| 摘要 |
<p>A method for preventing deposits on or removing deposits from heating and ancillary surfaces of boilers and like equipment, which method comprises: continuously or intermittently introducing into the combustion chamber of the equipment or into the flue gas stream in atomised form by means of at least one injection device, a liquid additive which excludes nitrates of any alkali metal and which comprises an aqueous solution of ammonium nitrate, at least one nitrate of an alkaline earth metal, and an indicator; monitoring the pH value of the additive and, if necessary, adjusting the pH value to within the range of from 7 to 9; monitoring the dewpoint of the flue gas stream and adjusting, as necessary, the amount and composition of the additive supplied to a metering device in order to maintain the exit gas temperature of the equipment above the acid dewpoint level.</p> |
