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CN202415287U - Quality adjusting device of water produced by desalination of seawater - Google Patents

Quality adjusting device of water produced by desalination of seawater Download PDF

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Publication number
CN202415287U
CN202415287U CN2011205239843U CN201120523984U CN202415287U CN 202415287 U CN202415287 U CN 202415287U CN 2011205239843 U CN2011205239843 U CN 2011205239843U CN 201120523984 U CN201120523984 U CN 201120523984U CN 202415287 U CN202415287 U CN 202415287U
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China
Prior art keywords
water
inhibiter
desalination
line mixer
sea water
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Expired - Lifetime
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CN2011205239843U
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Chinese (zh)
Inventor
汪洋
汪亮亮
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HUBEI JIADE TECHNOLOGY Co Ltd
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Individual
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Abstract

The utility model discloses a quality adjusting device of water produced by desalination of seawater. The quality adjusting device comprises a water outlet pipeline of the water produced by desalination of the seawater, and is characterized in that a pipeline mixer I and a pipeline mixer II are connected to the water outlet pipeline in series, the pipeline mixer I is connected with an alkali dosing unit, and the pipeline mixer II is connected with a corrosion inhibitor dosing unit; and a pH meter is arranged behind the pipeline mixer I, and a corrosion inhibitor concentration gauge is arranged behind the pipeline mixer II. The water quality adjusting device disclosed by the utility model can effectively adjust the water quality of the water produced by desalination of the seawater and reduce the corrosiveness of the water; the system can realize online monitoring and real-time adjustment; and the device has a simple structure, can be realized by simply transforming a water outlet pipeline system of the water produced by desalination of the seawater and further has industrial application and popularization value.

Description

The modifying device of water is produced in a kind of sea water desaltination
Technical field
The utility model belongs to field of sea water desalting technology; Relate to embrane method sea water distiling plant or similar strong brine treatment unit; Particularly relate to the modifying device that a kind of embrane method sea water distiling plant produces water; Be used to have stronger corrosive desalination to produce water before getting into the user, carry out effective modifier treatment.
Background technology
In the embrane method desalting process, the suspended substance in the seawater and most of dissolved salts material are removed, and product water TDS (total dissolved solid) is lower than 350mg/L, wherein mainly are monovalence salts such as NaCl, and calcium, magnesium salts content (hardness) are very low; Owing to contain free carbon dioxide, this water is slightly acidic, and the pH value is reduced to below 6, the Langelier index ( LSI) significantly less than zero; Simultaneously, contain the dissolved oxygen of higher concentration and the NaClO of 0.3ppm in this water.Therefore, when product water supplied the user to use, to the metallic substance in user's production unit or the watering equipment, particularly carbon steel piping inwall, copper alloy internals surface had stronger corrodibility; When water was in flow state, its corrodibility maybe be stronger.
The fouling tendency of water adopts bright Greer SI (LSI) to predict usually.LSI is an evaluation, is used for predicting the stability of lime carbonate in the water: balance is perhaps kept in deposition, dissolving.LSI just equals the poor of actual pH and saturated pHs value (the pH value of unsaturated carbonate calcium solution), LSI=pH – pHs.If actual pH is lower than pHs, LSI is for negative, then the fouling tendency of water very a little less than, but corrosion tendency strengthens.If actual pH is greater than pHs, then LSI is for just, because contain oversaturated CaCO in the water 3, the fouling tendency aggravation.The LSI positive is high more, and fouling danger is high more.
Usually control CaCO 3The condition of fouling is:
LSI 0, need not add Scale inhibitors;
LSI≤1.8~2.0 add Scale inhibitors separately or adopt chemical tendering fully;
LSI>1.8~2.0, add acid and reach 1.8~2.0 to LSI, and then add Scale inhibitors; Or adopt chemical tendering fully.
Abroad through to filling CO 2After one-level RO product water (Reverses Osmosis, reverse osmosis water) in add 80mg/L milk of lime mode neutralize, improve its bright Greer SI (LSI) value and reach 0~0.5.The processing of domestic related fields is in blank.Cause system unstable owing to adopt the lime system to regulate the properties influence that receives lime, effect is not very desirable, and environmental protection aspect problem is more, and the user is different to water quality requirement.In addition, when modified, producing more white powder deposition, when carrying out practical application, also need necessary, feasible separating measure with lime.
Existing sea water distiling plant produces water, and the user in the life-time service process heavy corrosion possibly take place, and in order to guarantee the long-term reliability of custom system, must carry out the processing of protection against corrosion water quality regulation to producing water.So sea water desaltination product water needs a kind of environmental protection, stable hardening and tempering method and device.
Summary of the invention
The purpose of the utility model provides the modifying device that a kind of sea water distiling plant produces water; Can simply transform sea water distiling plant of the prior art and realize; When guaranteeing that water resistance dirt performance is produced in desalination; Through the pH value of adjustment product water, and, obtain best preservative effect according to water quality situation adding sustained release dosage.
The technical scheme of the utility model is:
The modifying device of water is produced in a kind of sea water desaltination, comprises sea water desaltination product water outlet conduit, it is characterized in that; On described outlet conduit; Series connection line mixer I and line mixer II, line mixer I connect alkali dosing unit, and the line mixer II connects inhibiter dosing unit; The pH table is set after the line mixer I, the density of corrosion inhibitor table is set after the line mixer II.
Described alkali dosing unit comprises alkali storage tank and alkali volume pump, and described inhibiter dosing unit comprises inhibiter storage tank and inhibiter volume pump.
Described sea water desaltination is produced on the water outlet conduit under meter is set.
Described device is controlled by the PLC system.
Use the described sea water desaltination of the utility model to produce the modifying device of water, can produce water water quality to sea water desaltination and effectively regulate, reduce its corrodibility, hardening and tempering method comprises the steps:
1. through the line mixer I, directly in desalination water producing pipe road system, adding concentration by the alkali volume pump is the NaOH solution of 38%-40%wt;
2. regulate desalination and produce water pH value between the 8-9, the pH value is by the monitoring of the table of the pH in the tubing system;
3. through the line mixer II, directly in desalination product water, add inhibiter in the tubing system by the inhibiter volume pump; Inhibiter is the phosphoric acid salt inhibiter, like sodium phosphate, Sodium hexametaphosphate 99, tripoly phosphate sodium STPP etc.The dose that adds of phosphoric acid salt inhibiter is preferably 280-320ppm, and the dose that adds of inhibiter is monitored by the density of corrosion inhibitor table in the system;
4. obtain modified water outlet behind the uniform mixing.
The modifying device that water is produced in described sea water desaltination is applicable to that it is 320~350mg/L that water TDS is produced in the desalination of processing, pH≤6.
The utility model method can be produced on the basis that water outlet conduit system simply transforms at sea water distiling plant and realized; To desalinate and produce the water pH regulator to weakly alkaline; Add inhibiter simultaneously, produce water to the corrosion of metal effect, keep producing the scale-inhibiting properties of water simultaneously effectively to prevent desalination.
The beneficial effect of the utility model: the modifying device of the sea water desaltination product water of the utility model can produce water water quality to sea water desaltination and effectively regulate, and reduces its corrodibility, regulates and the adding sustained release dosage through the pH value, obtains best preservative effect.Specifically comprise: the 1. simple pH value of regulating water that relies in 30 days time, reaches 67.7%, 83.5% respectively to the corrosion inhibition rate of 20# steel and copper alloy; When 2. regulating the pH value, added the inhibiter of 280-320ppm, in 30 days time, 20# steel and copper alloy have all been had good corrosion inhibiting effect, corrosion inhibition rate reaches 84.7%, 89.5% respectively.3. suffering under the situation of erosion corrosion, regulating the pH value and adding the inhibiter method also has tangible corrosion mitigating effect, and under the flow velocity of 2m/s, inhibition efficiency is respectively 82.5%, 87.7%, and under the flow velocity of 3m/s, inhibition efficiency is respectively 76.5%, 82.6%.4. regulate the pH value and add the erosion corrosion speed that the inhibiter method can significantly reduce 20# steel and steel alloy, can satisfy the process water requirement fully.
In addition, the aeration water quality regulating device of the utility model is simple in structure, sea water distiling plant is produced water outlet conduit system simply transform promptly and can realize, has the promotional value of industrial applications.
Below in conjunction with specific embodiment the utility model is described in detail.The protection domain of the utility model does not exceed with embodiment, but is limited claim.
Description of drawings
Fig. 1 is the structural representation that the water modifying device is produced in the sea water desaltination of the utility model.
Embodiment
A kind of sea water distiling plant produces the modifying device of water, can realize that on existing sea water distiling plant be applicable to that TDS is 320~350mg/L, water is produced in the desalination of pH≤6.
Specifically install referring to Fig. 1.Modifying device produces on the water outlet conduit in sea water desaltination, and series connection line mixer I and line mixer II, line mixer I connect alkali dosing unit, and the line mixer II connects inhibiter dosing unit.Desalination is produced rate of flow meter, pH table and density of corrosion inhibitor table is set respectively on the water outlet conduit, after the pH table is arranged on the line mixer I, after the density of corrosion inhibitor table is arranged on the line mixer II.
Described alkali dosing unit comprises alkali storage tank and alkali volume pump, and dosing mouth and whisking appliance are arranged on the alkali storage tank, and the alkali storage tank is connected with the line mixer I through pipeline with the alkali volume pump.
Described inhibiter dosing unit comprises inhibiter storage tank and inhibiter volume pump, and dosing mouth and whisking appliance are arranged on the inhibiter storage tank, and the inhibiter storage tank is connected with the line mixer II through pipeline with the inhibiter volume pump.
Modifying device is implemented in line traffic control by the PLC system.
Use described device sea water distiling plant product water carried out modifier treatment, specifically may further comprise the steps:
1, produces the water yield and the water quality regulation pH value of water according to sea water desaltination
According to the water production rate of sea water desaltination, accounting needs the amount of the NaOH of adding, and in the line mixer I in the alkali volume pump adding system, the pH value maintains 8-9, monitors through in-line meter.
2, produce the water yield and the water quality regulation sustained release dosage concentration of water according to sea water desaltination
According to the water production rate of sea water desaltination, accounting needs the amount of the inhibiter of adding, and in the line mixer II in the inhibiter volume pump adding system, density of corrosion inhibitor maintains 280~320ppm, monitors through in-line meter.
3, on-line monitoring and adjustment in real time guarantee optimal ph and slowly-releasing agent concentration
System can be adjusted by the PLC system through the correlation parameters such as flow, pH value, density of corrosion inhibitor of monitoring in real time, guarantees the pH value and the slowly-releasing agent concentration of the best.
Embodiment 1
Design utilizes 150m 3/ h sea water desaltination is produced water and is done industrial system water moisturizing, and the industrial system pipeline is the 20# carbon steel, in the tubing system instrument in respect of copper material, flow 2.3m/s.
On the outlet conduit of sea water distiling plant, adopt the modifying device shown in accompanying drawing 1.Though flow system flow is stable, producing water water quality has certain fluctuation, and the pH value is set to 8-9; The dose that adds of inhibiter is provided with 280-320ppm; NaOH and phosphoric acid salt inhibiter are joined in the system by the line mixer in the tubing system through WT-MSR, concentration is taked on-line monitoring, in real time adjustment.
Device is through 40 days continuous operation, and about sea water desaltination product water TDS330mg/L, under the situation of pH value about 6, water flow velocity 2-2.5m/s, 20# steel lacing film inhibition efficiency is 82.7%, and copper alloy lacing film inhibition efficiency is 86.8%.
Embodiment 2
Design utilizes 100m 3The process system that water is done water for fire-fighting purpose is produced in/h sea water desaltination, and fire protection pipeline is the 20# carbon steel, and the equipment of copper alloy material is arranged in the fire-extinguishing system, and flow system flow has fluctuation.
On the outlet conduit of sea water distiling plant, adopt the modifying device shown in accompanying drawing 1.Because flow system flow is unstable, system takes time variable control, and the pH value is set to 8-9; The dose that adds of inhibiter is provided with 280-320ppm; NaOH and phosphoric acid salt inhibiter are joined in the system by the line mixer in the tubing system through WT-MSR, concentration is taked on-line monitoring, in real time adjustment.
Device is through 30 days continuous operation, and about sea water desaltination product water TDS320mg/L, under the situation of pH value about 6, water flow velocity 1-3m/s, 20# steel and copper alloy lacing film inhibition efficiency are respectively 82.5%, 88.9%.

Claims (4)

1. the modifying device of a sea water desaltination product water comprises sea water desaltination product water outlet conduit, it is characterized in that; On described outlet conduit; Series connection line mixer I and line mixer II, line mixer I connect alkali dosing unit, and the line mixer II connects inhibiter dosing unit; The pH table is set after the line mixer I, the density of corrosion inhibitor table is set after the line mixer II.
2. the modifying device of water is produced in sea water desaltination according to claim 1, it is characterized in that described alkali dosing unit comprises alkali storage tank and alkali volume pump, and described inhibiter dosing unit comprises inhibiter storage tank and inhibiter volume pump.
3. the modifying device of water is produced in sea water desaltination according to claim 1, it is characterized in that, described sea water desaltination is produced on the water outlet conduit under meter is set.
4. the modifying device of water is produced in sea water desaltination according to claim 1, it is characterized in that described device is controlled by the PLC system.
CN2011205239843U 2011-12-15 2011-12-15 Quality adjusting device of water produced by desalination of seawater Expired - Lifetime CN202415287U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102603034A (en) * 2011-12-15 2012-07-25 汪洋 Method and device for regulating quality of desalinated sea water

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102603034A (en) * 2011-12-15 2012-07-25 汪洋 Method and device for regulating quality of desalinated sea water

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Owner name: ZHOU TAOHONG

Free format text: FORMER OWNER: WANG YANG

Effective date: 20140130

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Inventor after: Zhou Taohong

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Effective date of registration: 20140130

Address after: 430000 Jiayuan B4-4-601, Jiayuan Road, Hubei, Wuhan

Patentee after: Zhou Taohong

Address before: 430074 Hubei city of Wuhan province East Lake Development Zone Luoyu Road, Optics Valley international A No. 456 floor 11 No. 12

Patentee before: Wang Yang

Patentee before: Wang Liangliang

TR01 Transfer of patent right
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Effective date of registration: 20170707

Address after: 430014 East Lake hi tech Development Zone, Wuhan, two hi tech Road No. 388, Wuhan Optics Valley international bio pharmaceutical enterprise accelerator No. 1-2, No. twentieth, 5, 1, No.

Patentee after: Hubei Jiade Technology Co., Ltd.

Address before: 430000 Jiayuan B4-4-601, Jiayuan Road, Hubei, Wuhan

Patentee before: Zhou Taohong

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CX01 Expiry of patent term

Granted publication date: 20120905