JP2000070993A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2000070993A5 JP2000070993A5 JP1998241581A JP24158198A JP2000070993A5 JP 2000070993 A5 JP2000070993 A5 JP 2000070993A5 JP 1998241581 A JP1998241581 A JP 1998241581A JP 24158198 A JP24158198 A JP 24158198A JP 2000070993 A5 JP2000070993 A5 JP 2000070993A5
- Authority
- JP
- Japan
- Prior art keywords
- water
- days
- scale
- liter
- filtrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 12
- 229960005069 Calcium Drugs 0.000 description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 9
- 239000011575 calcium Substances 0.000 description 9
- 229910052791 calcium Inorganic materials 0.000 description 9
- 239000000706 filtrate Substances 0.000 description 7
- 229960003563 Calcium Carbonate Drugs 0.000 description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M NaHCO3 Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H Sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001444 polymaleic acid Polymers 0.000 description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 2
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L cacl2 Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
Description
【０００９】
【実施例】
以下に、実施例を挙げて本発明をさらに詳細に説明するが、本発明はこれらの実施例によりなんら限定されるものではない。
実施例及び比較例において、スケール付着試験は、伝熱面積が０.２５ｍ2の熱交換器を有し、保有水量が０.４５ｍ3である開放循環モデル冷却水系を用いて行った。熱交換器は、材質がＳＵＳ３０４で、外径が１９ｍｍのチューブを備えている。このモデル冷却水系に、厚木市水に純水と塩類を加えて調製した水を循環水及び補給水として加え、濃縮倍数が６倍又は１０倍になるように、水中のカリウム濃度でコントロールしながら３０日間運転した。この間、循環水の熱交換器入口温度は４５℃、出口温度は７５℃に保った。また、循環水の熱交換器チューブを通過する流速は０.５ｍ／ｓとした。
実施例１
厚木市水に１０重量％塩化カルシウム水溶液と５重量％炭酸水素ナトリウム水溶液を添加して、ｐＨ７.４、カルシウム硬度５０ｍｇＣａＣＯ3／リットル、Ｍアルカリ度５０ｍｇＣａＣＯ3／リットルの水質を有する補給水を調製し、濃縮倍数６倍の運転を行った。さらに、運転中は、粒径０.１〜１.０μｍの重質炭酸カルシウムの５０重量％水分散液を、重質炭酸カルシウムの濃度が２０ｍｇ／リットルになるように循環水に添加した。理論水質は、ｐＨ８.９、カルシウム硬度３００ｍｇＣａＣＯ3／リットル、Ｍアルカリ度３００ｍｇＣａＣＯ3／リットルである。
３０日間運転を継続したのち、循環水を孔径０.１μｍのフィルターを用いてろ過し、ろ液のカルシウム硬度を測定したところ、１３９ｍｇＣａＣＯ3／リットルであった。また、熱交換器チューブに付着したスケールを採取し、１０５℃で乾燥したのち秤量して、スケールの付着速度を求めたところ、８ｍｇ／ｃｍ2／３０日であった。
実施例２
粒径０.１〜１.０μｍの重質炭酸カルシウムの５０重量％水分散液の代わりに、粒径１.０〜５.０μｍの軽質炭酸カルシウムの５０重量％水分散液を用いた以外は、実施例１と同様にして３０日間の運転を行い、ろ液のカルシウム硬度とスケールの付着速度を求めた。
ろ液のカルシウム硬度は１４１ｍｇＣａＣＯ3／リットルであり、スケールの付着速度は７ｍｇ／ｃｍ2／３０日であった。
比較例１
粒径０.１〜１.０μｍの重質炭酸カルシウムの５０重量％水分散液の代わりに、ヘキサメタリン酸ソーダの２０重量％水溶液を、ヘキサメタリン酸ソーダの濃度が２０ｍｇ／リットルになるように循環水に添加した以外は、実施例１と同様にして３０日間の運転を行い、ろ液のカルシウム硬度とスケールの付着速度を求めた。
ろ液のカルシウム硬度は２９０ｍｇＣａＣＯ3／リットルであり、スケールの付着速度は３５ｍｇ／ｃｍ2／３０日であった。
比較例２
粒径０.１〜１.０μｍの重質炭酸カルシウムの５０重量％水分散液の代わりに、分子量３,５００のポリマレイン酸の２０重量％水溶液を、ポリマレイン酸の濃度が２０ｍｇ／リットルになるように循環水に添加した以外は、実施例１と同様にして３０日間の運転を行い、ろ液のカルシウム硬度とスケールの付着速度を求めた。
ろ液のカルシウム硬度は２８０ｍｇＣａＣＯ3／リットルであり、スケールの付着速度は３２ｍｇ／ｃｍ2／３０日であった。
実施例１〜２及び比較例１〜２の結果を、第１表に示す。
0009
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
In Examples and Comparative Examples, the scale adhesion test was carried out using an open circulation model cooling water system having a heat exchanger with a heat transfer area of 0.25 m 2 and a holding water amount of 0.45 m 3. The heat exchanger is made of SUS304 and has a tube having an outer diameter of 19 mm. To this model cooling water system, water prepared by adding pure water and salts to Atsugi city water is added as circulating water and make-up water, and while controlling the potassium concentration in the water so that the concentration factor becomes 6 times or 10 times. I drove for 30 days. During this period, the heat exchanger inlet temperature of the circulating water was maintained at 45 ° C., and the outlet temperature was maintained at 75 ° C. The flow velocity of the circulating water passing through the heat exchanger tube was set to 0.5 m / s.
Example 1
A 10 wt% calcium chloride aqueous solution and a 5 wt% sodium hydrogen carbonate aqueous solution are added to Atsugi City water to prepare make-up water having a pH of 7.4, a calcium hardness of 50 mgCaCO 3 / liter, and an M alkalinity of 50 mgCaCO 3 / liter. , The operation was carried out at a concentration factor of 6 times. Further, during operation, a 50% by weight aqueous dispersion of heavy calcium carbonate having a particle size of 0.1 to 1.0 μm was added to circulating water so that the concentration of heavy calcium carbonate was 20 mg / liter. The theoretical water quality is pH 8.9, calcium hardness 300 mg CaCO 3 / liter, and M alkalinity 300 mg CaCO 3 / liter.
After continuing the operation for 30 days, the circulating water was filtered using a filter having a pore size of 0.1 μm, and the calcium hardness of the filtrate was measured and found to be 139 mgCaCO 3 / liter. Also, the scale deposited on the heat exchanger tubes were taken, and weighed after drying at 105 ° C., was determined a deposition rate of the scale was 8mg / cm 2/30 days.
Example 2
Except that a 50% by weight aqueous dispersion of light calcium carbonate having a particle size of 1.0 to 5.0 μm was used instead of the 50% by weight aqueous dispersion of heavy calcium carbonate having a particle size of 0.1 to 1.0 μm. The operation was carried out for 30 days in the same manner as in Example 1, and the calcium hardness of the filtrate and the adhesion rate of scale were determined.
Calcium hardness of the filtrate is 141mgCaCO 3 / l, the deposition rate of the scale was 7mg / cm 2/30 days.
Comparative Example 1
Instead of a 50% by weight aqueous dispersion of heavy calcium carbonate having a particle size of 0.1 to 1.0 μm, a 20% by weight aqueous solution of sodium hexametaphosphate is circulated so that the concentration of sodium hexametaphosphate is 20 mg / liter. The operation was carried out for 30 days in the same manner as in Example 1 except that the mixture was added to, and the calcium hardness of the filtrate and the adhesion rate of scale were determined.
Calcium hardness of the filtrate is 290mgCaCO 3 / l, the deposition rate of the scale was 35mg / cm 2/30 days.
Comparative Example 2
Instead of a 50% by weight aqueous dispersion of heavy calcium carbonate having a particle size of 0.1 to 1.0 μm, a 20% by weight aqueous solution of polymaleic acid having a molecular weight of 3,500 was used so that the concentration of polymaleic acid was 20 mg / liter. The operation was carried out for 30 days in the same manner as in Example 1 except that the mixture was added to the circulating water, and the calcium hardness of the filtrate and the adhesion rate of scale were determined.
Calcium hardness of the filtrate is 280mgCaCO 3 / l, the deposition rate of the scale was 32mg / cm 2/30 days.
The results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24158198A JP4182454B2 (en) | 1998-08-27 | 1998-08-27 | Heat exchanger scale adhesion prevention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24158198A JP4182454B2 (en) | 1998-08-27 | 1998-08-27 | Heat exchanger scale adhesion prevention method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2000070993A JP2000070993A (en) | 2000-03-07 |
| JP2000070993A5 true JP2000070993A5 (en) | 2005-09-22 |
| JP4182454B2 JP4182454B2 (en) | 2008-11-19 |
Family
ID=17076452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24158198A Expired - Fee Related JP4182454B2 (en) | 1998-08-27 | 1998-08-27 | Heat exchanger scale adhesion prevention method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4182454B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002361286A (en) * | 2001-06-06 | 2002-12-17 | Kurita Water Ind Ltd | Method and apparatus for preventing adhesion of scale |
| EP2144986B1 (en) | 2007-05-04 | 2020-07-29 | Ecolab USA Inc. | Water treatment system and downstream cleaning methods |
| US8247363B2 (en) | 2007-05-04 | 2012-08-21 | Ecolab Usa Inc. | MG++ chemistry and method for fouling inhibition in heat processing of liquid foods and industrial processes |
| CN111732209B (en) * | 2020-07-23 | 2023-12-05 | 湖北祥云(集团)化工股份有限公司 | Method and device capable of effectively reducing scaling of phosphogypsum backwater conveying pipeline |
| CN113264597A (en) * | 2021-04-22 | 2021-08-17 | 四川绵阳岷山实业集团有限公司 | Method for inhibiting scale by using calcium carbonate aragonite seed crystals |
-
1998
- 1998-08-27 JP JP24158198A patent/JP4182454B2/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO1987002662A3 (en) | Heterocyclic analogs of mevalonolactone and derivatives thereof, processes for their production and their use as pharmaceuticals | |
| JP2000070993A5 (en) | ||
| JP2002317285A5 (en) | ||
| CN109250838A (en) | Pretreated purifier and process for purifying water are carried out using flue gas | |
| US7015254B2 (en) | Description of an inorganic polymer “electret ”in a colloidal state along with the method of generating and applications | |
| JP2004121969A (en) | Cooling water treatment method | |
| CN212954702U (en) | Zero discharging equipment of power plant's high salt waste water | |
| CN105948357B (en) | A kind of multiple cycle heat exchange industry water zero-discharge treatment system of low cost | |
| US2447511A (en) | Method of treating water | |
| CN206395987U (en) | A kind of device for handling high-salt wastewater | |
| JP3004834B2 (en) | Heat utilization system in upgrading treatment | |
| JP4178344B2 (en) | Silica scale inhibitor for cooling water system | |
| JP4182454B2 (en) | Heat exchanger scale adhesion prevention method | |
| CN208103995U (en) | A kind of steel and iron industry strong brine processing unit | |
| JP4182455B2 (en) | Scale prevention method and scale inhibitor | |
| US3252901A (en) | Method of controlling algae | |
| CN109852227A (en) | A kind of UV cure wood coatings | |
| CN209554974U (en) | A kind of system that strong brine handles and is back to urea production | |
| CN205473072U (en) | Circulating water system who adds inhibition antisludging agent | |
| CN109650598A (en) | The method of power plant effluent technique of zero discharge | |
| SU802204A1 (en) | Method of stabilizing aqueous solutions | |
| CN116444061A (en) | Clean near-zero emission assembly for cooling water circulation system | |
| CN205965537U (en) | Improvement type submergence formula ultrafiltration aeration membrane frame | |
| SU1723045A1 (en) | Boiler water treatment method | |
| JPS59217786A (en) | Solar pond of colored gel |