| 主权项 |
1. Method of treating a hydrocarbon stream comprising methane, the method comprising:
providing a wet hydrocarbon stream at a first temperature, said wet hydrocarbon stream comprising at least methane and water; cooling of the wet hydrocarbon stream thereby lowering the temperature from the first temperature to a second temperature, wherein said cooling of the wet hydrocarbon stream comprises indirectly heat exchanging against an effluent stream followed by indirectly heat exchanging against an auxiliary refrigerant stream; withdrawing from the wet hydrocarbon stream, in a water removal device at the second temperature, a wet disposal stream comprising water from the wet hydrocarbon stream and an effluent stream comprising the wet hydrocarbon stream from which the wet disposal stream has been removed; passing the effluent stream to a further heat exchanger, said passing of the effluent stream to the further heat exchanger comprising heating the effluent stream by indirectly heat exchanging against the wet hydrocarbon stream in a wet feed heat exchanger; cooling the effluent stream in the further heat exchanger by indirect heat exchanging against an evaporating refrigerant fraction; cycling a refrigerant in repetitive cycles, wherein a single pass of the refrigerant through the cycle comprises the following consecutive steps:
providing a refrigerant stream in a compressed condition;passing the refrigerant stream in said compressed condition through a condenser whereby at least partially condensing the refrigerant stream in said compressed condition, thereby forming source refrigerant stream comprising a liquid phase at a refrigerant temperature and a refrigerant pressure;obtaining the evaporating refrigerant fraction comprising expanding at least a part of a part of the source refrigerant stream to a pressure lower than the refrigerant pressure;passing the evaporating refrigerant fraction to the further heat exchanger;forming a spent refrigerant from the evaporating refrigerant fraction by absorbing heat from at least the effluent stream in the further heat exchanger;discharging said spent refrigerant from the further heat exchanger;passing said spent refrigerant to a refrigerant compressor;discharging from the refrigerant compressor said refrigerant stream in compressed condition; wherein during said single pass the cycle further comprises the following consecutive steps:
splitting the source refrigerant stream into said auxiliary refrigerant stream and said part of the source refrigerant stream wherein said auxiliary refrigerant stream comprises at least a part of said liquid phase;indirectly heat exchanging the auxiliary refrigerant stream against said wet hydrocarbon stream whereby passing heat from the wet hydrocarbon stream to the auxiliary refrigerant stream as part of said cooling of the wet hydrocarbon stream whereby discharging a discharged auxiliary refrigerant stream containing said heat from the wet hydrocarbon stream;directly heat exchanging the discharged auxiliary refrigerant stream with the spent refrigerant being passed to the refrigerant compressor;forming the refrigerant stream in compressed condition by compressing the spent refrigerant and the discharged auxiliary refrigerant stream whereby allowing said direct heat exchanging before said compressing in each single pass. |
