APPARATUS AND METHOD OF NEUTRALIZING CONDENSATE FOR PREVENTING CORROSION AT HEAT TRANSFER FACE OF CONDENSING HEAT EXCHANGER

摘要

PURPOSE: A condensate neutralizer is provided to spray boiler pipe water or blow-down water having high alkalinity to a heat transfer face to prevent the heat transfer face of a condensing heat exchanger from corrosion. CONSTITUTION: A flow limit valve(12) is mounted on a blow-down pipe. A T tube is mounted in front of the limit valve to supply a part of blow-down water to a sprayer(14) through a filter(18) via an electronic valve(11) for pH balancing. An electronic valve(9) for blow-down adopts automatic mode instead of manual one. Thereby, inner pressure of a boiler is transferred to blow-down water by the limit valve to supply the blow-down water to the sprayer in any case. The spraying amount of blow-down water is controlled depending on the opening of the electronic valve for pH balancing. High-temperature high-pressure water in a boiler pipe is cooled through a blow-down water heat exchanger(10) to prevent sudden pressure falling. To spray the boiler pipe water or the blow-down water having regular alkalinity to a spraying nozzle or a pipe, the sprayer adopts a spraying orifice. The boiler pipe water or the blow-down water is sprayed regularly to the heat transfer face of a condensing heat exchanger. Therefore, a condensate having high acidity is washed out and the heat exchanger is prevented from corrosion.