CN104891593A - High-desalting-rate seawater desalination method and device based on liquefied natural gas cold energy - Google Patents
High-desalting-rate seawater desalination method and device based on liquefied natural gas cold energy Download PDFInfo
- Publication number
- CN104891593A CN104891593A CN201510309752.0A CN201510309752A CN104891593A CN 104891593 A CN104891593 A CN 104891593A CN 201510309752 A CN201510309752 A CN 201510309752A CN 104891593 A CN104891593 A CN 104891593A
- Authority
- CN
- China
- Prior art keywords
- ice
- seawater
- natural gas
- secondary refrigerant
- centrifugal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Abstract
The invention discloses a high-desalting-rate seawater desalination method based on liquefied natural gas cold energy, which comprises the following steps: sufficiently carrying out indirect heat exchange on liquefied natural gas and a gas-state secondary coolant, and sufficiently carrying out indirect heat exchange on the obtained liquid-state secondary coolant and seawater to obtain ice and concentrated seawater; (2) taking the ice obtained in the step (1), standing under atmospheric pressure until the melting rate of ice is 10-50%, recovering the liquid, and taking the residual ice for later use; (3) crushing the residual ice obtained in the step (2) to obtain ice crystal granules, centrifuging, recovering the liquid, and taking the ice crystal granules for later use; and (4) completely melting the ice crystal granules obtained in the step (3). The invention also discloses a seawater desalination plant based on liquefied natural gas cold energy. The method utilizes the cold energy released in the liquefied natural gas gasification process, comprehensively utilizes the freeze desalting, gravity desalting and centrifuging desalting techniques, has the advantages of simple steps, energy saving and environment friendliness, and enhances the seawater desalting rate on the basis of freeze desalting.
Description
Technical field
The present invention relates to the crossing domain of Oil & Gas Storage, Engineering Thermophysics and water technology, be specifically related to a kind of equipment with high desalinization method for desalting seawater based on cold energy of liquefied natural gas and device.
Background technology
LNG (Liquefied Natural Gas natural gas liquids) is the liquify natural gas under normal pressure, low temperature (-162 DEG C), before entering Cemented filling, as fuel or industrial chemicals, need, by using after gasifier gasification, during LNG gasification, 830kJ/kg cold energy can be released in theory.Imported L NG receiving station generally build near harbour, and the cold energy of LNG gasification release is directly discharged in seawater usually, and along with the continuous expansion of receiving station's scale, a large amount of cold energy forms impact to the ecotope of surrounding waters.If this part cold energy can be used for sea water desaltination, then there are following many benefits: alleviate the impact of LNG gasification on harbour surrounding waters ecotope; Reduce the cost of cold method sea water desaltination; There is energy-conservation, economize on water, reduce carbon emission, comprehensive energy utilization resource meaning.
Cold method desalination is as one of the method for sea water desaltination, low-temperature receiver can adopt natural cold source and artificial cold source, the former limit by geographic climate, is difficult to heavy industrialization and adopts, and the latter needs to consume a large amount of energy (process of refrigeration often needs to consume high-grade electric energy).In addition, more crucially simple cold method is compared with hot method (as low-temperature multiple-effect distillation etc.) with embrane method (as reverse osmosis membrane), and its ratio of desalinization is lower, therefore fails to become the method for desalting seawater of main flow.
Along with Sweet natural gas the increasing substantially of proportion in China's primary energy source consumption structure, coastland imported L NG harbour development rapidly, the gasify huge cold energy that discharges of LNG can provide the free low-temperature receiver of not climate condition restriction for freeze desalting process, and this sea water desaltination be employing cold method carries out heavy industrialization provides the opportunity of development.
Even if imported L NG receiving station can for the low-temperature receiver adopting cold method sea water desaltination to provide low cost, still need to solve the low problem of simple cold method ratio of desalinization, otherwise will obtain supplying industrial and agricultural production and civilian fresh water, the cost of aftertreatment is very high.Therefore, on the basis of freeze desalination, an enterprising step-down low salt concn, increases cost and energy consumption simultaneously with exceeding, and is to realize utilizing LNG cold energy to carry out the problem of Seawater Desalination Industrialization needs solution.
Patent documentation CN102583848A " seawater desalination system and method thereof based on liquify natural gas cold energy " and patent documentation CN101628740A " utilizes the direct contact refrigeration method for desalting seawater of cold energy of liquefied natural gas ", all have employed the ice-making plant that secondary refrigerant directly contacts with seawater, although heat exchange efficiency is higher, there is the problem needing to be separated with ice crystal by secondary refrigerant, ice crystal washs and simple cold method ratio of desalinization is low.
Patent documentation CN101624224A " what utilize cold energy of liquefied natural gas has phase transformation indirect refrigeration method for desalting seawater " and patent documentation CN101628741A " utilize cold energy of liquefied natural gas without phase transformation indirect refrigeration method for desalting seawater ", although have employed the method for secondary refrigerant and the ice making of seawater indirect heat exchange, do not need separated secondary refrigerant and ice, but still belong to simple cold method sea water desalinization technology, the problem that ratio of desalinization is low cannot be solved.
Summary of the invention
The present invention is intended to overcome defect of the prior art, make full use of a large amount of cold energy that LNG gasification discharges, cold method is adopted to reach the elementary desalination of seawater, and fully utilize lower-cost gravity desalinization and centrifugal desalting technology on this basis, obtain the Freshwater resources that can meet part industrial and agricultural production or civilian requirement through secondary and three grades of desalinations, reduce the cost of aftertreatment to greatest extent.
The first object of the present invention is to provide a kind of equipment with high desalinization method for desalting seawater based on cold energy of liquefied natural gas.
Specifically, said method comprising the steps of:
(1) seawater that original salt concn is 3 ~ 3.5% is got; Natural gas liquids and gaseous state secondary refrigerant are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid secondary refrigerant, more described liquid secondary refrigerant and described seawater is fully carried out indirect heat exchange, obtain gaseous state secondary refrigerant and ice and concentrated seawater; After being separated by frozen water, reclaim concentrated seawater, ice is for subsequent use;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 10 ~ 50%, recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal under 2000 ~ 8000rpm condition, recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is melted completely.
Salt of the present invention is sodium-chlor.The original salt concn of described seawater is 3 ~ 3.5%, is preferably 3%.
Step of the present invention (1) described indirect heat exchange specifically refers to: the heat transfer process that the natural gas liquids participating in heat exchange carries out when directly not contacting with seawater with gaseous state secondary refrigerant and liquid secondary refrigerant.Indirect heat exchange of the present invention should fully carry out, and guarantees exchanged energy fully for the cooling freezing process of seawater.
Described secondary refrigerant selects transformation temperature under stable, nontoxic, operating pressure to meet Single Medium or the blending agent of system requirements, is preferably propane or R410a refrigeration agent, more preferably R410a refrigeration agent.
After step (1) process, the salt concn in gained ice is preferably 35 ~ 60% of the original salt concn of seawater.
Step of the present invention (1), the basis making full use of the energy realizes preliminary desalting effect.
The principle of step of the present invention (2) is gravity desalinization, carries out at ambient pressure.All can implement under the temperature condition that this step can be melted at ice.The present invention is on the basis processed through step (1), and step (2), by reasonably controlling the thawing degree of ice in gravity desalinization process and then indirectly controlling ratio of desalinization, guarantees that technical scheme is saved energy consumption, is easy to realize simultaneously.In order to improve separation efficiency and save energy consumption, the present invention preferably realizes the separation of frozen water while leaving standstill.
After step of the present invention (3) described fragmentation, the particle diameter of crystal ice granule should be less than the diameter of institute saliferous born of the same parents in ice.Sufficient fragmentation can make salt born of the same parents contained in ice broken, and by filter centrifugation, salt is fully separated with ice.In order to realize best centrifugal desalination effect, described centrifugal preferably centrifugal 3 ~ 5min under 3000 ~ 5000rpm condition.In order to improve separation efficiency and save energy consumption, the present invention preferably realizes the separation of frozen water while centrifugal.
As a preferred embodiment of the present invention, said method comprising the steps of:
(1) seawater that original salt concn is 3 ~ 3.5% is got; Natural gas liquids and gaseous state secondary refrigerant are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid secondary refrigerant, more described liquid secondary refrigerant and described seawater is fully carried out indirect heat exchange, obtain gaseous state secondary refrigerant, and ice and concentrated seawater; After frozen water is separated, reclaim concentrated seawater, ice is for subsequent use;
In ice, the concentration of salt is 35 ~ 40% of the original salt concn of seawater;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 45 ~ 50%, while leaving standstill, frozen water is separated; Recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal 3 ~ 5min under 3000 ~ 3500rpm condition, while centrifugal, make frozen water be separated; Recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is melted completely.
The program by the treatment condition system of each step with optimize, fully reducing costs, energy consumption, reduction of discharging environmental protection basis on, ratio of desalinization can be increased to more than 99%.
As another kind of preferred version of the present invention, said method comprising the steps of:
(1) seawater that original salt concn is 3 ~ 3.5% is got; Natural gas liquids and gaseous state secondary refrigerant are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid secondary refrigerant, more described liquid secondary refrigerant and described seawater is fully carried out indirect heat exchange, obtain gaseous state secondary refrigerant, and ice and concentrated seawater; After frozen water is separated, reclaim concentrated seawater, ice is for subsequent use;
In ice, the concentration of salt is 55 ~ 60% of the original salt concn of seawater;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 35 ~ 40%, while leaving standstill, frozen water is separated; Recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal 3 ~ 5min under 4500 ~ 5000rpm condition, while centrifugal, make frozen water be separated; Recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is melted completely.
The program by controlling the treatment condition of each step and optimizing, fully reducing costs, energy consumption, reduction of discharging environmental protection basis on, comparatively equipment with high desalinization can be realized, obtain higher fresh-water recovery rate simultaneously.
Thawing rate of the present invention refers to: the per-cent of ice quality before the ice melted accounts for and melts.
Ratio of desalinization of the present invention refers to: after process, in gained water, the concentration of salt accounts for the per-cent of the original salt concn of seawater.
Method provided by the invention utilizes LNG cold energy as the low cost low-temperature receiver of preliminary freeze desalination, on this basis, using gravity desalinization as secondary desalination, using centrifugal desalination as three grades of desalinations, and by being optimized the parameter of de-salting operation at different levels, the balance achieving equipment with high desalinization and reduce engineering cost, save energy consumption, be convenient to the factors such as enforcement, has extremely strong commercial introduction and is worth.
The second object of the present invention is to provide a kind of equipment with high desalinization sea water desalinating plant based on cold energy of liquefied natural gas.
Described device comprises the centrifugal desalination system of salt water supply system, seawater freezing and gravity and fresh-water system that are linked in sequence.Described device also comprises liquefied natural gas gasifying system for described seawater freezing energy supply and the secondary refrigerant phase transformation recycle system.
Described seawater freezing and the centrifugal desalination system of gravity are the core of device of the present invention, comprise the ice-making machine, frozen water separator, gravity desalinization groove, ice crusher and the centrifugal desalting plant of filtering type that are linked in sequence.
Indirect heat exchanger is comprised in described ice-making machine; The side of described indirect heat exchanger is the secondary refrigerant phase transformation recycle system, and opposite side is seawater distribution device and mechanical deicing's device.Described indirect heat exchanger can realize the indirect heat exchange between liquid secondary refrigerant medium and seawater.
In order to realize efficient desalination, simplify treatment step, in seawater freezing of the present invention and the centrifugal desalination system of gravity, travelling belt for transporting ice all preferably can make the pore texture of frozen water natural separation, makes thawing in the process of transport ice obtain minute quantity moisture and is directly separated with ice.
Described liquefied natural gas gasifying system provides energy for described seawater freezing.This system comprises secondary refrigerant condenser; Described secondary refrigerant condenser is the low temperature resistant indirect type interchanger of high pressure, can adopt interchanger that is board-like, the type such as plate-fin, shell-and-tube.
The side of described secondary refrigerant condenser is Sweet natural gas Phase Transition Systems; The inlet end of described Sweet natural gas Phase Transition Systems is connected with the storage tank in natural gas liquids receiving station, and exit end is connected with natural gas transport pipe network.Natural gas liquids enters secondary refrigerant condenser after pressurization, being gaseous natural gas, exporting natural gas transport pipe network to by absorbing the heat gasification of gaseous state secondary refrigerant.The opposite side of described secondary refrigerant condenser is the secondary refrigerant phase transformation recycle system.
The described secondary refrigerant phase transformation recycle system is circulation path; From secondary refrigerant condenser in the stage of indirect heat exchanger, comprise container for storing liquid, secondary refrigerant pump and reverse checkvalve that order is connected.Secondary refrigerant medium containing circulating phase-change in the described secondary refrigerant phase transformation recycle system; Liquid secondary refrigerant media storage is in container for storing liquid, through the side of secondary refrigerant pump input indirect heat exchanger, gaseous state is transformed into after absorbing the heat in seawater, circulation enters secondary refrigerant condenser, be transformed into liquid state after the heat absorbed from seawater being passed to natural gas liquids wherein, so circulate; Described reverse checkvalve can prevent the secondary refrigerant medium counter flow of gaseous state in container for storing liquid.Above-mentioned working cycle can pass through the circulating phase-change transferring heat carried out continuously between ice-making machine and secondary refrigerant condenser, achieves making full use of of the energy.
In the actual moving process of described seawater freezing and the centrifugal desalination system of gravity, seawater is uniformly distributed in the surface of indirect heat exchanger side by seawater distribution device, lower the temperature after absorbing the cold of liquid secondary refrigerant medium, part seawater freezes at heat exchanger surface, because the ice salt concentration of freezing formation is lower than the salt concn of former seawater, therefore freezing freezing can be used as elementary desalinating process; After ice is separated with remaining concentrated seawater in frozen water separator, being delivered to gravity desalinization groove, utilizing the principle of gravity desalinization, by controlling thawing rate, realizing secondary desalination; Ice after secondary desalination is delivered to ice crusher, and fragmentation makes the salt born of the same parents comprised in ice break; Crystal ice granule after fragmentation is delivered to the centrifugal desalting plant of filtering type, utilizes centrifugal action, by controlling the salts solution in centrifugal speed and the higher crystal ice granule of time further separation purity and salt born of the same parents, realizes three grades of desalinations.The desalting steps of above-mentioned three ranks and equipment simply, and save the energy, and substantially increase the ratio of desalinization of seawater, the fresh water of production can reach part industrial and agricultural production and civilian requirement.
Described fresh-water system comprises thawing tank.Crystal ice granule obtains fresh water after melting completely in thawing tank, then exports after-treatment system to by pipeline or directly export user to by water pump and water supply network.Described thawing tank inside arranges seawater desuperheating coil, makes seawater carry out heat exchange with crystal ice granule to be melted before entering ice-making machine, the pre-cold-peace ice-melt of seawater is carried out simultaneously, achieves making full use of of the energy.Described thawing tank inside can also arrange boosting coil pipe, when the heat of seawater pending in seawater desuperheating coil can not meet the heat required for ice-melt, needs to start boosting coil pipe and carries out boosting; The thermal source of described boosting coil pipe should preferentially adopt the renewable energy sources such as sun power, industry remaining/waste thermal energy or other low grade heat energies.
The inlet end of described salt water supply system is connected with the centrifugal desalting plant of filtering type with former seawater inlet, gravity desalinization groove respectively.Former seawater can carry out pre-treatment before entering salt water supply system; Be recovered to described salt water supply system through gravity desalinization groove, the centrifugal desalting plant of filtering type, ice crusher and the isolated salt solution of ice travelling belt, after former sea water mixing, realize making full use of of resource.
The seawater desuperheating coil of exit end through thawing tank inside of described salt water supply system is connected with the seawater distribution device in ice-making machine.After pending seawater exports from salt water supply system, seawater desuperheating coil in thawing tank, heat exchange is realized with ice crystal grain to be melted in thawing tank, seawater can be made before entering ice-making machine to realize precooling, thus improve ice-making machine go out ice rate, heat is used for crystal ice granule to melt as fresh water simultaneously, achieves making full use of of the energy.
Device of the present invention also comprises concentrated seawater recovery system.The entrance of described concentrated seawater recovery system is connected with the outlet of frozen water separator, reclaims the concentrated seawater reclaimed after preliminary freeze desalination.The concentrated seawater that the present invention obtains, can processing and utilization further after the recycling of concentrated seawater recovery system, as being delivered to salt manufacturing or salinization factory.
Device of the present invention can be used for implementing method of the present invention.
Technical scheme provided by the invention has the advantage of the following aspects:
(1) utilize LNG cold energy to desalinize seawater, energy-saving and emission-reduction: in the present invention, natural gas liquids absorbs the heat of secondary refrigerant by secondary refrigerant condenser, and temperature raises and gasifies, and discharges huge cold energy in phase transition process; The secondary refrigerant of cooling post liquefaction, by ice-making machine frozen portions seawater, desalinizes seawater for utilizing this processing method and provides the low-temperature receiver of low cost; Employing the present invention can save the energy consumption needed for refrigeration, reaches the effect of energy-saving and emission-reduction;
(2) step is simple, the fresh water that fresh water quality obtains higher than general cold method sea water desaltination: the present invention is directed to the feature that simple cold method sea water desalting rate is low, using freeze desalination as elementary desalination, consider on this basis and reduce engineering cost and be convenient to implement, using gravity desalinization as secondary desalination, using centrifugal desalination as three grades of desalinations, substantially increase the ratio of desalinization of seawater through three grades of desalinations, the fresh water of production can reach part industrial and agricultural production and civilian requirement;
(3) cold and hot complementation, reduce energy consumption: in the present invention seawater before entering ice-making machine first by thawing tank precooling, be fresh water by part high purity ice-out simultaneously, not only saved the heat energy required for ice-melt, reduced the chilling requirement of unit ice-making capacity in ice-making machine simultaneously; In addition, reclaim and recycle isolated low temperature seawater in secondary desalination and three grades of demineralising process, also can play and save pre-cold, improve the effect ice rate;
(4) concentrated seawater reclaims, recycling: the present invention collects the high salt concentration seawater that elementary desalination obtains, and can be used as the raw material of salt manufacturing or salt & chemical industry, reduces the cost that its seawater is concentrated, realizes the recycling of concentrated seawater after sea water desaltination.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the sea water desalinating plant based on cold energy of liquefied natural gas of the present invention; In figure: 1--secondary refrigerant condenser; 2--ice-making machine; 3--frozen water separator; 4--gravity desalinization groove; 5--ice crusher; The centrifugal desalting plant of 6--filtering type; 7--thawing tank; 8--seawater desuperheating coil; 9--salt water supply system; 10--concentrated seawater recovery system; 11--seawater distribution device; 12--container for storing liquid; 13--secondary refrigerant pump; 14--reverse checkvalve; 15--boosting coil pipe.
Embodiment
Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
Sea water desaltination is carried out according to following steps:
(1) seawater that original salt concn is 3% is got; Natural gas liquids and gaseous state R410a are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid R410a, more described liquid R410a and described seawater is fully carried out indirect heat exchange, obtain gaseous state R410a and ice and concentrated seawater; After frozen water is separated, reclaim concentrated seawater, ice is for subsequent use;
In described ice, the concentration of salt is 39% of the original salt concn of seawater;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 49%, while leaving standstill, frozen water is separated; Recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal 4min under 3000rpm condition, while centrifugal, make frozen water be separated; Recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is melted completely.
After the present embodiment process, the ratio of desalinization of seawater is 99.17%; After process, the quality of gained water is 7.54% of step (1) gained ice quality.
Embodiment 2
Sea water desaltination is carried out according to following steps:
(1) seawater that original salt concn is 3% is got; Natural gas liquids and gaseous state R410a are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid R410a, more described liquid R410a and described seawater is fully carried out indirect heat exchange, obtain gaseous state R410a and ice and concentrated seawater; After frozen water is separated, reclaim concentrated seawater, ice is for subsequent use;
In described ice, the concentration of salt is 60% of the original salt concn of seawater;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 39.5%, while leaving standstill, frozen water is separated; Recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal 4min under 5000rpm condition, while centrifugal, make frozen water be separated; Recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is melted completely.
After the present embodiment process, the ratio of desalinization of seawater is 96.8%; After process, the quality of gained water is 35.8% of step (1) gained ice quality.
Comparative example
Sea water desaltination is carried out according to following steps:
(1) seawater that original salt concn is 3% is got; Natural gas liquids and gaseous state R410a are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid R410a, more described liquid R410a and described seawater is fully carried out indirect heat exchange, obtain gaseous state R410a and ice and concentrated seawater; After frozen water is separated, reclaim concentrated seawater, ice is for subsequent use;
In ice, the concentration of salt is 55.5% of the original salt concn of seawater;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 67%, while leaving standstill, frozen water is separated; Recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal 6min under 2000rpm condition, while centrifugal, make frozen water be separated; Recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is melted completely.
After the present embodiment process, the ratio of desalinization of seawater is 97.2%; After process, the quality of gained water is 19.4% of step (1) gained ice quality.
Embodiment 3
A kind of equipment with high desalinization sea water desalinating plant (as shown in Figure 1) based on cold energy of liquefied natural gas, this device comprises the centrifugal desalination system of salt water supply system 9, seawater freezing and gravity and fresh-water system that are linked in sequence; This device also comprises liquefied natural gas gasifying system for seawater freezing energy supply and the secondary refrigerant phase transformation recycle system;
Described seawater freezing and the centrifugal desalination system of gravity comprise the centrifugal desalting plant 6 of ice-making machine 2, frozen water separator 3, gravity desalinization groove 4, ice crusher 5 and filtering type be linked in sequence;
Indirect heat exchanger is comprised in described ice-making machine 2; The side of described indirect heat exchanger is the secondary refrigerant recycle system, and opposite side is seawater distribution device 11 and mechanical deicing's device;
Described liquefied natural gas gasifying system comprises secondary refrigerant condenser 1; Described secondary refrigerant condenser 1 is plank frame, and its side is Sweet natural gas Phase Transition Systems, and opposite side is the secondary refrigerant phase transformation recycle system; The inlet end of described Sweet natural gas Phase Transition Systems is connected with the storage tank in natural gas liquids receiving station, and exit end is connected with natural gas transport pipe network;
The described secondary refrigerant phase transformation recycle system is circulation path, comprise to the stage of indirect heat exchanger from secondary refrigerant condenser order be connected container for storing liquid 12, secondary refrigerant pump 13 and reverse checkvalve 14;
Described fresh-water system comprises thawing tank 7; The inside of described thawing tank 7 is provided with seawater desuperheating coil 8 and boosting coil pipe 15;
The inlet end of described salt water supply system 9 is connected with the centrifugal desalting plant 6 of former seawater inlet, gravity desalinization groove 4 and filtering type respectively, and the seawater desuperheating coil 8 of exit end through thawing tank 7 inside is connected with described seawater distribution device 11;
This device also comprises concentrated seawater recovery system 10; The entrance of described concentrated seawater recovery system 10 is connected with the outlet of frozen water separator 3; The outlet of described concentrated seawater recovery system 10 is recycled after concentrated seawater output.
Embodiment 4
The device adopting embodiment 3 to provide implements embodiment 1.
Embodiment 5
The device adopting embodiment 3 to provide implements embodiment 2.
Although above with general explanation, embodiment and test, the present invention is described in detail, and on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.
Claims (10)
1., based on an equipment with high desalinization method for desalting seawater for cold energy of liquefied natural gas, it is characterized in that, comprise the following steps:
(1) seawater that original salt concn is 3 ~ 3.5% is got; Natural gas liquids and gaseous state secondary refrigerant are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid secondary refrigerant, more described liquid secondary refrigerant and described seawater is fully carried out indirect heat exchange, obtain gaseous state secondary refrigerant and ice and concentrated seawater; After frozen water is separated, reclaim concentrated seawater, ice is for subsequent use;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 10 ~ 50%, recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal under 2000 ~ 8000rpm condition, recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is got, after melting completely.
2. method according to claim 1, is characterized in that, in step (1) gained ice, the concentration of salt is 35 ~ 60% of the original salt concn of seawater.
3. method according to claim 1 and 2, is characterized in that, step (2) described standing while, the liquid of thawing gained is separated with remaining ice.
4. the method according to claims 1 to 3 any one, is characterized in that, step (3) is described to be centrifugally specially: centrifugal 3 ~ 5min under 3000 ~ 5000rpm condition; Frozen water is made to be separated while centrifugal.
5. method according to claim 1, is characterized in that, said method comprising the steps of:
(1) seawater that original salt concn is 3 ~ 3.5% is got; Natural gas liquids and gaseous state secondary refrigerant are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid secondary refrigerant, more described liquid secondary refrigerant and described seawater is fully carried out indirect heat exchange, obtain gaseous state secondary refrigerant, and ice and concentrated seawater; After frozen water is separated, reclaim concentrated seawater, ice is for subsequent use;
In described ice, the concentration of salt is 35 ~ 40% of the original salt concn of seawater;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 45 ~ 50%, while leaving standstill, frozen water is separated; Recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal 3 ~ 5min under 3000 ~ 3500rpm condition, while centrifugal, make frozen water be separated; Recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is melted completely.
6. method according to claim 1, is characterized in that, said method comprising the steps of:
(1) seawater that original salt concn is 3 ~ 3.5% is got; Natural gas liquids and gaseous state secondary refrigerant are fully carried out indirect heat exchange, after obtaining gaseous natural gas and liquid secondary refrigerant, more described liquid secondary refrigerant and described seawater is fully carried out indirect heat exchange, obtain gaseous state secondary refrigerant, and ice and concentrated seawater; After frozen water is separated, reclaim concentrated seawater, ice is for subsequent use;
In described ice, the concentration of salt is 55 ~ 60% of the original salt concn of seawater;
(2) get step (1) gained ice, leave standstill at ambient pressure, make the thawing rate of ice be 35 ~ 40%, while leaving standstill, frozen water is separated; Recovering liquid, remaining ice is for subsequent use;
(3) get the remaining ice of step (2) gained, be crushed to crystal ice granule, centrifugal 3 ~ 5min under 4500 ~ 5000rpm condition, while centrifugal, make frozen water be separated; Recovering liquid, crystal ice granule is for subsequent use;
(4) step (3) gained crystal ice granule is melted completely.
7. based on an equipment with high desalinization sea water desalinating plant for cold energy of liquefied natural gas, it is characterized in that, described device comprises the centrifugal desalination system of salt water supply system, seawater freezing and gravity and fresh-water system that are linked in sequence; Also comprise the liquefied natural gas gasifying system for seawater freezing energy supply and the secondary refrigerant phase transformation recycle system;
Described seawater freezing and the centrifugal desalination system of gravity comprise the ice-making machine, frozen water separator, gravity desalinization groove, ice crusher and the centrifugal desalting plant of filtering type that are linked in sequence; Comprise indirect heat exchanger in described ice-making machine, the side of described indirect heat exchanger is the secondary refrigerant phase transformation recycle system, and opposite side is seawater distribution device and mechanical deicing's device;
Described fresh-water system comprises thawing tank;
The inlet end of described salt water supply system is connected with the centrifugal desalting plant of filtering type with former seawater inlet, gravity desalinization groove respectively, the seawater desuperheating coil of exit end through thawing tank inside, is connected with described seawater distribution device.
8. device according to claim 7, is characterized in that, described liquefied natural gas gasifying system comprises secondary refrigerant condenser;
The side of described secondary refrigerant condenser is Sweet natural gas Phase Transition Systems, and opposite side is the secondary refrigerant phase transformation recycle system; The inlet end of described Sweet natural gas Phase Transition Systems is connected with the storage tank in natural gas liquids receiving station, and exit end is connected with natural gas transport pipe network;
The described secondary refrigerant phase transformation recycle system is the circulation path between described secondary refrigerant condenser and indirect heat exchanger, comprise to the stage of indirect heat exchanger from secondary refrigerant condenser order be connected container for storing liquid, secondary refrigerant pump and reverse checkvalve.
9. the device according to claim 7 or 8, is characterized in that, described thawing tank inside also comprises boosting coil pipe.
10. the device according to claim 7 ~ 9 any one, is characterized in that, described device also comprises concentrated seawater recovery system; The entrance of described concentrated seawater recovery system is connected with the outlet of frozen water separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510309752.0A CN104891593B (en) | 2015-06-08 | 2015-06-08 | A kind of equipment with high desalinization method for desalting seawater based on cold energy of liquefied natural gas and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510309752.0A CN104891593B (en) | 2015-06-08 | 2015-06-08 | A kind of equipment with high desalinization method for desalting seawater based on cold energy of liquefied natural gas and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104891593A true CN104891593A (en) | 2015-09-09 |
| CN104891593B CN104891593B (en) | 2017-03-08 |
Family
ID=54024632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510309752.0A Active CN104891593B (en) | 2015-06-08 | 2015-06-08 | A kind of equipment with high desalinization method for desalting seawater based on cold energy of liquefied natural gas and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104891593B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105439234A (en) * | 2016-01-09 | 2016-03-30 | 青岛科技大学 | Seawater freezing and freshening system utilizing cold energy of LNG (liquefied natural gas) |
| CN106882890A (en) * | 2017-03-24 | 2017-06-23 | 中国石油化工股份有限公司天然气分公司 | A kind of freezing microwave centrifugal compound method for desalting seawater and device based on cold energy of liquefied natural gas |
| CN107140772A (en) * | 2017-06-20 | 2017-09-08 | 北京建筑大学 | A kind of compound method for desalting seawater and system based on cold energy of liquefied natural gas |
| CN107720866A (en) * | 2017-11-17 | 2018-02-23 | 青岛科技大学 | A kind of continous way seawater freezing desalting plant |
| CN107902824A (en) * | 2017-10-30 | 2018-04-13 | 华中科技大学 | A kind of sewage disposal system using LNG cold energy |
| CN108613305A (en) * | 2018-06-26 | 2018-10-02 | 北京建筑大学 | A kind of cold energy of liquefied natural gas utilization system and method |
| CN112791438A (en) * | 2020-12-28 | 2021-05-14 | 魏永阳 | Cold energy desalination system and process for treating salt water |
| CN113860416A (en) * | 2021-09-30 | 2021-12-31 | 中国石油化工股份有限公司 | Seawater freezing and desalting system and method utilizing LNG cold energy |
| CN114857661A (en) * | 2022-04-22 | 2022-08-05 | 北京建筑大学 | Local air conditioning device applied to open environment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2735603C1 (en) * | 2019-12-19 | 2020-11-05 | Рушан Усманович Садеков | Device for desalination and purification of mineralized water and production of oil products, fats and organic impurities |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101624224A (en) * | 2009-08-13 | 2010-01-13 | 上海交通大学 | Desalting method with phase change for indirectly freeze seawater by using of liquefied natural gas refrigeration capacity |
| CN101628740A (en) * | 2009-08-13 | 2010-01-20 | 上海交通大学 | Method for desalting seawater by utilizing cold energy of liquefied natural gas through direct contact refrigeration |
| CN204752259U (en) * | 2015-06-08 | 2015-11-11 | 中石化天津液化天然气有限责任公司 | High salt rejection sea water desalination device based on liquefied natural gas cold energy |
-
2015
- 2015-06-08 CN CN201510309752.0A patent/CN104891593B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101624224A (en) * | 2009-08-13 | 2010-01-13 | 上海交通大学 | Desalting method with phase change for indirectly freeze seawater by using of liquefied natural gas refrigeration capacity |
| CN101628740A (en) * | 2009-08-13 | 2010-01-20 | 上海交通大学 | Method for desalting seawater by utilizing cold energy of liquefied natural gas through direct contact refrigeration |
| CN204752259U (en) * | 2015-06-08 | 2015-11-11 | 中石化天津液化天然气有限责任公司 | High salt rejection sea water desalination device based on liquefied natural gas cold energy |
Non-Patent Citations (1)
| Title |
|---|
| 李凭力等: "海水雾化冷冻脱盐技术研究", 《水处理技术》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105439234A (en) * | 2016-01-09 | 2016-03-30 | 青岛科技大学 | Seawater freezing and freshening system utilizing cold energy of LNG (liquefied natural gas) |
| CN106882890A (en) * | 2017-03-24 | 2017-06-23 | 中国石油化工股份有限公司天然气分公司 | A kind of freezing microwave centrifugal compound method for desalting seawater and device based on cold energy of liquefied natural gas |
| CN107140772A (en) * | 2017-06-20 | 2017-09-08 | 北京建筑大学 | A kind of compound method for desalting seawater and system based on cold energy of liquefied natural gas |
| CN107902824A (en) * | 2017-10-30 | 2018-04-13 | 华中科技大学 | A kind of sewage disposal system using LNG cold energy |
| CN107902824B (en) * | 2017-10-30 | 2020-06-02 | 华中科技大学 | Utilize sewage treatment system of LNG cold energy |
| CN107720866A (en) * | 2017-11-17 | 2018-02-23 | 青岛科技大学 | A kind of continous way seawater freezing desalting plant |
| CN108613305A (en) * | 2018-06-26 | 2018-10-02 | 北京建筑大学 | A kind of cold energy of liquefied natural gas utilization system and method |
| CN108613305B (en) * | 2018-06-26 | 2023-10-17 | 北京建筑大学 | Comprehensive utilization system and method for cold energy of liquefied natural gas |
| CN112791438A (en) * | 2020-12-28 | 2021-05-14 | 魏永阳 | Cold energy desalination system and process for treating salt water |
| CN113860416A (en) * | 2021-09-30 | 2021-12-31 | 中国石油化工股份有限公司 | Seawater freezing and desalting system and method utilizing LNG cold energy |
| CN114857661A (en) * | 2022-04-22 | 2022-08-05 | 北京建筑大学 | Local air conditioning device applied to open environment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104891593B (en) | 2017-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104891593A (en) | High-desalting-rate seawater desalination method and device based on liquefied natural gas cold energy | |
| CN107140772B (en) | Composite sea water desalination method and system based on liquefied natural gas cold energy | |
| CN104803433B (en) | A kind of freeze concentration processes the method for brine waste | |
| CN102583848B (en) | Seawater freezing and desalting system based on liquefied natural gas cold energy and desalting method thereof | |
| CA2807640C (en) | Process and apparatus for water purification by freezing and using a flotation medium | |
| CN105884107B (en) | A kind of freezing method water treatment facilities and its operation method | |
| US20120247149A1 (en) | Process cooling system and method using seawater | |
| CN104803432A (en) | Method and device of multilevel utilization of cold energy of LNG | |
| CN101792193B (en) | Device and method for desalting seawater by using cold energy of liquefied natural gas | |
| CN101624224A (en) | Desalting method with phase change for indirectly freeze seawater by using of liquefied natural gas refrigeration capacity | |
| CN102531261B (en) | Liquefied natural gas (LNG) cold energy-driving seawater desalination device and method with double functions of vaporization and freezing | |
| CN204752259U (en) | High salt rejection sea water desalination device based on liquefied natural gas cold energy | |
| CN109574334B (en) | Method for carrying out deep concentration and solid-liquid separation on strong brine | |
| CN105461133A (en) | Wind-solar complementary seawater desalination system | |
| CN206915896U (en) | A kind of freezing microwave centrifugal compound sea water desalinating unit based on cold energy of liquefied natural gas | |
| CN103234318A (en) | Demisting and ice-making apparatus and method using liquefied natural gas cold energy | |
| CN103739024A (en) | Device and method for desalting seawater by gasified absorption heat of liquefied natural gas | |
| CN205387483U (en) | In succession freezing crystal separation system for waste water | |
| CN115342597A (en) | LNG cold energy used for air separation and seawater desalination system and comprehensive utilization method thereof | |
| CN106641710B (en) | LNG regasification system | |
| CN202415309U (en) | Liquefied natural gas cold energy-driven seawater desalting device with dual functions of vaporizing and freezing | |
| CN203680586U (en) | Device for utilizing cold energy of liquefied natural gas (LNG) satellite station | |
| CN108613305B (en) | Comprehensive utilization system and method for cold energy of liquefied natural gas | |
| CN111606380A (en) | Fluidized bed type seawater ice-making desalination system and desalination method thereof | |
| CN208671231U (en) | A kind of cold energy of liquefied natural gas utilization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Hui Inventor after: Li Hengsong Inventor after: Zhang Sijian Inventor after: Shen Hongliang Inventor after: Wang Baoqing Inventor after: Li Xuemei Inventor before: Yang Hui Inventor before: Li Hengsong Inventor before: Zhang Sijian |
|
| COR | Change of bibliographic data | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200811 Address after: 100027 Beijing, Chaoyangmen, North Street, No. 22, No. Co-patentee after: Beijing University of Civil Engineering and Architecture Patentee after: China Petroleum & Chemical Corp. Address before: 300457, Tianjin Binhai New Area First Avenue TEDA MSD-C1 block 7 Co-patentee before: Beijing University of Civil Engineering and Architecture Patentee before: SINOPEC TIANJIN LIQUEFACTION NATURAL GAS Co.,Ltd. |