CN102730845B - Method for reusing recycled water in circulating cooling water - Google Patents
Method for reusing recycled water in circulating cooling water Download PDFInfo
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Abstract
The present invention relates to method for reusing recycled water in circulating cooling water. The method is characterized by comprising steps of: a) adding zinc salt in water through a water outlet of a recycled water production device; b) adding corrosion inhibitor containing phosphorus into water when an original total phosphate concentration (calculated by PO43) of the recycled water is less than 1mg / L; c) adding the treated water as supplement water into a circulating cooling water system; and d) adding a copolymer scale inhibition dispersing agent into the circulating cooling water. The method of the invention has good corrosion inhibition effect on recycled water pipe to guarantee safe transportation of the recycled water; besides, the method can utilize existing phosphorus in the water to reduce drug dosage and treatment cost in circulating cooling water treatment.
Description
Technical field
The present invention relates to a kind of method of middle water reuse, relate to particularly a kind of middle water and be back to the method for recirculated cooling water.
Background technology
China's gross amount of water resources ranks the world the 6th, but the occupancy volume per person of water resources is only 1/4th of world's per capita share, the 88, the row whole world.Along with growth and the expanding economy of population, the demand of China's water resources is still in continuous increase.Under the environment of current shortage of water resources, in order to realize the sustainable use of water resources, finding a kind of second water source that reliably, can reuse becomes the important channel of current solution water shortage problem.
Middle water mainly refers to that municipal effluent or sanitary sewage reach certain water quality standard after treatment, reusable undrinkable water within the specific limits, and its water-quality guideline, lower than drinking water standard, allows to enter the emission standard of surface water body higher than sewage.Middle water reuse has been implemented for a long time abroad, and reuse is on a grand scale, and has demonstrated obvious economic benefit.The states such as the U.S., Japan, India, Britain, Israel, all according to this country or regional feature, have determined the technology of middle water recycle that is applicable to its national conditions and strength, and technology of middle water recycle is more and more reached perfection.In recent ten years, China also comes to realise importance and the urgency of middle water reuse.Significant effect, as all built middle water reuse project in Shenzhen, Beijing, Qingdao, Tianjin, Taiyuan etc., and has been obtained in many cities, the whole nation.
China's industrial water consumption is huge, and wherein again with circulating cooling water consumption proportion maximum, and recirculating cooling water system is lower slightly compared with other production processes to the water quality requirement of its make up water.Therefore, Jiang Zhongshui is back to industrial circulating cooling water, not only can save a large amount of fresh waters, and can effectively alleviate town water imbalance between supply and demand.
There is certain gap in middle water water quality and fresh water, its corrodibility is better than general fresh water.In middle water course of conveying, usually there is the phenomenon of corrosive pipeline.Corrosive pipeline not only can cause that tube wall attenuation and perforation leak, and shortens pipeline work-ing life, reduces pipeline water delivery ability and increases water delivery energy consumption etc., and can cause middle water water quality variation, increases follow-up use difficulty.Anticorrosion for water pipe, generally can take following measure: (1) adopts non-metal pipe (as: reinforced concrete pipe, polyvinyl chloride pipe etc.); (2) pipeline is carried out to coated lining (as: cement-mortar lining, epoxy resin coated lining etc.); (3) galvanic protection (as: consumable anode material method, impressed current method etc.).At present, there is some problems for the conveying of water in aforesaid method on preservative effect, Financial cost and technology maturity.Especially anticorrosion for built intermediate water pipeline, does not also have a kind of countermeasure that solves reliably now.
Summary of the invention
The present invention relates to a kind of method that middle water is back to recirculated cooling water, be back to the etching problem of recirculating cooling water system after recirculated cooling water in order to the corrosive pipeline problem in water course of conveying in comprehensive solution and Zhong Shui.
For achieving the above object, the invention provides a kind of middle water and be back to the method for recirculated cooling water, comprising: a), at the water outlet of middle water production equipment, in Xiang Zhongshui, add zinc salt; B) in the middle of in water the concentration of original total phosphate (with PO
4 3-meter) when not enough 1mg/L, in Xiang Zhongshui, add containing phosphor corrosion inhibitor; C) by middle water after treatment as a supplement water add in recirculating cooling water system; D) in recirculated cooling water, add copolymer anti-scale disperser.
Zinc salt of the present invention is selected from zinc sulfate and zinc chloride, and described zinc sulfate, preferably from Zinc vitriol, adds in Xiang Zhongshui after zinc salt, and in middle water, the concentration of zinc salt is (with Zn
2+meter) be 0.2-1.0mg/L.
The phosphor corrosion inhibitor that contains of the present invention is selected from inorganic phosphorated inhibiter and organic containing phosphor corrosion inhibitor; Preferably from phosphoric acid salt, poly-phosphate and organic phospho acid; More preferably from SODIUM PHOSPHATE, MONOBASIC (potassium), Sodium phosphate dibasic (potassium), sodium phosphate (potassium), Sodium hexametaphosphate 99, tripoly phosphate sodium STPP, hydroxy ethylene diphosphonic acid, 2-phosphono-containing butane-1,2,4-tricarboxylic acid, 2-hydroxyl phosphino-acetic acid, Amino Trimethylene Phosphonic Acid, ethylenediamine tetramethylene phosphonic acid and diethylenetriamine pentamethylenophosphonic acid(DTPP), most preferably from SODIUM PHOSPHATE, MONOBASIC (potassium), Sodium hexametaphosphate 99, hydroxy ethylene diphosphonic acid and 2-phosphono-containing butane-1,2,4-tricarboxylic acid.In Xiang Zhongshui, add containing after phosphor corrosion inhibitor, in middle water, the concentration of total phosphate is (with PO
4 3-meter) be 1.0-3.0mg/L.
Copolymer anti-scale disperser of the present invention is selected from containing ester group and/or containing sulfonic group multipolymer.Preferably from acrylic acid/esters multipolymer, vinylformic acid/2 '-acrylamide-2-methyl propane sulfonic multipolymer, acrylic acid/esters/2 '-acrylamide-2-methyl propane sulfonic multipolymer, vinylformic acid/sodium allyl sulfonate multipolymer and toxilic acid/Styrene Sulfonic Acid Copolymer.Described acrylate is preferably from vinylformic acid C
1-8ester, more preferably from methyl acrylate, ethyl propenoate and Propylene glycol monoacrylate.Effectively the add concentration of copolymer anti-scale disperser in recirculated cooling water is 5-20mg/L.
Method of the present invention compared with the existing technology has the following advantages: (1) can solve in corrosive pipeline problem in water course of conveying, the safety that in guarantee, water is carried; (2) can utilize in existing phosphorus in water, thereby reduce chemical feeding quantity and the processing cost of circulating cooling water treatment.
Embodiment
The following examples and comparative example will contribute to illustrate that middle water involved in the present invention is back to the method for recirculated cooling water and is applied to the corrosion mitigating effect of middle water transport pipe and recirculating cooling water system, but do not limit to its scope.
The present invention carries out corrosion evaluation test with reference to National Standard of the People's Republic of China GB/T 18175-2000 " mensuration-rotary hanging plate method of water conditioner corrosion inhibition " to following examples and comparative example.In to the test of intermediate water pipeline conveying corrosion evaluation: test temperature is 30 DEG C; Test piece rotating speed is 120rpm; Test period is 72h; Test piece material is 20
#carbon steel.In to the test of recirculating cooling water system corrosion evaluation: test temperature is 45 DEG C; Test piece rotating speed is 75rpm; Test period is 72h; Test piece material is 20# carbon steel.Test with in the former water of water and tap water quality in table 1.
Table 1 test water water quality
| Project | The former water of middle water | Tap water |
| COD/(mg/L) | 22 | / |
| Ca 2+/(mg/L) | 236.6 | 188.5 |
| Total hardness/(mg/L) | 351.0 | 303.2 |
| Total alkalinity/(mg/L) | 239.1 | 217.4 |
| Cl -/(mg/L) | 95.8 | 41.46 |
| SO 4 2-/(mg/L) | 116.1 | 78.7 |
| Specific conductivity/(μ S/cm) | 1004 | 675 |
| pH | 7.86 | 7.44 |
| Total phosphorus/(mg/L) | 0.69 | 0 |
| Positive phosphorus/(mg/L) | 0.58 | 0 |
| Zn 2+/(mg/L) | 0.16 | 0 |
Note: Ca
2+, total alkalinity, total hardness be all with CaCO
3meter; Total phosphorus, positive phosphorus are all with PO
4 3-meter.
Embodiment 1
In the former water of middle water, add potassium primary phosphate and Zinc vitriol, make total phosphate and zinc salt concentration in water be respectively 2.88mg/L and 0.85mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with potassium primary phosphate and Zinc vitriol is concentrated to 5 times under the condition of pH=7.5 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and Propylene glycol monoacrylate is 4: 1 to add vinylformic acid/Propylene glycol monoacrylate multipolymer, Limiting Viscosity 30 DEG C time is 0.071dL/g) 20mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 2
In the former water of middle water, add Sodium phosphate dibasic and zinc chloride, make total phosphate and zinc salt concentration in water be respectively 1.95mg/L and 0.43mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with Sodium phosphate dibasic and zinc chloride is concentrated to 4 times under the condition of pH=7.8 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and 2 '-acrylamide-2-methyl propane sulfonic is 5: 1 to add vinylformic acid/2 '-acrylamide-2-methyl propane sulfonic multipolymer, Limiting Viscosity 30 DEG C time is 0.068dL/g) 12mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 3
In the former water of middle water, add sodium phosphate and zinc chloride, make total phosphate and zinc salt concentration in water be respectively 1.37mg/L and 0.55mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with sodium phosphate and zinc chloride is concentrated to 5 times under the condition of pH=7.5 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid, Propylene glycol monoacrylate and 2 '-acrylamide-2-methyl propane sulfonic is 7: 2: 1 to add vinylformic acid/Propylene glycol monoacrylate/2 '-acrylamide-2-methyl propane sulfonic multipolymer, Limiting Viscosity 30 DEG C time is 0.087dL/g) 14mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 4
In the former water of middle water, add Sodium hexametaphosphate 99 and Zinc vitriol, make total phosphate and zinc salt concentration in water be respectively 1.86mg/L and 0.53mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with tripoly phosphate sodium STPP and Zinc vitriol is concentrated to 4 times under the condition of pH=7.9 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and methyl acrylate is 3: 1 to add vinylformic acid/methyl acrylate copolymer, Limiting Viscosity 30 DEG C time is 0.085dL/g) 15mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 5
In the former water of middle water, add tripoly phosphate sodium STPP and Zinc vitriol, make total phosphate and zinc salt concentration in water be respectively 2.05mg/L and 0.92mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with Sodium hexametaphosphate 99 and Zinc vitriol is concentrated to 5 times under the condition of pH=7.6 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid, ethyl propenoate and 2 '-acrylamide-2-methyl propane sulfonic is 5: 3: 2 to add vinylformic acid/ethyl propenoate/2 '-acrylamide-2-methyl propane sulfonic multipolymer, Limiting Viscosity 30 DEG C time is 0.083dL/g) 12mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 6
In the former water of middle water, add hydroxy ethylene diphosphonic acid and zinc chloride, make total phosphate and zinc salt concentration in water be respectively 2.63mg/L and 0.48mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with hydroxy ethylene diphosphonic acid and zinc chloride is concentrated to 5 times under the condition of pH=7.7 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid, methyl acrylate and 2 '-acrylamide-2-methyl propane sulfonic is 6: 2: 2 to add vinylformic acid/methyl acrylate/2 '-acrylamide-2-methyl propane sulfonic multipolymer, Limiting Viscosity 30 DEG C time is 0.080dL/g) 18mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 7
In the former water of middle water, add 2-phosphono-containing butane-1,2,4-tricarboxylic acid and Zinc vitriol, make total phosphate and zinc salt concentration in water be respectively 2.20mg/L and 0.63mg/L, carries out intermediate water pipeline carry corrosion evaluation test with this.By above-mentioned 2-phosphono-containing butane-1 that is added with, 2, the middle water of 4-tricarboxylic acid and Zinc vitriol concentrates 4 times under the condition of pH=8.2 ± 0.1, (in multipolymer, the mass ratio of toxilic acid and styrene sulfonic acid is 4: 1 to add toxilic acid/Styrene Sulfonic Acid Copolymer, Limiting Viscosity 30 DEG C time is 0.076dL/g) 11mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 8
In the former water of middle water, add 2-hydroxyl phosphino-acetic acid and Zinc vitriol, make total phosphate and zinc salt concentration in water be respectively 1.79mg/L and 0.55mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with 2-hydroxyl phosphino-acetic acid and Zinc vitriol is concentrated to 3 times under the condition of pH=8.5 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and ethyl propenoate is 3: 1 to add vinylformic acid/ethyl acrylate copolymer, Limiting Viscosity 30 DEG C time is 0.078dL/g) 12mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 9
In the former water of middle water, add Amino Trimethylene Phosphonic Acid and Zinc vitriol, make total phosphate and zinc salt concentration in water be respectively 2.78mg/L and 0.58mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with Amino Trimethylene Phosphonic Acid and Zinc vitriol is concentrated to 2 times under the condition of pH=9.0 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid, Propylene glycol monoacrylate and 2 '-acrylamide-2-methyl propane sulfonic is 6: 3: 1 to add vinylformic acid/Propylene glycol monoacrylate/2 '-acrylamide-2-methyl propane sulfonic multipolymer, Limiting Viscosity 30 DEG C time is 0.077dL/g) 5mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 10
In the former water of middle water, add ethylenediamine tetramethylene phosphonic acid and zinc chloride, make total phosphate and zinc salt concentration in water be respectively 1.50mg/L and 0.30mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with ethylenediamine tetramethylene phosphonic acid and zinc chloride is concentrated to 4 times under the condition of pH=8.0 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and 2 '-acrylamide-2-methyl propane sulfonic is 4: 1 to add vinylformic acid/2 '-acrylamide-2-methyl propane sulfonic multipolymer, Limiting Viscosity 30 DEG C time is 0.069dL/g) 8mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 11
In the former water of middle water, add diethylenetriamine pentamethylenophosphonic acid(DTPP) and zinc chloride, make total phosphate and zinc salt concentration in water be respectively 1.13mg/L and 0.25mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with diethylenetriamine pentamethylenophosphonic acid(DTPP) and zinc chloride is concentrated to 5 times under the condition of pH=7.7 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and sodium allyl sulfonate is 3: 1 to add vinylformic acid/sodium allyl sulfonate multipolymer, Limiting Viscosity 30 DEG C time is 0.086dL/g) 10mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 12
Be potassium primary phosphate and the hydroxy ethylene diphosphonic acid of 1: 2 to adding mass ratio in the former water of middle water, making the total phosphate concentration in water is 1.64mg/L.In the former water of middle water, add zinc chloride again, making the zinc salt concentration in water is 0.56mg/L.Carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with potassium primary phosphate, hydroxy ethylene diphosphonic acid and zinc chloride is concentrated to 5 times under the condition of pH=7.6 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and Propylene glycol monoacrylate is 4: 1 to add vinylformic acid/Propylene glycol monoacrylate multipolymer, Limiting Viscosity 30 DEG C time is 0.075dL/g) 14mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 13
Be SODIUM PHOSPHATE, MONOBASIC and the Sodium hexametaphosphate 99 of 1: 1 to adding mass ratio in the former water of middle water, making the total phosphate concentration in water is 2.31mg/L.In the former water of middle water, add Zinc vitriol again, making the zinc salt concentration in water is 0.82mg/L.Carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with SODIUM PHOSPHATE, MONOBASIC, Sodium hexametaphosphate 99 and Zinc vitriol is concentrated to 3 times under the condition of pH=7.8 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and 2 '-acrylamide-2-methyl propane sulfonic is 7: 2: 1 to add vinylformic acid/2 '-acrylamide-2-methyl propane sulfonic multipolymer, Limiting Viscosity 30 DEG C time is 0.088dL/g) 12mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 14
Be 2-hydroxyl phosphino-acetic acid and 2-phosphono-containing butane-1 of 3: 1 to adding mass ratio in the former water of middle water, 2,4-tricarboxylic acid, making the total phosphate concentration in water is 1.36mg/L.In the former water of middle water, add Zinc vitriol again, making the zinc salt concentration in water is 0.38mg/L.Carry out intermediate water pipeline with this and carry corrosion evaluation test.By above-mentioned 2-hydroxyl phosphino-acetic acid, 2-phosphono-containing butane-1 of being added with, 2, the middle water of 4-tricarboxylic acid and Zinc vitriol concentrates 4 times under the condition of pH=7.9 ± 0.1, (in multipolymer, the mass ratio of toxilic acid and styrene sulfonic acid is 3: 1 to add toxilic acid/Styrene Sulfonic Acid Copolymer, Limiting Viscosity 30 DEG C time is 0.091dL/g) 11mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 15
In the former water of middle water, add diethylenetriamine pentamethylenophosphonic acid(DTPP) and zinc chloride, make total phosphate and zinc salt concentration in water be respectively 2.04mg/L and 0.62mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with diethylenetriamine pentamethylenophosphonic acid(DTPP) and zinc chloride is concentrated to 5 times under the condition of pH=8.2 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and methyl acrylate is 3: 1 to add vinylformic acid/methyl acrylate copolymer, Limiting Viscosity 30 DEG C time is 0.072dL/g) 6mg/L, (in multipolymer, the mass ratio of vinylformic acid and 2 '-acrylamide-2-methyl propane sulfonic is 4: 1 to add vinylformic acid/2 '-acrylamide-2-methyl propane sulfonic multipolymer again, Limiting Viscosity 30 DEG C time is 0.077dL/g) 6mg/L, carry out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 16
In the former water of middle water, add Sodium hexametaphosphate 99 and Zinc vitriol, make total phosphate and zinc salt concentration in water be respectively 1.43mg/L and 0.59mg/L, carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with Sodium hexametaphosphate 99 and Zinc vitriol is concentrated to 4 times under the condition of pH=7.5 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and ethyl propenoate is 3: 1 to add vinylformic acid/ethyl acrylate copolymer, Limiting Viscosity 30 DEG C time is 0.072dL/g) 9mg/L, (in multipolymer, the mass ratio of vinylformic acid and sodium allyl sulfonate is 4: 1 to add vinylformic acid/sodium allyl sulfonate multipolymer again, Limiting Viscosity 30 DEG C time is 0.068dL/g) 3mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Embodiment 17
Be SODIUM PHOSPHATE, MONOBASIC and the 2-hydroxyl phosphino-acetic acid of 2: 1 to adding mass ratio in the former water of middle water, making the total phosphate concentration in water is 1.59mg/L.In the former water of middle water, add zinc chloride again, making the zinc salt concentration in water is 0.47mg/L.Carry out intermediate water pipeline with this and carry corrosion evaluation test.The above-mentioned middle water that is added with SODIUM PHOSPHATE, MONOBASIC, 2-hydroxyl phosphino-acetic acid and zinc chloride is concentrated to 4 times under the condition of pH=8.0 ± 0.1, (in multipolymer, the mass ratio of vinylformic acid and Propylene glycol monoacrylate is 4: 1 to add vinylformic acid/Propylene glycol monoacrylate multipolymer, Limiting Viscosity 30 DEG C time is 0.081dL/g) 12mg/L, (in multipolymer, the mass ratio of toxilic acid and styrene sulfonic acid is 4: 1 to add toxilic acid/Styrene Sulfonic Acid Copolymer again, Limiting Viscosity 30 DEG C time is 0.086dL/g) 3mg/L, carries out the test of recirculating cooling water system corrosion evaluation with this.Twice test-results is in table 2.
Comparative example 1
Do not adding under the condition of water treatment agent, the former water of Yi Zhongshui carries out pipeline and carries corrosion evaluation test, the results are shown in Table 2.
Comparative example 2
In the former water of middle water, add SODIUM PHOSPHATE, MONOBASIC, making the total phosphate concentration in water is 1.78mg/L, carries out intermediate water pipeline carry corrosion evaluation test with this, the results are shown in Table 2.
Comparative example 3
In the former water of middle water, add SODIUM PHOSPHATE, MONOBASIC, making the total phosphate concentration in water is 2.75mg/L, carries out intermediate water pipeline carry corrosion evaluation test with this, the results are shown in Table 2.
Comparative example 4
In the former water of middle water, add Zinc vitriol, making the zinc salt concentration in water is 0.55mg/L, carries out intermediate water pipeline carry corrosion evaluation test with this, the results are shown in Table 2.
Comparative example 5
Do not adding under the condition of water treatment agent, carrying out pipeline with tap water and carry corrosion evaluation test, the results are shown in Table 2.
Table 2 corrosion evaluation test-results
As can be seen from Table 2, the corrodibility of the former water of middle water (comparative example 1) is stronger.By adding zinc salt provided by the invention and containing phosphor corrosion inhibitor (embodiment 1-17), can significantly reducing its erosion rate to carbon steel, illustrate method provided by the invention can effectively alleviate in water to its transport pipe corrosion.Generally, the total phosphate concentration of middle water is no more than 3.0mg/L, and zinc salt concentration is very low.In comparative example 2 and 3 simulations, in water, the higher condition of total phosphate concentration is tested, and the condition that only adds zinc salt in comparative example 4 simulations in water is tested, though its erosion rate decreases compared with comparative example 1, also there is a big difference with effect of the present invention.Meanwhile, effect of the present invention is also better than the Corrosion results taking tap water as subjects in comparative example 5.In addition, the test-results of table 2 also shows, be added with zinc salt of the present invention and containing the middle water of phosphor corrosion inhibitor as a supplement water be back to after recirculating cooling water system, only need add again copolymer anti-scale disperser, can under corresponding pH value and cycles of concentration, keep lower erosion rate, meet the requirement of circulating cooling water treatment completely.The present invention takes full advantage of original phosphorus in middle water, thereby has reduced the add-on of water conditioner.
Claims (23)
1. in, water is back to a method for recirculated cooling water, carries out successively following steps: a), at the water outlet of middle water production equipment, add zinc salt in Xiang Zhongshui; B) in the middle of in water the concentration of original total phosphate with PO
4 3-while counting not enough 1mg/L, in Xiang Zhongshui, add containing phosphor corrosion inhibitor; C) by middle water after treatment as a supplement water add in recirculating cooling water system; D) in recirculated cooling water, add copolymer anti-scale disperser.
2. method according to claim 1, is characterized in that described zinc salt is selected from zinc sulfate and zinc chloride.
3. method according to claim 2, is characterized in that described zinc sulfate is preferably Zinc vitriol.
4. method according to claim 1, is characterized in that the concentration of zinc salt in middle water is with Zn
2+count 0.2～1.0mg/L.
5. according to the method described in claim 1-4 any one, it is characterized in that the described phosphor corrosion inhibitor that contains is selected from inorganic phosphorated inhibiter and organic containing phosphor corrosion inhibitor.
6. method according to claim 5, is characterized in that the described phosphor corrosion inhibitor that contains is selected from phosphoric acid salt, poly-phosphate and organic phospho acid.
7. method according to claim 6, it is characterized in that the described phosphor corrosion inhibitor that contains is selected from SODIUM PHOSPHATE, MONOBASIC, potassium primary phosphate, Sodium phosphate dibasic, dipotassium hydrogen phosphate, sodium phosphate, potassiumphosphate, Sodium hexametaphosphate 99, tripoly phosphate sodium STPP, hydroxy ethylene diphosphonic acid, 2-phosphono-containing butane-1,2,4-tricarboxylic acid, 2-hydroxyl phosphino-acetic acid, Amino Trimethylene Phosphonic Acid, ethylenediamine tetramethylene phosphonic acid and diethylenetriamine pentamethylenophosphonic acid(DTPP).
8. method according to claim 7, is characterized in that the described phosphor corrosion inhibitor that contains is selected from SODIUM PHOSPHATE, MONOBASIC, potassium primary phosphate, Sodium hexametaphosphate 99, hydroxy ethylene diphosphonic acid and 2-phosphono-containing butane-1,2,4-tricarboxylic acid.
9. according to the method described in claim 1-4 any one, it is characterized in that the concentration of total phosphate in middle water is with PO
4 3-count 1.0～3.0mg/L.
10. according to the method described in claim 1-4 any one, it is characterized in that described copolymer anti-scale disperser is selected from containing ester group and/or containing sulfonic group multipolymer.
11. methods according to claim 10, is characterized in that described copolymer anti-scale disperser is selected from acrylic acid/esters multipolymer, vinylformic acid/2 '-acrylamide-2-methyl propane sulfonic multipolymer, acrylic acid/esters/2 '-acrylamide-2-methyl propane sulfonic multipolymer, vinylformic acid/sodium allyl sulfonate multipolymer and toxilic acid/Styrene Sulfonic Acid Copolymer.
12. methods according to claim 11, is characterized in that described acrylate is selected from vinylformic acid C
1-8ester.
13. methods according to claim 12, is characterized in that described acrylate is selected from methyl acrylate, ethyl propenoate and Propylene glycol monoacrylate.
14. according to the method described in claim 1-4 any one, it is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
15. methods according to claim 5, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
16. methods according to claim 6, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
17. methods according to claim 7, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
18. methods according to claim 8, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
19. methods according to claim 9, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
20. methods according to claim 10, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
21. methods according to claim 11, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
22. methods according to claim 12, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
23. methods according to claim 13, is characterized in that effectively the add concentration of described copolymer anti-scale disperser in recirculated cooling water is 5～20mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110082715.2A CN102730845B (en) | 2011-04-02 | 2011-04-02 | Method for reusing recycled water in circulating cooling water |
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| CN104129878A (en) * | 2013-05-03 | 2014-11-05 | 栗田工业株式会社 | Water quality management method of circulating cooling water |
| CN103288225B (en) * | 2013-05-31 | 2014-12-10 | 武汉钢铁(集团)公司 | Circulating water antisludging agent and application thereof |
| CN104911616B (en) * | 2014-03-12 | 2017-08-25 | 江苏核电有限公司 | A kind of nuclear power station freezes water supply system corrective maintenance maintaining method |
| CN104193016B (en) * | 2014-08-26 | 2016-01-27 | 佛山高富中石油燃料沥青有限责任公司 | A kind of corrosion inhibiting and descaling agent and compound method thereof and using method |
| CN109133390B (en) * | 2017-06-19 | 2021-08-03 | 中国石油化工股份有限公司 | Method for treating circulating cooling water |
| CN108163919A (en) * | 2017-12-27 | 2018-06-15 | 郑州拓洋生物工程有限公司 | Deoxygenation corrosion inhibiter and its preparation method and application |
| CN110803781B (en) * | 2018-08-06 | 2021-07-30 | 中国石油化工股份有限公司 | Composite corrosion and scale inhibitor containing polyphosphate, application thereof and method for inhibiting corrosion of circulating cooling water containing sulfur |
| CN111876784B (en) * | 2020-07-31 | 2022-02-22 | 西安热工研究院有限公司 | Corrosion inhibitor applied to SCAL type indirect cooling system and dosing method thereof |
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| CN1491907A (en) * | 2002-10-23 | 2004-04-28 | 中国石油化工股份有限公司北京燕山分 | Composite scale resistant corrosion inhibitor and its use in reusing ammonia-nitrogen containing waste water in circulating cooling water |
| CN101423300A (en) * | 2008-11-14 | 2009-05-06 | 安徽省电力科学研究院 | Scale and corrosion inhibitor suitable for reclaimed water reuse system |
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| CN1491907A (en) * | 2002-10-23 | 2004-04-28 | 中国石油化工股份有限公司北京燕山分 | Composite scale resistant corrosion inhibitor and its use in reusing ammonia-nitrogen containing waste water in circulating cooling water |
| CN101423300A (en) * | 2008-11-14 | 2009-05-06 | 安徽省电力科学研究院 | Scale and corrosion inhibitor suitable for reclaimed water reuse system |
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