CN105084562A - Treatment method by taking seawater as coal gasification cooling water - Google Patents
Treatment method by taking seawater as coal gasification cooling water Download PDFInfo
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- CN105084562A CN105084562A CN201410194332.8A CN201410194332A CN105084562A CN 105084562 A CN105084562 A CN 105084562A CN 201410194332 A CN201410194332 A CN 201410194332A CN 105084562 A CN105084562 A CN 105084562A
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Abstract
The present invention relates to a treatment method by taking seawater as coal gasification cooling water. The treatment method comprises: seawater pretreatment and seawater circulation; when the seawater is circulated as circulating cooling water, adding 40-50 mg of a corrosion inhibitor, 30-40 mg of a scale inhibitor, 20-30 mg of oxidizing biocides, and 80-120 mg of non-oxidizing biocides in per liter of the seawater. According to the technical solution of water treatment provided by the present invention, the concentration factor can be controlled between 1.5-2.0. The corrosion rate of carbon-steel is less than 0.125 mm/a, the corrosion rate of copper, stainless steel is less than 0.009 mm/a, the biological slime is less than 4.0 mL/m3, a total number of heterotrophic bacterium is less than 5.0x105/mL, and the fouling thermal resistance is less than 3.44x10-4m3.k/w. The treatment method meets the provision of (People's Republic of China national standard industrial circulating cooling water treatment design specifications) GB50050-95, water saving reaches 97% with respect to once-through cooling.
Description
Technical field
The present invention relates to the treatment process of a kind of seawater as gasification water coolant, be used as the inhibiter of water coolant, Scale inhibitors, biocide and processing scheme thereof more specifically to seawater.
Background technology
At present, domestic and international coastland has had a lot of industrial enterprise to utilize seawater to replace fresh water as industrial colling, but the type of cooling is adopt direct cooling water supply mode always, and interchanger adopts titanium material, pipeline carries out inside lining anti-corrosive material, so not only construction investment is large, and a large amount of hot water of discharge cause thermal pollution to offshore sea waters.Therefore the water coolant of coastland large and medium-sized industrial enterprise adopts seawater to make make up water, the recirculating cooling water system of select tape cooling tower, not only avoids and discharges hot water in a large number to ocean, also considerably reduces the quantity from ocean water intaking.
Because the salinity of seawater is high, containing high rigidity, high chloride ion, high sulfate ion and high dissolved solids, to equipment, there is stronger corrosion and scaling, recirculated cooling water in operational process on heat-transfer surface and water-transmission line have heavy corrosion, fouling; Multiple-microorganism, shellfish, hydroids etc. are contained in seawater, when recirculated water runs and breeds serious, its problem such as dirt dirt and the easy occluding device of shellfish itself; Offshore area water suspension is higher in addition, can promote microbial growth and form foundry loam, is easily attached to cooling apparatus inwall, water-transmission line in recirculating cooling water system, easily blocks time serious.
For solving these problems that circulating cooling seawater brings, be necessary with machinery, the method for chemistry to carry out pre-treatment and avoids adult shellfish and hydroids etc. to enter system, reduces on the basis of suspended substance to seawater, add acid treatment in conjunction with circulating water system and alleviate scaling tendency, carry out scale inhibitor simultaneously, bacterium algae kills livestock and the work for the treatment of such as sludge stripping.
Summary of the invention
The invention solves the problem such as corrosion and scaling and microorganism of the material such as admiraltymetal, carbon steel, provide a whole set of chemical processing schemes, achieve the recycle of seawater.Technical scheme of the present invention is as follows.
To the recirculating cooling water system be made up of the material such as carbon steel pipe, admiraltymetal, adopt 40 ~ 50mg/L inhibiter, 30 ~ 40mg/L Scale inhibitors, 20 ~ 30mg/L oxidizing biocides, 80 ~ 120mg/L non oxidizing bactericide etc. processes, and cycles of concentration controls between 1.5-2.0.The corrosion rate of carbon steel is less than 0.125mm/a, and copper, stainless corrosion rate are less than 0.009mm/a, and biological clay is less than 4.0mL/m
3, total heterotrophic bacteria count is less than 5.0 × 10
5individual/mL, fouling resistance is less than 3.44 × 10
-4m
3.k/w.
Described inhibiter contains Sodium orthomolybdate 10 ~ 20%, Sunmorl N 60S 8 ~ 15%, Sodium Benzoate 5 ~ 10%, zinc sulfate 10 ~ 20%, zinc chloride 5 ~ 10%, trisodium citrate 8 ~ 15%, thionamic acid 2 ~ 6%, Sodium hexametaphosphate 99 4 ~ 8%, sodium sulfate 5 ~ 10%, the phenylpropyl alcohol triazole 4 ~ 10% of weight percent.
Described Scale inhibitors contains the N-phosphonate group N-sulfonic group N of weight percent
,-dicarboxyl-quadrol 6 ~ 10%, phosphine carboxylic acid 10 ~ 20%, phosphoric acid 5 ~ 10%, AA/HPA/AMPS/IPPA20 ~ 40%.
Described oxidizing biocides is at least containing any one composition in Babysafe, strong chlorine oil, active bromine or bromochlorohydantoin four kinds of materials.(Babysafe, strong chlorine oil, active bromine or bromochlorohydantoin)
Described non oxidizing bactericide is 1227, isothiazolinone, organic amine or bi-quaternary ammonium salt.
The invention has the beneficial effects as follows:
Water technology scheme of the present invention can control cycles of concentration between 1.5-2.0.The corrosion rate of carbon steel is less than 0.125mm/a, and copper, stainless corrosion rate are less than 0.009mm/a, and biological clay is less than 4.0mL/m
3, total heterotrophic bacteria count is less than 5.0 × 10
5individual/mL, fouling resistance is less than 3.44 × 10
-4m
3.k/w.Meet the regulation of " National Standard of the People's Republic of China's Code for design of industrial recirculating cooling water treatment " GB50050-95, relative to direct cooling, water saving reaches 97%.
Embodiment
Specific embodiment is:
1, system operational parameters
| Operating parameter | Unit | Numerical value |
| Quantity of circulating water Qr | t/h | 15000 |
| Possess water yield V | m 3 | 3500 |
| Evaporated water Qe | t/h | 200 |
| Water amount of blowdown Qb | t/h | 250~500 |
| Amount of makeup water Qm | t/h | 450~750 |
| Cycles of concentration K | 1.4~2.0 |
2, make up water (seawater) water quality
| Analysis project | Unit | Supplement seawater | Circulating seawer (K=2.0) |
| pH | 8.11 | 8.5(estimated value) | |
| Specific conductivity | us/cm | 7500 | 15000 |
| Suspended substance | mg/L | 25.50 | 51.0 |
| Calcium ion | `` | 428.20 | 856.4 |
| Magnesium ion | `` | 1321.80 | 2643.6 |
| Total hardness 1/2 (Ca 2++Mg 2+) | mmol/L | 130.14 | 260.28 |
| Total alkalinity is (with CaCO 3Meter) | mmol/L | 2.25 | 4.5 |
| Chlorion | mg/L | 20081.6 | 40163.2 |
| Sulfate radical | `` | 3707.50 | 7415.0 |
| Iron ion | `` | 0.38 | 0.76 |
| Dissolved solids | `` | 35980 | 71960 |
3, the adding of medicament
Seawater Scale inhibitors, working concentration 30 ~ 40mg/L, adds according to water amount of blowdown;
Corrosion inhibitor of sea water, working concentration 40 ~ 50mg/L, adds according to water amount of blowdown;
Oxidizing bactericide, impact adds, working concentration 20 ~ 30mg/L, adds according to possessing the water yield;
Non oxidizing bactericide, for impact adds, every 10 ~ 15 days are once, and working concentration 80 ~ 120mg/L adds according to possessing the water yield;
4, on-the-spot water quality analysis
| Time, (hour) | pH | DD，μs/cm | Cl -，mg/L | PO 4 3-，mg/L | K | Cu 2+，mg/L |
| 6.21 16：00 | 8.13 | 137000 | 25600 | |||
| 6.21 19：00 | 7.1 | 115000 | 23100 | |||
| 6.22 8：00 | 7.82 | 135000 | 25100 | 2.0 | 1.29 | |
| 6.22 14：00 | 8.2 | 125000 | 27200 | 1.4 | ||
| 6.24 8：00 | 8.20 | 135000 | 24300 | 1.2 | ||
| 6.24 14：00 | 8.19 | 150000 | 27500 | 1.36 | ||
| 6.25 8：00 | 8.21 | 150000 | 7259.16 | |||
| 6.25 19：00 | 8.15 | 175000 | 30000 | .0.77 | 6371.3 | |
| 6.26 8：00 | 8.26 | 140000 | 27500 | 6894.2 | ||
| 6.26 19：00 | 8.15 | 175000 | 31700 | |||
| 6.27 8：00 | 8.16 | 135000 | 32000 | 1.64 | 2868.9 | |
| 6.27 11：30 | 8.16 | 260000 | 32700 | 1.56 | 3629.4 | |
| 6.27 15：00 | 8.10 | 145000 | 34300 | 1.74 | ||
| 6.28 8：00 | 8.13 | 200000 | 29200 | 2.1 | 1.44 | 1054 |
| 6.28 14：00 | 8.0 | 250000 | 34300 | 5.8 | 1.92 | 590 |
| 6.29 8：00 | 8.07 | 175000 | 26400 | 2.72 | 1.70 | 717.30 |
| 6.29 14：00 | 8.04 | 205000 | 30400 | 2.88 | 1.584 | 928.26 |
| 6.30 8：00 | 8.09 | 185000 | 30600 | 3.1 | 1.6 | 379 |
| 6.30 14：00 | 8.08 | 200000 | 33000 | 1.6 | ||
| 7.1 8：00 | 8.5 | 215000 | 34400 | 4.38 | 1.67 | 210.97 |
| 7.1 14：00 | 230000 | 34400 | 4.8 | 1.75 | 202.4 | |
| 7.2 8：00 | 7.95 | 175000 | 30000 | 2.91 | 1.52 | 222.7 |
| 7.2 14：00 | 7.97 | 180000 | 31700 | 3.68 | 1.58 | 244 |
| 7.3 8：00 | 7.92 | 165000 | 31000 | 3.92 | 1.58 | 216 |
| 7.3 14：00 | 7.96 | 195000 | 32800 | 4.2 | 256 | |
| 7.4 8：00 | 8.0 | 150000 | 26200 | 5.0 | 1.3 | |
| 7.5 8：00 | 8.0 | 170000 | 30800 | 4.99 | 1.52 | 217.5 |
| 7.5 14：00 | 7.96 | 180000 | 34100 | 5.66 | 1.67 | 162.8 |
| 7.6 8：00 | 8.0 | 200000 | 37200 | 6.17 | 1.82 | 156.5 |
| 7.7 8：00 | 7.74 | 170000 | 36700 | 3.78 | 1.48 | 62.5 |
5, running condition
System visible part (cooling tower filler, tower wall etc.) is without dirt and green alga; Run two weeks and carry out condenser and open twice, without fouling and dirt phenomenon.
In make up water and recirculated water, be linked into copper and carbon steel standard test piece respectively at run duration, the erosion rate of carbon steel test piece is all less than 0.125mm/a.The erosion rate 0.005mm/a of brass test piece, by contrast, the test piece seriously corroded in make up water, the test piece in recirculated water is then without obvious corrosion phenomenon.
Claims (9)
1. a seawater is as the treatment process of gasification water coolant, comprise sea water preprocessing and seawater circulation, it is characterized in that seawater adds inhibiter 40 ~ 50mg, Scale inhibitors 30 ~ 40mg, oxidizing biocides 20 ~ 30mg, non-oxidative bactericide 80 ~ 120mg often rising in seawater as recirculated cooling water circulation time.
2. a kind of seawater according to claim 1 is as the treatment process of gasification water coolant, it is characterized in that described inhibiter contains molybdate 10 ~ 20%, gluconate 12 ~ 20%, benzoate 5 ~ 10%, zinc sulfate 10 ~ 20%, zinc chloride 5 ~ 10%, trisodium citrate 8 ~ 15%, thionamic acid 4 ~ 8%, Sodium hexametaphosphate 99 4 ~ 8%, sodium sulfate 5 ~ 10%, the phenylpropyl alcohol triazole 4 ~ 10% of weight percent.
3. a kind of seawater according to claim 1 is as the treatment process of gasification water coolant, it is characterized in that described Scale inhibitors contains the N-phosphonate group N-sulfonic group N of weight percent
,-dicarboxyl-quadrol 6 ~ 10%, phosphine carboxylic acid 10 ~ 20%, phosphoric acid 5 ~ 10%, acetic acid/2-acrylamide-2-methylpro panesulfonic acid/2-hydroxyl-2-phosphine acyl acetic acid/phosphonic acids tetrapolymer 20 ~ 40%, surplus are water.
4. a kind of seawater according to claim 1 is as the treatment process of gasification water coolant, it is characterized in that described oxidizing biocides is one in Babysafe, strong chlorine oil, active bromine, bromochlorohydantoin four kinds of materials or its combination.
5. a kind of seawater according to claim 1 is as the treatment process of gasification water coolant, it is characterized in that described non-oxidative bactericide is 1227, one in isothiazolinone, organic amine, bi-quaternary ammonium salt four kinds of materials or its combination.
6. a kind of seawater according to claim 2 is as the treatment process of gasification water coolant, it is characterized in that described molybdate is Sodium orthomolybdate.
7. a kind of seawater according to claim 2 is as the treatment process of gasification water coolant, it is characterized in that described gluconate is Sunmorl N 60S.
8. a kind of seawater according to claim 2 is as the treatment process of gasification water coolant, it is characterized in that described benzoate is Sodium Benzoate.
9. a kind of seawater according to claim 3 is as the treatment process of gasification water coolant, it is characterized in that described phosphine carboxylic acid is 2-phosphonic acid butane, 1,2,4-tricarboxylic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410194332.8A CN105084562A (en) | 2014-05-09 | 2014-05-09 | Treatment method by taking seawater as coal gasification cooling water |
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|---|---|---|---|
| CN201410194332.8A CN105084562A (en) | 2014-05-09 | 2014-05-09 | Treatment method by taking seawater as coal gasification cooling water |
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|---|---|
| CN105084562A true CN105084562A (en) | 2015-11-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645611A (en) * | 2016-02-03 | 2016-06-08 | 青岛科润生物科技有限公司 | Multifunctional industrial water disposal agent and preparing method thereof |
-
2014
- 2014-05-09 CN CN201410194332.8A patent/CN105084562A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105645611A (en) * | 2016-02-03 | 2016-06-08 | 青岛科润生物科技有限公司 | Multifunctional industrial water disposal agent and preparing method thereof |
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