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For the petrochemical industry, the selection of high temperature heavy oil pump with mechanical seal has been a major problem, such as catalytic cracking oil slurry pump, to pump oil refining, atmospheric tower bottom pump, initial boiling tower bottom pump, vacuum tower bottom pump, delay coking of radiation feeding pump.
The medium of high temperature and heavy oil pump has the following characteristics:
High temperature: generally in 340 ~ 400;
Medium viscosity, temperature in the general kinematic viscosity for (12 ~ 180) x 10 -6m / S; dielectric particles, such as catalyst, coke, containing sand and other impurities.
Mechanical seal for high temperature heavy oil medium pump. Now all enterprises use the welding metal bellows mechanical seal. Customers reflect the good Wuhan Bergman PMFL85, PMFL80 type, etc.. Bellows with AM350, Inconel718, Hastelloy B and C on the stainless steel material; high temperature corrosion resistant alloy, some wave plate with double layer structure, the bearing pressure from 2MPa to rise to 5 MPa. These are an effective solution to the problem of bellows and loss of shells.
Aiming at the inner side of the corrugated pipe coking and carbon deposition and containing solid particles, the solution relevant information has done a related note, such as the use of steam blowing scan, friction pair with "hard to hard", using external flushing and so on, these in a certain extent, has played a good role, here no longer had expounded. But the effect of various factors is not satisfactory. In order to improve the service life of the mechanical seal, and save energy and reduce consumption, it is suggested that the following measures should be integrated:
A) the metal corrugated pipe is designed for rotary type structure, rotating bellows mechanical seal self cleaning of centrifugal effect, which can reduce the peripheral deposition and medial coking of the corrugated pipe.
B) pairs of friction pairs of materials, the use of the "hard to hard" structure, generally using tungsten carbide (YG6-YG6) and tungsten carbide. Selection of hard to hard structure, we must pay attention to the following issues:
1) cooling system to guarantee, disable interrupt cooling water, to prevent the face rising, flash evaporation of lubrication film decreased seal lubrication, the wear is intensified; (2) mechanical seal in installation process, can be to seal face painted a little clean silicone oil. To prevent the pump from. Seal face due to lack of lubrication caused by dry friction; and (3) using clean washing is to solve one of the effective methods for bulk solvent particles, but this method results in the waste of a large and various pump medium, temperature, pressure (General requirements for flushing fluid pressure than the lateral pressure of medium high from 0.07 to 0.12 MPa) and not the same, external flushing system structure is more complicated, in addition flushing facilities investment and maintenance costs of consumption, sometimes causing more harm than benefit, especially some small and medium enterprises. So many enterprises the seal oil system of abandoned, or there is no design this system, for these situations, recommend the use of matched dielectric isolation sealing structure, such as the oil pump, to pump oil refining and so on, use double end face mechanical seal, in the two sets of sealing face between full dielectric isolation (clean oil, etc.).