CN104628203A - Conditioning device for low-temperature multi-effect distillation seawater desalination system and conditioning method thereof - Google Patents
Conditioning device for low-temperature multi-effect distillation seawater desalination system and conditioning method thereof Download PDFInfo
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- CN104628203A CN104628203A CN201410848188.5A CN201410848188A CN104628203A CN 104628203 A CN104628203 A CN 104628203A CN 201410848188 A CN201410848188 A CN 201410848188A CN 104628203 A CN104628203 A CN 104628203A
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- pipe
- effect distillation
- seawater desalination
- water
- modifying device
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- 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
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- 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
- C02F1/06—Flash evaporation
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- 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
The invention discloses a conditioning device for a low-temperature multi-effect distillation seawater desalination system. The low-temperature multi-effect distillation seawater desalination system comprises a product water main pipe, and a low-temperature multi-effect distillation seawater desalination device with multiple water production pipes connected to the product water main pipe beside, wherein the low-temperature multi-effect distillation seawater desalination device comprises multiple evaporators connected in series sequentially, and flash tanks which correspond to the evaporators one by one. The conditioning device comprises a controller, a dosing tank, a dosing pipe, and a pH meter which is arranged at the tail part of the water production pipe and is in signal connection with the controller, wherein the dosing pipe is connected to the outlet pipe sides of the evaporators and flash tanks. According to the conditioning device for the seawater desalination product water, the conditioning device is connected to the flash tanks, the addition amount of the agents is adjusted by virtue of negative pressure suction of the flash tanks or by utilizing the dosing pump, the diluted sodium hydroxide solution enters the product water flash tank by virtue of the negative pressure and dosing pump, the stability of the dosing flow is guaranteed, and great pH value fluctuation is prevented.
Description
Technical field
The present invention relates to field of sea water desalting technology, particularly relate to a kind of modifying device and hardening and tempering method of horizontal pipe falling film evaporation formula low temperature multiple-effect distillation seawater desalination system.
Background technology
China is one of area of water resources famine, and especially in its coastland, the inexorable trend shifted to seashore along with heavy industry, water shortage problem will become more outstanding.Sea water desaltination, wants fresh water to solve the optimal path that water resources lacks problem just to sea.
Conventional method for desalting seawater is divided into Re Fa and embrane method two kinds, comprises the multistage flash distillation of hot method, low temperature multiple-effect distillation and pressure steam distillation.Low temperature multiple-effect distillation (english abbreviation is LT-MED) steam is passed into desalting equipment (being called vaporizer), seawater spraying is heat-exchanging tube bundle surface in vaporizer, vapor condensation in managing, part evaporation of seawater, the secondary steam produced enters in next stage pipe and carries out same heat transfer process (every one-level is called an effect), finally vapor condensation gained distilled water is collected and obtain highly purified product fresh water, by evaporation repeatedly and condensation process, system can obtain the product water being several times as much as heating steam amount.
Low temperature multi-effect seawater desalting system adopts distillation mode to produce water, partial period there will be the situation that sea water desaltination desalination water house steward on-line measurement pH value reduces, may less than 6.5 be down to time minimum, this is also situation about often occurring in this sea water desaltination treatment process, even if change greatly from technique sea water preprocessing water outlet pH, can not cause seawater desalination system product water pH value technological principle and increase and decrease in proportion.And in " drinking water sanitary standard " (GB5749-2006), the pH value range of regulation tap water is 6.5-8.5, is also in this pH value range, meets HUMAN HEALTH needs most, body is the most healthy, immunizing power is the strongest.Sea water desaltination water wants the extensive supply realizing city, how to determine and to solve the adjustment problem of pH value imperative.
Summary of the invention
The object of the invention is the technological deficiency for existing in prior art, and a kind of modifying device and hardening and tempering method of low temperature multiple-effect distillation seawater desalination system are provided.
The technical scheme adopted for realizing object of the present invention is:
A kind of modifying device of low temperature multiple-effect distillation seawater desalination system, described low temperature multiple-effect distillation seawater desalination system comprises product jellyfish pipe, the low temperature multiple-effect distillation sea water desalting device of jellyfish pipe is produced in the other access of multiple water producing pipe, described low temperature multiple-effect distillation sea water desalting device comprises multiple vaporizer of connecting successively, and with described vaporizer flash tank one to one, described modifying device comprises controller, grug feeding jar, chemical feed pipe and be arranged on described water producing pipe terminal part and the pH meter be connected with described controller signals, the outlet pipe side of described chemical feed pipe access vaporizer flash tank.
Also comprise the dosing pump, the described dosing pump that are connected controlled with described controller medicament is pumped in flash tank.
Described low temperature multiple-effect distillation sea water desalting device comprises multiple individual vaporizer of connecting successively, the flash tank water outlet side that described chemical feed pipe access second effect finisher is corresponding.
Described chemical feed pipe is serially connected with at least two segregaion valves.
Described dosing pump is peristaltic pump, and described chemical feed pipe is tetrafluoroethylene material.
Described vaporizer is level pipe sprinkling falling-film evaporator.
The hardening and tempering method of modifying device, comprise the following steps:
1) detect product pump outlet tube product water pH value, making it to maintain 6.5-7.5 these intervals, as exceeded this scope, then carrying out next step;
2) by the segregaion valve on controller opens chemical feed pipe, control to start dosing pump, given flow is 0-500ml/min,
3) pH value reading continuously feedback judges its value whether between 6.5-7.5 by Controlling System, if then carry out next step, then continues step 2 if not);
4) whether after the scheduled time, main water outlet pipe pH value is sent in observation, maintain between 6.5-7.5, otherwise reports to the police.
Compared with prior art, the invention has the beneficial effects as follows:
Sea water desaltination product water modifying device of the present invention, modifying device is accessed flash tank, suck or utilize dosing pump to adjust the add-on of medicament by the negative pressure of flash tank, the sodium hydroxide solution of dilution relies on negative pressure and dosing pump to enter product water flash tank, ensure that the stability of dosing flow, prevent pH value fluctuation, alkali lye mixes through multistage flash evaporation after adding simultaneously, the mixed effect of effective raising alkali lye and product water, separately there is the stirring action sending water pump impeller, further enhancing the mixed effect of solution.Coordinate the feedback of pH meter, the pH value of final control desalination water, at 6.5-7.5, overcomes the unequal situation of mixing of line mixer dosing, utilizes system self structure in a large number simultaneously, utilize the spare interface of flash tank to realize medicament and add.Carry out water quality regulation compared in product water terminal, reduce the expenses such as the buying of civil engineering, equipment and pipeline, construction, installation in a large number.By the enforcement of this modifying device, overcome the difficult problem effectively cannot implementing modifying device through multi-argument in product water water main pipe, ensure that operation and the water conditioning of low-temperature multi-effect seawater desalination device from the aspect such as economy, reliability and safety.
Accompanying drawing explanation
Figure 1 shows that the structural representation of the modifying device of low temperature multiple-effect distillation seawater desalination system of the present invention.
Embodiment
Below in conjunction with accompanying drawing and concrete case study on implementation, the present invention is described in further detail.Should be appreciated that concrete case study on implementation described herein is only in order to explain the present invention, is not intended to limit the present invention.
The factor that can affect the change of sea water desaltination product water pH value is many, the Scale inhibitors added as needed when seawater desalination system side is normally run and defoamer, need the coagulating agent, flocculation agent etc. added that pH value all can be caused to change when sea water preprocessing side is run, and cause the factors such as nitrogenous nitrogen and the increase of organism amount, clorox dosage in the summer that seawater temperature is higher.Simultaneously, issuable problem is used for clorox, conventional design is for install reductive agent chemicals dosing plant additional at sea water desaltination clean water pump room, online chlorine residue table is set after chemicals dosing plant simultaneously, after Electrolyzed sea water chlorination System puts into operation, add reductive agent (as S-WAT), when ensureing pan feeding seawater improper sterilization, control residual chlorine amount in former seawater, avoid it to impact product water pH value.
As shown in Figure 1, low temperature multiple-effect distillation sea water desalting device of the present invention comprises product jellyfish pipe, the low temperature multiple-effect distillation sea water desalting device of jellyfish pipe is produced in 15 other accesses of water producing pipe, the described modified unit of low temperature multiple-effect distillation sea water desalting product water comprises 15 level pipe sprinkling falling-film evaporators 1 of connecting successively, with described vaporizer flash tank 2 one to one, and modifying device 3, described modifying device comprises controller, be provided with the grug feeding jar 31 of stirring mechanism, the dosing pump 32 that be connected controlled with described controller, as Wo Senmaluo peristaltic pump, the chemical feed pipe 33 of tetrafluoroethylene material and be arranged on described water producing pipe terminal part and the pH meter 34 be connected with described controller signals, the influent side of one of them flash tank of described chemical feed pipe access before latter two flash tank, as the 3rd, 4th, 5th or flash tank influent side corresponding to sextuple-effect evaporator.Be set on described chemical feed pipe and be serially connected with at least two segregaion valves to isolate the vacuum of flash tank.
Wherein, it is pointed out that and the negative pressure of flash tank also can be relied on completely to complete adding of medicament, do not repeat them here.
Specifically, power steam enter into sea water desalinating plant first effect heat-exchanging tube bundle (vaporizer) in and at in-tube condensation, pipe off-lying sea water produces the secondary steam with the basic equivalent of condensation number, secondary steam is after mist eliminator, enter next effect heat-exchanging tube bundle, in pipeline, condensation is produced product water and is imported by conduit in the flash tank of product water side, a dividing plate is had in flash drum overhead, when product water is pooled to flash tank and through dividing plate through water producing pipe, because next effect vacuum values is lower than a upper effect, temperature is lower than a upper effect, flash distillation effect can be there is and produce steam in product water at dividing plate rear, this steam enters next effect together together with secondary steam, product water after flash distillation enters next effect flash tank, when this process is circulated to the 6th effect, (the application adds the 6th effect for modifying device medicament, be not limited to the 6th effect) time, alkali lye (as NaOH) is added by modifying device before the 6th effect flash tank dividing plate, when product water flows through dividing plate flash distillation again, alkali lye also can be included in the steam of flash distillation generation, through twice flash distillation, alkali lye is fully mixed in each effect product water, finally be collected to product water surge tank, send after product water pump impeller is uniformly mixed, the add-on of alkali lye can be adjusted in time in conjunction with the pH feedback of water producing pipe end and control device simultaneously, ensure that pH value is at zone of reasonableness.
For concrete operating mode, consider the construction and installation of on-the-spot modifying device and the factor of operation tour aspect, dosing pump is finally arranged between dosing, the reserved flange of alkali pipelining in the 6th effect flash tank will be added, configuration concentration is certain density sig water (NaOH), starts agitator and is mixed by alkali lye.Open two place's isolating doors in drug feeding pipeline, control to start peristaltic pump, given flow is 0-500ml/min, and the water outlet pH value detecting water producing pipe, whether between 6.5-7.5, if then stop dosing, then proceeds dosing if not.Whether send main water outlet pipe pH value maintain 6.5-7.5 between, then alarm carries out problem investigation if not if observing after the scheduled time.
It is cofactor that the present invention utilizes front side to arrange the chlorine residue of reductive agent interpolation mechanism controls breakthroughly, and rear side increases modifying device, utilizes alkali lye to add adjust ph, controlling and adjustment two methods, effectively stabilizes the pH value change of desalination water, improves product quality.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. the modifying device of a low temperature multiple-effect distillation seawater desalination system, it is characterized in that, described low temperature multiple-effect distillation seawater desalination system comprises product jellyfish pipe, the low temperature multiple-effect distillation sea water desalting device of jellyfish pipe is produced in the other access of multiple water producing pipe, described low temperature multiple-effect distillation sea water desalting device comprises multiple vaporizer of connecting successively, and with described vaporizer flash tank one to one, described modifying device comprises controller, grug feeding jar, chemical feed pipe and be arranged on described water producing pipe terminal part and the pH meter be connected with described controller signals, the outlet pipe side of described chemical feed pipe access vaporizer flash tank.
2. modifying device as claimed in claim 1, is characterized in that, also comprises the dosing pump, the described dosing pump that are connected controlled with described controller and is pumped in flash tank by medicament.
3. modifying device as claimed in claim 1, it is characterized in that, described low temperature multiple-effect distillation sea water desalting device comprises multiple individual vaporizer of connecting successively, the flash tank water outlet side that described chemical feed pipe access second effect finisher is corresponding.
4. modifying device as claimed in claim 2, is characterized in that, described chemical feed pipe is serially connected with at least two segregaion valves.
5. modifying device as claimed in claim 2, it is characterized in that, described dosing pump is peristaltic pump, and described chemical feed pipe is tetrafluoroethylene material.
6. modifying device as claimed in claim 1, it is characterized in that, described vaporizer is level pipe sprinkling falling-film evaporator.
7. use a hardening and tempering method for modifying device as claimed in claim 4, it is characterized in that, comprise the following steps:
1) detect product pump outlet tube product water pH value, making it to maintain 6.5-7.5 these intervals, as exceeded this scope, then carrying out next step;
2) by the segregaion valve on controller opens chemical feed pipe, control to start dosing pump, given flow is 0-500ml/min,
3) pH value reading continuously feedback judges its value whether between 6.5-7.5 by Controlling System, if then carry out next step, then continues step 2 if not);
4) whether after the scheduled time, main water outlet pipe pH value is sent in observation, maintain between 6.5-7.5, otherwise reports to the police.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848188.5A CN104628203B (en) | 2014-12-29 | 2014-12-29 | Conditioning device for low-temperature multi-effect distillation seawater desalination system and conditioning method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848188.5A CN104628203B (en) | 2014-12-29 | 2014-12-29 | Conditioning device for low-temperature multi-effect distillation seawater desalination system and conditioning method thereof |
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| Publication Number | Publication Date |
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| CN104628203A true CN104628203A (en) | 2015-05-20 |
| CN104628203B CN104628203B (en) | 2017-05-24 |
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| CN201410848188.5A Active CN104628203B (en) | 2014-12-29 | 2014-12-29 | Conditioning device for low-temperature multi-effect distillation seawater desalination system and conditioning method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112978829A (en) * | 2021-03-31 | 2021-06-18 | 天津国投津能发电有限公司 | Low-temperature multi-effect distillation seawater desalination system and process method thereof |
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| US8986508B2 (en) * | 2005-03-07 | 2015-03-24 | I.D.E. Technologies Ltd. | Multi-effect evaporator |
| CN204434317U (en) * | 2014-12-29 | 2015-07-01 | 魏刚 | The modifying device of low temperature multiple-effect distillation seawater desalination system |
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2014
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Patent Citations (4)
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| US8986508B2 (en) * | 2005-03-07 | 2015-03-24 | I.D.E. Technologies Ltd. | Multi-effect evaporator |
| CN102180527A (en) * | 2011-03-03 | 2011-09-14 | 中国神华能源股份有限公司 | Water mixing device and sea water desalinizing system comprising same |
| CN102535578A (en) * | 2012-02-27 | 2012-07-04 | 天津大学 | Method for controlling stability of water quality of desalinated sea water and tap water mixed in municipal water supply network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112978829A (en) * | 2021-03-31 | 2021-06-18 | 天津国投津能发电有限公司 | Low-temperature multi-effect distillation seawater desalination system and process method thereof |
| CN112978829B (en) * | 2021-03-31 | 2024-03-12 | 天津国投津能发电有限公司 | Low-temperature multi-effect distillation seawater desalination system and process method thereof |
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| CN104628203B (en) | 2017-05-24 |
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