中国电力科技论坛
标题:
《集控值班员》理论题
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作者:
华电之声
时间:
2008-4-24 10:21
标题:
《集控值班员》理论题
<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US"><font face="Times New Roman">21</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">．什么是</span><span lang="EN-US"><font face="Times New Roman">"</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">虚假水位</span><span lang="EN-US"><font face="Times New Roman">"</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">？锅炉出现</span><span lang="EN-US"><font face="Times New Roman">"</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">虚假水位</span><span lang="EN-US"><font face="Times New Roman">"</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">时如何处理？</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">答：</span><span lang="EN-US"><font face="Times New Roman">"</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">虚假水位</span><span lang="EN-US"><font face="Times New Roman">"</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">就是暂时的不真是水位。当汽包压力突降时，由于炉水饱和温度下降到相应压力下的饱和温度而放出大量热量并自行蒸发，于是炉水内气泡增加，体积膨胀，使水位上升，形成虚假水位。当汽包压力突升，则相应的饱和温度提高，一部分热量被用于炉水加热，使蒸发量减少，炉水中气泡量减少，体积收缩，促使水位降低，同样形成虚假水位。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">锅炉负荷突变、灭火、安全门动作、燃烧不稳等运行情况不正常时，都会产生虚假水位。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">当锅炉出现虚假水位时，首先应正确判断，要求运行人员经常监视锅炉负荷的变化，并对具体情况具体分析，才能采取正确的处理措施。如当负荷急剧增加而水位突然上升时，应明确：从蒸发量大于给水量这一平衡的情况看，此时的水位上升现象是暂时的，很快就会下降，切不可减少进水，而应强化燃烧，恢复汽压，待水位开始下降时，马上增加给水量，时使其与蒸发量相适应，恢复正常水位。如果负荷上升的幅度较大，引起的水位变化幅度也很大，此时若控制不当就会引起满水，就应先适当减少给水量，以免满水，同时强化燃烧，恢复汽压；当水位刚有下降趋势时，立即加大给水量，否则又会造成水位过低。也就是说，应做到判断准确，处理及时。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US"><font face="Times New Roman">22</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">．锅炉尾部烟道二次燃烧的现象、原因及处理？</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">答：烟道二次燃烧的现象：</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US"><font face="Times New Roman">1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）烟气温度急剧上升，氧量表指示偏小。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US"><font face="Times New Roman">2</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）烟道及炉膛负压剧烈变化，一、二次热风温度和排烟温度不正常升高。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US"><font face="Times New Roman">3</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）烟道门孔或不严密处有火星或冒烟。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US"><font face="Times New Roman">4</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）烟囱冒黑烟。</span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">（</span><span lang="EN-US"><font face="Times New Roman">5</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">）如空气预热器二次燃烧时，外壳有温度辐射感受或烧红，严重时空气预热器卡涩。</span></p>
作者:
zdfbzdfb
时间:
2010-4-3 20:45
<p>感谢分享，辛苦了。</p>
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