CN103964643A - Method for deeply treating reclaimed water for supplementary water of circulating cooling water for heat-engine plants - Google Patents
Method for deeply treating reclaimed water for supplementary water of circulating cooling water for heat-engine plants Download PDFInfo
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Abstract
The invention relates to a reclaimed water treatment method, and particularly relates to a method for deeply treating reclaimed water for supplementary water of circulating cooling water for heat-engine plants. The method comprises the following steps: aerating reclaimed water: firstly adding slaked lime, adding coagulant polymeric ferric sulfate, and adding high-efficiency coagulant aid, precipitating, and extracting upper clear liquid; sterilizing with sterilizing agent, adding sulfuric acid to regulate pH to 7.5-8.0; and adding composite scale and corrosion inhibitor. By virtue of the deep treatment method, the related technical problems of deep treatment, sterilization, scale removing, corrosion resistance, ammonia-nitrogen treatment and the like of reclaimed water in power plants can be solved, technical support is provided to safety and economic application of reclaimed water in power plants, the reclaimed water is recycled as supplementary water of circulating water in power plants, and has remarkably economical, social and environment benefits.
Description
Technical field
The present invention relates to a kind for the treatment of process of reuse water, particularly a kind of reuse water deep treatment method for power plant circulating cooling water make up water.
Background technology
Recirculated cooling water accounts for more than 70% in thermal power plant's total water, and China is the country of a shortage of water resources, and water source supply has become one of bottleneck factor of restriction Thermal Power Plant Construction and production.Reuse water is the water that municipal effluent and trade effluent can be back to specific end use after certain processing, compare with the water such as sea water desaltination, interbasin water transfer scheme, reuse water has obvious advantage: the cost of reuse water is about 1 ~ 3 yuan/ton, and the cost of sea water desaltination is about 5 ~ 7 yuan/ton, the cost of interbasin water transfer is about 5 ~ 20 yuan/ton.Meanwhile, reuse of wastewater contributes to improve the ecological environment, and realizes the benign cycle of Ecology.Therefore, reuse water becomes long-term, stable, the sufficient second water source of circulating cooling water of power plant.Alleviating power plant water source imbalance between supply and demand, alleviating pollution, reducing city to aspects such as the blowdown flow rates of environment, be with a wide range of applications.But reuse water source comprises sanitary sewage, various waste water, therefore saltiness is high, organic content is high, ammonia-nitrogen content is high, bacterial population complexity, corrosion and fouling tendency to metal pipe material are large, very easily cause fouling, corrosion and the microorganism growth of the parts such as interchanger.
Circulating cooling water quality after processing must meet following condition: (1) avoids fouling of heat-transfer surface; (2) avoid causing the corrosion of heat-transfer surface big area, will note preventing especially tubercular corrosion; (3) avoid microorganism accumulation, bacterium and algal grown in the recycle system; (4) circular water treating system should be simple as far as possible; (5) circular water treating system working cost is low; (6) circular water treating system is reliable, and stable effluent quality meets the requirement of equipment specifications.
In order to reach above-mentioned requirements, reuse water must carry out advanced treatment, just can reach the requirement of power plant circulating cooling water make up water water.
Summary of the invention
The present invention is in order to overcome the deficiency of above technology, a kind of reuse water deep treatment method for power plant circulating cooling water make up water is provided, and this supplementary water is without fouling, corrosion-free phenomenon, and processing suburb fruit is good, technique is simple, has significant economy, society and environmental benefit.
Reuse water deep treatment method for power plant circulating cooling water make up water of the present invention, adopts following steps:
(1) reuse water is introduced in BAF and is carried out entering settling tank after Air Exposure, and precipitate and separate is got supernatant liquor;
(2) supernatant liquor of step (1) first adds slaked lime, after stirring, then adds coagulant polymeric ferric sulfate, after stirring, finally adds high-efficient coagulant aide, then stirs, and settling pond sedimentation, extracts supernatant liquid; The add-on of slaked lime is 230～460mg/L, and the add-on of bodied ferric sulfate is 6mg/L～15mg/L, and described high-efficient coagulant aide is Thallus Laminariae (Thallus Eckloniae) extract-sodium alginate gel solution, and the add-on of high-efficient coagulant aide is counted 10mg/L～15mg/L with sodium alginate; Described sodium alginate gel solution; to adopt following methods to make: dry 1Kg sea-tangle is fully soaked; after removing silt, be cut into the segment about 5cm; under 1.0MPa pressure, maintain 10 minutes and carry out steam explosion processing, sea-tangle after treatment adds 10L 2% (weight) sodium carbonate solution again, maintains 45 DEG C of digestion 1 hour; add 10Kg water; after stirring, separate, discard residue, get thickness supernatant liquor and be sodium alginate gel solution;
(3) clear liquor of step (2) adds sterilant to carry out after sterilization, adds sulfuric acid to adjust pH to 7.5～8.0;
(4) water of step (3) adds composite scale-inhibiting corrosion inhibitor by the amount of 8mg/L, after mixing, adds circulating cooling water of power plant; Described composite scale-inhibiting corrosion inhibitor is to be that weight proportion is Sodium orthomolybdate, Zinc Sulphate Heptahydrate, Trisodium Citrate, trolamine, benzotriazole, poly aspartic acid, poly-epoxy succinic acid, the vinylformic acid-acrylate-sulfonate terpolymer of 3:1.5:2:3:1:10:7:12.
because recirculated cooling water operating temperature is at 40～70 DEG C, the open operation of whole circulating water system, is rich in oxygen, is applicable to very much bacterium algae microbial reproduction.Therefore stricter to the requirement of the nutritive elements such as ammonia nitrogen, COD, phosphorus in moisturizing, nutritive element too much will cause growing of bacterium, produces foundry loam etching problem, especially when ammonia-nitrogen content is high, the breeding of nitrifier will consume basicity, causes pH value to decline, the safe operation of serious harm circulating water system.Therefore, treatment process of the present invention, first adopts bio-aeration processing, after removal of ammonia and nitrogen for recirculated cooling water make up water.
Reuse water after Air Exposure, adds respectively slaked lime, coagulating agent and high-efficient coagulant aide, carries out precipitation process.First add slaked lime to soften processing, remove most of carbonate hardness.Next adds coagulating agent (bodied ferric sulfate) to carry out coagulating treatment, makes the molecules such as Calcium Carbonate Particles that original suspended substance in water, colloid and softening process form form the alumen ustum precipitation of large-size.Finally add high-efficient coagulant aide, further promote flco grow up and precipitate, reduce regeneration water hardness and turbidity.The small throw out forming in During Coagulation Process, through adsorption and the bridging action of sodium alginate gel long chain molecule, the particle that bonding formation is larger, directly separates with water fast with natural sedimentation, and the clear water on upper strata directly utilizes.The high-efficient coagulant aide that the present invention adopts is Thallus Laminariae (Thallus Eckloniae) extract-sodium alginate gel solution, its outward appearance is micro-yellow thick liquid, nonpoisonous and tasteless, be not subject to the restriction of pH value, and can be extensively with Polyferric Sulfate, gather the multiple flocculation agents such as aluminium, Tai-Ace S 150 and be used in conjunction with, effect is all good, is a kind of desirable environment-friendly type water treatment coagulant aid.
Reuse water of the present invention adds after composite scale-inhibiting corrosion inhibitor, just can be directly used in circulating cooling water of power plant make up water.The composite scale-inhibiting corrosion inhibitor that the present invention adopts, nontoxic, not phosphorous, without environmental influence.Composite finished product is dark brown slightly thick liquid, density 1.25g/mL, solid content approximately 30% can move for a long time under high temperature (75 DEG C), high pH valve system, the tubing materials such as carbon steel to circulating water system, stainless steel, copper all have good antiseptic property, and scale inhibition performance is greater than 91.3%.
The reuse water deep treatment method of the invention described above, in order further to improve sterilization effect, described sterilant is the compound disinfectant of dioxide peroxide and isothiazolinone composition, dioxide peroxide is conventional continuous adding sterilant, consumption (taking available chlorine) is 6～9 mg/L, isothiazolinone biocide agent is impingement sterilant, and regularly high dosage adds, and consumption is 150～200 mg/L.
By deep treatment method of the present invention, solve reuse water correlation technique difficult problem such as related advanced treatment, sterilization, scale inhibition, anticorrosion, ammonia nitrogen processing in power plant's reuse, for reuse water provides technical support in the safety of power plant and economic use, reuse water is in power plant as circulating water system reuse, and its economy, society and Environmental Effect Yidu are very remarkable.
Embodiment
The supporting reuse water advanced treatment engineering of 2 × 600MW enlarging unit, carries out concrete experiment.The secondary discharge water of municipal sewage plant is taken from regeneration water source.
one: the raw material that the present invention adopts:
Slaked lime: pressed powder, purity >=94%, fineness: 325 orders;
Coagulating agent: bodied ferric sulfate (PFS): liquid state, all iron content>=10%, density:>=1.45g/cm
3;
High-efficient coagulant aide: be sodium alginate gel solution, to adopt following methods to make: dry 1Kg sea-tangle is fully soaked, after removing silt, be cut into the segment about 5cm, under 1.0MPa pressure, maintain 10 minutes and carry out steam explosion processing, dry sea-tangle after treatment adds 10L 2% (weight) sodium carbonate solution again, maintains 45 DEG C of digestion 1 hour, add 10Kg water, after stirring, separate, discard residue, get thickness supernatant liquor and be sodium alginate gel solution.
Water sample is the secondary discharge water outlet of In Urban Water Quality purifying plant while normally moving, and main water-quality guideline is as table 1,13.1～26.3 DEG C of test water temperatures.
Table 1 is tested the main water-quality guideline of water sample
| pH | 7.20 | Total P mg/L | 1.67 |
| Turbidity (NTU) | 5.33 | Fully hard degree mmol/L | 8.99 |
| Suspended substance mg/L | 14.6 | The hard mmol/L of Ca | 6.45 |
| BOD 5 mg/L | 13.9 | Temporary hardness mmol/L | 6.5 |
| CODcr mg/L | 33.6 | Full basicity mmol/L | 6.5 |
| Free CO 2 mg/L | 19.8 | Phenolphthalein alkalinity mmol/L | 0 |
| Ammonia nitrogen mg/L | 42.0 | Methyl orange alkalinity mmol/L | 6.5 |
Two: treatment process:
Adopt following steps to carry out advanced treatment above-mentioned reuse water:
Reuse water is introduced in regeneration pond, adopts BAF treatment process to carry out Air Exposure, filters; Filtrate first adds slaked lime, after stirring, then adds coagulant polymeric ferric sulfate, after stirring, finally adds high-efficient coagulant aide, then stirs, and natural subsidence, extracts supernatant liquid; The add-on of slaked lime is 400mg/L, and the add-on of bodied ferric sulfate is 10mg/L, and the add-on of high-efficient coagulant aide is counted 15mg/L with sodium alginate; Described high-efficient coagulant aide is Thallus Laminariae (Thallus Eckloniae) extract sodium alginate gel solution.
Above-mentioned clear liquor adds after sterilant sterilization, adds sulfuric acid to adjust pH to 8.7; Described sterilant is the compound disinfectant of oxidation series bactericidal agent and non-oxide series bactericidal agent composition, the sterilization of oxidation class is dioxide peroxide, addition (taking available chlorine) is 5 mg/L, and non-oxide class sterilization is isothiazolinone biocide agent, and consumption is 180 mg/L.
Reuse water water-quality guideline after table 2 germicidal treatment
| Project | After processing |
| Full basicity, mmol/L | ～1.3 |
| Total hardness, mmol/L | ～1.5 |
| Calcium hardness, mmol/L | ～1.1 |
| Magnesium hardness, mmol/L | ～0.4 |
| Turbidity, NTU | ＜0.5 |
| Total phosphorus, mg/L | ～0 |
| COD Cr，mg/L | ～8.7 |
| BOD 5，mg/L | ～2 |
| NH 3-N，mg/L | 0 |
| Fe mg/L | ＜0.1 |
| Mn mg/L | ＜0.001 |
| Free chlorine residual mg/L | ---- |
| Total plate count, individual/mL | <50 |
Above-mentioned reuse water after treatment adds composite scale-inhibiting corrosion inhibitor by the amount of 10mg/L, after mixing, is added to power plant's cycling use of water; Described composite scale-inhibiting corrosion inhibitor is that weight proportion is Sodium orthomolybdate, Zinc Sulphate Heptahydrate, Trisodium Citrate, trolamine, benzotriazole, poly aspartic acid, poly-epoxy succinic acid, the vinylformic acid-acrylate-sulfonate terpolymer of 3:1.5:2:3:1:10:7:12.
The recirculated cooling water of the invention described above, 40～60 DEG C of temperature of control, pH value 8.7, concentration rate are 4.0, the normal loss water yields such as simultaneously replenishment system evaporation, wind, seepage and blowdown, maintain under the operational conditions of water balance, move 306 days, open condenser, interchanger copper pipe, condenser water box, tube sheet and circulating water pipeline are without fouling, corrosion-free phenomenon.Circulating cooling water tower is inner and the substantially aseptic algae moss of circulating water pool adheres to, the glutinous mud of nothing accumulates, and meets operating requirement.
Claims (1)
1. for a reuse water deep treatment method for power plant circulating cooling water make up water, adopt following steps:
(1) reuse water is introduced in BAF and is carried out entering settling tank after Air Exposure, and precipitate and separate is got supernatant liquor;
(2) supernatant liquor of step (1) first adds slaked lime, after stirring, then adds coagulant polymeric ferric sulfate, after stirring, finally adds high-efficient coagulant aide, then stirs, and settling pond sedimentation, extracts supernatant liquid; The add-on of slaked lime is 230～460mg/L, and the add-on of bodied ferric sulfate is 6mg/L～15mg/L, and described high-efficient coagulant aide is Thallus Laminariae (Thallus Eckloniae) extract-sodium alginate gel solution, and the add-on of high-efficient coagulant aide is counted 10mg/L～15mg/L with sodium alginate; Described sodium alginate gel solution; to adopt following methods to make: dry 1Kg sea-tangle is fully soaked; after removing silt, be cut into the segment about 5cm; under 1.0MPa pressure, maintain 10 minutes and carry out steam explosion processing, sea-tangle after treatment adds 10L 2% (weight) sodium carbonate solution again, maintains 45 DEG C of digestion 1 hour; add 10Kg water; after stirring, separate, discard residue, get thickness supernatant liquor and be sodium alginate gel solution;
(3) clear liquor of step (2) adds sterilant to carry out after sterilization, adds sulfuric acid to adjust pH to 7.5～8.0;
(4) water of step (3) adds composite scale-inhibiting corrosion inhibitor by the amount of 8mg/L, after mixing, adds circulating cooling water of power plant; Described composite scale-inhibiting corrosion inhibitor is to be that weight proportion is Sodium orthomolybdate, Zinc Sulphate Heptahydrate, Trisodium Citrate, trolamine, benzotriazole, poly aspartic acid, poly-epoxy succinic acid, the vinylformic acid-acrylate-sulfonate terpolymer of 3:1.5:2:3:1:10:7:12.
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Cited By (7)
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| CN104193068A (en) * | 2014-09-19 | 2014-12-10 | 王惠生 | Comprehensive utilization method and device of waste water from refuse burning |
| CN104263685A (en) * | 2014-09-28 | 2015-01-07 | 刘晓风 | Microbiological treatment fungicide for circulating cooling water as well as preparation method and application of microbiological treatment fungicide |
| CN104355418A (en) * | 2014-10-24 | 2015-02-18 | 中国海洋石油总公司 | Preparation method of non-phosphorus corrosion and scale inhibitor |
| CN107935303A (en) * | 2017-11-24 | 2018-04-20 | 华南理工大学 | A kind of technique of municipal administration secondary effluent reuse boiler of power plant water |
| CN107986410A (en) * | 2017-12-08 | 2018-05-04 | 西安科技大学 | A kind of method of power plant's treating nature water |
| CN108117169A (en) * | 2017-12-05 | 2018-06-05 | 山东钢铁股份有限公司 | A kind of recirculated water corrosion inhibiting and descaling agent |
| CN108751445A (en) * | 2018-06-01 | 2018-11-06 | 武汉钢铁有限公司 | The method and its application of circular cooling water quality stabilizer are prepared using zinc-containing water |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193068A (en) * | 2014-09-19 | 2014-12-10 | 王惠生 | Comprehensive utilization method and device of waste water from refuse burning |
| CN104263685A (en) * | 2014-09-28 | 2015-01-07 | 刘晓风 | Microbiological treatment fungicide for circulating cooling water as well as preparation method and application of microbiological treatment fungicide |
| CN104355418A (en) * | 2014-10-24 | 2015-02-18 | 中国海洋石油总公司 | Preparation method of non-phosphorus corrosion and scale inhibitor |
| CN107935303A (en) * | 2017-11-24 | 2018-04-20 | 华南理工大学 | A kind of technique of municipal administration secondary effluent reuse boiler of power plant water |
| CN107935303B (en) * | 2017-11-24 | 2020-12-08 | 华南理工大学 | Process for recycling power plant boiler water from municipal secondary effluent |
| CN108117169A (en) * | 2017-12-05 | 2018-06-05 | 山东钢铁股份有限公司 | A kind of recirculated water corrosion inhibiting and descaling agent |
| CN107986410A (en) * | 2017-12-08 | 2018-05-04 | 西安科技大学 | A kind of method of power plant's treating nature water |
| CN108751445A (en) * | 2018-06-01 | 2018-11-06 | 武汉钢铁有限公司 | The method and its application of circular cooling water quality stabilizer are prepared using zinc-containing water |
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