CN1712143A - Cleaning method of circulating water system - Google Patents
Cleaning method of circulating water system Download PDFInfo
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- CN1712143A CN1712143A CN 200410025486 CN200410025486A CN1712143A CN 1712143 A CN1712143 A CN 1712143A CN 200410025486 CN200410025486 CN 200410025486 CN 200410025486 A CN200410025486 A CN 200410025486A CN 1712143 A CN1712143 A CN 1712143A
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- water system
- circulating water
- purging method
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Abstract
A method for cleaning the water circulating system of centralized air conditioner features that the scale layer is divided into multiple sublayers according to their components, and the proper complex, chelating agent or polyelectrolyte suitable for particular sublayer is chosen to respectively dissolve each sublayer.
Description
Technical field
The invention belongs to chemical field, relate to a kind of purging method of circulating water system, more particularly, the present invention relates to a kind of chemical cleaning method central air-conditioner circulating water system, industrial cooling circulating water system.
Background technology
The matting of at present general cooling water system mainly is to adopt some acid or acid salt to carry out, and these acid or acid salt comprise hydrochloric acid, sulfuric acid, nitric acid, thionamic acid, ammonium bifluoride etc.Wherein with hydrochloric acid use at most.Acid can wash hard scale of being made up of alkaline earth metal carbonate in the hardware and the corrosion product of being made up of metal oxide effectively.The carbonate of these acid and metal or oxide compound reaction make it to change into the soluble metal salt class.Alkali clean be with the chemical agent of strong basicity or alkalescence as clean-out system go to loosen, sedimental class methods in emulsification and the dispersed metal equipment.Alkali cleaning agent commonly used has sodium hydroxide, yellow soda ash, Sodium phosphate dibasic and water glass.Alkali will add tensio-active agent wetting removal grease, dust and biological substance when cleaning simultaneously, to improve cleaning performance.But when adopting acid to clean the alkali cleaning, because the corrodibility that soda acid itself exists also needs to use inhibiter to prevent that locking system sustains damage.
Though present restrainer corrosion mitigating effect is better, most of effective inhibiter all has specificity to a certain extent, promptly only at several metals of certain several acid rust inhibition is arranged.When the system that is cleaned was made up of multiple metal, improper if inhibiter is selected for use, consequence was hardly imaginable.The corrosion mitigating effect of inhibiter is subjected to the restriction of pickling agent concentration still more, if operator's experience is not abundant, add acid or add the method for inhibiter inappropriate, cause the too high or local density of corrosion inhibitor of local acid concentration on the low side, all can make the metal at these positions suffer heavy corrosion.Though alkalescence is cleaned metals such as iron, copper are not had corrosion, metals such as aluminium, zinc are had very big corrodibility, and under the strong basicity environment, be difficult to find a kind of effective inhibiter at aluminium, zinc.So to the recirculating cooling water system of a large amount of galvanized pipes, aluminium heater being arranged, carrying out alkali cleaning is unsuitable.
And, when carrying out pickling, alkali cleaning, because pH value can not bring hidden danger to ordinary production if do not stop production not in the P H scope of the normal operation of system; Moreover the adding of a large amount of pickling medicaments, alkali cleaning medicament and the discharging of the cleaning waste liquid intrasystem part or all of water of all need draining is perhaps formed interim scavenger circuit, and this certainly will require system to stop production.
When mineral acid pickling, alkali cleaning, all have a large amount of dirty pull-ups to fall, the solid particulate of the slabbing that these come off is very easy in the stagnant area of current area deposition, even enters the obstruction that the thinner pipeline of caliber causes this part pipeline with recirculated water.For as this equipment that has than the tubule footpath of central air conditioner system and the equipment of industrial product, the dirt of removing is with regard to very easy blocking pipe.Cause the consequence more serious than fouling.
Along with social productive forces make constant progress and people for the attention of save energy, safety in production, High-efficient Production, traditional chemical cleaning method obviously can not adapt to present requirement, and has certain potential safety hazard in actually operating.Based on the defective of above prior art, the inventor has invented multi-level composite cleaning technique, can effectively address the above problem.
Summary of the invention
Technical problem to be solved by this invention is: traditional chemical cleaning method can not adapt to the requirement of present circulating water system, and has certain potential safety hazard in actually operating.
The technical scheme that the present invention is adopted for solution above-mentioned technical problem of the prior art provides a kind of purging method of circulating water system, the purging method of described this circulating water system is included in the process of carrying out matting in the circulating water system, it is characterized in that: adopt multi-level composite cleaning in the process of described matting, it is characterized in that: adopt multi-level composite cleaning, the dirt layer difference by its composition is divided into a plurality of successive layers, and one deck all dissolves respectively or dispersion and emulsion with different medicaments arbitrarily.
In the circulating water system purging method of the present invention, the medicament that uses is complex compound, sequestrant, polyelectrolyte etc.Further, the complex compound, sequestrant or the polyelectrolyte that use of the present invention can be selected from ethylenediamine tetraacetic acid (EDTA), Sodium salts humic acids, poly-phosphate, the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid partly or entirely.As an optimal way of the present invention, cleaning process can add 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, ethylenediamine tetraacetic acid (EDTA) (EDTA), Sodium salts humic acids and poly-phosphate in order.
Circulating water system purging method of the present invention is applicable to center air-condition circle water system or industrial cooling circulating water system.
In the circulating water system purging method of the present invention, clean generally and under neutrality, subacidity or subalkaline condition, carry out.And circulating water system can be not out of service in the cleaning process.
As one embodiment of the present invention, in cleaning process, add 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP), ethylenediamine tetraacetic acid (EDTA) (EDTA), Sodium salts humic acids and poly-phosphate successively.
HEDP can be dissociated into hydrogen ion and acid radical anion in the aqueous solution, acid radical anion can with metal ion-chelants such as iron, copper, calcium, magnesium, calcium sulfate dirt, silicic acid magne-scale are also had strong cleanup action.It is reported that HEDP and dispersion agent, tensio-active agent are united use, its rust cleaning effect can compare favourably with hydrochloric acid.
It mainly is to utilize it can form the stable chelated agent with metal ions such as calcium, magnesium, iron, copper that EDTA cleans, ferric oxide and copper dirt class settling and calcium magne-scale class all there are stronger removing ability (but should not adopt EDTA to the very high incrustation scale of silicone content), and minimum to corrosion of metal; After the cleaning, the metallic surface can generate good preservative protective film, need not Passivation Treatment separately.The EDTA clean-out system is everlasting and is cleaned in the weakly acidic medium, needs to add suitable inhibiter, if clean under alkaline condition, must add about temperature to 100 ℃.
Sodium salts humic acids is commonly called as natrium humate, is chocolate or black gelatinoid or amorphous end.Water-soluble posthydrolysis generates humic acids and sodium hydroxide.The effect of Sodium salts humic acids is relevant with humic acids, and humic acids is a kind of natural organic high molecular compound, and it contains more all kinds of active groups.These active groups have determined humic acids to have slightly acidic, wetting ability, ion exchangeable, complexing, oxidation-reduction quality and physiologically active etc., not only all kinds of dirty types are had the complexing solvency action, and suspended substance is had dispersion and emulsifying effect.
Poly-phosphate is the good corrosion inhibiting and descaling agent of cooling water system still not, when its concentration is higher (200-1000mg/l), also is a kind of safe clean-out system.Poly-phosphate can form complex compound and make the dirt dissolving on the one hand with metal ions such as calcium, magnesium; On the other hand, poly-phosphate can destroy the incrustation scale crystalline structure, makes dirt become loose, unites use so poly-phosphate is normal with dispersion agents such as polyacrylic acid, hydrolytic polymaleic anhydride, utilizes dispersion agent that the incrustation scale that becomes loose is suspended in the water, with the quickening cleaning speed.
Use circulating water system purging method of the present invention, have lot of advantages:
(1) extent of corrosion is little.Complex compound, sequestrant, polyelectrolyte clean mostly under neutrality or subacidity, subalkaline condition and clean, overwhelming majority complex compound, sequestrant, polyelectrolyte are organism, wherein many still good inhibiter of metal or passivator, so sequestrant, polyelectrolyte cleans is a kind of safest cleaning way.
(2) cleaning that can not stop production.Complex compound, sequestrant, polyelectrolyte then can need not stop production in the whole cleaning process in the interior metallic surface is cleaned of the normal P H scope of moving of system.After some sequestrant (as Sodium salts humic acids), polyelectrolyte (as Sodium hexametaphosphate 99) cleaned and finish, the metallic surface was in passive state, and system need not do the passivation film processing can directly enter normal operating condition.So sequestrant, polyelectrolyte clean and can carry out under the prerequisite that does not influence production, need not Programmed Stop.
(3) remove microorganism dirt efficient height.Major part biocide effect efficiently PH scope is near neutrality or weakly alkaline, so pickling, alkali cleaning are relatively poor to the clearance of microorganism dirt.And the PH scope that complex compound, sequestrant, polyelectrolyte clean is consistent with the PH scope of biocide effect, and can mutually promote, and has the obvious synergistic effect, is that the system effect led is fine to the microorganism dirt.
(4) eluate is difficult for deposition.Complex compound, sequestrant, the product when polyelectrolyte cleans then mainly are three kinds of states: 1. incrustation scale, rust deposite and complexing agent generate water-soluble stable complex compound; 2. solids in the dispersant molecule planar water and make particle charged, the particle of band identical charges repels mutually and makes particle be dispersion state; 3. flocculation agent makes the charged particle of suspension condense mutually in conjunction with forming bigger floss in the mode of putting up a bridge, and the floss density of these short textures approaches water.So just be difficult for precipitating in interchanger, the dirt of removing is not easy blocking pipe.
Embodiment
In a center air-condition circle water system, keep system's normal operating condition, add 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid (HEDP), ethylenediamine tetraacetic acid (EDTA) (EDTA), Sodium salts humic acids and poly-phosphate successively, add sequencing, it is as follows to add concentration, action time:
1-Hydroxy Ethylidene-1,1-Diphosphonic Acid adds 1.5～2 hours action time by 0.1～0.2% the amount that system possesses the water yield;
Ethylenediamine tetraacetic acid (EDTA) is possessed the 1000ppm of the water yield by system amount adds, and be 2～2.5 hours action time;
Sodium salts humic acids is possessed the 300ppm of the water yield by system amount adds, and be 1～1.5 hour action time;
Poly-phosphate is possessed 200～1000ppm of the water yield by system amount adds, and be 2～3 hours action time.
Found that because complexing action and dissemination have taken place, make dirty layer slowly to dissolve or come off, the dirt that washes down is progressively discharged system by the method that increases blowdown flow rate.
In one embodiment of the invention, can also prolong above action time, and whole cleaning process can extend to 300 hours.
Claims (6)
1. the purging method of a circulating water system, be included in the process of carrying out matting in the circulating water system: it is characterized in that: adopt multi-level composite cleaning in the process of described matting, the dirt layer difference by its composition is divided into a plurality of successive layers, and one deck all dissolves respectively or dispersion and emulsion with complex compound, sequestrant or polyelectrolyte arbitrarily.
2. the purging method of circulating water system according to claim 1, it is characterized in that: described circulating water system is center air-condition circle water system or industrial cooling circulating water system.
3. the purging method of circulating water system according to claim 1 and 2 is characterized in that: the complex compound of use, sequestrant or polyelectrolyte be selected from ethylenediamine tetraacetic acid (EDTA), Sodium salts humic acids, poly-phosphate, the 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid partly or entirely.
4. the purging method of circulating water system according to claim 1 and 2, it is characterized in that: cleaning process adds 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, ethylenediamine tetraacetic acid (EDTA), Sodium salts humic acids and poly-phosphate in order.
5. the purging method of circulating water system according to claim 1 and 2 is characterized in that: clean under neutrality, subacidity or subalkaline condition and carry out.
6. the purging method of circulating water system according to claim 1 and 2 is characterized in that: clean under the state of circulating water system operation and carry out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410025486 CN1712143A (en) | 2004-06-25 | 2004-06-25 | Cleaning method of circulating water system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410025486 CN1712143A (en) | 2004-06-25 | 2004-06-25 | Cleaning method of circulating water system |
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| CN1712143A true CN1712143A (en) | 2005-12-28 |
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| CN 200410025486 Pending CN1712143A (en) | 2004-06-25 | 2004-06-25 | Cleaning method of circulating water system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103182389A (en) * | 2011-12-30 | 2013-07-03 | 中国原子能科学研究院 | Physical and chemical mixed cleaning process for reactor heat exchanger |
| CN103562144A (en) * | 2011-04-14 | 2014-02-05 | 巴斯夫欧洲公司 | Method of dissolving and/or inhibiting the deposition of scale on surface of system |
| CN103912955A (en) * | 2012-12-31 | 2014-07-09 | 王炜 | Online monitored, prejudged and controlled medicine adding system of central air-conditioning water system and application thereof |
| CN105484322A (en) * | 2015-12-23 | 2016-04-13 | 武汉广益交通科技股份有限公司 | Anti-freezing preservative for cold region tunnel fire protection and use method thereof |
| CN112608005A (en) * | 2020-11-25 | 2021-04-06 | 湖南鑫远环境科技股份有限公司 | Method for recovering struvite from municipal sludge |
-
2004
- 2004-06-25 CN CN 200410025486 patent/CN1712143A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103562144A (en) * | 2011-04-14 | 2014-02-05 | 巴斯夫欧洲公司 | Method of dissolving and/or inhibiting the deposition of scale on surface of system |
| US9382139B2 (en) | 2011-04-14 | 2016-07-05 | Basf Se | Method of dissolving and/or inhibiting the deposition of scale on a surface of a system |
| CN103182389A (en) * | 2011-12-30 | 2013-07-03 | 中国原子能科学研究院 | Physical and chemical mixed cleaning process for reactor heat exchanger |
| CN103182389B (en) * | 2011-12-30 | 2016-01-27 | 中国原子能科学研究院 | Physical and chemical mixed cleaning process for reactor heat exchanger |
| CN103912955A (en) * | 2012-12-31 | 2014-07-09 | 王炜 | Online monitored, prejudged and controlled medicine adding system of central air-conditioning water system and application thereof |
| CN103912955B (en) * | 2012-12-31 | 2016-08-10 | 上海洗霸科技股份有限公司 | Central air conditioning water system on-line monitoring anticipation controls medicine system and application thereof |
| CN105484322A (en) * | 2015-12-23 | 2016-04-13 | 武汉广益交通科技股份有限公司 | Anti-freezing preservative for cold region tunnel fire protection and use method thereof |
| CN112608005A (en) * | 2020-11-25 | 2021-04-06 | 湖南鑫远环境科技股份有限公司 | Method for recovering struvite from municipal sludge |
| CN112608005B (en) * | 2020-11-25 | 2023-01-06 | 湖南鑫远环境科技股份有限公司 | Method for recovering struvite from municipal sludge |
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