High pressure heater is a kind of heat exchange equipment which uses the steam extraction after the intermediate stage of steam turbine to heat the feed water. Heat exchange between feed water and extraction steam through heat transfer tube bundle of heater is an important means to improve economy of thermal power plant. This paper analyzes the causes of leakage of high pressure heater under the premise of ensuring the feed water temperature and the key points of operation monitoring after removal, and puts forward corresponding measures for different leakage causes, which is of great significance to the safe and economic operation of the unit.<br>
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