6RA2325-6DS21-0
6RA2325-6DS21-0
6RA2325-6DS21-0
6RA2325-6DS21-0
锅炉设备是一个复杂的控制对象，
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《QQ邮箱：2479261344@qq.com》主要输入变量是负荷、锅炉给水、燃料量、减温水、送风和引风等；主要输出变量是汽包水位、蒸汽压力、炉膛负压、过剩空气等。因输入变量与输出变量相互关联，如果蒸汽负荷发生变化，必将会引起汽包水位、蒸汽压力和过热蒸汽温度的变化。所以说锅炉是一个多输入、多输出且相互关联的控制对象，本控制系统将其分为送风系统、炉膛负压系统、磨煤热风系统、汽包水位系统、汽包压力和主汽温度系统几部分（见图6）。
以汽包水位系统为例，受控变量是汽包水位，操纵变量是给水流量。它主要考虑汽包内部的物料平衡，使给水量适应锅炉的蒸发量，维持汽包中水位在工艺允许范围之内，这是保证锅炉、汽轮机安全运行的必要条件之一，是锅炉正常运行的重要指标。
1. 汽包水位的动态特性
a.蒸汽负荷（蒸汽流量）对水位的影响，即干扰通道的动态特性。主要是在蒸汽量突然增加时，产生假水位现象。
b.给水流量对水位的影响，即控制通道的动态特性。当给水时，给水温度和汽包内的水温相差很大，所以给水量增加后，使汽包中汽泡含量减少，导致水位下降。
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Dell PowerEdge R410 Dual E5620 2.40GHZ 16GB RAM 1X450GB
HP Proliant DL180 G6 Server Xeon E5620 2.40GHz 4GB RAM
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