CN107010684A - A kind of low temperature multi-effect seawater desalting system - Google Patents
A kind of low temperature multi-effect seawater desalting system Download PDFInfo
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- CN107010684A CN107010684A CN201710268410.8A CN201710268410A CN107010684A CN 107010684 A CN107010684 A CN 107010684A CN 201710268410 A CN201710268410 A CN 201710268410A CN 107010684 A CN107010684 A CN 107010684A
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- heat
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- heat exchanger
- fluid reservoir
- water
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- 239000013535 sea water Substances 0.000 title claims abstract description 74
- 238000011033 desalting Methods 0.000 title claims abstract description 20
- 239000013505 freshwater Substances 0.000 claims abstract description 85
- 238000009833 condensation Methods 0.000 claims abstract description 18
- 230000005494 condensation Effects 0.000 claims abstract description 18
- 238000001704 evaporation Methods 0.000 claims abstract description 13
- 238000010612 desalination reaction Methods 0.000 claims abstract description 12
- 230000008020 evaporation Effects 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims description 109
- 239000012266 salt solution Substances 0.000 claims description 75
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 42
- 239000002351 wastewater Substances 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 239000012267 brine Substances 0.000 claims description 12
- 239000003507 refrigerant Substances 0.000 claims description 12
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 7
- 230000002745 absorbent Effects 0.000 claims description 7
- 239000002250 absorbent Substances 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 6
- 239000003643 water by type Substances 0.000 claims description 6
- 230000007306 turnover Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000002309 gasification Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 238000007781 pre-processing Methods 0.000 description 11
- 238000005057 refrigeration Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000284 extract Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000004821 distillation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000011552 falling film Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001007 puffing effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
A kind of low temperature multi-effect seawater desalting system, by the use of heat pump circulating system condenser as desalinization high temperature heat source, the evaporator of heat pump circulating system as desalinization low-temperature heat source, the temperature difference of high temperature heat source and low-temperature heat source is between 30 DEG C ~ 40 DEG C, high temperature heat source is exchanged heat with seawater for the first time, produce and start steam, the seawater for starting steam and the second effect seawater desalination system carries out heat exchange condensation as fresh water, the seawater of second effect seawater desalination system produces new steam and enters the progress heat exchange condensation of next heat exchanger, the steam of last effect and the evaporator of heat pump circulating system are exchanged heat, it is condensed into fresh water；Whole desalinization is circulated under Low Temperature Difference and completed, and heat exchange is close to Carnot cycle, and CUP values are close to 10；Steam is partly produced during other evaporation of seawater, steam and seawater are distributed in heat exchanger inner homogeneous, and quickly flowing, prevents the fouling of the internal heat tube wall of heat exchanger.
Description
Technical field
The present invention relates to low-temperature multiple-effect seawater desalination technical field, more particularly, to a kind of low-temperature multiple-effect seawater desalination system
System.
Background technology
Coastal industrial and mining enterprises are power consumption and use water rich and influential family, if these industrial and mining enterprises' low temperature heats are light in seawater
Change, both rationally make use of residual heat resources, the problem of solving shortage of fresh water again, is increased income and decreased expenditure at energy-saving and emission-reduction of can yet be regarded as
Major action.
Low temperature multiple-effect distillation (LT-MED) desalination technology refers to that the seawater of about 70 DEG C of the highest evaporating temperature of salt solution is light
Change technology, a series of Falling Film Evaporator of Horizontal Tube is together in series and is divided into some effects, is inputted and steamed with a certain amount of steam
Device is sent out, by multiple evaporation and condensation, obtains being multiple times than the distilled water of heating quantity of steam.
At present, the waste heat used in low temperature multiple-effect distillation sea water desalting technology is vapor form, i.e., produce industrial and mining enterprises
Steam directly feed sea water desalinating unit, seawater is occurred low-temperature evaporation and condensation, so as to produce fresh water.Directly utilize steam
Carrying out desalinization, to there is steam cost high, and height, which is forced down with causing to waste, sea water desalting equipment fouling tendency is relatively large etc. asks
Topic.
The content of the invention
In view of this, object of the present invention is to provide a kind of low temperature multi-effect seawater desalting system.
To achieve these goals, the present invention provides following technical scheme：A kind of low temperature multi-effect seawater desalting system, bag
Include First Heat Exchanger, the second heat exchanger, the n-th heat exchanger, the first fluid reservoir, the second fluid reservoir, the n-th fluid reservoir, choke valve, heat pump
Compressor and evaporator with heat pump, it is characterised in that：Also include First Heat Exchanger circulating pump, the circulation of the second heat exchanger, the n-th heat exchanger
It is circulating pump, the first salt solution water pump, the second salt solution water pump, the n-th salt solution water pump, the first fresh water water pump, the (n-1)th fresh water water pump, n-th light
Water water pump, brine pipeline, fresh water pipeline and pumped vacuum systems, wherein n >=2；The First Heat Exchanger heat-exchanging tube bundle is used as heat
The condenser of pump, composition heat pump circulating system is sequentially communicated with choke valve, evaporator with heat pump heat-exchanging tube bundle, heat pump compressor；Institute
State the first salt solution water pump to the n-th salt solution water pump entrance it is in parallel after be communicated in brine pipeline, its export respectively with corresponding institute
The first fluid reservoir to the n-th fluid reservoir is stated to connect；The outlet of the First Heat Exchanger circulating pump to the n-th heat exchanger circulating pump passes through pipe
Road is connected with the salt solution in corresponding first fluid reservoir to the n-th fluid reservoir, its entrance and corresponding First Heat Exchanger to the n-th heat exchange
The entrance connection of device shell；The First Heat Exchanger is connected to corresponding first to the outlet of the n-th heat exchanger shell by pipeline
Fluid reservoir is to the n-th fluid reservoir；The entrance of second heat exchanger to the n-th heat exchanger heat-exchanging tube bundle is connected to corresponding by pipeline
The top of salt solution is connected to evaporator with heat pump shell in the top of salt solution, the n-th fluid reservoir in first fluid reservoir to the (n-1)th fluid reservoir
Entrance；The outlet of second heat exchanger to the n-th heat exchanger heat-exchanging tube bundle is the outlet of condensation fresh water, and it is connected to fresh water pipe
Road；The pumped vacuum systems, pumped vacuum systems is connected with each heat exchanger and evaporator with heat pump is vacuumized respectively；The system
The desalinization course of work is：First Heat Exchanger is as the high temperature heat source of desalinization, and evaporator with heat pump is used as desalinization
Low-temperature heat source；The salt solution of desalination is needed to be respectively fed to the first fluid reservoir to the n-th liquid storage through the first salt solution water pump to the n-th salt solution water pump
Tank；Salt solution in first fluid reservoir is pumped in First Heat Exchanger shell through First Heat Exchanger circulating pump, absorbs First Heat Exchanger
The heat of heat-exchanging tube bundle inner refrigerant, part salt water evaporation is changed into steam, and the gas-fluid two-phase mixture returns the first fluid reservoir
Middle carry out gas-liquid separation, generation starts steam, starts steam and enters in the second heat exchanger heat-exchanging tube bundle and out of second fluid reservoir
The second heat exchanger shell inner salt water is pumped into through the circulation of the second heat exchanger to be exchanged heat, and starts steam exothermic condensation into fresh water；Together
When Saline Absorbent steam heat, part salt solution is evaporated to steam, the gas-fluid two-phase mixture of outflow in the second heat exchanger shell
The steam in gas-liquid separation, the second fluid reservoir is carried out into the second fluid reservoir to enter in the 3rd heat exchanger heat-exchanging tube bundle and it
Salt solution in shell is exchanged heat, and steam is condensed into fresh water, and Saline Absorbent steam heat partial gasification, one are until the (n-1)th liquid storage
Steam in tank enters in the n-th heat exchanger heat-exchanging tube bundle with being pumped into the n-th heat exchange through the circulation of the n-th heat exchanger out of n-th fluid reservoir
Salt solution is exchanged heat in device shell, and steam exothermic condensation is evaporated into fresh water, the heat of Saline Absorbent steam, part salt solution
Vapour, the gas-fluid two-phase mixture, which enters in the n-th fluid reservoir, carries out gas-liquid separation；Finally, the steam in the n-th fluid reservoir enters heat pump
Heat exchange is carried out with the refrigerant in evaporator with heat pump heat-exchanging tube bundle during heat pump cycle in evaporator shell, steam heat release is cold
Congeal into fresh water.
Further, jth fresh water water pump is additionally provided between the outlet of the jth heat exchanger heat-exchanging tube bundle and fresh water pipeline,
Jth fresh water water pump provides to the steam of the fluid reservoir of jth -1 and takes out pressure, makes it into jth heat exchanger, wherein j=2 ~ n-1；Heat pump steams
The n-th fresh water water pump is provided between the water outlet and fresh water pipeline of sending out device shell.
Further, wastewater outlet is additionally provided with i-th fluid reservoir, for discharging the high salt concentration by repeatedly evaporating
Water, wherein i=1 ~ n.
Further, the wastewater outlet source of i-th fluid reservoir connects the i-th waste water pump entrance, and the i-th waste water water is pumped out
Mouth is connected to waste water tunnel, wherein i=1 ~ n.
Further, the turnover waste water of control waste water is respectively equipped between each waste water exit of pump and waste pipe
Stop valve.
Further, the turnover that control fresh water is respectively equipped between the outlet of each fresh water water pump and fresh water pipeline is light
Water stop valve.
Further, it is provided with the i-th water level detecting equipment in i-th fluid reservoir, the i-th water level detecting equipment is used to detecting the
The height of i fluid reservoir maritime interior waters, wherein i=1 ~ n.
Further, it is provided with the i-th concentration detection device in i-th fluid reservoir, the i-th concentration detection device is used to detecting the
The concentration of i concentration detection device maritime interior waters, when the concentration of the i-th concentration detection device maritime interior waters reaches certain value, passes through waste water
High concentration seawater in outlet emptying fluid reservoir, wherein i=1 ~ n.
Further, i-th heat exchanger and evaporator with heat pump use shell and tube exchanger, wherein i=1 ~ n.
The beneficial effect brought of technical scheme that embodiments of the invention are provided is：Utilize the condenser of heat pump circulating system
（First Heat Exchanger）As the high temperature heat source of desalinization, the evaporator of heat pump circulating system as desalinization Low Temperature Thermal
The temperature difference of source, high temperature heat source and low-temperature heat source is between 30 DEG C ~ 40 DEG C, and high temperature heat source is exchanged heat with seawater for the first time, and generation is opened
Dynamic steam, starting the seawater progress heat exchange condensation of steam and the second effect seawater desalination system turns into fresh water, and the second effect seawater is light
The seawater of change system produces new steam and enters the progress heat exchange condensation of next heat exchanger, the steam and heat pump cycle of last effect
The evaporator of system is exchanged heat, and is condensed into fresh water；Whole desalinization is circulated under Low Temperature Difference and completed, and heat exchange is followed close to Kano
Ring, CUP values are close to 10；Steam is partly produced during other evaporation of seawater, steam and seawater are distributed in heat exchanger inner homogeneous,
Quickly flowing, prevents the fouling of the internal heat tube wall of heat exchanger.
Brief description of the drawings
Fig. 1 seawater desalination system structural representations of the present invention.
Fig. 2 is the structural representation of fluid reservoir in Fig. 1.
In figure：1st, evaporator with heat pump；2nd, heat pump compressor；31st, First Heat Exchanger；32nd, the second heat exchanger；3n, the n-th heat exchange
Device；4th, choke valve；51st, the first fluid reservoir；52nd, the second fluid reservoir；5n, the n-th fluid reservoir；61st, First Heat Exchanger circulating pump；62、
Second heat exchanger circulating pump；6n, the n-th heat exchanger circulating pump；71st, the first salt solution water pump；72nd, the second salt solution water pump；7n, the n-th salt
Water water pump；81st, the first fresh water water pump；8n-1, the (n-1)th fresh water water pump；8n, the n-th fresh water water pump；91st, the first waste water water pump；92、
Second waste water water pump；9n, the n-th waste water water pump；101st, the first water level detecting equipment；102nd, the second water level detecting equipment；10n, n-th
Water level detecting equipment；111st, the first concentration detection device；112nd, the second concentration detection device；11n, the n-th concentration detection device；
12nd, seawater water pump；13rd, sea water preprocessing equipment；14th, brine pipeline；15th, waste pipe；16th, fresh water pipeline；17th, vavuum pump；
181st, the stop valve of vacuum pump inlet first；182nd, the stop valve of vacuum pump inlet second；18n, the stop valve of vacuum pump inlet n-th；18n
+ 1, the stop valve of vacuum pump inlet (n+1)th；191st, the first fresh water stop valve；19n-1, the (n-1)th fresh water stop valve；19n, the n-th fresh water
Stop valve；201st, the first waste water stop valve；202nd, the second waste water stop valve；20n, the n-th waste water stop valve；21st, salt solution stop valve.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is further described.
Referring to Fig. 1, the invention provides a kind of low temperature multi-effect seawater desalting system, including heat pump circulating system and
Multi-effect evaporation system.
Heat pump circulating system includes First Heat Exchanger 31 (heat pump condenser), the refrigeration of the heat-exchanging tube bundle of First Heat Exchanger 31
Agent outlet is connected with the high pressure entry of choke valve 4, the low tension outlet of choke valve 4 and the refrigeration of the heat-exchanging tube bundle of evaporator with heat pump 1
Agent entrance is connected, and the refrigerant outlet of the heat-exchanging tube bundle of evaporator with heat pump 1 is connected with the entrance of heat pump compressor 2, heat pump pressure
The outlet of contracting machine 2 is connected with the refrigerant inlet of the heat-exchanging tube bundle of First Heat Exchanger 31, so constitutes heat pump circulating system, heat pump
The working medium of circulatory system inner loop is any one in R22, R134a or R410a.
Multi-effect evaporation system include by 31 ~ 3n of heat exchanger, evaporator with heat pump 1,51 ~ 5n of fluid reservoir, heat exchanger circulating pump 61 ~
6n, 71 ~ 7n of salt solution water pump, 81 ~ 8n of fresh water water pump, 91 ~ 9n of waste water water pump, seawater water pump 12, sea water preprocessing equipment 13, salt solution
Pipeline 14, waste pipe 15, fresh water pipeline 16,191 ~ 19n of fresh water stop valve, 201 ~ 20n of waste water stop valve and salt solution cut-off
The first of the composition of valve 21 imitates vapo(u)rization system to the n-th effect vapo(u)rization system；Wherein n is greater than 1 integer.
31 ~ the 3n of heat exchanger and evaporator with heat pump 1 use shell and tube exchanger；51 ~ the 5n of fluid reservoir be used for pair
Gas-liquid separation and storage are carried out into the material in fluid reservoir, 51 ~ 5n of fluid reservoir there are five external-connected ports, referring to Fig. 2, storage
51 ~ 5n of flow container five external-connected ports are respectively e1, e2, e3, e4, e5.
71 ~ 7n of salt solution water pump entrance is connected to brine pipeline 14, and it is exported by pipeline and corresponding storage
51 ~ 5n of flow container e5 ports connection.
91 ~ 9n of waste water water pump entrance is connected to 51 ~ 5n of correspondence fluid reservoir e4 ports by pipeline, passes through
The pipe end of e4 ports is located at the bottom of liquid in 51 ~ 5n of fluid reservoir, can realize and the liquid inside 51 ~ 5n of fluid reservoir is entered
Row emptying, 91 ~ 9n of waste water water pump outlets are respectively equipped with 201 ~ 20n of corresponding waste water stop valve, and 201 ~ 20n's of waste water stop valve is another
One end is connected with waste pipe 15.
61 ~ 6n of heat exchanger circulating pump entrance is connected to corresponding 51 ~ 5n of fluid reservoir e3 ports by pipeline, wears
The pipe end for crossing e3 ports is located at the bottom of liquid in 51 ~ 5n of fluid reservoir, and 61 ~ 6n of heat exchanger circulating pump outlet passes through pipeline
Connected with the entrance of corresponding 31 ~ 3n of heat exchanger shells, so form 61 ~ 6n of heat exchanger circulating pump, heat exchanger 31 ~ 3n shells
With 51 ~ 5n of fluid reservoir salt solution heat exchange partial circulating.
The outlet of 31 ~ 3n of heat exchanger shells is connected to 51 ~ 5n of fluid reservoir e2 ports by pipeline；Heat exchanger 32 ~
The entrance of 3n heat-exchanging tube bundles is connected to 51 ~ 5n-1 of fluid reservoir e1 ports by pipeline, and the n-th fluid reservoir 5n e1 ports are connected to
The entrance of the shell of evaporator with heat pump 1；Pipe end through fluid reservoir e1 ports is located at the top of liquid in 51 ~ 5n of fluid reservoir.
81 ~ 8n of fresh water water pump outlet is connected with fresh water 191 ~ 19n of stop valve, and 191 ~ 19n's of fresh water stop valve is another
One end is connected to fresh water pipeline 16, and 81 ~ 8n-1 of fresh water water pump entrance is connected to going out for corresponding 32 ~ 3n of heat exchanger heat-exchanging tube bundles
Mouthful；N-th fresh water water pump 8n entrance is connected to the outlet of the shell of evaporator with heat pump 1.
Be equipped with the 51 ~ 5n of fluid reservoir 101 ~ 10n of corresponding water level detecting equipment and concentration detection device 111 ~
11n；101 ~ 10n of water level detecting equipment is used for the height for detecting salt solution in 51 ~ 5n of fluid reservoir, and salt solution water is passed through according to setting value
71 ~ 7n of pump carries out the amount of salt solution in 51 ~ 5n of supplement fluid reservoir；111 ~ 11n of concentration detection device is used to detect in 51 ~ 5n of fluid reservoir
The concentration of salt solution, when the concentration of salt solution in 51 ~ 5n of fluid reservoir reaches certain value, 91 ~ 9n of waste water water pump and waste water stop valve 201
~ 20n is opened, the strong brine in 51 ~ 5n of emptying fluid reservoir.
31 ~ the 3n of heat exchanger and evaporator with heat pump 1, which also leave one, is used for the exit passageway that vacuumizes, and heat exchanger 31 ~
3n exit passageway is connected with vacuum pump inlet stop valve 181 ~ 18n entrances respectively, the exit passageway and vacuum of evaporator with heat pump 1
Pump intake stop valve 18n+1 entrances are connected, and 181 ~ 18n+1 of vacuum pump inlet stop valve outlet is connected with the entrance of vavuum pump 17,
The outlet of vavuum pump is connected with air.
Salt solution stop valve 21, sea water preprocessing equipment 13 and seawater water are sequentially provided between the brine pipeline 14 and seawater
Pump 12, seawater water pump 12 is from big marine extracting seawater feeding sea water preprocessing equipment 13, and sea water preprocessing equipment 13 is entered to seawater
Row pretreatment, the large granular impurity filtered out in seawater draws salt solution, and desalinization is carried out for seawater desalination system.
Using seawater desalination system provided in an embodiment of the present invention when in use：
Heat pump cycle process：Refrigerant is compressed into high temperature and high pressure gas in heat pump compressor 3, is changed into First Heat Exchanger 31
In heat pipe bundle, then exchanged heat with the salt solution in the shell of First Heat Exchanger 31, refrigerant heat release is condensed into liquid through throttling
The puffing of valve 4 enters in the heat-exchanging tube bundle of evaporator with heat pump 1, and the refrigerant suction heat pump in the heat-exchanging tube bundle of evaporator with heat pump 1 steams
The heat of steam turns into steam and returns to heat pump compressor 2 in the hair shell of device 1, so as to complete kind of refrigeration cycle.
Desalting process：Seawater water pump 12, seawater water pump 12 sends into sea water preprocessing equipment from big marine extracting seawater
13, sea water preprocessing equipment 13 is pre-processed to seawater, and the large granular impurity filtered out in seawater obtains salt solution；Salt solution water pump
71 ~ 7n is constantly extracted by sea water preprocessing equipment by brine pipeline 14 according to 101 ~ 10n of water level detecting equipment instruction
In 13 obtained salt solution, 51 ~ 5n of feeding fluid reservoir；First Heat Exchanger circulating pump 61 extracts the salt solution feeding in the first fluid reservoir 51
Exchanged heat in the shell of First Heat Exchanger 31 with the heat-exchanging tube bundle inner refrigerant of First Heat Exchanger 31, the heat that absorption refrigeration agent is released
Amount, part salt water evaporation is changed into steam, and the gas-fluid two-phase mixture, which enters, carries out gas-liquid separation in the first fluid reservoir 51, the first storage
Steam in flow container 51 enters in the heat-exchanging tube bundle of the second heat exchanger 32 under pressure in taking out for the first fresh water water pump 81, the second heat exchanger
The salt solution that circulating pump 62 is extracted in the second fluid reservoir 52 is sent into the shell of the second heat exchanger 32 and the heat-exchanging tube bundle of the second heat exchanger 32
Interior steam is exchanged heat, and steam exothermic condensation sends into fresh water pipeline 16 into fresh water through the first fresh water water pump 81（Complete for the first time
Fresh water output）, while the heat of Saline Absorbent steam, part salt solution is evaporated to steam, then the gas-fluid two-phase mixture enters
Gas-liquid separation is carried out in second fluid reservoir 52, the salt solution that steam enters in next heat exchanger heat-exchanging tube bundle and in shell is carried out
Heat exchange, by that analogy, the steam taken out through the n-1 of the (n-1)th fresh water water pump 8 in pressure, previous fluid reservoir enter the n-th heat exchanger 3n
In heat-exchanging tube bundle, while the salt solution that the n-th heat exchanger circulating pump 6n is extracted in the n-th fluid reservoir 5n is sent into the n-th heat exchanger 3n shells
Exchanged heat with the steam in the n-th heat exchanger 3n heat-exchanging tube bundles, steam exothermic condensation is into fresh water, through the n-1 of the (n-1)th fresh water water pump 8
Send into fresh water pipeline 16（Complete (n-1)th fresh water output）, while the heat of Saline Absorbent steam, part salt solution is evaporated to
Vapour, the gas-fluid two-phase mixture, which enters, carries out steam in gas-liquid separation, the n-th fluid reservoir 5n through the n-th fresh water in the n-th fluid reservoir 5n
The n of water pump 8 takes out pressure into the interior refrigeration with the heat-exchanging tube bundle of evaporator with heat pump 1 during heat pump cycle of the shell of evaporator with heat pump 1
Steam exothermic condensation in agent progress heat exchange, the shell of evaporator with heat pump 1 sends into fresh water pipe into fresh water through the n of the n-th fresh water water pump 8
Road 16（Complete n-th fresh water output）, so as to complete desalting process.
In addition, in desalting process, 111 ~ 11n of concentration detection device constantly detects salt solution in 51 ~ 5n of fluid reservoir
Concentration, when the concentration of salt solution in 51 ~ 5n of fluid reservoir reaches certain value, 91 ~ 9n of waste water water pump and 201 ~ 20n of waste water stop valve are opened
Open, the strong brine in 51 ~ 5n of emptying fluid reservoir, then 71 ~ 7n of salt solution water pump is extracted by brine pipeline 14 and located in advance by seawater
The salt solution that reason equipment 13 is obtained, is added in 51 ~ 5n of fluid reservoir.
With reference to Fig. 1, the carrying out practically process to seawater desalination system of the present invention is further described：
First, vacuumized, close 191 ~ 19n of fresh water stop valve, 201 ~ 20n of waste water stop valve and salt solution stop valve 21, beat
Vacuum pump inlet 181 ~ 18n+1 of stop valve is opened, vavuum pump 17 is opened, heat pump refrigeration cycle system and multi-effect evaporation system is evacuated to
The vacuum set, 181 ~ 18n+1 of vacuum pump inlet stop valve is used to control the air pressure in often effect vapo(u)rization system, fresh water cut-off
191 ~ 19n of valve, 201 ~ 20n of waste water stop valve and salt solution stop valve 21 control the turnover of fresh water, waste water and salt solution respectively.
Exhaust after vacuum, close vacuum pump inlet 181 ~ 18n+1 of stop valve, turn off vavuum pump 17, be then turned on seawater
Water pump 12, seawater water pump 12 is from big marine extracting seawater feeding sea water preprocessing equipment 13, and sea water preprocessing equipment 13 is to seawater
Pre-processed, the large granular impurity filtered out in seawater draws salt solution.71 ~ 7n of salt solution water pump and salt solution stop valve 21 are opened,
71 ~ 7n of salt solution water pump extracts the salt solution obtained by sea water preprocessing equipment 13,51 ~ 5n of feeding fluid reservoir by brine pipeline 14
It is interior.Heat pump compressor 3 is opened, heat exchanger 61 ~ 6n of circulating pump is opened, 61 ~ 6n of heat exchanger circulating pump is extracted in 51 ~ 5n of fluid reservoir
In salt solution feeding heat exchanger 31 ~ 3n shells, in First Heat Exchanger 31, salt solution and the first heat exchange in the shell of First Heat Exchanger 31
Refrigerant in the heat-exchanging tube bundle of device 31 is exchanged heat, in 32 ~ 3n of heat exchanger, salt solution and heat exchange in heat exchanger 32 ~ 3n shells
Steam is exchanged heat in device 32 ~ 3n heat-exchanging tube bundles, and then gas-fluid two-phase mixture, which is admitted in 51 ~ 5n of feeding fluid reservoir, enters promoting the circulation of qi
Liquid is separated；81 ~ 8n of fresh water water pump and fresh water 191 ~ 19n of stop valve is opened, 81 ~ 8n-1 of fresh water water pump extracts 51 ~ 5n-1 of fluid reservoir
Interior steam enters in heat exchanger 31 ~ 3n heat-exchanging tube bundles, and steam is managed in 31 ~ 3n of heat exchanger heat-exchanging tube bundles with 31 ~ 3n of heat exchanger
Salt solution carries out heat exchange in shell, and steam exothermic condensation sends into fresh water pipeline 16, while n-th into fresh water by 81 ~ 8n-1 of fresh water water pump
The steam that fresh water water pump 8n is extracted in fluid reservoir 5n enters in the shell of evaporator with heat pump 1, in the heat-exchanging tube bundle of evaporator with heat pump 1
Steam exothermic condensation in refrigerant progress heat exchange, the shell of evaporator with heat pump 1 is sent into light into fresh water through the n of the n-th fresh water water pump 8
Waterpipe 16.
Herein, the involved noun of locality such as forward and backward, upper and lower is to be located at parts in accompanying drawing in figure and zero
The position of part each other is intended merely to the clear of expression technology scheme and conveniently come what is defined.It should be appreciated that the noun of locality
Use should not limit the claimed scope of the application.In the case where not conflicting, embodiment and embodiment herein-above set forth
In feature can be combined with each other.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (9)
1. a kind of low temperature multi-effect seawater desalting system, including First Heat Exchanger, the second heat exchanger, the n-th heat exchanger, the first liquid storage
Tank, the second fluid reservoir, the n-th fluid reservoir, choke valve, heat pump compressor and evaporator with heat pump, it is characterised in that：Also changed including first
Hot device circulating pump, the circulation of the second heat exchanger, the n-th heat exchanger circulating pump, the first salt solution water pump, the second salt solution water pump, the n-th salt solution water
Pump, the first fresh water water pump, the (n-1)th fresh water water pump, the n-th fresh water water pump, brine pipeline, fresh water pipeline and pumped vacuum systems, its
Middle n >=2；The First Heat Exchanger heat-exchanging tube bundle as heat pump condenser, with choke valve, evaporator with heat pump heat-exchanging tube bundle, heat
Pump compressor is sequentially communicated composition heat pump circulating system；After the entrance of the first salt solution water pump to the n-th salt solution water pump is in parallel
Brine pipeline is communicated in, its outlet is connected with corresponding first fluid reservoir to the n-th fluid reservoir respectively；The First Heat Exchanger
The outlet of circulating pump to the n-th heat exchanger circulating pump is connected by pipeline with the salt solution in corresponding first fluid reservoir to the n-th fluid reservoir
Logical, its entrance is connected with the entrance of corresponding First Heat Exchanger to the n-th heat exchanger shell；The First Heat Exchanger to n-th heat exchange
The outlet of device shell is connected to corresponding first fluid reservoir to the n-th fluid reservoir by pipeline；Second heat exchanger to n-th heat exchange
The entrance of device heat-exchanging tube bundle is connected to the top of salt solution in corresponding first fluid reservoir to the (n-1)th fluid reservoir, the n-th storage by pipeline
The top of salt solution is connected to the entrance of evaporator with heat pump shell in flow container；Second heat exchanger goes out to the n-th heat exchanger heat-exchanging tube bundle
Mouth is the outlet of condensation fresh water, and it is connected to fresh water pipeline；The pumped vacuum systems, pumped vacuum systems is changed with each respectively
Hot device and evaporator with heat pump connection is vacuumized；The system desalinization course of work is：First Heat Exchanger is light as seawater
The high temperature heat source of change, evaporator with heat pump as desalinization low-temperature heat source；Need desalination salt solution through the first salt solution water pump extremely
N-th salt solution water pump is respectively fed to the first fluid reservoir to the n-th fluid reservoir；Salt solution in first fluid reservoir is through First Heat Exchanger circulating pump
Pump in First Heat Exchanger shell, absorb the heat of First Heat Exchanger heat-exchanging tube bundle inner refrigerant, part salt water evaporation is changed into
Steam, the gas-fluid two-phase mixture returns and gas-liquid separation is carried out in the first fluid reservoir, produces and starts steam, starts steam and enters
With being pumped into the second heat exchanger shell inner salt through the circulation of the second heat exchanger out of second fluid reservoir in second heat exchanger heat-exchanging tube bundle
Water is exchanged heat, and starts steam exothermic condensation into fresh water；While the heat of Saline Absorbent steam, part salt solution is evaporated to steam,
The gas-fluid two-phase mixture of outflow enters in second heat exchanger shell is carried out in gas-liquid separation, the second fluid reservoir in the second fluid reservoir
Steam enter in the 3rd heat exchanger heat-exchanging tube bundle and exchanged heat with the salt solution in its shell, steam is condensed into fresh water, salt solution
Absorb steam heat partial gasification, one until the steam in the (n-1)th fluid reservoir enter in the n-th heat exchanger heat-exchanging tube bundle with from n-th
The n-th heat exchanger shell inner salt water is pumped into through the circulation of the n-th heat exchanger in fluid reservoir to be exchanged heat, steam exothermic condensation into fresh water,
The heat of Saline Absorbent steam, part salt solution is evaporated to steam, and the gas-fluid two-phase mixture, which enters in the n-th fluid reservoir, carries out gas-liquid
Separation；Finally, the steam in the n-th fluid reservoir enters in evaporator with heat pump shell and evaporator with heat pump exchanges heat during heat pump cycle
Refrigerant in tube bank carries out heat exchange, and steam exothermic condensation is into fresh water.
2. a kind of low temperature multi-effect seawater desalting system according to claim 1, it is characterised in that the jth heat exchanger is changed
Jth fresh water water pump is additionally provided between the outlet of heat pipe bundle and fresh water pipeline, jth fresh water water pump is carried to the steam of the fluid reservoir of jth -1
For taking out pressure, jth heat exchanger, wherein j=2 ~ n-1 are made it into；Between the water outlet and fresh water pipeline of evaporator with heat pump shell
Provided with the n-th fresh water water pump.
3. a kind of low temperature multi-effect seawater desalting system according to claim 1, it is characterised in that on i-th fluid reservoir
Wastewater outlet is additionally provided with, for discharging the high concentration salt solution by repeatedly evaporating, wherein i=1 ~ n.
4. a kind of low temperature multi-effect seawater desalting system according to claim 3, it is characterised in that i-th fluid reservoir
Wastewater outlet source connects the i-th waste water pump entrance, and the i-th waste water exit of pump is connected to waste water tunnel, wherein i=1 ~ n.
5. a kind of low temperature multi-effect seawater desalting system according to claim 4, it is characterised in that each waste water water pump
The turnover waste water stop valve of control waste water is respectively equipped between outlet and waste pipe.
6. a kind of low temperature multi-effect seawater desalting system according to claim 2, it is characterised in that each fresh water water pump
Outlet and fresh water pipeline between be respectively equipped with control fresh water turnover fresh water stop valve.
7. a kind of low temperature multi-effect seawater desalting system according to claim 1, it is characterised in that in i-th fluid reservoir
Provided with the i-th water level detecting equipment, the i-th water level detecting equipment is used for the height for detecting the i-th fluid reservoir maritime interior waters, wherein i=1 ~ n.
8. a kind of low temperature multi-effect seawater desalting system according to claim 1, it is characterised in that in i-th fluid reservoir
Provided with the i-th concentration detection device, the i-th concentration detection device is used for the concentration for detecting the i-th concentration detection device maritime interior waters, when i-th
When the concentration of concentration detection device maritime interior waters reaches certain value, the high concentration seawater in fluid reservoir is emptied by wastewater outlet, its
Middle i=1 ~ n.
9. a kind of low temperature multi-effect seawater desalting system according to claim 1, it is characterised in that i-th heat exchanger and
Evaporator with heat pump uses shell and tube exchanger, wherein i=1 ~ n.
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| CN201710268410.8A CN107010684A (en) | 2017-04-22 | 2017-04-22 | A kind of low temperature multi-effect seawater desalting system |
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| CN201710268410.8A CN107010684A (en) | 2017-04-22 | 2017-04-22 | A kind of low temperature multi-effect seawater desalting system |
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| CN107032426A (en) * | 2017-04-22 | 2017-08-11 | 祝长宇 | A kind of low temperature multi-effect seawater desalting system |
| CN109626465A (en) * | 2019-02-19 | 2019-04-16 | 周林枫 | A kind of apparatus for evaporation condensation |
| CN111056581A (en) * | 2020-01-08 | 2020-04-24 | 浙江工业大学 | Two-stage compression heat pump seawater desalination device with freezing and evaporating combined action |
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