Harbin Gasification Plant Branch has two sets of air separation 10000m3 / h Air Separation
Equipment, at 15:30 on May 3, 2005 or so, 1 # 10000m3 / h Air
Separation plant oxygen pump is running, the scene heard a sudden "bang"
Abnormal sound is heard, the control room sound and light alarm display high-temperature liquid oxygen pump shaft
Interlock shutdown. Operator hastily rushed to the scene and found the liquid oxygen pump attached to
Near a small number of pearlescent sand spills, pump the top of the cold box has a little distortion,
Some hot liquid oxygen pump motor. Hand rotation motor bearings, found that
Serious jamming phenomenon, must be dismantled pump maintenance. Liquid Oxygen Pump-free
Therefore, downtime, leading to 10000m3 / h air separation plant oxygen and nitrogen production by the
Limitations that affect the production system the follow-up of oxygen, nitrogen supply.
Found during the demolition of pump, pump bearings at the sealing rooms are dark
And the burnt marks, sealing gasket damaged more serious, sealed chamber micro -
Small deformation, motor bearing small distortion, motor and pump, and other Department of
Piece is not damaged. Above shows took place in the liquid oxygen pump is blasting off
Like. In this paper, blasting and maintenance of liquid oxygen pump to do a set for the same
Line reference.
Parameters of a liquid oxygen pump technology
Liquid Oxygen Pump with labyrinth seal pumps, main technical parameters:
Model BP092121621; flow of 1419m3 / h; head 518m; suction
Into the pressure of 013MPa (A);-power 111kW; speed 1450rPmin;
Motor model DKN130624, special motors.
Two reasons for blasting
After careful analysis, combustibles are bearing grease, traces of oil
Grease or oil vapor may enter the sealed chamber near the bearings Department. Combustion-supporting material
Oxygen from the liquid oxygen pump itself, released into the sealed chamber. Flame source production
Health may be two kinds: ① labyrinth seal gap is too small, especially in the low -
Temperature deformed state, when you start running friction between the production of metal
Health spark; ② motor damp leakage will produce sparks.
3 precautions
In addition to the structure to ensure, so far as motor and pump shaft
From the use of non-ferrous metals and seals to prevent sparks occurred outside, in the parade
To allow for the operation procedures to strictly observe: ① the cooling liquid oxygen pump before the start of
In addition to valve should be blown open, the first pass of the labyrinth seal by blowing nitrogen at room temperature except
10 ~ 20min, on the one hand to drive away the oxygen, while sealing back to
Gap at room temperature; ② the first pass into the sealed gas, adjusted to the proper pressure, and then
Open the pump inlet and outlet valves, so that the cooling liquid oxygen into the pump, this time sealing
Gas pressure must be higher than the inlet pressure of about 0105MPa; ③ plate cars,
Determine the fault-free, start pump, pay attention to the pump inlet pressure is stable
Setting, such as pressure fluctuations or pressure does not rise in exports is likely to produce cavitation
Phenomenon, we must open the exhaust valve pump body upper part, to continue the cooling liquid oxygen pumps,
Pressure tends to stabilize, to control seal gas pressure than the pressure seal ago
Li Gao 01005 ~ 0101MPa.
4 normal operation and maintenance
(1) The liquid oxygen pumps in operation shall not close the imported valve, seal gas is not
Be discontinued, should always be adjusted.
(2) Each 1h check a second import and export of gas pressure and the sealing pressure,
Flow is normal, whether there are gas and liquid leakage.
(3) Every 1h check a second pump-side bearing temperature and motor temperature,
Bearing temperature should be controlled at - 25 ℃ ~ 70 ℃.
(4) Every 2h check a second liquid oxygen pump functioning.