Method for liquefying a hydrocarbon-rich fraction
A hydrocarbon-rich distillate and refrigerant technology, applied in liquefaction, refrigeration, liquefaction, solidification, etc., can solve the problems of high investment cost, energy consumption cannot be compensated, etc., achieve low equipment cost, improve overall economy, and reduce quantity Effect
Active Publication Date: 2014-11-26
LINDE AG
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Problems solved by technology
Especially in the case of smaller liquefaction productions, which are understood here as LNG productions of less than 3 million tons / year, the aforementioned process is compared to so-called SMR (single-stage mixing Refrigerant Single Mixed Refrigerant) liquefaction process has disadvantages, because the aforementioned liquefaction process results in higher investment costs, which cannot be compensated even by its lower energy consumption
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Embodiment Construction
[0020] The method for liquefying a hydrocarbon-rich fraction according to the present invention and other advantageous embodiments that are the subject of the dependent claims are explained in more detail below based on the examples shown in the drawings.
[0021] The hydrocarbon-rich fraction to be liquefied is sent to the amine scrubber A through the pipeline 1, and the hydrocarbon-rich fraction to be liquefied should be a natural gas stream below. A drying unit T is provided downstream of the amine washing device, and a heat exchanger E1 is provided upstream of the drying unit. The water contained in the natural gas is partially condensed therein to reduce the burden of the drying unit T.
[0022] The natural gas stream pretreated in this way is sent to the heat exchanger E6 through the pipe 2 and cooled in it relative to the fully evaporated refrigerant mixture of the refrigerant mixture circuit, which will still be discussed below. The heat exchanger E6 is preferably designed...
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A method for liquefying a hydrocarbon-rich fraction is described. According to the invention, the hydrocarbon-rich fraction (1, 2) is cooled (E6) and liquefied (E7) in an indirect heat exchange with the coolant mixture of a coolant mixture cycle (5-9), the hydrocarbon-rich fraction (1, 2) is cooled (E6) in an indirect heat exchange with the fully evaporated coolant mixture of the coolant mixture cycle (5-9), the compressed coolant mixture of the coolant mixture cycle (5-9) is precooled using a pure-substance refrigeration cycle (10-19), and the composition of the coolant mixture and / or the final compressor pressure of the coolant mixture cycle (5-9) is / are selected such that all of the coolant mixture is liquefied by the pure-substance refrigeration cycle (10-19).
Description
Technical field [0001] The invention relates to a method for liquefying hydrocarbon-rich fractions. Background technique [0002] US 3,763,658 discloses a method for liquefying hydrocarbon-rich fractions, and the method is especially used in natural gas liquefaction processes. Here, the refrigerant mixture circuit is used for the liquefaction and subcooling of natural gas, and a pure substance circuit is additionally provided, which pre-cools the natural gas to be liquefied and pre-cools and partially liquefies the refrigerant mixture in the refrigerant mixture circuit. This type of liquefaction method is particularly suitable for natural gas liquefaction processes with LNG production of 1 to 6 million tons / year. [0003] The natural gas to be liquefied is usually sent to the aqueous amine washing device before the actual cooling and liquefaction, and a drying unit is usually arranged downstream of it. Especially in a warm climate zone, a branch of the aforementioned pure substan...
Claims
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IPC IPC(8): F25J1/02
CPCF25J1/0265F25J1/0052F25J1/0085F25J1/0268F25J1/0215F25J1/0216F25J1/0095F25J1/0022F25J1/0087
Inventor H·鲍尔H·弗兰克
Owner LINDE AG