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传统的锅炉给水自控方式是:水位信号经差压变送器输入指示调节仪进行比较后,由调节仪对输水母管的执行机构F_1发出动作信号,即水位高关阀,水位低开阀。这种形式称之为截流式水位自控,如附图中实线部分所示。回流式给水自控则是在输水母管经省煤器后,取一流量相当于输水母管流量2/3左右的管道作回流,此管道上设有调节阀F_2,水流经调节阀F_2流往热水集箱,如附图中虚线所示。原来输水管上的调节阀F_1不再使用(作直通),其它设备不变。这样,汽包水位的变化由调节仪对F_2发出指令,即水
The traditional way of boiler feed water control is: after the water level signal is input by the differential pressure transmitter and compared with the regulator, the regulator sends an action signal to the implementing agency F_1 of the water delivery manifold, that is, the water level is high and the water level is low. . This form is called closed-loop water level control, as shown in the solid line in the figure. Backflow type water supply control is in the water pipe through the economizer, take a flow equivalent to the flow of water pipe about 2/3 of the return pipe, this pipe is equipped with regulating valve F_2, water flow through the regulating valve F_2 Flow to the hot water header, as shown by the dotted line in the figure. The original pipe F_1 valve is no longer used (for straight), other equipment unchanged. In this way, the drum level changes by the regulator on the F_2 command, that is, water