IT1157066B - Removing solid coatings off surfaces of furnaces or boilers - Google Patents

Removing solid coatings off surfaces of furnaces or boilers

Info

Publication number
IT1157066B
IT1157066B IT68180/82A IT6818082A IT1157066B IT 1157066 B IT1157066 B IT 1157066B IT 68180/82 A IT68180/82 A IT 68180/82A IT 6818082 A IT6818082 A IT 6818082A IT 1157066 B IT1157066 B IT 1157066B
Authority
IT
Italy
Prior art keywords
compsn
cleaning
coatings
alkali
boilers
Prior art date
Application number
IT68180/82A
Other languages
Italian (it)
Other versions
IT8268180A0 (en
Inventor
Joe Inge Olgart Johannesson
Bengt Goran Lundstrom
Sven Gunnar Svensson
Sven Erik Agertegh
Sven Roland Agertegh
Vlastimir Mikulasek
Original Assignee
Johannesson Joe Inge Olgarth
Lundstroem Bengt Goeran
Sven Gunnar Svensson
Climatic Ab
Dalf International Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from PCT/SE1982/000125 external-priority patent/WO1982004065A1/en
Application filed by Johannesson Joe Inge Olgarth, Lundstroem Bengt Goeran, Sven Gunnar Svensson, Climatic Ab, Dalf International Ab filed Critical Johannesson Joe Inge Olgarth
Publication of IT8268180A0 publication Critical patent/IT8268180A0/en
Application granted granted Critical
Publication of IT1157066B publication Critical patent/IT1157066B/en

Links

Landscapes

  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

Soot and solid coatings on surfaces in enclosed spaces, such as the flue gas side in a furnace or boiler, are removed using steam which has been saturated with an aq. compsn. including synthetic tensides, alkali, silicates, phosphates, complexing agents, solvent and solvent vehicle and a corrosion inhibitor. The cleaning is followed by a surface passivating step for the cleaned surfaces in which a passivating agent is supplied to counteract the continued coating of the metal surfaces. The compsn. produces a pH value increase to create a basic environment in which harmful S compounds in the coatings are transformed along with heavy metals, into harmless salts. If any H2SO4 is formed it is neutralised by the alkali in the compsn. The cleaning may be a single or a multi-step process. Cleaning times are reduced.
IT68180/82A 1982-04-19 1982-10-08 Removing solid coatings off surfaces of furnaces or boilers IT1157066B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1982/000125 WO1982004065A1 (en) 1981-05-20 1982-04-19 Process and device for loosening and removing solid coatings on the surfaces of enclosed spaces,e.g.the flue gas side of a furnace or boiler

Publications (2)

Publication Number Publication Date
IT8268180A0 IT8268180A0 (en) 1982-10-08
IT1157066B true IT1157066B (en) 1987-02-11

Family

ID=20345688

Family Applications (1)

Application Number Title Priority Date Filing Date
IT68180/82A IT1157066B (en) 1982-04-19 1982-10-08 Removing solid coatings off surfaces of furnaces or boilers

Country Status (1)

Country Link
IT (1) IT1157066B (en)

Also Published As

Publication number Publication date
IT8268180A0 (en) 1982-10-08

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