Analysis of filter applications Two typical faults - filter failure - filtration and separation industry

Analysis of filter applications Two typical faults - filter failure - filtration and separation industry

Centrifugal compressor mechanical seal supply system, bearing oil supply system, reciprocating piston pump bearings and bearing oil supply system as well as rotating equipment fluid inlet interception devices, require the installation of filters. Filter the wide range of fiber body, but also the metal net. According to the lubrication equipment requirements of different media, filters, filter is divided into two kinds of fine and coarse filters. Fine filter of general application in the equipment required for the friction pair of gas or liquid lubricants, the required filtration precision, and the equipment is often high-speed, high pressure, heavy, if inadvertently, causing serious consequences; coarse filter usually used in pumps rotating equipment, fluid inlet pipe, from the Trash, bar complex, protecting equipment from a large body of debris interference. It should be said, the filter is an auxiliary device, in practice, depending on the device on the accuracy of the fluid, the selected mesh, pressure meter according to the site to decide whether to replace the filter conditions, the safety operation is guaranteed .

But the fine filter cartridge is generally bound by the asbestos fibers rolled steel plate attached to the strengthening of on-line, with strong direction, if the fluid from the reverse import, asbestos fibers will be blown inside the friction pair, causing friction Vice-destruction; coarse filter to block impurity, and impurity precipitation, but also design direction, once the direction of anti-loaded, will cause irregular drying fluid, the equipment itself and the follow-up of the main equipment, lubrication may be affected. This is because the filter direction, it appears the reality of the installation error. Chongqing Jian Feng Chemical Fertilizer Co., Ltd. is common filter applications, driving since the filter more or less some problems, but from the perspective of a problem to install two, the first high-pressure cylinder of carbon dioxide compressor seal gas filter fault, and second, urea reactor feed small ammonia circulating pump crankcase oil filter failure. In this paper, the phenomenon of two cases of failure of manpower, specific analysis of the cause, through the analysis of two typical faults, to improve the filter in a large device and other equipment maintenance capabilities.

Urea plant in the operation of two typical faults:

Carbon dioxide compressor high pressure cylinder seal system failure

Carbon dioxide compressor is manufactured in Italy, Pignone centrifugal compressors, steam turbine-driven, four two-cylinder, one, two stage low-pressure cylinder form, directly driven by the steam turbine design speed 8400r/nfin; third and fourth composed of high-pressure cylinder, powered by low-pressure cylinder rotor to pass through the gear box growth of high-pressure cylinder rotor design speed 12300r/min; imports of gas pressure 0.2MPa, exports of gas pressure 17:6 MPa, from the synthetic boundary region of c02 removal system sent by the compressor synthetic urea urea reactor.

LP cylinder is horizontal half-profile control structure, model 2MCL527, shaft seal for the three comb labyrinth seal. High pressure cylinder head cover for the vertical structure model 2BCL306 / A, shaft seal and seal with comb combination JohnCrane28AT mechanical seal. Three sections with two seal seal plus a set of mechanical seals, four seal plus a labyrinth seal with three sets of mechanical seals. Labyrinth seal and the seal of the sealed gas asked to bond, seal gas is the export of high-pressure cylinder Siduan plate after decompression of the C02 gas, the gas through the filter filter, mechanical seals provide 28AT necessary for normal operation of the pressure and flow. Process shown in Figure 1.

Figure 1

This process is to ensure that the key to the formation of gas 28AT mechanical seal lubrication, the formation of hydrodynamic lubrication in addition to the special structure of the friction pair and a certain speed, the fluid flow, pressure, moisture, and other impurities also affect the normal mechanical seal important factor in running. 28AT features mechanical seal ring surface of the shallow groove formations of Article l2, to a certain speed, the sealing gas from the pump into the role of shallow trenches, pushing the mechanical seal ring movement to form a layer

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