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style="font-size:14px;">　　過(guò)熱器是鍋爐中將一定壓力下的飽和水蒸氣加熱成相應(yīng)壓力下的過(guò)熱水蒸氣的受熱面。過(guò)熱器的作用就是將飽和蒸汽加熱成過(guò)熱蒸汽，降低排煙損失，提高鍋爐熱效率。<br /> 　　因?yàn)殄仩t直接輸出的蒸汽叫“飽和蒸汽”也叫“濕蒸汽”，一般含有3%左右的水。過(guò)熱器有兩個(gè)目的，在工業(yè)上是為了提高整齊的溫度，所以用過(guò)熱器去提高溫度；在電站鍋爐中，過(guò)熱蒸汽是為了去除飽和蒸汽中的水分，這樣是為了保護(hù)汽輪機(jī)，如果使用飽和蒸汽讓汽輪機(jī)旋轉(zhuǎn)，由于飽和蒸汽中的水滴對(duì)汽輪機(jī)葉片的沖擊，葉片會(huì)迅速報(bào)廢，所以，要通過(guò)過(guò)熱的方法讓蒸汽干燥。同時(shí)，過(guò)熱蒸汽會(huì)提高“熵值”。<br /> 　　煙氣主要以對(duì)流的方式將熱量傳遞給管子，也有一部分輻射吸熱量。屏式過(guò)熱器由多片管屏組成，布置在爐膛內(nèi)上部或出口處，屬于輻射或半輻射式過(guò)熱器。<br /> 　　低溫過(guò)熱器作用是內(nèi)加熱的是低溫蒸汽，氣溫接近飽和溫度，一般作為過(guò)熱器系統(tǒng)的被加熱的初級(jí)過(guò)熱器，是將飽和蒸汽加熱成過(guò)熱蒸汽，降低排煙損失，提高鍋爐熱效率。<br /> 　　高溫過(guò)熱器作用是內(nèi)加熱的則是高溫蒸汽，氣溫接近額定溫度，是過(guò)熱器系統(tǒng)的末尾級(jí)過(guò)熱器）。<br /> 　　區(qū)別：一，高低溫過(guò)熱器的顯著區(qū)別就是位置不同，高溫過(guò)熱器位于爐膛出口處，低溫過(guò)熱器位于水平煙道。<br /> 　　二，低溫過(guò)熱器內(nèi)加熱的是低溫蒸汽，高溫過(guò)熱器內(nèi)加熱的則是高溫蒸汽。<br /> 　　<br /> </span></div> <div id="6q7iqyvaz" class="page" style="clear:both;"> 上一條：<a href="http:///news/zhongxin/show476.html">余熱鍋爐的產(chǎn)氣過(guò)程</a><br> 下一條：<a href="http:///news/zhongxin/show468.html">余熱鍋爐熱效率影響因素</a><br> </div> <h4 class="related"><span style="font-weight:bold;height:30px;line-height:30px;font-size:13px; color:#fff; padding-left:10px">相關(guān)資料</span></h4> <ul class="related-list"> <li><a target="_blank" title="余熱鍋爐的基本原理" href="http:///news/zhongxin/show438.html">余熱鍋爐的基本原理</a></li><li><a target="_blank" title="可利用余熱的來(lái)源" href="http:///news/zhongxin/show440.html">可利用余熱的來(lái)源</a></li><li><a target="_blank" title="余熱鍋爐的壓力等級(jí)" href="http:///news/zhongxin/show441.html">余熱鍋爐的壓力等級(jí)</a></li><li><a target="_blank" title="余熱發(fā)電應(yīng)用" href="http:///news/zhongxin/show446.html">余熱發(fā)電應(yīng)用</a></li><li><a target="_blank" title="余熱鍋爐煙道安裝設(shè)計(jì)" href="http:///news/zhongxin/show448.html">余熱鍋爐煙道安裝設(shè)計(jì)</a></li> </ul> <div id="6q7iqyvaz" class="clear"></div>  <h4 class="related"><span 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