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Improvements to the packing seal system. For the defects and problems of the piston rod packing sealing system, the improvement is as follows: (1) The packing structure is improved. The sealing ring is changed from a straight cistern with three lobes to a slanting incision with a radial direction of 60°. This facilitates the automatic tightening compensation of the sealing ring after the inner diameter of the packing sealing ring is worn, thereby achieving the purpose of prolonging the life of the packing; 2) Insert nitrogen into the sealed cavity of the outermost set of sealing ring of the stuffing box to form a nitrogen seal, so as to achieve pressure balance inside and outside the stuffing box and effectively prevent leakage of liquefied gas; (3) Two compartments of the cylinder isolation layer The leakage discharge port is discharged separately, the oil and gas discharge port on the crankcase side is directly discharged to the high-altitude atmosphere, and the gas leakage on the cylinder side is discharged to the low-pressure pipe network to avoid mutual enthalpy; (4) The high-level discharge port on the cylinder side is collected by the low-pressure gas recovery pipe network of the main plant. Change to the liquefied gas low temperature storage facility accident special torch (the torch under normal conditions, the pipe network gas pressure is close to zero), in order to facilitate the smooth flow of the leaking gas.
The successful improvement of the reciprocating compressor packing sealing system not only solves the safety hazards that have long plagued us, but also produces good economic benefits and social environmental benefits. At the beginning of the plant's commissioning, the unit was running stably. After the plant capacity was increased from 1.2 million t/year to 2 million t/year in 1994, the unit operation was very unstable and many unplanned shutdowns occurred. There are two main reasons: First, the unit vibration is large; second, the floating ring seal is invalid. After analysis, due to the change of process composition and condition after the modification, it contains more ammonium salt and domestic catalyst dust, and the original structure type floating ring is easy to accumulate ammonium salt and is interfered by dust, which causes the floating ring to be unstable and The seal failed.
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