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Title:
METHOD AND APPARATUS FOR CLEANING AND MAINTAINING BOILER PLANT
Document Type and Number:
WIPO Patent Application WO/2020/137496
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method and an apparatus for cleaning and maintaining a boiler plant, by which, in a period between chemical cleaning and initiation of normal operation, it is possible to subject parts of a boiler to be cleaned to a rust-proofing treatment at low cost and in a short time, and to maintain the boiler. This method for maintaining a boiler plant includes: a step (S2) for subjecting parts to be cleaned, which have scale attached thereto, to neutral cleaning at room temperature using a neutral cleaning liquid containing a rust preventive agent; a step (S4) for circulating an aqueous solution of an ammonia-based compound having a pH of 9.8 or more at room temperature to the parts to be cleaned; and a step (S5) for blowing the aqueous solution of an ammonia-based compound from the parts to be cleaned.

Inventors:
WADA TAKAYUKI (JP)
SHIMBO YOICHI (JP)
NOGUCHI YOSHINORI (JP)
OTSUKA MIZUKI (JP)
Application Number:
PCT/JP2019/048147
Publication Date:
July 02, 2020
Filing Date:
December 09, 2019
Export Citation:
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Assignee:
MITSUBISHI HITACHI POWER SYS (JP)
International Classes:
F22B37/00; F22B37/52; F22B37/56
Domestic Patent References:
WO2014129244A12014-08-28
Foreign References:
JP2015105786A2015-06-08
CN107059030A2017-08-18
CN101319322A2008-12-10
CN106032966A2016-10-19
JP2016017659A2016-02-01
CN205425958U2016-08-03
CN107036485A2017-08-11
JP2000279906A2000-10-10
JP2004226026A2004-08-12
JPH08219405A1996-08-30
JP2007138219A2007-06-07
JP2002129366A2002-05-09
JP2004535546A2004-11-25
JP2006322672A2006-11-30
JP2018009722A2018-01-18
Attorney, Agent or Firm:
FUJITA, Takaharu (JP)
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