| 摘要 |
<p>A method for removing scale, sludge, corrosion and other debris and deposits from the interior of a heat exchanger vessel such as a nuclear steam generator, includes generating pressure pulses in a non-corrosive, strongly basic, amine-containing chemical cleaning agent in aqueous solution after the agent has been introduced into the interior of the vessel. The chemical cleaning agent is an aqueous solution containing at least one of the group of lower alkyl amines and cyclic diimines or combinations thereof. The method further includes simultaneously recirculating the chemical cleaning agent through a filter assembly during the pressure pulsing operation in order to remove fluidized sludge and corrosion products dislodged by the pressure pulsing and chemical action. The method reduces the time required for a particular chemical cleaning agent to effectively clean the vessel and the number of times such chemicals need to be introduced into the vessel, which in turn results in the production of less radioactive liquid waste, and minimizes new corrosion through use of relatively non-corrosive cleaning agents.</p> |
