| 摘要 |
The present invention relates to a method of and an apparatus for protecting a heat exchanger against stresses caused by boiling of heat exchange medium without external energy, and a steam boiler provided with an apparatus for protecting a heat exchanger. Said apparatus is preferably used in situations in which heat is recovered from the flue gas flow of thermal power boilers in conditions, where there is a risk of boiling of the water used as heat exchange medium. A protection circuit of a heat exchanger in accordance with the present invention comprises an expansion vessel (52), which in case of boiling, provides natural circulation of water, for cooling a heat exchanger (36) without external energy or control. |
