CN104030515B - A kind of vacuum seawater desalination system and technique - Google Patents

A kind of vacuum seawater desalination system and technique Download PDF

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CN104030515B
CN104030515B CN201410313977.9A CN201410313977A CN104030515B CN 104030515 B CN104030515 B CN 104030515B CN 201410313977 A CN201410313977 A CN 201410313977A CN 104030515 B CN104030515 B CN 104030515B
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vacuum
seawater
pipe
sea
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CN104030515A (en
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任建军
任志夫
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Longnan Zhifu plastic products Co. Ltd.
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任建军
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124Water desalination

Abstract

A kind of vacuum seawater desalination system and technique, described system includes water intaking preheating device, vacuum distillation plant and the light water storage apparatus being sequentially connected with, and the system control device being electrically connected with vacuum distillation plant and light water storage apparatus;Described water intaking preheating device includes seawater filter and seawater preheating pond;Described vacuum distillation plant includes salt water heater and steam condenser;Described light water storage apparatus includes airtight vacuum fresh-water tank and the vacuum pump connected with vacuum fresh-water tank.The present invention utilize salt water heater evaporation after concentrated seawater waste heat to need desalination sea water preheat, and utilize sea water with the temperature difference of steam, fresh water steam to be condensed, make full use of waste heat and the energy of the Nature that system produces, there is the effect of energy-conserving and environment-protective;System arranges a vacuum pump provides vacuum and the function drawn water, a tractor serves several purposes to be embodied as system;Desalination process based on vacuum seawater desalination system, fresh water yield is higher than the product in equal heat-collecting temperature and technique.

Description

A kind of vacuum seawater desalination system and technique
Technical field
The present invention relates to field of seawater desalination, be specifically related to a kind of vacuum seawater desalination system and technique.
Background technology
China is vast in territory, sea water and underground bitter aboundresources, under the severe situation that fresh water is in short supply, exploitation and using of seawater and bitter resource, carry out sea water (bitter) desalination and become an effective strategy approach of China's fresh water problem in short supply of increasing income and decreasing expenditure, solve.Desalination technology is to be separated with moisture by the salinity in sea water, finally gives fresh water and concentrates technology and the process of saline.Classifying according to desalination processes, method for desalting seawater mainly has full-boiled process, embrane method and chemical method three major types.Full-boiled process desalination technology is mainly the way of distillation, including multistage flash evaporation and low temperature distillation technology.Low temperature distillation technology is the vacuum making the interior holding of vaporization chamber certain, i.e. in negative pressure state, makes sea water evaporate at a lower temperature and becomes steam, and steam is met condensation and formed fresh water.The low-grade energies such as solar energy can be utilized owing to cryogenic distillation process desalinizes seawater, to the reason such as the corrosivity of device is relatively low, development in recent years is rapid, but its major defect is that in maintaining vaporizer, vacuum needs a large amount of electric energy, supply water and after evaporation, concentrated seawater discharge is also required to consume a large amount of pump merit, thus construction costs is higher.If Chinese patent CN2344390Y, CN1473765A, CN200978230Y etc. are to utilize vacuum pump to obtain the vacuum environment needed for the desalination of sea water low temperature.Chinese patent CN101177308A utilizes sea water gravity and atmospheric pressure natural method to produce vacuum, required energy is fewer than traditional approach, but this method utilizes water filling, and emptying obtains vacuum, first vacuum is relatively low, and can slowly reduce in evaporation of seawater process vacuum, until balancing with atmospheric pressure, cause vacuum unstable, sea water boiling point can not remain stable, and therefore fresh water yield is difficult to promote.
Seawater desalination system, during extracting seawater, due to salt content and the content of mineral substances of sea water, has certain corrosiveness, therefore the maintenance and repair of sea water draw-off pump is added cost sea water draw-off pump.
Summary of the invention
It is contemplated that overcome the above-mentioned deficiency of prior art, it is provided that a kind of energy-conserving and environment-protective, make full use of the Nature energy, improve fresh water yield, extend system service life, the vacuum seawater desalination system reducing maintenance cost and technique.
The present invention is achieved through the following technical solutions:
A kind of vacuum seawater desalination system, including the water intaking preheating device being sequentially connected with, vacuum distillation plant and light water storage apparatus, and the system control device being electrically connected with vacuum distillation plant and light water storage apparatus, described water intaking preheating device includes seawater filter and seawater preheating pond;Described seawater filter water inlet end is provided with intake pipe and connects with sea, and water side is provided with feed pipe and is connected with vacuum distillation plant;Described feed pipe wears seawater preheating pond;Described vacuum distillation plant includes salt water heater and steam condenser;Described salt water heater is connected with feed pipe, is provided with the drain pipe being connected with seawater preheating pond bottom salt water heater;Described steam condenser is connected with salt water heater by steam pipe, and is connected with light water storage apparatus by fresh water pipe;Described light water storage apparatus includes airtight vacuum fresh-water tank and the vacuum pump connected with vacuum fresh-water tank.
Being additionally provided with air intake duct bottom described salt water heater, air intake duct top is higher than salt water heater height;It is additionally provided with sea water high position limit switch and sea water low level limit switch on described salt water heater, bottom salt water heater, is provided with emptied of water bit switch.
The drainage pipe end of described salt water heater is located at bottom seawater preheating pond;Top, seawater preheating pond is provided with overflow pipe;Described overflow pipe position height is less than the discharge outlet position height of salt water heater;Seawater preheating is provided with blow-off pipe bottom pond.
Described steam condenser is submerge sea undersurface linking steam pipe and the condensing tube of fresh water pipe.
Described condensing tube and wear that the water supply pipeline section in seawater preheating pond is serpentine-like or spiral type or spiral type.
Described light water storage apparatus also includes fresh water storage tank;Being connected by water pipe between described vacuum fresh-water tank and fresh water storage tank, vacuum pump is located on water pipe.
Described vacuum fresh-water tank is provided with vacuum meter;Described fresh water storage tank is provided with the water supply pipe drawing fresh water.
Described salt water heater top is provided with air bleeding valve;Feed pipe between described seawater filter and seawater preheating pond is provided with feed water valve;Described drain pipe is provided with exhaust-valve;Described air intake duct is provided with air cock;It is equipped with check-valves on feed pipe on described fresh water pipe and described seawater filter water side;Described blow-off pipe is provided with blowoff valve.
Described system control device includes the accumulator battery of the electric energy of central processing unit, TRT and the generation of storage TRT, and the power supply in parallel with accumulator battery.
A kind of desalination process based on above-mentioned vacuum seawater desalination system, including water intaking process and still-process;Described water intaking process comprises the following steps:
S101, making system be in air-tight state, open feed water valve and vacuum pump, the undersurface intake pipe in sea of submerging starts to draw sea water;
S102, sea water enter seawater filter through intake pipe and filter, and the sea water after filtration flows through the feed pipe wearing seawater preheating device, preheats sea water;
Sea water after S103, preheating enters salt water heater, when liquid level arrives sea water high position limit switch, triggers sea water high position limit switch and sends a signal to system control device;
S104, system control device close feed water valve, complete water intaking process and enter still-process.
Described still-process specifically includes following steps:
S201, system control device open air cock, and air enters salt water heater through air intake duct and seethes in salt water heater, and sea water flowing makes temperature keep unified;
S202, closedown air cock, maintain-0.07 to-0.09Mpa by system internal gas pressure;
In S203, salt water heater after fresh water evaporation, when liquid level drops to sea water low level limit switch, trigger sea water low level limit switch and send a signal to system control device;
S204, vacuum pump are closed, exhaust valve opening, and the sea water after concentrating enters seawater preheating pond;
S205, concentrated seawater empty, and emptied of water bit switch triggers and send a signal to system control device, and system enters next water intaking process.
The beneficial effects of the present invention is:
1, the sea water after seawater preheating pond utilizes salt water heater evaporation and concentration heats, and makes full use of the waste heat that system produces, can save the energy;
2, the discharge outlet of salt water heater is higher than overflow pipe position height, and therefore the sea water in salt water heater can naturally drain under gravity, it is not necessary to employs suction pump, can save the energy and use and construction costs;
3, owing to the structure of native system is suitable for by the sea or uses on boats and ships, island, therefore use environment the moistest, salt water heater is provided with air intake duct, salt water heater is entered through air intake duct at evaporation process air, air seethes in salt water heater, sea water flowing makes temperature reach uniform, and malaria introduces system, increases the fresh water yield of system;Air increases the contact area of air and sea water during seething in sea water, i.e. increase evaporation effective area, can accelerate fresh water evaporation;
4, native system is only with a vacuum pump, to meet sea water extraction, the acquisition of vacuum and the extract function of fresh water, vacuum pump is arranged on light water storage apparatus, fresh water salt content is low, corrosion to vacuum pump is little, can extend the service life of vacuum pump, compare for needing the sea water desalinating unit by the direct extracting seawater of water pump and system, native system can save the biggest maintenance cost;
5, native system vacustat, the boiling point of sea water is also maintained at constant scope, it is ensured that fresh water yield.
Accompanying drawing explanation
Fig. 1 is the system pipeline connection diagram of the present invention.
In figure: 1-seawater filter, 11-intake pipe, 2-seawater preheating pond, 21-overflow pipe, 3-salt water heater, 31-feed pipe, 32-drain pipe, 33-air intake duct, 34-emptied of water bit switch, 35-air bleeding valve, 36-feed water valve, 37-exhaust-valve, 38-air cock, 4-steam condenser, 41-steam pipe, 42-fresh water pipe, 51-vacuum fresh-water tank, 52-fresh water storage tank, 53-vacuum pump, 54-water pipe, 55-water supply pipe, 56-vacuum meter, 61-central processing unit, 62-TRT, 63-accumulator battery, 64-power supply.
Detailed description of the invention
For the ease of the understanding of those skilled in the art, the invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of vacuum seawater desalination system, including the water intaking preheating device being sequentially connected with, vacuum distillation plant and light water storage apparatus, and the system control device being electrically connected with vacuum distillation plant and light water storage apparatus, described water intaking preheating device includes seawater filter 1 and seawater preheating pond 2, described seawater filter 1 water inlet end is provided with intake pipe 11 and connects with sea, and water side is provided with feed pipe 31 and is connected with vacuum distillation plant;Described feed pipe 31 wears seawater preheating pond 2;Described vacuum distillation plant includes salt water heater 3 and steam condenser 4;Described salt water heater 3 is provided with water inlet and is connected with feed pipe 31, is provided with discharge outlet and is connected with drain pipe 32 bottom salt water heater 3, and drain pipe 32 end submerges bottom seawater preheating pond 2;Described steam condenser 4 is connected with salt water heater 3 by steam pipe 41, and is connected with light water storage apparatus 5 by fresh water pipe 42.
Described light water storage apparatus includes airtight vacuum fresh-water tank 51, vacuum pump 53 and fresh water storage tank 52;Being connected by water pipe 54 between described vacuum fresh-water tank 51 and fresh water storage tank 52, vacuum pump 53 is located on water pipe 54.Vacuum pump 53 is arranged on light water storage apparatus, and fresh water salt content is low, and the corrosion to vacuum pump is little, can extend the service life of vacuum pump.Described vacuum fresh-water tank 51 is provided with vacuum meter 53;Described fresh water storage tank 52 is provided with the water supply pipe 55 drawing fresh water.
Being additionally provided with air intake duct 33 bottom described salt water heater 3, air intake duct 33 top is higher than salt water heater 3 height.Air intake duct 33 is set bottom salt water heater 3, make air sea water in suction process reach the state of seething, ocean temperature can be stirred, and native system is applicable to marine traveling boats and ships or land, seashore, there was dampness in the air, and malaria sucks can increase fresh water yield.
It is additionally provided with sea water high position limit switch and sea water low level limit switch on described salt water heater 3, bottom salt water heater, is provided with emptied of water bit switch 34.In sea water suction process, sea water arrives sea water high position limit switch and i.e. stops the absorption of sea water;Total in evaporation process, when sea water liquid level drops to sea water low level limit switch, then stop evaporation, trigger emptied of water bit switch 34, the sea water in emptying salt water heater 3, enter the subsequent work cycle.The present embodiment salt water heater is solar still, it is possible to use other heaters to replace.
Described seawater preheating pond 2 is the concentrated seawater collecting pit after vacuum distillation plant distillation, and top, seawater preheating pond 2 is provided with overflow pipe 21;Described overflow pipe 21 position height is less than the discharge outlet position height of salt water heater 3.It is provided with blow-off pipe bottom seawater preheating pond 2.
Described steam condenser 4 is the submerge undersurface linking in sea steam pipe 41 and the condensing tube of fresh water pipe 42.Described condensing tube and wear that the water supply pipeline section in seawater preheating pond 2 is serpentine-like or spiral type or spiral type.Snakelike or spiral type or spiral type can increase heat exchange area, improve heat exchanger effectiveness.
Described salt water heater 3 top is provided with air bleeding valve 35;Feed pipe 31 between described seawater filter 1 and seawater preheating pond 2 is provided with feed water valve 36;Described drain pipe 32 is provided with exhaust-valve 37;Described air intake duct 33 is provided with air cock 38;It is equipped with check-valves on feed pipe 31 on described fresh water pipe 42 and described seawater filter 2 water side;Described blow-off pipe is provided with blowoff valve.
Described system control device includes the accumulator battery 63 of the electric energy of central processing unit 61, TRT 62 and storage TRT 62 generation, and the power supply 64 in parallel with accumulator battery 63, power supply 64 is alternative power source, can start power supply 64 when TRT 62 can not be powered in time for system power supply.
A kind of desalination process based on above-mentioned vacuum seawater desalination system, including water intaking process and still-process;Described water intaking process comprises the following steps:
S101, closedown air bleeding valve 35, exhaust-valve 37 and air cock 38, make system be in air-tight state, open feed water valve 36 and vacuum pump 53, and the undersurface intake pipe in sea of submerging 11 starts to draw sea water;
S102, sea water enter seawater filter 1 through intake pipe 11 and filter, and the sea water after filtration flows through the feed pipe 31 wearing seawater preheating pond 2, preheats sea water;
Sea water after S103, preheating enters salt water heater 3, when liquid level arrives sea water high position limit switch, triggers sea water high position limit switch and sends a signal to system control device;
S104, system control device close feed water valve 36, complete water intaking process and enter still-process;
Described still-process specifically includes following steps:
S201, system control device open air cock 38, and air enters salt water heater 3 through air intake duct 33 and seethes in salt water heater 33, and sea water flowing makes temperature reach uniform;
S202, closedown air cock 38, maintain-0.07 to-0.09Mpa by system internal gas pressure;
In S203, salt water heater 3 after fresh water evaporation, when liquid level drops to sea water low level limit switch, trigger sea water low level limit switch and send a signal to system control device;
S204, vacuum pump 53 are closed, air bleeding valve 35 is opened, and the sea water after concentrating enters seawater preheating pond;
S205, concentrated seawater empty, and emptied of water bit switch 34 triggers and send a signal to system control device, and system enters next water intaking process.
Above content is to combine concrete optimal way further description made for the present invention, should not assert the present invention be embodied as be confined to described above.For those skilled in the art, without departing from the inventive concept of the premise, it is also possible to make some simple deduction or replace, within the protection domain that the claim being regarded as being submitted to by the present invention determines.

Claims (9)

1. a vacuum seawater desalination system, including the water intaking preheating device being sequentially connected with, vacuum distillation plant and light water storage apparatus, and the system control device being electrically connected with vacuum distillation plant and light water storage apparatus, it is characterised in that:
Described water intaking preheating device includes seawater filter (1) and seawater preheating pond (2);Described seawater filter (1) water inlet end is provided with intake pipe (11) and connects with sea, and water side is provided with feed pipe (31) and is connected with vacuum distillation plant;Described feed pipe (31) wears seawater preheating pond (2);
Described vacuum distillation plant includes salt water heater (3) and steam condenser (4);Described salt water heater (3) is connected with feed pipe (31), and salt water heater (3) bottom is provided with the drain pipe (32) being connected with seawater preheating pond (2);Described steam condenser (4) is connected with salt water heater (3) by steam pipe (41), and is connected with light water storage apparatus (5) by fresh water pipe (42);
Described light water storage apparatus includes airtight vacuum fresh-water tank (51) and the vacuum pump (53) connected with vacuum fresh-water tank (51);
Described salt water heater (3) bottom is additionally provided with the air intake duct (33) introduced air in salt water heater (3), and air intake duct (33) top is higher than salt water heater (3) highly;It is additionally provided with sea water high position limit switch and sea water low level limit switch on described salt water heater (3), bottom salt water heater, is provided with emptied of water bit switch (34).
Vacuum seawater desalination system the most according to claim 1, it is characterised in that: drain pipe (32) end of described salt water heater (3) is located at bottom, seawater preheating pond (2);Seawater preheating pond (2) top is provided with overflow pipe (21);Described overflow pipe (21) position height is less than the discharge outlet position height of salt water heater (3);Bottom, seawater preheating pond (2) is provided with blow-off pipe.
Vacuum seawater desalination system the most according to claim 2, it is characterised in that: described steam condenser (4) is for submerging the undersurface linking in sea steam pipe (41) and the condensing tube of fresh water pipe (42).
Vacuum seawater desalination system the most according to claim 3, it is characterised in that: described condensing tube and wear that the water supply pipeline section in seawater preheating pond (2) is serpentine-like or spiral type or spiral type.
Vacuum seawater desalination system the most according to claim 4, it is characterised in that: described light water storage apparatus also includes fresh water storage tank (52);Being connected by water pipe (54) between described vacuum fresh-water tank (51) and fresh water storage tank (52), vacuum pump (53) is located on water pipe (54).
Vacuum seawater desalination system the most according to claim 5, it is characterised in that: described vacuum fresh-water tank (51) is provided with vacuum meter (53);Described fresh water storage tank (52) is provided with the water supply pipe (55) drawing fresh water.
Vacuum seawater desalination system the most according to claim 6, it is characterised in that: described salt water heater (3) top is provided with air bleeding valve (35);Feed pipe (31) between described seawater filter (1) and seawater preheating pond (2) is provided with feed water valve (36);Described drain pipe (32) is provided with exhaust-valve (37);Described air intake duct (33) is provided with air cock (38);Described fresh water pipe (42) is equipped with check-valves on the feed pipe (31) above and at described seawater filter (2) water side;Described blow-off pipe is provided with blowoff valve.
Vacuum seawater desalination system the most according to claim 7, it is characterized in that: described system control device includes central processing unit (61), TRT (62) and stores the accumulator battery (63) of the electric energy that TRT (62) produces, and the power supply (64) in parallel with accumulator battery (63).
9. utilize in claim 7 to 8 the vacuum seawater desalination system described in any one to carry out a desalination process for vacuum seawater desalination system, including water intaking process and still-process;Described water intaking process comprises the following steps:
S101, making system be in air-tight state, open feed water valve (36) and vacuum pump (53), the undersurface intake pipe in sea of submerging (11) starts to draw sea water;
S102, sea water enter seawater filter (1) through intake pipe (11) and filter, and the sea water after filtration flows through the feed pipe (31) wearing seawater preheating pond (2), preheats sea water;
Sea water after S103, preheating enters salt water heater (3), when liquid level arrives sea water high position limit switch, triggers sea water high position limit switch and sends a signal to system control device;
S104, system control device close feed water valve (36), complete water intaking process and enter still-process;
Described still-process specifically includes following steps:
S201, system control device open air cock (38), and air enters salt water heater (3) through air intake duct (33) and seethes in salt water heater (33), and sea water flowing makes temperature reach uniform;
S202, closedown air cock (38), maintain-0.07 to-0.09Mpa by system internal gas pressure;
After the evaporation of S203, salt water heater (3) interior fresh water, when liquid level drops to sea water low level limit switch, trigger sea water low level limit switch and send a signal to system control device;
S204, vacuum pump (53) are closed, and air bleeding valve (35) is opened, and the sea water after concentrating enters seawater preheating pond;
S205, concentrated seawater empty, and emptied of water bit switch (34) triggers and send a signal to system control device, and system enters next water intaking process.
CN201410313977.9A 2014-07-03 2014-07-03 A kind of vacuum seawater desalination system and technique Active CN104030515B (en)

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CN106335955B (en) * 2016-10-14 2019-10-25 中海石油(中国)有限公司 A kind of integrated engine waste heat fresh water device

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CN101177308A (en) * 2007-11-16 2008-05-14 上海理工大学 Natural vacuum low temperature distillation sea water desalination method and device
CN202988778U (en) * 2012-11-16 2013-06-12 海南大学 Sea water desalination device
CN203938555U (en) * 2014-07-03 2014-11-12 任建军 A kind of vacuum seawater desalination system

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Publication number Priority date Publication date Assignee Title
CN101117246A (en) * 2007-07-11 2008-02-06 贾海滨 Integral solar energy sea water desalination production apparatus
CN101177308A (en) * 2007-11-16 2008-05-14 上海理工大学 Natural vacuum low temperature distillation sea water desalination method and device
CN202988778U (en) * 2012-11-16 2013-06-12 海南大学 Sea water desalination device
CN203938555U (en) * 2014-07-03 2014-11-12 任建军 A kind of vacuum seawater desalination system

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