VERTICAL WASTE HEAT RECOVERY BOILER AND OPERATING METHOD THEREOF

PROBLEM TO BE SOLVED: To provide a vertical waste heat recovery boiler capable of attaining a stabilized circulating operation by preventing the generation of cavitation in a heat transfer tube of boiler water or the like and steaming generated during low load when starting a boiler and its operatin...

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Bibliographic Details
Main Authors KATSUMURA SHINICHIRO, SATAKE YUKAKO, TOMII TAKASHI
Format Patent
LanguageEnglish
Published 30.06.1998
Edition6
Subjects
AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHINBOILERS
BLASTING
CONTROLLING WATER LEVEL
FEED-WATER SUPPLY
HEATING
LIGHTING
MECHANICAL ENGINEERING
PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER
STEAM GENERATION
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide a vertical waste heat recovery boiler capable of attaining a stabilized circulating operation by preventing the generation of cavitation in a heat transfer tube of boiler water or the like and steaming generated during low load when starting a boiler and its operating method as well. SOLUTION: When starting a boiler or when the operation load is low, a minimum flow of boiler water is adapted to flow to an economizer circulation line 13 from the boiler water forced circulation line 11 leading an evaporator 5 from a steam drum so as to prevent the generation of steaming in the economizer 2, thereby compensating for the amount of water supply to the economizer 2 and gradually change the circulation of the boiler water from the forced circulation line 11 to a natural circulation line 12 after starting a vertical waste heat recovery boiler 20 or accompanied by an increase in the load. During this time, a sufficient amount of boiler water is continued to flow to the economizer circulation line 13 from the forced circulation line 11 so as to prevent the generation of cavitation of the circulation pump 10.
Bibliography:Application Number: JP19960333404