Newly installedFractionating towerBefore driving and returning to work after stopping for a long time, it must be thoroughly heated and blown off. After being put into operation, whenFractionating towerWhen the failure of liquid suspension can not be eliminated, or the pressure difference before and after the heat exchanger pressure at the end of the operation period is more than 0.5MPa, or the purity of oxygen and nitrogen and the output decrease, it should be heated and blown off.
First of all, make preparations before heating:
1) discharge the liquid in the tower;
2) dismantle the flow meter and thermometer at the outlet of oxygen, nitrogen and distillation, dismantle the upper and lower joints of the liquid air and liquid oxygen level gauge, and dismantle all the pressure gauges except the low pressure gauge;
3) close the high pressure air General inlet valve, joint-1 valve, oxygen and nitrogen products outlet valve and heating Inlet general valve;
4) push openExpanderThe top rod of inlet and outlet valves;
5) openFractionating towerAll through valves, throttle valves, analysis valves, blow-off valves, upper and lower valves of the liquid level gauge, pressure gauge valves and heating valves on the barrel and shell;
6) fill up distilled water of the heating furnace.
The operation of heating is as follows: startAir compressor, When the pressure of the purifier rises to the normal working pressure, slowly open the heating main inlet valve, and use this valve to control the pressure of the purifier under the normal working pressure. After blowing with dry air for half an hour, switch on the heating furnace and control the outlet air temperature of the heating furnace to 70 ~ Between 80℃. During heating, the temperature of each outlet should be adjusted frequently. Close the outlet valve with high temperature a little smaller, and open the outlet valve with low temperature a little bigger, and pay attention to that the upper tower pressure should not be greater than the normal working pressure at any time. When the outlet temperature is higher than room temperature (15℃ in summer and above 5℃ in winter), heating can be stopped after the gas is dried. 0.5 before heating ends ~ 1 h, each throttle valve stem should be pulled out to blow off, and the impurities in the screw thread of the valve stem and the moisture in the valve sleeve should be removed to prevent the flexible rotation during normal operation.
