CN102329037B - Low-temperature multi-effect evaporation seawater desalinization device and method for desalting seawater - Google Patents
Low-temperature multi-effect evaporation seawater desalinization device and method for desalting seawater Download PDFInfo
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- CN102329037B CN102329037B CN201110325674.5A CN201110325674A CN102329037B CN 102329037 B CN102329037 B CN 102329037B CN 201110325674 A CN201110325674 A CN 201110325674A CN 102329037 B CN102329037 B CN 102329037B
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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
Low-temperature multi-effect evaporation seawater desalinization device and method for desalting seawater.Vaporizer-condenser heat transfer tube surface scale problem limits the development of desalting seawater through multi-effect evaporation technology.Its composition of this product comprises: the vaporizer-condenser group (1) connecting raw material seawater pump (5), the strong brine flash distillation space that described vaporizer-condenser group is connected successively, the strong brine pipeline of upper effect vaporizer-condenser (8) is connected to next effect vaporizer-condenser (9) shell-side through brinepump, steam injector (2) imitate with 1-N in arbitrary effect be connected, end effect vaporizer-condenser and strong brine pump (7), take out condenser (3) described in non-condensable gas device (4) and fresh water pump (6) is connected.The present invention is used for the sea water desaltination of low-temperature multi-effect evaporation mode.
Description
technical field:
the present invention relates to a kind of sea water desalinating plant field, be specifically related to a kind of low-temperature multi-effect evaporation seawater desalinization device and implementation method.
background technology:
along with expanding economy, the growth of population and the overexploitation of groundwater resource, scarcity of fresh water resources has become the bottleneck of restriction China especially Coastal Area of Northern Sustainable Socioeconomic Development, sea water desaltination as new be one of effective way solving shortage of fresh water for water-supply source.
vaporizer-condenser heat transfer tube surface scale problem limits the development of desalting seawater through multi-effect evaporation technology.Along with the progress of the development of preventing fouling, the appearance of new and effective evaporation equipment and low-temperature evaporation technology, develop low-temperature multi-effect evaporation seawater desalinization technology in late 1960s.
in current low-temperature multi-effect evaporation seawater desalinization device, the layout of vaporizer-condenser raw material seawater charging flow process all adopts the mode of parallel fill-out mode or adverse current feeding.Parallel fill-out mode enters the seawater flow approximately equal of each vaporizer-condenser, parallel fill-out general requirement respectively imitates vaporizer-condenser to the concentration ratio of seawater also approximately equal, under high temperature, seawater is easy to fouling, therefore seawater concentration ratio can not be too large, and parallel fill-out seawater temperature is lower than temperature of saturation, a vaporizer-condenser tube bank top area part is used for heating seawater to temperature of saturation, slightly large relative to forward feeding vaporizer-condenser area.Along with the continuous increase of sea water desalinating plant water production rate, the mode of parallel fill-out needs more raw material seawater, adds cost of investment and the running cost of sea-water pump.Adverse current feeding mode can make full use of the heat transfer temperature difference of cold fluid and hot fluid, is a kind of flow process of the best from the viewpoint of heat transfer; But along with the rising of seawater temperature, in seawater, the solubleness of easy fouling salt reduces, and fouling tendency increases, the concentration of seawater of adverse current feeding high-temperature zone is high, make device be easy to corrosion and fouling, need use expensive material or carry out special processing to material, increase installation cost; And salt solution is imitated forward by aftereffect to be needed to be carried by pump, adds plant investment and running cost.In design in the past, low-temperature multi-effect vaporizer adopts flash tank to carry out the flash distillation of fresh water and concentrated seawater usually, adds the complicacy of system, improves the cost of investment of equipment.
summary of the invention:
the object of this invention is to provide a kind of low-temperature multi-effect evaporation seawater desalinization device that there is reasonable circulation and arrange.This device adopts the new flow arrangement mode of a kind of " piecewise-parallel-forward feeding ", does not arrange flash tank separately, can utilize the low-grade waste heat of power plant thus greatly reduce water producing cost and effective generation reducing fouling and corrosion.
above-mentioned object is realized by following technical scheme:
a kind of low-temperature multi-effect evaporation seawater desalinization device, its composition comprises: the vaporizer-condenser group connecting raw material seawater pump, the strong brine flash distillation space that described vaporizer-condenser group is connected successively, the strong brine pipeline of a upper effect vaporizer-condenser is connected to next effect vaporizer-condenser shell-side through brinepump, steam injector imitate with 1-N in arbitrary effect be connected, end effect vaporizer-condenser and strong brine pump, take out non-condensable gas device, condenser and fresh water pump and be connected
described vaporizer-condenser group is containing multiple vaporizer-condenser, and the first vaporizer-condenser group is connected with described condenser, takes out non-condensable gas device described in described condenser connection;
a described row vaporizer-condenser is horizontal tube falling film evaporation condenser, and described vaporizer-condenser has flash distillation space, fresh water pipe side and concentrated seawater shell-side flash distillation space;
the desalination method of described low-temperature multi-effect evaporation seawater desalinization device is as described below:
present method adopts the mode of " piecewise-parallel-forward feeding ", by a row vaporizer-condenser grouping, often group is containing multiple vaporizer-condenser, first seawater is evenly distributed in first group of vaporizer-condenser, seawater after concentrated converges rear evenly distribute and enters in second group of vaporizer-condenser, finally converges in last platform vaporizer-condenser by that analogy; After evaporation of seawater, concentrated seawater directly enters next shell-side flash distillation space flash distillation; Secondary steam directly enters next pipe side flash distillation space flash distillation after being condensed into fresh water; The secondary steam that steam injector injection vaporizer-condenser produces and power steam are mixed into First vaporizer-condenser.
beneficial effect:
1. the present invention can utilize the low-grade waste heat of power plant thus greatly reduce the generation of water producing cost and effectively reduction fouling and corrosion.
the present invention has very large advantage technically and economically, and when the share in sea water desaltination market constantly expands, water-electricity cogeneration low-temperature multi-effect evaporates the mainstream technology that will become following s-generation desalimtor.
the present invention can make heat energy be reused, and water generation ratio is almost by the increase at double of effect number; Gather the advantage of parallel fill-out and forward feeding, optimized seawater desalination system flow arrangement, decreased the complicacy of device, considerably reduce raw material seawater flow; By arranging flash distillation space in vaporizer-condenser, cancelling the use of flash tank, reducing the complicacy of system.Reduce equipment investment cost and running cost, reduce and always make water cost.
desalination technology of the present invention refers to that the most high evaporation temperature (TBT) of salt solution is no more than the sea water desaltination of 70 DEG C, almost no longer scale formation occurs under low temperature through simple pretreated seawater in vaporizer-condenser.
vaporizer-condenser of the present invention arranges fresh water and strong brine flash distillation space, saves flash tank, reduces the complicacy of system while reclaiming heat.Adopt the mode of piecewise-parallel-forward feeding, decrease flow and the power consumption of sea-water pump, optimize seawater feeding system, reduce equipment investment cost and running cost.
accompanying drawing illustrates:
accompanying drawing 1 is structural representation of the present invention.
embodiment:
embodiment 1:
a kind of low-temperature multi-effect evaporation seawater desalinization device, its composition comprises: a row vaporizer-condenser 1 of connecting successively, steam injector 2, condenser 3, take out non-condensable gas device 4, raw material seawater pump 5, fresh water pump 6, concentrated seawater pump 7, a described row vaporizer-condenser of connecting successively comprises First vaporizer-condenser 8 and last vaporizer-condenser 9, described First vaporizer-condenser connects steam injector, last described vaporizer-condenser connects condenser, described condenser connects takes out non-condensable gas device, described condenser connects raw material seawater pump, last vaporizer-condenser described in described fresh water pump connects, last described vaporizer-condenser connects concentrated seawater pump.
embodiment 2:
low-temperature multi-effect evaporation seawater desalinization device described in embodiment 1, a described row vaporizer-condenser is horizontal tube falling film evaporation condenser, and described vaporizer-condenser has flash distillation space, fresh water pipe side and concentrated seawater shell-side flash distillation space.
embodiment 3:
a kind of low-temperature multi-effect evaporation seawater desalinization method, described method adopts the mode of " piecewise-parallel-forward feeding ", one row vaporizer-condenser is divided into several groups, often group is containing multiple vaporizer-condenser, first seawater is evenly distributed in first group of vaporizer-condenser, seawater after concentrated converges rear evenly distribute and enters in second group of vaporizer-condenser, finally converges in last platform vaporizer-condenser by that analogy; After evaporation of seawater, concentrated seawater directly enters next shell-side flash distillation space flash distillation; Secondary steam directly enters next pipe side flash distillation space flash distillation after being condensed into fresh water.
embodiment 4:
low-temperature multi-effect evaporation seawater desalinization method described in embodiment 3, the secondary steam that steam injector injection vaporizer-condenser produces and power steam are mixed into First vaporizer-condenser.
embodiment 5:
low-temperature multi-effect evaporation seawater desalinization device described in above embodiment, this low-temperature multi-effect evaporation seawater desalinization device comprises 1-N vaporizer-condenser (each be called an effect), 1 steam injector, 1 condenser, takes out non-condensable gas device, strong brine pump, fresh water pump, raw material seawater pump etc.1-N vaporizer-condenser is segmental influent, whole vaporizer-condenser is divided into several groups, often group is containing multiple vaporizer-condenser, first seawater is evenly distributed in first group of vaporizer-condenser, seawater after concentrated converges rear evenly distribute and enters in second group of vaporizer-condenser, finally converges to by that analogy in end effect vaporizer-condenser; Steam injector imitate with 1-N in arbitrary effect be connected, end effect vaporizer-condenser is connected with condenser, and take out non-condensable gas device and be connected with condenser, non-condensable gas is pooled in condenser and extracts out.Each described vaporizer-condenser is horizontal tube falling film evaporation condenser, and with fresh water and concentrated seawater flash distillation space.
embodiment 6:
the implementation method of the low-temperature multi-effect evaporation seawater desalinization device described in above embodiment, described implementation method comprises the following steps: the raw steam that Power Plant is extracted out is as the working steam of steam injector, aspirate the part secondary steam of a certain effect vaporizer-condenser, the outlet vapor of steam injector imitates the heating steam of vaporizer-condenser as first.First effect vaporizer-condenser heating steam gets back to Water of Power Plant system after condensation heat in pipe.Fresh water in second effect vaporizer-condenser sweating room flows into the flash distillation space of triple effect evaporation condenser, because of decompression, part fresh water flash-off of steam, imitate the secondary steam that vaporizer-condenser produces and collect with second the heating steam becoming triple effect evaporation condenser, the rest may be inferred for fresh water flow process.The secondary steam that the vaporizer-condenser connecting steam injector produces, part is by steam injector injection to the first effect vaporizer-condenser, and remainder is as the heating steam of next effect vaporizer-condenser.The secondary vapour that N imitates vaporizer-condenser generation enters condenser, collects, is extracted out by fresh water pump, after cooling further, become product water after condensation with the condensed water of former effect vaporizer-condenser.
embodiment 7:
low-temperature multi-effect evaporation seawater desalinization device described in above embodiment, the seawater spraying entering vaporizer-condenser forms falling film evaporation outward to heat-exchanging tube bundle, and part water evaporates is secondary steam, and all the other seawater are condensed to as the higher strong brine of salinity.Strong brine confluxes by effect, namely the strong brine of the first effect vaporizer-condenser enters the strong brine flash distillation space of the second effect vaporizer-condenser shell-side, the strong brine of imitating vaporizer-condenser with second collects, because the first effect vaporizer-condenser strong brine temperature is higher than the salt solution temperature of saturation in the second effect vaporizer-condenser, enter moisture content in the strong brine of the second effect vaporizer-condenser by generating portion flash distillation, increase the secondary steam output of the second effect vaporizer-condenser.The salt solution of the first effect, the second effect vaporizer-condenser collects the rear charging as next effect vaporizer-condenser.The rest may be inferred, until the strong brine that N imitates vaporizer-condenser is discharged outside vaporizer-condenser through brinepump.
Claims (1)
1.
a kind of low-temperature multi-effect evaporation seawater desalinization method, its composition comprises: the vaporizer-condenser group connecting raw material seawater pump, it is characterized in that: the strong brine flash distillation space that described vaporizer-condenser group is connected successively, the strong brine pipeline of a upper effect vaporizer-condenser is connected to next effect vaporizer-condenser shell-side through brinepump, steam injector imitate with 1-N in arbitrary effect be connected, end effect vaporizer-condenser and strong brine pump, take out non-condensable gas device, condenser and fresh water pump and be connected
described vaporizer-condenser group is containing multiple vaporizer-condenser, and the first vaporizer-condenser group is connected with described condenser, takes out non-condensable gas device described in described condenser connection;
a described row vaporizer-condenser is horizontal tube falling film evaporation condenser, and described vaporizer-condenser has flash distillation space, fresh water pipe side and concentrated seawater shell-side flash distillation space;
described desalination method is as described below:
described sea water desaltination refers to that the most high evaporation temperature of salt solution is no more than the sea water desaltination of 70 DEG C, through pretreated seawater, scale formation no longer occurs in vaporizer-condenser under low temperature,
present method adopts the mode of " piecewise-parallel-forward feeding ", by a row vaporizer-condenser grouping, often group is containing multiple vaporizer-condenser, first seawater is evenly distributed in first group of vaporizer-condenser, seawater after concentrated converges rear evenly distribute and enters in second group of vaporizer-condenser, finally converges in last platform vaporizer-condenser by that analogy; After evaporation of seawater, concentrated seawater directly enters next shell-side flash distillation space flash distillation; Secondary steam directly enters next pipe side flash distillation space flash distillation after being condensed into fresh water; The secondary steam that steam injector injection vaporizer-condenser produces and power steam are mixed into First vaporizer-condenser;
the raw steam that Power Plant is extracted out is as the working steam of steam injector, aspirate the part secondary steam of a certain effect vaporizer-condenser, the outlet vapor of steam injector imitates the heating steam of vaporizer-condenser as first, first effect vaporizer-condenser heating steam gets back to Water of Power Plant system after condensation heat in pipe, fresh water in second effect vaporizer-condenser sweating room flows into the flash distillation space of triple effect evaporation condenser, because of decompression, part fresh water flash-off of steam, imitate the secondary steam that vaporizer-condenser produces and collect with second the heating steam becoming triple effect evaporation condenser, the rest may be inferred for fresh water flow process, the secondary steam that the vaporizer-condenser connecting steam injector produces, part is imitated vaporizer-condenser by steam injector injection to first, remainder is as the heating steam of next effect vaporizer-condenser, the secondary vapour that N imitates vaporizer-condenser generation enters condenser, collect with the condensed water of former effect vaporizer-condenser after condensation, extracted out by fresh water pump, product water is become after cooling further,
the seawater spraying entering vaporizer-condenser forms falling film evaporation outward to heat-exchanging tube bundle, part water evaporates is secondary steam, all the other seawater are condensed to as the higher strong brine of salinity, strong brine confluxes by effect, namely the strong brine of the first effect vaporizer-condenser enters the strong brine flash distillation space of the second effect vaporizer-condenser shell-side, the strong brine of imitating vaporizer-condenser with second collects, because the first effect vaporizer-condenser strong brine temperature is higher than the salt solution temperature of saturation in the second effect vaporizer-condenser, enter moisture content in the strong brine of the second effect vaporizer-condenser by generating portion flash distillation, increase the secondary steam output of the second effect vaporizer-condenser, first effect, the salt solution of the second effect vaporizer-condenser collects the rear charging as next effect vaporizer-condenser, the rest may be inferred, until the strong brine that N imitates vaporizer-condenser is discharged outside vaporizer-condenser through brinepump.
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| CN103030185B (en) * | 2012-12-19 | 2014-07-09 | 中国电子工程设计院 | Low-temperature multi-effect sea water desalinization system |
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| CN105692750B (en) * | 2016-03-04 | 2018-07-31 | 华北电力大学 | A kind of multiple-effect distillation seawater desalination system using surplus heat of power plant |
| CN105712423B (en) * | 2016-03-04 | 2018-07-31 | 华北电力大学 | Utilize the MED-TVC seawater desalination combined systems of surplus heat of power plant |
| CN105800716B (en) * | 2016-04-01 | 2018-10-16 | 南京航空航天大学 | Utilize the seawater desalination system and method for refrigeration system condensation waste heat |
| CN110182872B (en) * | 2019-04-30 | 2020-11-27 | 山东大学 | Ejector, multi-effect distillation seawater desalination system and seawater desalination method |
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