SCALE REMOVAL METHOD AND SCALE REMOVAL AGENT FOR STEAM GENERATING FACILITIES

Title:

SCALE REMOVAL METHOD AND SCALE REMOVAL AGENT FOR STEAM GENERATING FACILITIES

Document Type and Number:

WIPO Patent Application WO/2015/122264

Kind Code:

A1

Abstract:

Provided are a scale removal method and a scale removal agent, both of which can efficiently remove scales adhered onto the inside of a boiler can or the like without causing the corrosion of a boiler in a steam generating facility even when used in an economically acceptable addition amount, particularly can efficiently remove scales adhered onto the inside of a boiler can even in a steam generating facility that can be operated with feed water containing iron at a high concentration. A scale removal method for removing scales adhered onto the inside of a system of a steam generating facility, wherein a 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. When the feed water contains iron, a polymethacrylic acid having a weight average molecular weight of more than 1,000 and 100,000 or less and/or a salt thereof is also added in combination.

More Like This:

WO/1991/017124

NEW FORMULATIONS FOR IRON OXIDES DISSOLUTION

Inventors:

SAKAI MIZUYUKI (JP)
SHIMURA YUKIMASA (JP)

Application Number:

PCT/JP2015/052012

Publication Date:

August 20, 2015

Filing Date:

January 26, 2015

Export Citation:

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Assignee:

KURITA WATER IND LTD (JP)

International Classes:

C02F5/10; C02F5/00; F22B37/52

Domestic Patent References:

WO2013140913A1	2013-09-26
WO2013058115A1	2013-04-25
WO2005116296A1	2005-12-08
WO2014162992A1	2014-10-09

Foreign References:

JP2010172816A	2010-08-12
JPS59189998A	1984-10-27
JP2000154996A	2000-06-06
JP2013022535A	2013-02-04
JP2008006369A	2008-01-17
JPS6365999A	1988-03-24

Other References: