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船用多级闪蒸式淡化装置,其舷外海水在蓄热系统,即在冷凝器和管壳式蒸汽预热器中进行预热。由于给水温度基本上确定了结垢强度、垢的成份及其结构,因此对船用采用较低的温度,即75～80℃。具有碳酸钙结构之碳酸盐成份的垢,最适合于这种温度。船用之沉淀物的化学分析表明,沉淀物中除碳酸盐外,镁垢约占30％。如图1所示的冷凝器和预热中所形的成具有一定厚度的沉淀物,证实了结垢强度随温度增高而增大。在热强度最大的换热器,即三级闪蒸式淡化装置的预热器中,给水温度和垢层
Marine multi-stage flash desalination unit, the outboard seawater in the heat storage system, that is, in the condenser and shell and tube steam preheater for preheating. Since the feedwater temperature basically determines the fouling strength, the composition of the scale and its structure, a lower temperature for marine use, ie, 75-80 ° C, is used. Scale with a calcium carbonate carbonate structure is most suitable for this temperature. Chemical analysis of sediments from ships shows that in addition to carbonates, the magnesium scale accounts for about 30% of the sediments. As shown in Figure 1, the condenser and preheated to form a certain thickness of the precipitate, confirmed that the fouling intensity increases with increasing temperature. In the hottest heat exchanger, the preheater for the three-stage flash desalination unit, the feed water temperature and the scale