公开(公告)号：US20180215637A1

公开(公告)日：2018-08-02

申请号：US15935850

申请日：2018-03-26

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Mizuyuki SAKAI ,  Yukimasa SHIMURA

IPC: C02F5/10 ,  F22B37/52 ,  C23F14/02 ,  C11D11/00 ,  C11D7/26 ,  C08L33/02 ,  C08F120/06

Abstract: A scale remover that efficiently removes scale deposited inside a boiler without corroding a boiler includes polyacrylic acid and polymethacrylic acid and/or salts thereof.

公开(公告)号：US20170050873A1

公开(公告)日：2017-02-23

申请号：US15115493

申请日：2015-01-26

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Mizuyuki SAKAI ,  Yukimasa SHIMURA

IPC: C02F5/10 ,  C11D7/26 ,  C11D11/00 ,  F22B37/52

CPC classification number: C02F5/10 ,  B08B3/02 ,  B08B3/022 ,  B08B3/04 ,  B08B3/041 ,  C02F2303/22 ,  C08F120/06 ,  C08L33/02 ,  C11D3/2082 ,  C11D3/3757 ,  C11D3/3765 ,  C11D7/265 ,  C11D11/0041 ,  C23F14/02 ,  F22B37/52

Abstract: Provided are a method for removing scale and a scale remover that can efficiently remove scale deposited inside a boiler can or the like in an addition amount of chemicals permissible in terms of cost without corroding a boiler, particularly can efficiently remove scale deposited inside a boiler can even in a facility operated with feed water containing high-concentration iron. A method for removing scale deposited in a system of a steam generating facility, wherein polyacrylic acid having a weight-average molecular weight of more than 20,000 and 170,000 or less and/or a salt thereof is added to feed water of the steam generating facility. When the feed water contains iron, polymethacrylic acid having a weight-average molecular weight of more than 1,000 and 100,000 or less and/or a salt thereof is further added in combination.

Abstract translation: 本发明提供了一种去除氧化皮和除垢剂的方法，其可以有效地去除在锅炉罐内等离子体内沉积的垢，而不会腐蚀锅炉而成本上可允许的化学药品的添加量，特别是可以有效去除沉积在锅炉罐内的垢 即使在使用含有高浓度铁的饲料水的设施中。 一种用于去除沉积在蒸汽发生设备的系统中的垢的方法，其中将重均分子量大于20,000和17万以下的聚丙烯酸和/或其盐加入蒸汽发生设备的给水中。 当给水中含有铁时，进一步加入重均分子量大于1,000且为100,000以下的聚甲基丙烯酸和/或其盐。

公开(公告)号：US20230094476A1

公开(公告)日：2023-03-30

申请号：US17909986

申请日：2020-09-02

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Mizuyuki SAKAI ,  Kazuyoshi UCHIDA

IPC: C02F1/26

Abstract: The purpose of the present invention is to effectively reduce the corrosion fatigue of an evaporating tube in a boiler which occurs in association with a corrosive environment or repeated application of stress due to the presence of scales. A method for reducing the corrosion fatigue of an evaporating tube in a boiler, in which each of the concentration of chloride ions and the concentration of sulfate ions in the boiler water is managed at 10 mg/L or less. It is preferred to manage each of the concentration of chloride ions and the concentration of sulfate ions in boiler water by subjecting boiler feed water to a desalination treatment with an ion exchange device, a reverse osmosis membrane device or an electrodeionization device or by increasing the collection rate of boiler condensed water.

公开(公告)号：US20160075580A1

公开(公告)日：2016-03-17

申请号：US14780794

申请日：2014-03-27

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Mizuyuki SAKAI ,  Yukimasa SHIMURA

IPC: C02F5/10 ,  C11D11/00 ,  C11D3/37

CPC classification number: C02F5/10 ,  C02F1/66 ,  C02F1/68 ,  C02F2303/14 ,  C02F2303/22 ,  C02F2307/00 ,  C11D3/3757 ,  C11D11/0041 ,  C23F11/173 ,  C23F14/02 ,  F22B37/52

Abstract: Provided is a method for removing a scale in a steam generation facility, whereby it becomes possible to remove a scale deposited on the inside of a boiler vessel during the operation of a boiler without causing corrosion of the boiler. A method for removing a scale in a steam generation facility is disclosed, wherein in the steam generation facility, a pH of boiler water is adjusted to 11.3 or more, and a polyacrylic acid having a weight average molecular weight that is 0.50 to 2.00 times a reference weight average molecular weight as calculated from the following calculation formula (1), or a salt thereof, is added in accordance with the pH value of the boiler water during the operation of a boiler, thereby removing a scale deposited on the inside of a boiler vessel: Reference weight average molecular weight=−8462×{(pH value)−11.3}+61538  (1).

Abstract translation: 提供一种去除蒸汽发生设备中的氧化皮的方法，由此可以在锅炉运行期间去除在锅炉容器的内部沉积的氧化皮，而不会引起锅炉的腐蚀。 公开了一种在蒸汽发生设备中除垢的方法，其中在蒸汽发生设备中锅炉水的pH调节至11.3以上，重均分子量为0.50〜2.00倍的聚丙烯酸 根据锅炉水的pH值，根据下列计算式（1）计算的参考重均分子量或其盐根据锅炉水的pH值加入，从而除去沉积在锅炉内部的水垢 锅炉容器：参考重均分子量= -8462×{（pH值）-11.3} +61538（1）。