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Title:
CHEMICAL WASHING LIQUID FOR SCALE IN GEOTHERMAL POWER GENERATION PLANT
Document Type and Number:
Japanese Patent JPS63176485
Kind Code:
A
Abstract:

PURPOSE: To obtain chemical washing liquid capable of effectively dissolving and removing scale consisting of SiO2 as a main component by adding hydrochloric acid or sulfuric acid at specified concn. to the aq. soln. of neutral fluorine compd. and furthermore adding polymeric phosphate and an acid etching inhibitor thereto.

CONSTITUTION: Chemical washing liquid for scale of a geothermal power generation plant is obtained by adding 4W10wt.% hydrochloric acid or sulfuric acid to the aq. soln. of at least one or more kinds of neutral fluorine compd. and furthermore adding polymeric phosphate and an acid etching inhibitor thereto. As the above-mentioned neutral fluorine compd., NH4F, KF and NaF, etc., are used at about 5W10% expressed in terms of F. Further as polymeric phosphate, pyrophosphate or the like is used and added at about one equivalent for Ca incorporated in scale to solubilize it. As the acid etching inhibitor, an organic amine-base inhibitor is used at about 0.3W0.5% to prevent soft etching of a steel product. Hard scale consisting of SiO2 as a main component is dissolved and also acid etching of the steel product is inhibited at a negligible degree by using this chemical washing liquid at about 60W70°C.


Inventors:
HAYASHI YUKIO
KAWAZOE SANAE
Application Number:
JP1987000004799
Publication Date:
July 20, 1988
Filing Date:
January 14, 1987
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
F28G9/00; C23G1/02; (IPC1-7): C23G1/02; F28G9/00



 
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