Oil fume emission-free oil supply device for turbo expander

Abstract

The invention discloses an oil fume emission-free oil supply device for a turbo expander. The oil supply device comprises an oil-gas separator, the oil-gas separator comprises an outer shell, an exhaust fan, an oil fume pipeline, an oil return pipeline, a motor, a fan and a filter element, wherein the motor, the fan and the filter element are arranged in the outer shell; the fan is driven by the motor to rotate and is positioned in the filter element; the motor is positioned outside the filter element; the oil fume pipeline is communicated with the interior of the filter element, and high-temperature oil fume generated by working of the turbo expander can be sucked into the filter element to be subjected to oil-gas separation through rotation of the fan; the oil return pipeline is arrangedon the outer shell and is communicated with an oil tank so as to enable the separated oil to flow back into the oil tank; oil-gas separation is achieved in the mode that the motor drives the draughtfan to rotate to generate negative pressure, oil liquid flows back into the oil tank through the oil return pipeline to be reused, and clean gas is exhausted into the atmosphere through the efficientdraught fan. The oil-gas separation effect is remarkable, and black smoke cannot be discharged, so that the environment is protected.

Description

technical field [0001] The invention relates to an oil supply device for a turbo expander without oil fume discharge. Background technique [0002] The turboexpander is the key single unit in the air separation equipment, it provides almost all the cooling capacity in the air separation equipment, its performance directly determines the energy consumption and reliability of the air separation equipment; currently in the air separation equipment, the matching Most of the turbo expanders are lubricated by oil bearings. This turbo expander has the advantages of convenient operation, stable operation, large bearing capacity, and is suitable for various operating conditions. It needs a set specially designed for bearing oil supply. The purpose of the oil supply device is to provide clean lubricating oil with a certain pressure, temperature and oil volume for the bearing. [0003] The oil supply device is generally composed of an oil pump, an oil tank, an oil inlet filter, a one-...

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Problems solved by technology

[0004] Some of the existing oil-gas separators are filled with sponge as a filter screen, but the sponge filter screen is easily blocked by moisture, resulting in poor oil-gas separation effect, and the discharged gas contains a large amount of black lubricating oil smoke, which makes the oil supply The vicinity of the device will soon turn black, seriously polluting the environment; and after the sponge is blocked, it cannot be blown off and reused after cleaning, and the cost is high; there are also methods of jet separation and stainless steel mesh filtration, such as figure 1 As shown, the oil fume enters the oil-gas separator 1 from the oil fume pipe 5, and a pressure gas with a pressure of about 2 bar is introduced from the process gas, and the pressure gas is injected into the oil fume at a high speed through the intake pipe 11 through the throttle valve. In the mixed gas, the cold air flow after injection can cool and separate the hot oily fume gas, so that the gas goes up, and the cooled liquid droplets float down. When they meet the stainless steel wire mesh with a high mesh number, they are stuck After staying, it flows down, and finally gathers to the bottom of the oil-air separator, and flows back to the oil tank through the oil return pipe 6. This type of oil-air separator is used in small turboexpanders, and the effect is not bad, and there is no obvious discharge pipe. However, if the speed is increased, or the pressure and shape of the turbo expander are slightly larger, the phenomenon of black smoke will be more obvious

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