PROPANE PROCESSING IN OIL AND GAS INDUSTRY

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Chiller

As explained earlier that Propane is used as the refrigerant in chiller. Gasses from the gas/gas and gas/liquid enter into the chiller where they are passed through the tubes while propane is on shell side. Excessive drop in temperature occurs here causing heavier hydrocarbons to condense out as propane after exchanging heat vaporizes.

MYCOM Compressor

After cooling raw gas in chiller, vaporize propane from suction scrubber enters into the MYCOM compressor, which is reciprocating economized screw compressor. The suction pressure remains around 50 KPa and discharge pressure is around 55/56 KPa, which is controlled by pressure control valve (PCV). With gaseous propane lube oil also enters into the vaporize propane which act as a lubricant as well as coolant.
This mixture enters into the refrigerant/oil separator, in which lube oil is separated from gaseous propane. After this propane enters into the propane accumulator and then into the FIN fan condenser.

Fan Condenser

The gaseous propane from the accumulator is entered into the fan condenser. In this condenser Gaseous propane is in tubes which contain the fins with it, to increase the surface area for cooling. In this condenser cool air is forced to pass on to the network of fin tubes. Most of the propane recovered in liquid form in this stage but some propane still remains in gaseous form, depending upon ambient temperature.

Refrigerant Accumulator

Refrigerant accumulator is basically storage for liquid propane. The temperature in accumulator is around 35/400C and pressure is about 1500KPa. Due to this high pressure propane remains in the liquid form with some gaseous propane. The discharge from the accumulator enters into the desiccator in which propane is dried. Through second discharge it is pumped into the MYCOM compressor discharge line where it cools the out coming stream of propane and lube oil.

 U-Tube Exchanger

Liquid propane after discharging through refrigerant accumulator enters into the U-tube heat exchanger, in which it exchanges the heat with the vapors of de-ethanizer before going to Ajax compressor.
Economizer
After exchanger liquid propane enters into the economizer in which it pressure further drops, sudden drop in pressure cause cooling which is called Joule Thomson Effect. The pressure in the economizer is dropped by the liquid expansion valve. The pressure in economizer is around 370Kpa. In this stage temperature of liquid propane further drops to 40C. The gaseous propane escapes out and enters again into the MYCOM compressor.

Chiller at MOL makori Plant


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