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class="bread"> 當前位置：<a href="/">首頁</a>><a href="/news/jswz.html">技術文章</a>>凝結水回收系統水力計算</div> </div> <div class="view"> <h1 class="view-title">凝結水回收系統水力計算</h1> <div class="view-date">發布時間：2020年05月08日來源：河北越吉環?？萍加邢薰?/div> <p><div id="MyContent"><p style="text-align:center;line-height:150%"><strong><span style="font-size:21px;line-height:150%;font-family:宋體">凝結水回收系統水力計算</span></strong></p><p style="line-height:150%"><strong><span style="font-size:16px;line-height:150%;font-family:宋體">一、水力計算的任務</span></strong></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">1.</span><span style="font-size:16px;line-height:150%;font-family:宋體">根據凝結水的流量和管道的允許壓力降，計算管道的直徑；</span></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">2.</span><span style="font-size:16px;line-height:150%;font-family:宋體">根據凝結水的流量和管道直徑，計算其管道壓力降并確定管道中各點的壓力；</span></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">3.</span><span style="font-size:16px;line-height:150%;font-family:宋體">根據管道直徑及允許壓力降，核算管道的輸送流量；</span></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">4.</span><span style="font-size:16px;line-height:150%;font-family:宋體">按保溫方式和保溫材料，計算管道散熱量。</span></p><p style="line-height:150%"><strong><span style="font-size:16px;line-height:150%;font-family:宋體">二、基本參數的選擇</span></strong></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">1.</span><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水管道流速：</span></p><table cellspacing="0" cellpadding="0" width="300"><tbody><tr class="firstRow"><td width="200" colspan="2" style="border: 1px solid windowtext; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水管道流速</span></p></td></tr><tr><td width="150" style="border-right: 1px solid windowtext; border-bottom: 1px solid windowtext; border-left: 1px solid windowtext; border-image: initial; border-top: none; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">管道類型</span></p></td><td width="200" style="border-top: none; border-left: none; border-bottom: 1px solid windowtext; border-right: 1px solid windowtext; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">流速</span><span style="font-size:16px;line-height:150%">m/s</span></p></td></tr><tr><td width="150" style="border-right: 1px solid windowtext; border-bottom: 1px solid windowtext; border-left: 1px solid windowtext; border-image: initial; border-top: none; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">主管線回水管道</span></p></td><td width="200" style="border-top: none; border-left: none; border-bottom: 1px solid windowtext; border-right: 1px solid windowtext; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size: 16px;line-height:150%">0.5</span><span style="font-size:16px;line-height:150%;font-family:宋體">～</span><span style="font-size:16px;line-height:150%">3</span></p></td></tr><tr><td width="150" style="border-right: 1px solid windowtext; border-bottom: 1px solid windowtext; border-left: 1px solid windowtext; border-image: initial; border-top: none; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">分支線回水管道</span></p></td><td width="200" style="border-top: none; border-left: none; border-bottom: 1px solid windowtext; border-right: 1px solid windowtext; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size: 16px;line-height:150%">3</span><span style="font-size:16px;line-height:150%;font-family:宋體">～</span><span style="font-size:16px;line-height:150%">5</span></p></td></tr></tbody></table><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">2.</span><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水泵進出管流速：</span></p><table cellspacing="0" cellpadding="0" width="300"><tbody><tr class="firstRow"><td width="100" colspan="2" style="border: 1px solid windowtext; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水泵進出管流</span></p></td></tr><tr><td width="62" style="border-right: 1px solid windowtext; border-bottom: 1px solid windowtext; border-left: 1px solid windowtext; border-image: initial; border-top: none; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">管道類型</span></p></td><td width="37" style="border-top: none; border-left: none; border-bottom: 1px solid windowtext; border-right: 1px solid windowtext; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">流速</span><span style="font-size:16px;line-height:150%">m/s</span></p></td></tr><tr><td width="62" style="border-right: 1px solid windowtext; border-bottom: 1px solid windowtext; border-left: 1px solid windowtext; border-image: initial; border-top: none; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水泵進口</span></p></td><td width="37" style="border-top: none; border-left: none; border-bottom: 1px solid windowtext; border-right: 1px solid windowtext; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size: 16px;line-height:150%">0.5</span><span style="font-size:16px;line-height:150%;font-family:宋體">～</span><span style="font-size:16px;line-height:150%">1.0</span></p></td></tr><tr><td width="62" style="border-right: 1px solid windowtext; border-bottom: 1px solid windowtext; border-left: 1px solid windowtext; border-image: initial; border-top: none; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水泵出口</span></p></td><td width="37" style="border-top: none; border-left: none; border-bottom: 1px solid windowtext; border-right: 1px solid windowtext; padding: 0px 7px;"><p style="text-align:center;text-indent:32px;line-height:150%"><span style="font-size: 16px;line-height:150%">1</span><span style="font-size:16px;line-height:150%;font-family:宋體">～</span><span style="font-size:16px;line-height:150%">3</span></p></td></tr></tbody></table><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">3.</span><span style="font-size:16px;line-height:150%;font-family:宋體">二次蒸汽管道流速：</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family: 宋體">（</span><span style="font-size:16px;line-height:150%">1</span><span style="font-size:16px;line-height:150%;font-family:宋體">）分支管超壓排放管道：分支管至主管線節點通過節流、擴容等手段無法調節平衡壓力時，必須設超壓排放管道及閥門，二次蒸汽排放速度</span><span style="font-size:16px;line-height:150%">ν</span><span style="font-size:16px;line-height:150%">=15~30m/s</span><span style="font-size:16px;line-height: 150%;font-family:宋體">。</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family: 宋體">（</span><span style="font-size:16px;line-height:150%">2</span><span style="font-size:16px;line-height:150%;font-family:宋體">）凝結水回收罐超壓排放管道：二次蒸汽利用排放時</span><span style="font-size:16px;line-height:150%">ν</span><span style="font-size:16px;line-height:150%"> ≤25m/s</span><span style="font-size:16px;line-height: 150%;font-family:宋體">；二次蒸汽不利用排放時</span><span style="font-size:16px;line-height:150%">ν</span><span style="font-size:16px;line-height:150%"> =60m/s</span><span style="font-size:16px;line-height: 150%;font-family:宋體">。</span></p><p style="line-height:150%"><strong><span style="font-size:16px;line-height:150%;font-family:宋體">三、相對粗糙度</span></strong><strong><span style="font-size:16px;line-height:150%">K<sub>d</sub></span></strong></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">1.</span><span style="font-size:16px;line-height:150%;font-family:宋體">閉式系統回水管</span><span style="font-size:16px;line-height:150%">K<sub>d</sub>=0.5mm</span><span style="font-size:16px;line-height:150%;font-family:宋體">；</span></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%">2.</span><span style="font-size:16px;line-height:150%;font-family:宋體">二次蒸汽管</span><span style="font-size:16px;line-height:150%">K<sub>d</sub>=0.2mm</span><span style="font-size:16px;line-height:150%;font-family:宋體">。</span></p><p style="line-height:150%"><strong><span style="font-size:16px;line-height:150%;font-family:宋體">四、凝結水管網水力計算基本公式</span></strong></p><p style="line-height:150%"><span style="font-size: 16px;line-height:150%">1.</span><span style="font-size:16px;line-height:150%;font-family:宋體">基本符號</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">D<sub>n</sub>—</span><span style="font-size:16px;line-height:150%;font-family:宋體">管子內徑：</span><span style="font-size: 16px;line-height:150%">m</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">G —</span><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水的質量流量：</span><span style="font-size:16px;line-height: 150%">t/h</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">P </span><span style="font-size:16px;line-height:150%">—</span><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水的管段密度：</span><span style="font-size:16px;line-height:150%">kg/m<sup>3</sup></span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">V —</span><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水的管段平均流速：</span><span style="font-size:16px;line-height:150%">m/s</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">R</span><span style="font-size:16px;line-height:150%">—</span><span style="font-size:16px;line-height:150%;font-family:宋體">凝結水的管段平均比摩阻：</span><span style="font-size:16px;line-height:150%">Pa</span><span style="font-size:16px;line-height:150%">/m</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">P<sub>1</sub>—</span><span style="font-size:16px;line-height:150%;font-family:宋體">管道內起點壓力，即疏水器出口壓力：</span><span style="font-size:16px;line-height:150%">Pa </span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">P<sub>2</sub>—</span><span style="font-size:16px;line-height:150%;font-family:宋體">管道內終點壓力，即集水罐或閃蒸罐壓力：</span><span style="font-size:16px;line-height:150%">Pa</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">P<sub>3</sub>—</span><span style="font-size:16px;line-height:150%;font-family:宋體">管道翻高時壓力損失：</span><span style="font-size:16px;line-height:150%">Pa </span><span style="font-size:16px;line-height:150%;font-family:宋體">；</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">L—</span><span style="font-size:16px;line-height:150%;font-family:宋體">管道直線長度：</span><span style="font-size:16px;line-height:150%">m</span><span style="font-size:16px;line-height:150%;font-family:宋體">；</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%">L</span><sub><span style="font-size:16px;line-height:150%">d</span></sub><span style="font-size:16px;line-height:150%">—</span><span style="font-size:16px;line-height:150%;font-family:宋體">管道局部阻力的當量長度：</span><span style="font-size:16px;line-height:150%">m</span><span style="font-size:16px;line-height:150%;font-family:宋體">；</span></p><p style="line-height:150%"><span style="font-size: 16px;line-height:150%">2.</span><span style="font-size:16px;line-height:150%;font-family:宋體">管線管徑計算：</span></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">（</span><span style="font-size:16px;line-height:150%">1</span><span style="font-size:16px;line-height:150%;font-family:宋體">）按流速確定管徑：</span><span style="font-size:16px;line-height:150%"> </span></p><p style="text-indent:256px;line-height:150%"><span style="font-size:16px;line-height:150%"> <a href="javascript:;" onclick="showimg('/UploadFiles/2020-05/15889178471170255.png');"><img src="/UploadFiles/2020-05/15889178471170255.png" alt="凝結水回收系統水力計算" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a> </span><span style="font-size:16px;line-height:150%">m </span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%"> </span></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">（</span><span style="font-size:16px;line-height:150%">2</span><span style="font-size:16px;line-height:150%;font-family:宋體">）按比摩阻確定管道管徑：</span><span style="font-size:16px;line-height:150%"> </span></p><p style="text-indent:272px;line-height:150%"><span style="font-size:16px;line-height:150%"><a href="javascript:;" onclick="showimg('/UploadFiles/2020-05/15889178577315458.png');"><img src="/UploadFiles/2020-05/15889178577315458.png" alt="凝結水回收系統水力計算" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a>m</span></p><p style="line-height:150%"><span style="font-size: 16px;line-height:150%"> </span></p><p style="line-height:150%"><span style="font-size:16px;line-height:150%">3.</span><span style="font-size:16px;line-height:150%;font-family:宋體">比摩阻計算：</span></p><p style="line-height:150%"><span style="font-size: 16px;line-height:150%"> <a href="javascript:;" onclick="showimg('/UploadFiles/2020-05/15889178686253629.png');"><img src="/UploadFiles/2020-05/15889178686253629.png" alt="凝結水回收系統水力計算" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a> </span><span style="font-size:16px;line-height:150%">Pa/m </span></p><p style="line-height:150%"><span style="font-size: 16px;line-height:150%">4.</span><span style="font-size:16px;line-height:150%;font-family:宋體">流量計算公式：</span></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family: 宋體">（</span><span style="font-size:16px;line-height:150%">1</span><span style="font-size:16px;line-height:150%;font-family:宋體">）按流速計算</span></p><p style="text-indent:16px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">（</span><span style="font-size:16px;line-height:150%">2</span><span style="font-size:16px;line-height:150%;font-family:宋體">）按比摩阻計算管段流量：</span><span style="font-size:16px;line-height:150%"> </span></p><p style="text-indent:208px;line-height:150%"><span style="font-size:16px;line-height:150%"> <a href="javascript:;" onclick="showimg('/UploadFiles/2020-05/15889178785033598.png');"><img src="/UploadFiles/2020-05/15889178785033598.png" alt="凝結水回收系統水力計算" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a></span><span style="font-size:16px;line-height:150%">t/h</span></p><p style="line-height:150%"><span style="font-size: 16px;line-height:150%"> </span></p><p style="line-height:150%"><span style="font-size:16px;line-height:150%">5.</span><span style="font-size:16px;line-height:150%;font-family:宋體">流速計算：</span><span style="font-size:16px;line-height:150%"> </span></p><p style="text-indent:144px;line-height:150%"><span style="font-size:16px;line-height:150%"> <a href="javascript:;" onclick="showimg('/UploadFiles/2020-05/15889178899174482.png');"><img src="/UploadFiles/2020-05/15889178899174482.png" alt="凝結水回收系統水力計算" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a> </span><span style="font-size:16px;line-height:150%">m/s</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family: 宋體">注：管線限定流速非標準規定，一般小于</span><span style="font-size:16px;line-height:150%">5m/s</span></p><p style="line-height:150%"><span style="font-size: 16px;line-height:150%">6.</span><span style="font-size:16px;line-height:150%;font-family:宋體">管線允許比壓降計算</span></p><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">（</span><span style="font-size:16px;line-height:150%">1</span><span style="font-size:16px;line-height:150%;font-family:宋體">）余壓凝結水管道</span><span style="font-size:16px;line-height:150%"> </span></p><p style="line-height:150%"><span style="font-size: 16px;line-height:150%"> <a href="javascript:;" onclick="showimg('/UploadFiles/2020-05/15889178988462568.png');"><img src="/UploadFiles/2020-05/15889178988462568.png" alt="凝結水回收系統水力計算" onmousewheel="return bbimg(this)" onload="javascript:resizepic(this)" border="0"/></a> </span><span style="font-size:16px;line-height:150%">Pa/m</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family: 宋體">注：在概算時</span><span style="font-size:16px;line-height: 150%">L<sub>d</sub></span><span style="font-size:16px;line-height:150%;font-family:宋體">可取</span><span style="font-size:16px;line-height:150%">L<sub>d</sub> =</span><span style="font-size: 16px;line-height:150%"> aL</span><span style="font-size:16px;line-height:150%;font-family:宋體">，</span><span style="font-size:16px;line-height:150%"> a</span><span style="font-size:16px;line-height:150%;font-family:宋體">一般可取</span><span style="font-size:16px;line-height:150%">0.3~0.4</span><span style="font-size:16px;line-height:150%;font-family:宋體">。</span></p><p style="line-height:150%"><span style="font-size:16px;line-height:150%;font-family:宋體">（</span><span style="font-size:16px;line-height:150%">2</span><span style="font-size:16px;line-height:150%;font-family:宋體">）自流凝結水管道</span></p><p style="text-indent:32px;line-height:150%"><span style="font-size:16px;line-height:150%;font-family: 宋體">按用汽設備始端壓力、經濟比摩阻范圍，確定凝結水輸送距離。</span></p><p style="text-indent:32px;line-height:150%"><strong><span style="font-size:16px;line-height:150%"> 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