that is communicated with the raw material seawater source;
Be communicated with described condenser air outlet, be used for the raw material seawater that enters described condenser is carried out degassed vacuum extractor;
The evaporation group of at least two series connection, each evaporation group comprise the vaporizer of at least one effect steamer or two effect series windings; Wherein, with evaporation group headed by the evaporation group that described condenser seawater water outlet is communicated with, the evaporation group that is communicated with described condenser inlet mouth is tail evaporation group;
The heat pump that is communicated with the first evaporator inlet mouth of raw material vapour source and described first evaporation group respectively;
Be arranged at least one the seawater preheating device on the charging seawaterline that is communicated with each single-effect evaporator water-in in described condenser seawater water outlet and the described first evaporation group, and a described seawater preheating device inlet mouth is communicated with the 1st effective evaporator air outlet;
Imitate the product water discharge pipe that described vaporizer product water water outlet and described condenser product water water outlet are communicated with each respectively;
The concentrated seawater discharge pipe that is communicated with last evaporator seawater water outlet in the described tail evaporation group;
The concentrated seawater return line that is communicated with described concentrated seawater discharge pipe and described charging seawaterline respectively, and be arranged on concentrated seawater recycle control valve on the described concentrated seawater return line.
Preferably, above-mentioned vaporizer is tube and shell heat exchanger.
Preferably, described evaporation group quantity is three, comprising: first evaporation group, tail evaporation group and the middle evaporation group between described first evaporation group and tail evaporation group; Wherein,
First evaporation group comprises the successively quadruple effect evaporator of series connection, and middle evaporation group comprises the successively triple-effect evaporator of series connection, and tail evaporation group comprises the successively two-effect evaporation device of series connection.
Preferably, described seawater preheating device is steam-water-to-water heat exchanger.
Preferably, described seawater preheating device quantity is four, is successively set on the described charging seawaterline.
Preferably, described heat pump is the thermo compression injector.
Preferably, described heat pump also is communicated with last evaporator air outlet in the described tail evaporation group.
Preferably, above-mentioned low temperature multi-effect seawater desalting system also comprises:
Adjacent with described condenser water outlet, be arranged on the middle water pump of first on the described charging seawaterline;
Water pump in the middle of correspondence arranges one second on the concentrated seawater pipeline of two evaporation groups that each connection is adjacent;
Be arranged on the concentrated seawater pump on the described concentrated seawater discharge pipe;
Be arranged on the product water pump on the described product water discharge pipe.
Preferably, except the first evaporator in the first evaporation group, the respectively corresponding product water flash tank of all the other each single-effect evaporators, each described product water flash tank water-in is communicated with the outlet of corresponding vaporizer product water, each described product water flash tank air outlet is communicated with corresponding evaporator air inlet, and all product water flash tanks are connected successively by described product water discharge pipe.
Preferably, above-mentioned low temperature multi-effect seawater desalting system also comprises: the condensate pump that is communicated with first evaporator condensation-water drain in the described first evaporation group.
Preferably, above-mentioned low temperature multi-effect seawater desalting system also comprises: be communicated with the last evaporator air outlet in the described tail evaporation group, for reducing the auxiliary condenser of raw material seawater temperature.
Preferably, above-mentioned low temperature multi-effect seawater desalting system also comprises: be arranged on the water-water heat exchanger on the pipeline that is communicated with described raw material seawater source and described condenser water-in, described water-water heat exchanger also is communicated with described product water discharge pipe or described concentrated seawater discharge pipe.
Low temperature multi-effect seawater desalting system provided by the invention comprises: at least two cascade evaporation groups, each evaporation group comprises at least one single-effect evaporator.During use, raw material seawater in condenser preheating and degassed after enter in the seawater preheating device further preheating, the raw material seawater after the preheating also is advanced in each single-effect evaporator shell in the first evaporation group; Raw material steam enters behind heat pump in the first evaporator heat-exchanging tube bundle in the first evaporation group, carries out heat exchange with the raw material seawater that enters in this vaporizer shell, discharge system after the condensation; A raw material 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 the tentatively concentrated seawater of remaining warp enters the lower 1st effective evaporator that is adjacent, further evaporation concentration.The secondary steam that last evaporator in the first evaporation group is discharged enters in the first evaporator heat-exchanging tube bundle in next the evaporation group that is adjacent, discharge concentrated after seawater and being advanced in each single-effect evaporator shell in next the evaporation group that is adjacent, further evaporation and concentrated, the rest may be inferred; The product water that condensation forms in each single-effect evaporator is by discharge system in the product water discharge pipe, a concentrated seawater part is discharged system by the concentrated seawater discharge pipe, another part concentrated seawater enters in the charging seawaterline through the concentrated seawater return line, change in the shell with each single-effect evaporator that enters first evaporation group after raw material seawater is mixed, so circulate, improved the concentration of the concentrated seawater of the last evaporator discharge from tail evaporation group.Therefore, compared with prior art, when utilizing low temperature multi-effect seawater desalting system provided by the invention to process seawater, can improve the seawater enrichment factor.
Description of drawings
The structural representation of a kind of low temperature multi-effect seawater desalting system that Fig. 1 provides for the embodiment of the invention.
Reference numeral:
101: first evaporation group; 102: middle evaporation group; 103: tail evaporation group;
1 ~ 9:1 to 9 single-effect evaporator; 10: condenser; 11～14: the seawater preheating device;
Water pump in the middle of 15～17: second; Water pump in the middle of 18: the first; 19: the product water pump;
20: condensate pump; 21: heat pump; 22: the concentrated seawater recycle control valve;
23～30: the product water flash tank; 31: the raw material vapour source; 32: the raw material seawater source;
33: the concentrated seawater discharge pipe; 34: the product water discharge pipe; 35: the condensed water elimination pipeline;
36: the charging seawaterline.
Embodiment
Existing low temperature multi-effect seawater desalting system is when desalinating processing to seawater, the seawater enrichment factor is lower, and the salt manufacturing cost is less.
In view of this, the invention provides a kind of improved technical scheme, by in low temperature multi-effect seawater desalting system, increasing concentrated seawater return line and concentrated seawater recycle control valve, make the concentrated seawater of discharging through the original sea water mixing part low temperature multi-effect seawater desalting system of the preliminary preheating of condenser, enter the highest head evaporation group of operating temperature after the further preheating of seawater preheating device, the seawater after preliminary the concentrating enters the further evaporation and concentrated of the lower rear evaporation group of temperature successively; Therefore, adopt low temperature multi-effect seawater desalting system provided by the invention, can improve the seawater enrichment factor.
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 embodiment of the invention provides a kind of low temperature multi-effect seawater desalting system, comprise,
The condenser 10 that is communicated with the raw material seawater source;
Be communicated with condenser 10 air outlets, be used for the raw material seawater that enters condenser 10 is carried out degassed vacuum extractor (not shown in FIG.);
The evaporation group of at least two series connection, each evaporation group comprise the vaporizer of at least one effect steamer or two effect series windings; With evaporation group headed by the evaporation group that condenser 10 seawater water outlets are communicated with, the evaporation group that is communicated with condenser 10 inlet mouths is tail evaporation group;
The heat pump 21 that is communicated with first evaporator inlet mouth in raw material vapour source 31 and the first evaporation group respectively;
Be arranged at least one the seawater preheating device on the charging seawaterline 36 that is communicated with each the single-effect evaporator water-in in condenser 10 seawater water outlets and the first evaporation group, and a seawater preheating device inlet mouth is communicated with the 1st effective evaporator air outlet;
The product water discharge pipe 34 that is communicated with every 1st effective evaporator product water water outlet and condenser 10 product water water outlets respectively;
The concentrated seawater discharge pipe 33 that is communicated with last evaporator seawater water outlet in the tail evaporation group;
The concentrated seawater return line that is communicated with concentrated seawater discharge pipe 33 and charging seawaterline 36 respectively, and be arranged on concentrated seawater recycle control valve 22 on the concentrated seawater return line.
The working process that the low temperature multi-effect seawater desalting system that utilizes the embodiment of the invention to provide is processed seawater is as follows:
At first, raw material seawater enter preheating in the condenser 10, degassed after, enter the further preheating of at least one seawater preheating device; Raw material seawater after the preheating also is advanced in each single-effect evaporator shell in the first evaporation group.
Enter after 21 preheatings of raw material steam process heat pump in the first evaporator heat-exchanging tube bundle in the first evaporation group, with the seawater to make heat exchange in the first evaporator shell that enters in the first evaporation group, the secondary steam that enters the raw material seawater generation in the described first evaporator shell enters in the lower 1st effective evaporator heat-exchanging tube bundle adjacent with described first evaporator, and preliminary concentrated seawater enters in the lower 1st effective evaporator shell adjacent with described first evaporator and further evaporates, concentrates; The secondary steam that last evaporator in the first evaporation group is discharged enters in the first evaporator heat-exchanging tube bundle in next evaporation group, each single-effect evaporator evaporation in head evaporation group and concentrated after seawater and be advanced into further evaporation and concentrated in each single-effect evaporator shell in next evaporation group, the product water that every 1st effective evaporator produces collects in discharge system in the product water discharge pipe; The rest may be inferred.
The secondary steam that last evaporator in the end evaporation group is discharged enters in condenser 10 heat-exchanging tube bundles and enters the interior raw material seawater heat exchange of condenser 10 shells, and the product water that forms after the condensation enters product water discharge pipe 34 discharge systems; The concentrated seawater that last evaporator in the evaporation group of end is discharged, a part of concentrated seawater enter in the charging seawaterline 36 with after raw material seawater is mixed, and enter in each the single-effect evaporator shell in the first evaporation group; Another part concentrated seawater enters the concentrated seawater discharge pipe and discharges system.
The low temperature multi-effect seawater desalting system that the embodiment of the invention provides, when seawater being desalinated processing, by concentrated seawater return line and concentrated seawater recycle control valve, can adjust and enter the concentration of seawater in each single-effect evaporator shell in the highest head evaporation group of operating temperature, the concentrated seawater of namely discharging through the original sea water mixing part low temperature multi-effect seawater desalting system of the preliminary preheating of condenser, improved and entered the concentration of seawater in each single-effect evaporator shell in the highest head evaporation group of operating temperature, thereby raw material seawater is after evaporating through each single-effect evaporator and concentrating, improved the concentrated seawater concentration of discharging, therefore, adopt low temperature multi-effect seawater desalting system provided by the invention, can improve the seawater enrichment factor.In addition, during the vaporizer normal operation, the temperature of the last evaporator of the first evaporator from head evaporation group in the tail evaporation group reduces gradually, the concentration of seawater that enters in the high vaporizer shell of temperature is low, the concentration of seawater that enters in the low vaporizer shell of temperature is high, has reduced the fouling of seawater in each single-effect evaporator shell.
The below is to comprise three evaporation groups and four seawater preheating devices as example, the low temperature multi-effect seawater desalting system that the embodiment of the invention of further explaining provides.
Continuation is referring to Fig. 1, low temperature multi-effect seawater desalting system comprises: the head evaporation group 101 of connecting successively, middle evaporation group 102 and tail evaporation group 103, the condenser 10 that is communicated with raw material seawater source 31, the vacuum extractor (not shown in FIG.) that is communicated with condenser 10 air outlets, the heat pump 21 that is communicated with raw material vapour source 31, be arranged on the seawater preheating device 11 on the charging seawaterline 36 that is communicated with each the single-effect evaporator water-in in condenser 10 water outlets and the first evaporation group 101, seawater preheating device 12, seawater preheating device 13 and seawater preheating device 14, the concentrated seawater discharge pipe 33 that is communicated with vaporizer 9 water outlets in the tail evaporation group 103, the product water discharge pipe 34 that is communicated with every 1st effective evaporator product water water outlet and condenser 10 product water water outlets respectively, the concentrated seawater return line that is communicated with concentrated seawater discharge pipe 33 and charging seawaterline 36 respectively, and be arranged on concentrated seawater recycle control valve 22 on the concentrated seawater return line.Wherein,
Condenser 10 water-ins are communicated with raw material seawater source 31, condenser 10 raw material seawater water outlets are communicated with each single-effect evaporator water-in in the first evaporation group 101 by charging seawaterline 36, namely be communicated with the water-in of vaporizer 1, vaporizer 2, vaporizer 3 and vaporizer 4 respectively, condenser 10 product water water outlets are communicated with product water discharge pipe 34; Condenser 10 inlet mouths are communicated with vaporizer 9 air outlets, and condenser 10 air outlets are communicated with vacuum extractor.After raw material seawater enters condenser 10, with the secondary steam heat exchange that vaporizer 9 is discharged, form product water after the secondary steam condensation by product water discharge pipe 34 discharge systems; Raw material seawater is in the raw material seawater of preliminary preheating enters each single-effect evaporator shell in the first evaporation group 101.Need to prove, in the present invention, vacuum extractor is also referred to as degassed for gases such as the oxygen of removing raw material seawater, carbonic acid gas, can reduce these gases to the corrosion of low temperature multi-effect seawater desalting system, prolong the work-ing life of low temperature multi-effect seawater desalting system.
Heat pump 21 inlet mouths are communicated with raw material vapour source 31, and heat pump 21 air outlets are communicated with vaporizer 1 inlet mouth.
First evaporation group 101 comprises: successively vaporizer 1, vaporizer 2, vaporizer 3 and the vaporizer 4 of series connection, wherein, the last evaporator headed by the first evaporator headed by the vaporizer 1 in the evaporation group 101, vaporizer 4 in the evaporation group 101; Vaporizer 1 inlet mouth is communicated with heat pump 21 air outlets, and vaporizer 1 air outlet is communicated with vaporizer 2 inlet mouths; Vaporizer 1 water-in is communicated with charging seawaterline 36, the outlet of vaporizer 1 product water is communicated with product water discharge pipe 34, the outlet of vaporizer 1 concentrated seawater is communicated with vaporizer 2 water-ins, and the rest may be inferred, and vaporizer 1, vaporizer 2, vaporizer 3 and vaporizer 4 are connected successively.Raw material steam enters in vaporizer 1 heat-exchanging tube bundle, and the secondary steam that vaporizer 1 is discharged enters in vaporizer 2 heat-exchanging tube bundles; Raw material seawater enters in vaporizer 1 shell, and the preliminary concentrated seawater that vaporizer 1 is discharged enters in vaporizer 2 shells; The rest may be inferred, and it is concentrated that raw material seawater enters respectively vaporizer 1, vaporizer 2, vaporizer 3 and vaporizer 4 stepped evaporations; The product water outlet of vaporizer 1, vaporizer 2, vaporizer 3 and vaporizer 4 is communicated with product water discharge pipe 34.
Middle evaporation group 102 comprises: vaporizer 5, vaporizer 6 and the vaporizer 7 of connecting successively; Wherein, vaporizer 5 is the first evaporator of middle evaporation group 102, and vaporizer 7 is the last evaporator of middle evaporation group 102.The outlet of vaporizer 4 concentrated seawaters is communicated with the water-in of vaporizer 5, vaporizer 6 and vaporizer 7 respectively, and vaporizer 4 air outlets are communicated with vaporizer 5 inlet mouths; The outlet of vaporizer 5 concentrated seawaters is communicated with vaporizer 6 water-ins, and vaporizer 5 air outlets are communicated with vaporizer 6 inlet mouths; The rest may be inferred, and vaporizer 5, vaporizer 6 and vaporizer 7 are connected successively, and the product water outlet of vaporizer 5, vaporizer 6 and vaporizer 7 is communicated with product water discharge pipe 34.
Tail evaporation group 103 comprises: vaporizer 8 and the vaporizer 9 of connecting successively; Vaporizer 8 is the first evaporator of tail evaporation group 103, and vaporizer 9 is the last evaporator of tail evaporation group 103.The outlet of vaporizer 7 concentrated seawaters is communicated with the water-in of vaporizer 8 and vaporizer 9 respectively, and vaporizer 7 air outlets are communicated with vaporizer 8 inlet mouths; The outlet of vaporizer 8 concentrated seawaters is communicated with vaporizer 9 water-ins, and vaporizer 8 air outlets are communicated with vaporizer 9 inlet mouths; Vaporizer 9 air outlets are communicated with condenser 10 inlet mouths, and vaporizer 9 concentrated seawater water outlets are communicated with concentrated seawater discharge pipe 33, and the product water outlet of vaporizer 8 and vaporizer 9 is communicated with product water discharge pipe 34.
Seawater preheating device 11, seawater preheating device 12, seawater preheating device 13 and seawater preheating device 14 are arranged on the charging seawaterline 36; Wherein, seawater preheating device 14 inlet mouths are communicated with vaporizer 3 air outlets, and the secondary steam part that vaporizer 3 is discharged enters seawater preheating device 14 and the raw material seawater heat exchange of flowing through; Seawater preheating device 13 inlet mouths are communicated with vaporizer 5 air outlets, and the secondary steam part that vaporizer 5 is discharged enters seawater preheating device 13 and the raw material seawater heat exchange of flowing through; Seawater preheating device 12 inlet mouths are communicated with vaporizer 7 air outlets, and the secondary steam part that vaporizer 7 is discharged enters seawater preheating device 12 and the raw material seawater heat exchange of flowing through; Seawater preheating device 11 inlet mouths are communicated with vaporizer 9 air outlets, and the secondary steam part that vaporizer 9 is discharged enters seawater preheating device 11 and the raw material seawater heat exchange of flowing through.Raw material seawater through condenser 10 preliminary preheatings is divided into three strands behind seawater preheating device 11, seawater preheating device 12 and seawater preheating device 13, enter respectively vaporizer 4, vaporizer 3 and seawater preheating device 14, seawater through seawater preheating device 14 is divided into again 2 strands, enter respectively vaporizer 2 and vaporizer 1, the raw material seawater temperature promotes 4 ~ 7 ° through each seawater preheating device.So design can take full advantage of the secondary steam that vaporizer produces, and reduces energy waste, thereby reduces the cost of isolating product water from seawater.
The principle of work of low temperature multi-effect seawater desalting system is as follows in above-described embodiment:
Raw material seawater enters preheating in the condenser 10, degassed under the effect of vacuum extractor, then flow out from condenser 10 water outlets, after entering seawater preheating device 11, seawater preheating device 12 and the 13 further preheatings of seawater preheating device, the raw material seawater of preliminary preheating is divided into three strands, enter respectively vaporizer 4, vaporizer 3 and seawater preheating device 14, be divided into again 2 strands through the seawater behind the seawater preheating device 14, enter respectively vaporizer 2 and vaporizer 1.
Enter the vaporizer 1 of first evaporation group behind the raw material steam process heat pump 21 mixing secondary steams, carry out heat exchange with the raw material seawater that enters vaporizer 1, raw material vapor condensation after the heat exchange forms product water, by product water discharge pipe 34 discharge systems, a raw material seawater part that enters vaporizer 1 is heated and is flashed to secondary steam and enter in the lower 1st effective evaporator 2 adjacent with vaporizer 1 as thermal source, preliminary concentrated seawater enters in the vaporizer 2, and mix with the raw material seawater that directly enters in the vaporizer 2 by charging seawaterline 34, further evaporate and concentrate; The secondary steam that vaporizer 2 is discharged enters vaporizer 3, and the concentrated seawater that vaporizer 2 is discharged enters in the vaporizer 3, and mixes with the raw material seawater that directly enters in the vaporizer 3 by charging seawaterline 34, further evaporates and concentrates; The secondary steam part that vaporizer 3 is discharged offers seawater preheating device 14 as thermal source, another part enters vaporizer 4, and mix with the raw material seawater that directly enters in the vaporizer 4 by charging seawaterline 34, further evaporation and concentrated, the secondary steam that vaporizer 4 is discharged advances in the vaporizer 5, vaporizer 5, vaporizer 6 and the vaporizer 7 of evaporation group through the seawater of vaporizer 1, vaporizer 2, vaporizer 3 and vaporizer 4 evaporation concentration and in the middle of being advanced into; In other words, concentrated seawater after the heat exchange evaporation is finished in the vaporizer 1 enters vaporizer 2 and carries out flash distillation, then the concentrated seawater of mixing evaporator 2 enters vaporizer 3 and carries out flash distillation, then the concentrated seawater of mixing evaporator 3 generations enters vaporizer 4 and carries out flash distillation, then the concentrated seawater that produces of mixing evaporator 4 is divided into three strands and enters vaporizer 5, vaporizer 6 and vaporizer 7, the rest may be inferred, the secondary steam that vaporizer 9 is discharged enters in the condenser 10, with the raw material seawater heat exchange that enters in the condenser 10, form product water after the condensation and enter product water discharge pipe 34 discharge systems; The concentrated seawater part that vaporizer 9 is discharged is by concentrated seawater discharge pipe 33 direct discharge systems, another part enters in the charging seawaterline 36 through the concentrated seawater reflux line, be mixed into each single-effect evaporator of first evaporation group with the raw material seawater through the preliminary preheating of condenser, so circulating and evaporating is concentrated, and the seawater enrichment factor can reach 3; Therefore, compared with prior art, the low temperature multi-effect seawater desalting system that adopts the embodiment of the invention to provide can improve the seawater enrichment factor.And because 9 temperature reduces gradually from vaporizer 1 to vaporizer, the concentration of seawater that enters in the high vaporizer of temperature is low, and the concentration of seawater that enters in the low vaporizer shell of temperature is high, can effectively reduce seawater fouling in the vaporizer shell.
Preferably, above-mentioned vaporizer 1 ~ vaporizer 9 is tube and shell heat exchanger, raw material seawater or preliminary concentrated seawater enter in the vaporizer shell from water-in, raw material steam or secondary steam enter in the heat exchange pipe of evaporator bundle from the inlet mouth of vaporizer, carry out heat exchange with the raw material seawater or the preliminary concentrated seawater that enter in the vaporizer shell, form product water after the condensation and discharge system; Seawater after concentrated enters lower 1st effective evaporator or discharge system.
In order to reduce the cost of manufacture of low temperature multi-effect seawater desalting system, and the seawater concentrated effect, preferably, in the above-mentioned low temperature multi-effect seawater desalting system, evaporation group quantity is three, comprising: first evaporation group, tail evaporation group and the middle evaporation group between described first evaporation group and tail evaporation group; Wherein, first evaporation group comprises the successively quadruple effect evaporator of series connection, and middle evaporation group comprises the successively triple-effect evaporator of series connection, and tail evaporation group comprises the successively two-effect evaporation device of series connection.
Preferably, above-mentioned seawater preheating device is steam-water-to-water heat exchanger, and seawater enters in the seawater preheating device heat-exchanging tube bundle, and secondary steam enters in the shell of seawater preheating device, and condensation is discharged by coupled pipeline behind secondary steam and the seawater to make heat exchange.Preferably, in the above-mentioned low temperature multi-effect seawater desalting system, seawater preheating device quantity is four, is successively set on the charging seawaterline 36.
Preferably, in the above-mentioned low temperature multi-effect seawater desalting system, heat pump 21 is the thermo compression injector; Preferably, heat pump 21 also is communicated with last evaporator air outlet in the tail evaporation group, and namely heat pump 21 steam suction ports are communicated with vaporizer 9 air outlets; In the present embodiment, the secondary steam part that vaporizer 9 is discharged provides condenser 10, and another part offers heat pump 21, is used for promoting the capacity usage ratio of raw material steam.The low situation of the intake pressure of the raw material steam that provides for the external world can also be communicated with the vaporizer air outlet that heat pump 21 and other temperature are higher, and the secondary steam that absorption pressure is higher is with the higher ejection efficiency of acquisition.
Continuation is referring to Fig. 1, and further, in order to improve the efficient of low temperature multi-effect seawater desalting system concentrated seawater, low temperature multi-effect seawater desalting system also comprises: adjacent with condenser 10 water outlets, be arranged on the middle water pump 15 of first on the charging seawaterline 36; Water pump in the middle of correspondence arranges one second on the concentrated seawater pipeline of two evaporation groups that each connection is adjacent; Be arranged on the concentrated seawater pump 18 on the concentrated seawater discharge pipe 33; Be arranged on the product water pump 19 on the described product water discharge pipe.In the present embodiment, be communicated with on the seawaterline of first evaporation group 101 and middle evaporation group 102, in other words, be communicated with vaporizer 4 seawer outlets, and on the seawaterline of vaporizer 5, vaporizer 6 and vaporizer 7 water-ins, one second middle water pump 16 is set; Be arranged on the seawaterline that is communicated with middle evaporation group 102 and tail evaporation group 103, one second middle water pump 17 is set.Can improve the circulation efficiency of seawater in low temperature multi-effect seawater desalting system by increasing these pump housings, thereby improve the efficient of low temperature multi-effect seawater desalting system concentrated seawater.
Continuation is referring to Fig. 1, in order to take full advantage of steam heat, in the above-mentioned low temperature multi-effect seawater desalting system, except the first evaporator in the first evaporation group, the respectively corresponding product water flash tank of all the other each single-effect evaporators, each described product water flash tank water-in is communicated with the outlet of corresponding vaporizer product water, each described product water flash tank air outlet and corresponding evaporator air inlet connection, and all product water flash tanks are connected successively by described product water discharge pipe.In the present embodiment, product water flash tank 23 is communicated with corresponding vaporizer 2, product water flash tank 24 is communicated with corresponding vaporizer 3, product water flash tank 25 is communicated with corresponding vaporizer 4, product water flash tank 26 is communicated with corresponding vaporizer 5, product water flash tank 27 is communicated with corresponding vaporizer 6, product water flash tank 28 is communicated with corresponding vaporizer 7, product water flash tank 29 is communicated with corresponding vaporizer 8, product water flash tank 30 is communicated with corresponding vaporizer 9, and the said products water flash tank is by 34 series connection of product water discharge pipe.The water of condensation that produces in vaporizer 2 enters product water flash tank 23 as product water and carries out flash distillation, and flash steam enters vaporizer 2; Finish mixing evaporator 3 produces after the flash distillation product water and enter product water flash tank 24 and carry out flash distillation, flash steam enters vaporizer 4, the like, after finally all product waters are pooled to flash tank 30, promote and discharge system as product water by product water pump 19.
Preferably, above-mentioned low temperature multi-effect seawater desalting system also comprises: the condensate pump that is communicated with first evaporator condensation-water drain in the head evaporation group; The i.e. condensate pump 20 that is communicated with of the condensation-water drain of vaporizer 1 in the present embodiment, the water of condensation that can avoid vaporizer 1 to discharge mixes with the product water that rear single-effect evaporator is discharged, the water of condensation of discharging because of vaporizer 1 mainly is that the external world provides the vapor condensation product, wherein may contain other materials, thus the product water water quality that the raising system discharges.
Advance the before situation of excess Temperature of condenser 10 for raw material seawater, preferably, above-mentioned low temperature multi-effect seawater desalting system also comprises: be communicated with the last evaporator air outlet in the tail evaporation group, for reducing the auxiliary condenser of raw material seawater temperature; Utilize extra water coolant to absorb the unnecessary secondary steam heat that vaporizer 9 produces, the raw material seawater temperature of discharging with control condenser 10 is in reasonable level.
Otherwise, 10 temperature are excessively low if raw material seawater enters condenser, preferably, above-mentioned low temperature multi-effect seawater desalting system also comprises: be arranged on the water-water heat exchanger on the pipeline that is communicated with raw material seawater source and condenser water-in, water-water heat exchanger also is communicated with product water discharge pipe or described concentrated seawater discharge pipe.Can be with the raw material seawater preheating, to improve the raw material seawater temperature that enters condenser 10 by this water-water heat exchanger.
In the above-described embodiments, the quantity of evaporation group is three, and the quantity of seawater preheating device is four, and first evaporation group 101 comprises four successively vaporizers of series connection, middle evaporation group 102 comprises three successively vaporizers of series connection, and tail evaporation group 103 comprises two successively vaporizers of series connection; But be not limited to this, can select according to actual needs to be arranged on evaporation group in the low temperature multi-effect seawater desalting system and the quantity of seawater preheating device, for example, in order to reduce initial investment, low temperature multi-effect seawater desalting system comprises a seawater preheating device and two evaporation groups, and each evaporation group comprises 1st effective evaporator; And for example, in order to improve water generation ratio, low temperature multi-effect seawater desalting system comprises two or more evaporation groups, and each evaporation group comprises two or more vaporizers.
In sum, utilize low temperature multi-effect seawater desalting system provided by the invention, when seawater being desalinated processing, by concentrated seawater return line and concentrated seawater recycle control valve, can adjust and enter the concentration of seawater in each single-effect evaporator shell in the highest head evaporation group of operating temperature, the concentrated seawater of namely discharging through the original sea water mixing part low temperature multi-effect seawater desalting system of the preliminary preheating of condenser, improved and entered the raw material seawater concentration in each single-effect evaporator shell in the highest head evaporation group of operating temperature, raw material seawater can access the higher concentrated seawater of concentration through after each single-effect evaporator evaporation and concentrating; Therefore, adopt low temperature multi-effect seawater desalting system provided by the invention, improved the seawater enrichment factor.In addition, during the vaporizer normal operation, the temperature of the last evaporator of the first evaporator from head evaporation group in the tail evaporation group reduces gradually, thereby the concentration of seawater that enters in the high vaporizer shell of temperature is low, the concentration of seawater that enters in the low vaporizer shell of temperature is high, has reduced the fouling of seawater in each single-effect evaporator shell.
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 (12)
1. a low temperature multi-effect seawater desalting system is characterized in that, comprising:
The condenser that is communicated with the raw material seawater source;
Be communicated with described condenser air outlet, be used for the raw material seawater that enters described condenser is carried out degassed vacuum extractor;
The evaporation group of at least two series connection, each evaporation group comprise the vaporizer of at least one effect steamer or two effect series windings; Wherein, with evaporation group headed by the evaporation group that described condenser seawater water outlet is communicated with, the evaporation group that is communicated with described condenser inlet mouth is tail evaporation group;
The heat pump that is communicated with first evaporator inlet mouth in raw material vapour source and the described first evaporation group respectively;
Be arranged at least one the seawater preheating device on the charging seawaterline that is communicated with each single-effect evaporator water-in in described condenser seawater water outlet and the described first evaporation group, and a described seawater preheating device inlet mouth is communicated with the 1st effective evaporator air outlet;
Imitate the product water discharge pipe that described vaporizer product water water outlet and described condenser product water water outlet are communicated with each respectively;
The concentrated seawater discharge pipe that is communicated with last evaporator seawater water outlet in the described tail evaporation group;
The concentrated seawater return line that is communicated with described concentrated seawater discharge pipe and described charging seawaterline respectively, and be arranged on concentrated seawater recycle control valve on the described concentrated seawater return line.
2. low temperature multi-effect seawater desalting system as claimed in claim 1 is characterized in that, described vaporizer is tube and shell heat exchanger.
3. low temperature multi-effect seawater desalting system as claimed in claim 2 is characterized in that, described evaporation group quantity is three, comprising: first evaporation group, tail evaporation group and the middle evaporation group between described first evaporation group and tail evaporation group; Wherein,
First evaporation group comprises the successively quadruple effect evaporator of series connection, and middle evaporation group comprises the successively triple-effect evaporator of series connection, and tail evaporation group comprises the successively two-effect evaporation device of series connection.
4. low temperature multi-effect seawater desalting system as claimed in claim 1 is characterized in that, described seawater preheating device is steam-water-to-water heat exchanger.
5. low temperature multi-effect seawater desalting system as claimed in claim 4 is characterized in that, described seawater preheating device quantity is four, is successively set on the described charging seawaterline.
6. low temperature multi-effect seawater desalting system as claimed in claim 1 is characterized in that, described heat pump is the thermo compression injector.
7. low temperature multi-effect seawater desalting system as claimed in claim 6 is characterized in that, described heat pump also is communicated with last evaporator air outlet in the described tail evaporation group.
8. such as the arbitrary described low temperature multi-effect seawater desalting system of claim 1-7, it is characterized in that, also comprise:
Adjacent with described condenser water outlet, be arranged on the middle water pump of first on the described charging seawaterline;
Water pump in the middle of correspondence arranges one second on the concentrated seawater pipeline of two evaporation groups that each connection is adjacent;
Be arranged on the concentrated seawater pump on the described concentrated seawater discharge pipe;
Be arranged on the product water pump on the described product water discharge pipe.
9. low temperature multi-effect seawater desalting system as claimed in claim 8, it is characterized in that, except the first evaporator in the first evaporation group, the respectively corresponding product water flash tank of all the other each single-effect evaporators, each described product water flash tank water-in is communicated with the outlet of corresponding vaporizer product water, each described product water flash tank air outlet is communicated with corresponding evaporator air inlet, and all product water flash tanks are connected successively by described product water discharge pipe.
10. low temperature multi-effect seawater desalting system as claimed in claim 9 is characterized in that, also comprises: the condensate pump that is communicated with first evaporator condensation-water drain in the described first evaporation group.
11. low temperature multi-effect seawater desalting system as claimed in claim 10 is characterized in that, also comprises: be communicated with the last evaporator air outlet in the described tail evaporation group, for reducing the auxiliary condenser of raw material seawater temperature.
12. low temperature multi-effect seawater desalting system as claimed in claim 11, it is characterized in that, also comprise: be arranged on the water-water heat exchanger on the pipeline that is communicated with described raw material seawater source and described condenser water-in, described water-water heat exchanger also is communicated with described product water discharge pipe or described concentrated seawater discharge pipe.
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| CN103833094A (en) * | 2014-03-18 | 2014-06-04 | 江苏星瑞化工工程科技有限公司 | Method for treating high-salinity wastewater |
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Effective date of registration: 20170619 Address after: 100034 Beijing, Fuchengmen, North Street, No. 6 -6 international investment building, block A, Co-patentee after: Chinese Electronic Engineering Design Institute Patentee after: STATE DEVELOPMENT & INVESTMENT CORPORATION (SDIC) Address before: 100840 Haidian District, Wanshou Road, No. 27, Patentee before: Chinese Electronic Engineering Design Institute |