Air cooling towerIf the automatic adjustment system of the liquid level fails, it is easy to cause the water inflow accident of the air separation tower, so the reliability of the self-adjustment system of the liquid level must be improved. Attention should be paid when installing:
1) the differential pressure transmitter should be installed on the same standard level as the bottom of the air cooling tower;
2) positive pressure and negative pressure diversion pipes should be introduced into differential pressure transmitter on the same horizontal plane;
3) in winter, heating and antifreezing measures should be taken to prevent the static water in the diversion pipe from freezing.
In order to improve its working stability and accuracy, a standard liquid level container can be installed in the negative pressure lead-out pipe. In the standard liquid level container, the height H of the liquid level is maintained constant by supplementary water and overflow pipe, which is generally consistent with the highest liquid level in the tower. In this way, both the positive and negative pressure chamber of the pneumatic differential pressure transmitter can enter water at the same time, eliminating the measurement error caused by the small amount of water in the original negative pressure tube (air pipe. The pressure felt by the negative pressure chamber is constant (= & rho; gHo, & rho; is the density of water), and its output signal is proportional to the liquid level height of the air cooling tower day by day: △p = & rho; g (H-Ho ). After adopting the standard liquid level container, the use effect is very good, the work is stable and reliable, and the automatic adjustment is guaranteed.
