Grease Separators
Grease separators to separate oil from the release of steam and safely return it to the compressor. Discharge line grease separators are installed in any system where oil return is likely to be inadequate or difficult to accomplish. They are installed in systems where the amount of oil in circulation is excessive or creates an unacceptable loss in the efficiency of the heat transfer surfaces. Based on these criteria, discharge line grease separators are recommended for use in systems:
- operating at low temperatures.
- using nonmiscible refrigerants.
- using the non-oil-return evaporators, such as flooded liquid coolers.
- using oil stains.
- with a large range of power control.
- having long suction or discharge risers.
Although correctly apply the grease separators are usually very effective in removing oil from the refrigerant vapor, they are not 100%effective. Therefore, some additional funds should also be provided for the removal of a small amount of oil that passes through a separator in other parts of the system.
Discharge line grease separators are usually attempt type.
They are built with a series of partitions, screens or perforated plates fit into the press, large-diameter pipes. Grease-Laden refrigerant vapor passes from smaller diameter discharge line separator, causing a speed die pair rapidly decrease. Oil droplets have a large turnover and, therefore, continue to move toward die partitions at high speed. Heavy drops cannot negotiate a change in the direction you want to go through the separator, they infringe on the surface of the baffles, as the steam flows through tlie spacer holes. Drops collection and runoff from the wall of the lower part of the separator and are metered back to the compressor through the float valve and the return pipe. Other design of the separator use centrifugal force, speed steam reduction and steam direction changes to capture die oil from the emission of fumes. Each of these projects is also based on the difference between die impulse oil and couples scrub liquid mixture.
When using the grease separator system, it is important that the provisions of the Convention must be done to limit the opportunity to die of liquid refrigerant passing from the separator into the crankcase of the compressor is in standby mode. The refrigerant can condense in the separator, if conditions allow it cooler than the compressor or the connection lines. This fluid increases the level in the separator and float can lead to open, passing a mixture of oil and liquid refrigerant in the compressor crankcase. To minimize vapor condensation of the refrigerant in the grease separator for out-of-cycle, it must be installed near the compressor and in a warm place. Separator must also be well insulated to reduce heat transfer to the environment during operation of the compressor in the idle mode. To further reduce the risk of flooding Carter with liquid refrigerant separator its oil drain line must be connected to the compressor suction pipe, and not die Carter. Compressor design passages will give liquid refrigerant opportunity to evaporate radier than to mix with the crankcase oil.
Oil return pipe must be installed solenoid valve, sight glass, hands expansion valve and a manual shut-off valve. Viewing the sight glass, hand throttle valve is set so that the liquid mixture from the separator flows slowly in the suction side when the compressor is operating. The solenoid interlocks widi compressor engine, starter, so that its valve port is open only (live) when the compressor is operating. This arrangement prevents liquid separator from the devastation of the compressor during off cycle, while allowing controlled runoff and evaporation of the coolant in the suction die, the compressor is running...
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Industrial